1 |
|
|
/* $OpenBSD: pidfile.c,v 1.12 2015/11/27 01:57:59 mmcc Exp $ */ |
2 |
|
|
/* $NetBSD: pidfile.c,v 1.4 2001/02/19 22:43:42 cgd Exp $ */ |
3 |
|
|
|
4 |
|
|
/*- |
5 |
|
|
* Copyright (c) 1999 The NetBSD Foundation, Inc. |
6 |
|
|
* All rights reserved. |
7 |
|
|
* |
8 |
|
|
* This code is derived from software contributed to The NetBSD Foundation |
9 |
|
|
* by Jason R. Thorpe. |
10 |
|
|
* |
11 |
|
|
* Redistribution and use in source and binary forms, with or without |
12 |
|
|
* modification, are permitted provided that the following conditions |
13 |
|
|
* are met: |
14 |
|
|
* 1. Redistributions of source code must retain the above copyright |
15 |
|
|
* notice, this list of conditions and the following disclaimer. |
16 |
|
|
* 2. Redistributions in binary form must reproduce the above copyright |
17 |
|
|
* notice, this list of conditions and the following disclaimer in the |
18 |
|
|
* documentation and/or other materials provided with the distribution. |
19 |
|
|
* |
20 |
|
|
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
21 |
|
|
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
22 |
|
|
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
23 |
|
|
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
24 |
|
|
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
25 |
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
26 |
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
27 |
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
28 |
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
29 |
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
30 |
|
|
* POSSIBILITY OF SUCH DAMAGE. |
31 |
|
|
*/ |
32 |
|
|
|
33 |
|
|
#include <sys/types.h> |
34 |
|
|
#include <errno.h> |
35 |
|
|
#include <paths.h> |
36 |
|
|
#include <stdio.h> |
37 |
|
|
#include <stdlib.h> |
38 |
|
|
#include <unistd.h> |
39 |
|
|
#include <util.h> |
40 |
|
|
|
41 |
|
|
static char *pidfile_path; |
42 |
|
|
static pid_t pidfile_pid; |
43 |
|
|
|
44 |
|
|
static void pidfile_cleanup(void); |
45 |
|
|
|
46 |
|
|
extern char *__progname; |
47 |
|
|
|
48 |
|
|
int |
49 |
|
|
pidfile(const char *basename) |
50 |
|
|
{ |
51 |
|
|
int save_errno; |
52 |
|
|
pid_t pid; |
53 |
|
|
FILE *f; |
54 |
|
|
|
55 |
|
|
if (basename == NULL) |
56 |
|
|
basename = __progname; |
57 |
|
|
|
58 |
|
|
free(pidfile_path); |
59 |
|
|
pidfile_path = NULL; |
60 |
|
|
|
61 |
|
|
/* _PATH_VARRUN includes trailing / */ |
62 |
|
|
if (asprintf(&pidfile_path, "%s%s.pid", _PATH_VARRUN, basename) == -1) |
63 |
|
|
return (-1); |
64 |
|
|
|
65 |
|
|
if ((f = fopen(pidfile_path, "w")) == NULL) { |
66 |
|
|
save_errno = errno; |
67 |
|
|
free(pidfile_path); |
68 |
|
|
pidfile_path = NULL; |
69 |
|
|
errno = save_errno; |
70 |
|
|
return (-1); |
71 |
|
|
} |
72 |
|
|
|
73 |
|
|
pid = getpid(); |
74 |
|
|
if (fprintf(f, "%ld\n", (long)pid) <= 0 || fflush(f) != 0) { |
75 |
|
|
save_errno = errno; |
76 |
|
|
(void) fclose(f); |
77 |
|
|
(void) unlink(pidfile_path); |
78 |
|
|
free(pidfile_path); |
79 |
|
|
pidfile_path = NULL; |
80 |
|
|
errno = save_errno; |
81 |
|
|
return (-1); |
82 |
|
|
} |
83 |
|
|
(void) fclose(f); |
84 |
|
|
|
85 |
|
|
pidfile_pid = pid; |
86 |
|
|
if (atexit(pidfile_cleanup) < 0) { |
87 |
|
|
save_errno = errno; |
88 |
|
|
(void) unlink(pidfile_path); |
89 |
|
|
free(pidfile_path); |
90 |
|
|
pidfile_path = NULL; |
91 |
|
|
pidfile_pid = 0; |
92 |
|
|
errno = save_errno; |
93 |
|
|
return (-1); |
94 |
|
|
} |
95 |
|
|
|
96 |
|
|
return (0); |
97 |
|
|
} |
98 |
|
|
|
99 |
|
|
static void |
100 |
|
|
pidfile_cleanup(void) |
101 |
|
|
{ |
102 |
|
|
|
103 |
|
|
if (pidfile_path != NULL && pidfile_pid == getpid()) |
104 |
|
|
(void) unlink(pidfile_path); |
105 |
|
|
} |