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d13e903bea
reviewed by Neil Conway. This patch adds the following DDL command variants: RESET SESSION, RESET TEMP, RESET PLANS, CLOSE ALL, and DEALLOCATE ALL. RESET SESSION is intended for use by connection pool software and the like, in order to reset a client session to something close to its initial state. Note that while most of these command variants can be executed inside a transaction block (but are not transaction-aware!), RESET SESSION cannot. While this is inconsistent, it is intended to catch programmer mistakes: RESET SESSION in an open transaction block is probably unintended.
242 lines
8.4 KiB
C
242 lines
8.4 KiB
C
/*--------------------------------------------------------------------
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* guc.h
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*
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* External declarations pertaining to backend/utils/misc/guc.c and
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* backend/utils/misc/guc-file.l
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*
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* Copyright (c) 2000-2007, PostgreSQL Global Development Group
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* Written by Peter Eisentraut <peter_e@gmx.net>.
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*
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* $PostgreSQL: pgsql/src/include/utils/guc.h,v 1.81 2007/04/12 06:53:48 neilc Exp $
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*--------------------------------------------------------------------
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*/
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#ifndef GUC_H
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#define GUC_H
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#include "tcop/dest.h"
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#include "utils/array.h"
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/*
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* Certain options can only be set at certain times. The rules are
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* like this:
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*
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* INTERNAL options cannot be set by the user at all, but only through
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* internal processes ("server_version" is an example). These are GUC
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* variables only so they can be shown by SHOW, etc.
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*
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* POSTMASTER options can only be set when the postmaster starts,
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* either from the configuration file or the command line.
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*
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* SIGHUP options can only be set at postmaster startup or by changing
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* the configuration file and sending the HUP signal to the postmaster
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* or a backend process. (Notice that the signal receipt will not be
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* evaluated immediately. The postmaster and the backend check it at a
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* certain point in their main loop. It's safer to wait than to read a
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* file asynchronously.)
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*
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* BACKEND options can only be set at postmaster startup, from the
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* configuration file, or by client request in the connection startup
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* packet (e.g., from libpq's PGOPTIONS variable). Furthermore, an
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* already-started backend will ignore changes to such an option in the
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* configuration file. The idea is that these options are fixed for a
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* given backend once it's started, but they can vary across backends.
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*
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* SUSET options can be set at postmaster startup, with the SIGHUP
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* mechanism, or from SQL if you're a superuser.
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*
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* USERSET options can be set by anyone any time.
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*/
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typedef enum
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{
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PGC_INTERNAL,
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PGC_POSTMASTER,
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PGC_SIGHUP,
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PGC_BACKEND,
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PGC_SUSET,
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PGC_USERSET
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} GucContext;
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/*
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* The following type records the source of the current setting. A
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* new setting can only take effect if the previous setting had the
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* same or lower level. (E.g, changing the config file doesn't
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* override the postmaster command line.) Tracking the source allows us
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* to process sources in any convenient order without affecting results.
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* Sources <= PGC_S_OVERRIDE will set the default used by RESET, as well
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* as the current value. Note that source == PGC_S_OVERRIDE should be
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* used when setting a PGC_INTERNAL option.
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*
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* PGC_S_INTERACTIVE isn't actually a source value, but is the
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* dividing line between "interactive" and "non-interactive" sources for
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* error reporting purposes.
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*
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* PGC_S_TEST is used when testing values to be stored as per-database or
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* per-user defaults ("doit" will always be false, so this never gets stored
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* as the actual source of any value). This is an interactive case, but
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* it needs its own source value because some assign hooks need to make
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* different validity checks in this case.
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*/
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typedef enum
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{
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PGC_S_DEFAULT, /* wired-in default */
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PGC_S_ENV_VAR, /* postmaster environment variable */
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PGC_S_FILE, /* postgresql.conf */
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PGC_S_ARGV, /* postmaster command line */
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PGC_S_DATABASE, /* per-database setting */
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PGC_S_USER, /* per-user setting */
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PGC_S_CLIENT, /* from client connection request */
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PGC_S_OVERRIDE, /* special case to forcibly set default */
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PGC_S_INTERACTIVE, /* dividing line for error reporting */
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PGC_S_TEST, /* test per-database or per-user setting */
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PGC_S_SESSION /* SET command */
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} GucSource;
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typedef const char *(*GucStringAssignHook) (const char *newval, bool doit, GucSource source);
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typedef bool (*GucBoolAssignHook) (bool newval, bool doit, GucSource source);
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typedef bool (*GucIntAssignHook) (int newval, bool doit, GucSource source);
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typedef bool (*GucRealAssignHook) (double newval, bool doit, GucSource source);
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typedef const char *(*GucShowHook) (void);
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#define GUC_QUALIFIER_SEPARATOR '.'
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/* GUC vars that are actually declared in guc.c, rather than elsewhere */
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extern bool log_duration;
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extern bool Debug_print_plan;
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extern bool Debug_print_parse;
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extern bool Debug_print_rewritten;
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extern bool Debug_pretty_print;
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extern bool Explain_pretty_print;
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extern bool log_parser_stats;
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extern bool log_planner_stats;
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extern bool log_executor_stats;
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extern bool log_statement_stats;
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extern bool log_btree_build_stats;
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extern DLLIMPORT bool check_function_bodies;
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extern bool default_with_oids;
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extern bool SQL_inheritance;
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extern int log_min_error_statement;
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extern int log_min_messages;
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extern int client_min_messages;
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extern int log_min_duration_statement;
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extern int log_temp_files;
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extern int num_temp_buffers;
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extern char *ConfigFileName;
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extern char *HbaFileName;
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extern char *IdentFileName;
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extern char *external_pid_file;
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extern int tcp_keepalives_idle;
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extern int tcp_keepalives_interval;
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extern int tcp_keepalives_count;
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extern void SetConfigOption(const char *name, const char *value,
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GucContext context, GucSource source);
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extern void DefineCustomBoolVariable(
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const char *name,
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const char *short_desc,
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const char *long_desc,
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bool *valueAddr,
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GucContext context,
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GucBoolAssignHook assign_hook,
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GucShowHook show_hook);
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extern void DefineCustomIntVariable(
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const char *name,
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const char *short_desc,
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const char *long_desc,
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int *valueAddr,
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int minValue,
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int maxValue,
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GucContext context,
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GucIntAssignHook assign_hook,
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GucShowHook show_hook);
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extern void DefineCustomRealVariable(
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const char *name,
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const char *short_desc,
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const char *long_desc,
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double *valueAddr,
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double minValue,
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double maxValue,
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GucContext context,
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GucRealAssignHook assign_hook,
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GucShowHook show_hook);
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extern void DefineCustomStringVariable(
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const char *name,
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const char *short_desc,
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const char *long_desc,
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char **valueAddr,
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GucContext context,
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GucStringAssignHook assign_hook,
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GucShowHook show_hook);
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extern void EmitWarningsOnPlaceholders(const char *className);
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extern const char *GetConfigOption(const char *name);
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extern const char *GetConfigOptionResetString(const char *name);
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extern bool IsSuperuserConfigOption(const char *name);
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extern void ProcessConfigFile(GucContext context);
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extern void InitializeGUCOptions(void);
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extern bool SelectConfigFiles(const char *userDoption, const char *progname);
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extern void ResetAllOptions(void);
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extern void AtEOXact_GUC(bool isCommit, bool isSubXact);
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extern void BeginReportingGUCOptions(void);
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extern void ParseLongOption(const char *string, char **name, char **value);
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extern bool set_config_option(const char *name, const char *value,
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GucContext context, GucSource source,
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bool isLocal, bool changeVal);
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extern char *GetConfigOptionByName(const char *name, const char **varname);
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extern void GetConfigOptionByNum(int varnum, const char **values, bool *noshow);
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extern int GetNumConfigOptions(void);
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extern void SetPGVariable(const char *name, List *args, bool is_local);
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extern void GetPGVariable(const char *name, DestReceiver *dest);
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extern TupleDesc GetPGVariableResultDesc(const char *name);
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extern void ResetPGVariable(const char *name, bool isTopLevel);
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extern char *flatten_set_variable_args(const char *name, List *args);
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extern void ProcessGUCArray(ArrayType *array, GucSource source);
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extern ArrayType *GUCArrayAdd(ArrayType *array, const char *name, const char *value);
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extern ArrayType *GUCArrayDelete(ArrayType *array, const char *name);
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extern void pg_timezone_abbrev_initialize(void);
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#ifdef EXEC_BACKEND
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extern void write_nondefault_variables(GucContext context);
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extern void read_nondefault_variables(void);
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#endif
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/*
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* The following functions are not in guc.c, but are declared here to avoid
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* having to include guc.h in some widely used headers that it really doesn't
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* belong in.
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*/
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/* in commands/tablespace.c */
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extern const char *assign_default_tablespace(const char *newval,
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bool doit, GucSource source);
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/* in utils/adt/regexp.c */
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extern const char *assign_regex_flavor(const char *value,
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bool doit, GucSource source);
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/* in catalog/namespace.c */
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extern const char *assign_search_path(const char *newval,
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bool doit, GucSource source);
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/* in access/transam/xlog.c */
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extern const char *assign_xlog_sync_method(const char *method,
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bool doit, GucSource source);
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#endif /* GUC_H */
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