The routines in magic.c have moved to the more accessible version.c.

src/backend/utils/init/magic.c

-/*-------------------------------------------------------------------------
- *
- * magic.c--
- *    magic number management routines
- *
- * Copyright (c) 1994, Regents of the University of California
- *
- *
- * IDENTIFICATION
- *    $Header: /cvsroot/pgsql/src/backend/utils/init/Attic/magic.c,v 1.3 1996/11/06 10:31:56 scrappy Exp $
- *
- * NOTES
- *	XXX eventually, should be able to handle version identifiers
- *	of length != 4.
- *
- *  STANDALONE CODE - do not use error routines as this code is linked with
- *  stuff that does not cinterface.a
- *-------------------------------------------------------------------------
- */
-#include <sys/file.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <ctype.h>
-#include <string.h>
-#include <stdio.h>
-#include <unistd.h>
-
-#include "postgres.h"
-
-#include "miscadmin.h"		/* for global decls */
-
-#include "storage/fd.h"		/* for O_ */
-
-static char	Pg_verfile[] = PG_VERFILE;
-
-
-/*
- * private function prototypes
- */
-static void PathSetVersionFilePath(const char *path, char *filepathbuf);
-
-/*
- * DatabaseMetaGunkIsConsistent
- *
- * Returns 1 iff all version numbers and ownerships are consistent.
- *
- * Note that we have to go through the whole rigmarole of generating the path
- * and checking the existence of the database whether Noversion is set or not.
- */
-int
-DatabaseMetaGunkIsConsistent(const char *database, char *path)
-{
-    int		isValid;
-#ifndef WIN32
-    struct stat	statbuf;
-#else    
-    struct _stat statbuf;
-#endif
-
-    /* XXX We haven't changed PG_VERSION since 1.1! */
-#ifndef WIN32    
-    isValid = ValidPgVersion(DataDir);
-    sprintf(path, "%s/base/%s", DataDir, database);
-    isValid = ValidPgVersion(path) || isValid;
-#endif /* WIN32 */
-    
-    if (stat(path, &statbuf) < 0)
-	elog(FATAL, "database %s does not exist, bailing out...",
-	     database);
-    
-    return(isValid);
-}
-
-
-/*
- * ValidPgVersion	- verifies the consistency of the database
- *
- *	Returns 1 iff the catalog version number (from the version number file
- *	in the directory specified in "path") is consistent with the backend
- *	version number.
- */
-int
-ValidPgVersion(const char *path)
-{
-    int		fd;
-    char		version[4], buf[MAXPGPATH+1];
-#ifndef WIN32
-    struct stat	statbuf;
-#else    
-    struct _stat statbuf;
-#endif    
-    u_short		my_euid = geteuid();
-    
-    PathSetVersionFilePath(path, buf);
-    
-    if (stat(buf, &statbuf) >= 0) {
-	if (statbuf.st_uid != my_euid && my_euid != 0)
-	    elog(FATAL,
-		 "process userid (%d) != database owner (%d)",
-		 my_euid, statbuf.st_uid);
-    } else
-	return(0);
-    
-    if ((fd = open(buf, O_RDONLY, 0)) < 0) {
-	if (!Noversion)
-	    elog(DEBUG, "ValidPgVersion: %s: %m", buf);
-	return(0);
-    }
-    
-    if (read(fd, version, 4) < 4 ||
-	!isascii(version[0]) || !isdigit(version[0]) ||
-	version[1] != '.' ||
-	!isascii(version[2]) || !isdigit(version[2]) ||
-	version[3] != '\n')
-	elog(FATAL, "ValidPgVersion: %s: bad format", buf);
-    if (version[2] != '0' + PG_VERSION ||
-	version[0] != '0' + PG_RELEASE) {
-	if (!Noversion)
-	    elog(DEBUG,
-		 "ValidPgVersion: should be %d.%d not %c.%c",
-		 PG_RELEASE, PG_VERSION, version[0], version[2]);
-	close(fd);
-	return(0);
-    }
-    close(fd);
-    return(1);
-}
-
-
-/*
- *	SetPgVersion	- writes the version to a database directory
- */
-void
-SetPgVersion(const char *path)
-{
-    int	fd;
-    char	version[4], buf[MAXPGPATH+1];
-    
-    PathSetVersionFilePath(path, buf);
-    
-    if ((fd = open(buf, O_WRONLY|O_CREAT|O_EXCL, 0666)) < 0)
-	elog(FATAL, "SetPgVersion: %s: %m", buf);
-    
-    version[0] = '0' + PG_RELEASE;
-    version[1] = '.';
-    version[2] = '0' + PG_VERSION;
-    version[3] = '\n';
-    if (write(fd, version, 4) != 4)
-	elog(WARN, "SetPgVersion: %s: %m", buf);
-    
-    close(fd);
-}
-
-
-/*
- * PathSetVersionFilePath
- *
- * Destructively change "filepathbuf" to contain the concatenation of "path"
- * and the name of the version file name.
- */
-static void
-PathSetVersionFilePath(const char *path, char *filepathbuf)
-{
-    if (strlen(path) > (MAXPGPATH - sizeof(Pg_verfile) - 1))
-	elog(FATAL, "PathSetVersionFilePath: %s: path too long");
-    sprintf(filepathbuf, "%s%c%s", path, SEP_CHAR, Pg_verfile);
-}