openbsd-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 /* OPENBSD ORIGINAL: lib/libc/gen/daemon.c */
  32
  33 #include "includes.h"
  34
  35 #ifndef HAVE_DAEMON
  36
  37 #include <sys/types.h>
  38
  39 #ifdef HAVE_SYS_STAT_H
  40 # include <sys/stat.h>
  41 #endif
  42
  43 #ifdef HAVE_FCNTL_H
  44 # include <fcntl.h>
  45 #endif
  46
  47 #ifdef HAVE_UNISTD_H
  48 # include <unistd.h>
  49 #endif
  50
  51 int
  52 daemon(int nochdir, int noclose)
  53 {
  54         int fd;
  55
  56         switch (fork()) {
  57         case -1:
  58                 return (-1);
  59         case 0:
  60                 break;
  61         default:
  62                 _exit(0);
  63         }
  64
  65         if (setsid() == -1)
  66                 return (-1);
  67
  68         if (!nochdir)
  69                 (void)chdir("/");
  70
  71         if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
  72                 (void)dup2(fd, STDIN_FILENO);
  73                 (void)dup2(fd, STDOUT_FILENO);
  74                 (void)dup2(fd, STDERR_FILENO);
  75                 if (fd > 2)
  76                         (void)close (fd);
  77         }
  78         return (0);
  79 }
  80
  81 #endif /* !HAVE_DAEMON */
  82