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/* $OpenBSD: pidfile.c,v 1.14 2019/06/28 14:20:40 schwarze Exp $ */
/* $NetBSD: pidfile.c,v 1.4 2001/02/19 22:43:42 cgd 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.
*
* 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>
#include <sys/types.h>
#include <errno.h>
#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <util.h>
static char *pidfile_path;
static pid_t pidfile_pid;
static void pidfile_cleanup(void);
extern char *__progname;
int
pidfile(const char *basename)
{
int save_errno;
pid_t pid;
FILE *f;
if (basename == NULL)
basename = __progname;
free(pidfile_path);
pidfile_path = NULL;
/* _PATH_VARRUN includes trailing / */
if (asprintf(&pidfile_path, "%s%s.pid", _PATH_VARRUN, basename) == -1)
return (-1);
if ((f = fopen(pidfile_path, "w")) == NULL) {
save_errno = errno;
free(pidfile_path);
pidfile_path = NULL;
errno = save_errno;
return (-1);
}
pid = getpid();
if (fprintf(f, "%ld\n", (long)pid) <= 0 || fflush(f) != 0) {
save_errno = errno;
(void) fclose(f);
(void) unlink(pidfile_path);
free(pidfile_path);
pidfile_path = NULL;
errno = save_errno;
return (-1);
}
(void) fclose(f);
pidfile_pid = pid;
if (atexit(pidfile_cleanup) != 0) {
save_errno = errno;
(void) unlink(pidfile_path);
free(pidfile_path);
pidfile_path = NULL;
pidfile_pid = 0;
errno = save_errno;
return (-1);
}
return (0);
}
static void
pidfile_cleanup(void)
{
if (pidfile_path != NULL && pidfile_pid == getpid())
(void) unlink(pidfile_path);
}
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