compat/daemon.c

   1 /*      $OpenBSD: daemon.c,v 1.6 2005/08/08 08:05:33 espie Exp $ */
   2 /*-
   3  * Copyright (c) 1990, 1993
   4  *      The Regents of the University of California.  All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  * 3. Neither the name of the University nor the names of its contributors
  15  *    may be used to endorse or promote products derived from this software
  16  *    without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  28  * SUCH DAMAGE.
  29  */
  30
  31 #include <sys/types.h>
  32
  33 #include <fcntl.h>
  34 #include <unistd.h>
  35 #include <stdlib.h>
  36
  37 #include "compat.h"
  38
  39 #ifdef __APPLE__
  40 extern void daemon_darwin(void);
  41 #endif
  42
  43 int
  44 daemon(int nochdir, int noclose)
  45 {
  46         int fd;
  47
  48         switch (fork()) {
  49         case -1:
  50                 return (-1);
  51         case 0:
  52                 break;
  53         default:
  54                 _exit(0);
  55         }
  56
  57         if (setsid() == -1)
  58                 return (-1);
  59
  60         if (!nochdir)
  61                 (void)chdir("/");
  62
  63         if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
  64                 (void)dup2(fd, STDIN_FILENO);
  65                 (void)dup2(fd, STDOUT_FILENO);
  66                 (void)dup2(fd, STDERR_FILENO);
  67                 if (fd > 2)
  68                         (void)close (fd);
  69         }
  70
  71 #ifdef __APPLE__
  72         daemon_darwin();
  73 #endif
  74         return (0);
  75 }