1 /*-------------------------------------------------------------------------
4 * This file contains general postgres administration and initialization
5 * stuff that used to be spread out between the following files:
6 * globals.h global variables
7 * pdir.h directory path crud
8 * pinit.h postgres initialization
9 * pmod.h processing modes
10 * Over time, this has also become the preferred place for widely known
11 * resource-limitation stuff, such as work_mem and check_stack_depth().
13 * Portions Copyright (c) 1996-2011, PostgreSQL Global Development Group
14 * Portions Copyright (c) 1994, Regents of the University of California
16 * src/include/miscadmin.h
19 * some of the information in this file should be moved to other files.
21 *-------------------------------------------------------------------------
26 #include "pgtime.h" /* for pg_time_t */
29 #define PG_BACKEND_VERSIONSTR "postgres (PostgreSQL) " PG_VERSION "\n"
32 /*****************************************************************************
33 * System interrupt and critical section handling
35 * There are two types of interrupts that a running backend needs to accept
36 * without messing up its state: QueryCancel (SIGINT) and ProcDie (SIGTERM).
37 * In both cases, we need to be able to clean up the current transaction
38 * gracefully, so we can't respond to the interrupt instantaneously ---
39 * there's no guarantee that internal data structures would be self-consistent
40 * if the code is interrupted at an arbitrary instant. Instead, the signal
41 * handlers set flags that are checked periodically during execution.
43 * The CHECK_FOR_INTERRUPTS() macro is called at strategically located spots
44 * where it is normally safe to accept a cancel or die interrupt. In some
45 * cases, we invoke CHECK_FOR_INTERRUPTS() inside low-level subroutines that
46 * might sometimes be called in contexts that do *not* want to allow a cancel
47 * or die interrupt. The HOLD_INTERRUPTS() and RESUME_INTERRUPTS() macros
48 * allow code to ensure that no cancel or die interrupt will be accepted,
49 * even if CHECK_FOR_INTERRUPTS() gets called in a subroutine. The interrupt
50 * will be held off until CHECK_FOR_INTERRUPTS() is done outside any
51 * HOLD_INTERRUPTS() ... RESUME_INTERRUPTS() section.
53 * Special mechanisms are used to let an interrupt be accepted when we are
54 * waiting for a lock or when we are waiting for command input (but, of
55 * course, only if the interrupt holdoff counter is zero). See the
56 * related code for details.
58 * A related, but conceptually distinct, mechanism is the "critical section"
59 * mechanism. A critical section not only holds off cancel/die interrupts,
60 * but causes any ereport(ERROR) or ereport(FATAL) to become ereport(PANIC)
61 * --- that is, a system-wide reset is forced. Needless to say, only really
62 * *critical* code should be marked as a critical section! Currently, this
63 * mechanism is only used for XLOG-related code.
65 *****************************************************************************/
68 /* these are marked volatile because they are set by signal handlers: */
69 extern PGDLLIMPORT volatile bool InterruptPending;
70 extern volatile bool QueryCancelPending;
71 extern volatile bool ProcDiePending;
73 /* these are marked volatile because they are examined by signal handlers: */
74 extern volatile bool ImmediateInterruptOK;
75 extern PGDLLIMPORT volatile uint32 InterruptHoldoffCount;
76 extern PGDLLIMPORT volatile uint32 CritSectionCount;
78 /* in tcop/postgres.c */
79 extern void ProcessInterrupts(void);
83 #define CHECK_FOR_INTERRUPTS() \
85 if (InterruptPending) \
86 ProcessInterrupts(); \
90 #define CHECK_FOR_INTERRUPTS() \
92 if (UNBLOCKED_SIGNAL_QUEUE()) \
93 pgwin32_dispatch_queued_signals(); \
94 if (InterruptPending) \
95 ProcessInterrupts(); \
100 #define HOLD_INTERRUPTS() (InterruptHoldoffCount++)
102 #define RESUME_INTERRUPTS() \
104 Assert(InterruptHoldoffCount > 0); \
105 InterruptHoldoffCount--; \
108 #define START_CRIT_SECTION() (CritSectionCount++)
110 #define END_CRIT_SECTION() \
112 Assert(CritSectionCount > 0); \
113 CritSectionCount--; \
117 /*****************************************************************************
119 *****************************************************************************/
122 * from utils/init/globals.c
124 extern pid_t PostmasterPid;
125 extern bool IsPostmasterEnvironment;
126 extern PGDLLIMPORT bool IsUnderPostmaster;
127 extern bool IsBinaryUpgrade;
129 extern bool ExitOnAnyError;
131 extern PGDLLIMPORT char *DataDir;
133 extern PGDLLIMPORT int NBuffers;
134 extern int MaxBackends;
135 extern int MaxConnections;
137 extern PGDLLIMPORT int MyProcPid;
138 extern PGDLLIMPORT pg_time_t MyStartTime;
139 extern PGDLLIMPORT struct Port *MyProcPort;
140 extern long MyCancelKey;
141 extern int MyPMChildSlot;
143 extern char OutputFileName[];
144 extern PGDLLIMPORT char my_exec_path[];
145 extern char pkglib_path[];
148 extern char postgres_exec_path[];
152 * done in storage/backendid.h for now.
154 * extern BackendId MyBackendId;
156 extern PGDLLIMPORT Oid MyDatabaseId;
158 extern PGDLLIMPORT Oid MyDatabaseTableSpace;
161 * Date/Time Configuration
163 * DateStyle defines the output formatting choice for date/time types:
164 * USE_POSTGRES_DATES specifies traditional Postgres format
165 * USE_ISO_DATES specifies ISO-compliant format
166 * USE_SQL_DATES specifies Oracle/Ingres-compliant format
167 * USE_GERMAN_DATES specifies German-style dd.mm/yyyy
169 * DateOrder defines the field order to be assumed when reading an
170 * ambiguous date (anything not in YYYY-MM-DD format, with a four-digit
171 * year field first, is taken to be ambiguous):
172 * DATEORDER_YMD specifies field order yy-mm-dd
173 * DATEORDER_DMY specifies field order dd-mm-yy ("European" convention)
174 * DATEORDER_MDY specifies field order mm-dd-yy ("US" convention)
176 * In the Postgres and SQL DateStyles, DateOrder also selects output field
177 * order: day comes before month in DMY style, else month comes before day.
179 * The user-visible "DateStyle" run-time parameter subsumes both of these.
182 /* valid DateStyle values */
183 #define USE_POSTGRES_DATES 0
184 #define USE_ISO_DATES 1
185 #define USE_SQL_DATES 2
186 #define USE_GERMAN_DATES 3
187 #define USE_XSD_DATES 4
189 /* valid DateOrder values */
190 #define DATEORDER_YMD 0
191 #define DATEORDER_DMY 1
192 #define DATEORDER_MDY 2
194 extern int DateStyle;
195 extern int DateOrder;
199 * INTSTYLE_POSTGRES Like Postgres < 8.4 when DateStyle = 'iso'
200 * INTSTYLE_POSTGRES_VERBOSE Like Postgres < 8.4 when DateStyle != 'iso'
201 * INTSTYLE_SQL_STANDARD SQL standard interval literals
202 * INTSTYLE_ISO_8601 ISO-8601-basic formatted intervals
204 #define INTSTYLE_POSTGRES 0
205 #define INTSTYLE_POSTGRES_VERBOSE 1
206 #define INTSTYLE_SQL_STANDARD 2
207 #define INTSTYLE_ISO_8601 3
209 extern int IntervalStyle;
212 * HasCTZSet is true if user has set timezone as a numeric offset from UTC.
213 * If so, CTimeZone is the timezone offset in seconds (using the Unix-ish
214 * sign convention, ie, positive offset is west of UTC, rather than the
215 * SQL-ish convention that positive is east of UTC).
217 extern bool HasCTZSet;
218 extern int CTimeZone;
220 #define MAXTZLEN 10 /* max TZ name len, not counting tr. null */
222 extern bool enableFsync;
223 extern bool allowSystemTableMods;
224 extern PGDLLIMPORT int work_mem;
225 extern PGDLLIMPORT int maintenance_work_mem;
227 extern int VacuumCostPageHit;
228 extern int VacuumCostPageMiss;
229 extern int VacuumCostPageDirty;
230 extern int VacuumCostLimit;
231 extern int VacuumCostDelay;
233 extern int VacuumPageHit;
234 extern int VacuumPageMiss;
235 extern int VacuumPageDirty;
237 extern int VacuumCostBalance;
238 extern bool VacuumCostActive;
241 /* in tcop/postgres.c */
242 extern void check_stack_depth(void);
244 /* in tcop/utility.c */
245 extern void PreventCommandIfReadOnly(const char *cmdname);
246 extern void PreventCommandDuringRecovery(const char *cmdname);
248 /* in utils/misc/guc.c */
249 extern int trace_recovery_messages;
250 extern int trace_recovery(int trace_level);
252 /*****************************************************************************
254 * POSTGRES directory path definitions. *
255 *****************************************************************************/
257 /* flags to be OR'd to form sec_context */
258 #define SECURITY_LOCAL_USERID_CHANGE 0x0001
259 #define SECURITY_RESTRICTED_OPERATION 0x0002
261 extern char *DatabasePath;
263 /* now in utils/init/miscinit.c */
264 extern void SetDatabasePath(const char *path);
266 extern char *GetUserNameFromId(Oid roleid);
267 extern Oid GetUserId(void);
268 extern Oid GetOuterUserId(void);
269 extern Oid GetSessionUserId(void);
270 extern void GetUserIdAndSecContext(Oid *userid, int *sec_context);
271 extern void SetUserIdAndSecContext(Oid userid, int sec_context);
272 extern bool InLocalUserIdChange(void);
273 extern bool InSecurityRestrictedOperation(void);
274 extern void GetUserIdAndContext(Oid *userid, bool *sec_def_context);
275 extern void SetUserIdAndContext(Oid userid, bool sec_def_context);
276 extern void InitializeSessionUserId(const char *rolename);
277 extern void InitializeSessionUserIdStandalone(void);
278 extern void SetSessionAuthorization(Oid userid, bool is_superuser);
279 extern Oid GetCurrentRoleId(void);
280 extern void SetCurrentRoleId(Oid roleid, bool is_superuser);
282 extern void SetDataDir(const char *dir);
283 extern void ChangeToDataDir(void);
284 extern char *make_absolute_path(const char *path);
286 /* in utils/misc/superuser.c */
287 extern bool superuser(void); /* current user is superuser */
288 extern bool superuser_arg(Oid roleid); /* given user is superuser */
291 /*****************************************************************************
293 * POSTGRES processing mode definitions. *
294 *****************************************************************************/
298 * There are three processing modes in POSTGRES. They are
299 * BootstrapProcessing or "bootstrap," InitProcessing or
300 * "initialization," and NormalProcessing or "normal."
302 * The first two processing modes are used during special times. When the
303 * system state indicates bootstrap processing, transactions are all given
304 * transaction id "one" and are consequently guaranteed to commit. This mode
305 * is used during the initial generation of template databases.
307 * Initialization mode: used while starting a backend, until all normal
308 * initialization is complete. Some code behaves differently when executed
309 * in this mode to enable system bootstrapping.
311 * If a POSTGRES binary is in normal mode, then all code may be executed
315 typedef enum ProcessingMode
317 BootstrapProcessing, /* bootstrap creation of template database */
318 InitProcessing, /* initializing system */
319 NormalProcessing /* normal processing */
322 extern ProcessingMode Mode;
324 #define IsBootstrapProcessingMode() ((bool)(Mode == BootstrapProcessing))
325 #define IsInitProcessingMode() ((bool)(Mode == InitProcessing))
326 #define IsNormalProcessingMode() ((bool)(Mode == NormalProcessing))
328 #define SetProcessingMode(mode) \
330 AssertArg((mode) == BootstrapProcessing || \
331 (mode) == InitProcessing || \
332 (mode) == NormalProcessing); \
336 #define GetProcessingMode() Mode
339 /*****************************************************************************
341 * POSTGRES initialization and cleanup definitions. *
342 *****************************************************************************/
344 /* in utils/init/postinit.c */
345 extern void pg_split_opts(char **argv, int *argcp, char *optstr);
346 extern void InitPostgres(const char *in_dbname, Oid dboid, const char *username,
348 extern void BaseInit(void);
350 /* in utils/init/miscinit.c */
351 extern bool IgnoreSystemIndexes;
352 extern PGDLLIMPORT bool process_shared_preload_libraries_in_progress;
353 extern char *shared_preload_libraries_string;
354 extern char *local_preload_libraries_string;
357 * As of 9.1, the contents of the data-directory lock file are:
360 * 1 postmaster PID (or negative of a standalone backend's PID)
361 * 2 data directory path
362 * 3 postmaster start timestamp (time_t representation)
364 * 5 socket directory path (empty on Windows)
365 * 6 first listen_address (IP address or "*"; empty if no TCP port)
366 * 7 shared memory key (not present on Windows)
368 * Lines 6 and up are added via AddToDataDirLockFile() after initial file
369 * creation; they have to be ordered according to time of addition.
371 * The socket lock file, if used, has the same contents as lines 1-5.
373 #define LOCK_FILE_LINE_PID 1
374 #define LOCK_FILE_LINE_DATA_DIR 2
375 #define LOCK_FILE_LINE_START_TIME 3
376 #define LOCK_FILE_LINE_PORT 4
377 #define LOCK_FILE_LINE_SOCKET_DIR 5
378 #define LOCK_FILE_LINE_LISTEN_ADDR 6
379 #define LOCK_FILE_LINE_SHMEM_KEY 7
381 extern void CreateDataDirLockFile(bool amPostmaster);
382 extern void CreateSocketLockFile(const char *socketfile, bool amPostmaster);
383 extern void TouchSocketLockFile(void);
384 extern void AddToDataDirLockFile(int target_line, const char *str);
385 extern void ValidatePgVersion(const char *path);
386 extern void process_shared_preload_libraries(void);
387 extern void process_local_preload_libraries(void);
388 extern void pg_bindtextdomain(const char *domain);
389 extern bool is_authenticated_user_replication_role(void);
391 /* in access/transam/xlog.c */
392 extern bool BackupInProgress(void);
393 extern void CancelBackup(void);
395 #endif /* MISCADMIN_H */