1 /*--------------------------------------------------------------------
4 * Support for grand unified configuration scheme, including SET
5 * command, configuration file, and command line options.
6 * See src/backend/utils/misc/README for more information.
9 * Copyright (c) 2000-2013, PostgreSQL Global Development Group
10 * Written by Peter Eisentraut <peter_e@gmx.net>.
13 * src/backend/utils/misc/guc.c
15 *--------------------------------------------------------------------
29 #include "access/gin.h"
30 #include "access/transam.h"
31 #include "access/twophase.h"
32 #include "access/xact.h"
33 #include "catalog/namespace.h"
34 #include "commands/async.h"
35 #include "commands/prepare.h"
36 #include "commands/vacuum.h"
37 #include "commands/variable.h"
38 #include "commands/trigger.h"
40 #include "libpq/auth.h"
41 #include "libpq/be-fsstubs.h"
42 #include "libpq/libpq.h"
43 #include "libpq/pqformat.h"
44 #include "miscadmin.h"
45 #include "optimizer/cost.h"
46 #include "optimizer/geqo.h"
47 #include "optimizer/paths.h"
48 #include "optimizer/planmain.h"
49 #include "parser/parse_expr.h"
50 #include "parser/parse_type.h"
51 #include "parser/parser.h"
52 #include "parser/scansup.h"
54 #include "postmaster/autovacuum.h"
55 #include "postmaster/bgworker.h"
56 #include "postmaster/bgwriter.h"
57 #include "postmaster/postmaster.h"
58 #include "postmaster/syslogger.h"
59 #include "postmaster/walwriter.h"
60 #include "replication/syncrep.h"
61 #include "replication/walreceiver.h"
62 #include "replication/walsender.h"
63 #include "storage/bufmgr.h"
64 #include "storage/standby.h"
65 #include "storage/fd.h"
66 #include "storage/proc.h"
67 #include "storage/predicate.h"
68 #include "tcop/tcopprot.h"
69 #include "tsearch/ts_cache.h"
70 #include "utils/builtins.h"
71 #include "utils/bytea.h"
72 #include "utils/guc_tables.h"
73 #include "utils/memutils.h"
74 #include "utils/pg_locale.h"
75 #include "utils/plancache.h"
76 #include "utils/portal.h"
77 #include "utils/ps_status.h"
78 #include "utils/snapmgr.h"
79 #include "utils/tzparser.h"
80 #include "utils/xml.h"
83 #define PG_KRB_SRVTAB ""
86 #define PG_KRB_SRVNAM ""
89 #define CONFIG_FILENAME "postgresql.conf"
90 #define HBA_FILENAME "pg_hba.conf"
91 #define IDENT_FILENAME "pg_ident.conf"
94 #define CONFIG_EXEC_PARAMS "global/config_exec_params"
95 #define CONFIG_EXEC_PARAMS_NEW "global/config_exec_params.new"
98 /* upper limit for GUC variables measured in kilobytes of memory */
99 /* note that various places assume the byte size fits in a "long" variable */
100 #if SIZEOF_SIZE_T > 4 && SIZEOF_LONG > 4
101 #define MAX_KILOBYTES INT_MAX
103 #define MAX_KILOBYTES (INT_MAX / 1024)
106 #define KB_PER_MB (1024)
107 #define KB_PER_GB (1024*1024)
109 #define MS_PER_S 1000
111 #define MS_PER_MIN (1000 * 60)
113 #define S_PER_H (60 * 60)
114 #define MS_PER_H (1000 * 60 * 60)
115 #define MIN_PER_D (60 * 24)
116 #define S_PER_D (60 * 60 * 24)
117 #define MS_PER_D (1000 * 60 * 60 * 24)
119 /* XXX these should appear in other modules' header files */
120 extern bool Log_disconnections;
121 extern int CommitDelay;
122 extern int CommitSiblings;
123 extern char *default_tablespace;
124 extern char *temp_tablespaces;
125 extern bool synchronize_seqscans;
126 extern int ssl_renegotiation_limit;
127 extern char *SSLCipherSuites;
130 extern bool trace_sort;
132 #ifdef TRACE_SYNCSCAN
133 extern bool trace_syncscan;
135 #ifdef DEBUG_BOUNDED_SORT
136 extern bool optimize_bounded_sort;
139 static int GUC_check_errcode_value;
141 /* global variables for check hook support */
142 char *GUC_check_errmsg_string;
143 char *GUC_check_errdetail_string;
144 char *GUC_check_errhint_string;
147 static void set_config_sourcefile(const char *name, char *sourcefile,
149 static bool call_bool_check_hook(struct config_bool * conf, bool *newval,
150 void **extra, GucSource source, int elevel);
151 static bool call_int_check_hook(struct config_int * conf, int *newval,
152 void **extra, GucSource source, int elevel);
153 static bool call_real_check_hook(struct config_real * conf, double *newval,
154 void **extra, GucSource source, int elevel);
155 static bool call_string_check_hook(struct config_string * conf, char **newval,
156 void **extra, GucSource source, int elevel);
157 static bool call_enum_check_hook(struct config_enum * conf, int *newval,
158 void **extra, GucSource source, int elevel);
160 static bool check_log_destination(char **newval, void **extra, GucSource source);
161 static void assign_log_destination(const char *newval, void *extra);
164 static int syslog_facility = LOG_LOCAL0;
166 static int syslog_facility = 0;
169 static void assign_syslog_facility(int newval, void *extra);
170 static void assign_syslog_ident(const char *newval, void *extra);
171 static void assign_session_replication_role(int newval, void *extra);
172 static bool check_temp_buffers(int *newval, void **extra, GucSource source);
173 static bool check_phony_autocommit(bool *newval, void **extra, GucSource source);
174 static bool check_debug_assertions(bool *newval, void **extra, GucSource source);
175 static bool check_bonjour(bool *newval, void **extra, GucSource source);
176 static bool check_ssl(bool *newval, void **extra, GucSource source);
177 static bool check_stage_log_stats(bool *newval, void **extra, GucSource source);
178 static bool check_log_stats(bool *newval, void **extra, GucSource source);
179 static bool check_canonical_path(char **newval, void **extra, GucSource source);
180 static bool check_timezone_abbreviations(char **newval, void **extra, GucSource source);
181 static void assign_timezone_abbreviations(const char *newval, void *extra);
182 static void pg_timezone_abbrev_initialize(void);
183 static const char *show_archive_command(void);
184 static void assign_tcp_keepalives_idle(int newval, void *extra);
185 static void assign_tcp_keepalives_interval(int newval, void *extra);
186 static void assign_tcp_keepalives_count(int newval, void *extra);
187 static const char *show_tcp_keepalives_idle(void);
188 static const char *show_tcp_keepalives_interval(void);
189 static const char *show_tcp_keepalives_count(void);
190 static bool check_maxconnections(int *newval, void **extra, GucSource source);
191 static bool check_autovacuum_max_workers(int *newval, void **extra, GucSource source);
192 static bool check_effective_io_concurrency(int *newval, void **extra, GucSource source);
193 static void assign_effective_io_concurrency(int newval, void *extra);
194 static void assign_pgstat_temp_directory(const char *newval, void *extra);
195 static bool check_application_name(char **newval, void **extra, GucSource source);
196 static void assign_application_name(const char *newval, void *extra);
197 static const char *show_unix_socket_permissions(void);
198 static const char *show_log_file_mode(void);
200 static char *config_enum_get_options(struct config_enum * record,
201 const char *prefix, const char *suffix,
202 const char *separator);
206 * Options for enum values defined in this module.
208 * NOTE! Option values may not contain double quotes!
211 static const struct config_enum_entry bytea_output_options[] = {
212 {"escape", BYTEA_OUTPUT_ESCAPE, false},
213 {"hex", BYTEA_OUTPUT_HEX, false},
218 * We have different sets for client and server message level options because
219 * they sort slightly different (see "log" level)
221 static const struct config_enum_entry client_message_level_options[] = {
222 {"debug", DEBUG2, true},
223 {"debug5", DEBUG5, false},
224 {"debug4", DEBUG4, false},
225 {"debug3", DEBUG3, false},
226 {"debug2", DEBUG2, false},
227 {"debug1", DEBUG1, false},
229 {"info", INFO, true},
230 {"notice", NOTICE, false},
231 {"warning", WARNING, false},
232 {"error", ERROR, false},
233 {"fatal", FATAL, true},
234 {"panic", PANIC, true},
238 static const struct config_enum_entry server_message_level_options[] = {
239 {"debug", DEBUG2, true},
240 {"debug5", DEBUG5, false},
241 {"debug4", DEBUG4, false},
242 {"debug3", DEBUG3, false},
243 {"debug2", DEBUG2, false},
244 {"debug1", DEBUG1, false},
245 {"info", INFO, false},
246 {"notice", NOTICE, false},
247 {"warning", WARNING, false},
248 {"error", ERROR, false},
250 {"fatal", FATAL, false},
251 {"panic", PANIC, false},
255 static const struct config_enum_entry intervalstyle_options[] = {
256 {"postgres", INTSTYLE_POSTGRES, false},
257 {"postgres_verbose", INTSTYLE_POSTGRES_VERBOSE, false},
258 {"sql_standard", INTSTYLE_SQL_STANDARD, false},
259 {"iso_8601", INTSTYLE_ISO_8601, false},
263 static const struct config_enum_entry log_error_verbosity_options[] = {
264 {"terse", PGERROR_TERSE, false},
265 {"default", PGERROR_DEFAULT, false},
266 {"verbose", PGERROR_VERBOSE, false},
270 static const struct config_enum_entry log_statement_options[] = {
271 {"none", LOGSTMT_NONE, false},
272 {"ddl", LOGSTMT_DDL, false},
273 {"mod", LOGSTMT_MOD, false},
274 {"all", LOGSTMT_ALL, false},
278 static const struct config_enum_entry isolation_level_options[] = {
279 {"serializable", XACT_SERIALIZABLE, false},
280 {"repeatable read", XACT_REPEATABLE_READ, false},
281 {"read committed", XACT_READ_COMMITTED, false},
282 {"read uncommitted", XACT_READ_UNCOMMITTED, false},
286 static const struct config_enum_entry session_replication_role_options[] = {
287 {"origin", SESSION_REPLICATION_ROLE_ORIGIN, false},
288 {"replica", SESSION_REPLICATION_ROLE_REPLICA, false},
289 {"local", SESSION_REPLICATION_ROLE_LOCAL, false},
293 static const struct config_enum_entry syslog_facility_options[] = {
295 {"local0", LOG_LOCAL0, false},
296 {"local1", LOG_LOCAL1, false},
297 {"local2", LOG_LOCAL2, false},
298 {"local3", LOG_LOCAL3, false},
299 {"local4", LOG_LOCAL4, false},
300 {"local5", LOG_LOCAL5, false},
301 {"local6", LOG_LOCAL6, false},
302 {"local7", LOG_LOCAL7, false},
309 static const struct config_enum_entry track_function_options[] = {
310 {"none", TRACK_FUNC_OFF, false},
311 {"pl", TRACK_FUNC_PL, false},
312 {"all", TRACK_FUNC_ALL, false},
316 static const struct config_enum_entry xmlbinary_options[] = {
317 {"base64", XMLBINARY_BASE64, false},
318 {"hex", XMLBINARY_HEX, false},
322 static const struct config_enum_entry xmloption_options[] = {
323 {"content", XMLOPTION_CONTENT, false},
324 {"document", XMLOPTION_DOCUMENT, false},
329 * Although only "on", "off", and "safe_encoding" are documented, we
330 * accept all the likely variants of "on" and "off".
332 static const struct config_enum_entry backslash_quote_options[] = {
333 {"safe_encoding", BACKSLASH_QUOTE_SAFE_ENCODING, false},
334 {"on", BACKSLASH_QUOTE_ON, false},
335 {"off", BACKSLASH_QUOTE_OFF, false},
336 {"true", BACKSLASH_QUOTE_ON, true},
337 {"false", BACKSLASH_QUOTE_OFF, true},
338 {"yes", BACKSLASH_QUOTE_ON, true},
339 {"no", BACKSLASH_QUOTE_OFF, true},
340 {"1", BACKSLASH_QUOTE_ON, true},
341 {"0", BACKSLASH_QUOTE_OFF, true},
346 * Although only "on", "off", and "partition" are documented, we
347 * accept all the likely variants of "on" and "off".
349 static const struct config_enum_entry constraint_exclusion_options[] = {
350 {"partition", CONSTRAINT_EXCLUSION_PARTITION, false},
351 {"on", CONSTRAINT_EXCLUSION_ON, false},
352 {"off", CONSTRAINT_EXCLUSION_OFF, false},
353 {"true", CONSTRAINT_EXCLUSION_ON, true},
354 {"false", CONSTRAINT_EXCLUSION_OFF, true},
355 {"yes", CONSTRAINT_EXCLUSION_ON, true},
356 {"no", CONSTRAINT_EXCLUSION_OFF, true},
357 {"1", CONSTRAINT_EXCLUSION_ON, true},
358 {"0", CONSTRAINT_EXCLUSION_OFF, true},
363 * Although only "on", "off", "remote_write", and "local" are documented, we
364 * accept all the likely variants of "on" and "off".
366 static const struct config_enum_entry synchronous_commit_options[] = {
367 {"local", SYNCHRONOUS_COMMIT_LOCAL_FLUSH, false},
368 {"remote_write", SYNCHRONOUS_COMMIT_REMOTE_WRITE, false},
369 {"on", SYNCHRONOUS_COMMIT_ON, false},
370 {"off", SYNCHRONOUS_COMMIT_OFF, false},
371 {"true", SYNCHRONOUS_COMMIT_ON, true},
372 {"false", SYNCHRONOUS_COMMIT_OFF, true},
373 {"yes", SYNCHRONOUS_COMMIT_ON, true},
374 {"no", SYNCHRONOUS_COMMIT_OFF, true},
375 {"1", SYNCHRONOUS_COMMIT_ON, true},
376 {"0", SYNCHRONOUS_COMMIT_OFF, true},
381 * Options for enum values stored in other modules
383 extern const struct config_enum_entry wal_level_options[];
384 extern const struct config_enum_entry sync_method_options[];
387 * GUC option variables that are exported from this module
389 #ifdef USE_ASSERT_CHECKING
390 bool assert_enabled = true;
392 bool assert_enabled = false;
394 bool log_duration = false;
395 bool Debug_print_plan = false;
396 bool Debug_print_parse = false;
397 bool Debug_print_rewritten = false;
398 bool Debug_pretty_print = true;
400 bool log_parser_stats = false;
401 bool log_planner_stats = false;
402 bool log_executor_stats = false;
403 bool log_statement_stats = false; /* this is sort of all three
405 bool log_btree_build_stats = false;
408 bool check_function_bodies = true;
409 bool default_with_oids = false;
410 bool SQL_inheritance = true;
412 bool Password_encryption = true;
414 int log_min_error_statement = ERROR;
415 int log_min_messages = WARNING;
416 int client_min_messages = NOTICE;
417 int log_min_duration_statement = -1;
418 int log_temp_files = -1;
419 int trace_recovery_messages = LOG;
421 int temp_file_limit = -1;
423 int num_temp_buffers = 1024;
425 char *data_directory;
426 char *ConfigFileName;
429 char *external_pid_file;
431 char *pgstat_temp_directory;
433 char *application_name;
435 int tcp_keepalives_idle;
436 int tcp_keepalives_interval;
437 int tcp_keepalives_count;
440 * These variables are all dummies that don't do anything, except in some
441 * cases provide the value for SHOW to display. The real state is elsewhere
442 * and is kept in sync by assign_hooks.
444 static char *log_destination_string;
446 static char *syslog_ident_str;
447 static bool phony_autocommit;
448 static bool session_auth_is_superuser;
449 static double phony_random_seed;
450 static char *client_encoding_string;
451 static char *datestyle_string;
452 static char *locale_collate;
453 static char *locale_ctype;
454 static char *server_encoding_string;
455 static char *server_version_string;
456 static int server_version_num;
457 static char *timezone_string;
458 static char *log_timezone_string;
459 static char *timezone_abbreviations_string;
460 static char *XactIsoLevel_string;
461 static char *session_authorization_string;
462 static int max_function_args;
463 static int max_index_keys;
464 static int max_identifier_length;
465 static int block_size;
466 static int segment_size;
467 static int wal_block_size;
468 static int wal_segment_size;
469 static bool integer_datetimes;
470 static int effective_io_concurrency;
472 /* should be static, but commands/variable.c needs to get at this */
477 * Displayable names for context types (enum GucContext)
479 * Note: these strings are deliberately not localized.
481 const char *const GucContext_Names[] =
483 /* PGC_INTERNAL */ "internal",
484 /* PGC_POSTMASTER */ "postmaster",
485 /* PGC_SIGHUP */ "sighup",
486 /* PGC_BACKEND */ "backend",
487 /* PGC_SUSET */ "superuser",
488 /* PGC_USERSET */ "user"
492 * Displayable names for source types (enum GucSource)
494 * Note: these strings are deliberately not localized.
496 const char *const GucSource_Names[] =
498 /* PGC_S_DEFAULT */ "default",
499 /* PGC_S_DYNAMIC_DEFAULT */ "default",
500 /* PGC_S_ENV_VAR */ "environment variable",
501 /* PGC_S_FILE */ "configuration file",
502 /* PGC_S_ARGV */ "command line",
503 /* PGC_S_GLOBAL */ "global",
504 /* PGC_S_DATABASE */ "database",
505 /* PGC_S_USER */ "user",
506 /* PGC_S_DATABASE_USER */ "database user",
507 /* PGC_S_CLIENT */ "client",
508 /* PGC_S_OVERRIDE */ "override",
509 /* PGC_S_INTERACTIVE */ "interactive",
510 /* PGC_S_TEST */ "test",
511 /* PGC_S_SESSION */ "session"
515 * Displayable names for the groupings defined in enum config_group
517 const char *const config_group_names[] =
520 gettext_noop("Ungrouped"),
522 gettext_noop("File Locations"),
524 gettext_noop("Connections and Authentication"),
525 /* CONN_AUTH_SETTINGS */
526 gettext_noop("Connections and Authentication / Connection Settings"),
527 /* CONN_AUTH_SECURITY */
528 gettext_noop("Connections and Authentication / Security and Authentication"),
530 gettext_noop("Resource Usage"),
532 gettext_noop("Resource Usage / Memory"),
534 gettext_noop("Resource Usage / Disk"),
535 /* RESOURCES_KERNEL */
536 gettext_noop("Resource Usage / Kernel Resources"),
537 /* RESOURCES_VACUUM_DELAY */
538 gettext_noop("Resource Usage / Cost-Based Vacuum Delay"),
539 /* RESOURCES_BGWRITER */
540 gettext_noop("Resource Usage / Background Writer"),
541 /* RESOURCES_ASYNCHRONOUS */
542 gettext_noop("Resource Usage / Asynchronous Behavior"),
544 gettext_noop("Write-Ahead Log"),
546 gettext_noop("Write-Ahead Log / Settings"),
547 /* WAL_CHECKPOINTS */
548 gettext_noop("Write-Ahead Log / Checkpoints"),
550 gettext_noop("Write-Ahead Log / Archiving"),
552 gettext_noop("Replication"),
553 /* REPLICATION_SENDING */
554 gettext_noop("Replication / Sending Servers"),
555 /* REPLICATION_MASTER */
556 gettext_noop("Replication / Master Server"),
557 /* REPLICATION_STANDBY */
558 gettext_noop("Replication / Standby Servers"),
560 gettext_noop("Query Tuning"),
561 /* QUERY_TUNING_METHOD */
562 gettext_noop("Query Tuning / Planner Method Configuration"),
563 /* QUERY_TUNING_COST */
564 gettext_noop("Query Tuning / Planner Cost Constants"),
565 /* QUERY_TUNING_GEQO */
566 gettext_noop("Query Tuning / Genetic Query Optimizer"),
567 /* QUERY_TUNING_OTHER */
568 gettext_noop("Query Tuning / Other Planner Options"),
570 gettext_noop("Reporting and Logging"),
572 gettext_noop("Reporting and Logging / Where to Log"),
574 gettext_noop("Reporting and Logging / When to Log"),
576 gettext_noop("Reporting and Logging / What to Log"),
578 gettext_noop("Statistics"),
579 /* STATS_MONITORING */
580 gettext_noop("Statistics / Monitoring"),
581 /* STATS_COLLECTOR */
582 gettext_noop("Statistics / Query and Index Statistics Collector"),
584 gettext_noop("Autovacuum"),
586 gettext_noop("Client Connection Defaults"),
587 /* CLIENT_CONN_STATEMENT */
588 gettext_noop("Client Connection Defaults / Statement Behavior"),
589 /* CLIENT_CONN_LOCALE */
590 gettext_noop("Client Connection Defaults / Locale and Formatting"),
591 /* CLIENT_CONN_OTHER */
592 gettext_noop("Client Connection Defaults / Other Defaults"),
593 /* LOCK_MANAGEMENT */
594 gettext_noop("Lock Management"),
596 gettext_noop("Version and Platform Compatibility"),
597 /* COMPAT_OPTIONS_PREVIOUS */
598 gettext_noop("Version and Platform Compatibility / Previous PostgreSQL Versions"),
599 /* COMPAT_OPTIONS_CLIENT */
600 gettext_noop("Version and Platform Compatibility / Other Platforms and Clients"),
602 gettext_noop("Error Handling"),
604 gettext_noop("Preset Options"),
606 gettext_noop("Customized Options"),
607 /* DEVELOPER_OPTIONS */
608 gettext_noop("Developer Options"),
609 /* help_config wants this array to be null-terminated */
614 * Displayable names for GUC variable types (enum config_type)
616 * Note: these strings are deliberately not localized.
618 const char *const config_type_names[] =
620 /* PGC_BOOL */ "bool",
621 /* PGC_INT */ "integer",
622 /* PGC_REAL */ "real",
623 /* PGC_STRING */ "string",
624 /* PGC_ENUM */ "enum"
629 * Contents of GUC tables
631 * See src/backend/utils/misc/README for design notes.
635 * 1. Declare a global variable of type bool, int, double, or char*
636 * and make use of it.
638 * 2. Decide at what times it's safe to set the option. See guc.h for
641 * 3. Decide on a name, a default value, upper and lower bounds (if
644 * 4. Add a record below.
646 * 5. Add it to src/backend/utils/misc/postgresql.conf.sample, if
649 * 6. Don't forget to document the option (at least in config.sgml).
651 * 7. If it's a new GUC_LIST option you must edit pg_dumpall.c to ensure
652 * it is not single quoted at dump time.
656 /******** option records follow ********/
658 static struct config_bool ConfigureNamesBool[] =
661 {"enable_seqscan", PGC_USERSET, QUERY_TUNING_METHOD,
662 gettext_noop("Enables the planner's use of sequential-scan plans."),
670 {"enable_indexscan", PGC_USERSET, QUERY_TUNING_METHOD,
671 gettext_noop("Enables the planner's use of index-scan plans."),
679 {"enable_indexonlyscan", PGC_USERSET, QUERY_TUNING_METHOD,
680 gettext_noop("Enables the planner's use of index-only-scan plans."),
683 &enable_indexonlyscan,
688 {"enable_bitmapscan", PGC_USERSET, QUERY_TUNING_METHOD,
689 gettext_noop("Enables the planner's use of bitmap-scan plans."),
697 {"enable_tidscan", PGC_USERSET, QUERY_TUNING_METHOD,
698 gettext_noop("Enables the planner's use of TID scan plans."),
706 {"enable_sort", PGC_USERSET, QUERY_TUNING_METHOD,
707 gettext_noop("Enables the planner's use of explicit sort steps."),
715 {"enable_hashagg", PGC_USERSET, QUERY_TUNING_METHOD,
716 gettext_noop("Enables the planner's use of hashed aggregation plans."),
724 {"enable_material", PGC_USERSET, QUERY_TUNING_METHOD,
725 gettext_noop("Enables the planner's use of materialization."),
733 {"enable_nestloop", PGC_USERSET, QUERY_TUNING_METHOD,
734 gettext_noop("Enables the planner's use of nested-loop join plans."),
742 {"enable_mergejoin", PGC_USERSET, QUERY_TUNING_METHOD,
743 gettext_noop("Enables the planner's use of merge join plans."),
751 {"enable_hashjoin", PGC_USERSET, QUERY_TUNING_METHOD,
752 gettext_noop("Enables the planner's use of hash join plans."),
760 {"geqo", PGC_USERSET, QUERY_TUNING_GEQO,
761 gettext_noop("Enables genetic query optimization."),
762 gettext_noop("This algorithm attempts to do planning without "
763 "exhaustive searching.")
770 /* Not for general use --- used by SET SESSION AUTHORIZATION */
771 {"is_superuser", PGC_INTERNAL, UNGROUPED,
772 gettext_noop("Shows whether the current user is a superuser."),
774 GUC_REPORT | GUC_NO_SHOW_ALL | GUC_NO_RESET_ALL | GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
776 &session_auth_is_superuser,
781 {"bonjour", PGC_POSTMASTER, CONN_AUTH_SETTINGS,
782 gettext_noop("Enables advertising the server via Bonjour."),
787 check_bonjour, NULL, NULL
790 {"ssl", PGC_POSTMASTER, CONN_AUTH_SECURITY,
791 gettext_noop("Enables SSL connections."),
796 check_ssl, NULL, NULL
799 {"fsync", PGC_SIGHUP, WAL_SETTINGS,
800 gettext_noop("Forces synchronization of updates to disk."),
801 gettext_noop("The server will use the fsync() system call in several places to make "
802 "sure that updates are physically written to disk. This insures "
803 "that a database cluster will recover to a consistent state after "
804 "an operating system or hardware crash.")
811 {"zero_damaged_pages", PGC_SUSET, DEVELOPER_OPTIONS,
812 gettext_noop("Continues processing past damaged page headers."),
813 gettext_noop("Detection of a damaged page header normally causes PostgreSQL to "
814 "report an error, aborting the current transaction. Setting "
815 "zero_damaged_pages to true causes the system to instead report a "
816 "warning, zero out the damaged page, and continue processing. This "
817 "behavior will destroy data, namely all the rows on the damaged page."),
825 {"full_page_writes", PGC_SIGHUP, WAL_SETTINGS,
826 gettext_noop("Writes full pages to WAL when first modified after a checkpoint."),
827 gettext_noop("A page write in process during an operating system crash might be "
828 "only partially written to disk. During recovery, the row changes "
829 "stored in WAL are not enough to recover. This option writes "
830 "pages when first modified after a checkpoint to WAL so full recovery "
838 {"log_checkpoints", PGC_SIGHUP, LOGGING_WHAT,
839 gettext_noop("Logs each checkpoint."),
847 {"log_connections", PGC_BACKEND, LOGGING_WHAT,
848 gettext_noop("Logs each successful connection."),
856 {"log_disconnections", PGC_BACKEND, LOGGING_WHAT,
857 gettext_noop("Logs end of a session, including duration."),
865 {"debug_assertions", PGC_USERSET, DEVELOPER_OPTIONS,
866 gettext_noop("Turns on various assertion checks."),
867 gettext_noop("This is a debugging aid."),
871 #ifdef USE_ASSERT_CHECKING
876 check_debug_assertions, NULL, NULL
880 {"exit_on_error", PGC_USERSET, ERROR_HANDLING_OPTIONS,
881 gettext_noop("Terminate session on any error."),
889 {"restart_after_crash", PGC_SIGHUP, ERROR_HANDLING_OPTIONS,
890 gettext_noop("Reinitialize server after backend crash."),
893 &restart_after_crash,
899 {"log_duration", PGC_SUSET, LOGGING_WHAT,
900 gettext_noop("Logs the duration of each completed SQL statement."),
908 {"debug_print_parse", PGC_USERSET, LOGGING_WHAT,
909 gettext_noop("Logs each query's parse tree."),
917 {"debug_print_rewritten", PGC_USERSET, LOGGING_WHAT,
918 gettext_noop("Logs each query's rewritten parse tree."),
921 &Debug_print_rewritten,
926 {"debug_print_plan", PGC_USERSET, LOGGING_WHAT,
927 gettext_noop("Logs each query's execution plan."),
935 {"debug_pretty_print", PGC_USERSET, LOGGING_WHAT,
936 gettext_noop("Indents parse and plan tree displays."),
944 {"log_parser_stats", PGC_SUSET, STATS_MONITORING,
945 gettext_noop("Writes parser performance statistics to the server log."),
950 check_stage_log_stats, NULL, NULL
953 {"log_planner_stats", PGC_SUSET, STATS_MONITORING,
954 gettext_noop("Writes planner performance statistics to the server log."),
959 check_stage_log_stats, NULL, NULL
962 {"log_executor_stats", PGC_SUSET, STATS_MONITORING,
963 gettext_noop("Writes executor performance statistics to the server log."),
968 check_stage_log_stats, NULL, NULL
971 {"log_statement_stats", PGC_SUSET, STATS_MONITORING,
972 gettext_noop("Writes cumulative performance statistics to the server log."),
975 &log_statement_stats,
977 check_log_stats, NULL, NULL
979 #ifdef BTREE_BUILD_STATS
981 {"log_btree_build_stats", PGC_SUSET, DEVELOPER_OPTIONS,
982 gettext_noop("No description available."),
986 &log_btree_build_stats,
993 {"track_activities", PGC_SUSET, STATS_COLLECTOR,
994 gettext_noop("Collects information about executing commands."),
995 gettext_noop("Enables the collection of information on the currently "
996 "executing command of each session, along with "
997 "the time at which that command began execution.")
999 &pgstat_track_activities,
1004 {"track_counts", PGC_SUSET, STATS_COLLECTOR,
1005 gettext_noop("Collects statistics on database activity."),
1008 &pgstat_track_counts,
1013 {"track_io_timing", PGC_SUSET, STATS_COLLECTOR,
1014 gettext_noop("Collects timing statistics for database I/O activity."),
1023 {"update_process_title", PGC_SUSET, STATS_COLLECTOR,
1024 gettext_noop("Updates the process title to show the active SQL command."),
1025 gettext_noop("Enables updating of the process title every time a new SQL command is received by the server.")
1027 &update_process_title,
1033 {"autovacuum", PGC_SIGHUP, AUTOVACUUM,
1034 gettext_noop("Starts the autovacuum subprocess."),
1037 &autovacuum_start_daemon,
1043 {"trace_notify", PGC_USERSET, DEVELOPER_OPTIONS,
1044 gettext_noop("Generates debugging output for LISTEN and NOTIFY."),
1055 {"trace_locks", PGC_SUSET, DEVELOPER_OPTIONS,
1056 gettext_noop("No description available."),
1065 {"trace_userlocks", PGC_SUSET, DEVELOPER_OPTIONS,
1066 gettext_noop("No description available."),
1075 {"trace_lwlocks", PGC_SUSET, DEVELOPER_OPTIONS,
1076 gettext_noop("No description available."),
1085 {"debug_deadlocks", PGC_SUSET, DEVELOPER_OPTIONS,
1086 gettext_noop("No description available."),
1097 {"log_lock_waits", PGC_SUSET, LOGGING_WHAT,
1098 gettext_noop("Logs long lock waits."),
1107 {"log_hostname", PGC_SIGHUP, LOGGING_WHAT,
1108 gettext_noop("Logs the host name in the connection logs."),
1109 gettext_noop("By default, connection logs only show the IP address "
1110 "of the connecting host. If you want them to show the host name you "
1111 "can turn this on, but depending on your host name resolution "
1112 "setup it might impose a non-negligible performance penalty.")
1119 {"sql_inheritance", PGC_USERSET, COMPAT_OPTIONS_PREVIOUS,
1120 gettext_noop("Causes subtables to be included by default in various commands."),
1128 {"password_encryption", PGC_USERSET, CONN_AUTH_SECURITY,
1129 gettext_noop("Encrypt passwords."),
1130 gettext_noop("When a password is specified in CREATE USER or "
1131 "ALTER USER without writing either ENCRYPTED or UNENCRYPTED, "
1132 "this parameter determines whether the password is to be encrypted.")
1134 &Password_encryption,
1139 {"transform_null_equals", PGC_USERSET, COMPAT_OPTIONS_CLIENT,
1140 gettext_noop("Treats \"expr=NULL\" as \"expr IS NULL\"."),
1141 gettext_noop("When turned on, expressions of the form expr = NULL "
1142 "(or NULL = expr) are treated as expr IS NULL, that is, they "
1143 "return true if expr evaluates to the null value, and false "
1144 "otherwise. The correct behavior of expr = NULL is to always "
1145 "return null (unknown).")
1147 &Transform_null_equals,
1152 {"db_user_namespace", PGC_SIGHUP, CONN_AUTH_SECURITY,
1153 gettext_noop("Enables per-database user names."),
1161 /* only here for backwards compatibility */
1162 {"autocommit", PGC_USERSET, CLIENT_CONN_STATEMENT,
1163 gettext_noop("This parameter doesn't do anything."),
1164 gettext_noop("It's just here so that we won't choke on SET AUTOCOMMIT TO ON from 7.3-vintage clients."),
1165 GUC_NO_SHOW_ALL | GUC_NOT_IN_SAMPLE
1169 check_phony_autocommit, NULL, NULL
1172 {"default_transaction_read_only", PGC_USERSET, CLIENT_CONN_STATEMENT,
1173 gettext_noop("Sets the default read-only status of new transactions."),
1176 &DefaultXactReadOnly,
1181 {"transaction_read_only", PGC_USERSET, CLIENT_CONN_STATEMENT,
1182 gettext_noop("Sets the current transaction's read-only status."),
1184 GUC_NO_RESET_ALL | GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
1188 check_transaction_read_only, NULL, NULL
1191 {"default_transaction_deferrable", PGC_USERSET, CLIENT_CONN_STATEMENT,
1192 gettext_noop("Sets the default deferrable status of new transactions."),
1195 &DefaultXactDeferrable,
1200 {"transaction_deferrable", PGC_USERSET, CLIENT_CONN_STATEMENT,
1201 gettext_noop("Whether to defer a read-only serializable transaction until it can be executed with no possible serialization failures."),
1203 GUC_NO_RESET_ALL | GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
1207 check_transaction_deferrable, NULL, NULL
1210 {"check_function_bodies", PGC_USERSET, CLIENT_CONN_STATEMENT,
1211 gettext_noop("Check function bodies during CREATE FUNCTION."),
1214 &check_function_bodies,
1219 {"array_nulls", PGC_USERSET, COMPAT_OPTIONS_PREVIOUS,
1220 gettext_noop("Enable input of NULL elements in arrays."),
1221 gettext_noop("When turned on, unquoted NULL in an array input "
1222 "value means a null value; "
1223 "otherwise it is taken literally.")
1230 {"default_with_oids", PGC_USERSET, COMPAT_OPTIONS_PREVIOUS,
1231 gettext_noop("Create new tables with OIDs by default."),
1239 {"logging_collector", PGC_POSTMASTER, LOGGING_WHERE,
1240 gettext_noop("Start a subprocess to capture stderr output and/or csvlogs into log files."),
1248 {"log_truncate_on_rotation", PGC_SIGHUP, LOGGING_WHERE,
1249 gettext_noop("Truncate existing log files of same name during log rotation."),
1252 &Log_truncate_on_rotation,
1259 {"trace_sort", PGC_USERSET, DEVELOPER_OPTIONS,
1260 gettext_noop("Emit information about resource usage in sorting."),
1270 #ifdef TRACE_SYNCSCAN
1271 /* this is undocumented because not exposed in a standard build */
1273 {"trace_syncscan", PGC_USERSET, DEVELOPER_OPTIONS,
1274 gettext_noop("Generate debugging output for synchronized scanning."),
1284 #ifdef DEBUG_BOUNDED_SORT
1285 /* this is undocumented because not exposed in a standard build */
1288 "optimize_bounded_sort", PGC_USERSET, QUERY_TUNING_METHOD,
1289 gettext_noop("Enable bounded sorting using heap sort."),
1293 &optimize_bounded_sort,
1301 {"wal_debug", PGC_SUSET, DEVELOPER_OPTIONS,
1302 gettext_noop("Emit WAL-related debugging output."),
1313 {"integer_datetimes", PGC_INTERNAL, PRESET_OPTIONS,
1314 gettext_noop("Datetimes are integer based."),
1316 GUC_REPORT | GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
1319 #ifdef HAVE_INT64_TIMESTAMP
1328 {"krb_caseins_users", PGC_SIGHUP, CONN_AUTH_SECURITY,
1329 gettext_noop("Sets whether Kerberos and GSSAPI user names should be treated as case-insensitive."),
1332 &pg_krb_caseins_users,
1338 {"escape_string_warning", PGC_USERSET, COMPAT_OPTIONS_PREVIOUS,
1339 gettext_noop("Warn about backslash escapes in ordinary string literals."),
1342 &escape_string_warning,
1348 {"standard_conforming_strings", PGC_USERSET, COMPAT_OPTIONS_PREVIOUS,
1349 gettext_noop("Causes '...' strings to treat backslashes literally."),
1353 &standard_conforming_strings,
1359 {"synchronize_seqscans", PGC_USERSET, COMPAT_OPTIONS_PREVIOUS,
1360 gettext_noop("Enable synchronized sequential scans."),
1363 &synchronize_seqscans,
1369 {"archive_mode", PGC_POSTMASTER, WAL_ARCHIVING,
1370 gettext_noop("Allows archiving of WAL files using archive_command."),
1379 {"hot_standby", PGC_POSTMASTER, REPLICATION_STANDBY,
1380 gettext_noop("Allows connections and queries during recovery."),
1389 {"hot_standby_feedback", PGC_SIGHUP, REPLICATION_STANDBY,
1390 gettext_noop("Allows feedback from a hot standby to the primary that will avoid query conflicts."),
1393 &hot_standby_feedback,
1399 {"allow_system_table_mods", PGC_POSTMASTER, DEVELOPER_OPTIONS,
1400 gettext_noop("Allows modifications of the structure of system tables."),
1404 &allowSystemTableMods,
1410 {"ignore_system_indexes", PGC_BACKEND, DEVELOPER_OPTIONS,
1411 gettext_noop("Disables reading from system indexes."),
1412 gettext_noop("It does not prevent updating the indexes, so it is safe "
1413 "to use. The worst consequence is slowness."),
1416 &IgnoreSystemIndexes,
1422 {"lo_compat_privileges", PGC_SUSET, COMPAT_OPTIONS_PREVIOUS,
1423 gettext_noop("Enables backward compatibility mode for privilege checks on large objects."),
1424 gettext_noop("Skips privilege checks when reading or modifying large objects, "
1425 "for compatibility with PostgreSQL releases prior to 9.0.")
1427 &lo_compat_privileges,
1433 {"quote_all_identifiers", PGC_USERSET, COMPAT_OPTIONS_PREVIOUS,
1434 gettext_noop("When generating SQL fragments, quote all identifiers."),
1437 "e_all_identifiers,
1442 /* End-of-list marker */
1444 {NULL, 0, 0, NULL, NULL}, NULL, false, NULL, NULL, NULL
1449 static struct config_int ConfigureNamesInt[] =
1452 {"archive_timeout", PGC_SIGHUP, WAL_ARCHIVING,
1453 gettext_noop("Forces a switch to the next xlog file if a "
1454 "new file has not been started within N seconds."),
1458 &XLogArchiveTimeout,
1463 {"post_auth_delay", PGC_BACKEND, DEVELOPER_OPTIONS,
1464 gettext_noop("Waits N seconds on connection startup after authentication."),
1465 gettext_noop("This allows attaching a debugger to the process."),
1466 GUC_NOT_IN_SAMPLE | GUC_UNIT_S
1469 0, 0, INT_MAX / 1000000,
1473 {"default_statistics_target", PGC_USERSET, QUERY_TUNING_OTHER,
1474 gettext_noop("Sets the default statistics target."),
1475 gettext_noop("This applies to table columns that have not had a "
1476 "column-specific target set via ALTER TABLE SET STATISTICS.")
1478 &default_statistics_target,
1483 {"from_collapse_limit", PGC_USERSET, QUERY_TUNING_OTHER,
1484 gettext_noop("Sets the FROM-list size beyond which subqueries "
1485 "are not collapsed."),
1486 gettext_noop("The planner will merge subqueries into upper "
1487 "queries if the resulting FROM list would have no more than "
1490 &from_collapse_limit,
1495 {"join_collapse_limit", PGC_USERSET, QUERY_TUNING_OTHER,
1496 gettext_noop("Sets the FROM-list size beyond which JOIN "
1497 "constructs are not flattened."),
1498 gettext_noop("The planner will flatten explicit JOIN "
1499 "constructs into lists of FROM items whenever a "
1500 "list of no more than this many items would result.")
1502 &join_collapse_limit,
1507 {"geqo_threshold", PGC_USERSET, QUERY_TUNING_GEQO,
1508 gettext_noop("Sets the threshold of FROM items beyond which GEQO is used."),
1516 {"geqo_effort", PGC_USERSET, QUERY_TUNING_GEQO,
1517 gettext_noop("GEQO: effort is used to set the default for other GEQO parameters."),
1521 DEFAULT_GEQO_EFFORT, MIN_GEQO_EFFORT, MAX_GEQO_EFFORT,
1525 {"geqo_pool_size", PGC_USERSET, QUERY_TUNING_GEQO,
1526 gettext_noop("GEQO: number of individuals in the population."),
1527 gettext_noop("Zero selects a suitable default value.")
1534 {"geqo_generations", PGC_USERSET, QUERY_TUNING_GEQO,
1535 gettext_noop("GEQO: number of iterations of the algorithm."),
1536 gettext_noop("Zero selects a suitable default value.")
1544 /* This is PGC_SUSET to prevent hiding from log_lock_waits. */
1545 {"deadlock_timeout", PGC_SUSET, LOCK_MANAGEMENT,
1546 gettext_noop("Sets the time to wait on a lock before checking for deadlock."),
1556 {"max_standby_archive_delay", PGC_SIGHUP, REPLICATION_STANDBY,
1557 gettext_noop("Sets the maximum delay before canceling queries when a hot standby server is processing archived WAL data."),
1561 &max_standby_archive_delay,
1562 30 * 1000, -1, INT_MAX,
1567 {"max_standby_streaming_delay", PGC_SIGHUP, REPLICATION_STANDBY,
1568 gettext_noop("Sets the maximum delay before canceling queries when a hot standby server is processing streamed WAL data."),
1572 &max_standby_streaming_delay,
1573 30 * 1000, -1, INT_MAX,
1578 {"wal_receiver_status_interval", PGC_SIGHUP, REPLICATION_STANDBY,
1579 gettext_noop("Sets the maximum interval between WAL receiver status reports to the primary."),
1583 &wal_receiver_status_interval,
1584 10, 0, INT_MAX / 1000,
1589 {"wal_receiver_timeout", PGC_SIGHUP, REPLICATION_STANDBY,
1590 gettext_noop("Sets the maximum wait time to receive data from master."),
1594 &wal_receiver_timeout,
1595 60 * 1000, 0, INT_MAX,
1600 {"max_connections", PGC_POSTMASTER, CONN_AUTH_SETTINGS,
1601 gettext_noop("Sets the maximum number of concurrent connections."),
1605 100, 1, MAX_BACKENDS,
1606 check_maxconnections, NULL, NULL
1610 {"superuser_reserved_connections", PGC_POSTMASTER, CONN_AUTH_SETTINGS,
1611 gettext_noop("Sets the number of connection slots reserved for superusers."),
1620 * We sometimes multiply the number of shared buffers by two without
1621 * checking for overflow, so we mustn't allow more than INT_MAX / 2.
1624 {"shared_buffers", PGC_POSTMASTER, RESOURCES_MEM,
1625 gettext_noop("Sets the number of shared memory buffers used by the server."),
1630 1024, 16, INT_MAX / 2,
1635 {"temp_buffers", PGC_USERSET, RESOURCES_MEM,
1636 gettext_noop("Sets the maximum number of temporary buffers used by each session."),
1641 1024, 100, INT_MAX / 2,
1642 check_temp_buffers, NULL, NULL
1646 {"port", PGC_POSTMASTER, CONN_AUTH_SETTINGS,
1647 gettext_noop("Sets the TCP port the server listens on."),
1651 DEF_PGPORT, 1, 65535,
1656 {"unix_socket_permissions", PGC_POSTMASTER, CONN_AUTH_SETTINGS,
1657 gettext_noop("Sets the access permissions of the Unix-domain socket."),
1658 gettext_noop("Unix-domain sockets use the usual Unix file system "
1659 "permission set. The parameter value is expected "
1660 "to be a numeric mode specification in the form "
1661 "accepted by the chmod and umask system calls. "
1662 "(To use the customary octal format the number must "
1663 "start with a 0 (zero).)")
1665 &Unix_socket_permissions,
1667 NULL, NULL, show_unix_socket_permissions
1671 {"log_file_mode", PGC_SIGHUP, LOGGING_WHERE,
1672 gettext_noop("Sets the file permissions for log files."),
1673 gettext_noop("The parameter value is expected "
1674 "to be a numeric mode specification in the form "
1675 "accepted by the chmod and umask system calls. "
1676 "(To use the customary octal format the number must "
1677 "start with a 0 (zero).)")
1681 NULL, NULL, show_log_file_mode
1685 {"work_mem", PGC_USERSET, RESOURCES_MEM,
1686 gettext_noop("Sets the maximum memory to be used for query workspaces."),
1687 gettext_noop("This much memory can be used by each internal "
1688 "sort operation and hash table before switching to "
1689 "temporary disk files."),
1693 1024, 64, MAX_KILOBYTES,
1698 {"maintenance_work_mem", PGC_USERSET, RESOURCES_MEM,
1699 gettext_noop("Sets the maximum memory to be used for maintenance operations."),
1700 gettext_noop("This includes operations such as VACUUM and CREATE INDEX."),
1703 &maintenance_work_mem,
1704 16384, 1024, MAX_KILOBYTES,
1709 * We use the hopefully-safely-small value of 100kB as the compiled-in
1710 * default for max_stack_depth. InitializeGUCOptions will increase it if
1711 * possible, depending on the actual platform-specific stack limit.
1714 {"max_stack_depth", PGC_SUSET, RESOURCES_MEM,
1715 gettext_noop("Sets the maximum stack depth, in kilobytes."),
1720 100, 100, MAX_KILOBYTES,
1721 check_max_stack_depth, assign_max_stack_depth, NULL
1725 {"temp_file_limit", PGC_SUSET, RESOURCES_DISK,
1726 gettext_noop("Limits the total size of all temporary files used by each session."),
1727 gettext_noop("-1 means no limit."),
1736 {"vacuum_cost_page_hit", PGC_USERSET, RESOURCES_VACUUM_DELAY,
1737 gettext_noop("Vacuum cost for a page found in the buffer cache."),
1746 {"vacuum_cost_page_miss", PGC_USERSET, RESOURCES_VACUUM_DELAY,
1747 gettext_noop("Vacuum cost for a page not found in the buffer cache."),
1750 &VacuumCostPageMiss,
1756 {"vacuum_cost_page_dirty", PGC_USERSET, RESOURCES_VACUUM_DELAY,
1757 gettext_noop("Vacuum cost for a page dirtied by vacuum."),
1760 &VacuumCostPageDirty,
1766 {"vacuum_cost_limit", PGC_USERSET, RESOURCES_VACUUM_DELAY,
1767 gettext_noop("Vacuum cost amount available before napping."),
1776 {"vacuum_cost_delay", PGC_USERSET, RESOURCES_VACUUM_DELAY,
1777 gettext_noop("Vacuum cost delay in milliseconds."),
1787 {"autovacuum_vacuum_cost_delay", PGC_SIGHUP, AUTOVACUUM,
1788 gettext_noop("Vacuum cost delay in milliseconds, for autovacuum."),
1792 &autovacuum_vac_cost_delay,
1798 {"autovacuum_vacuum_cost_limit", PGC_SIGHUP, AUTOVACUUM,
1799 gettext_noop("Vacuum cost amount available before napping, for autovacuum."),
1802 &autovacuum_vac_cost_limit,
1808 {"max_files_per_process", PGC_POSTMASTER, RESOURCES_KERNEL,
1809 gettext_noop("Sets the maximum number of simultaneously open files for each server process."),
1812 &max_files_per_process,
1818 * See also CheckRequiredParameterValues() if this parameter changes
1821 {"max_prepared_transactions", PGC_POSTMASTER, RESOURCES_MEM,
1822 gettext_noop("Sets the maximum number of simultaneously prepared transactions."),
1825 &max_prepared_xacts,
1832 {"trace_lock_oidmin", PGC_SUSET, DEVELOPER_OPTIONS,
1833 gettext_noop("No description available."),
1838 FirstNormalObjectId, 0, INT_MAX,
1842 {"trace_lock_table", PGC_SUSET, DEVELOPER_OPTIONS,
1843 gettext_noop("No description available."),
1854 {"statement_timeout", PGC_USERSET, CLIENT_CONN_STATEMENT,
1855 gettext_noop("Sets the maximum allowed duration of any statement."),
1856 gettext_noop("A value of 0 turns off the timeout."),
1865 {"lock_timeout", PGC_USERSET, CLIENT_CONN_STATEMENT,
1866 gettext_noop("Sets the maximum allowed duration of any wait for a lock."),
1867 gettext_noop("A value of 0 turns off the timeout."),
1876 {"vacuum_freeze_min_age", PGC_USERSET, CLIENT_CONN_STATEMENT,
1877 gettext_noop("Minimum age at which VACUUM should freeze a table row."),
1880 &vacuum_freeze_min_age,
1881 50000000, 0, 1000000000,
1886 {"vacuum_freeze_table_age", PGC_USERSET, CLIENT_CONN_STATEMENT,
1887 gettext_noop("Age at which VACUUM should scan whole table to freeze tuples."),
1890 &vacuum_freeze_table_age,
1891 150000000, 0, 2000000000,
1896 {"vacuum_defer_cleanup_age", PGC_SIGHUP, REPLICATION_MASTER,
1897 gettext_noop("Number of transactions by which VACUUM and HOT cleanup should be deferred, if any."),
1900 &vacuum_defer_cleanup_age,
1906 * See also CheckRequiredParameterValues() if this parameter changes
1909 {"max_locks_per_transaction", PGC_POSTMASTER, LOCK_MANAGEMENT,
1910 gettext_noop("Sets the maximum number of locks per transaction."),
1911 gettext_noop("The shared lock table is sized on the assumption that "
1912 "at most max_locks_per_transaction * max_connections distinct "
1913 "objects will need to be locked at any one time.")
1915 &max_locks_per_xact,
1921 {"max_pred_locks_per_transaction", PGC_POSTMASTER, LOCK_MANAGEMENT,
1922 gettext_noop("Sets the maximum number of predicate locks per transaction."),
1923 gettext_noop("The shared predicate lock table is sized on the assumption that "
1924 "at most max_pred_locks_per_transaction * max_connections distinct "
1925 "objects will need to be locked at any one time.")
1927 &max_predicate_locks_per_xact,
1933 {"authentication_timeout", PGC_SIGHUP, CONN_AUTH_SECURITY,
1934 gettext_noop("Sets the maximum allowed time to complete client authentication."),
1938 &AuthenticationTimeout,
1944 /* Not for general use */
1945 {"pre_auth_delay", PGC_SIGHUP, DEVELOPER_OPTIONS,
1946 gettext_noop("Waits N seconds on connection startup before authentication."),
1947 gettext_noop("This allows attaching a debugger to the process."),
1948 GUC_NOT_IN_SAMPLE | GUC_UNIT_S
1956 {"wal_keep_segments", PGC_SIGHUP, REPLICATION_SENDING,
1957 gettext_noop("Sets the number of WAL files held for standby servers."),
1966 {"checkpoint_segments", PGC_SIGHUP, WAL_CHECKPOINTS,
1967 gettext_noop("Sets the maximum distance in log segments between automatic WAL checkpoints."),
1970 &CheckPointSegments,
1976 {"checkpoint_timeout", PGC_SIGHUP, WAL_CHECKPOINTS,
1977 gettext_noop("Sets the maximum time between automatic WAL checkpoints."),
1987 {"checkpoint_warning", PGC_SIGHUP, WAL_CHECKPOINTS,
1988 gettext_noop("Enables warnings if checkpoint segments are filled more "
1989 "frequently than this."),
1990 gettext_noop("Write a message to the server log if checkpoints "
1991 "caused by the filling of checkpoint segment files happens more "
1992 "frequently than this number of seconds. Zero turns off the warning."),
2001 {"wal_buffers", PGC_POSTMASTER, WAL_SETTINGS,
2002 gettext_noop("Sets the number of disk-page buffers in shared memory for WAL."),
2008 check_wal_buffers, NULL, NULL
2012 {"wal_writer_delay", PGC_SIGHUP, WAL_SETTINGS,
2013 gettext_noop("WAL writer sleep time between WAL flushes."),
2023 /* see max_connections */
2024 {"max_wal_senders", PGC_POSTMASTER, REPLICATION_SENDING,
2025 gettext_noop("Sets the maximum number of simultaneously running WAL sender processes."),
2034 {"wal_sender_timeout", PGC_SIGHUP, REPLICATION_SENDING,
2035 gettext_noop("Sets the maximum time to wait for WAL replication."),
2039 &wal_sender_timeout,
2040 60 * 1000, 0, INT_MAX,
2045 {"commit_delay", PGC_SUSET, WAL_SETTINGS,
2046 gettext_noop("Sets the delay in microseconds between transaction commit and "
2047 "flushing WAL to disk."),
2049 /* we have no microseconds designation, so can't supply units here */
2057 {"commit_siblings", PGC_USERSET, WAL_SETTINGS,
2058 gettext_noop("Sets the minimum concurrent open transactions before performing "
2068 {"extra_float_digits", PGC_USERSET, CLIENT_CONN_LOCALE,
2069 gettext_noop("Sets the number of digits displayed for floating-point values."),
2070 gettext_noop("This affects real, double precision, and geometric data types. "
2071 "The parameter value is added to the standard number of digits "
2072 "(FLT_DIG or DBL_DIG as appropriate).")
2074 &extra_float_digits,
2080 {"log_min_duration_statement", PGC_SUSET, LOGGING_WHEN,
2081 gettext_noop("Sets the minimum execution time above which "
2082 "statements will be logged."),
2083 gettext_noop("Zero prints all queries. -1 turns this feature off."),
2086 &log_min_duration_statement,
2092 {"log_autovacuum_min_duration", PGC_SIGHUP, LOGGING_WHAT,
2093 gettext_noop("Sets the minimum execution time above which "
2094 "autovacuum actions will be logged."),
2095 gettext_noop("Zero prints all actions. -1 turns autovacuum logging off."),
2098 &Log_autovacuum_min_duration,
2104 {"bgwriter_delay", PGC_SIGHUP, RESOURCES_BGWRITER,
2105 gettext_noop("Background writer sleep time between rounds."),
2115 {"bgwriter_lru_maxpages", PGC_SIGHUP, RESOURCES_BGWRITER,
2116 gettext_noop("Background writer maximum number of LRU pages to flush per round."),
2119 &bgwriter_lru_maxpages,
2125 {"effective_io_concurrency",
2131 RESOURCES_ASYNCHRONOUS,
2132 gettext_noop("Number of simultaneous requests that can be handled efficiently by the disk subsystem."),
2133 gettext_noop("For RAID arrays, this should be approximately the number of drive spindles in the array.")
2135 &effective_io_concurrency,
2141 check_effective_io_concurrency, assign_effective_io_concurrency, NULL
2145 {"log_rotation_age", PGC_SIGHUP, LOGGING_WHERE,
2146 gettext_noop("Automatic log file rotation will occur after N minutes."),
2151 HOURS_PER_DAY * MINS_PER_HOUR, 0, INT_MAX / SECS_PER_MINUTE,
2156 {"log_rotation_size", PGC_SIGHUP, LOGGING_WHERE,
2157 gettext_noop("Automatic log file rotation will occur after N kilobytes."),
2162 10 * 1024, 0, INT_MAX / 1024,
2167 {"max_function_args", PGC_INTERNAL, PRESET_OPTIONS,
2168 gettext_noop("Shows the maximum number of function arguments."),
2170 GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
2173 FUNC_MAX_ARGS, FUNC_MAX_ARGS, FUNC_MAX_ARGS,
2178 {"max_index_keys", PGC_INTERNAL, PRESET_OPTIONS,
2179 gettext_noop("Shows the maximum number of index keys."),
2181 GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
2184 INDEX_MAX_KEYS, INDEX_MAX_KEYS, INDEX_MAX_KEYS,
2189 {"max_identifier_length", PGC_INTERNAL, PRESET_OPTIONS,
2190 gettext_noop("Shows the maximum identifier length."),
2192 GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
2194 &max_identifier_length,
2195 NAMEDATALEN - 1, NAMEDATALEN - 1, NAMEDATALEN - 1,
2200 {"block_size", PGC_INTERNAL, PRESET_OPTIONS,
2201 gettext_noop("Shows the size of a disk block."),
2203 GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
2206 BLCKSZ, BLCKSZ, BLCKSZ,
2211 {"segment_size", PGC_INTERNAL, PRESET_OPTIONS,
2212 gettext_noop("Shows the number of pages per disk file."),
2214 GUC_UNIT_BLOCKS | GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
2217 RELSEG_SIZE, RELSEG_SIZE, RELSEG_SIZE,
2222 {"wal_block_size", PGC_INTERNAL, PRESET_OPTIONS,
2223 gettext_noop("Shows the block size in the write ahead log."),
2225 GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
2228 XLOG_BLCKSZ, XLOG_BLCKSZ, XLOG_BLCKSZ,
2233 {"wal_segment_size", PGC_INTERNAL, PRESET_OPTIONS,
2234 gettext_noop("Shows the number of pages per write ahead log segment."),
2236 GUC_UNIT_XBLOCKS | GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
2239 (XLOG_SEG_SIZE / XLOG_BLCKSZ),
2240 (XLOG_SEG_SIZE / XLOG_BLCKSZ),
2241 (XLOG_SEG_SIZE / XLOG_BLCKSZ),
2246 {"autovacuum_naptime", PGC_SIGHUP, AUTOVACUUM,
2247 gettext_noop("Time to sleep between autovacuum runs."),
2251 &autovacuum_naptime,
2252 60, 1, INT_MAX / 1000,
2256 {"autovacuum_vacuum_threshold", PGC_SIGHUP, AUTOVACUUM,
2257 gettext_noop("Minimum number of tuple updates or deletes prior to vacuum."),
2260 &autovacuum_vac_thresh,
2265 {"autovacuum_analyze_threshold", PGC_SIGHUP, AUTOVACUUM,
2266 gettext_noop("Minimum number of tuple inserts, updates, or deletes prior to analyze."),
2269 &autovacuum_anl_thresh,
2274 /* see varsup.c for why this is PGC_POSTMASTER not PGC_SIGHUP */
2275 {"autovacuum_freeze_max_age", PGC_POSTMASTER, AUTOVACUUM,
2276 gettext_noop("Age at which to autovacuum a table to prevent transaction ID wraparound."),
2279 &autovacuum_freeze_max_age,
2280 /* see pg_resetxlog if you change the upper-limit value */
2281 200000000, 100000000, 2000000000,
2285 /* see max_connections */
2286 {"autovacuum_max_workers", PGC_POSTMASTER, AUTOVACUUM,
2287 gettext_noop("Sets the maximum number of simultaneously running autovacuum worker processes."),
2290 &autovacuum_max_workers,
2292 check_autovacuum_max_workers, NULL, NULL
2296 {"tcp_keepalives_idle", PGC_USERSET, CLIENT_CONN_OTHER,
2297 gettext_noop("Time between issuing TCP keepalives."),
2298 gettext_noop("A value of 0 uses the system default."),
2301 &tcp_keepalives_idle,
2303 NULL, assign_tcp_keepalives_idle, show_tcp_keepalives_idle
2307 {"tcp_keepalives_interval", PGC_USERSET, CLIENT_CONN_OTHER,
2308 gettext_noop("Time between TCP keepalive retransmits."),
2309 gettext_noop("A value of 0 uses the system default."),
2312 &tcp_keepalives_interval,
2314 NULL, assign_tcp_keepalives_interval, show_tcp_keepalives_interval
2318 {"ssl_renegotiation_limit", PGC_USERSET, CONN_AUTH_SECURITY,
2319 gettext_noop("Set the amount of traffic to send and receive before renegotiating the encryption keys."),
2323 &ssl_renegotiation_limit,
2324 512 * 1024, 0, MAX_KILOBYTES,
2329 {"tcp_keepalives_count", PGC_USERSET, CLIENT_CONN_OTHER,
2330 gettext_noop("Maximum number of TCP keepalive retransmits."),
2331 gettext_noop("This controls the number of consecutive keepalive retransmits that can be "
2332 "lost before a connection is considered dead. A value of 0 uses the "
2335 &tcp_keepalives_count,
2337 NULL, assign_tcp_keepalives_count, show_tcp_keepalives_count
2341 {"gin_fuzzy_search_limit", PGC_USERSET, CLIENT_CONN_OTHER,
2342 gettext_noop("Sets the maximum allowed result for exact search by GIN."),
2346 &GinFuzzySearchLimit,
2352 {"effective_cache_size", PGC_USERSET, QUERY_TUNING_COST,
2353 gettext_noop("Sets the planner's assumption about the size of the disk cache."),
2354 gettext_noop("That is, the portion of the kernel's disk cache that "
2355 "will be used for PostgreSQL data files. This is measured in disk "
2356 "pages, which are normally 8 kB each."),
2359 &effective_cache_size,
2360 DEFAULT_EFFECTIVE_CACHE_SIZE, 1, INT_MAX,
2365 /* Can't be set in postgresql.conf */
2366 {"server_version_num", PGC_INTERNAL, PRESET_OPTIONS,
2367 gettext_noop("Shows the server version as an integer."),
2369 GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
2371 &server_version_num,
2372 PG_VERSION_NUM, PG_VERSION_NUM, PG_VERSION_NUM,
2377 {"log_temp_files", PGC_SUSET, LOGGING_WHAT,
2378 gettext_noop("Log the use of temporary files larger than this number of kilobytes."),
2379 gettext_noop("Zero logs all files. The default is -1 (turning this feature off)."),
2388 {"track_activity_query_size", PGC_POSTMASTER, RESOURCES_MEM,
2389 gettext_noop("Sets the size reserved for pg_stat_activity.query, in bytes."),
2392 &pgstat_track_activity_query_size,
2397 /* End-of-list marker */
2399 {NULL, 0, 0, NULL, NULL}, NULL, 0, 0, 0, NULL, NULL, NULL
2404 static struct config_real ConfigureNamesReal[] =
2407 {"seq_page_cost", PGC_USERSET, QUERY_TUNING_COST,
2408 gettext_noop("Sets the planner's estimate of the cost of a "
2409 "sequentially fetched disk page."),
2413 DEFAULT_SEQ_PAGE_COST, 0, DBL_MAX,
2417 {"random_page_cost", PGC_USERSET, QUERY_TUNING_COST,
2418 gettext_noop("Sets the planner's estimate of the cost of a "
2419 "nonsequentially fetched disk page."),
2423 DEFAULT_RANDOM_PAGE_COST, 0, DBL_MAX,
2427 {"cpu_tuple_cost", PGC_USERSET, QUERY_TUNING_COST,
2428 gettext_noop("Sets the planner's estimate of the cost of "
2429 "processing each tuple (row)."),
2433 DEFAULT_CPU_TUPLE_COST, 0, DBL_MAX,
2437 {"cpu_index_tuple_cost", PGC_USERSET, QUERY_TUNING_COST,
2438 gettext_noop("Sets the planner's estimate of the cost of "
2439 "processing each index entry during an index scan."),
2442 &cpu_index_tuple_cost,
2443 DEFAULT_CPU_INDEX_TUPLE_COST, 0, DBL_MAX,
2447 {"cpu_operator_cost", PGC_USERSET, QUERY_TUNING_COST,
2448 gettext_noop("Sets the planner's estimate of the cost of "
2449 "processing each operator or function call."),
2453 DEFAULT_CPU_OPERATOR_COST, 0, DBL_MAX,
2458 {"cursor_tuple_fraction", PGC_USERSET, QUERY_TUNING_OTHER,
2459 gettext_noop("Sets the planner's estimate of the fraction of "
2460 "a cursor's rows that will be retrieved."),
2463 &cursor_tuple_fraction,
2464 DEFAULT_CURSOR_TUPLE_FRACTION, 0.0, 1.0,
2469 {"geqo_selection_bias", PGC_USERSET, QUERY_TUNING_GEQO,
2470 gettext_noop("GEQO: selective pressure within the population."),
2473 &Geqo_selection_bias,
2474 DEFAULT_GEQO_SELECTION_BIAS,
2475 MIN_GEQO_SELECTION_BIAS, MAX_GEQO_SELECTION_BIAS,
2479 {"geqo_seed", PGC_USERSET, QUERY_TUNING_GEQO,
2480 gettext_noop("GEQO: seed for random path selection."),
2489 {"bgwriter_lru_multiplier", PGC_SIGHUP, RESOURCES_BGWRITER,
2490 gettext_noop("Multiple of the average buffer usage to free per round."),
2493 &bgwriter_lru_multiplier,
2499 {"seed", PGC_USERSET, UNGROUPED,
2500 gettext_noop("Sets the seed for random-number generation."),
2502 GUC_NO_SHOW_ALL | GUC_NO_RESET_ALL | GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
2506 check_random_seed, assign_random_seed, show_random_seed
2510 {"autovacuum_vacuum_scale_factor", PGC_SIGHUP, AUTOVACUUM,
2511 gettext_noop("Number of tuple updates or deletes prior to vacuum as a fraction of reltuples."),
2514 &autovacuum_vac_scale,
2519 {"autovacuum_analyze_scale_factor", PGC_SIGHUP, AUTOVACUUM,
2520 gettext_noop("Number of tuple inserts, updates, or deletes prior to analyze as a fraction of reltuples."),
2523 &autovacuum_anl_scale,
2529 {"checkpoint_completion_target", PGC_SIGHUP, WAL_CHECKPOINTS,
2530 gettext_noop("Time spent flushing dirty buffers during checkpoint, as fraction of checkpoint interval."),
2533 &CheckPointCompletionTarget,
2538 /* End-of-list marker */
2540 {NULL, 0, 0, NULL, NULL}, NULL, 0.0, 0.0, 0.0, NULL, NULL, NULL
2545 static struct config_string ConfigureNamesString[] =
2548 {"archive_command", PGC_SIGHUP, WAL_ARCHIVING,
2549 gettext_noop("Sets the shell command that will be called to archive a WAL file."),
2552 &XLogArchiveCommand,
2554 NULL, NULL, show_archive_command
2558 {"client_encoding", PGC_USERSET, CLIENT_CONN_LOCALE,
2559 gettext_noop("Sets the client's character set encoding."),
2561 GUC_IS_NAME | GUC_REPORT
2563 &client_encoding_string,
2565 check_client_encoding, assign_client_encoding, NULL
2569 {"log_line_prefix", PGC_SIGHUP, LOGGING_WHAT,
2570 gettext_noop("Controls information prefixed to each log line."),
2571 gettext_noop("If blank, no prefix is used.")
2579 {"log_timezone", PGC_SIGHUP, LOGGING_WHAT,
2580 gettext_noop("Sets the time zone to use in log messages."),
2583 &log_timezone_string,
2585 check_log_timezone, assign_log_timezone, show_log_timezone
2589 {"DateStyle", PGC_USERSET, CLIENT_CONN_LOCALE,
2590 gettext_noop("Sets the display format for date and time values."),
2591 gettext_noop("Also controls interpretation of ambiguous "
2593 GUC_LIST_INPUT | GUC_REPORT
2597 check_datestyle, assign_datestyle, NULL
2601 {"default_tablespace", PGC_USERSET, CLIENT_CONN_STATEMENT,
2602 gettext_noop("Sets the default tablespace to create tables and indexes in."),
2603 gettext_noop("An empty string selects the database's default tablespace."),
2606 &default_tablespace,
2608 check_default_tablespace, NULL, NULL
2612 {"temp_tablespaces", PGC_USERSET, CLIENT_CONN_STATEMENT,
2613 gettext_noop("Sets the tablespace(s) to use for temporary tables and sort files."),
2615 GUC_LIST_INPUT | GUC_LIST_QUOTE
2619 check_temp_tablespaces, assign_temp_tablespaces, NULL
2623 {"dynamic_library_path", PGC_SUSET, CLIENT_CONN_OTHER,
2624 gettext_noop("Sets the path for dynamically loadable modules."),
2625 gettext_noop("If a dynamically loadable module needs to be opened and "
2626 "the specified name does not have a directory component (i.e., the "
2627 "name does not contain a slash), the system will search this path for "
2628 "the specified file."),
2631 &Dynamic_library_path,
2637 {"krb_server_keyfile", PGC_SIGHUP, CONN_AUTH_SECURITY,
2638 gettext_noop("Sets the location of the Kerberos server key file."),
2642 &pg_krb_server_keyfile,
2648 {"krb_srvname", PGC_SIGHUP, CONN_AUTH_SECURITY,
2649 gettext_noop("Sets the name of the Kerberos service."),
2658 {"bonjour_name", PGC_POSTMASTER, CONN_AUTH_SETTINGS,
2659 gettext_noop("Sets the Bonjour service name."),
2667 /* See main.c about why defaults for LC_foo are not all alike */
2670 {"lc_collate", PGC_INTERNAL, CLIENT_CONN_LOCALE,
2671 gettext_noop("Shows the collation order locale."),
2673 GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
2681 {"lc_ctype", PGC_INTERNAL, CLIENT_CONN_LOCALE,
2682 gettext_noop("Shows the character classification and case conversion locale."),
2684 GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
2692 {"lc_messages", PGC_SUSET, CLIENT_CONN_LOCALE,
2693 gettext_noop("Sets the language in which messages are displayed."),
2698 check_locale_messages, assign_locale_messages, NULL
2702 {"lc_monetary", PGC_USERSET, CLIENT_CONN_LOCALE,
2703 gettext_noop("Sets the locale for formatting monetary amounts."),
2708 check_locale_monetary, assign_locale_monetary, NULL
2712 {"lc_numeric", PGC_USERSET, CLIENT_CONN_LOCALE,
2713 gettext_noop("Sets the locale for formatting numbers."),
2718 check_locale_numeric, assign_locale_numeric, NULL
2722 {"lc_time", PGC_USERSET, CLIENT_CONN_LOCALE,
2723 gettext_noop("Sets the locale for formatting date and time values."),
2728 check_locale_time, assign_locale_time, NULL
2732 {"shared_preload_libraries", PGC_POSTMASTER, RESOURCES_KERNEL,
2733 gettext_noop("Lists shared libraries to preload into server."),
2735 GUC_LIST_INPUT | GUC_LIST_QUOTE | GUC_SUPERUSER_ONLY
2737 &shared_preload_libraries_string,
2743 {"local_preload_libraries", PGC_BACKEND, CLIENT_CONN_OTHER,
2744 gettext_noop("Lists shared libraries to preload into each backend."),
2746 GUC_LIST_INPUT | GUC_LIST_QUOTE
2748 &local_preload_libraries_string,
2754 {"search_path", PGC_USERSET, CLIENT_CONN_STATEMENT,
2755 gettext_noop("Sets the schema search order for names that are not schema-qualified."),
2757 GUC_LIST_INPUT | GUC_LIST_QUOTE
2759 &namespace_search_path,
2761 check_search_path, assign_search_path, NULL
2765 /* Can't be set in postgresql.conf */
2766 {"server_encoding", PGC_INTERNAL, CLIENT_CONN_LOCALE,
2767 gettext_noop("Sets the server (database) character set encoding."),
2769 GUC_IS_NAME | GUC_REPORT | GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
2771 &server_encoding_string,
2777 /* Can't be set in postgresql.conf */
2778 {"server_version", PGC_INTERNAL, PRESET_OPTIONS,
2779 gettext_noop("Shows the server version."),
2781 GUC_REPORT | GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
2783 &server_version_string,
2789 /* Not for general use --- used by SET ROLE */
2790 {"role", PGC_USERSET, UNGROUPED,
2791 gettext_noop("Sets the current role."),
2793 GUC_IS_NAME | GUC_NO_SHOW_ALL | GUC_NO_RESET_ALL | GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE | GUC_NOT_WHILE_SEC_REST
2797 check_role, assign_role, show_role
2801 /* Not for general use --- used by SET SESSION AUTHORIZATION */
2802 {"session_authorization", PGC_USERSET, UNGROUPED,
2803 gettext_noop("Sets the session user name."),
2805 GUC_IS_NAME | GUC_REPORT | GUC_NO_SHOW_ALL | GUC_NO_RESET_ALL | GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE | GUC_NOT_WHILE_SEC_REST
2807 &session_authorization_string,
2809 check_session_authorization, assign_session_authorization, NULL
2813 {"log_destination", PGC_SIGHUP, LOGGING_WHERE,
2814 gettext_noop("Sets the destination for server log output."),
2815 gettext_noop("Valid values are combinations of \"stderr\", "
2816 "\"syslog\", \"csvlog\", and \"eventlog\", "
2817 "depending on the platform."),
2820 &log_destination_string,
2822 check_log_destination, assign_log_destination, NULL
2825 {"log_directory", PGC_SIGHUP, LOGGING_WHERE,
2826 gettext_noop("Sets the destination directory for log files."),
2827 gettext_noop("Can be specified as relative to the data directory "
2828 "or as absolute path."),
2833 check_canonical_path, NULL, NULL
2836 {"log_filename", PGC_SIGHUP, LOGGING_WHERE,
2837 gettext_noop("Sets the file name pattern for log files."),
2842 "postgresql-%Y-%m-%d_%H%M%S.log",
2847 {"syslog_ident", PGC_SIGHUP, LOGGING_WHERE,
2848 gettext_noop("Sets the program name used to identify PostgreSQL "
2849 "messages in syslog."),
2854 NULL, assign_syslog_ident, NULL
2858 {"event_source", PGC_POSTMASTER, LOGGING_WHERE,
2859 gettext_noop("Sets the application name used to identify "
2860 "PostgreSQL messages in the event log."),
2869 {"TimeZone", PGC_USERSET, CLIENT_CONN_LOCALE,
2870 gettext_noop("Sets the time zone for displaying and interpreting time stamps."),
2876 check_timezone, assign_timezone, show_timezone
2879 {"timezone_abbreviations", PGC_USERSET, CLIENT_CONN_LOCALE,
2880 gettext_noop("Selects a file of time zone abbreviations."),
2883 &timezone_abbreviations_string,
2885 check_timezone_abbreviations, assign_timezone_abbreviations, NULL
2889 {"transaction_isolation", PGC_USERSET, CLIENT_CONN_STATEMENT,
2890 gettext_noop("Sets the current transaction's isolation level."),
2892 GUC_NO_RESET_ALL | GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
2894 &XactIsoLevel_string,
2896 check_XactIsoLevel, assign_XactIsoLevel, show_XactIsoLevel
2900 {"unix_socket_group", PGC_POSTMASTER, CONN_AUTH_SETTINGS,
2901 gettext_noop("Sets the owning group of the Unix-domain socket."),
2902 gettext_noop("The owning user of the socket is always the user "
2903 "that starts the server.")
2911 {"unix_socket_directories", PGC_POSTMASTER, CONN_AUTH_SETTINGS,
2912 gettext_noop("Sets the directories where Unix-domain sockets will be created."),
2916 &Unix_socket_directories,
2917 #ifdef HAVE_UNIX_SOCKETS
2918 DEFAULT_PGSOCKET_DIR,
2926 {"listen_addresses", PGC_POSTMASTER, CONN_AUTH_SETTINGS,
2927 gettext_noop("Sets the host name or IP address(es) to listen to."),
2937 {"data_directory", PGC_POSTMASTER, FILE_LOCATIONS,
2938 gettext_noop("Sets the server's data directory."),
2948 {"config_file", PGC_POSTMASTER, FILE_LOCATIONS,
2949 gettext_noop("Sets the server's main configuration file."),
2951 GUC_DISALLOW_IN_FILE | GUC_SUPERUSER_ONLY
2959 {"hba_file", PGC_POSTMASTER, FILE_LOCATIONS,
2960 gettext_noop("Sets the server's \"hba\" configuration file."),
2970 {"ident_file", PGC_POSTMASTER, FILE_LOCATIONS,
2971 gettext_noop("Sets the server's \"ident\" configuration file."),
2981 {"external_pid_file", PGC_POSTMASTER, FILE_LOCATIONS,
2982 gettext_noop("Writes the postmaster PID to the specified file."),
2988 check_canonical_path, NULL, NULL
2992 {"ssl_cert_file", PGC_POSTMASTER, CONN_AUTH_SECURITY,
2993 gettext_noop("Location of the SSL server certificate file."),
3002 {"ssl_key_file", PGC_POSTMASTER, CONN_AUTH_SECURITY,
3003 gettext_noop("Location of the SSL server private key file."),
3012 {"ssl_ca_file", PGC_POSTMASTER, CONN_AUTH_SECURITY,
3013 gettext_noop("Location of the SSL certificate authority file."),
3022 {"ssl_crl_file", PGC_POSTMASTER, CONN_AUTH_SECURITY,
3023 gettext_noop("Location of the SSL certificate revocation list file."),
3032 {"stats_temp_directory", PGC_SIGHUP, STATS_COLLECTOR,
3033 gettext_noop("Writes temporary statistics files to the specified directory."),
3037 &pgstat_temp_directory,
3039 check_canonical_path, assign_pgstat_temp_directory, NULL
3043 {"synchronous_standby_names", PGC_SIGHUP, REPLICATION_MASTER,
3044 gettext_noop("List of names of potential synchronous standbys."),
3048 &SyncRepStandbyNames,
3050 check_synchronous_standby_names, NULL, NULL
3054 {"default_text_search_config", PGC_USERSET, CLIENT_CONN_LOCALE,
3055 gettext_noop("Sets default text search configuration."),
3059 "pg_catalog.simple",
3060 check_TSCurrentConfig, assign_TSCurrentConfig, NULL
3064 {"ssl_ciphers", PGC_POSTMASTER, CONN_AUTH_SECURITY,
3065 gettext_noop("Sets the list of allowed SSL ciphers."),
3071 "DEFAULT:!LOW:!EXP:!MD5:@STRENGTH",
3079 {"application_name", PGC_USERSET, LOGGING_WHAT,
3080 gettext_noop("Sets the application name to be reported in statistics and logs."),
3082 GUC_IS_NAME | GUC_REPORT | GUC_NOT_IN_SAMPLE
3086 check_application_name, assign_application_name, NULL
3089 /* End-of-list marker */
3091 {NULL, 0, 0, NULL, NULL}, NULL, NULL, NULL, NULL, NULL
3096 static struct config_enum ConfigureNamesEnum[] =
3099 {"backslash_quote", PGC_USERSET, COMPAT_OPTIONS_PREVIOUS,
3100 gettext_noop("Sets whether \"\\'\" is allowed in string literals."),
3104 BACKSLASH_QUOTE_SAFE_ENCODING, backslash_quote_options,
3109 {"bytea_output", PGC_USERSET, CLIENT_CONN_STATEMENT,
3110 gettext_noop("Sets the output format for bytea."),
3114 BYTEA_OUTPUT_HEX, bytea_output_options,
3119 {"client_min_messages", PGC_USERSET, LOGGING_WHEN,
3120 gettext_noop("Sets the message levels that are sent to the client."),
3121 gettext_noop("Each level includes all the levels that follow it. The later"
3122 " the level, the fewer messages are sent.")
3124 &client_min_messages,
3125 NOTICE, client_message_level_options,
3130 {"constraint_exclusion", PGC_USERSET, QUERY_TUNING_OTHER,
3131 gettext_noop("Enables the planner to use constraints to optimize queries."),
3132 gettext_noop("Table scans will be skipped if their constraints"
3133 " guarantee that no rows match the query.")
3135 &constraint_exclusion,
3136 CONSTRAINT_EXCLUSION_PARTITION, constraint_exclusion_options,
3141 {"default_transaction_isolation", PGC_USERSET, CLIENT_CONN_STATEMENT,
3142 gettext_noop("Sets the transaction isolation level of each new transaction."),
3145 &DefaultXactIsoLevel,
3146 XACT_READ_COMMITTED, isolation_level_options,
3151 {"IntervalStyle", PGC_USERSET, CLIENT_CONN_LOCALE,
3152 gettext_noop("Sets the display format for interval values."),
3157 INTSTYLE_POSTGRES, intervalstyle_options,
3162 {"log_error_verbosity", PGC_SUSET, LOGGING_WHAT,
3163 gettext_noop("Sets the verbosity of logged messages."),
3166 &Log_error_verbosity,
3167 PGERROR_DEFAULT, log_error_verbosity_options,
3172 {"log_min_messages", PGC_SUSET, LOGGING_WHEN,
3173 gettext_noop("Sets the message levels that are logged."),
3174 gettext_noop("Each level includes all the levels that follow it. The later"
3175 " the level, the fewer messages are sent.")
3178 WARNING, server_message_level_options,
3183 {"log_min_error_statement", PGC_SUSET, LOGGING_WHEN,
3184 gettext_noop("Causes all statements generating error at or above this level to be logged."),
3185 gettext_noop("Each level includes all the levels that follow it. The later"
3186 " the level, the fewer messages are sent.")
3188 &log_min_error_statement,
3189 ERROR, server_message_level_options,
3194 {"log_statement", PGC_SUSET, LOGGING_WHAT,
3195 gettext_noop("Sets the type of statements logged."),
3199 LOGSTMT_NONE, log_statement_options,
3204 {"syslog_facility", PGC_SIGHUP, LOGGING_WHERE,
3205 gettext_noop("Sets the syslog \"facility\" to be used when syslog enabled."),
3214 syslog_facility_options,
3215 NULL, assign_syslog_facility, NULL
3219 {"session_replication_role", PGC_SUSET, CLIENT_CONN_STATEMENT,
3220 gettext_noop("Sets the session's behavior for triggers and rewrite rules."),
3223 &SessionReplicationRole,
3224 SESSION_REPLICATION_ROLE_ORIGIN, session_replication_role_options,
3225 NULL, assign_session_replication_role, NULL
3229 {"synchronous_commit", PGC_USERSET, WAL_SETTINGS,
3230 gettext_noop("Sets the current transaction's synchronization level."),
3233 &synchronous_commit,
3234 SYNCHRONOUS_COMMIT_ON, synchronous_commit_options,
3235 NULL, assign_synchronous_commit, NULL
3239 {"trace_recovery_messages", PGC_SIGHUP, DEVELOPER_OPTIONS,
3240 gettext_noop("Enables logging of recovery-related debugging information."),
3241 gettext_noop("Each level includes all the levels that follow it. The later"
3242 " the level, the fewer messages are sent.")
3244 &trace_recovery_messages,
3247 * client_message_level_options allows too many values, really, but
3248 * it's not worth having a separate options array for this.
3250 LOG, client_message_level_options,
3255 {"track_functions", PGC_SUSET, STATS_COLLECTOR,
3256 gettext_noop("Collects function-level statistics on database activity."),
3259 &pgstat_track_functions,
3260 TRACK_FUNC_OFF, track_function_options,
3265 {"wal_level", PGC_POSTMASTER, WAL_SETTINGS,
3266 gettext_noop("Set the level of information written to the WAL."),
3270 WAL_LEVEL_MINIMAL, wal_level_options,
3275 {"wal_sync_method", PGC_SIGHUP, WAL_SETTINGS,
3276 gettext_noop("Selects the method used for forcing WAL updates to disk."),
3280 DEFAULT_SYNC_METHOD, sync_method_options,
3281 NULL, assign_xlog_sync_method, NULL
3285 {"xmlbinary", PGC_USERSET, CLIENT_CONN_STATEMENT,
3286 gettext_noop("Sets how binary values are to be encoded in XML."),
3290 XMLBINARY_BASE64, xmlbinary_options,
3295 {"xmloption", PGC_USERSET, CLIENT_CONN_STATEMENT,
3296 gettext_noop("Sets whether XML data in implicit parsing and serialization "
3297 "operations is to be considered as documents or content fragments."),
3301 XMLOPTION_CONTENT, xmloption_options,
3306 /* End-of-list marker */
3308 {NULL, 0, 0, NULL, NULL}, NULL, 0, NULL, NULL, NULL, NULL
3312 /******** end of options list ********/
3316 * To allow continued support of obsolete names for GUC variables, we apply
3317 * the following mappings to any unrecognized name. Note that an old name
3318 * should be mapped to a new one only if the new variable has very similar
3319 * semantics to the old.
3321 static const char *const map_old_guc_names[] = {
3322 "sort_mem", "work_mem",
3323 "vacuum_mem", "maintenance_work_mem",
3329 * Actual lookup of variables is done through this single, sorted array.
3331 static struct config_generic **guc_variables;
3333 /* Current number of variables contained in the vector */
3334 static int num_guc_variables;
3336 /* Vector capacity */
3337 static int size_guc_variables;
3340 static bool guc_dirty; /* TRUE if need to do commit/abort work */
3342 static bool reporting_enabled; /* TRUE to enable GUC_REPORT */
3344 static int GUCNestLevel = 0; /* 1 when in main transaction */
3347 static int guc_var_compare(const void *a, const void *b);
3348 static int guc_name_compare(const char *namea, const char *nameb);
3349 static void InitializeGUCOptionsFromEnvironment(void);
3350 static void InitializeOneGUCOption(struct config_generic * gconf);
3351 static void push_old_value(struct config_generic * gconf, GucAction action);
3352 static void ReportGUCOption(struct config_generic * record);
3353 static void reapply_stacked_values(struct config_generic * variable,
3354 struct config_string * pHolder,
3356 const char *curvalue,
3357 GucContext curscontext, GucSource cursource);
3358 static void ShowGUCConfigOption(const char *name, DestReceiver *dest);
3359 static void ShowAllGUCConfig(DestReceiver *dest);
3360 static char *_ShowOption(struct config_generic * record, bool use_units);
3361 static bool validate_option_array_item(const char *name, const char *value,
3362 bool skipIfNoPermissions);
3366 * Some infrastructure for checking malloc/strdup/realloc calls
3369 guc_malloc(int elevel, size_t size)
3373 /* Avoid unportable behavior of malloc(0) */
3376 data = malloc(size);
3379 (errcode(ERRCODE_OUT_OF_MEMORY),
3380 errmsg("out of memory")));
3385 guc_realloc(int elevel, void *old, size_t size)
3389 /* Avoid unportable behavior of realloc(NULL, 0) */
3390 if (old == NULL && size == 0)
3392 data = realloc(old, size);
3395 (errcode(ERRCODE_OUT_OF_MEMORY),
3396 errmsg("out of memory")));
3401 guc_strdup(int elevel, const char *src)
3408 (errcode(ERRCODE_OUT_OF_MEMORY),
3409 errmsg("out of memory")));
3415 * Detect whether strval is referenced anywhere in a GUC string item
3418 string_field_used(struct config_string * conf, char *strval)
3422 if (strval == *(conf->variable) ||
3423 strval == conf->reset_val ||
3424 strval == conf->boot_val)
3426 for (stack = conf->gen.stack; stack; stack = stack->prev)
3428 if (strval == stack->prior.val.stringval ||
3429 strval == stack->masked.val.stringval)
3436 * Support for assigning to a field of a string GUC item. Free the prior
3437 * value if it's not referenced anywhere else in the item (including stacked
3441 set_string_field(struct config_string * conf, char **field, char *newval)
3443 char *oldval = *field;
3445 /* Do the assignment */
3448 /* Free old value if it's not NULL and isn't referenced anymore */
3449 if (oldval && !string_field_used(conf, oldval))
3454 * Detect whether an "extra" struct is referenced anywhere in a GUC item
3457 extra_field_used(struct config_generic * gconf, void *extra)
3461 if (extra == gconf->extra)
3463 switch (gconf->vartype)
3466 if (extra == ((struct config_bool *) gconf)->reset_extra)
3470 if (extra == ((struct config_int *) gconf)->reset_extra)
3474 if (extra == ((struct config_real *) gconf)->reset_extra)
3478 if (extra == ((struct config_string *) gconf)->reset_extra)
3482 if (extra == ((struct config_enum *) gconf)->reset_extra)
3486 for (stack = gconf->stack; stack; stack = stack->prev)
3488 if (extra == stack->prior.extra ||
3489 extra == stack->masked.extra)
3497 * Support for assigning to an "extra" field of a GUC item. Free the prior
3498 * value if it's not referenced anywhere else in the item (including stacked
3502 set_extra_field(struct config_generic * gconf, void **field, void *newval)
3504 void *oldval = *field;
3506 /* Do the assignment */
3509 /* Free old value if it's not NULL and isn't referenced anymore */
3510 if (oldval && !extra_field_used(gconf, oldval))
3515 * Support for copying a variable's active value into a stack entry.
3516 * The "extra" field associated with the active value is copied, too.
3518 * NB: be sure stringval and extra fields of a new stack entry are
3519 * initialized to NULL before this is used, else we'll try to free() them.
3522 set_stack_value(struct config_generic * gconf, config_var_value *val)
3524 switch (gconf->vartype)
3528 *((struct config_bool *) gconf)->variable;
3532 *((struct config_int *) gconf)->variable;
3536 *((struct config_real *) gconf)->variable;
3539 set_string_field((struct config_string *) gconf,
3540 &(val->val.stringval),
3541 *((struct config_string *) gconf)->variable);
3545 *((struct config_enum *) gconf)->variable;
3548 set_extra_field(gconf, &(val->extra), gconf->extra);
3552 * Support for discarding a no-longer-needed value in a stack entry.
3553 * The "extra" field associated with the stack entry is cleared, too.
3556 discard_stack_value(struct config_generic * gconf, config_var_value *val)
3558 switch (gconf->vartype)
3564 /* no need to do anything */
3567 set_string_field((struct config_string *) gconf,
3568 &(val->val.stringval),
3572 set_extra_field(gconf, &(val->extra), NULL);
3577 * Fetch the sorted array pointer (exported for help_config.c's use ONLY)
3579 struct config_generic **
3580 get_guc_variables(void)
3582 return guc_variables;
3587 * Build the sorted array. This is split out so that it could be
3588 * re-executed after startup (eg, we could allow loadable modules to
3589 * add vars, and then we'd need to re-sort).
3592 build_guc_variables(void)
3596 struct config_generic **guc_vars;
3599 for (i = 0; ConfigureNamesBool[i].gen.name; i++)
3601 struct config_bool *conf = &ConfigureNamesBool[i];
3603 /* Rather than requiring vartype to be filled in by hand, do this: */
3604 conf->gen.vartype = PGC_BOOL;
3608 for (i = 0; ConfigureNamesInt[i].gen.name; i++)
3610 struct config_int *conf = &ConfigureNamesInt[i];
3612 conf->gen.vartype = PGC_INT;
3616 for (i = 0; ConfigureNamesReal[i].gen.name; i++)
3618 struct config_real *conf = &ConfigureNamesReal[i];
3620 conf->gen.vartype = PGC_REAL;
3624 for (i = 0; ConfigureNamesString[i].gen.name; i++)
3626 struct config_string *conf = &ConfigureNamesString[i];
3628 conf->gen.vartype = PGC_STRING;
3632 for (i = 0; ConfigureNamesEnum[i].gen.name; i++)
3634 struct config_enum *conf = &ConfigureNamesEnum[i];
3636 conf->gen.vartype = PGC_ENUM;
3641 * Create table with 20% slack
3643 size_vars = num_vars + num_vars / 4;
3645 guc_vars = (struct config_generic **)
3646 guc_malloc(FATAL, size_vars * sizeof(struct config_generic *));
3650 for (i = 0; ConfigureNamesBool[i].gen.name; i++)
3651 guc_vars[num_vars++] = &ConfigureNamesBool[i].gen;
3653 for (i = 0; ConfigureNamesInt[i].gen.name; i++)
3654 guc_vars[num_vars++] = &ConfigureNamesInt[i].gen;
3656 for (i = 0; ConfigureNamesReal[i].gen.name; i++)
3657 guc_vars[num_vars++] = &ConfigureNamesReal[i].gen;
3659 for (i = 0; ConfigureNamesString[i].gen.name; i++)
3660 guc_vars[num_vars++] = &ConfigureNamesString[i].gen;
3662 for (i = 0; ConfigureNamesEnum[i].gen.name; i++)
3663 guc_vars[num_vars++] = &ConfigureNamesEnum[i].gen;
3666 free(guc_variables);
3667 guc_variables = guc_vars;
3668 num_guc_variables = num_vars;
3669 size_guc_variables = size_vars;
3670 qsort((void *) guc_variables, num_guc_variables,
3671 sizeof(struct config_generic *), guc_var_compare);
3675 * Add a new GUC variable to the list of known variables. The
3676 * list is expanded if needed.
3679 add_guc_variable(struct config_generic * var, int elevel)
3681 if (num_guc_variables + 1 >= size_guc_variables)
3684 * Increase the vector by 25%
3686 int size_vars = size_guc_variables + size_guc_variables / 4;
3687 struct config_generic **guc_vars;
3692 guc_vars = (struct config_generic **)
3693 guc_malloc(elevel, size_vars * sizeof(struct config_generic *));
3697 guc_vars = (struct config_generic **)
3698 guc_realloc(elevel, guc_variables, size_vars * sizeof(struct config_generic *));
3701 if (guc_vars == NULL)
3702 return false; /* out of memory */
3704 guc_variables = guc_vars;
3705 size_guc_variables = size_vars;
3707 guc_variables[num_guc_variables++] = var;
3708 qsort((void *) guc_variables, num_guc_variables,
3709 sizeof(struct config_generic *), guc_var_compare);
3714 * Create and add a placeholder variable for a custom variable name.
3716 static struct config_generic *
3717 add_placeholder_variable(const char *name, int elevel)
3719 size_t sz = sizeof(struct config_string) + sizeof(char *);
3720 struct config_string *var;
3721 struct config_generic *gen;
3723 var = (struct config_string *) guc_malloc(elevel, sz);
3729 gen->name = guc_strdup(elevel, name);
3730 if (gen->name == NULL)
3736 gen->context = PGC_USERSET;
3737 gen->group = CUSTOM_OPTIONS;
3738 gen->short_desc = "GUC placeholder variable";
3739 gen->flags = GUC_NO_SHOW_ALL | GUC_NOT_IN_SAMPLE | GUC_CUSTOM_PLACEHOLDER;
3740 gen->vartype = PGC_STRING;
3743 * The char* is allocated at the end of the struct since we have no
3744 * 'static' place to point to. Note that the current value, as well as
3745 * the boot and reset values, start out NULL.
3747 var->variable = (char **) (var + 1);
3749 if (!add_guc_variable((struct config_generic *) var, elevel))
3751 free((void *) gen->name);
3760 * Look up option NAME. If it exists, return a pointer to its record,
3761 * else return NULL. If create_placeholders is TRUE, we'll create a
3762 * placeholder record for a valid-looking custom variable name.
3764 static struct config_generic *
3765 find_option(const char *name, bool create_placeholders, int elevel)
3767 const char **key = &name;
3768 struct config_generic **res;
3774 * By equating const char ** with struct config_generic *, we are assuming
3775 * the name field is first in config_generic.
3777 res = (struct config_generic **) bsearch((void *) &key,
3778 (void *) guc_variables,
3780 sizeof(struct config_generic *),
3786 * See if the name is an obsolete name for a variable. We assume that the
3787 * set of supported old names is short enough that a brute-force search is
3790 for (i = 0; map_old_guc_names[i] != NULL; i += 2)
3792 if (guc_name_compare(name, map_old_guc_names[i]) == 0)
3793 return find_option(map_old_guc_names[i + 1], false, elevel);
3796 if (create_placeholders)
3799 * Check if the name is qualified, and if so, add a placeholder.
3801 if (strchr(name, GUC_QUALIFIER_SEPARATOR) != NULL)
3802 return add_placeholder_variable(name, elevel);
3811 * comparator for qsorting and bsearching guc_variables array
3814 guc_var_compare(const void *a, const void *b)
3816 const struct config_generic *confa = *(struct config_generic * const *) a;
3817 const struct config_generic *confb = *(struct config_generic * const *) b;
3819 return guc_name_compare(confa->name, confb->name);
3823 * the bare comparison function for GUC names
3826 guc_name_compare(const char *namea, const char *nameb)
3829 * The temptation to use strcasecmp() here must be resisted, because the
3830 * array ordering has to remain stable across setlocale() calls. So, build
3831 * our own with a simple ASCII-only downcasing.
3833 while (*namea && *nameb)
3835 char cha = *namea++;
3836 char chb = *nameb++;
3838 if (cha >= 'A' && cha <= 'Z')
3840 if (chb >= 'A' && chb <= 'Z')
3846 return 1; /* a is longer */
3848 return -1; /* b is longer */
3854 * Initialize GUC options during program startup.
3856 * Note that we cannot read the config file yet, since we have not yet
3857 * processed command-line switches.
3860 InitializeGUCOptions(void)
3865 * Before log_line_prefix could possibly receive a nonempty setting, make
3866 * sure that timezone processing is minimally alive (see elog.c).
3868 pg_timezone_initialize();
3871 * Build sorted array of all GUC variables.
3873 build_guc_variables();
3876 * Load all variables with their compiled-in defaults, and initialize
3877 * status fields as needed.
3879 for (i = 0; i < num_guc_variables; i++)
3881 InitializeOneGUCOption(guc_variables[i]);
3886 reporting_enabled = false;
3889 * Prevent any attempt to override the transaction modes from
3890 * non-interactive sources.
3892 SetConfigOption("transaction_isolation", "default",
3893 PGC_POSTMASTER, PGC_S_OVERRIDE);
3894 SetConfigOption("transaction_read_only", "no",
3895 PGC_POSTMASTER, PGC_S_OVERRIDE);
3896 SetConfigOption("transaction_deferrable", "no",
3897 PGC_POSTMASTER, PGC_S_OVERRIDE);
3900 * For historical reasons, some GUC parameters can receive defaults from
3901 * environment variables. Process those settings.
3903 InitializeGUCOptionsFromEnvironment();
3907 * Assign any GUC values that can come from the server's environment.
3909 * This is called from InitializeGUCOptions, and also from ProcessConfigFile
3910 * to deal with the possibility that a setting has been removed from
3911 * postgresql.conf and should now get a value from the environment.
3912 * (The latter is a kludge that should probably go away someday; if so,
3913 * fold this back into InitializeGUCOptions.)
3916 InitializeGUCOptionsFromEnvironment(void)
3921 env = getenv("PGPORT");
3923 SetConfigOption("port", env, PGC_POSTMASTER, PGC_S_ENV_VAR);
3925 env = getenv("PGDATESTYLE");
3927 SetConfigOption("datestyle", env, PGC_POSTMASTER, PGC_S_ENV_VAR);
3929 env = getenv("PGCLIENTENCODING");
3931 SetConfigOption("client_encoding", env, PGC_POSTMASTER, PGC_S_ENV_VAR);
3934 * rlimit isn't exactly an "environment variable", but it behaves about
3935 * the same. If we can identify the platform stack depth rlimit, increase
3936 * default stack depth setting up to whatever is safe (but at most 2MB).
3938 stack_rlimit = get_stack_depth_rlimit();
3939 if (stack_rlimit > 0)
3941 long new_limit = (stack_rlimit - STACK_DEPTH_SLOP) / 1024L;
3943 if (new_limit > 100)
3947 new_limit = Min(new_limit, 2048);
3948 sprintf(limbuf, "%ld", new_limit);
3949 SetConfigOption("max_stack_depth", limbuf,
3950 PGC_POSTMASTER, PGC_S_ENV_VAR);
3956 * Initialize one GUC option variable to its compiled-in default.
3958 * Note: the reason for calling check_hooks is not that we think the boot_val
3959 * might fail, but that the hooks might wish to compute an "extra" struct.
3962 InitializeOneGUCOption(struct config_generic * gconf)
3965 gconf->source = PGC_S_DEFAULT;
3966 gconf->reset_source = PGC_S_DEFAULT;
3967 gconf->scontext = PGC_INTERNAL;
3968 gconf->reset_scontext = PGC_INTERNAL;
3969 gconf->stack = NULL;
3970 gconf->extra = NULL;
3971 gconf->sourcefile = NULL;
3972 gconf->sourceline = 0;
3974 switch (gconf->vartype)
3978 struct config_bool *conf = (struct config_bool *) gconf;
3979 bool newval = conf->boot_val;
3982 if (!call_bool_check_hook(conf, &newval, &extra,
3983 PGC_S_DEFAULT, LOG))
3984 elog(FATAL, "failed to initialize %s to %d",
3985 conf->gen.name, (int) newval);
3986 if (conf->assign_hook)
3987 (*conf->assign_hook) (newval, extra);
3988 *conf->variable = conf->reset_val = newval;
3989 conf->gen.extra = conf->reset_extra = extra;
3994 struct config_int *conf = (struct config_int *) gconf;
3995 int newval = conf->boot_val;
3998 Assert(newval >= conf->min);
3999 Assert(newval <= conf->max);
4000 if (!call_int_check_hook(conf, &newval, &extra,
4001 PGC_S_DEFAULT, LOG))
4002 elog(FATAL, "failed to initialize %s to %d",
4003 conf->gen.name, newval);
4004 if (conf->assign_hook)
4005 (*conf->assign_hook) (newval, extra);
4006 *conf->variable = conf->reset_val = newval;
4007 conf->gen.extra = conf->reset_extra = extra;
4012 struct config_real *conf = (struct config_real *) gconf;
4013 double newval = conf->boot_val;
4016 Assert(newval >= conf->min);
4017 Assert(newval <= conf->max);
4018 if (!call_real_check_hook(conf, &newval, &extra,
4019 PGC_S_DEFAULT, LOG))
4020 elog(FATAL, "failed to initialize %s to %g",
4021 conf->gen.name, newval);
4022 if (conf->assign_hook)
4023 (*conf->assign_hook) (newval, extra);
4024 *conf->variable = conf->reset_val = newval;
4025 conf->gen.extra = conf->reset_extra = extra;
4030 struct config_string *conf = (struct config_string *) gconf;
4034 /* non-NULL boot_val must always get strdup'd */
4035 if (conf->boot_val != NULL)
4036 newval = guc_strdup(FATAL, conf->boot_val);
4040 if (!call_string_check_hook(conf, &newval, &extra,
4041 PGC_S_DEFAULT, LOG))
4042 elog(FATAL, "failed to initialize %s to \"%s\"",
4043 conf->gen.name, newval ? newval : "");
4044 if (conf->assign_hook)
4045 (*conf->assign_hook) (newval, extra);
4046 *conf->variable = conf->reset_val = newval;
4047 conf->gen.extra = conf->reset_extra = extra;
4052 struct config_enum *conf = (struct config_enum *) gconf;
4053 int newval = conf->boot_val;
4056 if (!call_enum_check_hook(conf, &newval, &extra,
4057 PGC_S_DEFAULT, LOG))
4058 elog(FATAL, "failed to initialize %s to %d",
4059 conf->gen.name, newval);
4060 if (conf->assign_hook)
4061 (*conf->assign_hook) (newval, extra);
4062 *conf->variable = conf->reset_val = newval;
4063 conf->gen.extra = conf->reset_extra = extra;
4071 * Select the configuration files and data directory to be used, and
4072 * do the initial read of postgresql.conf.
4074 * This is called after processing command-line switches.
4075 * userDoption is the -D switch value if any (NULL if unspecified).
4076 * progname is just for use in error messages.
4078 * Returns true on success; on failure, prints a suitable error message
4079 * to stderr and returns false.
4082 SelectConfigFiles(const char *userDoption, const char *progname)
4086 struct stat stat_buf;
4088 /* configdir is -D option, or $PGDATA if no -D */
4090 configdir = make_absolute_path(userDoption);
4092 configdir = make_absolute_path(getenv("PGDATA"));
4095 * Find the configuration file: if config_file was specified on the
4096 * command line, use it, else use configdir/postgresql.conf. In any case
4097 * ensure the result is an absolute path, so that it will be interpreted
4098 * the same way by future backends.
4101 fname = make_absolute_path(ConfigFileName);
4104 fname = guc_malloc(FATAL,
4105 strlen(configdir) + strlen(CONFIG_FILENAME) + 2);
4106 sprintf(fname, "%s/%s", configdir, CONFIG_FILENAME);
4110 write_stderr("%s does not know where to find the server configuration file.\n"
4111 "You must specify the --config-file or -D invocation "
4112 "option or set the PGDATA environment variable.\n",
4118 * Set the ConfigFileName GUC variable to its final value, ensuring that
4119 * it can't be overridden later.
4121 SetConfigOption("config_file", fname, PGC_POSTMASTER, PGC_S_OVERRIDE);
4125 * Now read the config file for the first time.
4127 if (stat(ConfigFileName, &stat_buf) != 0)
4129 write_stderr("%s cannot access the server configuration file \"%s\": %s\n",
4130 progname, ConfigFileName, strerror(errno));
4135 ProcessConfigFile(PGC_POSTMASTER);
4138 * If the data_directory GUC variable has been set, use that as DataDir;
4139 * otherwise use configdir if set; else punt.
4141 * Note: SetDataDir will copy and absolute-ize its argument, so we don't
4145 SetDataDir(data_directory);
4147 SetDataDir(configdir);
4150 write_stderr("%s does not know where to find the database system data.\n"
4151 "This can be specified as \"data_directory\" in \"%s\", "
4152 "or by the -D invocation option, or by the "
4153 "PGDATA environment variable.\n",
4154 progname, ConfigFileName);
4159 * Reflect the final DataDir value back into the data_directory GUC var.
4160 * (If you are wondering why we don't just make them a single variable,
4161 * it's because the EXEC_BACKEND case needs DataDir to be transmitted to
4162 * child backends specially. XXX is that still true? Given that we now
4163 * chdir to DataDir, EXEC_BACKEND can read the config file without knowing
4164 * DataDir in advance.)
4166 SetConfigOption("data_directory", DataDir, PGC_POSTMASTER, PGC_S_OVERRIDE);
4169 * If timezone_abbreviations wasn't set in the configuration file, install
4170 * the default value. We do it this way because we can't safely install a
4171 * "real" value until my_exec_path is set, which may not have happened
4172 * when InitializeGUCOptions runs, so the bootstrap default value cannot
4173 * be the real desired default.
4175 pg_timezone_abbrev_initialize();
4178 * Figure out where pg_hba.conf is, and make sure the path is absolute.
4181 fname = make_absolute_path(HbaFileName);
4184 fname = guc_malloc(FATAL,
4185 strlen(configdir) + strlen(HBA_FILENAME) + 2);
4186 sprintf(fname, "%s/%s", configdir, HBA_FILENAME);
4190 write_stderr("%s does not know where to find the \"hba\" configuration file.\n"
4191 "This can be specified as \"hba_file\" in \"%s\", "
4192 "or by the -D invocation option, or by the "
4193 "PGDATA environment variable.\n",
4194 progname, ConfigFileName);
4197 SetConfigOption("hba_file", fname, PGC_POSTMASTER, PGC_S_OVERRIDE);
4201 * Likewise for pg_ident.conf.
4204 fname = make_absolute_path(IdentFileName);
4207 fname = guc_malloc(FATAL,
4208 strlen(configdir) + strlen(IDENT_FILENAME) + 2);
4209 sprintf(fname, "%s/%s", configdir, IDENT_FILENAME);
4213 write_stderr("%s does not know where to find the \"ident\" configuration file.\n"
4214 "This can be specified as \"ident_file\" in \"%s\", "
4215 "or by the -D invocation option, or by the "
4216 "PGDATA environment variable.\n",
4217 progname, ConfigFileName);
4220 SetConfigOption("ident_file", fname, PGC_POSTMASTER, PGC_S_OVERRIDE);
4230 * Reset all options to their saved default values (implements RESET ALL)
4233 ResetAllOptions(void)
4237 for (i = 0; i < num_guc_variables; i++)
4239 struct config_generic *gconf = guc_variables[i];
4241 /* Don't reset non-SET-able values */
4242 if (gconf->context != PGC_SUSET &&
4243 gconf->context != PGC_USERSET)
4245 /* Don't reset if special exclusion from RESET ALL */
4246 if (gconf->flags & GUC_NO_RESET_ALL)
4248 /* No need to reset if wasn't SET */
4249 if (gconf->source <= PGC_S_OVERRIDE)
4252 /* Save old value to support transaction abort */
4253 push_old_value(gconf, GUC_ACTION_SET);
4255 switch (gconf->vartype)
4259 struct config_bool *conf = (struct config_bool *) gconf;
4261 if (conf->assign_hook)
4262 (*conf->assign_hook) (conf->reset_val,
4264 *conf->variable = conf->reset_val;
4265 set_extra_field(&conf->gen, &conf->gen.extra,
4271 struct config_int *conf = (struct config_int *) gconf;
4273 if (conf->assign_hook)
4274 (*conf->assign_hook) (conf->reset_val,
4276 *conf->variable = conf->reset_val;
4277 set_extra_field(&conf->gen, &conf->gen.extra,
4283 struct config_real *conf = (struct config_real *) gconf;
4285 if (conf->assign_hook)
4286 (*conf->assign_hook) (conf->reset_val,
4288 *conf->variable = conf->reset_val;
4289 set_extra_field(&conf->gen, &conf->gen.extra,
4295 struct config_string *conf = (struct config_string *) gconf;
4297 if (conf->assign_hook)
4298 (*conf->assign_hook) (conf->reset_val,
4300 set_string_field(conf, conf->variable, conf->reset_val);
4301 set_extra_field(&conf->gen, &conf->gen.extra,
4307 struct config_enum *conf = (struct config_enum *) gconf;
4309 if (conf->assign_hook)
4310 (*conf->assign_hook) (conf->reset_val,
4312 *conf->variable = conf->reset_val;
4313 set_extra_field(&conf->gen, &conf->gen.extra,
4319 gconf->source = gconf->reset_source;
4320 gconf->scontext = gconf->reset_scontext;
4322 if (gconf->flags & GUC_REPORT)
4323 ReportGUCOption(gconf);
4330 * Push previous state during transactional assignment to a GUC variable.
4333 push_old_value(struct config_generic * gconf, GucAction action)
4337 /* If we're not inside a nest level, do nothing */
4338 if (GUCNestLevel == 0)
4341 /* Do we already have a stack entry of the current nest level? */
4342 stack = gconf->stack;
4343 if (stack && stack->nest_level >= GUCNestLevel)
4345 /* Yes, so adjust its state if necessary */
4346 Assert(stack->nest_level == GUCNestLevel);
4349 case GUC_ACTION_SET:
4350 /* SET overrides any prior action at same nest level */
4351 if (stack->state == GUC_SET_LOCAL)
4353 /* must discard old masked value */
4354 discard_stack_value(gconf, &stack->masked);
4356 stack->state = GUC_SET;
4358 case GUC_ACTION_LOCAL:
4359 if (stack->state == GUC_SET)
4361 /* SET followed by SET LOCAL, remember SET's value */
4362 stack->masked_scontext = gconf->scontext;
4363 set_stack_value(gconf, &stack->masked);
4364 stack->state = GUC_SET_LOCAL;
4366 /* in all other cases, no change to stack entry */
4368 case GUC_ACTION_SAVE:
4369 /* Could only have a prior SAVE of same variable */
4370 Assert(stack->state == GUC_SAVE);
4373 Assert(guc_dirty); /* must be set already */
4378 * Push a new stack entry
4380 * We keep all the stack entries in TopTransactionContext for simplicity.
4382 stack = (GucStack *) MemoryContextAllocZero(TopTransactionContext,
4385 stack->prev = gconf->stack;
4386 stack->nest_level = GUCNestLevel;
4389 case GUC_ACTION_SET:
4390 stack->state = GUC_SET;
4392 case GUC_ACTION_LOCAL:
4393 stack->state = GUC_LOCAL;
4395 case GUC_ACTION_SAVE:
4396 stack->state = GUC_SAVE;
4399 stack->source = gconf->source;
4400 stack->scontext = gconf->scontext;
4401 set_stack_value(gconf, &stack->prior);
4403 gconf->stack = stack;
4405 /* Ensure we remember to pop at end of xact */
4411 * Do GUC processing at main transaction start.
4417 * The nest level should be 0 between transactions; if it isn't, somebody
4418 * didn't call AtEOXact_GUC, or called it with the wrong nestLevel. We
4419 * throw a warning but make no other effort to clean up.
4421 if (GUCNestLevel != 0)
4422 elog(WARNING, "GUC nest level = %d at transaction start",
4428 * Enter a new nesting level for GUC values. This is called at subtransaction
4429 * start, and when entering a function that has proconfig settings, and in
4430 * some other places where we want to set GUC variables transiently.
4431 * NOTE we must not risk error here, else subtransaction start will be unhappy.
4434 NewGUCNestLevel(void)
4436 return ++GUCNestLevel;
4440 * Do GUC processing at transaction or subtransaction commit or abort, or
4441 * when exiting a function that has proconfig settings, or when undoing a
4442 * transient assignment to some GUC variables. (The name is thus a bit of
4443 * a misnomer; perhaps it should be ExitGUCNestLevel or some such.)
4444 * During abort, we discard all GUC settings that were applied at nesting
4445 * levels >= nestLevel. nestLevel == 1 corresponds to the main transaction.
4448 AtEOXact_GUC(bool isCommit, int nestLevel)
4454 * Note: it's possible to get here with GUCNestLevel == nestLevel-1 during
4455 * abort, if there is a failure during transaction start before
4456 * AtStart_GUC is called.
4458 Assert(nestLevel > 0 &&
4459 (nestLevel <= GUCNestLevel ||
4460 (nestLevel == GUCNestLevel + 1 && !isCommit)));
4462 /* Quick exit if nothing's changed in this transaction */
4465 GUCNestLevel = nestLevel - 1;
4469 still_dirty = false;
4470 for (i = 0; i < num_guc_variables; i++)
4472 struct config_generic *gconf = guc_variables[i];
4476 * Process and pop each stack entry within the nest level. To simplify
4477 * fmgr_security_definer() and other places that use GUC_ACTION_SAVE,
4478 * we allow failure exit from code that uses a local nest level to be
4479 * recovered at the surrounding transaction or subtransaction abort;
4480 * so there could be more than one stack entry to pop.
4482 while ((stack = gconf->stack) != NULL &&
4483 stack->nest_level >= nestLevel)
4485 GucStack *prev = stack->prev;
4486 bool restorePrior = false;
4487 bool restoreMasked = false;
4491 * In this next bit, if we don't set either restorePrior or
4492 * restoreMasked, we must "discard" any unwanted fields of the
4493 * stack entries to avoid leaking memory. If we do set one of
4494 * those flags, unused fields will be cleaned up after restoring.
4496 if (!isCommit) /* if abort, always restore prior value */
4497 restorePrior = true;
4498 else if (stack->state == GUC_SAVE)
4499 restorePrior = true;
4500 else if (stack->nest_level == 1)
4502 /* transaction commit */
4503 if (stack->state == GUC_SET_LOCAL)
4504 restoreMasked = true;
4505 else if (stack->state == GUC_SET)
4507 /* we keep the current active value */
4508 discard_stack_value(gconf, &stack->prior);
4510 else /* must be GUC_LOCAL */
4511 restorePrior = true;
4513 else if (prev == NULL ||
4514 prev->nest_level < stack->nest_level - 1)
4516 /* decrement entry's level and do not pop it */
4517 stack->nest_level--;
4523 * We have to merge this stack entry into prev. See README for
4524 * discussion of this bit.
4526 switch (stack->state)
4529 Assert(false); /* can't get here */
4532 /* next level always becomes SET */
4533 discard_stack_value(gconf, &stack->prior);
4534 if (prev->state == GUC_SET_LOCAL)
4535 discard_stack_value(gconf, &prev->masked);
4536 prev->state = GUC_SET;
4540 if (prev->state == GUC_SET)
4542 /* LOCAL migrates down */
4543 prev->masked_scontext = stack->scontext;
4544 prev->masked = stack->prior;
4545 prev->state = GUC_SET_LOCAL;
4549 /* else just forget this stack level */
4550 discard_stack_value(gconf, &stack->prior);
4555 /* prior state at this level no longer wanted */
4556 discard_stack_value(gconf, &stack->prior);
4557 /* copy down the masked state */
4558 prev->masked_scontext = stack->masked_scontext;
4559 if (prev->state == GUC_SET_LOCAL)
4560 discard_stack_value(gconf, &prev->masked);
4561 prev->masked = stack->masked;
4562 prev->state = GUC_SET_LOCAL;
4569 if (restorePrior || restoreMasked)
4571 /* Perform appropriate restoration of the stacked value */
4572 config_var_value newvalue;
4573 GucSource newsource;
4574 GucContext newscontext;
4578 newvalue = stack->masked;
4579 newsource = PGC_S_SESSION;
4580 newscontext = stack->masked_scontext;
4584 newvalue = stack->prior;
4585 newsource = stack->source;
4586 newscontext = stack->scontext;
4589 switch (gconf->vartype)
4593 struct config_bool *conf = (struct config_bool *) gconf;
4594 bool newval = newvalue.val.boolval;
4595 void *newextra = newvalue.extra;
4597 if (*conf->variable != newval ||
4598 conf->gen.extra != newextra)
4600 if (conf->assign_hook)
4601 (*conf->assign_hook) (newval, newextra);
4602 *conf->variable = newval;
4603 set_extra_field(&conf->gen, &conf->gen.extra,
4611 struct config_int *conf = (struct config_int *) gconf;
4612 int newval = newvalue.val.intval;
4613 void *newextra = newvalue.extra;
4615 if (*conf->variable != newval ||
4616 conf->gen.extra != newextra)
4618 if (conf->assign_hook)
4619 (*conf->assign_hook) (newval, newextra);
4620 *conf->variable = newval;
4621 set_extra_field(&conf->gen, &conf->gen.extra,
4629 struct config_real *conf = (struct config_real *) gconf;
4630 double newval = newvalue.val.realval;
4631 void *newextra = newvalue.extra;
4633 if (*conf->variable != newval ||
4634 conf->gen.extra != newextra)
4636 if (conf->assign_hook)
4637 (*conf->assign_hook) (newval, newextra);
4638 *conf->variable = newval;
4639 set_extra_field(&conf->gen, &conf->gen.extra,
4647 struct config_string *conf = (struct config_string *) gconf;
4648 char *newval = newvalue.val.stringval;
4649 void *newextra = newvalue.extra;
4651 if (*conf->variable != newval ||
4652 conf->gen.extra != newextra)
4654 if (conf->assign_hook)
4655 (*conf->assign_hook) (newval, newextra);
4656 set_string_field(conf, conf->variable, newval);
4657 set_extra_field(&conf->gen, &conf->gen.extra,
4663 * Release stacked values if not used anymore. We
4664 * could use discard_stack_value() here, but since
4665 * we have type-specific code anyway, might as
4668 set_string_field(conf, &stack->prior.val.stringval, NULL);
4669 set_string_field(conf, &stack->masked.val.stringval, NULL);
4674 struct config_enum *conf = (struct config_enum *) gconf;
4675 int newval = newvalue.val.enumval;
4676 void *newextra = newvalue.extra;
4678 if (*conf->variable != newval ||
4679 conf->gen.extra != newextra)
4681 if (conf->assign_hook)
4682 (*conf->assign_hook) (newval, newextra);
4683 *conf->variable = newval;
4684 set_extra_field(&conf->gen, &conf->gen.extra,
4693 * Release stacked extra values if not used anymore.
4695 set_extra_field(gconf, &(stack->prior.extra), NULL);
4696 set_extra_field(gconf, &(stack->masked.extra), NULL);
4698 /* And restore source information */
4699 gconf->source = newsource;
4700 gconf->scontext = newscontext;
4703 /* Finish popping the state stack */
4704 gconf->stack = prev;
4707 /* Report new value if we changed it */
4708 if (changed && (gconf->flags & GUC_REPORT))
4709 ReportGUCOption(gconf);
4710 } /* end of stack-popping loop */
4716 /* If there are no remaining stack entries, we can reset guc_dirty */
4717 guc_dirty = still_dirty;
4719 /* Update nesting level */
4720 GUCNestLevel = nestLevel - 1;
4725 * Start up automatic reporting of changes to variables marked GUC_REPORT.
4726 * This is executed at completion of backend startup.
4729 BeginReportingGUCOptions(void)
4734 * Don't do anything unless talking to an interactive frontend of protocol
4737 if (whereToSendOutput != DestRemote ||
4738 PG_PROTOCOL_MAJOR(FrontendProtocol) < 3)
4741 reporting_enabled = true;
4743 /* Transmit initial values of interesting variables */
4744 for (i = 0; i < num_guc_variables; i++)
4746 struct config_generic *conf = guc_variables[i];
4748 if (conf->flags & GUC_REPORT)
4749 ReportGUCOption(conf);
4754 * ReportGUCOption: if appropriate, transmit option value to frontend
4757 ReportGUCOption(struct config_generic * record)
4759 if (reporting_enabled && (record->flags & GUC_REPORT))
4761 char *val = _ShowOption(record, false);
4762 StringInfoData msgbuf;
4764 pq_beginmessage(&msgbuf, 'S');
4765 pq_sendstring(&msgbuf, record->name);
4766 pq_sendstring(&msgbuf, val);
4767 pq_endmessage(&msgbuf);
4774 * Try to parse value as an integer. The accepted formats are the
4775 * usual decimal, octal, or hexadecimal formats, optionally followed by
4776 * a unit name if "flags" indicates a unit is allowed.
4778 * If the string parses okay, return true, else false.
4779 * If okay and result is not NULL, return the value in *result.
4780 * If not okay and hintmsg is not NULL, *hintmsg is set to a suitable
4781 * HINT message, or NULL if no hint provided.
4784 parse_int(const char *value, int *result, int flags, const char **hintmsg)
4789 /* To suppress compiler warnings, always set output params */
4795 /* We assume here that int64 is at least as wide as long */
4797 val = strtol(value, &endptr, 0);
4799 if (endptr == value)
4800 return false; /* no HINT for integer syntax error */
4802 if (errno == ERANGE || val != (int64) ((int32) val))
4805 *hintmsg = gettext_noop("Value exceeds integer range.");
4809 /* allow whitespace between integer and unit */
4810 while (isspace((unsigned char) *endptr))
4813 /* Handle possible unit */
4814 if (*endptr != '\0')
4817 * Note: the multiple-switch coding technique here is a bit tedious,
4818 * but seems necessary to avoid intermediate-value overflows.
4820 if (flags & GUC_UNIT_MEMORY)
4822 /* Set hint for use if no match or trailing garbage */
4824 *hintmsg = gettext_noop("Valid units for this parameter are \"kB\", \"MB\", and \"GB\".");
4826 #if BLCKSZ < 1024 || BLCKSZ > (1024*1024)
4827 #error BLCKSZ must be between 1KB and 1MB
4829 #if XLOG_BLCKSZ < 1024 || XLOG_BLCKSZ > (1024*1024)
4830 #error XLOG_BLCKSZ must be between 1KB and 1MB
4833 if (strncmp(endptr, "kB", 2) == 0)
4836 switch (flags & GUC_UNIT_MEMORY)
4838 case GUC_UNIT_BLOCKS:
4839 val /= (BLCKSZ / 1024);
4841 case GUC_UNIT_XBLOCKS:
4842 val /= (XLOG_BLCKSZ / 1024);
4846 else if (strncmp(endptr, "MB", 2) == 0)
4849 switch (flags & GUC_UNIT_MEMORY)
4854 case GUC_UNIT_BLOCKS:
4855 val *= KB_PER_MB / (BLCKSZ / 1024);
4857 case GUC_UNIT_XBLOCKS:
4858 val *= KB_PER_MB / (XLOG_BLCKSZ / 1024);
4862 else if (strncmp(endptr, "GB", 2) == 0)
4865 switch (flags & GUC_UNIT_MEMORY)
4870 case GUC_UNIT_BLOCKS:
4871 val *= KB_PER_GB / (BLCKSZ / 1024);
4873 case GUC_UNIT_XBLOCKS:
4874 val *= KB_PER_GB / (XLOG_BLCKSZ / 1024);
4879 else if (flags & GUC_UNIT_TIME)
4881 /* Set hint for use if no match or trailing garbage */
4883 *hintmsg = gettext_noop("Valid units for this parameter are \"ms\", \"s\", \"min\", \"h\", and \"d\".");
4885 if (strncmp(endptr, "ms", 2) == 0)
4888 switch (flags & GUC_UNIT_TIME)
4898 else if (strncmp(endptr, "s", 1) == 0)
4901 switch (flags & GUC_UNIT_TIME)
4911 else if (strncmp(endptr, "min", 3) == 0)
4914 switch (flags & GUC_UNIT_TIME)
4924 else if (strncmp(endptr, "h", 1) == 0)
4927 switch (flags & GUC_UNIT_TIME)
4940 else if (strncmp(endptr, "d", 1) == 0)
4943 switch (flags & GUC_UNIT_TIME)
4958 /* allow whitespace after unit */
4959 while (isspace((unsigned char) *endptr))
4962 if (*endptr != '\0')
4963 return false; /* appropriate hint, if any, already set */
4965 /* Check for overflow due to units conversion */
4966 if (val != (int64) ((int32) val))
4969 *hintmsg = gettext_noop("Value exceeds integer range.");
4975 *result = (int) val;
4982 * Try to parse value as a floating point number in the usual format.
4983 * If the string parses okay, return true, else false.
4984 * If okay and result is not NULL, return the value in *result.
4987 parse_real(const char *value, double *result)
4993 *result = 0; /* suppress compiler warning */
4996 val = strtod(value, &endptr);
4997 if (endptr == value || errno == ERANGE)
5000 /* allow whitespace after number */
5001 while (isspace((unsigned char) *endptr))
5003 if (*endptr != '\0')
5013 * Lookup the name for an enum option with the selected value.
5014 * Should only ever be called with known-valid values, so throws
5015 * an elog(ERROR) if the enum option is not found.
5017 * The returned string is a pointer to static data and not
5018 * allocated for modification.
5021 config_enum_lookup_by_value(struct config_enum * record, int val)
5023 const struct config_enum_entry *entry;
5025 for (entry = record->options; entry && entry->name; entry++)
5027 if (entry->val == val)
5031 elog(ERROR, "could not find enum option %d for %s",
5032 val, record->gen.name);
5033 return NULL; /* silence compiler */
5038 * Lookup the value for an enum option with the selected name
5039 * (case-insensitive).
5040 * If the enum option is found, sets the retval value and returns
5041 * true. If it's not found, return FALSE and retval is set to 0.
5044 config_enum_lookup_by_name(struct config_enum * record, const char *value,
5047 const struct config_enum_entry *entry;
5049 for (entry = record->options; entry && entry->name; entry++)
5051 if (pg_strcasecmp(value, entry->name) == 0)
5053 *retval = entry->val;
5064 * Return a list of all available options for an enum, excluding
5065 * hidden ones, separated by the given separator.
5066 * If prefix is non-NULL, it is added before the first enum value.
5067 * If suffix is non-NULL, it is added to the end of the string.
5070 config_enum_get_options(struct config_enum * record, const char *prefix,
5071 const char *suffix, const char *separator)
5073 const struct config_enum_entry *entry;
5074 StringInfoData retstr;
5077 initStringInfo(&retstr);
5078 appendStringInfoString(&retstr, prefix);
5080 seplen = strlen(separator);
5081 for (entry = record->options; entry && entry->name; entry++)
5085 appendStringInfoString(&retstr, entry->name);
5086 appendBinaryStringInfo(&retstr, separator, seplen);
5091 * All the entries may have been hidden, leaving the string empty if no
5092 * prefix was given. This indicates a broken GUC setup, since there is no
5093 * use for an enum without any values, so we just check to make sure we
5094 * don't write to invalid memory instead of actually trying to do
5095 * something smart with it.
5097 if (retstr.len >= seplen)
5099 /* Replace final separator */
5100 retstr.data[retstr.len - seplen] = '\0';
5101 retstr.len -= seplen;
5104 appendStringInfoString(&retstr, suffix);
5111 * Sets option `name' to given value.
5113 * The value should be a string, which will be parsed and converted to
5114 * the appropriate data type. The context and source parameters indicate
5115 * in which context this function is being called, so that it can apply the
5116 * access restrictions properly.
5118 * If value is NULL, set the option to its default value (normally the
5119 * reset_val, but if source == PGC_S_DEFAULT we instead use the boot_val).
5121 * action indicates whether to set the value globally in the session, locally
5122 * to the current top transaction, or just for the duration of a function call.
5124 * If changeVal is false then don't really set the option but do all
5125 * the checks to see if it would work.
5127 * elevel should normally be passed as zero, allowing this function to make
5128 * its standard choice of ereport level. However some callers need to be
5129 * able to override that choice; they should pass the ereport level to use.
5132 * +1: the value is valid and was successfully applied.
5133 * 0: the name or value is invalid (but see below).
5134 * -1: the value was not applied because of context, priority, or changeVal.
5136 * If there is an error (non-existing option, invalid value) then an
5137 * ereport(ERROR) is thrown *unless* this is called for a source for which
5138 * we don't want an ERROR (currently, those are defaults, the config file,
5139 * and per-database or per-user settings, as well as callers who specify
5140 * a less-than-ERROR elevel). In those cases we write a suitable error
5141 * message via ereport() and return 0.
5143 * See also SetConfigOption for an external interface.
5146 set_config_option(const char *name, const char *value,
5147 GucContext context, GucSource source,
5148 GucAction action, bool changeVal, int elevel)
5150 struct config_generic *record;
5151 bool prohibitValueChange = false;
5156 if (source == PGC_S_DEFAULT || source == PGC_S_FILE)
5159 * To avoid cluttering the log, only the postmaster bleats loudly
5160 * about problems with the config file.
5162 elevel = IsUnderPostmaster ? DEBUG3 : LOG;
5164 else if (source == PGC_S_GLOBAL || source == PGC_S_DATABASE || source == PGC_S_USER ||
5165 source == PGC_S_DATABASE_USER)
5171 record = find_option(name, true, elevel);
5175 (errcode(ERRCODE_UNDEFINED_OBJECT),
5176 errmsg("unrecognized configuration parameter \"%s\"", name)));
5181 * Check if the option can be set at this time. See guc.h for the precise
5184 switch (record->context)
5187 if (context != PGC_INTERNAL)
5190 (errcode(ERRCODE_CANT_CHANGE_RUNTIME_PARAM),
5191 errmsg("parameter \"%s\" cannot be changed",
5196 case PGC_POSTMASTER:
5197 if (context == PGC_SIGHUP)
5200 * We are re-reading a PGC_POSTMASTER variable from
5201 * postgresql.conf. We can't change the setting, so we should
5202 * give a warning if the DBA tries to change it. However,
5203 * because of variant formats, canonicalization by check
5204 * hooks, etc, we can't just compare the given string directly
5205 * to what's stored. Set a flag to check below after we have
5206 * the final storable value.
5208 prohibitValueChange = true;
5210 else if (context != PGC_POSTMASTER)
5213 (errcode(ERRCODE_CANT_CHANGE_RUNTIME_PARAM),
5214 errmsg("parameter \"%s\" cannot be changed without restarting the server",
5220 if (context != PGC_SIGHUP && context != PGC_POSTMASTER)
5223 (errcode(ERRCODE_CANT_CHANGE_RUNTIME_PARAM),
5224 errmsg("parameter \"%s\" cannot be changed now",
5230 * Hmm, the idea of the SIGHUP context is "ought to be global, but
5231 * can be changed after postmaster start". But there's nothing
5232 * that prevents a crafty administrator from sending SIGHUP
5233 * signals to individual backends only.
5237 if (context == PGC_SIGHUP)
5240 * If a PGC_BACKEND parameter is changed in the config file,
5241 * we want to accept the new value in the postmaster (whence
5242 * it will propagate to subsequently-started backends), but
5243 * ignore it in existing backends. This is a tad klugy, but
5244 * necessary because we don't re-read the config file during
5247 if (IsUnderPostmaster)
5250 else if (context != PGC_POSTMASTER && context != PGC_BACKEND &&
5251 source != PGC_S_CLIENT)
5254 (errcode(ERRCODE_CANT_CHANGE_RUNTIME_PARAM),
5255 errmsg("parameter \"%s\" cannot be set after connection start",
5261 if (context == PGC_USERSET || context == PGC_BACKEND)
5264 (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
5265 errmsg("permission denied to set parameter \"%s\"",
5276 * Disallow changing GUC_NOT_WHILE_SEC_REST values if we are inside a
5277 * security restriction context. We can reject this regardless of the GUC
5278 * context or source, mainly because sources that it might be reasonable
5279 * to override for won't be seen while inside a function.
5281 * Note: variables marked GUC_NOT_WHILE_SEC_REST should usually be marked
5282 * GUC_NO_RESET_ALL as well, because ResetAllOptions() doesn't check this.
5283 * An exception might be made if the reset value is assumed to be "safe".
5285 * Note: this flag is currently used for "session_authorization" and
5286 * "role". We need to prohibit changing these inside a local userid
5287 * context because when we exit it, GUC won't be notified, leaving things
5288 * out of sync. (This could be fixed by forcing a new GUC nesting level,
5289 * but that would change behavior in possibly-undesirable ways.) Also, we
5290 * prohibit changing these in a security-restricted operation because
5291 * otherwise RESET could be used to regain the session user's privileges.
5293 if (record->flags & GUC_NOT_WHILE_SEC_REST)
5295 if (InLocalUserIdChange())
5298 * Phrasing of this error message is historical, but it's the most
5302 (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
5303 errmsg("cannot set parameter \"%s\" within security-definer function",
5307 if (InSecurityRestrictedOperation())
5310 (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
5311 errmsg("cannot set parameter \"%s\" within security-restricted operation",
5318 * Should we set reset/stacked values? (If so, the behavior is not
5319 * transactional.) This is done either when we get a default value from
5320 * the database's/user's/client's default settings or when we reset a
5321 * value to its default.
5323 makeDefault = changeVal && (source <= PGC_S_OVERRIDE) &&
5324 ((value != NULL) || source == PGC_S_DEFAULT);
5327 * Ignore attempted set if overridden by previously processed setting.
5328 * However, if changeVal is false then plow ahead anyway since we are
5329 * trying to find out if the value is potentially good, not actually use
5330 * it. Also keep going if makeDefault is true, since we may want to set
5331 * the reset/stacked values even if we can't set the variable itself.
5333 if (record->source > source)
5335 if (changeVal && !makeDefault)
5337 elog(DEBUG3, "\"%s\": setting ignored because previous source is higher priority",
5345 * Evaluate value and set variable.
5347 switch (record->vartype)
5351 struct config_bool *conf = (struct config_bool *) record;
5353 void *newextra = NULL;
5357 if (!parse_bool(value, &newval))
5360 (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
5361 errmsg("parameter \"%s\" requires a Boolean value",
5365 if (!call_bool_check_hook(conf, &newval, &newextra,
5369 else if (source == PGC_S_DEFAULT)
5371 newval = conf->boot_val;
5372 if (!call_bool_check_hook(conf, &newval, &newextra,
5378 newval = conf->reset_val;
5379 newextra = conf->reset_extra;
5380 source = conf->gen.reset_source;
5381 context = conf->gen.reset_scontext;
5384 if (prohibitValueChange)
5386 if (*conf->variable != newval)
5389 (errcode(ERRCODE_CANT_CHANGE_RUNTIME_PARAM),
5390 errmsg("parameter \"%s\" cannot be changed without restarting the server",
5399 /* Save old value to support transaction abort */
5401 push_old_value(&conf->gen, action);
5403 if (conf->assign_hook)
5404 (*conf->assign_hook) (newval, newextra);
5405 *conf->variable = newval;
5406 set_extra_field(&conf->gen, &conf->gen.extra,
5408 conf->gen.source = source;
5409 conf->gen.scontext = context;
5415 if (conf->gen.reset_source <= source)
5417 conf->reset_val = newval;
5418 set_extra_field(&conf->gen, &conf->reset_extra,
5420 conf->gen.reset_source = source;
5421 conf->gen.reset_scontext = context;
5423 for (stack = conf->gen.stack; stack; stack = stack->prev)
5425 if (stack->source <= source)
5427 stack->prior.val.boolval = newval;
5428 set_extra_field(&conf->gen, &stack->prior.extra,
5430 stack->source = source;
5431 stack->scontext = context;
5436 /* Perhaps we didn't install newextra anywhere */
5437 if (newextra && !extra_field_used(&conf->gen, newextra))
5444 struct config_int *conf = (struct config_int *) record;
5446 void *newextra = NULL;
5450 const char *hintmsg;
5452 if (!parse_int(value, &newval, conf->gen.flags, &hintmsg))
5455 (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
5456 errmsg("invalid value for parameter \"%s\": \"%s\"",
5458 hintmsg ? errhint("%s", _(hintmsg)) : 0));
5461 if (newval < conf->min || newval > conf->max)
5464 (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
5465 errmsg("%d is outside the valid range for parameter \"%s\" (%d .. %d)",
5466 newval, name, conf->min, conf->max)));
5469 if (!call_int_check_hook(conf, &newval, &newextra,
5473 else if (source == PGC_S_DEFAULT)
5475 newval = conf->boot_val;
5476 if (!call_int_check_hook(conf, &newval, &newextra,
5482 newval = conf->reset_val;
5483 newextra = conf->reset_extra;
5484 source = conf->gen.reset_source;
5485 context = conf->gen.reset_scontext;
5488 if (prohibitValueChange)
5490 if (*conf->variable != newval)
5493 (errcode(ERRCODE_CANT_CHANGE_RUNTIME_PARAM),
5494 errmsg("parameter \"%s\" cannot be changed without restarting the server",
5503 /* Save old value to support transaction abort */
5505 push_old_value(&conf->gen, action);
5507 if (conf->assign_hook)
5508 (*conf->assign_hook) (newval, newextra);
5509 *conf->variable = newval;
5510 set_extra_field(&conf->gen, &conf->gen.extra,
5512 conf->gen.source = source;
5513 conf->gen.scontext = context;
5519 if (conf->gen.reset_source <= source)
5521 conf->reset_val = newval;
5522 set_extra_field(&conf->gen, &conf->reset_extra,
5524 conf->gen.reset_source = source;
5525 conf->gen.reset_scontext = context;
5527 for (stack = conf->gen.stack; stack; stack = stack->prev)
5529 if (stack->source <= source)
5531 stack->prior.val.intval = newval;
5532 set_extra_field(&conf->gen, &stack->prior.extra,
5534 stack->source = source;
5535 stack->scontext = context;
5540 /* Perhaps we didn't install newextra anywhere */
5541 if (newextra && !extra_field_used(&conf->gen, newextra))
5548 struct config_real *conf = (struct config_real *) record;
5550 void *newextra = NULL;
5554 if (!parse_real(value, &newval))
5557 (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
5558 errmsg("parameter \"%s\" requires a numeric value",
5562 if (newval < conf->min || newval > conf->max)
5565 (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
5566 errmsg("%g is outside the valid range for parameter \"%s\" (%g .. %g)",
5567 newval, name, conf->min, conf->max)));
5570 if (!call_real_check_hook(conf, &newval, &newextra,
5574 else if (source == PGC_S_DEFAULT)
5576 newval = conf->boot_val;
5577 if (!call_real_check_hook(conf, &newval, &newextra,
5583 newval = conf->reset_val;
5584 newextra = conf->reset_extra;
5585 source = conf->gen.reset_source;
5586 context = conf->gen.reset_scontext;
5589 if (prohibitValueChange)
5591 if (*conf->variable != newval)
5594 (errcode(ERRCODE_CANT_CHANGE_RUNTIME_PARAM),
5595 errmsg("parameter \"%s\" cannot be changed without restarting the server",
5604 /* Save old value to support transaction abort */
5606 push_old_value(&conf->gen, action);
5608 if (conf->assign_hook)
5609 (*conf->assign_hook) (newval, newextra);
5610 *conf->variable = newval;
5611 set_extra_field(&conf->gen, &conf->gen.extra,
5613 conf->gen.source = source;
5614 conf->gen.scontext = context;
5620 if (conf->gen.reset_source <= source)
5622 conf->reset_val = newval;
5623 set_extra_field(&conf->gen, &conf->reset_extra,
5625 conf->gen.reset_source = source;
5626 conf->gen.reset_scontext = context;
5628 for (stack = conf->gen.stack; stack; stack = stack->prev)
5630 if (stack->source <= source)
5632 stack->prior.val.realval = newval;
5633 set_extra_field(&conf->gen, &stack->prior.extra,
5635 stack->source = source;
5636 stack->scontext = context;
5641 /* Perhaps we didn't install newextra anywhere */
5642 if (newextra && !extra_field_used(&conf->gen, newextra))
5649 struct config_string *conf = (struct config_string *) record;
5651 void *newextra = NULL;
5656 * The value passed by the caller could be transient, so
5657 * we always strdup it.
5659 newval = guc_strdup(elevel, value);
5664 * The only built-in "parsing" check we have is to apply
5665 * truncation if GUC_IS_NAME.
5667 if (conf->gen.flags & GUC_IS_NAME)
5668 truncate_identifier(newval, strlen(newval), true);
5670 if (!call_string_check_hook(conf, &newval, &newextra,
5677 else if (source == PGC_S_DEFAULT)
5679 /* non-NULL boot_val must always get strdup'd */
5680 if (conf->boot_val != NULL)
5682 newval = guc_strdup(elevel, conf->boot_val);
5689 if (!call_string_check_hook(conf, &newval, &newextra,
5699 * strdup not needed, since reset_val is already under
5702 newval = conf->reset_val;
5703 newextra = conf->reset_extra;
5704 source = conf->gen.reset_source;
5705 context = conf->gen.reset_scontext;
5708 if (prohibitValueChange)
5710 /* newval shouldn't be NULL, so we're a bit sloppy here */
5711 if (*conf->variable == NULL || newval == NULL ||
5712 strcmp(*conf->variable, newval) != 0)
5715 (errcode(ERRCODE_CANT_CHANGE_RUNTIME_PARAM),
5716 errmsg("parameter \"%s\" cannot be changed without restarting the server",
5725 /* Save old value to support transaction abort */
5727 push_old_value(&conf->gen, action);
5729 if (conf->assign_hook)
5730 (*conf->assign_hook) (newval, newextra);
5731 set_string_field(conf, conf->variable, newval);
5732 set_extra_field(&conf->gen, &conf->gen.extra,
5734 conf->gen.source = source;
5735 conf->gen.scontext = context;
5742 if (conf->gen.reset_source <= source)
5744 set_string_field(conf, &conf->reset_val, newval);
5745 set_extra_field(&conf->gen, &conf->reset_extra,
5747 conf->gen.reset_source = source;
5748 conf->gen.reset_scontext = context;
5750 for (stack = conf->gen.stack; stack; stack = stack->prev)
5752 if (stack->source <= source)
5754 set_string_field(conf, &stack->prior.val.stringval,
5756 set_extra_field(&conf->gen, &stack->prior.extra,
5758 stack->source = source;
5759 stack->scontext = context;
5764 /* Perhaps we didn't install newval anywhere */
5765 if (newval && !string_field_used(conf, newval))
5767 /* Perhaps we didn't install newextra anywhere */
5768 if (newextra && !extra_field_used(&conf->gen, newextra))
5775 struct config_enum *conf = (struct config_enum *) record;
5777 void *newextra = NULL;
5781 if (!config_enum_lookup_by_name(conf, value, &newval))
5785 hintmsg = config_enum_get_options(conf,
5786 "Available values: ",
5790 (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
5791 errmsg("invalid value for parameter \"%s\": \"%s\"",
5793 hintmsg ? errhint("%s", _(hintmsg)) : 0));
5799 if (!call_enum_check_hook(conf, &newval, &newextra,
5803 else if (source == PGC_S_DEFAULT)
5805 newval = conf->boot_val;
5806 if (!call_enum_check_hook(conf, &newval, &newextra,
5812 newval = conf->reset_val;
5813 newextra = conf->reset_extra;
5814 source = conf->gen.reset_source;
5815 context = conf->gen.reset_scontext;
5818 if (prohibitValueChange)
5820 if (*conf->variable != newval)
5823 (errcode(ERRCODE_CANT_CHANGE_RUNTIME_PARAM),
5824 errmsg("parameter \"%s\" cannot be changed without restarting the server",
5833 /* Save old value to support transaction abort */
5835 push_old_value(&conf->gen, action);
5837 if (conf->assign_hook)
5838 (*conf->assign_hook) (newval, newextra);
5839 *conf->variable = newval;
5840 set_extra_field(&conf->gen, &conf->gen.extra,
5842 conf->gen.source = source;
5843 conf->gen.scontext = context;
5849 if (conf->gen.reset_source <= source)
5851 conf->reset_val = newval;
5852 set_extra_field(&conf->gen, &conf->reset_extra,
5854 conf->gen.reset_source = source;
5855 conf->gen.reset_scontext = context;
5857 for (stack = conf->gen.stack; stack; stack = stack->prev)
5859 if (stack->source <= source)
5861 stack->prior.val.enumval = newval;
5862 set_extra_field(&conf->gen, &stack->prior.extra,
5864 stack->source = source;
5865 stack->scontext = context;
5870 /* Perhaps we didn't install newextra anywhere */
5871 if (newextra && !extra_field_used(&conf->gen, newextra))
5877 if (changeVal && (record->flags & GUC_REPORT))
5878 ReportGUCOption(record);
5880 return changeVal ? 1 : -1;
5885 * Set the fields for source file and line number the setting came from.
5888 set_config_sourcefile(const char *name, char *sourcefile, int sourceline)
5890 struct config_generic *record;
5894 * To avoid cluttering the log, only the postmaster bleats loudly about
5895 * problems with the config file.
5897 elevel = IsUnderPostmaster ? DEBUG3 : LOG;
5899 record = find_option(name, true, elevel);
5900 /* should not happen */
5902 elog(ERROR, "unrecognized configuration parameter \"%s\"", name);
5904 sourcefile = guc_strdup(elevel, sourcefile);
5905 if (record->sourcefile)
5906 free(record->sourcefile);
5907 record->sourcefile = sourcefile;
5908 record->sourceline = sourceline;
5912 * Set a config option to the given value.
5914 * See also set_config_option; this is just the wrapper to be called from
5915 * outside GUC. (This function should be used when possible, because its API
5916 * is more stable than set_config_option's.)
5918 * Note: there is no support here for setting source file/line, as it
5919 * is currently not needed.
5922 SetConfigOption(const char *name, const char *value,
5923 GucContext context, GucSource source)
5925 (void) set_config_option(name, value, context, source,
5926 GUC_ACTION_SET, true, 0);
5932 * Fetch the current value of the option `name', as a string.
5934 * If the option doesn't exist, return NULL if missing_ok is true (NOTE that
5935 * this cannot be distinguished from a string variable with a NULL value!),
5936 * otherwise throw an ereport and don't return.
5938 * If restrict_superuser is true, we also enforce that only superusers can
5939 * see GUC_SUPERUSER_ONLY variables. This should only be passed as true
5940 * in user-driven calls.
5942 * The string is *not* allocated for modification and is really only
5943 * valid until the next call to configuration related functions.
5946 GetConfigOption(const char *name, bool missing_ok, bool restrict_superuser)
5948 struct config_generic *record;
5949 static char buffer[256];
5951 record = find_option(name, false, ERROR);
5957 (errcode(ERRCODE_UNDEFINED_OBJECT),
5958 errmsg("unrecognized configuration parameter \"%s\"",
5961 if (restrict_superuser &&
5962 (record->flags & GUC_SUPERUSER_ONLY) &&
5965 (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
5966 errmsg("must be superuser to examine \"%s\"", name)));
5968 switch (record->vartype)
5971 return *((struct config_bool *) record)->variable ? "on" : "off";
5974 snprintf(buffer, sizeof(buffer), "%d",
5975 *((struct config_int *) record)->variable);
5979 snprintf(buffer, sizeof(buffer), "%g",
5980 *((struct config_real *) record)->variable);
5984 return *((struct config_string *) record)->variable;
5987 return config_enum_lookup_by_value((struct config_enum *) record,
5988 *((struct config_enum *) record)->variable);
5994 * Get the RESET value associated with the given option.
5996 * Note: this is not re-entrant, due to use of static result buffer;
5997 * not to mention that a string variable could have its reset_val changed.
5998 * Beware of assuming the result value is good for very long.
6001 GetConfigOptionResetString(const char *name)
6003 struct config_generic *record;
6004 static char buffer[256];
6006 record = find_option(name, false, ERROR);
6009 (errcode(ERRCODE_UNDEFINED_OBJECT),
6010 errmsg("unrecognized configuration parameter \"%s\"", name)));
6011 if ((record->flags & GUC_SUPERUSER_ONLY) && !superuser())
6013 (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
6014 errmsg("must be superuser to examine \"%s\"", name)));
6016 switch (record->vartype)
6019 return ((struct config_bool *) record)->reset_val ? "on" : "off";
6022 snprintf(buffer, sizeof(buffer), "%d",
6023 ((struct config_int *) record)->reset_val);
6027 snprintf(buffer, sizeof(buffer), "%g",
6028 ((struct config_real *) record)->reset_val);
6032 return ((struct config_string *) record)->reset_val;
6035 return config_enum_lookup_by_value((struct config_enum *) record,
6036 ((struct config_enum *) record)->reset_val);
6043 * flatten_set_variable_args
6044 * Given a parsenode List as emitted by the grammar for SET,
6045 * convert to the flat string representation used by GUC.
6047 * We need to be told the name of the variable the args are for, because
6048 * the flattening rules vary (ugh).
6050 * The result is NULL if args is NIL (ie, SET ... TO DEFAULT), otherwise
6051 * a palloc'd string.
6054 flatten_set_variable_args(const char *name, List *args)
6056 struct config_generic *record;
6061 /* Fast path if just DEFAULT */
6066 * Get flags for the variable; if it's not known, use default flags.
6067 * (Caller might throw error later, but not our business to do so here.)
6069 record = find_option(name, false, WARNING);
6071 flags = record->flags;
6075 /* Complain if list input and non-list variable */
6076 if ((flags & GUC_LIST_INPUT) == 0 &&
6077 list_length(args) != 1)
6079 (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
6080 errmsg("SET %s takes only one argument", name)));
6082 initStringInfo(&buf);
6085 * Each list member may be a plain A_Const node, or an A_Const within a
6086 * TypeCast; the latter case is supported only for ConstInterval arguments
6087 * (for SET TIME ZONE).
6091 Node *arg = (Node *) lfirst(l);
6093 TypeName *typeName = NULL;
6096 if (l != list_head(args))
6097 appendStringInfo(&buf, ", ");
6099 if (IsA(arg, TypeCast))
6101 TypeCast *tc = (TypeCast *) arg;
6104 typeName = tc->typeName;
6107 if (!IsA(arg, A_Const))
6108 elog(ERROR, "unrecognized node type: %d", (int) nodeTag(arg));
6109 con = (A_Const *) arg;
6111 switch (nodeTag(&con->val))
6114 appendStringInfo(&buf, "%ld", intVal(&con->val));
6117 /* represented as a string, so just copy it */
6118 appendStringInfoString(&buf, strVal(&con->val));
6121 val = strVal(&con->val);
6122 if (typeName != NULL)
6125 * Must be a ConstInterval argument for TIME ZONE. Coerce
6126 * to interval and back to normalize the value and account
6134 typenameTypeIdAndMod(NULL, typeName, &typoid, &typmod);
6135 Assert(typoid == INTERVALOID);
6138 DirectFunctionCall3(interval_in,
6139 CStringGetDatum(val),
6140 ObjectIdGetDatum(InvalidOid),
6141 Int32GetDatum(typmod));
6144 DatumGetCString(DirectFunctionCall1(interval_out,
6146 appendStringInfo(&buf, "INTERVAL '%s'", intervalout);
6151 * Plain string literal or identifier. For quote mode,
6152 * quote it if it's not a vanilla identifier.
6154 if (flags & GUC_LIST_QUOTE)
6155 appendStringInfoString(&buf, quote_identifier(val));
6157 appendStringInfoString(&buf, val);
6161 elog(ERROR, "unrecognized node type: %d",
6162 (int) nodeTag(&con->val));
6175 ExecSetVariableStmt(VariableSetStmt *stmt)
6177 GucAction action = stmt->is_local ? GUC_ACTION_LOCAL : GUC_ACTION_SET;
6182 case VAR_SET_CURRENT:
6183 (void) set_config_option(stmt->name,
6184 ExtractSetVariableArgs(stmt),
6185 (superuser() ? PGC_SUSET : PGC_USERSET),
6194 * Special-case SQL syntaxes. The TRANSACTION and SESSION
6195 * CHARACTERISTICS cases effectively set more than one variable
6196 * per statement. TRANSACTION SNAPSHOT only takes one argument,
6197 * but we put it here anyway since it's a special case and not
6198 * related to any GUC variable.
6200 if (strcmp(stmt->name, "TRANSACTION") == 0)
6204 foreach(head, stmt->args)
6206 DefElem *item = (DefElem *) lfirst(head);
6208 if (strcmp(item->defname, "transaction_isolation") == 0)
6209 SetPGVariable("transaction_isolation",
6210 list_make1(item->arg), stmt->is_local);
6211 else if (strcmp(item->defname, "transaction_read_only") == 0)
6212 SetPGVariable("transaction_read_only",
6213 list_make1(item->arg), stmt->is_local);
6214 else if (strcmp(item->defname, "transaction_deferrable") == 0)
6215 SetPGVariable("transaction_deferrable",
6216 list_make1(item->arg), stmt->is_local);
6218 elog(ERROR, "unexpected SET TRANSACTION element: %s",
6222 else if (strcmp(stmt->name, "SESSION CHARACTERISTICS") == 0)
6226 foreach(head, stmt->args)
6228 DefElem *item = (DefElem *) lfirst(head);
6230 if (strcmp(item->defname, "transaction_isolation") == 0)
6231 SetPGVariable("default_transaction_isolation",
6232 list_make1(item->arg), stmt->is_local);
6233 else if (strcmp(item->defname, "transaction_read_only") == 0)
6234 SetPGVariable("default_transaction_read_only",
6235 list_make1(item->arg), stmt->is_local);
6236 else if (strcmp(item->defname, "transaction_deferrable") == 0)
6237 SetPGVariable("default_transaction_deferrable",
6238 list_make1(item->arg), stmt->is_local);
6240 elog(ERROR, "unexpected SET SESSION element: %s",
6244 else if (strcmp(stmt->name, "TRANSACTION SNAPSHOT") == 0)
6246 A_Const *con = (A_Const *) linitial(stmt->args);
6250 (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
6251 errmsg("SET LOCAL TRANSACTION SNAPSHOT is not implemented")));
6252 Assert(IsA(con, A_Const));
6253 Assert(nodeTag(&con->val) == T_String);
6254 ImportSnapshot(strVal(&con->val));
6257 elog(ERROR, "unexpected SET MULTI element: %s",
6260 case VAR_SET_DEFAULT:
6262 (void) set_config_option(stmt->name,
6264 (superuser() ? PGC_SUSET : PGC_USERSET),
6277 * Get the value to assign for a VariableSetStmt, or NULL if it's RESET.
6278 * The result is palloc'd.
6280 * This is exported for use by actions such as ALTER ROLE SET.
6283 ExtractSetVariableArgs(VariableSetStmt *stmt)
6288 return flatten_set_variable_args(stmt->name, stmt->args);
6289 case VAR_SET_CURRENT:
6290 return GetConfigOptionByName(stmt->name, NULL);
6297 * SetPGVariable - SET command exported as an easily-C-callable function.
6299 * This provides access to SET TO value, as well as SET TO DEFAULT (expressed
6300 * by passing args == NIL), but not SET FROM CURRENT functionality.
6303 SetPGVariable(const char *name, List *args, bool is_local)
6305 char *argstring = flatten_set_variable_args(name, args);
6307 /* Note SET DEFAULT (argstring == NULL) is equivalent to RESET */
6308 (void) set_config_option(name,
6310 (superuser() ? PGC_SUSET : PGC_USERSET),
6312 is_local ? GUC_ACTION_LOCAL : GUC_ACTION_SET,
6318 * SET command wrapped as a SQL callable function.
6321 set_config_by_name(PG_FUNCTION_ARGS)
6328 if (PG_ARGISNULL(0))
6330 (errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
6331 errmsg("SET requires parameter name")));
6333 /* Get the GUC variable name */
6334 name = TextDatumGetCString(PG_GETARG_DATUM(0));
6336 /* Get the desired value or set to NULL for a reset request */
6337 if (PG_ARGISNULL(1))
6340 value = TextDatumGetCString(PG_GETARG_DATUM(1));
6343 * Get the desired state of is_local. Default to false if provided value
6346 if (PG_ARGISNULL(2))
6349 is_local = PG_GETARG_BOOL(2);
6351 /* Note SET DEFAULT (argstring == NULL) is equivalent to RESET */
6352 (void) set_config_option(name,
6354 (superuser() ? PGC_SUSET : PGC_USERSET),
6356 is_local ? GUC_ACTION_LOCAL : GUC_ACTION_SET,
6360 /* get the new current value */
6361 new_value = GetConfigOptionByName(name, NULL);
6363 /* Convert return string to text */
6364 PG_RETURN_TEXT_P(cstring_to_text(new_value));
6369 * Common code for DefineCustomXXXVariable subroutines: allocate the
6370 * new variable's config struct and fill in generic fields.
6372 static struct config_generic *
6373 init_custom_variable(const char *name,
6374 const char *short_desc,
6375 const char *long_desc,
6378 enum config_type type,
6381 struct config_generic *gen;
6384 * Only allow custom PGC_POSTMASTER variables to be created during shared
6385 * library preload; any later than that, we can't ensure that the value
6386 * doesn't change after startup. This is a fatal elog if it happens; just
6387 * erroring out isn't safe because we don't know what the calling loadable
6388 * module might already have hooked into.
6390 if (context == PGC_POSTMASTER &&
6391 !process_shared_preload_libraries_in_progress)
6392 elog(FATAL, "cannot create PGC_POSTMASTER variables after startup");
6394 gen = (struct config_generic *) guc_malloc(ERROR, sz);
6397 gen->name = guc_strdup(ERROR, name);
6398 gen->context = context;
6399 gen->group = CUSTOM_OPTIONS;
6400 gen->short_desc = short_desc;
6401 gen->long_desc = long_desc;
6403 gen->vartype = type;
6409 * Common code for DefineCustomXXXVariable subroutines: insert the new
6410 * variable into the GUC variable array, replacing any placeholder.
6413 define_custom_variable(struct config_generic * variable)
6415 const char *name = variable->name;
6416 const char **nameAddr = &name;
6417 struct config_string *pHolder;
6418 struct config_generic **res;
6421 * See if there's a placeholder by the same name.
6423 res = (struct config_generic **) bsearch((void *) &nameAddr,
6424 (void *) guc_variables,
6426 sizeof(struct config_generic *),
6431 * No placeholder to replace, so we can just add it ... but first,
6432 * make sure it's initialized to its default value.
6434 InitializeOneGUCOption(variable);
6435 add_guc_variable(variable, ERROR);
6440 * This better be a placeholder
6442 if (((*res)->flags & GUC_CUSTOM_PLACEHOLDER) == 0)
6444 (errcode(ERRCODE_INTERNAL_ERROR),
6445 errmsg("attempt to redefine parameter \"%s\"", name)));
6447 Assert((*res)->vartype == PGC_STRING);
6448 pHolder = (struct config_string *) (*res);
6451 * First, set the variable to its default value. We must do this even
6452 * though we intend to immediately apply a new value, since it's possible
6453 * that the new value is invalid.
6455 InitializeOneGUCOption(variable);
6458 * Replace the placeholder. We aren't changing the name, so no re-sorting
6464 * Assign the string value(s) stored in the placeholder to the real
6465 * variable. Essentially, we need to duplicate all the active and stacked
6466 * values, but with appropriate validation and datatype adjustment.
6468 * If an assignment fails, we report a WARNING and keep going. We don't
6469 * want to throw ERROR for bad values, because it'd bollix the add-on
6470 * module that's presumably halfway through getting loaded. In such cases
6471 * the default or previous state will become active instead.
6474 /* First, apply the reset value if any */
6475 if (pHolder->reset_val)
6476 (void) set_config_option(name, pHolder->reset_val,
6477 pHolder->gen.reset_scontext,
6478 pHolder->gen.reset_source,
6479 GUC_ACTION_SET, true, WARNING);
6480 /* That should not have resulted in stacking anything */
6481 Assert(variable->stack == NULL);
6483 /* Now, apply current and stacked values, in the order they were stacked */
6484 reapply_stacked_values(variable, pHolder, pHolder->gen.stack,
6485 *(pHolder->variable),
6486 pHolder->gen.scontext, pHolder->gen.source);
6488 /* Also copy over any saved source-location information */
6489 if (pHolder->gen.sourcefile)
6490 set_config_sourcefile(name, pHolder->gen.sourcefile,
6491 pHolder->gen.sourceline);
6494 * Free up as much as we conveniently can of the placeholder structure.
6495 * (This neglects any stack items, so it's possible for some memory to be
6496 * leaked. Since this can only happen once per session per variable, it
6497 * doesn't seem worth spending much code on.)
6499 set_string_field(pHolder, pHolder->variable, NULL);
6500 set_string_field(pHolder, &pHolder->reset_val, NULL);
6506 * Recursive subroutine for define_custom_variable: reapply non-reset values
6508 * We recurse so that the values are applied in the same order as originally.
6509 * At each recursion level, apply the upper-level value (passed in) in the
6510 * fashion implied by the stack entry.
6513 reapply_stacked_values(struct config_generic * variable,
6514 struct config_string * pHolder,
6516 const char *curvalue,
6517 GucContext curscontext, GucSource cursource)
6519 const char *name = variable->name;
6520 GucStack *oldvarstack = variable->stack;
6524 /* First, recurse, so that stack items are processed bottom to top */
6525 reapply_stacked_values(variable, pHolder, stack->prev,
6526 stack->prior.val.stringval,
6527 stack->scontext, stack->source);
6529 /* See how to apply the passed-in value */
6530 switch (stack->state)
6533 (void) set_config_option(name, curvalue,
6534 curscontext, cursource,
6535 GUC_ACTION_SAVE, true, WARNING);
6539 (void) set_config_option(name, curvalue,
6540 curscontext, cursource,
6541 GUC_ACTION_SET, true, WARNING);
6545 (void) set_config_option(name, curvalue,
6546 curscontext, cursource,
6547 GUC_ACTION_LOCAL, true, WARNING);
6551 /* first, apply the masked value as SET */
6552 (void) set_config_option(name, stack->masked.val.stringval,
6553 stack->masked_scontext, PGC_S_SESSION,
6554 GUC_ACTION_SET, true, WARNING);
6555 /* then apply the current value as LOCAL */
6556 (void) set_config_option(name, curvalue,
6557 curscontext, cursource,
6558 GUC_ACTION_LOCAL, true, WARNING);
6562 /* If we successfully made a stack entry, adjust its nest level */
6563 if (variable->stack != oldvarstack)
6564 variable->stack->nest_level = stack->nest_level;
6569 * We are at the end of the stack. If the active/previous value is
6570 * different from the reset value, it must represent a previously
6571 * committed session value. Apply it, and then drop the stack entry
6572 * that set_config_option will have created under the impression that
6573 * this is to be just a transactional assignment. (We leak the stack
6576 if (curvalue != pHolder->reset_val ||
6577 curscontext != pHolder->gen.reset_scontext ||
6578 cursource != pHolder->gen.reset_source)
6580 (void) set_config_option(name, curvalue,
6581 curscontext, cursource,
6582 GUC_ACTION_SET, true, WARNING);
6583 variable->stack = NULL;
6589 DefineCustomBoolVariable(const char *name,
6590 const char *short_desc,
6591 const char *long_desc,
6596 GucBoolCheckHook check_hook,
6597 GucBoolAssignHook assign_hook,
6598 GucShowHook show_hook)
6600 struct config_bool *var;
6602 var = (struct config_bool *)
6603 init_custom_variable(name, short_desc, long_desc, context, flags,
6604 PGC_BOOL, sizeof(struct config_bool));
6605 var->variable = valueAddr;
6606 var->boot_val = bootValue;
6607 var->reset_val = bootValue;
6608 var->check_hook = check_hook;
6609 var->assign_hook = assign_hook;
6610 var->show_hook = show_hook;
6611 define_custom_variable(&var->gen);
6615 DefineCustomIntVariable(const char *name,
6616 const char *short_desc,
6617 const char *long_desc,
6624 GucIntCheckHook check_hook,
6625 GucIntAssignHook assign_hook,
6626 GucShowHook show_hook)
6628 struct config_int *var;
6630 var = (struct config_int *)
6631 init_custom_variable(name, short_desc, long_desc, context, flags,
6632 PGC_INT, sizeof(struct config_int));
6633 var->variable = valueAddr;
6634 var->boot_val = bootValue;
6635 var->reset_val = bootValue;
6636 var->min = minValue;
6637 var->max = maxValue;
6638 var->check_hook = check_hook;
6639 var->assign_hook = assign_hook;
6640 var->show_hook = show_hook;
6641 define_custom_variable(&var->gen);
6645 DefineCustomRealVariable(const char *name,
6646 const char *short_desc,
6647 const char *long_desc,
6654 GucRealCheckHook check_hook,
6655 GucRealAssignHook assign_hook,
6656 GucShowHook show_hook)
6658 struct config_real *var;
6660 var = (struct config_real *)
6661 init_custom_variable(name, short_desc, long_desc, context, flags,
6662 PGC_REAL, sizeof(struct config_real));
6663 var->variable = valueAddr;
6664 var->boot_val = bootValue;
6665 var->reset_val = bootValue;
6666 var->min = minValue;
6667 var->max = maxValue;
6668 var->check_hook = check_hook;
6669 var->assign_hook = assign_hook;
6670 var->show_hook = show_hook;
6671 define_custom_variable(&var->gen);
6675 DefineCustomStringVariable(const char *name,
6676 const char *short_desc,
6677 const char *long_desc,
6679 const char *bootValue,
6682 GucStringCheckHook check_hook,
6683 GucStringAssignHook assign_hook,
6684 GucShowHook show_hook)
6686 struct config_string *var;
6688 var = (struct config_string *)
6689 init_custom_variable(name, short_desc, long_desc, context, flags,
6690 PGC_STRING, sizeof(struct config_string));
6691 var->variable = valueAddr;
6692 var->boot_val = bootValue;
6693 var->check_hook = check_hook;
6694 var->assign_hook = assign_hook;
6695 var->show_hook = show_hook;
6696 define_custom_variable(&var->gen);
6700 DefineCustomEnumVariable(const char *name,
6701 const char *short_desc,
6702 const char *long_desc,
6705 const struct config_enum_entry * options,
6708 GucEnumCheckHook check_hook,
6709 GucEnumAssignHook assign_hook,
6710 GucShowHook show_hook)
6712 struct config_enum *var;
6714 var = (struct config_enum *)
6715 init_custom_variable(name, short_desc, long_desc, context, flags,
6716 PGC_ENUM, sizeof(struct config_enum));
6717 var->variable = valueAddr;
6718 var->boot_val = bootValue;
6719 var->reset_val = bootValue;
6720 var->options = options;
6721 var->check_hook = check_hook;
6722 var->assign_hook = assign_hook;
6723 var->show_hook = show_hook;
6724 define_custom_variable(&var->gen);
6728 EmitWarningsOnPlaceholders(const char *className)
6730 int classLen = strlen(className);
6733 for (i = 0; i < num_guc_variables; i++)
6735 struct config_generic *var = guc_variables[i];
6737 if ((var->flags & GUC_CUSTOM_PLACEHOLDER) != 0 &&
6738 strncmp(className, var->name, classLen) == 0 &&
6739 var->name[classLen] == GUC_QUALIFIER_SEPARATOR)
6742 (errcode(ERRCODE_UNDEFINED_OBJECT),
6743 errmsg("unrecognized configuration parameter \"%s\"",
6754 GetPGVariable(const char *name, DestReceiver *dest)
6756 if (guc_name_compare(name, "all") == 0)
6757 ShowAllGUCConfig(dest);
6759 ShowGUCConfigOption(name, dest);
6763 GetPGVariableResultDesc(const char *name)
6767 if (guc_name_compare(name, "all") == 0)
6769 /* need a tuple descriptor representing three TEXT columns */
6770 tupdesc = CreateTemplateTupleDesc(3, false);
6771 TupleDescInitEntry(tupdesc, (AttrNumber) 1, "name",
6773 TupleDescInitEntry(tupdesc, (AttrNumber) 2, "setting",
6775 TupleDescInitEntry(tupdesc, (AttrNumber) 3, "description",
6780 const char *varname;
6782 /* Get the canonical spelling of name */
6783 (void) GetConfigOptionByName(name, &varname);
6785 /* need a tuple descriptor representing a single TEXT column */
6786 tupdesc = CreateTemplateTupleDesc(1, false);
6787 TupleDescInitEntry(tupdesc, (AttrNumber) 1, varname,
6798 ShowGUCConfigOption(const char *name, DestReceiver *dest)
6800 TupOutputState *tstate;
6802 const char *varname;
6805 /* Get the value and canonical spelling of name */
6806 value = GetConfigOptionByName(name, &varname);
6808 /* need a tuple descriptor representing a single TEXT column */
6809 tupdesc = CreateTemplateTupleDesc(1, false);
6810 TupleDescInitEntry(tupdesc, (AttrNumber) 1, varname,
6813 /* prepare for projection of tuples */
6814 tstate = begin_tup_output_tupdesc(dest, tupdesc);
6817 do_text_output_oneline(tstate, value);
6819 end_tup_output(tstate);
6826 ShowAllGUCConfig(DestReceiver *dest)
6828 bool am_superuser = superuser();
6830 TupOutputState *tstate;
6833 bool isnull[3] = {false, false, false};
6835 /* need a tuple descriptor representing three TEXT columns */
6836 tupdesc = CreateTemplateTupleDesc(3, false);
6837 TupleDescInitEntry(tupdesc, (AttrNumber) 1, "name",
6839 TupleDescInitEntry(tupdesc, (AttrNumber) 2, "setting",
6841 TupleDescInitEntry(tupdesc, (AttrNumber) 3, "description",
6844 /* prepare for projection of tuples */
6845 tstate = begin_tup_output_tupdesc(dest, tupdesc);
6847 for (i = 0; i < num_guc_variables; i++)
6849 struct config_generic *conf = guc_variables[i];
6852 if ((conf->flags & GUC_NO_SHOW_ALL) ||
6853 ((conf->flags & GUC_SUPERUSER_ONLY) && !am_superuser))
6856 /* assign to the values array */
6857 values[0] = PointerGetDatum(cstring_to_text(conf->name));
6859 setting = _ShowOption(conf, true);
6862 values[1] = PointerGetDatum(cstring_to_text(setting));
6867 values[1] = PointerGetDatum(NULL);
6871 values[2] = PointerGetDatum(cstring_to_text(conf->short_desc));
6873 /* send it to dest */
6874 do_tup_output(tstate, values, isnull);
6877 pfree(DatumGetPointer(values[0]));
6881 pfree(DatumGetPointer(values[1]));
6883 pfree(DatumGetPointer(values[2]));
6886 end_tup_output(tstate);
6890 * Return GUC variable value by name; optionally return canonical
6891 * form of name. Return value is palloc'd.
6894 GetConfigOptionByName(const char *name, const char **varname)
6896 struct config_generic *record;
6898 record = find_option(name, false, ERROR);
6901 (errcode(ERRCODE_UNDEFINED_OBJECT),
6902 errmsg("unrecognized configuration parameter \"%s\"", name)));
6903 if ((record->flags & GUC_SUPERUSER_ONLY) && !superuser())
6905 (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
6906 errmsg("must be superuser to examine \"%s\"", name)));
6909 *varname = record->name;
6911 return _ShowOption(record, true);
6915 * Return GUC variable value by variable number; optionally return canonical
6916 * form of name. Return value is palloc'd.
6919 GetConfigOptionByNum(int varnum, const char **values, bool *noshow)
6922 struct config_generic *conf;
6924 /* check requested variable number valid */
6925 Assert((varnum >= 0) && (varnum < num_guc_variables));
6927 conf = guc_variables[varnum];
6931 if ((conf->flags & GUC_NO_SHOW_ALL) ||
6932 ((conf->flags & GUC_SUPERUSER_ONLY) && !superuser()))
6938 /* first get the generic attributes */
6941 values[0] = conf->name;
6943 /* setting : use _ShowOption in order to avoid duplicating the logic */
6944 values[1] = _ShowOption(conf, false);
6947 if (conf->vartype == PGC_INT)
6951 switch (conf->flags & (GUC_UNIT_MEMORY | GUC_UNIT_TIME))
6956 case GUC_UNIT_BLOCKS:
6957 snprintf(buf, sizeof(buf), "%dkB", BLCKSZ / 1024);
6960 case GUC_UNIT_XBLOCKS:
6961 snprintf(buf, sizeof(buf), "%dkB", XLOG_BLCKSZ / 1024);
6982 values[3] = config_group_names[conf->group];
6985 values[4] = conf->short_desc;
6988 values[5] = conf->long_desc;
6991 values[6] = GucContext_Names[conf->context];
6994 values[7] = config_type_names[conf->vartype];
6997 values[8] = GucSource_Names[conf->source];
6999 /* now get the type specifc attributes */
7000 switch (conf->vartype)
7004 struct config_bool *lconf = (struct config_bool *) conf;
7016 values[12] = pstrdup(lconf->boot_val ? "on" : "off");
7019 values[13] = pstrdup(lconf->reset_val ? "on" : "off");
7025 struct config_int *lconf = (struct config_int *) conf;
7028 snprintf(buffer, sizeof(buffer), "%d", lconf->min);
7029 values[9] = pstrdup(buffer);
7032 snprintf(buffer, sizeof(buffer), "%d", lconf->max);
7033 values[10] = pstrdup(buffer);
7039 snprintf(buffer, sizeof(buffer), "%d", lconf->boot_val);
7040 values[12] = pstrdup(buffer);
7043 snprintf(buffer, sizeof(buffer), "%d", lconf->reset_val);
7044 values[13] = pstrdup(buffer);
7050 struct config_real *lconf = (struct config_real *) conf;
7053 snprintf(buffer, sizeof(buffer), "%g", lconf->min);
7054 values[9] = pstrdup(buffer);
7057 snprintf(buffer, sizeof(buffer), "%g", lconf->max);
7058 values[10] = pstrdup(buffer);
7064 snprintf(buffer, sizeof(buffer), "%g", lconf->boot_val);
7065 values[12] = pstrdup(buffer);
7068 snprintf(buffer, sizeof(buffer), "%g", lconf->reset_val);
7069 values[13] = pstrdup(buffer);
7075 struct config_string *lconf = (struct config_string *) conf;
7087 if (lconf->boot_val == NULL)
7090 values[12] = pstrdup(lconf->boot_val);
7093 if (lconf->reset_val == NULL)
7096 values[13] = pstrdup(lconf->reset_val);
7102 struct config_enum *lconf = (struct config_enum *) conf;
7113 * NOTE! enumvals with double quotes in them are not
7116 values[11] = config_enum_get_options((struct config_enum *) conf,
7117 "{\"", "\"}", "\",\"");
7120 values[12] = pstrdup(config_enum_lookup_by_value(lconf,
7124 values[13] = pstrdup(config_enum_lookup_by_value(lconf,
7132 * should never get here, but in case we do, set 'em to NULL
7154 * If the setting came from a config file, set the source location. For
7155 * security reasons, we don't show source file/line number for
7158 if (conf->source == PGC_S_FILE && superuser())
7160 values[14] = conf->sourcefile;
7161 snprintf(buffer, sizeof(buffer), "%d", conf->sourceline);
7162 values[15] = pstrdup(buffer);
7172 * Return the total number of GUC variables
7175 GetNumConfigOptions(void)
7177 return num_guc_variables;
7181 * show_config_by_name - equiv to SHOW X command but implemented as
7185 show_config_by_name(PG_FUNCTION_ARGS)
7190 /* Get the GUC variable name */
7191 varname = TextDatumGetCString(PG_GETARG_DATUM(0));
7194 varval = GetConfigOptionByName(varname, NULL);
7196 /* Convert to text */
7197 PG_RETURN_TEXT_P(cstring_to_text(varval));
7201 * show_all_settings - equiv to SHOW ALL command but implemented as
7204 #define NUM_PG_SETTINGS_ATTS 16
7207 show_all_settings(PG_FUNCTION_ARGS)
7209 FuncCallContext *funcctx;
7213 AttInMetadata *attinmeta;
7214 MemoryContext oldcontext;
7216 /* stuff done only on the first call of the function */
7217 if (SRF_IS_FIRSTCALL())
7219 /* create a function context for cross-call persistence */
7220 funcctx = SRF_FIRSTCALL_INIT();
7223 * switch to memory context appropriate for multiple function calls
7225 oldcontext = MemoryContextSwitchTo(funcctx->multi_call_memory_ctx);
7228 * need a tuple descriptor representing NUM_PG_SETTINGS_ATTS columns
7229 * of the appropriate types
7231 tupdesc = CreateTemplateTupleDesc(NUM_PG_SETTINGS_ATTS, false);
7232 TupleDescInitEntry(tupdesc, (AttrNumber) 1, "name",
7234 TupleDescInitEntry(tupdesc, (AttrNumber) 2, "setting",
7236 TupleDescInitEntry(tupdesc, (AttrNumber) 3, "unit",
7238 TupleDescInitEntry(tupdesc, (AttrNumber) 4, "category",
7240 TupleDescInitEntry(tupdesc, (AttrNumber) 5, "short_desc",
7242 TupleDescInitEntry(tupdesc, (AttrNumber) 6, "extra_desc",
7244 TupleDescInitEntry(tupdesc, (AttrNumber) 7, "context",
7246 TupleDescInitEntry(tupdesc, (AttrNumber) 8, "vartype",
7248 TupleDescInitEntry(tupdesc, (AttrNumber) 9, "source",
7250 TupleDescInitEntry(tupdesc, (AttrNumber) 10, "min_val",
7252 TupleDescInitEntry(tupdesc, (AttrNumber) 11, "max_val",
7254 TupleDescInitEntry(tupdesc, (AttrNumber) 12, "enumvals",
7255 TEXTARRAYOID, -1, 0);
7256 TupleDescInitEntry(tupdesc, (AttrNumber) 13, "boot_val",
7258 TupleDescInitEntry(tupdesc, (AttrNumber) 14, "reset_val",
7260 TupleDescInitEntry(tupdesc, (AttrNumber) 15, "sourcefile",
7262 TupleDescInitEntry(tupdesc, (AttrNumber) 16, "sourceline",
7266 * Generate attribute metadata needed later to produce tuples from raw
7269 attinmeta = TupleDescGetAttInMetadata(tupdesc);
7270 funcctx->attinmeta = attinmeta;
7272 /* total number of tuples to be returned */
7273 funcctx->max_calls = GetNumConfigOptions();
7275 MemoryContextSwitchTo(oldcontext);
7278 /* stuff done on every call of the function */
7279 funcctx = SRF_PERCALL_SETUP();
7281 call_cntr = funcctx->call_cntr;
7282 max_calls = funcctx->max_calls;
7283 attinmeta = funcctx->attinmeta;
7285 if (call_cntr < max_calls) /* do when there is more left to send */
7287 char *values[NUM_PG_SETTINGS_ATTS];
7293 * Get the next visible GUC variable name and value
7297 GetConfigOptionByNum(call_cntr, (const char **) values, &noshow);
7300 /* bump the counter and get the next config setting */
7301 call_cntr = ++funcctx->call_cntr;
7303 /* make sure we haven't gone too far now */
7304 if (call_cntr >= max_calls)
7305 SRF_RETURN_DONE(funcctx);
7310 tuple = BuildTupleFromCStrings(attinmeta, values);
7312 /* make the tuple into a datum */
7313 result = HeapTupleGetDatum(tuple);
7315 SRF_RETURN_NEXT(funcctx, result);
7319 /* do when there is no more left */
7320 SRF_RETURN_DONE(funcctx);
7325 _ShowOption(struct config_generic * record, bool use_units)
7330 switch (record->vartype)
7334 struct config_bool *conf = (struct config_bool *) record;
7336 if (conf->show_hook)
7337 val = (*conf->show_hook) ();
7339 val = *conf->variable ? "on" : "off";
7345 struct config_int *conf = (struct config_int *) record;
7347 if (conf->show_hook)
7348 val = (*conf->show_hook) ();
7352 * Use int64 arithmetic to avoid overflows in units
7355 int64 result = *conf->variable;
7358 if (use_units && result > 0 &&
7359 (record->flags & GUC_UNIT_MEMORY))
7361 switch (record->flags & GUC_UNIT_MEMORY)
7363 case GUC_UNIT_BLOCKS:
7364 result *= BLCKSZ / 1024;
7366 case GUC_UNIT_XBLOCKS:
7367 result *= XLOG_BLCKSZ / 1024;
7371 if (result % KB_PER_GB == 0)
7373 result /= KB_PER_GB;
7376 else if (result % KB_PER_MB == 0)
7378 result /= KB_PER_MB;
7386 else if (use_units && result > 0 &&
7387 (record->flags & GUC_UNIT_TIME))
7389 switch (record->flags & GUC_UNIT_TIME)
7395 result *= MS_PER_MIN;
7399 if (result % MS_PER_D == 0)
7404 else if (result % MS_PER_H == 0)
7409 else if (result % MS_PER_MIN == 0)
7411 result /= MS_PER_MIN;
7414 else if (result % MS_PER_S == 0)
7427 snprintf(buffer, sizeof(buffer), INT64_FORMAT "%s",
7436 struct config_real *conf = (struct config_real *) record;
7438 if (conf->show_hook)
7439 val = (*conf->show_hook) ();
7442 snprintf(buffer, sizeof(buffer), "%g",
7451 struct config_string *conf = (struct config_string *) record;
7453 if (conf->show_hook)
7454 val = (*conf->show_hook) ();
7455 else if (*conf->variable && **conf->variable)
7456 val = *conf->variable;
7464 struct config_enum *conf = (struct config_enum *) record;
7466 if (conf->show_hook)
7467 val = (*conf->show_hook) ();
7469 val = config_enum_lookup_by_value(conf, *conf->variable);
7474 /* just to keep compiler quiet */
7479 return pstrdup(val);
7486 * These routines dump out all non-default GUC options into a binary
7487 * file that is read by all exec'ed backends. The format is:
7489 * variable name, string, null terminated
7490 * variable value, string, null terminated
7491 * variable sourcefile, string, null terminated (empty if none)
7492 * variable sourceline, integer
7493 * variable source, integer
7494 * variable scontext, integer
7497 write_one_nondefault_variable(FILE *fp, struct config_generic * gconf)
7499 if (gconf->source == PGC_S_DEFAULT)
7502 fprintf(fp, "%s", gconf->name);
7505 switch (gconf->vartype)
7509 struct config_bool *conf = (struct config_bool *) gconf;
7511 if (*conf->variable)
7512 fprintf(fp, "true");
7514 fprintf(fp, "false");
7520 struct config_int *conf = (struct config_int *) gconf;
7522 fprintf(fp, "%d", *conf->variable);
7528 struct config_real *conf = (struct config_real *) gconf;
7530 fprintf(fp, "%.17g", *conf->variable);
7536 struct config_string *conf = (struct config_string *) gconf;
7538 fprintf(fp, "%s", *conf->variable);
7544 struct config_enum *conf = (struct config_enum *) gconf;
7547 config_enum_lookup_by_value(conf, *conf->variable));
7554 if (gconf->sourcefile)
7555 fprintf(fp, "%s", gconf->sourcefile);
7558 fwrite(&gconf->sourceline, 1, sizeof(gconf->sourceline), fp);
7559 fwrite(&gconf->source, 1, sizeof(gconf->source), fp);
7560 fwrite(&gconf->scontext, 1, sizeof(gconf->scontext), fp);
7564 write_nondefault_variables(GucContext context)
7570 Assert(context == PGC_POSTMASTER || context == PGC_SIGHUP);
7572 elevel = (context == PGC_SIGHUP) ? LOG : ERROR;
7577 fp = AllocateFile(CONFIG_EXEC_PARAMS_NEW, "w");
7581 (errcode_for_file_access(),
7582 errmsg("could not write to file \"%s\": %m",
7583 CONFIG_EXEC_PARAMS_NEW)));
7587 for (i = 0; i < num_guc_variables; i++)
7589 write_one_nondefault_variable(fp, guc_variables[i]);
7595 (errcode_for_file_access(),
7596 errmsg("could not write to file \"%s\": %m",
7597 CONFIG_EXEC_PARAMS_NEW)));
7602 * Put new file in place. This could delay on Win32, but we don't hold
7603 * any exclusive locks.
7605 rename(CONFIG_EXEC_PARAMS_NEW, CONFIG_EXEC_PARAMS);
7610 * Read string, including null byte from file
7612 * Return NULL on EOF and nothing read
7615 read_string_with_null(FILE *fp)
7624 if ((ch = fgetc(fp)) == EOF)
7629 elog(FATAL, "invalid format of exec config params file");
7632 str = guc_malloc(FATAL, maxlen);
7633 else if (i == maxlen)
7634 str = guc_realloc(FATAL, str, maxlen *= 2);
7643 * This routine loads a previous postmaster dump of its non-default
7647 read_nondefault_variables(void)
7654 GucSource varsource;
7655 GucContext varscontext;
7660 fp = AllocateFile(CONFIG_EXEC_PARAMS, "r");
7663 /* File not found is fine */
7664 if (errno != ENOENT)
7666 (errcode_for_file_access(),
7667 errmsg("could not read from file \"%s\": %m",
7668 CONFIG_EXEC_PARAMS)));
7674 struct config_generic *record;
7676 if ((varname = read_string_with_null(fp)) == NULL)
7679 if ((record = find_option(varname, true, FATAL)) == NULL)
7680 elog(FATAL, "failed to locate variable \"%s\" in exec config params file", varname);
7682 if ((varvalue = read_string_with_null(fp)) == NULL)
7683 elog(FATAL, "invalid format of exec config params file");
7684 if ((varsourcefile = read_string_with_null(fp)) == NULL)
7685 elog(FATAL, "invalid format of exec config params file");
7686 if (fread(&varsourceline, 1, sizeof(varsourceline), fp) != sizeof(varsourceline))
7687 elog(FATAL, "invalid format of exec config params file");
7688 if (fread(&varsource, 1, sizeof(varsource), fp) != sizeof(varsource))
7689 elog(FATAL, "invalid format of exec config params file");
7690 if (fread(&varscontext, 1, sizeof(varscontext), fp) != sizeof(varscontext))
7691 elog(FATAL, "invalid format of exec config params file");
7693 (void) set_config_option(varname, varvalue,
7694 varscontext, varsource,
7695 GUC_ACTION_SET, true, 0);
7696 if (varsourcefile[0])
7697 set_config_sourcefile(varname, varsourcefile, varsourceline);
7701 free(varsourcefile);
7706 #endif /* EXEC_BACKEND */
7710 * A little "long argument" simulation, although not quite GNU
7711 * compliant. Takes a string of the form "some-option=some value" and
7712 * returns name = "some_option" and value = "some value" in malloc'ed
7713 * storage. Note that '-' is converted to '_' in the option name. If
7714 * there is no '=' in the input string then value will be NULL.
7717 ParseLongOption(const char *string, char **name, char **value)
7726 equal_pos = strcspn(string, "=");
7728 if (string[equal_pos] == '=')
7730 *name = guc_malloc(FATAL, equal_pos + 1);
7731 strlcpy(*name, string, equal_pos + 1);
7733 *value = guc_strdup(FATAL, &string[equal_pos + 1]);
7737 /* no equal sign in string */
7738 *name = guc_strdup(FATAL, string);
7742 for (cp = *name; *cp; cp++)
7749 * Handle options fetched from pg_db_role_setting.setconfig,
7750 * pg_proc.proconfig, etc. Caller must specify proper context/source/action.
7752 * The array parameter must be an array of TEXT (it must not be NULL).
7755 ProcessGUCArray(ArrayType *array,
7756 GucContext context, GucSource source, GucAction action)
7760 Assert(array != NULL);
7761 Assert(ARR_ELEMTYPE(array) == TEXTOID);
7762 Assert(ARR_NDIM(array) == 1);
7763 Assert(ARR_LBOUND(array)[0] == 1);
7765 for (i = 1; i <= ARR_DIMS(array)[0]; i++)
7773 d = array_ref(array, 1, &i,
7774 -1 /* varlenarray */ ,
7775 -1 /* TEXT's typlen */ ,
7776 false /* TEXT's typbyval */ ,
7777 'i' /* TEXT's typalign */ ,
7783 s = TextDatumGetCString(d);
7785 ParseLongOption(s, &name, &value);
7789 (errcode(ERRCODE_SYNTAX_ERROR),
7790 errmsg("could not parse setting for parameter \"%s\"",
7796 (void) set_config_option(name, value,
7809 * Add an entry to an option array. The array parameter may be NULL
7810 * to indicate the current table entry is NULL.
7813 GUCArrayAdd(ArrayType *array, const char *name, const char *value)
7815 struct config_generic *record;
7823 /* test if the option is valid and we're allowed to set it */
7824 (void) validate_option_array_item(name, value, false);
7826 /* normalize name (converts obsolete GUC names to modern spellings) */
7827 record = find_option(name, false, WARNING);
7829 name = record->name;
7831 /* build new item for array */
7832 newval = palloc(strlen(name) + 1 + strlen(value) + 1);
7833 sprintf(newval, "%s=%s", name, value);
7834 datum = CStringGetTextDatum(newval);
7842 Assert(ARR_ELEMTYPE(array) == TEXTOID);
7843 Assert(ARR_NDIM(array) == 1);
7844 Assert(ARR_LBOUND(array)[0] == 1);
7846 index = ARR_DIMS(array)[0] + 1; /* add after end */
7848 for (i = 1; i <= ARR_DIMS(array)[0]; i++)
7853 d = array_ref(array, 1, &i,
7854 -1 /* varlenarray */ ,
7855 -1 /* TEXT's typlen */ ,
7856 false /* TEXT's typbyval */ ,
7857 'i' /* TEXT's typalign */ ,
7861 current = TextDatumGetCString(d);
7863 /* check for match up through and including '=' */
7864 if (strncmp(current, newval, strlen(name) + 1) == 0)
7871 a = array_set(array, 1, &index,
7874 -1 /* varlena array */ ,
7875 -1 /* TEXT's typlen */ ,
7876 false /* TEXT's typbyval */ ,
7877 'i' /* TEXT's typalign */ );
7880 a = construct_array(&datum, 1,
7889 * Delete an entry from an option array. The array parameter may be NULL
7890 * to indicate the current table entry is NULL. Also, if the return value
7891 * is NULL then a null should be stored.
7894 GUCArrayDelete(ArrayType *array, const char *name)
7896 struct config_generic *record;
7897 ArrayType *newarray;
7903 /* test if the option is valid and we're allowed to set it */
7904 (void) validate_option_array_item(name, NULL, false);
7906 /* normalize name (converts obsolete GUC names to modern spellings) */
7907 record = find_option(name, false, WARNING);
7909 name = record->name;
7911 /* if array is currently null, then surely nothing to delete */
7918 for (i = 1; i <= ARR_DIMS(array)[0]; i++)
7924 d = array_ref(array, 1, &i,
7925 -1 /* varlenarray */ ,
7926 -1 /* TEXT's typlen */ ,
7927 false /* TEXT's typbyval */ ,
7928 'i' /* TEXT's typalign */ ,
7932 val = TextDatumGetCString(d);
7934 /* ignore entry if it's what we want to delete */
7935 if (strncmp(val, name, strlen(name)) == 0
7936 && val[strlen(name)] == '=')
7939 /* else add it to the output array */
7941 newarray = array_set(newarray, 1, &index,
7944 -1 /* varlenarray */ ,
7945 -1 /* TEXT's typlen */ ,
7946 false /* TEXT's typbyval */ ,
7947 'i' /* TEXT's typalign */ );
7949 newarray = construct_array(&d, 1,
7961 * Given a GUC array, delete all settings from it that our permission
7962 * level allows: if superuser, delete them all; if regular user, only
7963 * those that are PGC_USERSET
7966 GUCArrayReset(ArrayType *array)
7968 ArrayType *newarray;
7972 /* if array is currently null, nothing to do */
7976 /* if we're superuser, we can delete everything, so just do it */
7983 for (i = 1; i <= ARR_DIMS(array)[0]; i++)
7990 d = array_ref(array, 1, &i,
7991 -1 /* varlenarray */ ,
7992 -1 /* TEXT's typlen */ ,
7993 false /* TEXT's typbyval */ ,
7994 'i' /* TEXT's typalign */ ,
7998 val = TextDatumGetCString(d);
8000 eqsgn = strchr(val, '=');
8003 /* skip if we have permission to delete it */
8004 if (validate_option_array_item(val, NULL, true))
8007 /* else add it to the output array */
8009 newarray = array_set(newarray, 1, &index,
8012 -1 /* varlenarray */ ,
8013 -1 /* TEXT's typlen */ ,
8014 false /* TEXT's typbyval */ ,
8015 'i' /* TEXT's typalign */ );
8017 newarray = construct_array(&d, 1,
8029 * Validate a proposed option setting for GUCArrayAdd/Delete/Reset.
8031 * name is the option name. value is the proposed value for the Add case,
8032 * or NULL for the Delete/Reset cases. If skipIfNoPermissions is true, it's
8033 * not an error to have no permissions to set the option.
8035 * Returns TRUE if OK, FALSE if skipIfNoPermissions is true and user does not
8036 * have permission to change this option (all other error cases result in an
8037 * error being thrown).
8040 validate_option_array_item(const char *name, const char *value,
8041 bool skipIfNoPermissions)
8044 struct config_generic *gconf;
8047 * There are three cases to consider:
8049 * name is a known GUC variable. Check the value normally, check
8050 * permissions normally (ie, allow if variable is USERSET, or if it's
8051 * SUSET and user is superuser).
8053 * name is not known, but exists or can be created as a placeholder (i.e.,
8054 * it has a prefixed name). We allow this case if you're a superuser,
8055 * otherwise not. Superusers are assumed to know what they're doing. We
8056 * can't allow it for other users, because when the placeholder is
8057 * resolved it might turn out to be a SUSET variable;
8058 * define_custom_variable assumes we checked that.
8060 * name is not known and can't be created as a placeholder. Throw error,
8061 * unless skipIfNoPermissions is true, in which case return FALSE.
8063 gconf = find_option(name, true, WARNING);
8066 /* not known, failed to make a placeholder */
8067 if (skipIfNoPermissions)
8070 (errcode(ERRCODE_UNDEFINED_OBJECT),
8071 errmsg("unrecognized configuration parameter \"%s\"",
8075 if (gconf->flags & GUC_CUSTOM_PLACEHOLDER)
8078 * We cannot do any meaningful check on the value, so only permissions
8079 * are useful to check.
8083 if (skipIfNoPermissions)
8086 (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
8087 errmsg("permission denied to set parameter \"%s\"", name)));
8090 /* manual permissions check so we can avoid an error being thrown */
8091 if (gconf->context == PGC_USERSET)
8093 else if (gconf->context == PGC_SUSET && superuser())
8095 else if (skipIfNoPermissions)
8097 /* if a permissions error should be thrown, let set_config_option do it */
8099 /* test for permissions and valid option value */
8100 (void) set_config_option(name, value,
8101 superuser() ? PGC_SUSET : PGC_USERSET,
8102 PGC_S_TEST, GUC_ACTION_SET, false, 0);
8109 * Called by check_hooks that want to override the normal
8110 * ERRCODE_INVALID_PARAMETER_VALUE SQLSTATE for check hook failures.
8112 * Note that GUC_check_errmsg() etc are just macros that result in a direct
8113 * assignment to the associated variables. That is ugly, but forced by the
8114 * limitations of C's macro mechanisms.
8117 GUC_check_errcode(int sqlerrcode)
8119 GUC_check_errcode_value = sqlerrcode;
8124 * Convenience functions to manage calling a variable's check_hook.
8125 * These mostly take care of the protocol for letting check hooks supply
8126 * portions of the error report on failure.
8130 call_bool_check_hook(struct config_bool * conf, bool *newval, void **extra,
8131 GucSource source, int elevel)
8133 /* Quick success if no hook */
8134 if (!conf->check_hook)
8137 /* Reset variables that might be set by hook */
8138 GUC_check_errcode_value = ERRCODE_INVALID_PARAMETER_VALUE;
8139 GUC_check_errmsg_string = NULL;
8140 GUC_check_errdetail_string = NULL;
8141 GUC_check_errhint_string = NULL;
8143 if (!(*conf->check_hook) (newval, extra, source))
8146 (errcode(GUC_check_errcode_value),
8147 GUC_check_errmsg_string ?
8148 errmsg_internal("%s", GUC_check_errmsg_string) :
8149 errmsg("invalid value for parameter \"%s\": %d",
8150 conf->gen.name, (int) *newval),
8151 GUC_check_errdetail_string ?
8152 errdetail_internal("%s", GUC_check_errdetail_string) : 0,
8153 GUC_check_errhint_string ?
8154 errhint("%s", GUC_check_errhint_string) : 0));
8155 /* Flush any strings created in ErrorContext */
8164 call_int_check_hook(struct config_int * conf, int *newval, void **extra,
8165 GucSource source, int elevel)
8167 /* Quick success if no hook */
8168 if (!conf->check_hook)
8171 /* Reset variables that might be set by hook */
8172 GUC_check_errcode_value = ERRCODE_INVALID_PARAMETER_VALUE;
8173 GUC_check_errmsg_string = NULL;
8174 GUC_check_errdetail_string = NULL;
8175 GUC_check_errhint_string = NULL;
8177 if (!(*conf->check_hook) (newval, extra, source))
8180 (errcode(GUC_check_errcode_value),
8181 GUC_check_errmsg_string ?
8182 errmsg_internal("%s", GUC_check_errmsg_string) :
8183 errmsg("invalid value for parameter \"%s\": %d",
8184 conf->gen.name, *newval),
8185 GUC_check_errdetail_string ?
8186 errdetail_internal("%s", GUC_check_errdetail_string) : 0,
8187 GUC_check_errhint_string ?
8188 errhint("%s", GUC_check_errhint_string) : 0));
8189 /* Flush any strings created in ErrorContext */
8198 call_real_check_hook(struct config_real * conf, double *newval, void **extra,
8199 GucSource source, int elevel)
8201 /* Quick success if no hook */
8202 if (!conf->check_hook)
8205 /* Reset variables that might be set by hook */
8206 GUC_check_errcode_value = ERRCODE_INVALID_PARAMETER_VALUE;
8207 GUC_check_errmsg_string = NULL;
8208 GUC_check_errdetail_string = NULL;
8209 GUC_check_errhint_string = NULL;
8211 if (!(*conf->check_hook) (newval, extra, source))
8214 (errcode(GUC_check_errcode_value),
8215 GUC_check_errmsg_string ?
8216 errmsg_internal("%s", GUC_check_errmsg_string) :
8217 errmsg("invalid value for parameter \"%s\": %g",
8218 conf->gen.name, *newval),
8219 GUC_check_errdetail_string ?
8220 errdetail_internal("%s", GUC_check_errdetail_string) : 0,
8221 GUC_check_errhint_string ?
8222 errhint("%s", GUC_check_errhint_string) : 0));
8223 /* Flush any strings created in ErrorContext */
8232 call_string_check_hook(struct config_string * conf, char **newval, void **extra,
8233 GucSource source, int elevel)
8235 /* Quick success if no hook */
8236 if (!conf->check_hook)
8239 /* Reset variables that might be set by hook */
8240 GUC_check_errcode_value = ERRCODE_INVALID_PARAMETER_VALUE;
8241 GUC_check_errmsg_string = NULL;
8242 GUC_check_errdetail_string = NULL;
8243 GUC_check_errhint_string = NULL;
8245 if (!(*conf->check_hook) (newval, extra, source))
8248 (errcode(GUC_check_errcode_value),
8249 GUC_check_errmsg_string ?
8250 errmsg_internal("%s", GUC_check_errmsg_string) :
8251 errmsg("invalid value for parameter \"%s\": \"%s\"",
8252 conf->gen.name, *newval ? *newval : ""),
8253 GUC_check_errdetail_string ?
8254 errdetail_internal("%s", GUC_check_errdetail_string) : 0,
8255 GUC_check_errhint_string ?
8256 errhint("%s", GUC_check_errhint_string) : 0));
8257 /* Flush any strings created in ErrorContext */
8266 call_enum_check_hook(struct config_enum * conf, int *newval, void **extra,
8267 GucSource source, int elevel)
8269 /* Quick success if no hook */
8270 if (!conf->check_hook)
8273 /* Reset variables that might be set by hook */
8274 GUC_check_errcode_value = ERRCODE_INVALID_PARAMETER_VALUE;
8275 GUC_check_errmsg_string = NULL;
8276 GUC_check_errdetail_string = NULL;
8277 GUC_check_errhint_string = NULL;
8279 if (!(*conf->check_hook) (newval, extra, source))
8282 (errcode(GUC_check_errcode_value),
8283 GUC_check_errmsg_string ?
8284 errmsg_internal("%s", GUC_check_errmsg_string) :
8285 errmsg("invalid value for parameter \"%s\": \"%s\"",
8287 config_enum_lookup_by_value(conf, *newval)),
8288 GUC_check_errdetail_string ?
8289 errdetail_internal("%s", GUC_check_errdetail_string) : 0,
8290 GUC_check_errhint_string ?
8291 errhint("%s", GUC_check_errhint_string) : 0));
8292 /* Flush any strings created in ErrorContext */
8302 * check_hook, assign_hook and show_hook subroutines
8306 check_log_destination(char **newval, void **extra, GucSource source)
8314 /* Need a modifiable copy of string */
8315 rawstring = pstrdup(*newval);
8317 /* Parse string into list of identifiers */
8318 if (!SplitIdentifierString(rawstring, ',', &elemlist))
8320 /* syntax error in list */
8321 GUC_check_errdetail("List syntax is invalid.");
8323 list_free(elemlist);
8327 foreach(l, elemlist)
8329 char *tok = (char *) lfirst(l);
8331 if (pg_strcasecmp(tok, "stderr") == 0)
8332 newlogdest |= LOG_DESTINATION_STDERR;
8333 else if (pg_strcasecmp(tok, "csvlog") == 0)
8334 newlogdest |= LOG_DESTINATION_CSVLOG;
8336 else if (pg_strcasecmp(tok, "syslog") == 0)
8337 newlogdest |= LOG_DESTINATION_SYSLOG;
8340 else if (pg_strcasecmp(tok, "eventlog") == 0)
8341 newlogdest |= LOG_DESTINATION_EVENTLOG;
8345 GUC_check_errdetail("Unrecognized key word: \"%s\".", tok);
8347 list_free(elemlist);
8353 list_free(elemlist);
8355 myextra = (int *) guc_malloc(ERROR, sizeof(int));
8356 *myextra = newlogdest;
8357 *extra = (void *) myextra;
8363 assign_log_destination(const char *newval, void *extra)
8365 Log_destination = *((int *) extra);
8369 assign_syslog_facility(int newval, void *extra)
8372 set_syslog_parameters(syslog_ident_str ? syslog_ident_str : "postgres",
8375 /* Without syslog support, just ignore it */
8379 assign_syslog_ident(const char *newval, void *extra)
8382 set_syslog_parameters(newval, syslog_facility);
8384 /* Without syslog support, it will always be set to "none", so ignore */
8389 assign_session_replication_role(int newval, void *extra)
8392 * Must flush the plan cache when changing replication role; but don't
8393 * flush unnecessarily.
8395 if (SessionReplicationRole != newval)
8400 check_temp_buffers(int *newval, void **extra, GucSource source)
8403 * Once local buffers have been initialized, it's too late to change this.
8405 if (NLocBuffer && NLocBuffer != *newval)
8407 GUC_check_errdetail("\"temp_buffers\" cannot be changed after any temporary tables have been accessed in the session.");
8414 check_phony_autocommit(bool *newval, void **extra, GucSource source)
8418 GUC_check_errcode(ERRCODE_FEATURE_NOT_SUPPORTED);
8419 GUC_check_errmsg("SET AUTOCOMMIT TO OFF is no longer supported");
8426 check_debug_assertions(bool *newval, void **extra, GucSource source)
8428 #ifndef USE_ASSERT_CHECKING
8431 GUC_check_errmsg("assertion checking is not supported by this build");
8439 check_bonjour(bool *newval, void **extra, GucSource source)
8444 GUC_check_errmsg("Bonjour is not supported by this build");
8452 check_ssl(bool *newval, void **extra, GucSource source)
8457 GUC_check_errmsg("SSL is not supported by this build");
8465 check_stage_log_stats(bool *newval, void **extra, GucSource source)
8467 if (*newval && log_statement_stats)
8469 GUC_check_errdetail("Cannot enable parameter when \"log_statement_stats\" is true.");
8476 check_log_stats(bool *newval, void **extra, GucSource source)
8479 (log_parser_stats || log_planner_stats || log_executor_stats))
8481 GUC_check_errdetail("Cannot enable \"log_statement_stats\" when "
8482 "\"log_parser_stats\", \"log_planner_stats\", "
8483 "or \"log_executor_stats\" is true.");
8490 check_canonical_path(char **newval, void **extra, GucSource source)
8493 * Since canonicalize_path never enlarges the string, we can just modify
8494 * newval in-place. But watch out for NULL, which is the default value
8495 * for external_pid_file.
8498 canonicalize_path(*newval);
8503 check_timezone_abbreviations(char **newval, void **extra, GucSource source)
8506 * The boot_val given above for timezone_abbreviations is NULL. When we
8507 * see this we just do nothing. If this value isn't overridden from the
8508 * config file then pg_timezone_abbrev_initialize() will eventually
8509 * replace it with "Default". This hack has two purposes: to avoid
8510 * wasting cycles loading values that might soon be overridden from the
8511 * config file, and to avoid trying to read the timezone abbrev files
8512 * during InitializeGUCOptions(). The latter doesn't work in an
8513 * EXEC_BACKEND subprocess because my_exec_path hasn't been set yet and so
8514 * we can't locate PGSHAREDIR.
8516 if (*newval == NULL)
8518 Assert(source == PGC_S_DEFAULT);
8522 /* OK, load the file and produce a malloc'd TimeZoneAbbrevTable */
8523 *extra = load_tzoffsets(*newval);
8525 /* tzparser.c returns NULL on failure, reporting via GUC_check_errmsg */
8533 assign_timezone_abbreviations(const char *newval, void *extra)
8535 /* Do nothing for the boot_val default of NULL */
8539 InstallTimeZoneAbbrevs((TimeZoneAbbrevTable *) extra);
8543 * pg_timezone_abbrev_initialize --- set default value if not done already
8545 * This is called after initial loading of postgresql.conf. If no
8546 * timezone_abbreviations setting was found therein, select default.
8547 * If a non-default value is already installed, nothing will happen.
8549 * This can also be called from ProcessConfigFile to establish the default
8550 * value after a postgresql.conf entry for it is removed.
8553 pg_timezone_abbrev_initialize(void)
8555 SetConfigOption("timezone_abbreviations", "Default",
8556 PGC_POSTMASTER, PGC_S_DYNAMIC_DEFAULT);
8560 show_archive_command(void)
8562 if (XLogArchivingActive())
8563 return XLogArchiveCommand;
8565 return "(disabled)";
8569 assign_tcp_keepalives_idle(int newval, void *extra)
8572 * The kernel API provides no way to test a value without setting it; and
8573 * once we set it we might fail to unset it. So there seems little point
8574 * in fully implementing the check-then-assign GUC API for these
8575 * variables. Instead we just do the assignment on demand. pqcomm.c
8576 * reports any problems via elog(LOG).
8578 * This approach means that the GUC value might have little to do with the
8579 * actual kernel value, so we use a show_hook that retrieves the kernel
8580 * value rather than trusting GUC's copy.
8582 (void) pq_setkeepalivesidle(newval, MyProcPort);
8586 show_tcp_keepalives_idle(void)
8588 /* See comments in assign_tcp_keepalives_idle */
8589 static char nbuf[16];
8591 snprintf(nbuf, sizeof(nbuf), "%d", pq_getkeepalivesidle(MyProcPort));
8596 assign_tcp_keepalives_interval(int newval, void *extra)
8598 /* See comments in assign_tcp_keepalives_idle */
8599 (void) pq_setkeepalivesinterval(newval, MyProcPort);
8603 show_tcp_keepalives_interval(void)
8605 /* See comments in assign_tcp_keepalives_idle */
8606 static char nbuf[16];
8608 snprintf(nbuf, sizeof(nbuf), "%d", pq_getkeepalivesinterval(MyProcPort));
8613 assign_tcp_keepalives_count(int newval, void *extra)
8615 /* See comments in assign_tcp_keepalives_idle */
8616 (void) pq_setkeepalivescount(newval, MyProcPort);
8620 show_tcp_keepalives_count(void)
8622 /* See comments in assign_tcp_keepalives_idle */
8623 static char nbuf[16];
8625 snprintf(nbuf, sizeof(nbuf), "%d", pq_getkeepalivescount(MyProcPort));
8630 check_maxconnections(int *newval, void **extra, GucSource source)
8632 if (*newval + GetNumShmemAttachedBgworkers() + autovacuum_max_workers + 1 >
8639 check_autovacuum_max_workers(int *newval, void **extra, GucSource source)
8641 if (MaxConnections + *newval + 1 + GetNumShmemAttachedBgworkers() >
8648 check_effective_io_concurrency(int *newval, void **extra, GucSource source)
8651 double new_prefetch_pages = 0.0;
8655 * The user-visible GUC parameter is the number of drives (spindles),
8656 * which we need to translate to a number-of-pages-to-prefetch target.
8657 * The target value is stashed in *extra and then assigned to the actual
8658 * variable by assign_effective_io_concurrency.
8660 * The expected number of prefetch pages needed to keep N drives busy is:
8662 * drives | I/O requests
8663 * -------+----------------
8666 * 3 | 3/1 + 3/2 + 3/3 = 5 1/2
8667 * 4 | 4/1 + 4/2 + 4/3 + 4/4 = 8 1/3
8670 * This is called the "coupon collector problem" and H(n) is called the
8671 * harmonic series. This could be approximated by n * ln(n), but for
8672 * reasonable numbers of drives we might as well just compute the series.
8674 * Alternatively we could set the target to the number of pages necessary
8675 * so that the expected number of active spindles is some arbitrary
8676 * percentage of the total. This sounds the same but is actually slightly
8677 * different. The result ends up being ln(1-P)/ln((n-1)/n) where P is
8678 * that desired fraction.
8680 * Experimental results show that both of these formulas aren't aggressive
8681 * enough, but we don't really have any better proposals.
8683 * Note that if *newval = 0 (disabled), we must set target = 0.
8687 for (i = 1; i <= *newval; i++)
8688 new_prefetch_pages += (double) *newval / (double) i;
8690 /* This range check shouldn't fail, but let's be paranoid */
8691 if (new_prefetch_pages >= 0.0 && new_prefetch_pages < (double) INT_MAX)
8693 int *myextra = (int *) guc_malloc(ERROR, sizeof(int));
8695 *myextra = (int) rint(new_prefetch_pages);
8696 *extra = (void *) myextra;
8704 #endif /* USE_PREFETCH */
8708 assign_effective_io_concurrency(int newval, void *extra)
8711 target_prefetch_pages = *((int *) extra);
8712 #endif /* USE_PREFETCH */
8716 assign_pgstat_temp_directory(const char *newval, void *extra)
8718 /* check_canonical_path already canonicalized newval for us */
8724 dname = guc_malloc(ERROR, strlen(newval) + 1); /* runtime dir */
8725 sprintf(dname, "%s", newval);
8728 tname = guc_malloc(ERROR, strlen(newval) + 12); /* /global.tmp */
8729 sprintf(tname, "%s/global.tmp", newval);
8730 fname = guc_malloc(ERROR, strlen(newval) + 13); /* /global.stat */
8731 sprintf(fname, "%s/global.stat", newval);
8733 if (pgstat_stat_directory)
8734 free(pgstat_stat_directory);
8735 pgstat_stat_directory = dname;
8736 if (pgstat_stat_tmpname)
8737 free(pgstat_stat_tmpname);
8738 pgstat_stat_tmpname = tname;
8739 if (pgstat_stat_filename)
8740 free(pgstat_stat_filename);
8741 pgstat_stat_filename = fname;
8745 check_application_name(char **newval, void **extra, GucSource source)
8747 /* Only allow clean ASCII chars in the application name */
8750 for (p = *newval; *p; p++)
8752 if (*p < 32 || *p > 126)
8760 assign_application_name(const char *newval, void *extra)
8762 /* Update the pg_stat_activity view */
8763 pgstat_report_appname(newval);
8767 show_unix_socket_permissions(void)
8771 snprintf(buf, sizeof(buf), "%04o", Unix_socket_permissions);
8776 show_log_file_mode(void)
8780 snprintf(buf, sizeof(buf), "%04o", Log_file_mode);
8784 #include "guc-file.c"