crypto/openssh-3.9p1/openbsd-compat/daemon.c

   1 /* OPENBSD ORIGINAL: lib/libc/gen/daemon.c */
   2
   3 /*-
   4  * Copyright (c) 1990, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include "includes.h"
  33
  34 #ifndef HAVE_DAEMON
  35
  36 #if defined(LIBC_SCCS) && !defined(lint)
  37 static char rcsid[] = "$OpenBSD: daemon.c,v 1.5 2003/07/15 17:32:41 deraadt Exp $";
  38 #endif /* LIBC_SCCS and not lint */
  39
  40 int
  41 daemon(int nochdir, int noclose)
  42 {
  43         int fd;
  44
  45         switch (fork()) {
  46         case -1:
  47                 return (-1);
  48         case 0:
  49 #ifdef HAVE_CYGWIN
  50                 register_9x_service();
  51 #endif
  52                 break;
  53         default:
  54 #ifdef HAVE_CYGWIN
  55                 /*
  56                  * This sleep avoids a race condition which kills the
  57                  * child process if parent is started by a NT/W2K service.
  58                  */
  59                 sleep(1);
  60 #endif
  61                 _exit(0);
  62         }
  63
  64         if (setsid() == -1)
  65                 return (-1);
  66
  67         if (!nochdir)
  68                 (void)chdir("/");
  69
  70         if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
  71                 (void)dup2(fd, STDIN_FILENO);
  72                 (void)dup2(fd, STDOUT_FILENO);
  73                 (void)dup2(fd, STDERR_FILENO);
  74                 if (fd > 2)
  75                         (void)close (fd);
  76         }
  77         return (0);
  78 }
  79
  80 #endif /* !HAVE_DAEMON */
  81