1/*
2 * Daemonize routine
3 * Copyright (C) 1997, 1999 Kunihiro Ishiguro
4 *
5 * This file is part of GNU Zebra.
6 *
7 * GNU Zebra is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published
9 * by the Free Software Foundation; either version 2, or (at your
10 * option) any later version.
11 *
12 * GNU Zebra is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with GNU Zebra; see the file COPYING.  If not, write to the
19 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 * Boston, MA 02111-1307, USA.
21 */
22
23#include <zebra.h>
24
25#ifndef HAVE_DAEMON
26
27/* Daemonize myself. */
28int
29daemon (int nochdir, int noclose)
30{
31  pid_t pid;
32
33  pid = fork ();
34
35  /* In case of fork is error. */
36  if (pid < 0)
37    {
38      perror ("fork");
39      return -1;
40    }
41
42  /* In case of this is parent process. */
43  if (pid != 0)
44    exit (0);
45
46  /* Become session leader and get pid. */
47  pid = setsid();
48
49  if (pid < -1)
50    {
51      perror ("setsid");
52      return -1;
53    }
54
55  /* Change directory to root. */
56  if (! nochdir)
57    chdir ("/");
58
59  /* File descriptor close. */
60  if (! noclose)
61    {
62      int fd;
63
64      fd = open ("/dev/null", O_RDWR, 0);
65      if (fd != -1)
66	{
67	  dup2 (fd, STDIN_FILENO);
68	  dup2 (fd, STDOUT_FILENO);
69	  dup2 (fd, STDERR_FILENO);
70	  if (fd > 2)
71	    close (fd);
72	}
73    }
74
75  umask (0027);
76
77  return 0;
78}
79
80#endif /* HAVE_DAEMON */
81