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postgresql/src/backend/utils/misc/guc_funcs.c

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/*--------------------------------------------------------------------
*
* guc_funcs.c
*
* SQL commands and SQL-accessible functions related to GUC variables.
*
*
* Copyright (c) 2000-2023, PostgreSQL Global Development Group
* Written by Peter Eisentraut <peter_e@gmx.net>.
*
* IDENTIFICATION
* src/backend/utils/misc/guc_funcs.c
*
*--------------------------------------------------------------------
*/
#include "postgres.h"
#include <sys/stat.h>
#include <unistd.h>
#include "access/xact.h"
#include "catalog/objectaccess.h"
#include "catalog/pg_authid.h"
#include "catalog/pg_parameter_acl.h"
#include "funcapi.h"
#include "guc_internal.h"
#include "parser/parse_type.h"
#include "utils/acl.h"
#include "utils/backend_status.h"
#include "utils/builtins.h"
#include "utils/guc_tables.h"
#include "utils/snapmgr.h"
static char *flatten_set_variable_args(const char *name, List *args);
static void ShowGUCConfigOption(const char *name, DestReceiver *dest);
static void ShowAllGUCConfig(DestReceiver *dest);
/*
* SET command
*/
void
ExecSetVariableStmt(VariableSetStmt *stmt, bool isTopLevel)
{
GucAction action = stmt->is_local ? GUC_ACTION_LOCAL : GUC_ACTION_SET;
/*
* Workers synchronize these parameters at the start of the parallel
* operation; then, we block SET during the operation.
*/
if (IsInParallelMode())
ereport(ERROR,
(errcode(ERRCODE_INVALID_TRANSACTION_STATE),
errmsg("cannot set parameters during a parallel operation")));
switch (stmt->kind)
{
case VAR_SET_VALUE:
case VAR_SET_CURRENT:
if (stmt->is_local)
WarnNoTransactionBlock(isTopLevel, "SET LOCAL");
(void) set_config_option(stmt->name,
ExtractSetVariableArgs(stmt),
(superuser() ? PGC_SUSET : PGC_USERSET),
PGC_S_SESSION,
action, true, 0, false);
break;
case VAR_SET_MULTI:
/*
* Special-case SQL syntaxes. The TRANSACTION and SESSION
* CHARACTERISTICS cases effectively set more than one variable
* per statement. TRANSACTION SNAPSHOT only takes one argument,
* but we put it here anyway since it's a special case and not
* related to any GUC variable.
*/
if (strcmp(stmt->name, "TRANSACTION") == 0)
{
ListCell *head;
WarnNoTransactionBlock(isTopLevel, "SET TRANSACTION");
foreach(head, stmt->args)
{
DefElem *item = (DefElem *) lfirst(head);
if (strcmp(item->defname, "transaction_isolation") == 0)
SetPGVariable("transaction_isolation",
list_make1(item->arg), stmt->is_local);
else if (strcmp(item->defname, "transaction_read_only") == 0)
SetPGVariable("transaction_read_only",
list_make1(item->arg), stmt->is_local);
else if (strcmp(item->defname, "transaction_deferrable") == 0)
SetPGVariable("transaction_deferrable",
list_make1(item->arg), stmt->is_local);
else
elog(ERROR, "unexpected SET TRANSACTION element: %s",
item->defname);
}
}
else if (strcmp(stmt->name, "SESSION CHARACTERISTICS") == 0)
{
ListCell *head;
foreach(head, stmt->args)
{
DefElem *item = (DefElem *) lfirst(head);
if (strcmp(item->defname, "transaction_isolation") == 0)
SetPGVariable("default_transaction_isolation",
list_make1(item->arg), stmt->is_local);
else if (strcmp(item->defname, "transaction_read_only") == 0)
SetPGVariable("default_transaction_read_only",
list_make1(item->arg), stmt->is_local);
else if (strcmp(item->defname, "transaction_deferrable") == 0)
SetPGVariable("default_transaction_deferrable",
list_make1(item->arg), stmt->is_local);
else
elog(ERROR, "unexpected SET SESSION element: %s",
item->defname);
}
}
else if (strcmp(stmt->name, "TRANSACTION SNAPSHOT") == 0)
{
A_Const *con = linitial_node(A_Const, stmt->args);
if (stmt->is_local)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("SET LOCAL TRANSACTION SNAPSHOT is not implemented")));
WarnNoTransactionBlock(isTopLevel, "SET TRANSACTION");
ImportSnapshot(strVal(&con->val));
}
else
elog(ERROR, "unexpected SET MULTI element: %s",
stmt->name);
break;
case VAR_SET_DEFAULT:
if (stmt->is_local)
WarnNoTransactionBlock(isTopLevel, "SET LOCAL");
/* fall through */
case VAR_RESET:
(void) set_config_option(stmt->name,
NULL,
(superuser() ? PGC_SUSET : PGC_USERSET),
PGC_S_SESSION,
action, true, 0, false);
break;
case VAR_RESET_ALL:
ResetAllOptions();
break;
}
/* Invoke the post-alter hook for setting this GUC variable, by name. */
InvokeObjectPostAlterHookArgStr(ParameterAclRelationId, stmt->name,
ACL_SET, stmt->kind, false);
}
/*
* Get the value to assign for a VariableSetStmt, or NULL if it's RESET.
* The result is palloc'd.
*
* This is exported for use by actions such as ALTER ROLE SET.
*/
char *
ExtractSetVariableArgs(VariableSetStmt *stmt)
{
switch (stmt->kind)
{
case VAR_SET_VALUE:
return flatten_set_variable_args(stmt->name, stmt->args);
case VAR_SET_CURRENT:
return GetConfigOptionByName(stmt->name, NULL, false);
default:
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 args is NIL (i.e., SET ... TO DEFAULT), otherwise
* a palloc'd string.
*/
static char *
flatten_set_variable_args(const char *name, List *args)
{
struct config_generic *record;
int flags;
StringInfoData buf;
ListCell *l;
/* Fast path if just DEFAULT */
if (args == NIL)
return NULL;
/*
* Get flags for the variable; if it's not known, use default flags.
* (Caller might throw error later, but not our business to do so here.)
*/
record = find_option(name, false, true, WARNING);
if (record)
flags = record->flags;
else
flags = 0;
/* Complain if list input and non-list variable */
if ((flags & GUC_LIST_INPUT) == 0 &&
list_length(args) != 1)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("SET %s takes only one argument", name)));
initStringInfo(&buf);
/*
* Each list member may be a plain A_Const node, or an A_Const within a
* TypeCast; the latter case is supported only for ConstInterval arguments
* (for SET TIME ZONE).
*/
foreach(l, args)
{
Node *arg = (Node *) lfirst(l);
char *val;
TypeName *typeName = NULL;
A_Const *con;
if (l != list_head(args))
appendStringInfoString(&buf, ", ");
if (IsA(arg, TypeCast))
{
TypeCast *tc = (TypeCast *) arg;
arg = tc->arg;
typeName = tc->typeName;
}
if (!IsA(arg, A_Const))
elog(ERROR, "unrecognized node type: %d", (int) nodeTag(arg));
con = (A_Const *) arg;
switch (nodeTag(&con->val))
{
case T_Integer:
appendStringInfo(&buf, "%d", intVal(&con->val));
break;
case T_Float:
/* represented as a string, so just copy it */
appendStringInfoString(&buf, castNode(Float, &con->val)->fval);
break;
case T_String:
val = strVal(&con->val);
if (typeName != NULL)
{
/*
* Must be a ConstInterval argument for TIME ZONE. Coerce
* to interval and back to normalize the value and account
* for any typmod.
*/
Oid typoid;
int32 typmod;
Datum interval;
char *intervalout;
typenameTypeIdAndMod(NULL, typeName, &typoid, &typmod);
Assert(typoid == INTERVALOID);
interval =
DirectFunctionCall3(interval_in,
CStringGetDatum(val),
ObjectIdGetDatum(InvalidOid),
Int32GetDatum(typmod));
intervalout =
DatumGetCString(DirectFunctionCall1(interval_out,
interval));
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)
appendStringInfoString(&buf, quote_identifier(val));
else
appendStringInfoString(&buf, val);
}
break;
default:
elog(ERROR, "unrecognized node type: %d",
(int) nodeTag(&con->val));
break;
}
}
return buf.data;
}
/*
* SetPGVariable - SET command exported as an easily-C-callable function.
*
* This provides access to SET TO value, as well as SET TO DEFAULT (expressed
* by passing args == NIL), but not SET FROM CURRENT functionality.
*/
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 */
(void) set_config_option(name,
argstring,
(superuser() ? PGC_SUSET : PGC_USERSET),
PGC_S_SESSION,
is_local ? GUC_ACTION_LOCAL : GUC_ACTION_SET,
true, 0, false);
}
/*
* 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;
if (PG_ARGISNULL(0))
ereport(ERROR,
(errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
errmsg("SET requires parameter name")));
/* Get the GUC variable name */
name = TextDatumGetCString(PG_GETARG_DATUM(0));
/* Get the desired value or set to NULL for a reset request */
if (PG_ARGISNULL(1))
value = NULL;
else
value = TextDatumGetCString(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 */
(void) set_config_option(name,
value,
(superuser() ? PGC_SUSET : PGC_USERSET),
PGC_S_SESSION,
is_local ? GUC_ACTION_LOCAL : GUC_ACTION_SET,
true, 0, false);
/* get the new current value */
new_value = GetConfigOptionByName(name, NULL, false);
/* Convert return string to text */
PG_RETURN_TEXT_P(cstring_to_text(new_value));
}
/*
* SHOW command
*/
void
GetPGVariable(const char *name, DestReceiver *dest)
{
if (guc_name_compare(name, "all") == 0)
ShowAllGUCConfig(dest);
else
ShowGUCConfigOption(name, dest);
}
/*
* Get a tuple descriptor for SHOW's result
*/
TupleDesc
GetPGVariableResultDesc(const char *name)
{
TupleDesc tupdesc;
if (guc_name_compare(name, "all") == 0)
{
/* need a tuple descriptor representing three TEXT columns */
tupdesc = CreateTemplateTupleDesc(3);
TupleDescInitEntry(tupdesc, (AttrNumber) 1, "name",
TEXTOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 2, "setting",
TEXTOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 3, "description",
TEXTOID, -1, 0);
}
else
{
const char *varname;
/* Get the canonical spelling of name */
(void) GetConfigOptionByName(name, &varname, false);
/* need a tuple descriptor representing a single TEXT column */
tupdesc = CreateTemplateTupleDesc(1);
TupleDescInitEntry(tupdesc, (AttrNumber) 1, varname,
TEXTOID, -1, 0);
}
return tupdesc;
}
/*
* SHOW one variable
*/
static void
ShowGUCConfigOption(const char *name, DestReceiver *dest)
{
TupOutputState *tstate;
TupleDesc tupdesc;
const char *varname;
char *value;
/* Get the value and canonical spelling of name */
value = GetConfigOptionByName(name, &varname, false);
/* need a tuple descriptor representing a single TEXT column */
tupdesc = CreateTemplateTupleDesc(1);
TupleDescInitBuiltinEntry(tupdesc, (AttrNumber) 1, varname,
TEXTOID, -1, 0);
/* prepare for projection of tuples */
tstate = begin_tup_output_tupdesc(dest, tupdesc, &TTSOpsVirtual);
/* Send it */
do_text_output_oneline(tstate, value);
end_tup_output(tstate);
}
/*
* SHOW ALL command
*/
static void
ShowAllGUCConfig(DestReceiver *dest)
{
struct config_generic **guc_vars;
int num_vars;
TupOutputState *tstate;
TupleDesc tupdesc;
Datum values[3];
bool isnull[3] = {false, false, false};
/* collect the variables, in sorted order */
guc_vars = get_guc_variables(&num_vars);
/* need a tuple descriptor representing three TEXT columns */
tupdesc = CreateTemplateTupleDesc(3);
TupleDescInitBuiltinEntry(tupdesc, (AttrNumber) 1, "name",
TEXTOID, -1, 0);
TupleDescInitBuiltinEntry(tupdesc, (AttrNumber) 2, "setting",
TEXTOID, -1, 0);
TupleDescInitBuiltinEntry(tupdesc, (AttrNumber) 3, "description",
TEXTOID, -1, 0);
/* prepare for projection of tuples */
tstate = begin_tup_output_tupdesc(dest, tupdesc, &TTSOpsVirtual);
for (int i = 0; i < num_vars; i++)
{
struct config_generic *conf = guc_vars[i];
char *setting;
/* skip if marked NO_SHOW_ALL */
if (conf->flags & GUC_NO_SHOW_ALL)
continue;
/* return only options visible to the current user */
if (!ConfigOptionIsVisible(conf))
continue;
/* assign to the values array */
values[0] = PointerGetDatum(cstring_to_text(conf->name));
setting = ShowGUCOption(conf, true);
if (setting)
{
values[1] = PointerGetDatum(cstring_to_text(setting));
isnull[1] = false;
}
else
{
values[1] = PointerGetDatum(NULL);
isnull[1] = true;
}
if (conf->short_desc)
{
values[2] = PointerGetDatum(cstring_to_text(conf->short_desc));
isnull[2] = false;
}
else
{
values[2] = PointerGetDatum(NULL);
isnull[2] = true;
}
/* send it to dest */
do_tup_output(tstate, values, isnull);
/* clean up */
pfree(DatumGetPointer(values[0]));
if (setting)
{
pfree(setting);
pfree(DatumGetPointer(values[1]));
}
if (conf->short_desc)
pfree(DatumGetPointer(values[2]));
}
end_tup_output(tstate);
}
/*
* Return some of the flags associated to the specified GUC in the shape of
* a text array, and NULL if it does not exist. An empty array is returned
* if the GUC exists without any meaningful flags to show.
*/
Datum
pg_settings_get_flags(PG_FUNCTION_ARGS)
{
#define MAX_GUC_FLAGS 6
char *varname = TextDatumGetCString(PG_GETARG_DATUM(0));
struct config_generic *record;
int cnt = 0;
Datum flags[MAX_GUC_FLAGS];
ArrayType *a;
record = find_option(varname, false, true, ERROR);
/* return NULL if no such variable */
if (record == NULL)
PG_RETURN_NULL();
if (record->flags & GUC_EXPLAIN)
flags[cnt++] = CStringGetTextDatum("EXPLAIN");
if (record->flags & GUC_NO_RESET)
flags[cnt++] = CStringGetTextDatum("NO_RESET");
if (record->flags & GUC_NO_RESET_ALL)
flags[cnt++] = CStringGetTextDatum("NO_RESET_ALL");
if (record->flags & GUC_NO_SHOW_ALL)
flags[cnt++] = CStringGetTextDatum("NO_SHOW_ALL");
if (record->flags & GUC_NOT_IN_SAMPLE)
flags[cnt++] = CStringGetTextDatum("NOT_IN_SAMPLE");
if (record->flags & GUC_RUNTIME_COMPUTED)
flags[cnt++] = CStringGetTextDatum("RUNTIME_COMPUTED");
Assert(cnt <= MAX_GUC_FLAGS);
/* Returns the record as Datum */
a = construct_array_builtin(flags, cnt, TEXTOID);
PG_RETURN_ARRAYTYPE_P(a);
}
/*
* Return whether or not the GUC variable is visible to the current user.
*/
bool
ConfigOptionIsVisible(struct config_generic *conf)
{
if ((conf->flags & GUC_SUPERUSER_ONLY) &&
!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_SETTINGS))
return false;
else
return true;
}
/*
* Extract fields to show in pg_settings for given variable.
*/
static void
GetConfigOptionValues(struct config_generic *conf, const char **values)
{
char buffer[256];
/* first get the generic attributes */
/* name */
values[0] = conf->name;
/* setting: use ShowGUCOption in order to avoid duplicating the logic */
values[1] = ShowGUCOption(conf, false);
/* unit, if any (NULL is fine) */
values[2] = get_config_unit_name(conf->flags);
/* group */
values[3] = _(config_group_names[conf->group]);
/* short_desc */
values[4] = conf->short_desc != NULL ? _(conf->short_desc) : NULL;
/* extra_desc */
values[5] = conf->long_desc != NULL ? _(conf->long_desc) : NULL;
/* context */
values[6] = GucContext_Names[conf->context];
/* vartype */
values[7] = config_type_names[conf->vartype];
/* source */
values[8] = GucSource_Names[conf->source];
/* now get the type specific attributes */
switch (conf->vartype)
{
case PGC_BOOL:
{
struct config_bool *lconf = (struct config_bool *) conf;
/* min_val */
values[9] = NULL;
/* max_val */
values[10] = NULL;
/* enumvals */
values[11] = NULL;
/* boot_val */
values[12] = pstrdup(lconf->boot_val ? "on" : "off");
/* reset_val */
values[13] = pstrdup(lconf->reset_val ? "on" : "off");
}
break;
case PGC_INT:
{
struct config_int *lconf = (struct config_int *) conf;
/* min_val */
snprintf(buffer, sizeof(buffer), "%d", lconf->min);
values[9] = pstrdup(buffer);
/* max_val */
snprintf(buffer, sizeof(buffer), "%d", lconf->max);
values[10] = pstrdup(buffer);
/* enumvals */
values[11] = NULL;
/* boot_val */
snprintf(buffer, sizeof(buffer), "%d", lconf->boot_val);
values[12] = pstrdup(buffer);
/* reset_val */
snprintf(buffer, sizeof(buffer), "%d", lconf->reset_val);
values[13] = pstrdup(buffer);
}
break;
case PGC_REAL:
{
struct config_real *lconf = (struct config_real *) conf;
/* min_val */
snprintf(buffer, sizeof(buffer), "%g", lconf->min);
values[9] = pstrdup(buffer);
/* max_val */
snprintf(buffer, sizeof(buffer), "%g", lconf->max);
values[10] = pstrdup(buffer);
/* enumvals */
values[11] = NULL;
/* boot_val */
snprintf(buffer, sizeof(buffer), "%g", lconf->boot_val);
values[12] = pstrdup(buffer);
/* reset_val */
snprintf(buffer, sizeof(buffer), "%g", lconf->reset_val);
values[13] = pstrdup(buffer);
}
break;
case PGC_STRING:
{
struct config_string *lconf = (struct config_string *) conf;
/* min_val */
values[9] = NULL;
/* max_val */
values[10] = NULL;
/* enumvals */
values[11] = NULL;
/* boot_val */
if (lconf->boot_val == NULL)
values[12] = NULL;
else
values[12] = pstrdup(lconf->boot_val);
/* reset_val */
if (lconf->reset_val == NULL)
values[13] = NULL;
else
values[13] = pstrdup(lconf->reset_val);
}
break;
case PGC_ENUM:
{
struct config_enum *lconf = (struct config_enum *) conf;
/* min_val */
values[9] = NULL;
/* max_val */
values[10] = NULL;
/* enumvals */
/*
* NOTE! enumvals with double quotes in them are not
* supported!
*/
values[11] = config_enum_get_options((struct config_enum *) conf,
"{\"", "\"}", "\",\"");
/* boot_val */
values[12] = pstrdup(config_enum_lookup_by_value(lconf,
lconf->boot_val));
/* reset_val */
values[13] = pstrdup(config_enum_lookup_by_value(lconf,
lconf->reset_val));
}
break;
default:
{
/*
* should never get here, but in case we do, set 'em to NULL
*/
/* min_val */
values[9] = NULL;
/* max_val */
values[10] = NULL;
/* enumvals */
values[11] = NULL;
/* boot_val */
values[12] = NULL;
/* reset_val */
values[13] = NULL;
}
break;
}
/*
* If the setting came from a config file, set the source location. For
* security reasons, we don't show source file/line number for
* insufficiently-privileged users.
*/
if (conf->source == PGC_S_FILE &&
has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_SETTINGS))
{
values[14] = conf->sourcefile;
snprintf(buffer, sizeof(buffer), "%d", conf->sourceline);
values[15] = pstrdup(buffer);
}
else
{
values[14] = NULL;
values[15] = NULL;
}
values[16] = (conf->status & GUC_PENDING_RESTART) ? "t" : "f";
}
/*
* show_config_by_name - equiv to SHOW X command but implemented as
* a function.
*/
Datum
show_config_by_name(PG_FUNCTION_ARGS)
{
char *varname = TextDatumGetCString(PG_GETARG_DATUM(0));
char *varval;
/* Get the value */
varval = GetConfigOptionByName(varname, NULL, false);
/* Convert to text */
PG_RETURN_TEXT_P(cstring_to_text(varval));
}
/*
* show_config_by_name_missing_ok - equiv to SHOW X command but implemented as
* a function. If X does not exist, suppress the error and just return NULL
* if missing_ok is true.
*/
Datum
show_config_by_name_missing_ok(PG_FUNCTION_ARGS)
{
char *varname = TextDatumGetCString(PG_GETARG_DATUM(0));
bool missing_ok = PG_GETARG_BOOL(1);
char *varval;
/* Get the value */
varval = GetConfigOptionByName(varname, NULL, missing_ok);
/* return NULL if no such variable */
if (varval == NULL)
PG_RETURN_NULL();
/* Convert to text */
PG_RETURN_TEXT_P(cstring_to_text(varval));
}
/*
* show_all_settings - equiv to SHOW ALL command but implemented as
* a Table Function.
*/
#define NUM_PG_SETTINGS_ATTS 17
Datum
show_all_settings(PG_FUNCTION_ARGS)
{
FuncCallContext *funcctx;
struct config_generic **guc_vars;
int num_vars;
TupleDesc tupdesc;
int call_cntr;
int max_calls;
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 NUM_PG_SETTINGS_ATTS columns
* of the appropriate types
*/
tupdesc = CreateTemplateTupleDesc(NUM_PG_SETTINGS_ATTS);
TupleDescInitEntry(tupdesc, (AttrNumber) 1, "name",
TEXTOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 2, "setting",
TEXTOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 3, "unit",
TEXTOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 4, "category",
TEXTOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 5, "short_desc",
TEXTOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 6, "extra_desc",
TEXTOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 7, "context",
TEXTOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 8, "vartype",
TEXTOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 9, "source",
TEXTOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 10, "min_val",
TEXTOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 11, "max_val",
TEXTOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 12, "enumvals",
TEXTARRAYOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 13, "boot_val",
TEXTOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 14, "reset_val",
TEXTOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 15, "sourcefile",
TEXTOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 16, "sourceline",
INT4OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 17, "pending_restart",
BOOLOID, -1, 0);
/*
* Generate attribute metadata needed later to produce tuples from raw
* C strings
*/
attinmeta = TupleDescGetAttInMetadata(tupdesc);
funcctx->attinmeta = attinmeta;
/* collect the variables, in sorted order */
guc_vars = get_guc_variables(&num_vars);
/* use user_fctx to remember the array location */
funcctx->user_fctx = guc_vars;
/* total number of tuples to be returned */
funcctx->max_calls = num_vars;
MemoryContextSwitchTo(oldcontext);
}
/* stuff done on every call of the function */
funcctx = SRF_PERCALL_SETUP();
guc_vars = (struct config_generic **) funcctx->user_fctx;
call_cntr = funcctx->call_cntr;
max_calls = funcctx->max_calls;
attinmeta = funcctx->attinmeta;
while (call_cntr < max_calls) /* do when there is more left to send */
{
struct config_generic *conf = guc_vars[call_cntr];
char *values[NUM_PG_SETTINGS_ATTS];
HeapTuple tuple;
Datum result;
/* skip if marked NO_SHOW_ALL or if not visible to current user */
if ((conf->flags & GUC_NO_SHOW_ALL) ||
!ConfigOptionIsVisible(conf))
{
call_cntr = ++funcctx->call_cntr;
continue;
}
/* extract values for the current variable */
GetConfigOptionValues(conf, (const char **) values);
/* build a tuple */
tuple = BuildTupleFromCStrings(attinmeta, values);
/* make the tuple into a datum */
result = HeapTupleGetDatum(tuple);
SRF_RETURN_NEXT(funcctx, result);
}
/* do when there is no more left */
SRF_RETURN_DONE(funcctx);
}
/*
* show_all_file_settings
*
* Returns a table of all parameter settings in all configuration files
* which includes the config file pathname, the line number, a sequence number
* indicating the order in which the settings were encountered, the parameter
* name and value, a bool showing if the value could be applied, and possibly
* an associated error message. (For problems such as syntax errors, the
* parameter name/value might be NULL.)
*
* Note: no filtering is done here, instead we depend on the GRANT system
* to prevent unprivileged users from accessing this function or the view
* built on top of it.
*/
Datum
show_all_file_settings(PG_FUNCTION_ARGS)
{
#define NUM_PG_FILE_SETTINGS_ATTS 7
ReturnSetInfo *rsinfo = (ReturnSetInfo *) fcinfo->resultinfo;
ConfigVariable *conf;
int seqno;
/* Scan the config files using current context as workspace */
conf = ProcessConfigFileInternal(PGC_SIGHUP, false, DEBUG3);
/* Build a tuplestore to return our results in */
InitMaterializedSRF(fcinfo, 0);
/* Process the results and create a tuplestore */
for (seqno = 1; conf != NULL; conf = conf->next, seqno++)
{
Datum values[NUM_PG_FILE_SETTINGS_ATTS];
bool nulls[NUM_PG_FILE_SETTINGS_ATTS];
memset(values, 0, sizeof(values));
memset(nulls, 0, sizeof(nulls));
/* sourcefile */
if (conf->filename)
values[0] = PointerGetDatum(cstring_to_text(conf->filename));
else
nulls[0] = true;
/* sourceline (not meaningful if no sourcefile) */
if (conf->filename)
values[1] = Int32GetDatum(conf->sourceline);
else
nulls[1] = true;
/* seqno */
values[2] = Int32GetDatum(seqno);
/* name */
if (conf->name)
values[3] = PointerGetDatum(cstring_to_text(conf->name));
else
nulls[3] = true;
/* setting */
if (conf->value)
values[4] = PointerGetDatum(cstring_to_text(conf->value));
else
nulls[4] = true;
/* applied */
values[5] = BoolGetDatum(conf->applied);
/* error */
if (conf->errmsg)
values[6] = PointerGetDatum(cstring_to_text(conf->errmsg));
else
nulls[6] = true;
/* shove row into tuplestore */
tuplestore_putvalues(rsinfo->setResult, rsinfo->setDesc, values, nulls);
}
return (Datum) 0;
}
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