pidfile.c revision 1.1
1/* $OpenBSD: pidfile.c,v 1.1 2001/09/28 20:16:42 jakob Exp $ */ 2/* $NetBSD: pidfile.c,v 1.4 2001/02/19 22:43:42 cgd Exp $ */ 3 4/*- 5 * Copyright (c) 1999 The NetBSD Foundation, Inc. 6 * All rights reserved. 7 * 8 * This code is derived from software contributed to The NetBSD Foundation 9 * by Jason R. Thorpe. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the NetBSD 22 * Foundation, Inc. and its contributors. 23 * 4. Neither the name of The NetBSD Foundation nor the names of its 24 * contributors may be used to endorse or promote products derived 25 * from this software without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 28 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 37 * POSSIBILITY OF SUCH DAMAGE. 38 */ 39 40#if defined(LIBC_SCCS) && !defined(lint) 41static const char rcsid[] = "$OpenBSD: pidfile.c,v 1.1 2001/09/28 20:16:42 jakob Exp $"; 42#endif /* LIBC_SCCS and not lint */ 43 44#include <sys/param.h> 45#include <errno.h> 46#include <paths.h> 47#include <stdio.h> 48#include <stdlib.h> 49#include <unistd.h> 50#include <util.h> 51 52static char *pidfile_path; 53 54static void pidfile_cleanup(void); 55 56extern char *__progname; 57 58int 59pidfile(const char *basename) 60{ 61 FILE *f; 62 int save_errno; 63 64 if (basename == NULL) 65 basename = __progname; 66 67 if (pidfile_path != NULL) { 68 free(pidfile_path); 69 pidfile_path = NULL; 70 } 71 72 /* _PATH_VARRUN includes trailing / */ 73 (void) asprintf(&pidfile_path, "%s%s.pid", _PATH_VARRUN, basename); 74 if (pidfile_path == NULL) 75 return (-1); 76 77 if ((f = fopen(pidfile_path, "w")) == NULL) { 78 save_errno = errno; 79 free(pidfile_path); 80 pidfile_path = NULL; 81 errno = save_errno; 82 return (-1); 83 } 84 85 if (fprintf(f, "%d\n", getpid()) <= 0 || fclose(f) != 0) { 86 save_errno = errno; 87 (void) unlink(pidfile_path); 88 free(pidfile_path); 89 pidfile_path = NULL; 90 errno = save_errno; 91 return (-1); 92 } 93 94 (void) atexit(pidfile_cleanup); 95 96 return (0); 97} 98 99static void 100pidfile_cleanup(void) 101{ 102 103 if (pidfile_path != NULL) 104 (void) unlink(pidfile_path); 105} 106