445 lines
16 KiB
C
445 lines
16 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) 2000-2020, PostgreSQL Global Development Group
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* Written by Peter Eisentraut <peter_e@gmx.net>.
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*
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* src/include/utils/guc.h
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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 "nodes/parsenodes.h"
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#include "tcop/dest.h"
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#include "utils/array.h"
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/* upper limit for GUC variables measured in kilobytes of memory */
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/* note that various places assume the byte size fits in a "long" variable */
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#if SIZEOF_SIZE_T > 4 && SIZEOF_LONG > 4
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#define MAX_KILOBYTES INT_MAX
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#else
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#define MAX_KILOBYTES (INT_MAX / 1024)
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#endif
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/*
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* Automatic configuration file name for ALTER SYSTEM.
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* This file will be used to store values of configuration parameters
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* set by ALTER SYSTEM command.
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*/
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#define PG_AUTOCONF_FILENAME "postgresql.auto.conf"
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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 and SU_BACKEND options can only be set at postmaster startup,
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* from the configuration file, or by client request in the connection
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* startup packet (e.g., from libpq's PGOPTIONS variable). SU_BACKEND
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* options can be set from the startup packet only when the user is a
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* superuser. Furthermore, an already-started backend will ignore changes
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* to such an option in the configuration file. The idea is that these
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* options are fixed for a given backend once it's started, but they can
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* 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 the startup packet or 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_SU_BACKEND,
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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 used later ("doit" will always
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* be false, so this never gets stored as the actual source of any value).
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* For example, ALTER DATABASE/ROLE tests proposed per-database or per-user
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* defaults this way, and CREATE FUNCTION tests proposed function SET clauses
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* this way. This is an interactive case, but it needs its own source value
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* because some assign hooks need to make different validity checks in this
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* case. In particular, references to nonexistent database objects generally
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* shouldn't throw hard errors in this case, at most NOTICEs, since the
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* objects might exist by the time the setting is used for real.
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*
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* NB: see GucSource_Names in guc.c if you change this.
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*/
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typedef enum
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{
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PGC_S_DEFAULT, /* hard-wired default ("boot_val") */
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PGC_S_DYNAMIC_DEFAULT, /* default computed during initialization */
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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_GLOBAL, /* global in-database setting */
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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_DATABASE_USER, /* per-user-and-database 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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/*
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* Parsing the configuration file(s) will return a list of name-value pairs
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* with source location info. We also abuse this data structure to carry
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* error reports about the config files. An entry reporting an error will
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* have errmsg != NULL, and might have NULLs for name, value, and/or filename.
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*
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* If "ignore" is true, don't attempt to apply the item (it might be an error
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* report, or an item we determined to be duplicate). "applied" is set true
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* if we successfully applied, or could have applied, the setting.
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*/
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typedef struct ConfigVariable
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{
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char *name;
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char *value;
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char *errmsg;
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char *filename;
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int sourceline;
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bool ignore;
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bool applied;
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struct ConfigVariable *next;
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} ConfigVariable;
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extern bool ParseConfigFile(const char *config_file, bool strict,
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const char *calling_file, int calling_lineno,
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int depth, int elevel,
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ConfigVariable **head_p, ConfigVariable **tail_p);
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extern bool ParseConfigFp(FILE *fp, const char *config_file,
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int depth, int elevel,
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ConfigVariable **head_p, ConfigVariable **tail_p);
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extern bool ParseConfigDirectory(const char *includedir,
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const char *calling_file, int calling_lineno,
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int depth, int elevel,
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ConfigVariable **head_p,
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ConfigVariable **tail_p);
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extern void FreeConfigVariables(ConfigVariable *list);
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extern char *DeescapeQuotedString(const char *s);
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/*
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* The possible values of an enum variable are specified by an array of
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* name-value pairs. The "hidden" flag means the value is accepted but
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* won't be displayed when guc.c is asked for a list of acceptable values.
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*/
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struct config_enum_entry
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{
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const char *name;
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int val;
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bool hidden;
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};
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/*
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* Signatures for per-variable check/assign/show hook functions
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*/
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typedef bool (*GucBoolCheckHook) (bool *newval, void **extra, GucSource source);
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typedef bool (*GucIntCheckHook) (int *newval, void **extra, GucSource source);
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typedef bool (*GucRealCheckHook) (double *newval, void **extra, GucSource source);
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typedef bool (*GucStringCheckHook) (char **newval, void **extra, GucSource source);
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typedef bool (*GucEnumCheckHook) (int *newval, void **extra, GucSource source);
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typedef void (*GucBoolAssignHook) (bool newval, void *extra);
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typedef void (*GucIntAssignHook) (int newval, void *extra);
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typedef void (*GucRealAssignHook) (double newval, void *extra);
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typedef void (*GucStringAssignHook) (const char *newval, void *extra);
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typedef void (*GucEnumAssignHook) (int newval, void *extra);
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typedef const char *(*GucShowHook) (void);
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/*
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* Miscellaneous
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*/
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typedef enum
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{
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/* Types of set_config_option actions */
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GUC_ACTION_SET, /* regular SET command */
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GUC_ACTION_LOCAL, /* SET LOCAL command */
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GUC_ACTION_SAVE /* function SET option, or temp assignment */
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} GucAction;
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#define GUC_QUALIFIER_SEPARATOR '.'
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/*
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* bit values in "flags" of a GUC variable
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*/
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#define GUC_LIST_INPUT 0x0001 /* input can be list format */
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#define GUC_LIST_QUOTE 0x0002 /* double-quote list elements */
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#define GUC_NO_SHOW_ALL 0x0004 /* exclude from SHOW ALL */
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#define GUC_NO_RESET_ALL 0x0008 /* exclude from RESET ALL */
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#define GUC_REPORT 0x0010 /* auto-report changes to client */
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#define GUC_NOT_IN_SAMPLE 0x0020 /* not in postgresql.conf.sample */
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#define GUC_DISALLOW_IN_FILE 0x0040 /* can't set in postgresql.conf */
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#define GUC_CUSTOM_PLACEHOLDER 0x0080 /* placeholder for custom variable */
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#define GUC_SUPERUSER_ONLY 0x0100 /* show only to superusers */
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#define GUC_IS_NAME 0x0200 /* limit string to NAMEDATALEN-1 */
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#define GUC_NOT_WHILE_SEC_REST 0x0400 /* can't set if security restricted */
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#define GUC_DISALLOW_IN_AUTO_FILE 0x0800 /* can't set in
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* PG_AUTOCONF_FILENAME */
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#define GUC_UNIT_KB 0x1000 /* value is in kilobytes */
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#define GUC_UNIT_BLOCKS 0x2000 /* value is in blocks */
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#define GUC_UNIT_XBLOCKS 0x3000 /* value is in xlog blocks */
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#define GUC_UNIT_MB 0x4000 /* value is in megabytes */
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#define GUC_UNIT_BYTE 0x8000 /* value is in bytes */
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#define GUC_UNIT_MEMORY 0xF000 /* mask for size-related units */
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#define GUC_UNIT_MS 0x10000 /* value is in milliseconds */
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#define GUC_UNIT_S 0x20000 /* value is in seconds */
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#define GUC_UNIT_MIN 0x30000 /* value is in minutes */
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#define GUC_UNIT_TIME 0xF0000 /* mask for time-related units */
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#define GUC_EXPLAIN 0x100000 /* include in explain */
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#define GUC_UNIT (GUC_UNIT_MEMORY | GUC_UNIT_TIME)
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/* GUC vars that are actually declared in guc.c, rather than elsewhere */
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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 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 PGDLLIMPORT bool check_function_bodies;
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extern bool session_auth_is_superuser;
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extern bool log_duration;
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extern int log_parameter_max_length;
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extern int log_parameter_max_length_on_error;
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extern int log_min_error_statement;
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extern PGDLLIMPORT int log_min_messages;
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extern PGDLLIMPORT int client_min_messages;
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extern int log_min_duration_sample;
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extern int log_min_duration_statement;
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extern int log_temp_files;
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extern double log_statement_sample_rate;
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extern double log_xact_sample_rate;
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extern char *backtrace_functions;
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extern char *backtrace_symbol_list;
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extern int temp_file_limit;
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extern int num_temp_buffers;
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extern char *cluster_name;
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extern PGDLLIMPORT 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 PGDLLIMPORT char *application_name;
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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 int tcp_user_timeout;
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#ifdef TRACE_SORT
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extern bool trace_sort;
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#endif
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/*
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* Functions exported by guc.c
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*/
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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(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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bool bootValue,
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GucContext context,
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int flags,
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GucBoolCheckHook check_hook,
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GucBoolAssignHook assign_hook,
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GucShowHook show_hook);
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extern void DefineCustomIntVariable(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 bootValue,
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int minValue,
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int maxValue,
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GucContext context,
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int flags,
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GucIntCheckHook check_hook,
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GucIntAssignHook assign_hook,
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GucShowHook show_hook);
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extern void DefineCustomRealVariable(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 bootValue,
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double minValue,
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double maxValue,
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GucContext context,
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int flags,
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GucRealCheckHook check_hook,
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GucRealAssignHook assign_hook,
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GucShowHook show_hook);
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extern void DefineCustomStringVariable(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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const char *bootValue,
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GucContext context,
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int flags,
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GucStringCheckHook check_hook,
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GucStringAssignHook assign_hook,
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GucShowHook show_hook);
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extern void DefineCustomEnumVariable(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 bootValue,
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const struct config_enum_entry *options,
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GucContext context,
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int flags,
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GucEnumCheckHook check_hook,
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GucEnumAssignHook 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, bool missing_ok,
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bool restrict_privileged);
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extern const char *GetConfigOptionResetString(const char *name);
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extern int GetConfigOptionFlags(const char *name, bool missing_ok);
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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 AtStart_GUC(void);
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extern int NewGUCNestLevel(void);
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extern void AtEOXact_GUC(bool isCommit, int nestLevel);
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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 parse_int(const char *value, int *result, int flags,
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const char **hintmsg);
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extern bool parse_real(const char *value, double *result, int flags,
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const char **hintmsg);
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extern int set_config_option(const char *name, const char *value,
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GucContext context, GucSource source,
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GucAction action, bool changeVal, int elevel,
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bool is_reload);
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extern void AlterSystemSetConfigFile(AlterSystemStmt *altersysstmt);
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extern char *GetConfigOptionByName(const char *name, const char **varname,
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bool missing_ok);
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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 ExecSetVariableStmt(VariableSetStmt *stmt, bool isTopLevel);
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extern char *ExtractSetVariableArgs(VariableSetStmt *stmt);
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extern void ProcessGUCArray(ArrayType *array,
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GucContext context, GucSource source, GucAction action);
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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 ArrayType *GUCArrayReset(ArrayType *array);
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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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/* GUC serialization */
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extern Size EstimateGUCStateSpace(void);
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extern void SerializeGUCState(Size maxsize, char *start_address);
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extern void RestoreGUCState(void *gucstate);
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/* Support for messages reported from GUC check hooks */
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extern PGDLLIMPORT char *GUC_check_errmsg_string;
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extern PGDLLIMPORT char *GUC_check_errdetail_string;
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extern PGDLLIMPORT char *GUC_check_errhint_string;
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extern void GUC_check_errcode(int sqlerrcode);
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#define GUC_check_errmsg \
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pre_format_elog_string(errno, TEXTDOMAIN), \
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GUC_check_errmsg_string = format_elog_string
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#define GUC_check_errdetail \
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pre_format_elog_string(errno, TEXTDOMAIN), \
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GUC_check_errdetail_string = format_elog_string
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#define GUC_check_errhint \
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pre_format_elog_string(errno, TEXTDOMAIN), \
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GUC_check_errhint_string = format_elog_string
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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 bool check_default_tablespace(char **newval, void **extra, GucSource source);
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extern bool check_temp_tablespaces(char **newval, void **extra, GucSource source);
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extern void assign_temp_tablespaces(const char *newval, void *extra);
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/* in catalog/namespace.c */
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extern bool check_search_path(char **newval, void **extra, GucSource source);
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extern void assign_search_path(const char *newval, void *extra);
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/* in access/transam/xlog.c */
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extern bool check_wal_buffers(int *newval, void **extra, GucSource source);
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extern void assign_xlog_sync_method(int new_sync_method, void *extra);
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#endif /* GUC_H */
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