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 int 38 daemon(int nochdir, int noclose) 39 { 40 int fd; 41 42 switch (fork()) { 43 case -1: 44 return (-1); 45 case 0: 46 #ifdef HAVE_CYGWIN 47 register_9x_service(); 48 #endif 49 break; 50 default: 51 #ifdef HAVE_CYGWIN 52 /* 53 * This sleep avoids a race condition which kills the 54 * child process if parent is started by a NT/W2K service. 55 */ 56 sleep(1); 57 #endif 58 _exit(0); 59 } 60 61 if (setsid() == -1) 62 return (-1); 63 64 if (!nochdir) 65 (void)chdir("/"); 66 67 if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 68 (void)dup2(fd, STDIN_FILENO); 69 (void)dup2(fd, STDOUT_FILENO); 70 (void)dup2(fd, STDERR_FILENO); 71 if (fd > 2) 72 (void)close (fd); 73 } 74 return (0); 75 } 76 77 #endif /* !HAVE_DAEMON */ 78 79