1 /* $NetBSD: daemon.c,v 1.1.1.1 2011/04/13 18:15:40 elric Exp $ */ 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 #if defined(LIBC_SCCS) && !defined(lint) 33 static char sccsid[] = "@(#)daemon.c 8.1 (Berkeley) 6/4/93"; 34 #endif /* LIBC_SCCS and not lint */ 35 36 #include <config.h> 37 38 #ifndef HAVE_DAEMON 39 40 #ifdef HAVE_FCNTL_H 41 #include <fcntl.h> 42 #endif 43 #ifdef HAVE_PATHS_H 44 #include <paths.h> 45 #endif 46 #ifdef HAVE_UNISTD_H 47 #include <unistd.h> 48 #endif 49 50 #include <krb5/roken.h> 51 52 ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL 53 daemon(int nochdir, int noclose) 54 { 55 int fd; 56 57 switch (fork()) { 58 case -1: 59 return (-1); 60 case 0: 61 break; 62 default: 63 _exit(0); 64 } 65 66 if (setsid() == -1) 67 return (-1); 68 69 if (!nochdir) 70 chdir("/"); 71 72 if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 73 dup2(fd, STDIN_FILENO); 74 dup2(fd, STDOUT_FILENO); 75 dup2(fd, STDERR_FILENO); 76 if (fd > 2) 77 close (fd); 78 } 79 return (0); 80 } 81 82 #endif /* HAVE_DAEMON */ 83