minix/lib/libutil/pidfile.c
Ben Gras 0c3983b25a update/fix manpage support
. add bsd-style MLINKS to minix man set, restoring aliases
	  (e.g. man add64 -> int64)
	. update daily cron script to run makewhatis and restore makewhatis
	  in man Makefile (makedb), restores functionality of man -k
	. netbsd imports of man, mdocml, makewhatis, libutil, apropos
	. update man.conf with manpage locations, restoring man [-s] <section>
	. throws out some obsolete manpages
2011-09-28 15:24:15 +00:00

120 lines
3.4 KiB
C

/* $NetBSD: pidfile.c,v 1.8 2008/04/28 20:23:03 martin Exp $ */
/*-
* Copyright (c) 1999 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe and Matthias Scheler.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: pidfile.c,v 1.8 2008/04/28 20:23:03 martin Exp $");
#endif
#include <sys/param.h>
#include <paths.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <util.h>
static int pidfile_atexit_done;
static pid_t pidfile_pid;
static char *pidfile_basename;
static char *pidfile_path;
static void pidfile_cleanup(void);
int
pidfile(const char *basename)
{
FILE *f;
/*
* Register handler which will remove the pidfile later.
*/
if (!pidfile_atexit_done) {
if (atexit(pidfile_cleanup) < 0)
return -1;
pidfile_atexit_done = 1;
}
if (basename == NULL)
basename = getprogname();
/*
* If pidfile has already been created for the supplied basename
* we don't need to create a pidfile again.
*/
if (pidfile_path != NULL) {
if (strcmp(pidfile_basename, basename) == 0)
return 0;
/*
* Remove existing pidfile if it was created by this process.
*/
pidfile_cleanup();
free(pidfile_path);
pidfile_path = NULL;
free(pidfile_basename);
pidfile_basename = NULL;
}
pidfile_pid = getpid();
pidfile_basename = strdup(basename);
if (pidfile_basename == NULL)
return -1;
/* _PATH_VARRUN includes trailing / */
(void) asprintf(&pidfile_path, "%s%s.pid", _PATH_VARRUN, basename);
if (pidfile_path == NULL) {
free(pidfile_basename);
pidfile_basename = NULL;
return -1;
}
if ((f = fopen(pidfile_path, "w")) == NULL) {
free(pidfile_path);
pidfile_path = NULL;
free(pidfile_basename);
pidfile_basename = NULL;
return -1;
}
(void) fprintf(f, "%d\n", pidfile_pid);
(void) fclose(f);
return 0;
}
static void
pidfile_cleanup(void)
{
/* Only remove the pidfile if it was created by this process. */
if ((pidfile_path != NULL) && (pidfile_pid == getpid()))
(void) unlink(pidfile_path);
}