1 /* -*- mode: c; c-file-style: "bsd"; indent-tabs-mode: t -*- */ 2 /* 3 * Copyright (c) 1990 The Regents of the University of California. 4 * 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. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by the University of 17 * California, Berkeley and its contributors. 18 * 4. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include "k5-int.h" 36 #include <fcntl.h> 37 #include <sys/types.h> 38 #include <sys/file.h> 39 #include <unistd.h> 40 #ifdef HAVE_PATHS_H 41 #include <paths.h> 42 #endif 43 44 #ifndef _PATH_DEVNULL 45 #define _PATH_DEVNULL "/dev/null" 46 #endif 47 48 int 49 daemon(nochdir, noclose) 50 int nochdir, noclose; 51 { 52 int cpid; 53 54 if ((cpid = fork()) == -1) 55 return (-1); 56 if (cpid) 57 exit(0); 58 #ifdef HAVE_SETSID 59 (void) setsid(); 60 #else 61 #ifndef TIOCNOTTY 62 setpgrp(); 63 #else 64 { 65 int n; 66 67 /* 68 * The open below may hang on pseudo ttys if the person 69 * who starts named logs out before this point. Thus, 70 * the need for the timer. 71 */ 72 alarm(120); 73 n = open("/dev/tty", O_RDWR); 74 alarm(0); 75 if (n > 0) { 76 (void) ioctl(n, TIOCNOTTY, (char *)NULL); 77 (void) close(n); 78 } 79 } 80 #endif 81 #endif 82 if (!nochdir) 83 (void) chdir("/"); 84 if (!noclose) { 85 int devnull = open(_PATH_DEVNULL, O_RDWR, 0); 86 87 if (devnull != -1) { 88 (void) dup2(devnull, 0); 89 (void) dup2(devnull, 1); 90 (void) dup2(devnull, 2); 91 if (devnull > 2) 92 (void) close(devnull); 93 } 94 } 95 return (0); 96 } 97