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postgres/src/backend/utils/misc/guc.c
Bruce Momjian 9a39ba4b0f Trivial patch to increase max_fsm_pages as per earlier discussion. 
Philip Warner
2002-12-27 14:06:34 +00:00

3051 lines
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/*--------------------------------------------------------------------
* guc.c
*
* Support for grand unified configuration scheme, including SET
* command, configuration file, and command line options.
* See src/backend/utils/misc/README for more information.
*
* $Header: /cvsroot/pgsql/src/backend/utils/misc/guc.c,v 1.109 2002/12/27 14:06:34 momjian Exp $
*
* Copyright 2000 by PostgreSQL Global Development Group
* Written by Peter Eisentraut <peter_e@gmx.net>.
*--------------------------------------------------------------------
*/
#include "postgres.h"
#include <errno.h>
#include <float.h>
#include <limits.h>
#include <unistd.h>
#include "utils/guc.h"
#include "access/xlog.h"
#include "catalog/namespace.h"
#include "catalog/pg_type.h"
#include "commands/async.h"
#include "commands/variable.h"
#include "commands/vacuum.h"
#include "executor/executor.h"
#include "fmgr.h"
#include "funcapi.h"
#include "libpq/auth.h"
#include "libpq/pqcomm.h"
#include "mb/pg_wchar.h"
#include "miscadmin.h"
#include "optimizer/cost.h"
#include "optimizer/geqo.h"
#include "optimizer/paths.h"
#include "optimizer/planmain.h"
#include "parser/parse_expr.h"
#include "storage/fd.h"
#include "storage/freespace.h"
#include "storage/lock.h"
#include "storage/proc.h"
#include "tcop/tcopprot.h"
#include "utils/array.h"
#include "utils/builtins.h"
#include "utils/datetime.h"
#include "utils/elog.h"
#include "utils/pg_locale.h"
#include "pgstat.h"
/* XXX these should be in other modules' header files */
extern bool Log_connections;
extern int PreAuthDelay;
extern int AuthenticationTimeout;
extern int CheckPointTimeout;
extern bool autocommit;
extern int CommitDelay;
extern int CommitSiblings;
extern bool FixBTree;
#ifdef HAVE_SYSLOG
extern char *Syslog_facility;
extern char *Syslog_ident;
static const char *assign_facility(const char *facility,
bool doit, bool interactive);
#endif
static const char *assign_msglvl(int *var, const char *newval,
bool doit, bool interactive);
/*
* Debugging options
*/
#ifdef USE_ASSERT_CHECKING
bool assert_enabled = true;
#endif
bool log_statement = false;
bool log_duration = false;
bool Debug_print_plan = false;
bool Debug_print_parse = false;
bool Debug_print_rewritten = false;
bool Debug_pretty_print = false;
bool log_parser_stats = false;
bool log_planner_stats = false;
bool log_executor_stats = false;
bool log_statement_stats = false; /* this is sort of all
* three above together */
bool log_btree_build_stats = false;
bool Explain_pretty_print = true;
bool SQL_inheritance = true;
bool Australian_timezones = false;
bool Password_encryption = true;
int log_min_error_statement = ERROR;
char *log_min_error_statement_str = NULL;
const char log_min_error_statement_str_default[] = "panic";
int log_min_messages = NOTICE;
char *log_min_messages_str = NULL;
const char log_min_messages_str_default[] = "notice";
int client_min_messages = NOTICE;
char *client_min_messages_str = NULL;
const char client_min_messages_str_default[] = "notice";
#ifndef PG_KRB_SRVTAB
#define PG_KRB_SRVTAB ""
#endif
/*
* These variables are all dummies that don't do anything, except in some
* cases provide the value for SHOW to display. The real state is elsewhere
* and is kept in sync by assign_hooks.
*/
static double phony_random_seed;
static char *client_encoding_string;
static char *datestyle_string;
static char *default_iso_level_string;
static char *server_encoding_string;
static char *session_authorization_string;
static char *timezone_string;
static char *XactIsoLevel_string;
static const char *assign_defaultxactisolevel(const char *newval,
bool doit, bool interactive);
/*
* Declarations for GUC tables
*
* See src/backend/utils/misc/README for design notes.
*/
enum config_type
{
PGC_BOOL,
PGC_INT,
PGC_REAL,
PGC_STRING
};
/* Generic fields applicable to all types of variables */
struct config_generic
{
/* constant fields, must be set correctly in initial value: */
const char *name; /* name of variable - MUST BE FIRST */
GucContext context; /* context required to set the variable */
int flags; /* flag bits, see below */
/* variable fields, initialized at runtime: */
enum config_type vartype; /* type of variable (set only at startup) */
int status; /* status bits, see below */
GucSource reset_source; /* source of the reset_value */
GucSource session_source; /* source of the session_value */
GucSource tentative_source; /* source of the tentative_value */
GucSource source; /* source of the current actual value */
};
/* bit values in flags field */
#define GUC_LIST_INPUT 0x0001 /* input can be list format */
#define GUC_LIST_QUOTE 0x0002 /* double-quote list elements */
#define GUC_NO_SHOW_ALL 0x0004 /* exclude from SHOW ALL */
#define GUC_NO_RESET_ALL 0x0008 /* exclude from RESET ALL */
/* bit values in status field */
#define GUC_HAVE_TENTATIVE 0x0001 /* tentative value is defined */
#define GUC_HAVE_LOCAL 0x0002 /* a SET LOCAL has been executed */
/* GUC records for specific variable types */
struct config_bool
{
struct config_generic gen;
/* these fields must be set correctly in initial value: */
/* (all but reset_val are constants) */
bool *variable;
bool reset_val;
bool (*assign_hook) (bool newval, bool doit, bool interactive);
const char *(*show_hook) (void);
/* variable fields, initialized at runtime: */
bool session_val;
bool tentative_val;
};
struct config_int
{
struct config_generic gen;
/* these fields must be set correctly in initial value: */
/* (all but reset_val are constants) */
int *variable;
int reset_val;
int min;
int max;
bool (*assign_hook) (int newval, bool doit, bool interactive);
const char *(*show_hook) (void);
/* variable fields, initialized at runtime: */
int session_val;
int tentative_val;
};
struct config_real
{
struct config_generic gen;
/* these fields must be set correctly in initial value: */
/* (all but reset_val are constants) */
double *variable;
double reset_val;
double min;
double max;
bool (*assign_hook) (double newval, bool doit, bool interactive);
const char *(*show_hook) (void);
/* variable fields, initialized at runtime: */
double session_val;
double tentative_val;
};
struct config_string
{
struct config_generic gen;
/* these fields must be set correctly in initial value: */
/* (all are constants) */
char **variable;
const char *boot_val;
const char *(*assign_hook) (const char *newval, bool doit, bool interactive);
const char *(*show_hook) (void);
/* variable fields, initialized at runtime: */
char *reset_val;
char *session_val;
char *tentative_val;
};
/* Macros for freeing malloc'd pointers only if appropriate to do so */
/* Some of these tests are probably redundant, but be safe ... */
#define SET_STRING_VARIABLE(rec, newval) \
do { \
if (*(rec)->variable && \
*(rec)->variable != (rec)->reset_val && \
*(rec)->variable != (rec)->session_val && \
*(rec)->variable != (rec)->tentative_val) \
free(*(rec)->variable); \
*(rec)->variable = (newval); \
} while (0)
#define SET_STRING_RESET_VAL(rec, newval) \
do { \
if ((rec)->reset_val && \
(rec)->reset_val != *(rec)->variable && \
(rec)->reset_val != (rec)->session_val && \
(rec)->reset_val != (rec)->tentative_val) \
free((rec)->reset_val); \
(rec)->reset_val = (newval); \
} while (0)
#define SET_STRING_SESSION_VAL(rec, newval) \
do { \
if ((rec)->session_val && \
(rec)->session_val != *(rec)->variable && \
(rec)->session_val != (rec)->reset_val && \
(rec)->session_val != (rec)->tentative_val) \
free((rec)->session_val); \
(rec)->session_val = (newval); \
} while (0)
#define SET_STRING_TENTATIVE_VAL(rec, newval) \
do { \
if ((rec)->tentative_val && \
(rec)->tentative_val != *(rec)->variable && \
(rec)->tentative_val != (rec)->reset_val && \
(rec)->tentative_val != (rec)->session_val) \
free((rec)->tentative_val); \
(rec)->tentative_val = (newval); \
} while (0)
/*
* TO ADD AN OPTION:
*
* 1. Declare a global variable of type bool, int, double, or char*
* and make use of it.
*
* 2. Decide at what times it's safe to set the option. See guc.h for
* details.
*
* 3. Decide on a name, a default value, upper and lower bounds (if
* applicable), etc.
*
* 4. Add a record below.
*
* 5. Add it to src/backend/utils/misc/postgresql.conf.sample.
*
* 6. Add it to src/bin/psql/tab-complete.c, if it's a USERSET option.
*
* 7. Don't forget to document the option.
*/
/******** option records follow ********/
static struct config_bool
ConfigureNamesBool[] =
{
{
{"enable_seqscan", PGC_USERSET}, &enable_seqscan,
true, NULL, NULL
},
{
{"enable_indexscan", PGC_USERSET}, &enable_indexscan,
true, NULL, NULL
},
{
{"enable_tidscan", PGC_USERSET}, &enable_tidscan,
true, NULL, NULL
},
{
{"enable_sort", PGC_USERSET}, &enable_sort,
true, NULL, NULL
},
{
{"enable_hashagg", PGC_USERSET}, &enable_hashagg,
true, NULL, NULL
},
{
{"enable_nestloop", PGC_USERSET}, &enable_nestloop,
true, NULL, NULL
},
{
{"enable_mergejoin", PGC_USERSET}, &enable_mergejoin,
true, NULL, NULL
},
{
{"enable_hashjoin", PGC_USERSET}, &enable_hashjoin,
true, NULL, NULL
},
{
{"geqo", PGC_USERSET}, &enable_geqo,
true, NULL, NULL
},
{
{"tcpip_socket", PGC_POSTMASTER}, &NetServer,
false, NULL, NULL
},
{
{"ssl", PGC_POSTMASTER}, &EnableSSL,
false, NULL, NULL
},
{
{"fsync", PGC_SIGHUP}, &enableFsync,
true, NULL, NULL
},
{
{"silent_mode", PGC_POSTMASTER}, &SilentMode,
false, NULL, NULL
},
{
{"log_connections", PGC_BACKEND}, &Log_connections,
false, NULL, NULL
},
{
{"log_timestamp", PGC_SIGHUP}, &Log_timestamp,
false, NULL, NULL
},
{
{"log_pid", PGC_SIGHUP}, &Log_pid,
false, NULL, NULL
},
#ifdef USE_ASSERT_CHECKING
{
{"debug_assertions", PGC_USERSET}, &assert_enabled,
true, NULL, NULL
},
#endif
{
{"log_statement", PGC_USERSET}, &log_statement,
false, NULL, NULL
},
{
{"log_duration", PGC_USERSET}, &log_duration,
false, NULL, NULL
},
{
{"debug_print_parse", PGC_USERSET}, &Debug_print_parse,
false, NULL, NULL
},
{
{"debug_print_rewritten", PGC_USERSET}, &Debug_print_rewritten,
false, NULL, NULL
},
{
{"debug_print_plan", PGC_USERSET}, &Debug_print_plan,
false, NULL, NULL
},
{
{"debug_pretty_print", PGC_USERSET}, &Debug_pretty_print,
false, NULL, NULL
},
{
{"log_parser_stats", PGC_USERSET}, &log_parser_stats,
false, NULL, NULL
},
{
{"log_planner_stats", PGC_USERSET}, &log_planner_stats,
false, NULL, NULL
},
{
{"log_executor_stats", PGC_USERSET}, &log_executor_stats,
false, NULL, NULL
},
{
{"log_statement_stats", PGC_USERSET}, &log_statement_stats,
false, NULL, NULL
},
#ifdef BTREE_BUILD_STATS
{
{"log_btree_build_stats", PGC_SUSET}, &log_btree_build_stats,
false, NULL, NULL
},
#endif
{
{"explain_pretty_print", PGC_USERSET}, &Explain_pretty_print,
true, NULL, NULL
},
{
{"stats_start_collector", PGC_POSTMASTER}, &pgstat_collect_startcollector,
true, NULL, NULL
},
{
{"stats_reset_on_server_start", PGC_POSTMASTER}, &pgstat_collect_resetonpmstart,
true, NULL, NULL
},
{
{"stats_command_string", PGC_SUSET}, &pgstat_collect_querystring,
false, NULL, NULL
},
{
{"stats_row_level", PGC_SUSET}, &pgstat_collect_tuplelevel,
false, NULL, NULL
},
{
{"stats_block_level", PGC_SUSET}, &pgstat_collect_blocklevel,
false, NULL, NULL
},
{
{"trace_notify", PGC_USERSET}, &Trace_notify,
false, NULL, NULL
},
#ifdef LOCK_DEBUG
{
{"trace_locks", PGC_SUSET}, &Trace_locks,
false, NULL, NULL
},
{
{"trace_userlocks", PGC_SUSET}, &Trace_userlocks,
false, NULL, NULL
},
{
{"trace_lwlocks", PGC_SUSET}, &Trace_lwlocks,
false, NULL, NULL
},
{
{"debug_deadlocks", PGC_SUSET}, &Debug_deadlocks,
false, NULL, NULL
},
#endif
{
{"log_hostname", PGC_SIGHUP}, &log_hostname,
false, NULL, NULL
},
{
{"log_source_port", PGC_SIGHUP}, &LogSourcePort,
false, NULL, NULL
},
{
{"sql_inheritance", PGC_USERSET}, &SQL_inheritance,
true, NULL, NULL
},
{
{"australian_timezones", PGC_USERSET}, &Australian_timezones,
false, ClearDateCache, NULL
},
{
{"fixbtree", PGC_POSTMASTER}, &FixBTree,
true, NULL, NULL
},
{
{"password_encryption", PGC_USERSET}, &Password_encryption,
true, NULL, NULL
},
{
{"transform_null_equals", PGC_USERSET}, &Transform_null_equals,
false, NULL, NULL
},
{
{"db_user_namespace", PGC_SIGHUP}, &Db_user_namespace,
false, NULL, NULL
},
{
{"autocommit", PGC_USERSET}, &autocommit,
true, NULL, NULL
},
{
{NULL, 0}, NULL, false, NULL, NULL
}
};
static struct config_int
ConfigureNamesInt[] =
{
{
{"default_statistics_target", PGC_USERSET}, &default_statistics_target,
10, 1, 1000, NULL, NULL
},
{
{"geqo_threshold", PGC_USERSET}, &geqo_rels,
DEFAULT_GEQO_RELS, 2, INT_MAX, NULL, NULL
},
{
{"geqo_pool_size", PGC_USERSET}, &Geqo_pool_size,
DEFAULT_GEQO_POOL_SIZE, 0, MAX_GEQO_POOL_SIZE, NULL, NULL
},
{
{"geqo_effort", PGC_USERSET}, &Geqo_effort,
1, 1, INT_MAX, NULL, NULL
},
{
{"geqo_generations", PGC_USERSET}, &Geqo_generations,
0, 0, INT_MAX, NULL, NULL
},
{
{"geqo_random_seed", PGC_USERSET}, &Geqo_random_seed,
-1, INT_MIN, INT_MAX, NULL, NULL
},
{
{"deadlock_timeout", PGC_POSTMASTER}, &DeadlockTimeout,
1000, 0, INT_MAX, NULL, NULL
},
#ifdef HAVE_SYSLOG
{
{"syslog", PGC_SIGHUP}, &Use_syslog,
0, 0, 2, NULL, NULL
},
#endif
/*
* Note: There is some postprocessing done in PostmasterMain() to make
* sure the buffers are at least twice the number of backends, so the
* constraints here are partially unused. Similarly, the superuser
* reserved number is checked to ensure it is less than the max
* backends number.
*/
{
{"max_connections", PGC_POSTMASTER}, &MaxBackends,
DEF_MAXBACKENDS, 1, INT_MAX, NULL, NULL
},
{
{"superuser_reserved_connections", PGC_POSTMASTER}, &ReservedBackends,
2, 0, INT_MAX, NULL, NULL
},
{
{"shared_buffers", PGC_POSTMASTER}, &NBuffers,
DEF_NBUFFERS, 16, INT_MAX, NULL, NULL
},
{
{"port", PGC_POSTMASTER}, &PostPortNumber,
DEF_PGPORT, 1, 65535, NULL, NULL
},
{
{"unix_socket_permissions", PGC_POSTMASTER}, &Unix_socket_permissions,
0777, 0000, 0777, NULL, NULL
},
{
{"sort_mem", PGC_USERSET}, &SortMem,
1024, 8 * BLCKSZ / 1024, INT_MAX, NULL, NULL
},
{
{"vacuum_mem", PGC_USERSET}, &VacuumMem,
8192, 1024, INT_MAX, NULL, NULL
},
{
{"max_files_per_process", PGC_BACKEND}, &max_files_per_process,
1000, 25, INT_MAX, NULL, NULL
},
#ifdef LOCK_DEBUG
{
{"trace_lock_oidmin", PGC_SUSET}, &Trace_lock_oidmin,
BootstrapObjectIdData, 1, INT_MAX, NULL, NULL
},
{
{"trace_lock_table", PGC_SUSET}, &Trace_lock_table,
0, 0, INT_MAX, NULL, NULL
},
#endif
{
{"max_expr_depth", PGC_USERSET}, &max_expr_depth,
DEFAULT_MAX_EXPR_DEPTH, 10, INT_MAX, NULL, NULL
},
{
{"statement_timeout", PGC_USERSET}, &StatementTimeout,
0, 0, INT_MAX, NULL, NULL
},
{
{"max_fsm_relations", PGC_POSTMASTER}, &MaxFSMRelations,
1000, 10, INT_MAX, NULL, NULL
},
{
{"max_fsm_pages", PGC_POSTMASTER}, &MaxFSMPages,
10000, 1000, INT_MAX, NULL, NULL
},
{
{"max_locks_per_transaction", PGC_POSTMASTER}, &max_locks_per_xact,
64, 10, INT_MAX, NULL, NULL
},
{
{"authentication_timeout", PGC_SIGHUP}, &AuthenticationTimeout,
60, 1, 600, NULL, NULL
},
{
{"pre_auth_delay", PGC_SIGHUP}, &PreAuthDelay,
0, 0, 60, NULL, NULL
},
{
{"checkpoint_segments", PGC_SIGHUP}, &CheckPointSegments,
3, 1, INT_MAX, NULL, NULL
},
{
{"checkpoint_timeout", PGC_SIGHUP}, &CheckPointTimeout,
300, 30, 3600, NULL, NULL
},
{
{"checkpoint_warning", PGC_SIGHUP}, &CheckPointWarning,
30, 0, INT_MAX, NULL, NULL
},
{
{"wal_buffers", PGC_POSTMASTER}, &XLOGbuffers,
8, 4, INT_MAX, NULL, NULL
},
{
{"wal_debug", PGC_SUSET}, &XLOG_DEBUG,
0, 0, 16, NULL, NULL
},
{
{"commit_delay", PGC_USERSET}, &CommitDelay,
0, 0, 100000, NULL, NULL
},
{
{"commit_siblings", PGC_USERSET}, &CommitSiblings,
5, 1, 1000, NULL, NULL
},
{
{"extra_float_digits", PGC_USERSET}, &extra_float_digits,
0, -15, 2, NULL, NULL
},
{
{NULL, 0}, NULL, 0, 0, 0, NULL, NULL
}
};
static struct config_real
ConfigureNamesReal[] =
{
{
{"effective_cache_size", PGC_USERSET}, &effective_cache_size,
DEFAULT_EFFECTIVE_CACHE_SIZE, 0, DBL_MAX, NULL, NULL
},
{
{"random_page_cost", PGC_USERSET}, &random_page_cost,
DEFAULT_RANDOM_PAGE_COST, 0, DBL_MAX, NULL, NULL
},
{
{"cpu_tuple_cost", PGC_USERSET}, &cpu_tuple_cost,
DEFAULT_CPU_TUPLE_COST, 0, DBL_MAX, NULL, NULL
},
{
{"cpu_index_tuple_cost", PGC_USERSET}, &cpu_index_tuple_cost,
DEFAULT_CPU_INDEX_TUPLE_COST, 0, DBL_MAX, NULL, NULL
},
{
{"cpu_operator_cost", PGC_USERSET}, &cpu_operator_cost,
DEFAULT_CPU_OPERATOR_COST, 0, DBL_MAX, NULL, NULL
},
{
{"geqo_selection_bias", PGC_USERSET}, &Geqo_selection_bias,
DEFAULT_GEQO_SELECTION_BIAS, MIN_GEQO_SELECTION_BIAS,
MAX_GEQO_SELECTION_BIAS, NULL, NULL
},
{
{"seed", PGC_USERSET, GUC_NO_SHOW_ALL | GUC_NO_RESET_ALL},
&phony_random_seed,
0.5, 0.0, 1.0, assign_random_seed, show_random_seed
},
{
{NULL, 0}, NULL, 0.0, 0.0, 0.0, NULL, NULL
}
};
static struct config_string
ConfigureNamesString[] =
{
{
{"client_encoding", PGC_USERSET}, &client_encoding_string,
"SQL_ASCII", assign_client_encoding, NULL
},
{
{"client_min_messages", PGC_USERSET}, &client_min_messages_str,
client_min_messages_str_default, assign_client_min_messages, NULL
},
{
{"log_min_error_statement", PGC_USERSET}, &log_min_error_statement_str,
log_min_error_statement_str_default, assign_min_error_statement, NULL
},
{
{"DateStyle", PGC_USERSET, GUC_LIST_INPUT}, &datestyle_string,
"ISO, US", assign_datestyle, show_datestyle
},
{
{"default_transaction_isolation", PGC_USERSET}, &default_iso_level_string,
"read committed", assign_defaultxactisolevel, NULL
},
{
{"dynamic_library_path", PGC_SUSET}, &Dynamic_library_path,
"$libdir", NULL, NULL
},
{
{"krb_server_keyfile", PGC_POSTMASTER}, &pg_krb_server_keyfile,
PG_KRB_SRVTAB, NULL, NULL
},
/* See main.c about why defaults for LC_foo are not all alike */
{
{"lc_messages", PGC_SUSET}, &locale_messages,
"", locale_messages_assign, NULL
},
{
{"lc_monetary", PGC_USERSET}, &locale_monetary,
"C", locale_monetary_assign, NULL
},
{
{"lc_numeric", PGC_USERSET}, &locale_numeric,
"C", locale_numeric_assign, NULL
},
{
{"lc_time", PGC_USERSET}, &locale_time,
"C", locale_time_assign, NULL
},
{
{"search_path", PGC_USERSET, GUC_LIST_INPUT | GUC_LIST_QUOTE},
&namespace_search_path,
"$user,public", assign_search_path, NULL
},
{
{"server_encoding", PGC_USERSET}, &server_encoding_string,
"SQL_ASCII", assign_server_encoding, show_server_encoding
},
{
{"log_min_messages", PGC_USERSET}, &log_min_messages_str,
log_min_messages_str_default, assign_log_min_messages, NULL
},
{
{"session_authorization", PGC_USERSET, GUC_NO_SHOW_ALL | GUC_NO_RESET_ALL},
&session_authorization_string,
NULL, assign_session_authorization, show_session_authorization
},
#ifdef HAVE_SYSLOG
{
{"syslog_facility", PGC_POSTMASTER}, &Syslog_facility,
"LOCAL0", assign_facility, NULL
},
{
{"syslog_ident", PGC_POSTMASTER}, &Syslog_ident,
"postgres", NULL, NULL
},
#endif
{
{"TimeZone", PGC_USERSET}, &timezone_string,
"UNKNOWN", assign_timezone, show_timezone
},
{
{"TRANSACTION ISOLATION LEVEL", PGC_USERSET, GUC_NO_RESET_ALL},
&XactIsoLevel_string,
NULL, assign_XactIsoLevel, show_XactIsoLevel
},
{
{"unix_socket_group", PGC_POSTMASTER}, &Unix_socket_group,
"", NULL, NULL
},
{
{"unix_socket_directory", PGC_POSTMASTER}, &UnixSocketDir,
"", NULL, NULL
},
{
{"virtual_host", PGC_POSTMASTER}, &VirtualHost,
"", NULL, NULL
},
{
{"wal_sync_method", PGC_SIGHUP}, &XLOG_sync_method,
XLOG_sync_method_default, assign_xlog_sync_method, NULL
},
{
{NULL, 0}, NULL, NULL, NULL, NULL
}
};
/******** end of options list ********/
/*
* Actual lookup of variables is done through this single, sorted array.
*/
static struct config_generic **guc_variables;
static int num_guc_variables;
static bool guc_dirty; /* TRUE if need to do commit/abort work */
static char *guc_string_workspace; /* for avoiding memory leaks */
static int guc_var_compare(const void *a, const void *b);
static char *_ShowOption(struct config_generic * record);
/*
* Build the sorted array. This is split out so that it could be
* re-executed after startup (eg, we could allow loadable modules to
* add vars, and then we'd need to re-sort).
*/
static void
build_guc_variables(void)
{
int num_vars = 0;
struct config_generic **guc_vars;
int i;
for (i = 0; ConfigureNamesBool[i].gen.name; i++)
{
struct config_bool *conf = &ConfigureNamesBool[i];
/* Rather than requiring vartype to be filled in by hand, do this: */
conf->gen.vartype = PGC_BOOL;
num_vars++;
}
for (i = 0; ConfigureNamesInt[i].gen.name; i++)
{
struct config_int *conf = &ConfigureNamesInt[i];
conf->gen.vartype = PGC_INT;
num_vars++;
}
for (i = 0; ConfigureNamesReal[i].gen.name; i++)
{
struct config_real *conf = &ConfigureNamesReal[i];
conf->gen.vartype = PGC_REAL;
num_vars++;
}
for (i = 0; ConfigureNamesString[i].gen.name; i++)
{
struct config_string *conf = &ConfigureNamesString[i];
conf->gen.vartype = PGC_STRING;
num_vars++;
}
guc_vars = (struct config_generic **)
malloc(num_vars * sizeof(struct config_generic *));
if (!guc_vars)
elog(PANIC, "out of memory");
num_vars = 0;
for (i = 0; ConfigureNamesBool[i].gen.name; i++)
guc_vars[num_vars++] = &ConfigureNamesBool[i].gen;
for (i = 0; ConfigureNamesInt[i].gen.name; i++)
guc_vars[num_vars++] = &ConfigureNamesInt[i].gen;
for (i = 0; ConfigureNamesReal[i].gen.name; i++)
guc_vars[num_vars++] = &ConfigureNamesReal[i].gen;
for (i = 0; ConfigureNamesString[i].gen.name; i++)
guc_vars[num_vars++] = &ConfigureNamesString[i].gen;
qsort((void *) guc_vars, num_vars, sizeof(struct config_generic *),
guc_var_compare);
if (guc_variables)
free(guc_variables);
guc_variables = guc_vars;
num_guc_variables = num_vars;
}
/*
* Look up option NAME. If it exists, return a pointer to its record,
* else return NULL.
*/
static struct config_generic *
find_option(const char *name)
{
const char **key = &name;
struct config_generic **res;
Assert(name);
/*
* by equating const char ** with struct config_generic *, we are
* assuming the name field is first in config_generic.
*/
res = (struct config_generic **) bsearch((void *) &key,
(void *) guc_variables,
num_guc_variables,
sizeof(struct config_generic *),
guc_var_compare);
if (res)
return *res;
return NULL;
}
/*
* comparator for qsorting and bsearching guc_variables array
*/
static int
guc_var_compare(const void *a, const void *b)
{
struct config_generic *confa = *(struct config_generic **) a;
struct config_generic *confb = *(struct config_generic **) b;
const char *namea;
const char *nameb;
/*
* The temptation to use strcasecmp() here must be resisted, because
* the array ordering has to remain stable across setlocale() calls.
* So, build our own with a simple ASCII-only downcasing.
*/
namea = confa->name;
nameb = confb->name;
while (*namea && *nameb)
{
char cha = *namea++;
char chb = *nameb++;
if (cha >= 'A' && cha <= 'Z')
cha += 'a' - 'A';
if (chb >= 'A' && chb <= 'Z')
chb += 'a' - 'A';
if (cha != chb)
return cha - chb;
}
if (*namea)
return 1; /* a is longer */
if (*nameb)
return -1; /* b is longer */
return 0;
}
/*
* Initialize GUC options during program startup.
*/
void
InitializeGUCOptions(void)
{
int i;
char *env;
/*
* Build sorted array of all GUC variables.
*/
build_guc_variables();
/*
* Load all variables with their compiled-in defaults, and initialize
* status fields as needed.
*
* Note: any errors here are reported with plain ol' printf, since we
* shouldn't assume that elog will work before we've initialized its
* config variables. An error here would be unexpected anyway...
*/
for (i = 0; i < num_guc_variables; i++)
{
struct config_generic *gconf = guc_variables[i];
gconf->status = 0;
gconf->reset_source = PGC_S_DEFAULT;
gconf->session_source = PGC_S_DEFAULT;
gconf->tentative_source = PGC_S_DEFAULT;
gconf->source = PGC_S_DEFAULT;
switch (gconf->vartype)
{
case PGC_BOOL:
{
struct config_bool *conf = (struct config_bool *) gconf;
if (conf->assign_hook)
if (!(*conf->assign_hook) (conf->reset_val, true, false))
fprintf(stderr, "Failed to initialize %s to %d\n",
conf->gen.name, (int) conf->reset_val);
*conf->variable = conf->reset_val;
conf->session_val = conf->reset_val;
break;
}
case PGC_INT:
{
struct config_int *conf = (struct config_int *) gconf;
Assert(conf->reset_val >= conf->min);
Assert(conf->reset_val <= conf->max);
if (conf->assign_hook)
if (!(*conf->assign_hook) (conf->reset_val, true, false))
fprintf(stderr, "Failed to initialize %s to %d\n",
conf->gen.name, conf->reset_val);
*conf->variable = conf->reset_val;
conf->session_val = conf->reset_val;
break;
}
case PGC_REAL:
{
struct config_real *conf = (struct config_real *) gconf;
Assert(conf->reset_val >= conf->min);
Assert(conf->reset_val <= conf->max);
if (conf->assign_hook)
if (!(*conf->assign_hook) (conf->reset_val, true, false))
fprintf(stderr, "Failed to initialize %s to %g\n",
conf->gen.name, conf->reset_val);
*conf->variable = conf->reset_val;
conf->session_val = conf->reset_val;
break;
}
case PGC_STRING:
{
struct config_string *conf = (struct config_string *) gconf;
char *str;
*conf->variable = NULL;
conf->reset_val = NULL;
conf->session_val = NULL;
conf->tentative_val = NULL;
if (conf->boot_val == NULL)
{
/* Cannot set value yet */
break;
}
str = strdup(conf->boot_val);
if (str == NULL)
elog(PANIC, "out of memory");
conf->reset_val = str;
if (conf->assign_hook)
{
const char *newstr;
newstr = (*conf->assign_hook) (str, true, false);
if (newstr == NULL)
{
fprintf(stderr, "Failed to initialize %s to '%s'\n",
conf->gen.name, str);
}
else if (newstr != str)
{
free(str);
/*
* See notes in set_config_option about
* casting
*/
str = (char *) newstr;
conf->reset_val = str;
}
}
*conf->variable = str;
conf->session_val = str;
break;
}
}
}
guc_dirty = false;
guc_string_workspace = NULL;
/*
* Prevent any attempt to override TRANSACTION ISOLATION LEVEL from
* non-interactive sources.
*/
SetConfigOption("TRANSACTION ISOLATION LEVEL", "default",
PGC_POSTMASTER, PGC_S_OVERRIDE);
/*
* For historical reasons, some GUC parameters can receive defaults
* from environment variables. Process those settings.
*/
env = getenv("PGPORT");
if (env != NULL)
SetConfigOption("port", env, PGC_POSTMASTER, PGC_S_ENV_VAR);
env = getenv("PGDATESTYLE");
if (env != NULL)
SetConfigOption("datestyle", env, PGC_POSTMASTER, PGC_S_ENV_VAR);
env = getenv("TZ");
if (env != NULL)
SetConfigOption("timezone", env, PGC_POSTMASTER, PGC_S_ENV_VAR);
env = getenv("PGCLIENTENCODING");
if (env != NULL)
SetConfigOption("client_encoding", env, PGC_POSTMASTER, PGC_S_ENV_VAR);
}
/*
* Reset all options to their saved default values (implements RESET ALL)
*/
void
ResetAllOptions(void)
{
int i;
for (i = 0; i < num_guc_variables; i++)
{
struct config_generic *gconf = guc_variables[i];
/* Don't reset non-SET-able values */
if (gconf->context != PGC_SUSET && gconf->context != PGC_USERSET)
continue;
/* Don't reset if special exclusion from RESET ALL */
if (gconf->flags & GUC_NO_RESET_ALL)
continue;
/* No need to reset if wasn't SET */
if (gconf->source <= PGC_S_OVERRIDE)
continue;
switch (gconf->vartype)
{
case PGC_BOOL:
{
struct config_bool *conf = (struct config_bool *) gconf;
if (conf->assign_hook)
if (!(*conf->assign_hook) (conf->reset_val, true, true))
elog(ERROR, "Failed to reset %s", conf->gen.name);
*conf->variable = conf->reset_val;
conf->tentative_val = conf->reset_val;
conf->gen.source = conf->gen.reset_source;
conf->gen.tentative_source = conf->gen.reset_source;
conf->gen.status |= GUC_HAVE_TENTATIVE;
guc_dirty = true;
break;
}
case PGC_INT:
{
struct config_int *conf = (struct config_int *) gconf;
if (conf->assign_hook)
if (!(*conf->assign_hook) (conf->reset_val, true, true))
elog(ERROR, "Failed to reset %s", conf->gen.name);
*conf->variable = conf->reset_val;
conf->tentative_val = conf->reset_val;
conf->gen.source = conf->gen.reset_source;
conf->gen.tentative_source = conf->gen.reset_source;
conf->gen.status |= GUC_HAVE_TENTATIVE;
guc_dirty = true;
break;
}
case PGC_REAL:
{
struct config_real *conf = (struct config_real *) gconf;
if (conf->assign_hook)
if (!(*conf->assign_hook) (conf->reset_val, true, true))
elog(ERROR, "Failed to reset %s", conf->gen.name);
*conf->variable = conf->reset_val;
conf->tentative_val = conf->reset_val;
conf->gen.source = conf->gen.reset_source;
conf->gen.tentative_source = conf->gen.reset_source;
conf->gen.status |= GUC_HAVE_TENTATIVE;
guc_dirty = true;
break;
}
case PGC_STRING:
{
struct config_string *conf = (struct config_string *) gconf;
char *str;
if (conf->reset_val == NULL)
{
/* Nothing to reset to, as yet; so do nothing */
break;
}
/* We need not strdup here */
str = conf->reset_val;
if (conf->assign_hook)
{
const char *newstr;
newstr = (*conf->assign_hook) (str, true, true);
if (newstr == NULL)
elog(ERROR, "Failed to reset %s", conf->gen.name);
else if (newstr != str)
{
/*
* See notes in set_config_option about
* casting
*/
str = (char *) newstr;
}
}
SET_STRING_VARIABLE(conf, str);
SET_STRING_TENTATIVE_VAL(conf, str);
conf->gen.source = conf->gen.reset_source;
conf->gen.tentative_source = conf->gen.reset_source;
conf->gen.status |= GUC_HAVE_TENTATIVE;
guc_dirty = true;
break;
}
}
}
}
/*
* Do GUC processing at transaction commit or abort.
*/
void
AtEOXact_GUC(bool isCommit)
{
int i;
/* Quick exit if nothing's changed in this transaction */
if (!guc_dirty)
return;
/* Prevent memory leak if elog during an assign_hook */
if (guc_string_workspace)
{
free(guc_string_workspace);
guc_string_workspace = NULL;
}
for (i = 0; i < num_guc_variables; i++)
{
struct config_generic *gconf = guc_variables[i];
/* Skip if nothing's happened to this var in this transaction */
if (gconf->status == 0)
continue;
switch (gconf->vartype)
{
case PGC_BOOL:
{
struct config_bool *conf = (struct config_bool *) gconf;
if (isCommit && (conf->gen.status & GUC_HAVE_TENTATIVE))
{
conf->session_val = conf->tentative_val;
conf->gen.session_source = conf->gen.tentative_source;
}
if (*conf->variable != conf->session_val)
{
if (conf->assign_hook)
if (!(*conf->assign_hook) (conf->session_val,
true, false))
elog(LOG, "Failed to commit %s", conf->gen.name);
*conf->variable = conf->session_val;
}
conf->gen.source = conf->gen.session_source;
conf->gen.status = 0;
break;
}
case PGC_INT:
{
struct config_int *conf = (struct config_int *) gconf;
if (isCommit && (conf->gen.status & GUC_HAVE_TENTATIVE))
{
conf->session_val = conf->tentative_val;
conf->gen.session_source = conf->gen.tentative_source;
}
if (*conf->variable != conf->session_val)
{
if (conf->assign_hook)
if (!(*conf->assign_hook) (conf->session_val,
true, false))
elog(LOG, "Failed to commit %s", conf->gen.name);
*conf->variable = conf->session_val;
}
conf->gen.source = conf->gen.session_source;
conf->gen.status = 0;
break;
}
case PGC_REAL:
{
struct config_real *conf = (struct config_real *) gconf;
if (isCommit && (conf->gen.status & GUC_HAVE_TENTATIVE))
{
conf->session_val = conf->tentative_val;
conf->gen.session_source = conf->gen.tentative_source;
}
if (*conf->variable != conf->session_val)
{
if (conf->assign_hook)
if (!(*conf->assign_hook) (conf->session_val,
true, false))
elog(LOG, "Failed to commit %s", conf->gen.name);
*conf->variable = conf->session_val;
}
conf->gen.source = conf->gen.session_source;
conf->gen.status = 0;
break;
}
case PGC_STRING:
{
struct config_string *conf = (struct config_string *) gconf;
if (isCommit && (conf->gen.status & GUC_HAVE_TENTATIVE))
{
SET_STRING_SESSION_VAL(conf, conf->tentative_val);
conf->gen.session_source = conf->gen.tentative_source;
conf->tentative_val = NULL; /* transfer ownership */
}
else
SET_STRING_TENTATIVE_VAL(conf, NULL);
if (*conf->variable != conf->session_val)
{
char *str = conf->session_val;
if (conf->assign_hook)
{
const char *newstr;
newstr = (*conf->assign_hook) (str, true, false);
if (newstr == NULL)
elog(LOG, "Failed to commit %s", conf->gen.name);
else if (newstr != str)
{
/*
* See notes in set_config_option about
* casting
*/
str = (char *) newstr;
SET_STRING_SESSION_VAL(conf, str);
}
}
SET_STRING_VARIABLE(conf, str);
}
conf->gen.source = conf->gen.session_source;
conf->gen.status = 0;
break;
}
}
}
guc_dirty = false;
}
/*
* Try to interpret value as boolean value. Valid values are: true,
* false, yes, no, on, off, 1, 0. If the string parses okay, return
* true, else false. If result is not NULL, return the parsing result
* there.
*/
static bool
parse_bool(const char *value, bool *result)
{
size_t len = strlen(value);
if (strncasecmp(value, "true", len) == 0)
{
if (result)
*result = true;
}
else if (strncasecmp(value, "false", len) == 0)
{
if (result)
*result = false;
}
else if (strncasecmp(value, "yes", len) == 0)
{
if (result)
*result = true;
}
else if (strncasecmp(value, "no", len) == 0)
{
if (result)
*result = false;
}
else if (strcasecmp(value, "on") == 0)
{
if (result)
*result = true;
}
else if (strcasecmp(value, "off") == 0)
{
if (result)
*result = false;
}
else if (strcasecmp(value, "1") == 0)
{
if (result)
*result = true;
}
else if (strcasecmp(value, "0") == 0)
{
if (result)
*result = false;
}
else
return false;
return true;
}
/*
* Try to parse value as an integer. The accepted formats are the
* usual decimal, octal, or hexadecimal formats. If the string parses
* okay, return true, else false. If result is not NULL, return the
* value there.
*/
static bool
parse_int(const char *value, int *result)
{
long val;
char *endptr;
errno = 0;
val = strtol(value, &endptr, 0);
if (endptr == value || *endptr != '\0' || errno == ERANGE
#ifdef HAVE_LONG_INT_64
/* if long > 32 bits, check for overflow of int4 */
|| val != (long) ((int32) val)
#endif
)
return false;
if (result)
*result = (int) val;
return true;
}
/*
* Try to parse value as a floating point constant in the usual
* format. If the value parsed okay return true, else false. If
* result is not NULL, return the semantic value there.
*/
static bool
parse_real(const char *value, double *result)
{
double val;
char *endptr;
errno = 0;
val = strtod(value, &endptr);
if (endptr == value || *endptr != '\0' || errno == ERANGE)
return false;
if (result)
*result = val;
return true;
}
/*
* Sets option `name' to given value. The value should be a string
* which is going to be parsed and converted to the appropriate data
* type. The context and source parameters indicate in which context this
* function is being called so it can apply the access restrictions
* properly.
*
* If value is NULL, set the option to its default value. If the
* parameter DoIt is false then don't really set the option but do all
* the checks to see if it would work.
*
* If there is an error (non-existing option, invalid value) then an
* elog(ERROR) is thrown *unless* this is called in a context where we
* don't want to elog (currently, startup or SIGHUP config file reread).
* In that case we write a suitable error message via elog(DEBUG) and
* return false. This is working around the deficiencies in the elog
* mechanism, so don't blame me. In all other cases, the function
* returns true, including cases where the input is valid but we chose
* not to apply it because of context or source-priority considerations.
*
* See also SetConfigOption for an external interface.
*/
bool
set_config_option(const char *name, const char *value,
GucContext context, GucSource source,
bool isLocal, bool DoIt)
{
struct config_generic *record;
int elevel;
bool interactive;
bool makeDefault;
if (context == PGC_SIGHUP || source == PGC_S_DEFAULT)
elevel = DEBUG1;
else if (source == PGC_S_DATABASE || source == PGC_S_USER)
elevel = INFO;
else
elevel = ERROR;
record = find_option(name);
if (record == NULL)
{
elog(elevel, "'%s' is not a valid option name", name);
return false;
}
/*
* Check if the option can be set at this time. See guc.h for the
* precise rules. Note that we don't want to throw errors if we're in
* the SIGHUP context. In that case we just ignore the attempt and
* return true.
*/
switch (record->context)
{
case PGC_POSTMASTER:
if (context == PGC_SIGHUP)
return true;
if (context != PGC_POSTMASTER)
{
elog(elevel, "'%s' cannot be changed after server start",
name);
return false;
}
break;
case PGC_SIGHUP:
if (context != PGC_SIGHUP && context != PGC_POSTMASTER)
{
elog(elevel, "'%s' cannot be changed now", name);
return false;
}
/*
* Hmm, the idea of the SIGHUP context is "ought to be global,
* but can be changed after postmaster start". But there's
* nothing that prevents a crafty administrator from sending
* SIGHUP signals to individual backends only.
*/
break;
case PGC_BACKEND:
if (context == PGC_SIGHUP)
{
/*
* If a PGC_BACKEND parameter is changed in the config
* file, we want to accept the new value in the postmaster
* (whence it will propagate to subsequently-started
* backends), but ignore it in existing backends. This is
* a tad klugy, but necessary because we don't re-read the
* config file during backend start.
*/
if (IsUnderPostmaster)
return true;
}
else if (context != PGC_BACKEND && context != PGC_POSTMASTER)
{
elog(elevel, "'%s' cannot be set after connection start",
name);
return false;
}
break;
case PGC_SUSET:
if (context == PGC_USERSET || context == PGC_BACKEND)
{
elog(elevel, "'%s': permission denied", name);
return false;
}
break;
case PGC_USERSET:
/* always okay */
break;
}
/* Should we report errors interactively? */
interactive = (source >= PGC_S_SESSION);
/*
* Should we set reset/session values? (If so, the behavior is not
* transactional.)
*/
makeDefault = DoIt && (source <= PGC_S_OVERRIDE) && (value != NULL);
/*
* Ignore attempted set if overridden by previously processed setting.
* However, if DoIt is false then plow ahead anyway since we are
* trying to find out if the value is potentially good, not actually
* use it. Also keep going if makeDefault is true, since we may want
* to set the reset/session values even if we can't set the variable
* itself.
*/
if (record->source > source)
{
if (DoIt && !makeDefault)
{
elog(DEBUG2, "%s: setting ignored because previous source is higher priority",
name);
return true;
}
DoIt = false; /* we won't change the variable itself */
}
/*
* Evaluate value and set variable
*/
switch (record->vartype)
{
case PGC_BOOL:
{
struct config_bool *conf = (struct config_bool *) record;
bool newval;
if (value)
{
if (!parse_bool(value, &newval))
{
elog(elevel, "option '%s' requires a boolean value",
name);
return false;
}
}
else
{
newval = conf->reset_val;
source = conf->gen.reset_source;
}
if (conf->assign_hook)
if (!(*conf->assign_hook) (newval, DoIt, interactive))
{
elog(elevel, "invalid value for option '%s': %d",
name, (int) newval);
return false;
}
if (DoIt || makeDefault)
{
if (DoIt)
{
*conf->variable = newval;
conf->gen.source = source;
}
if (makeDefault)
{
if (conf->gen.reset_source <= source)
{
conf->reset_val = newval;
conf->gen.reset_source = source;
}
if (conf->gen.session_source <= source)
{
conf->session_val = newval;
conf->gen.session_source = source;
}
}
else if (isLocal)
{
conf->gen.status |= GUC_HAVE_LOCAL;
guc_dirty = true;
}
else
{
conf->tentative_val = newval;
conf->gen.tentative_source = source;
conf->gen.status |= GUC_HAVE_TENTATIVE;
guc_dirty = true;
}
}
break;
}
case PGC_INT:
{
struct config_int *conf = (struct config_int *) record;
int newval;
if (value)
{
if (!parse_int(value, &newval))
{
elog(elevel, "option '%s' expects an integer value",
name);
return false;
}
if (newval < conf->min || newval > conf->max)
{
elog(elevel, "option '%s' value %d is outside"
" of permissible range [%d .. %d]",
name, newval, conf->min, conf->max);
return false;
}
}
else
{
newval = conf->reset_val;
source = conf->gen.reset_source;
}
if (conf->assign_hook)
if (!(*conf->assign_hook) (newval, DoIt, interactive))
{
elog(elevel, "invalid value for option '%s': %d",
name, newval);
return false;
}
if (DoIt || makeDefault)
{
if (DoIt)
{
*conf->variable = newval;
conf->gen.source = source;
}
if (makeDefault)
{
if (conf->gen.reset_source <= source)
{
conf->reset_val = newval;
conf->gen.reset_source = source;
}
if (conf->gen.session_source <= source)
{
conf->session_val = newval;
conf->gen.session_source = source;
}
}
else if (isLocal)
{
conf->gen.status |= GUC_HAVE_LOCAL;
guc_dirty = true;
}
else
{
conf->tentative_val = newval;
conf->gen.tentative_source = source;
conf->gen.status |= GUC_HAVE_TENTATIVE;
guc_dirty = true;
}
}
break;
}
case PGC_REAL:
{
struct config_real *conf = (struct config_real *) record;
double newval;
if (value)
{
if (!parse_real(value, &newval))
{
elog(elevel, "option '%s' expects a real number",
name);
return false;
}
if (newval < conf->min || newval > conf->max)
{
elog(elevel, "option '%s' value %g is outside"
" of permissible range [%g .. %g]",
name, newval, conf->min, conf->max);
return false;
}
}
else
{
newval = conf->reset_val;
source = conf->gen.reset_source;
}
if (conf->assign_hook)
if (!(*conf->assign_hook) (newval, DoIt, interactive))
{
elog(elevel, "invalid value for option '%s': %g",
name, newval);
return false;
}
if (DoIt || makeDefault)
{
if (DoIt)
{
*conf->variable = newval;
conf->gen.source = source;
}
if (makeDefault)
{
if (conf->gen.reset_source <= source)
{
conf->reset_val = newval;
conf->gen.reset_source = source;
}
if (conf->gen.session_source <= source)
{
conf->session_val = newval;
conf->gen.session_source = source;
}
}
else if (isLocal)
{
conf->gen.status |= GUC_HAVE_LOCAL;
guc_dirty = true;
}
else
{
conf->tentative_val = newval;
conf->gen.tentative_source = source;
conf->gen.status |= GUC_HAVE_TENTATIVE;
guc_dirty = true;
}
}
break;
}
case PGC_STRING:
{
struct config_string *conf = (struct config_string *) record;
char *newval;
if (value)
{
newval = strdup(value);
if (newval == NULL)
{
elog(elevel, "out of memory");
return false;
}
}
else if (conf->reset_val)
{
/*
* We could possibly avoid strdup here, but easier to
* make this case work the same as the normal
* assignment case.
*/
newval = strdup(conf->reset_val);
if (newval == NULL)
{
elog(elevel, "out of memory");
return false;
}
source = conf->gen.reset_source;
}
else
{
/* Nothing to reset to, as yet; so do nothing */
break;
}
/*
* Remember string in workspace, so that we can free it
* and avoid a permanent memory leak if hook elogs.
*/
if (guc_string_workspace)
free(guc_string_workspace);
guc_string_workspace = newval;
if (conf->assign_hook)
{
const char *hookresult;
hookresult = (*conf->assign_hook) (newval,
DoIt, interactive);
guc_string_workspace = NULL;
if (hookresult == NULL)
{
free(newval);
elog(elevel, "invalid value for option '%s': '%s'",
name, value ? value : "");
return false;
}
else if (hookresult != newval)
{
free(newval);
/*
* Having to cast away const here is annoying, but
* the alternative is to declare assign_hooks as
* returning char*, which would mean they'd have
* to cast away const, or as both taking and
* returning char*, which doesn't seem attractive
* either --- we don't want them to scribble on
* the passed str.
*/
newval = (char *) hookresult;
}
}
guc_string_workspace = NULL;
if (DoIt || makeDefault)
{
if (DoIt)
{
SET_STRING_VARIABLE(conf, newval);
conf->gen.source = source;
}
if (makeDefault)
{
if (conf->gen.reset_source <= source)
{
SET_STRING_RESET_VAL(conf, newval);
conf->gen.reset_source = source;
}
if (conf->gen.session_source <= source)
{
SET_STRING_SESSION_VAL(conf, newval);
conf->gen.session_source = source;
}
/* Perhaps we didn't install newval anywhere */
if (newval != *conf->variable &&
newval != conf->session_val &&
newval != conf->reset_val)
free(newval);
}
else if (isLocal)
{
conf->gen.status |= GUC_HAVE_LOCAL;
guc_dirty = true;
}
else
{
SET_STRING_TENTATIVE_VAL(conf, newval);
conf->gen.tentative_source = source;
conf->gen.status |= GUC_HAVE_TENTATIVE;
guc_dirty = true;
}
}
else
free(newval);
break;
}
}
return true;
}
/*
* Set a config option to the given value. See also set_config_option,
* this is just the wrapper to be called from outside GUC. NB: this
* is used only for non-transactional operations.
*/
void
SetConfigOption(const char *name, const char *value,
GucContext context, GucSource source)
{
(void) set_config_option(name, value, context, source, false, true);
}
/*
* Fetch the current value of the option `name'. If the option doesn't exist,
* throw an elog and don't return.
*
* The string is *not* allocated for modification and is really only
* valid until the next call to configuration related functions.
*/
const char *
GetConfigOption(const char *name)
{
struct config_generic *record;
static char buffer[256];
record = find_option(name);
if (record == NULL)
elog(ERROR, "Option '%s' is not recognized", name);
switch (record->vartype)
{
case PGC_BOOL:
return *((struct config_bool *) record)->variable ? "on" : "off";
case PGC_INT:
snprintf(buffer, sizeof(buffer), "%d",
*((struct config_int *) record)->variable);
return buffer;
case PGC_REAL:
snprintf(buffer, sizeof(buffer), "%g",
*((struct config_real *) record)->variable);
return buffer;
case PGC_STRING:
return *((struct config_string *) record)->variable;
}
return NULL;
}
/*
* Get the RESET value associated with the given option.
*/
const char *
GetConfigOptionResetString(const char *name)
{
struct config_generic *record;
static char buffer[256];
record = find_option(name);
if (record == NULL)
elog(ERROR, "Option '%s' is not recognized", name);
switch (record->vartype)
{
case PGC_BOOL:
return ((struct config_bool *) record)->reset_val ? "on" : "off";
case PGC_INT:
snprintf(buffer, sizeof(buffer), "%d",
((struct config_int *) record)->reset_val);
return buffer;
case PGC_REAL:
snprintf(buffer, sizeof(buffer), "%g",
((struct config_real *) record)->reset_val);
return buffer;
case PGC_STRING:
return ((struct config_string *) record)->reset_val;
}
return NULL;
}
/*
* flatten_set_variable_args
* Given a parsenode List as emitted by the grammar for SET,
* convert to the flat string representation used by GUC.
*
* We need to be told the name of the variable the args are for, because
* the flattening rules vary (ugh).
*
* The result is NULL if input is NIL (ie, SET ... TO DEFAULT), otherwise
* a palloc'd string.
*/
char *
flatten_set_variable_args(const char *name, List *args)
{
struct config_generic *record;
int flags;
StringInfoData buf;
List *l;
/*
* Fast path if just DEFAULT. We do not check the variable name in
* this case --- necessary for RESET ALL to work correctly.
*/
if (args == NIL)
return NULL;
/* Else get flags for the variable */
record = find_option(name);
if (record == NULL)
elog(ERROR, "'%s' is not a valid option name", name);
flags = record->flags;
/* Complain if list input and non-list variable */
if ((flags & GUC_LIST_INPUT) == 0 &&
lnext(args) != NIL)
elog(ERROR, "SET %s takes only one argument", name);
initStringInfo(&buf);
foreach(l, args)
{
A_Const *arg = (A_Const *) lfirst(l);
char *val;
if (l != args)
appendStringInfo(&buf, ", ");
if (!IsA(arg, A_Const))
elog(ERROR, "flatten_set_variable_args: unexpected input");
switch (nodeTag(&arg->val))
{
case T_Integer:
appendStringInfo(&buf, "%ld", intVal(&arg->val));
break;
case T_Float:
/* represented as a string, so just copy it */
appendStringInfo(&buf, "%s", strVal(&arg->val));
break;
case T_String:
val = strVal(&arg->val);
if (arg->typename != NULL)
{
/*
* Must be a ConstInterval argument for TIME ZONE.
* Coerce to interval and back to normalize the value
* and account for any typmod.
*/
Datum interval;
char *intervalout;
interval =
DirectFunctionCall3(interval_in,
CStringGetDatum(val),
ObjectIdGetDatum(InvalidOid),
Int32GetDatum(arg->typename->typmod));
intervalout =
DatumGetCString(DirectFunctionCall3(interval_out,
interval,
ObjectIdGetDatum(InvalidOid),
Int32GetDatum(-1)));
appendStringInfo(&buf, "INTERVAL '%s'", intervalout);
}
else
{
/*
* Plain string literal or identifier. For quote
* mode, quote it if it's not a vanilla identifier.
*/
if (flags & GUC_LIST_QUOTE)
appendStringInfo(&buf, "%s", quote_identifier(val));
else
appendStringInfo(&buf, "%s", val);
}
break;
default:
elog(ERROR, "flatten_set_variable_args: unexpected input");
break;
}
}
return buf.data;
}
/*
* SET command
*/
void
SetPGVariable(const char *name, List *args, bool is_local)
{
char *argstring = flatten_set_variable_args(name, args);
/* Note SET DEFAULT (argstring == NULL) is equivalent to RESET */
set_config_option(name,
argstring,
(superuser() ? PGC_SUSET : PGC_USERSET),
PGC_S_SESSION,
is_local,
true);
}
/*
* SET command wrapped as a SQL callable function.
*/
Datum
set_config_by_name(PG_FUNCTION_ARGS)
{
char *name;
char *value;
char *new_value;
bool is_local;
text *result_text;
if (PG_ARGISNULL(0))
elog(ERROR, "SET variable name is required");
/* Get the GUC variable name */
name = DatumGetCString(DirectFunctionCall1(textout, PG_GETARG_DATUM(0)));
/* Get the desired value or set to NULL for a reset request */
if (PG_ARGISNULL(1))
value = NULL;
else
value = DatumGetCString(DirectFunctionCall1(textout, PG_GETARG_DATUM(1)));
/*
* Get the desired state of is_local. Default to false if provided
* value is NULL
*/
if (PG_ARGISNULL(2))
is_local = false;
else
is_local = PG_GETARG_BOOL(2);
/* Note SET DEFAULT (argstring == NULL) is equivalent to RESET */
set_config_option(name,
value,
(superuser() ? PGC_SUSET : PGC_USERSET),
PGC_S_SESSION,
is_local,
true);
/* get the new current value */
new_value = GetConfigOptionByName(name, NULL);
/* Convert return string to text */
result_text = DatumGetTextP(DirectFunctionCall1(textin, CStringGetDatum(new_value)));
/* return it */
PG_RETURN_TEXT_P(result_text);
}
/*
* SHOW command
*/
void
GetPGVariable(const char *name)
{
if (strcasecmp(name, "all") == 0)
ShowAllGUCConfig();
else
ShowGUCConfigOption(name);
}
/*
* RESET command
*/
void
ResetPGVariable(const char *name)
{
if (strcasecmp(name, "all") == 0)
ResetAllOptions();
else
set_config_option(name,
NULL,
(superuser() ? PGC_SUSET : PGC_USERSET),
PGC_S_SESSION,
false,
true);
}
/*
* SHOW command
*/
void
ShowGUCConfigOption(const char *name)
{
TupOutputState *tstate;
TupleDesc tupdesc;
CommandDest dest = whereToSendOutput;
const char *varname;
char *value;
/* Get the value and canonical spelling of name */
value = GetConfigOptionByName(name, &varname);
/* need a tuple descriptor representing a single TEXT column */
tupdesc = CreateTemplateTupleDesc(1, false);
TupleDescInitEntry(tupdesc, (AttrNumber) 1, (char *) varname,
TEXTOID, -1, 0, false);
/* prepare for projection of tuples */
tstate = begin_tup_output_tupdesc(dest, tupdesc);
/* Send it */
do_text_output_oneline(tstate, value);
end_tup_output(tstate);
}
/*
* SHOW ALL command
*/
void
ShowAllGUCConfig(void)
{
int i;
TupOutputState *tstate;
TupleDesc tupdesc;
CommandDest dest = whereToSendOutput;
char *values[2];
/* need a tuple descriptor representing two TEXT columns */
tupdesc = CreateTemplateTupleDesc(2, false);
TupleDescInitEntry(tupdesc, (AttrNumber) 1, "name",
TEXTOID, -1, 0, false);
TupleDescInitEntry(tupdesc, (AttrNumber) 2, "setting",
TEXTOID, -1, 0, false);
/* prepare for projection of tuples */
tstate = begin_tup_output_tupdesc(dest, tupdesc);
for (i = 0; i < num_guc_variables; i++)
{
struct config_generic *conf = guc_variables[i];
if (conf->flags & GUC_NO_SHOW_ALL)
continue;
/* assign to the values array */
values[0] = (char *) conf->name;
values[1] = _ShowOption(conf);
/* send it to dest */
do_tup_output(tstate, values);
/* clean up */
if (values[1] != NULL)
pfree(values[1]);
}
end_tup_output(tstate);
}
/*
* Return GUC variable value by name; optionally return canonical
* form of name. Return value is palloc'd.
*/
char *
GetConfigOptionByName(const char *name, const char **varname)
{
struct config_generic *record;
record = find_option(name);
if (record == NULL)
elog(ERROR, "Option '%s' is not recognized", name);
if (varname)
*varname = record->name;
return _ShowOption(record);
}
/*
* Return GUC variable value by variable number; optionally return canonical
* form of name. Return value is palloc'd.
*/
char *
GetConfigOptionByNum(int varnum, const char **varname, bool *noshow)
{
struct config_generic *conf;
/* check requested variable number valid */
Assert((varnum >= 0) && (varnum < num_guc_variables));
conf = guc_variables[varnum];
if (varname)
*varname = conf->name;
if (noshow)
*noshow = (conf->flags & GUC_NO_SHOW_ALL) ? true : false;
return _ShowOption(conf);
}
/*
* Return the total number of GUC variables
*/
int
GetNumConfigOptions(void)
{
return num_guc_variables;
}
/*
* show_config_by_name - equiv to SHOW X command but implemented as
* a function.
*/
Datum
show_config_by_name(PG_FUNCTION_ARGS)
{
char *varname;
char *varval;
text *result_text;
/* Get the GUC variable name */
varname = DatumGetCString(DirectFunctionCall1(textout, PG_GETARG_DATUM(0)));
/* Get the value */
varval = GetConfigOptionByName(varname, NULL);
/* Convert to text */
result_text = DatumGetTextP(DirectFunctionCall1(textin, CStringGetDatum(varval)));
/* return it */
PG_RETURN_TEXT_P(result_text);
}
/*
* show_all_settings - equiv to SHOW ALL command but implemented as
* a Table Function.
*/
Datum
show_all_settings(PG_FUNCTION_ARGS)
{
FuncCallContext *funcctx;
TupleDesc tupdesc;
int call_cntr;
int max_calls;
TupleTableSlot *slot;
AttInMetadata *attinmeta;
MemoryContext oldcontext;
/* stuff done only on the first call of the function */
if (SRF_IS_FIRSTCALL())
{
/* create a function context for cross-call persistence */
funcctx = SRF_FIRSTCALL_INIT();
/*
* switch to memory context appropriate for multiple function
* calls
*/
oldcontext = MemoryContextSwitchTo(funcctx->multi_call_memory_ctx);
/* need a tuple descriptor representing two TEXT columns */
tupdesc = CreateTemplateTupleDesc(2, false);
TupleDescInitEntry(tupdesc, (AttrNumber) 1, "name",
TEXTOID, -1, 0, false);
TupleDescInitEntry(tupdesc, (AttrNumber) 2, "setting",
TEXTOID, -1, 0, false);
/* allocate a slot for a tuple with this tupdesc */
slot = TupleDescGetSlot(tupdesc);
/* assign slot to function context */
funcctx->slot = slot;
/*
* Generate attribute metadata needed later to produce tuples from
* raw C strings
*/
attinmeta = TupleDescGetAttInMetadata(tupdesc);
funcctx->attinmeta = attinmeta;
/* total number of tuples to be returned */
funcctx->max_calls = GetNumConfigOptions();
MemoryContextSwitchTo(oldcontext);
}
/* stuff done on every call of the function */
funcctx = SRF_PERCALL_SETUP();
call_cntr = funcctx->call_cntr;
max_calls = funcctx->max_calls;
slot = funcctx->slot;
attinmeta = funcctx->attinmeta;
if (call_cntr < max_calls) /* do when there is more left to send */
{
char *values[2];
char *varname;
char *varval;
bool noshow;
HeapTuple tuple;
Datum result;
/*
* Get the next visible GUC variable name and value
*/
do
{
varval = GetConfigOptionByNum(call_cntr,
(const char **) &varname,
&noshow);
if (noshow)
{
/* varval is a palloc'd copy, so free it */
if (varval != NULL)
pfree(varval);
/* bump the counter and get the next config setting */
call_cntr = ++funcctx->call_cntr;
/* make sure we haven't gone too far now */
if (call_cntr >= max_calls)
SRF_RETURN_DONE(funcctx);
}
} while (noshow);
/*
* Prepare a values array for storage in our slot. This should be
* an array of C strings which will be processed later by the
* appropriate "in" functions.
*/
values[0] = varname;
values[1] = varval;
/* build a tuple */
tuple = BuildTupleFromCStrings(attinmeta, values);
/* make the tuple into a datum */
result = TupleGetDatum(slot, tuple);
/* Clean up */
if (varval != NULL)
pfree(varval);
SRF_RETURN_NEXT(funcctx, result);
}
else
/* do when there is no more left */
SRF_RETURN_DONE(funcctx);
}
static char *
_ShowOption(struct config_generic * record)
{
char buffer[256];
const char *val;
switch (record->vartype)
{
case PGC_BOOL:
{
struct config_bool *conf = (struct config_bool *) record;
if (conf->show_hook)
val = (*conf->show_hook) ();
else
val = *conf->variable ? "on" : "off";
}
break;
case PGC_INT:
{
struct config_int *conf = (struct config_int *) record;
if (conf->show_hook)
val = (*conf->show_hook) ();
else
{
snprintf(buffer, sizeof(buffer), "%d",
*conf->variable);
val = buffer;
}
}
break;
case PGC_REAL:
{
struct config_real *conf = (struct config_real *) record;
if (conf->show_hook)
val = (*conf->show_hook) ();
else
{
snprintf(buffer, sizeof(buffer), "%g",
*conf->variable);
val = buffer;
}
}
break;
case PGC_STRING:
{
struct config_string *conf = (struct config_string *) record;
if (conf->show_hook)
val = (*conf->show_hook) ();
else if (*conf->variable && **conf->variable)
val = *conf->variable;
else
val = "unset";
}
break;
default:
/* just to keep compiler quiet */
val = "???";
break;
}
return pstrdup(val);
}
/*
* A little "long argument" simulation, although not quite GNU
* compliant. Takes a string of the form "some-option=some value" and
* returns name = "some_option" and value = "some value" in malloc'ed
* storage. Note that '-' is converted to '_' in the option name. If
* there is no '=' in the input string then value will be NULL.
*/
void
ParseLongOption(const char *string, char **name, char **value)
{
size_t equal_pos;
char *cp;
AssertArg(string);
AssertArg(name);
AssertArg(value);
equal_pos = strcspn(string, "=");
if (string[equal_pos] == '=')
{
*name = malloc(equal_pos + 1);
if (!*name)
elog(FATAL, "out of memory");
strncpy(*name, string, equal_pos);
(*name)[equal_pos] = '\0';
*value = strdup(&string[equal_pos + 1]);
if (!*value)
elog(FATAL, "out of memory");
}
else
{
/* no equal sign in string */
*name = strdup(string);
if (!*name)
elog(FATAL, "out of memory");
*value = NULL;
}
for (cp = *name; *cp; cp++)
if (*cp == '-')
*cp = '_';
}
#ifdef HAVE_SYSLOG
static const char *
assign_facility(const char *facility, bool doit, bool interactive)
{
if (strcasecmp(facility, "LOCAL0") == 0)
return facility;
if (strcasecmp(facility, "LOCAL1") == 0)
return facility;
if (strcasecmp(facility, "LOCAL2") == 0)
return facility;
if (strcasecmp(facility, "LOCAL3") == 0)
return facility;
if (strcasecmp(facility, "LOCAL4") == 0)
return facility;
if (strcasecmp(facility, "LOCAL5") == 0)
return facility;
if (strcasecmp(facility, "LOCAL6") == 0)
return facility;
if (strcasecmp(facility, "LOCAL7") == 0)
return facility;
return NULL;
}
#endif
static const char *
assign_defaultxactisolevel(const char *newval, bool doit, bool interactive)
{
if (strcasecmp(newval, "serializable") == 0)
{
if (doit)
DefaultXactIsoLevel = XACT_SERIALIZABLE;
}
else if (strcasecmp(newval, "read committed") == 0)
{
if (doit)
DefaultXactIsoLevel = XACT_READ_COMMITTED;
}
else
return NULL;
return newval;
}
/*
* Handle options fetched from pg_database.datconfig or pg_shadow.useconfig.
* The array parameter must be an array of TEXT (it must not be NULL).
*/
void
ProcessGUCArray(ArrayType *array, GucSource source)
{
int i;
Assert(array != NULL);
Assert(ARR_ELEMTYPE(array) == TEXTOID);
Assert(ARR_NDIM(array) == 1);
Assert(ARR_LBOUND(array)[0] == 1);
Assert(source == PGC_S_DATABASE || source == PGC_S_USER);
for (i = 1; i <= ARR_DIMS(array)[0]; i++)
{
Datum d;
bool isnull;
char *s;
char *name;
char *value;
d = array_ref(array, 1, &i,
-1 /* varlenarray */ ,
-1 /* TEXT's typlen */ ,
false /* TEXT's typbyval */ ,
'i' /* TEXT's typalign */ ,
&isnull);
if (isnull)
continue;
s = DatumGetCString(DirectFunctionCall1(textout, d));
ParseLongOption(s, &name, &value);
if (!value)
{
elog(WARNING, "cannot parse setting \"%s\"", name);
free(name);
continue;
}
/*
* We process all these options at SUSET level. We assume that
* the right to insert an option into pg_database or pg_shadow was
* checked when it was inserted.
*/
SetConfigOption(name, value, PGC_SUSET, source);
free(name);
if (value)
free(value);
}
}
/*
* Add an entry to an option array. The array parameter may be NULL
* to indicate the current table entry is NULL.
*/
ArrayType *
GUCArrayAdd(ArrayType *array, const char *name, const char *value)
{
Datum datum;
char *newval;
ArrayType *a;
Assert(name);
Assert(value);
/* test if the option is valid */
set_config_option(name, value,
superuser() ? PGC_SUSET : PGC_USERSET,
PGC_S_SESSION, false, false);
newval = palloc(strlen(name) + 1 + strlen(value) + 1);
sprintf(newval, "%s=%s", name, value);
datum = DirectFunctionCall1(textin, CStringGetDatum(newval));
if (array)
{
int index;
bool isnull;
int i;
Assert(ARR_ELEMTYPE(array) == TEXTOID);
Assert(ARR_NDIM(array) == 1);
Assert(ARR_LBOUND(array)[0] == 1);
index = ARR_DIMS(array)[0] + 1; /* add after end */
for (i = 1; i <= ARR_DIMS(array)[0]; i++)
{
Datum d;
char *current;
d = array_ref(array, 1, &i,
-1 /* varlenarray */ ,
-1 /* TEXT's typlen */ ,
false /* TEXT's typbyval */ ,
'i' /* TEXT's typalign */ ,
&isnull);
if (isnull)
continue;
current = DatumGetCString(DirectFunctionCall1(textout, d));
if (strncmp(current, newval, strlen(name) + 1) == 0)
{
index = i;
break;
}
}
isnull = false;
a = array_set(array, 1, &index,
datum,
-1 /* varlenarray */ ,
-1 /* TEXT's typlen */ ,
false /* TEXT's typbyval */ ,
'i' /* TEXT's typalign */ ,
&isnull);
}
else
a = construct_array(&datum, 1,
TEXTOID,
-1, false, 'i');
return a;
}
/*
* Delete an entry from an option array. The array parameter may be NULL
* to indicate the current table entry is NULL. Also, if the return value
* is NULL then a null should be stored.
*/
ArrayType *
GUCArrayDelete(ArrayType *array, const char *name)
{
ArrayType *newarray;
int i;
int index;
Assert(name);
/* test if the option is valid */
set_config_option(name, NULL,
superuser() ? PGC_SUSET : PGC_USERSET,
PGC_S_SESSION, false, false);
/* if array is currently null, then surely nothing to delete */
if (!array)
return NULL;
newarray = NULL;
index = 1;
for (i = 1; i <= ARR_DIMS(array)[0]; i++)
{
Datum d;
char *val;
bool isnull;
d = array_ref(array, 1, &i,
-1 /* varlenarray */ ,
-1 /* TEXT's typlen */ ,
false /* TEXT's typbyval */ ,
'i' /* TEXT's typalign */ ,
&isnull);
if (isnull)
continue;
val = DatumGetCString(DirectFunctionCall1(textout, d));
/* ignore entry if it's what we want to delete */
if (strncmp(val, name, strlen(name)) == 0
&& val[strlen(name)] == '=')
continue;
/* else add it to the output array */
if (newarray)
{
isnull = false;
newarray = array_set(newarray, 1, &index,
d,
-1 /* varlenarray */ ,
-1 /* TEXT's typlen */ ,
false /* TEXT's typbyval */ ,
'i' /* TEXT's typalign */ ,
&isnull);
}
else
newarray = construct_array(&d, 1,
TEXTOID,
-1, false, 'i');
index++;
}
return newarray;
}
const char *
assign_log_min_messages(const char *newval,
bool doit, bool interactive)
{
return (assign_msglvl(&log_min_messages, newval, doit, interactive));
}
const char *
assign_client_min_messages(const char *newval,
bool doit, bool interactive)
{
return (assign_msglvl(&client_min_messages, newval, doit, interactive));
}
const char *
assign_min_error_statement(const char *newval, bool doit, bool interactive)
{
return (assign_msglvl(&log_min_error_statement, newval, doit, interactive));
}
static const char *
assign_msglvl(int *var, const char *newval, bool doit, bool interactive)
{
if (strcasecmp(newval, "debug") == 0)
{
if (doit)
(*var) = DEBUG1;
}
else if (strcasecmp(newval, "debug5") == 0)
{
if (doit)
(*var) = DEBUG5;
}
else if (strcasecmp(newval, "debug4") == 0)
{
if (doit)
(*var) = DEBUG4;
}
else if (strcasecmp(newval, "debug3") == 0)
{
if (doit)
(*var) = DEBUG3;
}
else if (strcasecmp(newval, "debug2") == 0)
{
if (doit)
(*var) = DEBUG2;
}
else if (strcasecmp(newval, "debug1") == 0)
{
if (doit)
(*var) = DEBUG1;
}
else if (strcasecmp(newval, "log") == 0)
{
if (doit)
(*var) = LOG;
}
else if (strcasecmp(newval, "info") == 0)
{
if (doit)
(*var) = INFO;
}
else if (strcasecmp(newval, "notice") == 0)
{
if (doit)
(*var) = NOTICE;
}
else if (strcasecmp(newval, "warning") == 0)
{
if (doit)
(*var) = WARNING;
}
else if (strcasecmp(newval, "error") == 0)
{
if (doit)
(*var) = ERROR;
}
/* We allow FATAL/PANIC for client-side messages too. */
else if (strcasecmp(newval, "fatal") == 0)
{
if (doit)
(*var) = FATAL;
}
else if (strcasecmp(newval, "panic") == 0)
{
if (doit)
(*var) = PANIC;
}
else
return NULL; /* fail */
return newval; /* OK */
}
#include "guc-file.c"
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