1171176Smlaier/* $FreeBSD$ */ 2171176Smlaier/* $OpenBSD: pidfile.c,v 1.5 2002/05/26 09:29:02 deraadt Exp $ */ 3171176Smlaier/* $NetBSD: pidfile.c,v 1.4 2001/02/19 22:43:42 cgd Exp $ */ 4171176Smlaier 5171176Smlaier/*- 6171176Smlaier * Copyright (c) 1999 The NetBSD Foundation, Inc. 7171176Smlaier * All rights reserved. 8171176Smlaier * 9171176Smlaier * This code is derived from software contributed to The NetBSD Foundation 10171176Smlaier * by Jason R. Thorpe. 11171176Smlaier * 12171176Smlaier * Redistribution and use in source and binary forms, with or without 13171176Smlaier * modification, are permitted provided that the following conditions 14171176Smlaier * are met: 15171176Smlaier * 1. Redistributions of source code must retain the above copyright 16171176Smlaier * notice, this list of conditions and the following disclaimer. 17171176Smlaier * 2. Redistributions in binary form must reproduce the above copyright 18171176Smlaier * notice, this list of conditions and the following disclaimer in the 19171176Smlaier * documentation and/or other materials provided with the distribution. 20171176Smlaier * 21171176Smlaier * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 22171176Smlaier * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 23171176Smlaier * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 24171176Smlaier * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 25171176Smlaier * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 26171176Smlaier * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 27171176Smlaier * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 28171176Smlaier * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 29171176Smlaier * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 30171176Smlaier * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 31171176Smlaier * POSSIBILITY OF SUCH DAMAGE. 32171176Smlaier */ 33171176Smlaier 34171176Smlaier#if defined(LIBC_SCCS) && !defined(lint) 35171176Smlaierstatic const char rcsid[] = "$OpenBSD: pidfile.c,v 1.5 2002/05/26 09:29:02 deraadt Exp $"; 36171176Smlaier#endif /* LIBC_SCCS and not lint */ 37171176Smlaier 38171176Smlaier#include <sys/param.h> 39171176Smlaier#include <errno.h> 40171176Smlaier#include <paths.h> 41171176Smlaier#include <stdio.h> 42171176Smlaier#include <stdlib.h> 43171176Smlaier#include <unistd.h> 44171176Smlaier#ifdef __FreeBSD__ 45171176Smlaier#include "pidfile.h" 46171176Smlaier#else 47171176Smlaier#include <util.h> 48171176Smlaier#endif 49171176Smlaier 50171176Smlaierstatic char *pidfile_path; 51171176Smlaierstatic pid_t pidfile_pid; 52171176Smlaier 53171176Smlaierstatic void pidfile_cleanup(void); 54171176Smlaier 55171176Smlaierextern char *__progname; 56171176Smlaier 57171176Smlaierint 58171176Smlaierpidfile(const char *basename) 59171176Smlaier{ 60171176Smlaier FILE *f; 61171176Smlaier int save_errno; 62171176Smlaier pid_t pid; 63171176Smlaier 64171176Smlaier if (basename == NULL) 65171176Smlaier basename = __progname; 66171176Smlaier 67171176Smlaier if (pidfile_path != NULL) { 68171176Smlaier free(pidfile_path); 69171176Smlaier pidfile_path = NULL; 70171176Smlaier } 71171176Smlaier 72171176Smlaier /* _PATH_VARRUN includes trailing / */ 73171176Smlaier (void) asprintf(&pidfile_path, "%s%s.pid", _PATH_VARRUN, basename); 74171176Smlaier if (pidfile_path == NULL) 75171176Smlaier return (-1); 76171176Smlaier 77171176Smlaier if ((f = fopen(pidfile_path, "w")) == NULL) { 78171176Smlaier save_errno = errno; 79171176Smlaier free(pidfile_path); 80171176Smlaier pidfile_path = NULL; 81171176Smlaier errno = save_errno; 82171176Smlaier return (-1); 83171176Smlaier } 84171176Smlaier 85171176Smlaier pid = getpid(); 86171176Smlaier if (fprintf(f, "%ld\n", (long)pid) <= 0 || fclose(f) != 0) { 87171176Smlaier save_errno = errno; 88171176Smlaier (void) unlink(pidfile_path); 89171176Smlaier free(pidfile_path); 90171176Smlaier pidfile_path = NULL; 91171176Smlaier errno = save_errno; 92171176Smlaier return (-1); 93171176Smlaier } 94171176Smlaier 95171176Smlaier pidfile_pid = pid; 96171176Smlaier if (atexit(pidfile_cleanup) < 0) { 97171176Smlaier save_errno = errno; 98171176Smlaier (void) unlink(pidfile_path); 99171176Smlaier free(pidfile_path); 100171176Smlaier pidfile_path = NULL; 101171176Smlaier pidfile_pid = 0; 102171176Smlaier errno = save_errno; 103171176Smlaier return (-1); 104171176Smlaier } 105171176Smlaier 106171176Smlaier return (0); 107171176Smlaier} 108171176Smlaier 109171176Smlaierstatic void 110171176Smlaierpidfile_cleanup(void) 111171176Smlaier{ 112171176Smlaier 113171176Smlaier if (pidfile_path != NULL && pidfile_pid == getpid()) 114171176Smlaier (void) unlink(pidfile_path); 115171176Smlaier} 116