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pidfile.c revision 1.2 
      1 /*	$NetBSD: pidfile.c,v 1.2 1999/06/06 17:31:09 thorpej 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 1.2 1999/06/06 17:31:09 thorpej 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 __P((void));
     54 
     55 extern const char *__progname;		/* from crt0.o */
     56 
     57 void
     58 pidfile(basename)
     59 	const char *basename;
     60 {
     61 	FILE *f;
     62 
     63 	if (pidfile_path != NULL)
     64 		return;
     65 
     66 	if (basename == NULL)
     67 		basename = __progname;
     68 
     69 	/* _PATH_VARRUN includes trailing / */
     70 	(void) asprintf(&pidfile_path, "%s%s.pid", _PATH_VARRUN, basename);
     71 	if (pidfile_path == NULL)
     72 		return;
     73 
     74 	if ((f = fopen(pidfile_path, "w")) == NULL)
     75 		return;
     76 
     77 	(void) fprintf(f, "%d\n", getpid());
     78 	(void) fclose(f);
     79 
     80 	(void) atexit(pidfile_cleanup);
     81 }
     82 
     83 static void
     84 pidfile_cleanup()
     85 {
     86 
     87 	if (pidfile_path != NULL)
     88 		(void) unlink(pidfile_path);
     89 }
     90