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 */ 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include <sys/types.h> 35 36 #include <err.h> 37 #include <errno.h> 38 #include <stdio.h> 39 #include <stdlib.h> 40 #include <unistd.h> 41 42 static void usage(void); 43 44 int 45 main(int argc, char *argv[]) 46 { 47 int ch, nochdir, noclose, errcode; 48 FILE *pidf; 49 const char *pidfile; 50 51 nochdir = noclose = 1; 52 pidfile = NULL; 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 default: 65 usage(); 66 } 67 } 68 argc -= optind; 69 argv += optind; 70 71 if (argc == 0) 72 usage(); 73 /* 74 * Try to open the pidfile before calling daemon(3), 75 * to be able to report the error intelligently 76 */ 77 if (pidfile) { 78 pidf = fopen(pidfile, "w"); 79 if (pidf == NULL) 80 err(2, "pidfile ``%s''", pidfile); 81 } 82 83 if (daemon(nochdir, noclose) == -1) 84 err(1, NULL); 85 86 /* Now that we are the child, write out the pid */ 87 if (pidfile) { 88 fprintf(pidf, "%lu\n", (unsigned long)getpid()); 89 fclose(pidf); 90 } 91 92 execvp(argv[0], argv); 93 94 /* 95 * execvp() failed -- unlink pidfile if any, and 96 * report the error 97 */ 98 errcode = errno; /* Preserve errcode -- unlink may reset it */ 99 if (pidfile) 100 unlink(pidfile); 101 102 /* The child is now running, so the exit status doesn't matter. */ 103 errc(1, errcode, "%s", argv[0]); 104 } 105 106 static void 107 usage(void) 108 { 109 (void)fprintf(stderr, 110 "usage: daemon [-cf] [-p pidfile] command arguments ...\n"); 111 exit(1); 112 } 113