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/*
* Daemonize routine
* Copyright (C) 1997, 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>
#ifndef HAVE_DAEMON
/* Daemonize myself. */
int
daemon (int nochdir, int noclose)
{
pid_t pid;
pid = fork ();
/* In case of fork is error. */
if (pid < 0)
{
zlog_err ("fork failed: %s", safe_strerror(errno));
return -1;
}
/* In case of this is parent process. */
if (pid != 0)
exit (0);
/* Become session leader and get pid. */
pid = setsid();
if (pid == -1)
{
zlog_err ("setsid failed: %s", safe_strerror(errno));
return -1;
}
/* Change directory to root. */
if (! nochdir)
chdir ("/");
/* File descriptor close. */
if (! noclose)
{
int fd;
fd = open ("/dev/null", O_RDWR, 0);
if (fd != -1)
{
dup2 (fd, STDIN_FILENO);
dup2 (fd, STDOUT_FILENO);
dup2 (fd, STDERR_FILENO);
if (fd > 2)
close (fd);
}
}
umask (0027);
return 0;
}
#endif /* HAVE_DAEMON */
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