1 /* $FreeBSD$ */ 2 /* $OpenBSD: pidfile.c,v 1.5 2002/05/26 09:29:02 deraadt Exp $ */ 3 /* $NetBSD: pidfile.c,v 1.4 2001/02/19 22:43:42 cgd Exp $ */ 4 5 /*- 6 * Copyright (c) 1999 The NetBSD Foundation, Inc. 7 * All rights reserved. 8 * 9 * This code is derived from software contributed to The NetBSD Foundation 10 * by Jason R. Thorpe. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the NetBSD 23 * Foundation, Inc. and its contributors. 24 * 4. Neither the name of The NetBSD Foundation nor the names of its 25 * contributors may be used to endorse or promote products derived 26 * from this software without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 29 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 30 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 31 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 32 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 33 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 34 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 35 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 36 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 37 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 38 * POSSIBILITY OF SUCH DAMAGE. 39 */ 40 41 #if defined(LIBC_SCCS) && !defined(lint) 42 static const char rcsid[] = "$OpenBSD: pidfile.c,v 1.5 2002/05/26 09:29:02 deraadt Exp $"; 43 #endif /* LIBC_SCCS and not lint */ 44 45 #include <sys/param.h> 46 #include <errno.h> 47 #include <paths.h> 48 #include <stdio.h> 49 #include <stdlib.h> 50 #include <unistd.h> 51 #ifdef __FreeBSD__ 52 #include "pidfile.h" 53 #else 54 #include <util.h> 55 #endif 56 57 static char *pidfile_path; 58 static pid_t pidfile_pid; 59 60 static void pidfile_cleanup(void); 61 62 extern char *__progname; 63 64 int 65 pidfile(const char *basename) 66 { 67 FILE *f; 68 int save_errno; 69 pid_t pid; 70 71 if (basename == NULL) 72 basename = __progname; 73 74 if (pidfile_path != NULL) { 75 free(pidfile_path); 76 pidfile_path = NULL; 77 } 78 79 /* _PATH_VARRUN includes trailing / */ 80 (void) asprintf(&pidfile_path, "%s%s.pid", _PATH_VARRUN, basename); 81 if (pidfile_path == NULL) 82 return (-1); 83 84 if ((f = fopen(pidfile_path, "w")) == NULL) { 85 save_errno = errno; 86 free(pidfile_path); 87 pidfile_path = NULL; 88 errno = save_errno; 89 return (-1); 90 } 91 92 pid = getpid(); 93 if (fprintf(f, "%ld\n", (long)pid) <= 0 || fclose(f) != 0) { 94 save_errno = errno; 95 (void) unlink(pidfile_path); 96 free(pidfile_path); 97 pidfile_path = NULL; 98 errno = save_errno; 99 return (-1); 100 } 101 102 pidfile_pid = pid; 103 if (atexit(pidfile_cleanup) < 0) { 104 save_errno = errno; 105 (void) unlink(pidfile_path); 106 free(pidfile_path); 107 pidfile_path = NULL; 108 pidfile_pid = 0; 109 errno = save_errno; 110 return (-1); 111 } 112 113 return (0); 114 } 115 116 static void 117 pidfile_cleanup(void) 118 { 119 120 if (pidfile_path != NULL && pidfile_pid == getpid()) 121 (void) unlink(pidfile_path); 122 } 123