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The heralded `Grand Unified Configuration scheme' (GUC)
That means you can now set your options in either or all of $PGDATA/configuration, some postmaster option (--enable-fsync=off), or set a SET command. The list of options is in backend/utils/misc/guc.c, documentation will be written post haste. pg_options is gone, so is that pq_geqo config file. Also removed were backend -K, -Q, and -T options (no longer applicable, although -d0 does the same as -Q). Added to configure an --enable-syslog option. changed all callers from TPRINTF to elog(DEBUG)
This commit is contained in:
Peter Eisentraut
282
src/backend/utils/misc/guc-file.l
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282
src/backend/utils/misc/guc-file.l
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@@ -0,0 +1,282 @@
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/* -*-pgsql-c-*- */
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/*
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* Scanner for the configuration file
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*
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* Copyright 2000 by PostgreSQL Global Development Group
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*
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* $Header: /cvsroot/pgsql/src/backend/utils/misc/guc-file.l,v 1.1 2000/05/31 00:28:34 petere Exp $
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*/
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%{
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#include "postgres.h"
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#include <string.h>
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#include <stdarg.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <errno.h>
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#include "miscadmin.h"
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#include "storage/fd.h"
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#include "utils/elog.h"
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#include "utils/guc.h"
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static unsigned ConfigFileLineno;
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enum {
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GUC_ID = 1,
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GUC_STRING = 2,
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GUC_INTEGER = 3,
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GUC_REAL = 4,
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GUC_EQUALS = 5,
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GUC_EOL = 99,
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GUC_ERROR = 100,
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};
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#if defined(yywrap)
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#undef yywrap
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#endif /* yywrap */
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#define YY_USER_INIT (ConfigFileLineno = 1)
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#define YY_NO_UNPUT
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%}
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SIGN ("-"|"+")
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DIGIT [0-9]
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HEXDIGIT [0-9a-fA-F]
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INTEGER {SIGN}?({DIGIT}+|0x{HEXDIGIT}+)
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EXPONENT [Ee]{SIGN}?{DIGIT}+
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REAL {SIGN}?{DIGIT}*"."{DIGIT}*{EXPONENT}?
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LETTER [A-Za-z_\200-\377]
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LETTER_OR_DIGIT [A-Za-z_0-9\200-\377]
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ID {LETTER}{LETTER_OR_DIGIT}*
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/*
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* FIXME: This string syntax is nice and all but of course the quotes
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* need to be stripped before we can make any use of the string value.
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* There is a function in parser/scansup.c that does this but it uses
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* palloc and there might be a little more magic needed to get it to
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* work right. Now there are no string options, and if there were then
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* the unquoted (`ID') tokens should still work. Of course this only
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* affects the configuration file.
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*/
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STRING \'([^'\n]|\\.)*'
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%%
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\n ConfigFileLineno++; return GUC_EOL;
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[ \t\r]+ /* eat whitespace */
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#.*$ /* eat comment */
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{ID} return GUC_ID;
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{STRING} return GUC_STRING;
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{INTEGER} return GUC_INTEGER;
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{REAL} return GUC_REAL;
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= return GUC_EQUALS;
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. return GUC_ERROR;
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%%
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struct name_value_pair
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{
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char *name;
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char *value;
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struct name_value_pair *next;
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};
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/*
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* Free a list of name/value pairs, including the names and the values
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*/
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static void
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free_name_value_list(struct name_value_pair * list)
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{
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struct name_value_pair *item;
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item = list;
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while (item)
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{
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struct name_value_pair *save;
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save = item->next;
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free(item->name);
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free(item->value);
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free(item);
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item = save;
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}
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}
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/*
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* Official function to read and process the configuration file. The
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* parameter indicates in what context the file is being read
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* (postmaster startup, backend startup, or SIGHUP). All options
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* mentioned in the configuration file are set to new values. This
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* function does not return if an error occurs. If an error occurs, no
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* values will be changed.
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*/
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void
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ProcessConfigFile(unsigned int context)
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{
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int token, parse_state;
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char *opt_name, *opt_value;
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char *filename;
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struct stat stat_buf;
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struct name_value_pair *item, *head, *tail;
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int elevel;
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FILE * fp;
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Assert(context == PGC_POSTMASTER || context == PGC_BACKEND || context == PGC_SIGHUP);
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Assert(DataDir);
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elevel = (context == PGC_SIGHUP) ? DEBUG : ERROR;
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/*
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* Open file
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*/
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filename = malloc(strlen(DataDir) + 16);
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if (filename == NULL)
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{
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elog(elevel, "out of memory");
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return;
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}
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sprintf(filename, "%s/configuration", DataDir);
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fp = AllocateFile(filename, "r");
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if (!fp)
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{
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free(filename);
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/* File not found is fine */
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if (errno != ENOENT)
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elog(elevel, "could not read configuration: %s", strerror(errno));
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return;
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}
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/*
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* Check if the file is group or world writeable. If so, reject.
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*/
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if (fstat(fileno(fp), &stat_buf) == -1)
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{
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FreeFile(fp);
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free(filename);
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elog(elevel, "could not stat configuration file: %s", strerror(errno));
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return;
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}
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if (stat_buf.st_mode & (S_IWGRP | S_IXGRP | S_IWOTH | S_IXOTH))
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{
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FreeFile(fp);
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free(filename);
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elog(elevel, "configuration file has wrong permissions");
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return;
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}
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/*
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* Parse
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*/
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yyin = fp;
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parse_state = 0;
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head = tail = NULL;
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opt_name = opt_value = NULL;
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while((token = yylex()))
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switch(parse_state)
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{
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case 0: /* no previous input */
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if (token == GUC_EOL) /* empty line */
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continue;
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if (token != GUC_ID)
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goto parse_error;
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opt_name = strdup(yytext);
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if (opt_name == NULL)
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goto out_of_memory;
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parse_state = 1;
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break;
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case 1: /* found name */
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/* ignore equals sign */
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if (token == GUC_EQUALS)
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token = yylex();
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if (token != GUC_ID && token != GUC_STRING && token != GUC_INTEGER && token != GUC_REAL)
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goto parse_error;
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opt_value = strdup(yytext);
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if (opt_value == NULL)
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goto out_of_memory;
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parse_state = 2;
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break;
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case 2: /* now we'd like an end of line */
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if (token != GUC_EOL)
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goto parse_error;
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/* append to list */
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item = malloc(sizeof *item);
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if (item == NULL)
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goto out_of_memory;
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item->name = opt_name;
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item->value = opt_value;
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item->next = NULL;
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if (!head)
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tail = head = item;
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else
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{
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tail->next = item;
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tail = item;
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}
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parse_state = 0;
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break;
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}
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FreeFile(fp);
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free(filename);
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/*
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* Check if all options are valid
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*/
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for(item = head; item; item=item->next)
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{
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if (!set_config_option(item->name, item->value, context, false))
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goto cleanup_exit;
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}
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/* If we got here all the options parsed okay. */
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for(item = head; item; item=item->next)
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set_config_option(item->name, item->value, context, true);
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cleanup_exit:
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free_name_value_list(head);
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return;
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parse_error:
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FreeFile(fp);
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free(filename);
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free_name_value_list(head);
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elog(elevel, "%s:%u: syntax error (ps:%d, t:%d)", filename,
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ConfigFileLineno, parse_state, token);
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return;
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out_of_memory:
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FreeFile(fp);
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free(filename);
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free_name_value_list(head);
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elog(elevel, "out of memory");
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return;
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}
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int
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yywrap(void)
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{
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return 1;
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}
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