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Annotation of embedaddon/quagga/lib/daemon.c, revision 1.1

1.1     ! misho       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 */