*
* Copyright (c) 2000-2007, PostgreSQL Global Development Group
*
- * $PostgreSQL: pgsql/src/backend/utils/misc/guc-file.l,v 1.49 2007/03/13 14:32:25 petere Exp $
+ * $PostgreSQL: pgsql/src/backend/utils/misc/guc-file.l,v 1.50 2007/04/21 20:02:40 petere Exp $
*/
%{
{
int elevel;
struct name_value_pair *item, *head, *tail;
+ int i;
+ bool *in_conffile = NULL;
+ const char *var;
Assert(context == PGC_POSTMASTER || context == PGC_SIGHUP);
/* Check if all options are valid */
for (item = head; item; item = item->next)
{
+ char *sep = strchr(item->name, GUC_QUALIFIER_SEPARATOR);
+ if (sep && !is_custom_class(item->name, sep - item->name))
+ {
+ ereport(elevel,
+ (errcode(ERRCODE_UNDEFINED_OBJECT),
+ errmsg("unrecognized configuration parameter \"%s\"",
+ item->name)));
+ goto cleanup_list;
+ }
+
if (!set_config_option(item->name, item->value, context,
PGC_S_FILE, false, false))
goto cleanup_list;
}
- /* If we got here all the options checked out okay, so apply them. */
+
+ /*
+ * Mark all variables as not showing up in the config file. The
+ * allocation has to take place after ParseConfigFile() since this
+ * function can change num_guc_variables due to custom variables.
+ * It would be easier to add a new field or status bit to struct
+ * conf_generic, but that way we would expose internal information
+ * that is just needed here in the following few lines. The price
+ * to pay for this separation are a few more loops over the set of
+ * configuration options, but those are expected to be rather few
+ * and we only have to pay the cost at SIGHUP. We initialize
+ * in_conffile only here because set_config_option() makes
+ * guc_variables grow with custom variables.
+ */
+ in_conffile = guc_malloc(elevel, num_guc_variables * sizeof(bool));
+ if (!in_conffile)
+ goto cleanup_list;
+ for (i = 0; i < num_guc_variables; i++)
+ in_conffile[i] = false;
+
for (item = head; item; item = item->next)
{
+ /*
+ * After set_config_option() the variable name item->name is
+ * known to exist.
+ */
+ Assert(guc_get_index(item->name) >= 0);
+ in_conffile[guc_get_index(item->name)] = true;
+ }
+
+ for (i = 0; i < num_guc_variables; i++)
+ {
+ struct config_generic *gconf = guc_variables[i];
+ if (!in_conffile[i] && gconf->source == PGC_S_FILE)
+ {
+ if (gconf->context < PGC_SIGHUP)
+ ereport(elevel,
+ (errcode(ERRCODE_CANT_CHANGE_RUNTIME_PARAM),
+ errmsg("parameter \"%s\" cannot be changed after server start; configuration file change ignored",
+ gconf->name)));
+ else
+ {
+ /* prepare */
+ GucStack *stack;
+ if (gconf->reset_source == PGC_S_FILE)
+ gconf->reset_source = PGC_S_DEFAULT;
+ for (stack = gconf->stack; stack; stack = stack->prev)
+ if (stack->source == PGC_S_FILE)
+ stack->source = PGC_S_DEFAULT;
+ /* apply the default */
+ set_config_option(gconf->name, NULL, context,
+ PGC_S_DEFAULT, false, true);
+ }
+ }
+ else if (!in_conffile[i] && gconf->reset_source == PGC_S_FILE)
+ {
+ /*------
+ * Change the reset_val to default_val. Here's an
+ * example: In the configuration file we have
+ *
+ * seq_page_cost = 3.00
+ *
+ * Now we execute in a session
+ *
+ * SET seq_page_cost TO 4.00;
+ *
+ * Then we remove this option from the configuration file
+ * and send SIGHUP. Now when you execute
+ *
+ * RESET seq_page_cost;
+ *
+ * it should fall back to 1.00 (the default value for
+ * seq_page_cost) and not to 3.00 (which is the current
+ * reset_val).
+ */
+
+ switch (gconf->vartype)
+ {
+ case PGC_BOOL:
+ {
+ struct config_bool *conf;
+ conf = (struct config_bool *) gconf;
+ conf->reset_val = conf->boot_val;
+ break;
+ }
+ case PGC_INT:
+ {
+ struct config_int *conf;
+ conf = (struct config_int *) gconf;
+ conf->reset_val = conf->boot_val;
+ break;
+ }
+ case PGC_REAL:
+ {
+ struct config_real *conf;
+ conf = (struct config_real *) gconf;
+ conf->reset_val = conf->boot_val;
+ break;
+ }
+ case PGC_STRING:
+ {
+ struct config_string *conf;
+ conf = (struct config_string *) gconf;
+ /*
+ * We can cast away the const here because we
+ * won't free the address. It is protected by
+ * set_string_field() and string_field_used().
+ */
+ conf->reset_val = (char *) conf->boot_val;
+ break;
+ }
+ }
+ }
+ }
+
+ /* If we got here all the options checked out okay, so apply them. */
+ for (item = head; item; item = item->next)
set_config_option(item->name, item->value, context,
PGC_S_FILE, false, true);
- }
+
+ /*
+ * Reset variables to the value of environment variables
+ * (PGC_S_ENV_VAR overrules PGC_S_FILE). PGPORT is ignored,
+ * because it cannot be changed without restart.
+ */
+ var = getenv("PGDATESTYLE");
+ if (var != NULL)
+ set_config_option("datestyle", var, context,
+ PGC_S_ENV_VAR, false, true);
+
+ var = getenv("PGCLIENTENCODING");
+ if (var != NULL)
+ set_config_option("client_encoding", var, context,
+ PGC_S_ENV_VAR, false, true);
cleanup_list:
+ free(in_conffile);
free_name_value_list(head);
}
{
pfree(opt_name);
pfree(opt_value);
- /* we assume error message was logged already */
+
+ /* We assume the error message was logged already. */
OK = false;
goto cleanup_exit;
}
- pfree(opt_name);
- pfree(opt_value);
}
- else
+
+ if (pg_strcasecmp(opt_name, "include") != 0)
{
/* append to list */
struct name_value_pair *item;
* Written by Peter Eisentraut <peter_e@gmx.net>.
*
* IDENTIFICATION
- * $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.386 2007/04/18 16:44:18 alvherre Exp $
+ * $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.387 2007/04/21 20:02:40 petere Exp $
*
*--------------------------------------------------------------------
*/
if (oldval == NULL ||
oldval == *(conf->variable) ||
oldval == conf->reset_val ||
- oldval == conf->tentative_val)
+ oldval == conf->tentative_val ||
+ oldval == conf->boot_val)
return;
for (stack = conf->gen.stack; stack; stack = stack->prev)
{
if (strval == *(conf->variable) ||
strval == conf->reset_val ||
- strval == conf->tentative_val)
+ strval == conf->tentative_val ||
+ strval == conf->boot_val)
return true;
for (stack = conf->gen.stack; stack; stack = stack->prev)
{
return true;
}
+static int
+guc_get_index(const char *name)
+{
+ int i;
+
+ for (i = 0; i < num_guc_variables; i++)
+ if (strcasecmp(name, guc_variables[i]->name) == 0)
+ return i;
+
+ return -1;
+}
+
/*
* Create and add a placeholder variable. It's presumed to belong
* to a valid custom variable class at this point.
struct config_bool *conf = (struct config_bool *) gconf;
if (conf->assign_hook)
- if (!(*conf->assign_hook) (conf->reset_val, true,
+ if (!(*conf->assign_hook) (conf->boot_val, true,
PGC_S_DEFAULT))
elog(FATAL, "failed to initialize %s to %d",
- conf->gen.name, (int) conf->reset_val);
- *conf->variable = conf->reset_val;
+ conf->gen.name, (int) conf->boot_val);
+ *conf->variable = conf->reset_val = conf->boot_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);
+ Assert(conf->boot_val >= conf->min);
+ Assert(conf->boot_val <= conf->max);
if (conf->assign_hook)
- if (!(*conf->assign_hook) (conf->reset_val, true,
+ if (!(*conf->assign_hook) (conf->boot_val, true,
PGC_S_DEFAULT))
elog(FATAL, "failed to initialize %s to %d",
- conf->gen.name, conf->reset_val);
- *conf->variable = conf->reset_val;
+ conf->gen.name, conf->boot_val);
+ *conf->variable = conf->reset_val = conf->boot_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);
+ Assert(conf->boot_val >= conf->min);
+ Assert(conf->boot_val <= conf->max);
if (conf->assign_hook)
- if (!(*conf->assign_hook) (conf->reset_val, true,
+ if (!(*conf->assign_hook) (conf->boot_val, true,
PGC_S_DEFAULT))
elog(FATAL, "failed to initialize %s to %g",
- conf->gen.name, conf->reset_val);
- *conf->variable = conf->reset_val;
+ conf->gen.name, conf->boot_val);
+ *conf->variable = conf->reset_val = conf->boot_val;
break;
}
case PGC_STRING:
return false;
}
+ /*
+ * Do not replace a value that has been set on the command line by a SIGHUP
+ * reload
+ */
+ if (context == PGC_SIGHUP && record->source == PGC_S_ARGV)
+ return true;
+
/*
* 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
}
/*
- * Should we set reset/stacked values? (If so, the behavior is not
- * transactional.)
+ * Should we set reset/stacked values? (If so, the behavior is not
+ * transactional.) This is done either when we get a default
+ * value from the database's/user's/client's default settings or
+ * when we reset a value to its default.
*/
- makeDefault = changeVal && (source <= PGC_S_OVERRIDE) && (value != NULL);
+ makeDefault = changeVal && (source <= PGC_S_OVERRIDE)
+ && ((value != NULL) || source == PGC_S_DEFAULT);
/*
- * Ignore attempted set if overridden by previously processed setting.
- * However, if changeVal 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/stacked values even if we can't set the variable itself.
+ * Ignore attempted set if overridden by previously processed
+ * setting. However, if changeVal 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/stacked values even if
+ * we can't set the variable itself. There's one exception to
+ * this rule: if we want to apply the default value to variables
+ * that were removed from the configuration file. This is
+ * indicated by source == PGC_S_DEFAULT.
*/
- if (record->source > source)
+ if (record->source > source && source != PGC_S_DEFAULT)
{
if (changeVal && !makeDefault)
{
return false;
}
}
+ /*
+ * If value == NULL and source == PGC_S_DEFAULT then
+ * we reset some value to its default (removed from
+ * configuration file).
+ */
+ else if (source == PGC_S_DEFAULT)
+ newval = conf->boot_val;
+ /* else we handle a "RESET varname" command */
else
{
newval = conf->reset_val;
return false;
}
}
+ /*
+ * If value == NULL and source == PGC_S_DEFAULT then
+ * we reset some value to its default (removed from
+ * configuration file).
+ */
+ else if (source == PGC_S_DEFAULT)
+ newval = conf->boot_val;
+ /* else we handle a "RESET varname" command */
else
{
newval = conf->reset_val;
return false;
}
}
+ /*
+ * If value == NULL and source == PGC_S_DEFAULT then
+ * we reset some value to its default (removed from
+ * configuration file).
+ */
+ else if (source == PGC_S_DEFAULT)
+ newval = conf->boot_val;
+ /* else we handle a "RESET varname" command */
else
{
newval = conf->reset_val;
if (conf->gen.flags & GUC_IS_NAME)
truncate_identifier(newval, strlen(newval), true);
}
+ /*
+ * If value == NULL and source == PGC_S_DEFAULT then
+ * we reset some value to its default (removed from
+ * configuration file).
+ */
+ else if (source == PGC_S_DEFAULT)
+ {
+ if (conf->boot_val == NULL)
+ newval = NULL;
+ else
+ {
+ newval = guc_strdup(elevel, conf->boot_val);
+ if (newval == NULL)
+ return false;
+ }
+ }
+ /* else we handle a "RESET varname" command */
else if (conf->reset_val)
{
/*
int c;
StringInfoData buf;
+ /*
+ * Resetting custom_variable_classes by removing it from the
+ * configuration file will lead to newval = NULL
+ */
+ if (newval == NULL)
+ return guc_strdup(ERROR, "");
+
initStringInfo(&buf);
while ((c = *cp++) != 0)
{
if (buf.len == 0)
newval = NULL;
else if (doit)
- newval = strdup(buf.data);
+ newval = guc_strdup(ERROR, buf.data);
pfree(buf.data);
return newval;
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