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 #ifdef HAVE_CYGWIN 61 register_9x_service(); 62 #endif 63 break; 64 default: 65 #ifdef HAVE_CYGWIN 66 /* 67 * This sleep avoids a race condition which kills the 68 * child process if parent is started by a NT/W2K service. 69 */ 70 sleep(1); 71 #endif 72 _exit(0); 73 } 74 75 if (setsid() == -1) 76 return (-1); 77 78 if (!nochdir) 79 (void)chdir("/"); 80 81 if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 82 (void)dup2(fd, STDIN_FILENO); 83 (void)dup2(fd, STDOUT_FILENO); 84 (void)dup2(fd, STDERR_FILENO); 85 if (fd > 2) 86 (void)close (fd); 87 } 88 return (0); 89 } 90 91 #endif /* !HAVE_DAEMON */ 92 93