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/param.h> 35 36 #include <err.h> 37 #include <errno.h> 38 #include <libutil.h> 39 #include <stdio.h> 40 #include <stdlib.h> 41 #include <unistd.h> 42 43 static void usage(void); 44 45 int 46 main(int argc, char *argv[]) 47 { 48 struct pidfh *pfh; 49 int ch, nochdir, noclose, errcode; 50 const char *pidfile; 51 pid_t otherpid; 52 53 nochdir = noclose = 1; 54 pidfile = NULL; 55 while ((ch = getopt(argc, argv, "-cfp:")) != -1) { 56 switch (ch) { 57 case 'c': 58 nochdir = 0; 59 break; 60 case 'f': 61 noclose = 0; 62 break; 63 case 'p': 64 pidfile = optarg; 65 break; 66 default: 67 usage(); 68 } 69 } 70 argc -= optind; 71 argv += optind; 72 73 if (argc == 0) 74 usage(); 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 pfh = pidfile_open(pidfile, 0600, &otherpid); 81 if (pfh == NULL) { 82 if (errno == EEXIST) { 83 errx(3, "process already running, pid: %d", 84 otherpid); 85 } 86 err(2, "pidfile ``%s''", pidfile); 87 } 88 } 89 90 if (daemon(nochdir, noclose) == -1) 91 err(1, NULL); 92 93 /* Now that we are the child, write out the pid */ 94 if (pidfile) 95 pidfile_write(pfh); 96 97 execvp(argv[0], argv); 98 99 /* 100 * execvp() failed -- unlink pidfile if any, and 101 * report the error 102 */ 103 errcode = errno; /* Preserve errcode -- unlink may reset it */ 104 if (pidfile) 105 pidfile_remove(pfh); 106 107 /* The child is now running, so the exit status doesn't matter. */ 108 errc(1, errcode, "%s", argv[0]); 109 } 110 111 static void 112 usage(void) 113 { 114 (void)fprintf(stderr, 115 "usage: daemon [-cf] [-p pidfile] command arguments ...\n"); 116 exit(1); 117 } 118