write_pid.c revision 72445 
1/*
2 * Copyright (c) 1999 - 2000 Kungliga Tekniska H�gskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * 3. Neither the name of the Institute nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifdef HAVE_CONFIG_H
35#include <config.h>
36RCSID("$Id: write_pid.c,v 1.4 2000/08/04 11:19:41 joda Exp $");
37#endif
38
39#include <stdio.h>
40#include <sys/types.h>
41#include <unistd.h>
42#include <roken.h>
43
44#include "roken.h"
45
46char *
47pid_file_write (const char *progname)
48{
49    FILE *fp;
50    char *ret;
51
52    asprintf (&ret, "%s%s.pid", _PATH_VARRUN, progname);
53    if (ret == NULL)
54	return NULL;
55    fp = fopen (ret, "w");
56    if (fp == NULL) {
57	free (ret);
58	return NULL;
59    }
60    fprintf (fp, "%u", (unsigned)getpid());
61    fclose (fp);
62    return ret;
63}
64
65void
66pid_file_delete (char **filename)
67{
68    if (*filename != NULL) {
69	unlink (*filename);
70	free (*filename);
71	*filename = NULL;
72    }
73}
74
75#ifndef HAVE_PIDFILE
76static char *pidfile_path;
77
78static void
79pidfile_cleanup(void)
80{
81    if(pidfile_path != NULL)
82	pid_file_delete(&pidfile_path);
83}
84
85void
86pidfile(const char *basename)
87{
88    if(pidfile_path != NULL)
89	return;
90    if(basename == NULL)
91	basename = __progname;
92    pidfile_path = pid_file_write(basename);
93    atexit(pidfile_cleanup);
94}
95#endif
96