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
12 * Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
13 * Portions Copyright (c) 1994, Regents of the University of California
15 * $PostgreSQL: pgsql/src/include/miscadmin.h,v 1.141 2004/01/06 17:36:31 neilc Exp $
18 * some of the information in this file should be moved to
21 *-------------------------------------------------------------------------
28 /*****************************************************************************
29 * System interrupt and critical section handling
31 * There are two types of interrupts that a running backend needs to accept
32 * without messing up its state: QueryCancel (SIGINT) and ProcDie (SIGTERM).
33 * In both cases, we need to be able to clean up the current transaction
34 * gracefully, so we can't respond to the interrupt instantaneously ---
35 * there's no guarantee that internal data structures would be self-consistent
36 * if the code is interrupted at an arbitrary instant. Instead, the signal
37 * handlers set flags that are checked periodically during execution.
39 * The CHECK_FOR_INTERRUPTS() macro is called at strategically located spots
40 * where it is normally safe to accept a cancel or die interrupt. In some
41 * cases, we invoke CHECK_FOR_INTERRUPTS() inside low-level subroutines that
42 * might sometimes be called in contexts that do *not* want to allow a cancel
43 * or die interrupt. The HOLD_INTERRUPTS() and RESUME_INTERRUPTS() macros
44 * allow code to ensure that no cancel or die interrupt will be accepted,
45 * even if CHECK_FOR_INTERRUPTS() gets called in a subroutine. The interrupt
46 * will be held off until CHECK_FOR_INTERRUPTS() is done outside any
47 * HOLD_INTERRUPTS() ... RESUME_INTERRUPTS() section.
49 * Special mechanisms are used to let an interrupt be accepted when we are
50 * waiting for a lock or when we are waiting for command input (but, of
51 * course, only if the interrupt holdoff counter is zero). See the
52 * related code for details.
54 * A related, but conceptually distinct, mechanism is the "critical section"
55 * mechanism. A critical section not only holds off cancel/die interrupts,
56 * but causes any ereport(ERROR) or ereport(FATAL) to become ereport(PANIC)
57 * --- that is, a system-wide reset is forced. Needless to say, only really
58 * *critical* code should be marked as a critical section! Currently, this
59 * mechanism is only used for XLOG-related code.
61 *****************************************************************************/
64 /* these are marked volatile because they are set by signal handlers: */
65 extern DLLIMPORT volatile bool InterruptPending;
66 extern volatile bool QueryCancelPending;
67 extern volatile bool ProcDiePending;
69 /* these are marked volatile because they are examined by signal handlers: */
70 extern volatile bool ImmediateInterruptOK;
71 extern volatile uint32 InterruptHoldoffCount;
72 extern volatile uint32 CritSectionCount;
75 extern void ProcessInterrupts(void);
77 #define CHECK_FOR_INTERRUPTS() \
79 if (InterruptPending) \
80 ProcessInterrupts(); \
83 #define HOLD_INTERRUPTS() (InterruptHoldoffCount++)
85 #define RESUME_INTERRUPTS() \
87 Assert(InterruptHoldoffCount > 0); \
88 InterruptHoldoffCount--; \
91 #define START_CRIT_SECTION() (CritSectionCount++)
93 #define END_CRIT_SECTION() \
95 Assert(CritSectionCount > 0); \
99 #define PG_DELAY(_msec) \
101 struct timeval delay; \
102 delay.tv_sec = (_msec) / 1000; \
103 delay.tv_usec = ((_msec) % 1000) * 1000; \
104 (void) select(0, NULL, NULL, NULL, &delay); \
107 /*****************************************************************************
109 *****************************************************************************/
112 * from postmaster/postmaster.c
114 extern bool ClientAuthInProgress;
115 extern const bool ExecBackend;
117 extern int PostmasterMain(int argc, char *argv[]);
118 extern void ClosePostmasterPorts(bool pgstat_too);
121 * from utils/init/globals.c
123 extern bool IsPostmasterEnvironment;
124 extern bool IsUnderPostmaster;
126 extern bool ExitOnAnyError;
128 extern char *DataDir;
130 extern DLLIMPORT int MyProcPid;
131 extern struct Port *MyProcPort;
132 extern long MyCancelKey;
134 extern char OutputFileName[];
135 extern char pg_pathname[];
138 * done in storage/backendid.h for now.
140 * extern BackendId MyBackendId;
142 extern DLLIMPORT Oid MyDatabaseId;
145 * Date/Time Configuration
147 * DateStyle defines the output formatting choice for date/time types:
148 * USE_POSTGRES_DATES specifies traditional Postgres format
149 * USE_ISO_DATES specifies ISO-compliant format
150 * USE_SQL_DATES specifies Oracle/Ingres-compliant format
151 * USE_GERMAN_DATES specifies German-style dd.mm/yyyy
153 * DateOrder defines the field order to be assumed when reading an
154 * ambiguous date (anything not in YYYY-MM-DD format, with a four-digit
155 * year field first, is taken to be ambiguous):
156 * DATEORDER_YMD specifies field order yy-mm-dd
157 * DATEORDER_DMY specifies field order dd-mm-yy ("European" convention)
158 * DATEORDER_MDY specifies field order mm-dd-yy ("US" convention)
160 * In the Postgres and SQL DateStyles, DateOrder also selects output field
161 * order: day comes before month in DMY style, else month comes before day.
163 * The user-visible "DateStyle" run-time parameter subsumes both of these.
166 /* valid DateStyle values */
167 #define USE_POSTGRES_DATES 0
168 #define USE_ISO_DATES 1
169 #define USE_SQL_DATES 2
170 #define USE_GERMAN_DATES 3
172 /* valid DateOrder values */
173 #define DATEORDER_YMD 0
174 #define DATEORDER_DMY 1
175 #define DATEORDER_MDY 2
177 extern int DateStyle;
178 extern int DateOrder;
181 * HasCTZSet is true if user has set timezone as a numeric offset from UTC.
182 * If so, CTimeZone is the timezone offset in seconds (using the Unix-ish
183 * sign convention, ie, positive offset is west of UTC, rather than the
184 * SQL-ish convention that positive is east of UTC).
186 extern bool HasCTZSet;
187 extern int CTimeZone;
189 #define MAXTZLEN 10 /* max TZ name len, not counting tr. null */
191 extern bool enableFsync;
192 extern bool allowSystemTableMods;
193 extern DLLIMPORT int SortMem;
194 extern int VacuumMem;
197 * A few postmaster startup options are exported here so the
198 * configuration file processor can access them.
200 extern bool NetServer;
201 extern bool EnableSSL;
202 extern bool SilentMode;
203 extern int MaxBackends;
204 extern int ReservedBackends;
205 extern DLLIMPORT int NBuffers;
206 extern int PostPortNumber;
207 extern int Unix_socket_permissions;
208 extern char *Unix_socket_group;
209 extern char *UnixSocketDir;
210 extern char *VirtualHost;
213 /*****************************************************************************
215 * POSTGRES directory path definitions. *
216 *****************************************************************************/
218 extern char *DatabasePath;
220 /* in utils/misc/database.c */
221 extern void GetRawDatabaseInfo(const char *name, Oid *db_id, char *path);
222 extern char *ExpandDatabasePath(const char *path);
224 /* now in utils/init/miscinit.c */
225 extern void SetDatabasePath(const char *path);
227 extern char *GetUserNameFromId(AclId userid);
228 extern AclId GetUserId(void);
229 extern void SetUserId(AclId userid);
230 extern AclId GetSessionUserId(void);
231 extern void SetSessionUserId(AclId userid);
232 extern void InitializeSessionUserId(const char *username);
233 extern void InitializeSessionUserIdStandalone(void);
234 extern void SetSessionAuthorization(AclId userid, bool is_superuser);
236 extern void SetDataDir(const char *dir);
238 extern int FindExec(char *full_path, const char *argv0,
239 const char *binary_name);
240 extern int CheckPathAccess(char *path, char *name, int open_mode);
242 /* in utils/misc/superuser.c */
243 extern bool superuser(void); /* current user is superuser */
244 extern bool superuser_arg(AclId userid); /* given user is superuser */
247 /*****************************************************************************
249 * POSTGRES processing mode definitions. *
250 *****************************************************************************/
254 * There are three processing modes in POSTGRES. They are
255 * BootstrapProcessing or "bootstrap," InitProcessing or
256 * "initialization," and NormalProcessing or "normal."
258 * The first two processing modes are used during special times. When the
259 * system state indicates bootstrap processing, transactions are all given
260 * transaction id "one" and are consequently guaranteed to commit. This mode
261 * is used during the initial generation of template databases.
263 * Initialization mode: used while starting a backend, until all normal
264 * initialization is complete. Some code behaves differently when executed
265 * in this mode to enable system bootstrapping.
267 * If a POSTGRES binary is in normal mode, then all code may be executed
271 typedef enum ProcessingMode
273 BootstrapProcessing, /* bootstrap creation of template database */
274 InitProcessing, /* initializing system */
275 NormalProcessing /* normal processing */
278 extern ProcessingMode Mode;
280 #define IsBootstrapProcessingMode() ((bool)(Mode == BootstrapProcessing))
281 #define IsInitProcessingMode() ((bool)(Mode == InitProcessing))
282 #define IsNormalProcessingMode() ((bool)(Mode == NormalProcessing))
284 #define SetProcessingMode(mode) \
286 AssertArg((mode) == BootstrapProcessing || \
287 (mode) == InitProcessing || \
288 (mode) == NormalProcessing); \
292 #define GetProcessingMode() Mode
295 /*****************************************************************************
297 * POSTGRES initialization and cleanup definitions. *
298 *****************************************************************************/
300 /* in utils/init/postinit.c */
301 extern void InitPostgres(const char *dbname, const char *username);
302 extern void BaseInit(void);
304 /* in utils/init/miscinit.c */
305 extern void IgnoreSystemIndexes(bool mode);
306 extern bool IsIgnoringSystemIndexes(void);
307 extern void SetReindexProcessing(Oid heapOid, Oid indexOid);
308 extern bool ReindexIsProcessingHeap(Oid heapOid);
309 extern bool ReindexIsProcessingIndex(Oid indexOid);
310 extern void CreateDataDirLockFile(const char *datadir, bool amPostmaster);
311 extern void CreateSocketLockFile(const char *socketfile, bool amPostmaster);
312 extern void TouchSocketLockFile(void);
313 extern void RecordSharedMemoryInLockFile(unsigned long id1,
315 extern void ValidatePgVersion(const char *path);
316 extern void process_preload_libraries(char *preload_libraries_string);
318 #endif /* MISCADMIN_H */