106 lines
2.9 KiB
C
106 lines
2.9 KiB
C
/* $OpenBSD: pidfile.c,v 1.14 2019/06/28 14:20:40 schwarze Exp $ */
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/* $NetBSD: pidfile.c,v 1.4 2001/02/19 22:43:42 cgd Exp $ */
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/*-
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* Copyright (c) 1999 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Jason R. Thorpe.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/types.h>
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#include <errno.h>
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#include <paths.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <util.h>
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static char *pidfile_path;
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static pid_t pidfile_pid;
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static void pidfile_cleanup(void);
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extern char *__progname;
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int
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pidfile(const char *basename)
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{
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int save_errno;
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pid_t pid;
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FILE *f;
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if (basename == NULL)
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basename = __progname;
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free(pidfile_path);
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pidfile_path = NULL;
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/* _PATH_VARRUN includes trailing / */
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if (asprintf(&pidfile_path, "%s%s.pid", _PATH_VARRUN, basename) == -1)
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return (-1);
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if ((f = fopen(pidfile_path, "w")) == NULL) {
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save_errno = errno;
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free(pidfile_path);
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pidfile_path = NULL;
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errno = save_errno;
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return (-1);
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}
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pid = getpid();
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if (fprintf(f, "%ld\n", (long)pid) <= 0 || fflush(f) != 0) {
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save_errno = errno;
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(void) fclose(f);
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(void) unlink(pidfile_path);
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free(pidfile_path);
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pidfile_path = NULL;
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errno = save_errno;
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return (-1);
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}
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(void) fclose(f);
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pidfile_pid = pid;
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if (atexit(pidfile_cleanup) != 0) {
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save_errno = errno;
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(void) unlink(pidfile_path);
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free(pidfile_path);
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pidfile_path = NULL;
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pidfile_pid = 0;
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errno = save_errno;
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return (-1);
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}
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return (0);
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}
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static void
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pidfile_cleanup(void)
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{
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if (pidfile_path != NULL && pidfile_pid == getpid())
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(void) unlink(pidfile_path);
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}
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