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/*
* Process id output.
* Copyright (C) 1998, 1999 Kunihiro Ishiguro
*
* This file is part of GNU Zebra.
*
* GNU Zebra is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2, or (at your option) any
* later version.
*
* GNU Zebra is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Zebra; see the file COPYING. If not, write to the Free
* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*/
#include <zebra.h>
#include <fcntl.h>
#include <log.h>
#include "version.h"
pid_t
pid_output (const char *path)
{
#ifndef HAVE_FCNTL
FILE *fp;
pid_t pid;
mask_t oldumask;
pid = getpid();
oldumask = umask(0777 & ~LOGFILE_MASK);
fp = fopen (path, "w");
if (fp != NULL)
{
fprintf (fp, "%d\n", (int) pid);
fclose (fp);
umask(oldumask);
return -1;
}
umask(oldumask);
return pid;
#else
static pid_t pid_output_lock (const char *);
return pid_output_lock(path);
#endif /* HAVE_FCNTL */
}
#ifdef HAVE_FCNTL
static pid_t
pid_output_lock (const char *path)
{
int tmp;
int fd;
pid_t pid;
char buf[16];
struct flock lock;
mode_t oldumask;
pid = getpid ();
oldumask = umask(0777 & ~LOGFILE_MASK);
fd = open (path, O_RDWR | O_CREAT, LOGFILE_MASK);
if (fd < 0)
{
zlog_err( "Can't creat pid lock file %s (%s), exit",
path, safe_strerror(errno));
umask(oldumask);
exit (-1);
}
else
{
size_t pidsize;
umask(oldumask);
memset (&lock, 0, sizeof(lock));
lock.l_type = F_WRLCK;
lock.l_whence = SEEK_SET;
if (fcntl(fd, F_SETLK, &lock) < 0)
{
zlog_err("Could not lock pid_file %s, exit", path);
exit (-1);
}
sprintf (buf, "%d\n", (int) pid);
pidsize = strlen(buf);
if ((tmp = write (fd, buf, pidsize)) != (int)pidsize)
zlog_err("Could not write pid %d to pid_file %s, rc was %d: %s",
(int)pid,path,tmp,safe_strerror(errno));
else if (ftruncate(fd, pidsize) < 0)
zlog_err("Could not truncate pid_file %s to %u bytes: %s",
path,(u_int)pidsize,safe_strerror(errno));
}
return pid;
}
#endif /* HAVE_FCNTL */
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