1 /*- 2 * Copyright (c) 1990, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include "includes.h" 35 36 #ifndef HAVE_DAEMON 37 38 #if defined(LIBC_SCCS) && !defined(lint) 39 static char rcsid[] = "$OpenBSD: daemon.c,v 1.2 1996/08/19 08:22:13 tholo Exp $"; 40 #endif /* LIBC_SCCS and not lint */ 41 42 int 43 daemon(nochdir, noclose) 44 int nochdir, noclose; 45 { 46 int fd; 47 48 switch (fork()) { 49 case -1: 50 return (-1); 51 case 0: 52 #ifdef HAVE_CYGWIN 53 register_9x_service(); 54 #endif 55 break; 56 default: 57 #ifdef HAVE_CYGWIN 58 /* 59 * This sleep avoids a race condition which kills the 60 * child process if parent is started by a NT/W2K service. 61 */ 62 sleep(1); 63 #endif 64 _exit(0); 65 } 66 67 if (setsid() == -1) 68 return (-1); 69 70 if (!nochdir) 71 (void)chdir("/"); 72 73 if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 74 (void)dup2(fd, STDIN_FILENO); 75 (void)dup2(fd, STDOUT_FILENO); 76 (void)dup2(fd, STDERR_FILENO); 77 if (fd > 2) 78 (void)close (fd); 79 } 80 return (0); 81 } 82 83 #endif /* !HAVE_DAEMON */ 84 85