1 /* $NetBSD: pidfile.c,v 1.3 2000/07/05 11:46:41 ad Exp $ */ 2 3 /*- 4 * Copyright (c) 1999 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 #include <sys/cdefs.h> 40 #if defined(LIBC_SCCS) && !defined(lint) 41 __RCSID("$NetBSD: pidfile.c,v 1.3 2000/07/05 11:46:41 ad Exp $"); 42 #endif 43 44 #include <sys/param.h> 45 #include <paths.h> 46 #include <stdlib.h> 47 #include <stdio.h> 48 #include <unistd.h> 49 #include <util.h> 50 51 static char *pidfile_path; 52 53 static void pidfile_cleanup(void); 54 55 extern const char *__progname; /* from crt0.o */ 56 57 void 58 pidfile(const char *basename) 59 { 60 FILE *f; 61 62 if (pidfile_path != NULL) 63 return; 64 65 if (basename == NULL) 66 basename = __progname; 67 68 /* _PATH_VARRUN includes trailing / */ 69 (void) asprintf(&pidfile_path, "%s%s.pid", _PATH_VARRUN, basename); 70 if (pidfile_path == NULL) 71 return; 72 73 if ((f = fopen(pidfile_path, "w")) == NULL) 74 return; 75 76 (void) fprintf(f, "%d\n", getpid()); 77 (void) fclose(f); 78 79 (void) atexit(pidfile_cleanup); 80 } 81 82 static void 83 pidfile_cleanup(void) 84 { 85 86 if (pidfile_path != NULL) 87 (void) unlink(pidfile_path); 88 } 89