Adding upstream version 15.5.upstream/15.5

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 495 insertions, 0 deletions

diff --git a/src/include/miscadmin.h b/src/include/miscadmin.h
new file mode 100644
index 0000000..3233278
--- /dev/null
+++ b/src/include/miscadmin.h
@@ -0,0 +1,495 @@
+/*-------------------------------------------------------------------------
+ *
+ * miscadmin.h
+ *	  This file contains general postgres administration and initialization
+ *	  stuff that used to be spread out between the following files:
+ *		globals.h						global variables
+ *		pdir.h							directory path crud
+ *		pinit.h							postgres initialization
+ *		pmod.h							processing modes
+ *	  Over time, this has also become the preferred place for widely known
+ *	  resource-limitation stuff, such as work_mem and check_stack_depth().
+ *
+ * Portions Copyright (c) 1996-2022, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/miscadmin.h
+ *
+ * NOTES
+ *	  some of the information in this file should be moved to other files.
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef MISCADMIN_H
+#define MISCADMIN_H
+
+#include <signal.h>
+
+#include "datatype/timestamp.h" /* for TimestampTz */
+#include "pgtime.h"				/* for pg_time_t */
+
+
+#define InvalidPid				(-1)
+
+
+/*****************************************************************************
+ *	  System interrupt and critical section handling
+ *
+ * There are two types of interrupts that a running backend needs to accept
+ * without messing up its state: QueryCancel (SIGINT) and ProcDie (SIGTERM).
+ * In both cases, we need to be able to clean up the current transaction
+ * gracefully, so we can't respond to the interrupt instantaneously ---
+ * there's no guarantee that internal data structures would be self-consistent
+ * if the code is interrupted at an arbitrary instant.  Instead, the signal
+ * handlers set flags that are checked periodically during execution.
+ *
+ * The CHECK_FOR_INTERRUPTS() macro is called at strategically located spots
+ * where it is normally safe to accept a cancel or die interrupt.  In some
+ * cases, we invoke CHECK_FOR_INTERRUPTS() inside low-level subroutines that
+ * might sometimes be called in contexts that do *not* want to allow a cancel
+ * or die interrupt.  The HOLD_INTERRUPTS() and RESUME_INTERRUPTS() macros
+ * allow code to ensure that no cancel or die interrupt will be accepted,
+ * even if CHECK_FOR_INTERRUPTS() gets called in a subroutine.  The interrupt
+ * will be held off until CHECK_FOR_INTERRUPTS() is done outside any
+ * HOLD_INTERRUPTS() ... RESUME_INTERRUPTS() section.
+ *
+ * There is also a mechanism to prevent query cancel interrupts, while still
+ * allowing die interrupts: HOLD_CANCEL_INTERRUPTS() and
+ * RESUME_CANCEL_INTERRUPTS().
+ *
+ * Note that ProcessInterrupts() has also acquired a number of tasks that
+ * do not necessarily cause a query-cancel-or-die response.  Hence, it's
+ * possible that it will just clear InterruptPending and return.
+ *
+ * INTERRUPTS_PENDING_CONDITION() can be checked to see whether an
+ * interrupt needs to be serviced, without trying to do so immediately.
+ * Some callers are also interested in INTERRUPTS_CAN_BE_PROCESSED(),
+ * which tells whether ProcessInterrupts is sure to clear the interrupt.
+ *
+ * Special mechanisms are used to let an interrupt be accepted when we are
+ * waiting for a lock or when we are waiting for command input (but, of
+ * course, only if the interrupt holdoff counter is zero).  See the
+ * related code for details.
+ *
+ * A lost connection is handled similarly, although the loss of connection
+ * does not raise a signal, but is detected when we fail to write to the
+ * socket. If there was a signal for a broken connection, we could make use of
+ * it by setting ClientConnectionLost in the signal handler.
+ *
+ * A related, but conceptually distinct, mechanism is the "critical section"
+ * mechanism.  A critical section not only holds off cancel/die interrupts,
+ * but causes any ereport(ERROR) or ereport(FATAL) to become ereport(PANIC)
+ * --- that is, a system-wide reset is forced.  Needless to say, only really
+ * *critical* code should be marked as a critical section!	Currently, this
+ * mechanism is only used for XLOG-related code.
+ *
+ *****************************************************************************/
+
+/* in globals.c */
+/* these are marked volatile because they are set by signal handlers: */
+extern PGDLLIMPORT volatile sig_atomic_t InterruptPending;
+extern PGDLLIMPORT volatile sig_atomic_t QueryCancelPending;
+extern PGDLLIMPORT volatile sig_atomic_t ProcDiePending;
+extern PGDLLIMPORT volatile sig_atomic_t IdleInTransactionSessionTimeoutPending;
+extern PGDLLIMPORT volatile sig_atomic_t IdleSessionTimeoutPending;
+extern PGDLLIMPORT volatile sig_atomic_t ProcSignalBarrierPending;
+extern PGDLLIMPORT volatile sig_atomic_t LogMemoryContextPending;
+extern PGDLLIMPORT volatile sig_atomic_t IdleStatsUpdateTimeoutPending;
+
+extern PGDLLIMPORT volatile sig_atomic_t CheckClientConnectionPending;
+extern PGDLLIMPORT volatile sig_atomic_t ClientConnectionLost;
+
+/* these are marked volatile because they are examined by signal handlers: */
+extern PGDLLIMPORT volatile uint32 InterruptHoldoffCount;
+extern PGDLLIMPORT volatile uint32 QueryCancelHoldoffCount;
+extern PGDLLIMPORT volatile uint32 CritSectionCount;
+
+/* in tcop/postgres.c */
+extern void ProcessInterrupts(void);
+
+/* Test whether an interrupt is pending */
+#ifndef WIN32
+#define INTERRUPTS_PENDING_CONDITION() \
+	(unlikely(InterruptPending))
+#else
+#define INTERRUPTS_PENDING_CONDITION() \
+	(unlikely(UNBLOCKED_SIGNAL_QUEUE()) ? pgwin32_dispatch_queued_signals() : 0, \
+	 unlikely(InterruptPending))
+#endif
+
+/* Service interrupt, if one is pending and it's safe to service it now */
+#define CHECK_FOR_INTERRUPTS() \
+do { \
+	if (INTERRUPTS_PENDING_CONDITION()) \
+		ProcessInterrupts(); \
+} while(0)
+
+/* Is ProcessInterrupts() guaranteed to clear InterruptPending? */
+#define INTERRUPTS_CAN_BE_PROCESSED() \
+	(InterruptHoldoffCount == 0 && CritSectionCount == 0 && \
+	 QueryCancelHoldoffCount == 0)
+
+#define HOLD_INTERRUPTS()  (InterruptHoldoffCount++)
+
+#define RESUME_INTERRUPTS() \
+do { \
+	Assert(InterruptHoldoffCount > 0); \
+	InterruptHoldoffCount--; \
+} while(0)
+
+#define HOLD_CANCEL_INTERRUPTS()  (QueryCancelHoldoffCount++)
+
+#define RESUME_CANCEL_INTERRUPTS() \
+do { \
+	Assert(QueryCancelHoldoffCount > 0); \
+	QueryCancelHoldoffCount--; \
+} while(0)
+
+#define START_CRIT_SECTION()  (CritSectionCount++)
+
+#define END_CRIT_SECTION() \
+do { \
+	Assert(CritSectionCount > 0); \
+	CritSectionCount--; \
+} while(0)
+
+
+/*****************************************************************************
+ *	  globals.h --															 *
+ *****************************************************************************/
+
+/*
+ * from utils/init/globals.c
+ */
+extern PGDLLIMPORT pid_t PostmasterPid;
+extern PGDLLIMPORT bool IsPostmasterEnvironment;
+extern PGDLLIMPORT bool IsUnderPostmaster;
+extern PGDLLIMPORT bool IsBackgroundWorker;
+extern PGDLLIMPORT bool IsBinaryUpgrade;
+
+extern PGDLLIMPORT bool ExitOnAnyError;
+
+extern PGDLLIMPORT char *DataDir;
+extern PGDLLIMPORT int data_directory_mode;
+
+extern PGDLLIMPORT int NBuffers;
+extern PGDLLIMPORT int MaxBackends;
+extern PGDLLIMPORT int MaxConnections;
+extern PGDLLIMPORT int max_worker_processes;
+extern PGDLLIMPORT int max_parallel_workers;
+
+extern PGDLLIMPORT int MyProcPid;
+extern PGDLLIMPORT pg_time_t MyStartTime;
+extern PGDLLIMPORT TimestampTz MyStartTimestamp;
+extern PGDLLIMPORT struct Port *MyProcPort;
+extern PGDLLIMPORT struct Latch *MyLatch;
+extern PGDLLIMPORT int32 MyCancelKey;
+extern PGDLLIMPORT int MyPMChildSlot;
+
+extern PGDLLIMPORT char OutputFileName[];
+extern PGDLLIMPORT char my_exec_path[];
+extern PGDLLIMPORT char pkglib_path[];
+
+#ifdef EXEC_BACKEND
+extern PGDLLIMPORT char postgres_exec_path[];
+#endif
+
+/*
+ * done in storage/backendid.h for now.
+ *
+ * extern BackendId    MyBackendId;
+ */
+extern PGDLLIMPORT Oid MyDatabaseId;
+
+extern PGDLLIMPORT Oid MyDatabaseTableSpace;
+
+/*
+ * Date/Time Configuration
+ *
+ * DateStyle defines the output formatting choice for date/time types:
+ *	USE_POSTGRES_DATES specifies traditional Postgres format
+ *	USE_ISO_DATES specifies ISO-compliant format
+ *	USE_SQL_DATES specifies Oracle/Ingres-compliant format
+ *	USE_GERMAN_DATES specifies German-style dd.mm/yyyy
+ *
+ * DateOrder defines the field order to be assumed when reading an
+ * ambiguous date (anything not in YYYY-MM-DD format, with a four-digit
+ * year field first, is taken to be ambiguous):
+ *	DATEORDER_YMD specifies field order yy-mm-dd
+ *	DATEORDER_DMY specifies field order dd-mm-yy ("European" convention)
+ *	DATEORDER_MDY specifies field order mm-dd-yy ("US" convention)
+ *
+ * In the Postgres and SQL DateStyles, DateOrder also selects output field
+ * order: day comes before month in DMY style, else month comes before day.
+ *
+ * The user-visible "DateStyle" run-time parameter subsumes both of these.
+ */
+
+/* valid DateStyle values */
+#define USE_POSTGRES_DATES		0
+#define USE_ISO_DATES			1
+#define USE_SQL_DATES			2
+#define USE_GERMAN_DATES		3
+#define USE_XSD_DATES			4
+
+/* valid DateOrder values */
+#define DATEORDER_YMD			0
+#define DATEORDER_DMY			1
+#define DATEORDER_MDY			2
+
+extern PGDLLIMPORT int DateStyle;
+extern PGDLLIMPORT int DateOrder;
+
+/*
+ * IntervalStyles
+ *	 INTSTYLE_POSTGRES			   Like Postgres < 8.4 when DateStyle = 'iso'
+ *	 INTSTYLE_POSTGRES_VERBOSE	   Like Postgres < 8.4 when DateStyle != 'iso'
+ *	 INTSTYLE_SQL_STANDARD		   SQL standard interval literals
+ *	 INTSTYLE_ISO_8601			   ISO-8601-basic formatted intervals
+ */
+#define INTSTYLE_POSTGRES			0
+#define INTSTYLE_POSTGRES_VERBOSE	1
+#define INTSTYLE_SQL_STANDARD		2
+#define INTSTYLE_ISO_8601			3
+
+extern PGDLLIMPORT int IntervalStyle;
+
+#define MAXTZLEN		10		/* max TZ name len, not counting tr. null */
+
+extern PGDLLIMPORT bool enableFsync;
+extern PGDLLIMPORT bool allowSystemTableMods;
+extern PGDLLIMPORT int work_mem;
+extern PGDLLIMPORT double hash_mem_multiplier;
+extern PGDLLIMPORT int maintenance_work_mem;
+extern PGDLLIMPORT int max_parallel_maintenance_workers;
+
+extern PGDLLIMPORT int VacuumCostPageHit;
+extern PGDLLIMPORT int VacuumCostPageMiss;
+extern PGDLLIMPORT int VacuumCostPageDirty;
+extern PGDLLIMPORT int VacuumCostLimit;
+extern PGDLLIMPORT double VacuumCostDelay;
+
+extern PGDLLIMPORT int64 VacuumPageHit;
+extern PGDLLIMPORT int64 VacuumPageMiss;
+extern PGDLLIMPORT int64 VacuumPageDirty;
+
+extern PGDLLIMPORT int VacuumCostBalance;
+extern PGDLLIMPORT bool VacuumCostActive;
+
+
+/* in tcop/postgres.c */
+
+#if defined(__ia64__) || defined(__ia64)
+typedef struct
+{
+	char	   *stack_base_ptr;
+	char	   *register_stack_base_ptr;
+} pg_stack_base_t;
+#else
+typedef char *pg_stack_base_t;
+#endif
+
+extern pg_stack_base_t set_stack_base(void);
+extern void restore_stack_base(pg_stack_base_t base);
+extern void check_stack_depth(void);
+extern bool stack_is_too_deep(void);
+
+/* in tcop/utility.c */
+extern void PreventCommandIfReadOnly(const char *cmdname);
+extern void PreventCommandIfParallelMode(const char *cmdname);
+extern void PreventCommandDuringRecovery(const char *cmdname);
+
+/* in utils/misc/guc.c */
+extern PGDLLIMPORT int trace_recovery_messages;
+extern int	trace_recovery(int trace_level);
+
+/*****************************************************************************
+ *	  pdir.h --																 *
+ *			POSTGRES directory path definitions.                             *
+ *****************************************************************************/
+
+/* flags to be OR'd to form sec_context */
+#define SECURITY_LOCAL_USERID_CHANGE	0x0001
+#define SECURITY_RESTRICTED_OPERATION	0x0002
+#define SECURITY_NOFORCE_RLS			0x0004
+
+extern PGDLLIMPORT char *DatabasePath;
+
+/* now in utils/init/miscinit.c */
+extern void InitPostmasterChild(void);
+extern void InitStandaloneProcess(const char *argv0);
+extern void SwitchToSharedLatch(void);
+extern void SwitchBackToLocalLatch(void);
+
+typedef enum BackendType
+{
+	B_INVALID = 0,
+	B_AUTOVAC_LAUNCHER,
+	B_AUTOVAC_WORKER,
+	B_BACKEND,
+	B_BG_WORKER,
+	B_BG_WRITER,
+	B_CHECKPOINTER,
+	B_STARTUP,
+	B_WAL_RECEIVER,
+	B_WAL_SENDER,
+	B_WAL_WRITER,
+	B_ARCHIVER,
+	B_LOGGER,
+} BackendType;
+
+extern PGDLLIMPORT BackendType MyBackendType;
+
+extern const char *GetBackendTypeDesc(BackendType backendType);
+
+extern void SetDatabasePath(const char *path);
+extern void checkDataDir(void);
+extern void SetDataDir(const char *dir);
+extern void ChangeToDataDir(void);
+
+extern char *GetUserNameFromId(Oid roleid, bool noerr);
+extern Oid	GetUserId(void);
+extern Oid	GetOuterUserId(void);
+extern Oid	GetSessionUserId(void);
+extern Oid	GetAuthenticatedUserId(void);
+extern void GetUserIdAndSecContext(Oid *userid, int *sec_context);
+extern void SetUserIdAndSecContext(Oid userid, int sec_context);
+extern bool InLocalUserIdChange(void);
+extern bool InSecurityRestrictedOperation(void);
+extern bool InNoForceRLSOperation(void);
+extern void GetUserIdAndContext(Oid *userid, bool *sec_def_context);
+extern void SetUserIdAndContext(Oid userid, bool sec_def_context);
+extern void InitializeSessionUserId(const char *rolename, Oid useroid);
+extern void InitializeSessionUserIdStandalone(void);
+extern void SetSessionAuthorization(Oid userid, bool is_superuser);
+extern Oid	GetCurrentRoleId(void);
+extern void SetCurrentRoleId(Oid roleid, bool is_superuser);
+
+/* in utils/misc/superuser.c */
+extern bool superuser(void);	/* current user is superuser */
+extern bool superuser_arg(Oid roleid);	/* given user is superuser */
+
+
+/*****************************************************************************
+ *	  pmod.h --																 *
+ *			POSTGRES processing mode definitions.                            *
+ *****************************************************************************/
+
+/*
+ * Description:
+ *		There are three processing modes in POSTGRES.  They are
+ * BootstrapProcessing or "bootstrap," InitProcessing or
+ * "initialization," and NormalProcessing or "normal."
+ *
+ * The first two processing modes are used during special times. When the
+ * system state indicates bootstrap processing, transactions are all given
+ * transaction id "one" and are consequently guaranteed to commit. This mode
+ * is used during the initial generation of template databases.
+ *
+ * Initialization mode: used while starting a backend, until all normal
+ * initialization is complete.  Some code behaves differently when executed
+ * in this mode to enable system bootstrapping.
+ *
+ * If a POSTGRES backend process is in normal mode, then all code may be
+ * executed normally.
+ */
+
+typedef enum ProcessingMode
+{
+	BootstrapProcessing,		/* bootstrap creation of template database */
+	InitProcessing,				/* initializing system */
+	NormalProcessing			/* normal processing */
+} ProcessingMode;
+
+extern PGDLLIMPORT ProcessingMode Mode;
+
+#define IsBootstrapProcessingMode() (Mode == BootstrapProcessing)
+#define IsInitProcessingMode()		(Mode == InitProcessing)
+#define IsNormalProcessingMode()	(Mode == NormalProcessing)
+
+#define GetProcessingMode() Mode
+
+#define SetProcessingMode(mode) \
+	do { \
+		AssertArg((mode) == BootstrapProcessing || \
+				  (mode) == InitProcessing || \
+				  (mode) == NormalProcessing); \
+		Mode = (mode); \
+	} while(0)
+
+
+/*
+ * Auxiliary-process type identifiers.  These used to be in bootstrap.h
+ * but it seems saner to have them here, with the ProcessingMode stuff.
+ * The MyAuxProcType global is defined and set in auxprocess.c.
+ *
+ * Make sure to list in the glossary any items you add here.
+ */
+
+typedef enum
+{
+	NotAnAuxProcess = -1,
+	StartupProcess = 0,
+	BgWriterProcess,
+	ArchiverProcess,
+	CheckpointerProcess,
+	WalWriterProcess,
+	WalReceiverProcess,
+
+	NUM_AUXPROCTYPES			/* Must be last! */
+} AuxProcType;
+
+extern PGDLLIMPORT AuxProcType MyAuxProcType;
+
+#define AmStartupProcess()			(MyAuxProcType == StartupProcess)
+#define AmBackgroundWriterProcess() (MyAuxProcType == BgWriterProcess)
+#define AmArchiverProcess()			(MyAuxProcType == ArchiverProcess)
+#define AmCheckpointerProcess()		(MyAuxProcType == CheckpointerProcess)
+#define AmWalWriterProcess()		(MyAuxProcType == WalWriterProcess)
+#define AmWalReceiverProcess()		(MyAuxProcType == WalReceiverProcess)
+
+
+/*****************************************************************************
+ *	  pinit.h --															 *
+ *			POSTGRES initialization and cleanup definitions.                 *
+ *****************************************************************************/
+
+/* in utils/init/postinit.c */
+extern void pg_split_opts(char **argv, int *argcp, const char *optstr);
+extern void InitializeMaxBackends(void);
+extern void InitPostgres(const char *in_dbname, Oid dboid,
+						 const char *username, Oid useroid,
+						 bool load_session_libraries,
+						 bool override_allow_connections,
+						 char *out_dbname);
+extern void BaseInit(void);
+
+/* in utils/init/miscinit.c */
+extern PGDLLIMPORT bool IgnoreSystemIndexes;
+extern PGDLLIMPORT bool process_shared_preload_libraries_in_progress;
+extern PGDLLIMPORT bool process_shared_preload_libraries_done;
+extern PGDLLIMPORT bool process_shmem_requests_in_progress;
+extern PGDLLIMPORT char *session_preload_libraries_string;
+extern PGDLLIMPORT char *shared_preload_libraries_string;
+extern PGDLLIMPORT char *local_preload_libraries_string;
+
+extern void CreateDataDirLockFile(bool amPostmaster);
+extern void CreateSocketLockFile(const char *socketfile, bool amPostmaster,
+								 const char *socketDir);
+extern void TouchSocketLockFiles(void);
+extern void AddToDataDirLockFile(int target_line, const char *str);
+extern bool RecheckDataDirLockFile(void);
+extern void ValidatePgVersion(const char *path);
+extern void process_shared_preload_libraries(void);
+extern void process_session_preload_libraries(void);
+extern void process_shmem_requests(void);
+extern void pg_bindtextdomain(const char *domain);
+extern bool has_rolreplication(Oid roleid);
+
+typedef void (*shmem_request_hook_type) (void);
+extern PGDLLIMPORT shmem_request_hook_type shmem_request_hook;
+
+/* in executor/nodeHash.c */
+extern size_t get_hash_memory_limit(void);
+
+#endif							/* MISCADMIN_H */