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quagga

    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: #include <log.h>
   25: 
   26: #ifndef HAVE_DAEMON
   27: 
   28: /* Daemonize myself. */
   29: int
   30: daemon (int nochdir, int noclose)
   31: {
   32:   pid_t pid;
   33: 
   34:   pid = fork ();
   35: 
   36:   /* In case of fork is error. */
   37:   if (pid < 0)
   38:     {
   39:       zlog_err ("fork failed: %s", safe_strerror(errno));
   40:       return -1;
   41:     }
   42: 
   43:   /* In case of this is parent process. */
   44:   if (pid != 0)
   45:     exit (0);
   46: 
   47:   /* Become session leader and get pid. */
   48:   pid = setsid();
   49: 
   50:   if (pid == -1)
   51:     {
   52:       zlog_err ("setsid failed: %s", safe_strerror(errno));
   53:       return -1;
   54:     }
   55: 
   56:   /* Change directory to root. */
   57:   if (! nochdir)
   58:     chdir ("/");
   59: 
   60:   /* File descriptor close. */
   61:   if (! noclose)
   62:     {
   63:       int fd;
   64: 
   65:       fd = open ("/dev/null", O_RDWR, 0);
   66:       if (fd != -1)
   67: 	{
   68: 	  dup2 (fd, STDIN_FILENO);
   69: 	  dup2 (fd, STDOUT_FILENO);
   70: 	  dup2 (fd, STDERR_FILENO);
   71: 	  if (fd > 2)
   72: 	    close (fd);
   73: 	}
   74:     }
   75: 
   76:   umask (0027);
   77: 
   78:   return 0;
   79: }
   80: 
   81: #endif /* HAVE_DAEMON */