1 /*- 2 * Copyright (c) 1999 Berkeley Software Design, Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 3. Berkeley Software Design Inc's name may not be used to endorse or 13 * promote products derived from this software without specific prior 14 * written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN INC ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL BERKELEY SOFTWARE DESIGN INC BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * From BSDI: daemon.c,v 1.2 1996/08/15 01:11:09 jch Exp 29 * $FreeBSD: src/usr.sbin/daemon/daemon.c,v 1.1.2.1 2002/08/28 17:25:54 sheldonh Exp $ 30 * $DragonFly: src/usr.sbin/daemon/daemon.c,v 1.4 2004/12/21 23:30:57 liamfoy Exp $ 31 */ 32 33 #include <sys/types.h> 34 35 #include <err.h> 36 #include <errno.h> 37 #include <stdio.h> 38 #include <stdlib.h> 39 #include <unistd.h> 40 41 static void usage(void); 42 43 int 44 main(int argc, char *argv[]) 45 { 46 int ch, nochdir, noclose, errcode; 47 FILE *pidf; 48 const char *pidfile; 49 50 nochdir = noclose = 1; 51 pidfile = NULL; 52 pidf = 0; 53 while ((ch = getopt(argc, argv, "cfp:")) != -1) { 54 switch (ch) { 55 case 'c': 56 nochdir = 0; 57 break; 58 case 'f': 59 noclose = 0; 60 break; 61 case 'p': 62 pidfile = optarg; 63 break; 64 case '?': 65 default: 66 usage(); 67 } 68 } 69 argc -= optind; 70 argv += optind; 71 72 if (argc == 0) 73 usage(); 74 75 /* 76 * Try to open the pidfile before calling daemon(3), 77 * to be able to report the error intelligently 78 */ 79 if (pidfile) { 80 pidf = fopen(pidfile, "w"); 81 if (pidf == NULL) 82 err(1, "pidfile ``%s''", pidfile); 83 } 84 85 if (daemon(nochdir, noclose) == -1) 86 err(1, "daemon failed"); 87 88 /* Now that we are the child, write out the pid */ 89 if (pidfile) { 90 fprintf(pidf, "%ld\n", (long)getpid()); 91 fclose(pidf); 92 } 93 94 execvp(argv[0], argv); 95 96 /* 97 * execvp() failed -- unlink pidfile if any, and 98 * report the error 99 */ 100 errcode = errno; /* Preserve errcode -- unlink may reset it */ 101 if (pidfile) 102 unlink(pidfile); 103 104 /* The child is now running, so the exit status doesn't matter. */ 105 errc(1, errcode, "%s", argv[0]); 106 } 107 108 static void 109 usage(void) 110 { 111 fprintf(stderr, "usage: daemon [-cf] [-p pidfile] command arguments ...\n"); 112 exit(1); 113 } 114