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Where available, use utime() or utimes() to update the file mod time

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of the socket file and socket lock file; this should prevent both of them
from being removed by even the stupidest varieties of /tmp-cleaning
script.  Per suggestion from Giles Lean.
This commit is contained in:
Tom Lane
2003-01-25 05:19:47 +00:00
parent 80727ce14f
commit 15ab7a8720
7 changed files with 99 additions and 25 deletions
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35
src/backend/utils/init/miscinit.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/init/miscinit.c,v 1.98 2002/12/05 04:04:46 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/init/miscinit.c,v 1.99 2003/01/25 05:19:46 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -16,8 +16,9 @@
#include <sys/param.h>
#include <signal.h>
#include <sys/stat.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <fcntl.h>
#include <unistd.h>
#include <grp.h>
@ -25,6 +26,9 @@
#include <errno.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#ifdef HAVE_UTIME_H
#include <utime.h>
#endif
#include "catalog/catname.h"
#include "catalog/pg_shadow.h"
@ -872,27 +876,42 @@ CreateSocketLockFile(const char *socketfile, bool amPostmaster)
}
/*
* Re-read the socket lock file. This should be called every so often
* to ensure that the lock file has a recent access date. That saves it
* TouchSocketLockFile -- mark socket lock file as recently accessed
*
* This routine should be called every so often to ensure that the lock file
* has a recent mod or access date. That saves it
* from being removed by overenthusiastic /tmp-directory-cleaner daemons.
* (Another reason we should never have put the socket file in /tmp...)
*/
void
TouchSocketLockFile(void)
{
int fd;
char buffer[1];
/* Do nothing if we did not create a socket... */
if (socketLockFile[0] != '\0')
{
/* XXX any need to complain about errors here? */
/*
* utime() is POSIX standard, utimes() is a common alternative;
* if we have neither, fall back to actually reading the file
* (which only sets the access time not mod time, but that should
* be enough in most cases). In all paths, we ignore errors.
*/
#ifdef HAVE_UTIME
utime(socketLockFile, NULL);
#else /* !HAVE_UTIME */
#ifdef HAVE_UTIMES
utimes(socketLockFile, NULL);
#else /* !HAVE_UTIMES */
int fd;
char buffer[1];
fd = open(socketLockFile, O_RDONLY | PG_BINARY, 0);
if (fd >= 0)
{
read(fd, buffer, sizeof(buffer));
close(fd);
}
#endif /* HAVE_UTIMES */
#endif /* HAVE_UTIME */
}
}