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 * $Id: miscadmin.h,v 1.135 2003/11/13 00:40:01 wieck 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 bool Noversion;
129 extern char *DataDir;
131 extern DLLIMPORT int MyProcPid;
132 extern struct Port *MyProcPort;
133 extern long MyCancelKey;
135 extern char OutputFileName[];
136 extern char pg_pathname[];
139 * done in storage/backendid.h for now.
141 * extern BackendId MyBackendId;
143 extern DLLIMPORT Oid MyDatabaseId;
146 * Date/Time Configuration
148 * DateStyle defines the output formatting choice for date/time types:
149 * USE_POSTGRES_DATES specifies traditional Postgres format
150 * USE_ISO_DATES specifies ISO-compliant format
151 * USE_SQL_DATES specifies Oracle/Ingres-compliant format
152 * USE_GERMAN_DATES specifies German-style dd.mm/yyyy
154 * DateOrder defines the field order to be assumed when reading an
155 * ambiguous date (anything not in YYYY-MM-DD format, with a four-digit
156 * year field first, is taken to be ambiguous):
157 * DATEORDER_YMD specifies field order yy-mm-dd
158 * DATEORDER_DMY specifies field order dd-mm-yy ("European" convention)
159 * DATEORDER_MDY specifies field order mm-dd-yy ("US" convention)
161 * In the Postgres and SQL DateStyles, DateOrder also selects output field
162 * order: day comes before month in DMY style, else month comes before day.
164 * The user-visible "DateStyle" run-time parameter subsumes both of these.
167 /* valid DateStyle values */
168 #define USE_POSTGRES_DATES 0
169 #define USE_ISO_DATES 1
170 #define USE_SQL_DATES 2
171 #define USE_GERMAN_DATES 3
173 /* valid DateOrder values */
174 #define DATEORDER_YMD 0
175 #define DATEORDER_DMY 1
176 #define DATEORDER_MDY 2
178 extern int DateStyle;
179 extern int DateOrder;
182 * HasCTZSet is true if user has set timezone as a numeric offset from UTC.
183 * If so, CTimeZone is the timezone offset in seconds (using the Unix-ish
184 * sign convention, ie, positive offset is west of UTC, rather than the
185 * SQL-ish convention that positive is east of UTC).
187 extern bool HasCTZSet;
188 extern int CTimeZone;
190 #define MAXTZLEN 10 /* max TZ name len, not counting tr. null */
192 extern bool enableFsync;
193 extern bool allowSystemTableMods;
194 extern DLLIMPORT int SortMem;
195 extern int VacuumMem;
198 * A few postmaster startup options are exported here so the
199 * configuration file processor can access them.
201 extern bool NetServer;
202 extern bool EnableSSL;
203 extern bool SilentMode;
204 extern int MaxBackends;
205 extern int ReservedBackends;
206 extern DLLIMPORT int NBuffers;
207 extern int PostPortNumber;
208 extern int Unix_socket_permissions;
209 extern char *Unix_socket_group;
210 extern char *UnixSocketDir;
211 extern char *VirtualHost;
214 /*****************************************************************************
216 * POSTGRES directory path definitions. *
217 *****************************************************************************/
219 extern char *DatabasePath;
221 /* in utils/misc/database.c */
222 extern void GetRawDatabaseInfo(const char *name, Oid *db_id, char *path);
223 extern char *ExpandDatabasePath(const char *path);
225 /* now in utils/init/miscinit.c */
226 extern void SetDatabasePath(const char *path);
228 extern char *GetUserNameFromId(AclId userid);
229 extern AclId GetUserId(void);
230 extern void SetUserId(AclId userid);
231 extern AclId GetSessionUserId(void);
232 extern void SetSessionUserId(AclId userid);
233 extern void InitializeSessionUserId(const char *username);
234 extern void InitializeSessionUserIdStandalone(void);
235 extern void SetSessionAuthorization(AclId userid, bool is_superuser);
237 extern void SetDataDir(const char *dir);
239 extern int FindExec(char *full_path, const char *argv0,
240 const char *binary_name);
241 extern int CheckPathAccess(char *path, char *name, int open_mode);
243 /* in utils/misc/superuser.c */
244 extern bool superuser(void); /* current user is superuser */
245 extern bool superuser_arg(AclId userid); /* given user is superuser */
248 /*****************************************************************************
250 * POSTGRES processing mode definitions. *
251 *****************************************************************************/
255 * There are three processing modes in POSTGRES. They are
256 * BootstrapProcessing or "bootstrap," InitProcessing or
257 * "initialization," and NormalProcessing or "normal."
259 * The first two processing modes are used during special times. When the
260 * system state indicates bootstrap processing, transactions are all given
261 * transaction id "one" and are consequently guaranteed to commit. This mode
262 * is used during the initial generation of template databases.
264 * Initialization mode: used while starting a backend, until all normal
265 * initialization is complete. Some code behaves differently when executed
266 * in this mode to enable system bootstrapping.
268 * If a POSTGRES binary is in normal mode, then all code may be executed
272 typedef enum ProcessingMode
274 BootstrapProcessing, /* bootstrap creation of template database */
275 InitProcessing, /* initializing system */
276 NormalProcessing /* normal processing */
279 extern ProcessingMode Mode;
281 #define IsBootstrapProcessingMode() ((bool)(Mode == BootstrapProcessing))
282 #define IsInitProcessingMode() ((bool)(Mode == InitProcessing))
283 #define IsNormalProcessingMode() ((bool)(Mode == NormalProcessing))
285 #define SetProcessingMode(mode) \
287 AssertArg((mode) == BootstrapProcessing || \
288 (mode) == InitProcessing || \
289 (mode) == NormalProcessing); \
293 #define GetProcessingMode() Mode
296 /*****************************************************************************
298 * POSTGRES initialization and cleanup definitions. *
299 *****************************************************************************/
301 /* in utils/init/postinit.c */
302 extern void InitPostgres(const char *dbname, const char *username);
303 extern void BaseInit(void);
305 /* in utils/init/miscinit.c */
306 extern void IgnoreSystemIndexes(bool mode);
307 extern bool IsIgnoringSystemIndexes(void);
308 extern void SetReindexProcessing(Oid heapOid, Oid indexOid);
309 extern bool ReindexIsProcessingHeap(Oid heapOid);
310 extern bool ReindexIsProcessingIndex(Oid indexOid);
311 extern void CreateDataDirLockFile(const char *datadir, bool amPostmaster);
312 extern void CreateSocketLockFile(const char *socketfile, bool amPostmaster);
313 extern void TouchSocketLockFile(void);
314 extern void RecordSharedMemoryInLockFile(unsigned long id1,
316 extern void ValidatePgVersion(const char *path);
317 extern void process_preload_libraries(char *preload_libraries_string);
319 #endif /* MISCADMIN_H */