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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>
pid_t
pid_output (char *path)
{
FILE *fp;
pid_t pid;
pid = getpid();
fp = fopen (path, "w");
if (fp != NULL)
{
fprintf (fp, "%d\n", (int) pid);
fclose (fp);
return -1;
}
return pid;
}
pid_t
pid_output_lock (char *path)
{
int tmp;
int fd;
pid_t pid;
char buf[16], *p;
pid = getpid ();
fd = open (path, O_RDWR | O_CREAT | O_EXCL, 0644);
if (fd < 0)
{
fd = open (path, O_RDONLY);
if (fd < 0)
fprintf (stderr, "Can't creat pid lock file, exit\n");
else
{
read (fd, buf, sizeof (buf));
if ((p = index (buf, '\n')) != NULL)
*p = 0;
fprintf (stderr, "Another process(%s) running, exit\n", buf);
}
exit (-1);
}
else
{
sprintf (buf, "%d\n", (int) pid);
tmp = write (fd, buf, strlen (buf));
close (fd);
}
return pid;
}
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