write_pid.c revision 302408 
1/*
2 * Copyright (c) 1999 - 2001 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#include <config.h>
35
36#include "roken.h"
37
38ROKEN_LIB_FUNCTION char * ROKEN_LIB_CALL
39pid_file_write (const char *progname)
40{
41    char *ret = NULL;
42    FILE *fp;
43
44    if (asprintf (&ret, "%s%s.pid", _PATH_VARRUN, progname) < 0 || ret == NULL)
45	return NULL;
46    fp = fopen (ret, "w");
47    if (fp == NULL) {
48	free (ret);
49	return NULL;
50    }
51    fprintf (fp, "%u", (unsigned)getpid());
52    fclose (fp);
53    return ret;
54}
55
56ROKEN_LIB_FUNCTION void ROKEN_LIB_CALL
57pid_file_delete (char **filename)
58{
59    if (*filename != NULL) {
60	unlink (*filename);
61	free (*filename);
62	*filename = NULL;
63    }
64}
65
66#ifndef HAVE_PIDFILE
67static char *pidfile_path;
68
69static void
70pidfile_cleanup(void)
71{
72    if(pidfile_path != NULL)
73	pid_file_delete(&pidfile_path);
74}
75
76ROKEN_LIB_FUNCTION void ROKEN_LIB_CALL
77pidfile(const char *basename)
78{
79    if(pidfile_path != NULL)
80	return;
81    if(basename == NULL)
82	basename = getprogname();
83    pidfile_path = pid_file_write(basename);
84#if defined(HAVE_ATEXIT)
85    atexit(pidfile_cleanup);
86#elif defined(HAVE_ON_EXIT)
87    on_exit(pidfile_cleanup);
88#endif
89}
90#endif
91