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. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #if defined(LIBC_SCCS) && !defined(lint) 31 static char sccsid[] = "@(#)daemon.c 8.1 (Berkeley) 6/4/93"; 32 #endif /* LIBC_SCCS and not lint */ 33 34 #ifdef HAVE_CONFIG_H 35 #include <config.h> 36 #endif 37 38 RCSID("$Id: daemon.c 14773 2005-04-12 11:29:18Z lha $"); 39 40 #ifndef HAVE_DAEMON 41 42 #ifdef HAVE_FCNTL_H 43 #include <fcntl.h> 44 #endif 45 #ifdef HAVE_PATHS_H 46 #include <paths.h> 47 #endif 48 #ifdef HAVE_UNISTD_H 49 #include <unistd.h> 50 #endif 51 52 #include "roken.h" 53 54 int ROKEN_LIB_FUNCTION 55 daemon(int nochdir, int noclose) 56 { 57 int fd; 58 59 switch (fork()) { 60 case -1: 61 return (-1); 62 case 0: 63 break; 64 default: 65 _exit(0); 66 } 67 68 if (setsid() == -1) 69 return (-1); 70 71 if (!nochdir) 72 chdir("/"); 73 74 if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 75 dup2(fd, STDIN_FILENO); 76 dup2(fd, STDOUT_FILENO); 77 dup2(fd, STDERR_FILENO); 78 if (fd > 2) 79 close (fd); 80 } 81 return (0); 82 } 83 84 #endif /* HAVE_DAEMON */ 85