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 82