1 /*--------------------------------------------------------------------
4 * External declarations pertaining to backend/utils/misc/guc.c and
5 * backend/utils/misc/guc-file.l
7 * Copyright (c) 2000-2019, PostgreSQL Global Development Group
8 * Written by Peter Eisentraut <peter_e@gmx.net>.
10 * src/include/utils/guc.h
11 *--------------------------------------------------------------------
16 #include "nodes/parsenodes.h"
17 #include "tcop/dest.h"
18 #include "utils/array.h"
21 /* upper limit for GUC variables measured in kilobytes of memory */
22 /* note that various places assume the byte size fits in a "long" variable */
23 #if SIZEOF_SIZE_T > 4 && SIZEOF_LONG > 4
24 #define MAX_KILOBYTES INT_MAX
26 #define MAX_KILOBYTES (INT_MAX / 1024)
30 * Automatic configuration file name for ALTER SYSTEM.
31 * This file will be used to store values of configuration parameters
32 * set by ALTER SYSTEM command.
34 #define PG_AUTOCONF_FILENAME "postgresql.auto.conf"
37 * Certain options can only be set at certain times. The rules are
40 * INTERNAL options cannot be set by the user at all, but only through
41 * internal processes ("server_version" is an example). These are GUC
42 * variables only so they can be shown by SHOW, etc.
44 * POSTMASTER options can only be set when the postmaster starts,
45 * either from the configuration file or the command line.
47 * SIGHUP options can only be set at postmaster startup or by changing
48 * the configuration file and sending the HUP signal to the postmaster
49 * or a backend process. (Notice that the signal receipt will not be
50 * evaluated immediately. The postmaster and the backend check it at a
51 * certain point in their main loop. It's safer to wait than to read a
52 * file asynchronously.)
54 * BACKEND and SU_BACKEND options can only be set at postmaster startup,
55 * from the configuration file, or by client request in the connection
56 * startup packet (e.g., from libpq's PGOPTIONS variable). SU_BACKEND
57 * options can be set from the startup packet only when the user is a
58 * superuser. Furthermore, an already-started backend will ignore changes
59 * to such an option in the configuration file. The idea is that these
60 * options are fixed for a given backend once it's started, but they can
61 * vary across backends.
63 * SUSET options can be set at postmaster startup, with the SIGHUP
64 * mechanism, or from the startup packet or SQL if you're a superuser.
66 * USERSET options can be set by anyone any time.
80 * The following type records the source of the current setting. A
81 * new setting can only take effect if the previous setting had the
82 * same or lower level. (E.g, changing the config file doesn't
83 * override the postmaster command line.) Tracking the source allows us
84 * to process sources in any convenient order without affecting results.
85 * Sources <= PGC_S_OVERRIDE will set the default used by RESET, as well
86 * as the current value. Note that source == PGC_S_OVERRIDE should be
87 * used when setting a PGC_INTERNAL option.
89 * PGC_S_INTERACTIVE isn't actually a source value, but is the
90 * dividing line between "interactive" and "non-interactive" sources for
91 * error reporting purposes.
93 * PGC_S_TEST is used when testing values to be used later ("doit" will always
94 * be false, so this never gets stored as the actual source of any value).
95 * For example, ALTER DATABASE/ROLE tests proposed per-database or per-user
96 * defaults this way, and CREATE FUNCTION tests proposed function SET clauses
97 * this way. This is an interactive case, but it needs its own source value
98 * because some assign hooks need to make different validity checks in this
99 * case. In particular, references to nonexistent database objects generally
100 * shouldn't throw hard errors in this case, at most NOTICEs, since the
101 * objects might exist by the time the setting is used for real.
103 * NB: see GucSource_Names in guc.c if you change this.
107 PGC_S_DEFAULT, /* hard-wired default ("boot_val") */
108 PGC_S_DYNAMIC_DEFAULT, /* default computed during initialization */
109 PGC_S_ENV_VAR, /* postmaster environment variable */
110 PGC_S_FILE, /* postgresql.conf */
111 PGC_S_ARGV, /* postmaster command line */
112 PGC_S_GLOBAL, /* global in-database setting */
113 PGC_S_DATABASE, /* per-database setting */
114 PGC_S_USER, /* per-user setting */
115 PGC_S_DATABASE_USER, /* per-user-and-database setting */
116 PGC_S_CLIENT, /* from client connection request */
117 PGC_S_OVERRIDE, /* special case to forcibly set default */
118 PGC_S_INTERACTIVE, /* dividing line for error reporting */
119 PGC_S_TEST, /* test per-database or per-user setting */
120 PGC_S_SESSION /* SET command */
124 * Parsing the configuration file(s) will return a list of name-value pairs
125 * with source location info. We also abuse this data structure to carry
126 * error reports about the config files. An entry reporting an error will
127 * have errmsg != NULL, and might have NULLs for name, value, and/or filename.
129 * If "ignore" is true, don't attempt to apply the item (it might be an error
130 * report, or an item we determined to be duplicate). "applied" is set true
131 * if we successfully applied, or could have applied, the setting.
133 typedef struct ConfigVariable
142 struct ConfigVariable *next;
145 extern bool ParseConfigFile(const char *config_file, bool strict,
146 const char *calling_file, int calling_lineno,
147 int depth, int elevel,
148 ConfigVariable **head_p, ConfigVariable **tail_p);
149 extern bool ParseConfigFp(FILE *fp, const char *config_file,
150 int depth, int elevel,
151 ConfigVariable **head_p, ConfigVariable **tail_p);
152 extern bool ParseConfigDirectory(const char *includedir,
153 const char *calling_file, int calling_lineno,
154 int depth, int elevel,
155 ConfigVariable **head_p,
156 ConfigVariable **tail_p);
157 extern void FreeConfigVariables(ConfigVariable *list);
160 * The possible values of an enum variable are specified by an array of
161 * name-value pairs. The "hidden" flag means the value is accepted but
162 * won't be displayed when guc.c is asked for a list of acceptable values.
164 struct config_enum_entry
172 * Signatures for per-variable check/assign/show hook functions
174 typedef bool (*GucBoolCheckHook) (bool *newval, void **extra, GucSource source);
175 typedef bool (*GucIntCheckHook) (int *newval, void **extra, GucSource source);
176 typedef bool (*GucRealCheckHook) (double *newval, void **extra, GucSource source);
177 typedef bool (*GucStringCheckHook) (char **newval, void **extra, GucSource source);
178 typedef bool (*GucEnumCheckHook) (int *newval, void **extra, GucSource source);
180 typedef void (*GucBoolAssignHook) (bool newval, void *extra);
181 typedef void (*GucIntAssignHook) (int newval, void *extra);
182 typedef void (*GucRealAssignHook) (double newval, void *extra);
183 typedef void (*GucStringAssignHook) (const char *newval, void *extra);
184 typedef void (*GucEnumAssignHook) (int newval, void *extra);
186 typedef const char *(*GucShowHook) (void);
193 /* Types of set_config_option actions */
194 GUC_ACTION_SET, /* regular SET command */
195 GUC_ACTION_LOCAL, /* SET LOCAL command */
196 GUC_ACTION_SAVE /* function SET option, or temp assignment */
199 #define GUC_QUALIFIER_SEPARATOR '.'
202 * bit values in "flags" of a GUC variable
204 #define GUC_LIST_INPUT 0x0001 /* input can be list format */
205 #define GUC_LIST_QUOTE 0x0002 /* double-quote list elements */
206 #define GUC_NO_SHOW_ALL 0x0004 /* exclude from SHOW ALL */
207 #define GUC_NO_RESET_ALL 0x0008 /* exclude from RESET ALL */
208 #define GUC_REPORT 0x0010 /* auto-report changes to client */
209 #define GUC_NOT_IN_SAMPLE 0x0020 /* not in postgresql.conf.sample */
210 #define GUC_DISALLOW_IN_FILE 0x0040 /* can't set in postgresql.conf */
211 #define GUC_CUSTOM_PLACEHOLDER 0x0080 /* placeholder for custom variable */
212 #define GUC_SUPERUSER_ONLY 0x0100 /* show only to superusers */
213 #define GUC_IS_NAME 0x0200 /* limit string to NAMEDATALEN-1 */
214 #define GUC_NOT_WHILE_SEC_REST 0x0400 /* can't set if security restricted */
215 #define GUC_DISALLOW_IN_AUTO_FILE 0x0800 /* can't set in
216 * PG_AUTOCONF_FILENAME */
218 #define GUC_UNIT_KB 0x1000 /* value is in kilobytes */
219 #define GUC_UNIT_BLOCKS 0x2000 /* value is in blocks */
220 #define GUC_UNIT_XBLOCKS 0x3000 /* value is in xlog blocks */
221 #define GUC_UNIT_MB 0x4000 /* value is in megabytes */
222 #define GUC_UNIT_BYTE 0x8000 /* value is in bytes */
223 #define GUC_UNIT_MEMORY 0xF000 /* mask for size-related units */
225 #define GUC_UNIT_MS 0x10000 /* value is in milliseconds */
226 #define GUC_UNIT_S 0x20000 /* value is in seconds */
227 #define GUC_UNIT_MIN 0x30000 /* value is in minutes */
228 #define GUC_UNIT_TIME 0xF0000 /* mask for time-related units */
230 #define GUC_EXPLAIN 0x100000 /* include in explain */
232 #define GUC_UNIT (GUC_UNIT_MEMORY | GUC_UNIT_TIME)
235 /* GUC vars that are actually declared in guc.c, rather than elsewhere */
236 extern bool log_duration;
237 extern bool Debug_print_plan;
238 extern bool Debug_print_parse;
239 extern bool Debug_print_rewritten;
240 extern bool Debug_pretty_print;
242 extern bool log_parser_stats;
243 extern bool log_planner_stats;
244 extern bool log_executor_stats;
245 extern bool log_statement_stats;
246 extern bool log_btree_build_stats;
248 extern PGDLLIMPORT bool check_function_bodies;
249 extern bool session_auth_is_superuser;
251 extern int log_min_error_statement;
252 extern PGDLLIMPORT int log_min_messages;
253 extern PGDLLIMPORT int client_min_messages;
254 extern int log_min_duration_statement;
255 extern int log_temp_files;
256 extern double log_xact_sample_rate;
258 extern int temp_file_limit;
260 extern int num_temp_buffers;
262 extern char *cluster_name;
263 extern PGDLLIMPORT char *ConfigFileName;
264 extern char *HbaFileName;
265 extern char *IdentFileName;
266 extern char *external_pid_file;
268 extern PGDLLIMPORT char *application_name;
270 extern int tcp_keepalives_idle;
271 extern int tcp_keepalives_interval;
272 extern int tcp_keepalives_count;
273 extern int tcp_user_timeout;
276 extern bool trace_sort;
280 * Functions exported by guc.c
282 extern void SetConfigOption(const char *name, const char *value,
283 GucContext context, GucSource source);
285 extern void DefineCustomBoolVariable(const char *name,
286 const char *short_desc,
287 const char *long_desc,
292 GucBoolCheckHook check_hook,
293 GucBoolAssignHook assign_hook,
294 GucShowHook show_hook);
296 extern void DefineCustomIntVariable(const char *name,
297 const char *short_desc,
298 const char *long_desc,
305 GucIntCheckHook check_hook,
306 GucIntAssignHook assign_hook,
307 GucShowHook show_hook);
309 extern void DefineCustomRealVariable(const char *name,
310 const char *short_desc,
311 const char *long_desc,
318 GucRealCheckHook check_hook,
319 GucRealAssignHook assign_hook,
320 GucShowHook show_hook);
322 extern void DefineCustomStringVariable(const char *name,
323 const char *short_desc,
324 const char *long_desc,
326 const char *bootValue,
329 GucStringCheckHook check_hook,
330 GucStringAssignHook assign_hook,
331 GucShowHook show_hook);
333 extern void DefineCustomEnumVariable(const char *name,
334 const char *short_desc,
335 const char *long_desc,
338 const struct config_enum_entry *options,
341 GucEnumCheckHook check_hook,
342 GucEnumAssignHook assign_hook,
343 GucShowHook show_hook);
345 extern void EmitWarningsOnPlaceholders(const char *className);
347 extern const char *GetConfigOption(const char *name, bool missing_ok,
348 bool restrict_privileged);
349 extern const char *GetConfigOptionResetString(const char *name);
350 extern int GetConfigOptionFlags(const char *name, bool missing_ok);
351 extern void ProcessConfigFile(GucContext context);
352 extern void InitializeGUCOptions(void);
353 extern bool SelectConfigFiles(const char *userDoption, const char *progname);
354 extern void ResetAllOptions(void);
355 extern void AtStart_GUC(void);
356 extern int NewGUCNestLevel(void);
357 extern void AtEOXact_GUC(bool isCommit, int nestLevel);
358 extern void BeginReportingGUCOptions(void);
359 extern void ParseLongOption(const char *string, char **name, char **value);
360 extern bool parse_int(const char *value, int *result, int flags,
361 const char **hintmsg);
362 extern bool parse_real(const char *value, double *result, int flags,
363 const char **hintmsg);
364 extern int set_config_option(const char *name, const char *value,
365 GucContext context, GucSource source,
366 GucAction action, bool changeVal, int elevel,
368 extern void AlterSystemSetConfigFile(AlterSystemStmt *altersysstmt);
369 extern char *GetConfigOptionByName(const char *name, const char **varname,
371 extern void GetConfigOptionByNum(int varnum, const char **values, bool *noshow);
372 extern int GetNumConfigOptions(void);
374 extern void SetPGVariable(const char *name, List *args, bool is_local);
375 extern void GetPGVariable(const char *name, DestReceiver *dest);
376 extern TupleDesc GetPGVariableResultDesc(const char *name);
378 extern void ExecSetVariableStmt(VariableSetStmt *stmt, bool isTopLevel);
379 extern char *ExtractSetVariableArgs(VariableSetStmt *stmt);
381 extern void ProcessGUCArray(ArrayType *array,
382 GucContext context, GucSource source, GucAction action);
383 extern ArrayType *GUCArrayAdd(ArrayType *array, const char *name, const char *value);
384 extern ArrayType *GUCArrayDelete(ArrayType *array, const char *name);
385 extern ArrayType *GUCArrayReset(ArrayType *array);
388 extern void write_nondefault_variables(GucContext context);
389 extern void read_nondefault_variables(void);
392 /* GUC serialization */
393 extern Size EstimateGUCStateSpace(void);
394 extern void SerializeGUCState(Size maxsize, char *start_address);
395 extern void RestoreGUCState(void *gucstate);
397 /* Support for messages reported from GUC check hooks */
399 extern PGDLLIMPORT char *GUC_check_errmsg_string;
400 extern PGDLLIMPORT char *GUC_check_errdetail_string;
401 extern PGDLLIMPORT char *GUC_check_errhint_string;
403 extern void GUC_check_errcode(int sqlerrcode);
405 #define GUC_check_errmsg \
406 pre_format_elog_string(errno, TEXTDOMAIN), \
407 GUC_check_errmsg_string = format_elog_string
409 #define GUC_check_errdetail \
410 pre_format_elog_string(errno, TEXTDOMAIN), \
411 GUC_check_errdetail_string = format_elog_string
413 #define GUC_check_errhint \
414 pre_format_elog_string(errno, TEXTDOMAIN), \
415 GUC_check_errhint_string = format_elog_string
419 * The following functions are not in guc.c, but are declared here to avoid
420 * having to include guc.h in some widely used headers that it really doesn't
424 /* in commands/tablespace.c */
425 extern bool check_default_tablespace(char **newval, void **extra, GucSource source);
426 extern bool check_temp_tablespaces(char **newval, void **extra, GucSource source);
427 extern void assign_temp_tablespaces(const char *newval, void *extra);
429 /* in catalog/namespace.c */
430 extern bool check_search_path(char **newval, void **extra, GucSource source);
431 extern void assign_search_path(const char *newval, void *extra);
433 /* in access/transam/xlog.c */
434 extern bool check_wal_buffers(int *newval, void **extra, GucSource source);
435 extern void assign_xlog_sync_method(int new_sync_method, void *extra);