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path: root/libetpan/src/data-types/mailsem.c
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1/*
2 * libEtPan! -- a mail stuff library
3 *
4 * Copyright (C) 2001, 2005 - DINH Viet Hoa
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the libEtPan! project nor the names of its
16 * contributors may be used to endorse or promote products derived
17 * from this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32/*
33 * $Id$
34 */
35
36#include "mailsem.h"
37#include <semaphore.h>
38#include <stdlib.h>
39#include <stdio.h>
40#include <sys/stat.h>
41#include <sys/types.h>
42#include <fcntl.h>
43
44enum {
45 SEMKIND_SEMOPEN,
46 SEMKIND_SEMINIT,
47};
48
49#define SEMNAME_LEN 64
50
51struct mailsem * mailsem_new(void)
52{
53 struct mailsem * sem;
54 int r;
55
56 sem = malloc(sizeof(* sem));
57 if (sem == NULL)
58 goto err;
59
60 r = sem_init(sem->sem_sem, 0, 0);
61 if (r < 0) {
62 char name[SEMNAME_LEN];
63
64 free(sem->sem_sem);
65
66 snprintf(name, sizeof(name), "sem-%p", sem);
67
68#ifndef __CYGWIN__
69 sem->sem_sem = sem_open(name, O_CREAT, 0600, 0);
70 if (sem->sem_sem == NULL)
71 goto err;
72
73 sem->sem_kind = SEMKIND_SEMOPEN;
74#else
75 goto err;
76#endif
77 }
78 else {
79 sem->sem_kind = SEMKIND_SEMINIT;
80 }
81
82 return sem;
83
84 err:
85 return NULL;
86}
87
88void mailsem_free(struct mailsem * sem)
89{
90 if (sem->sem_kind == SEMKIND_SEMOPEN) {
91 char name[SEMNAME_LEN];
92
93#ifndef __CYGWIN__
94 sem_close((sem_t *) sem->sem_sem);
95 snprintf(name, sizeof(name), "sem-%p", sem);
96 sem_unlink(name);
97#endif
98 }
99 else {
100 sem_destroy((sem_t *) sem->sem_sem);
101 free(sem->sem_sem);
102 }
103 free(sem);
104}
105
106int mailsem_up(struct mailsem * sem)
107{
108 return sem_wait((sem_t *) sem->sem_sem);
109}
110
111int mailsem_down(struct mailsem * sem)
112{
113 return sem_post((sem_t *) sem->sem_sem);
114}