1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2006 David Xu <[email protected]>
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 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 #include <sys/types.h>
31 #include <sys/syscall.h>
32 #include <sys/mqueue.h>
33
34 #include "namespace.h"
35 #include <errno.h>
36 #include <pthread.h>
37 #include <stddef.h>
38 #include <stdlib.h>
39 #include <signal.h>
40 #include "sigev_thread.h"
41 #include "un-namespace.h"
42 #include "libc_private.h"
43
44 extern int __sys_kmq_notify(int, const struct sigevent *);
45 extern int __sys_kmq_open(const char *, int, mode_t,
46 const struct mq_attr *);
47 extern int __sys_kmq_setattr(int, const struct mq_attr *__restrict,
48 struct mq_attr *__restrict);
49 extern ssize_t __sys_kmq_timedreceive(int, char *__restrict, size_t,
50 unsigned *__restrict, const struct timespec *__restrict);
51 extern int __sys_kmq_timedsend(int, const char *, size_t, unsigned,
52 const struct timespec *);
53 extern int __sys_kmq_unlink(const char *);
54 extern int __sys_close(int fd);
55
56 struct __mq {
57 int oshandle;
58 struct sigev_node *node;
59 };
60
61 __weak_reference(__mq_open, mq_open);
62 __weak_reference(__mq_open, _mq_open);
63 __weak_reference(__mq_close, mq_close);
64 __weak_reference(__mq_close, _mq_close);
65 __weak_reference(__mq_notify, mq_notify);
66 __weak_reference(__mq_notify, _mq_notify);
67 __weak_reference(__mq_getattr, mq_getattr);
68 __weak_reference(__mq_getattr, _mq_getattr);
69 __weak_reference(__mq_setattr, mq_setattr);
70 __weak_reference(__mq_setattr, _mq_setattr);
71 __weak_reference(__mq_timedreceive_cancel, mq_timedreceive);
72 __weak_reference(__mq_timedreceive, _mq_timedreceive);
73 __weak_reference(__mq_timedsend_cancel, mq_timedsend);
74 __weak_reference(__mq_timedsend, _mq_timedsend);
75 __weak_reference(__mq_unlink, mq_unlink);
76 __weak_reference(__mq_unlink, _mq_unlink);
77 __weak_reference(__mq_send_cancel, mq_send);
78 __weak_reference(__mq_send, _mq_send);
79 __weak_reference(__mq_receive_cancel, mq_receive);
80 __weak_reference(__mq_receive, _mq_receive);
81
82 mqd_t
__mq_open(const char * name,int oflag,mode_t mode,const struct mq_attr * attr)83 __mq_open(const char *name, int oflag, mode_t mode,
84 const struct mq_attr *attr)
85 {
86 struct __mq *mq;
87 int err;
88
89 mq = malloc(sizeof(struct __mq));
90 if (mq == NULL)
91 return (NULL);
92
93 mq->oshandle = __sys_kmq_open(name, oflag, mode, attr);
94 if (mq->oshandle != -1) {
95 mq->node = NULL;
96 return (mq);
97 }
98 err = errno;
99 free(mq);
100 errno = err;
101 return ((mqd_t)-1L);
102 }
103
104 int
__mq_close(mqd_t mqd)105 __mq_close(mqd_t mqd)
106 {
107 int h;
108
109 if (mqd->node != NULL) {
110 __sigev_list_lock();
111 __sigev_delete_node(mqd->node);
112 __sigev_list_unlock();
113 }
114 h = mqd->oshandle;
115 free(mqd);
116 return (__sys_close(h));
117 }
118
119 typedef void (*mq_func)(union sigval val);
120
121 static void
mq_dispatch(struct sigev_node * sn)122 mq_dispatch(struct sigev_node *sn)
123 {
124 mq_func f = sn->sn_func;
125
126 /*
127 * Check generation before calling user function,
128 * this should avoid expired notification.
129 */
130 if (sn->sn_gen == sn->sn_info.si_value.sival_int)
131 f(sn->sn_value);
132 }
133
134 int
__mq_notify(mqd_t mqd,const struct sigevent * evp)135 __mq_notify(mqd_t mqd, const struct sigevent *evp)
136 {
137 struct sigevent ev;
138 struct sigev_node *sn;
139 int ret;
140
141 if (evp == NULL || evp->sigev_notify != SIGEV_THREAD) {
142 if (mqd->node != NULL) {
143 __sigev_list_lock();
144 __sigev_delete_node(mqd->node);
145 mqd->node = NULL;
146 __sigev_list_unlock();
147 }
148 return __sys_kmq_notify(mqd->oshandle, evp);
149 }
150
151 if (__sigev_check_init()) {
152 /*
153 * Thread library is not enabled.
154 */
155 errno = EINVAL;
156 return (-1);
157 }
158
159 sn = __sigev_alloc(SI_MESGQ, evp, mqd->node, 1);
160 if (sn == NULL) {
161 errno = EAGAIN;
162 return (-1);
163 }
164
165 sn->sn_id = mqd->oshandle;
166 sn->sn_dispatch = mq_dispatch;
167 __sigev_get_sigevent(sn, &ev, sn->sn_gen);
168 __sigev_list_lock();
169 if (mqd->node != NULL)
170 __sigev_delete_node(mqd->node);
171 mqd->node = sn;
172 __sigev_register(sn);
173 ret = __sys_kmq_notify(mqd->oshandle, &ev);
174 __sigev_list_unlock();
175 return (ret);
176 }
177
178 int
__mq_getattr(mqd_t mqd,struct mq_attr * attr)179 __mq_getattr(mqd_t mqd, struct mq_attr *attr)
180 {
181
182 return __sys_kmq_setattr(mqd->oshandle, NULL, attr);
183 }
184
185 int
__mq_setattr(mqd_t mqd,const struct mq_attr * newattr,struct mq_attr * oldattr)186 __mq_setattr(mqd_t mqd, const struct mq_attr *newattr, struct mq_attr *oldattr)
187 {
188
189 return __sys_kmq_setattr(mqd->oshandle, newattr, oldattr);
190 }
191
192 ssize_t
__mq_timedreceive(mqd_t mqd,char * buf,size_t len,unsigned * prio,const struct timespec * timeout)193 __mq_timedreceive(mqd_t mqd, char *buf, size_t len,
194 unsigned *prio, const struct timespec *timeout)
195 {
196
197 return __sys_kmq_timedreceive(mqd->oshandle, buf, len, prio, timeout);
198 }
199
200 ssize_t
__mq_timedreceive_cancel(mqd_t mqd,char * buf,size_t len,unsigned * prio,const struct timespec * timeout)201 __mq_timedreceive_cancel(mqd_t mqd, char *buf, size_t len,
202 unsigned *prio, const struct timespec *timeout)
203 {
204 int ret;
205
206 _pthread_cancel_enter(1);
207 ret = __sys_kmq_timedreceive(mqd->oshandle, buf, len, prio, timeout);
208 _pthread_cancel_leave(ret == -1);
209 return (ret);
210 }
211
212 ssize_t
__mq_receive(mqd_t mqd,char * buf,size_t len,unsigned * prio)213 __mq_receive(mqd_t mqd, char *buf, size_t len, unsigned *prio)
214 {
215
216 return __sys_kmq_timedreceive(mqd->oshandle, buf, len, prio, NULL);
217 }
218
219 ssize_t
__mq_receive_cancel(mqd_t mqd,char * buf,size_t len,unsigned * prio)220 __mq_receive_cancel(mqd_t mqd, char *buf, size_t len, unsigned *prio)
221 {
222 int ret;
223
224 _pthread_cancel_enter(1);
225 ret = __sys_kmq_timedreceive(mqd->oshandle, buf, len, prio, NULL);
226 _pthread_cancel_leave(ret == -1);
227 return (ret);
228 }
229 ssize_t
__mq_timedsend(mqd_t mqd,char * buf,size_t len,unsigned prio,const struct timespec * timeout)230 __mq_timedsend(mqd_t mqd, char *buf, size_t len,
231 unsigned prio, const struct timespec *timeout)
232 {
233
234 return __sys_kmq_timedsend(mqd->oshandle, buf, len, prio, timeout);
235 }
236
237 ssize_t
__mq_timedsend_cancel(mqd_t mqd,char * buf,size_t len,unsigned prio,const struct timespec * timeout)238 __mq_timedsend_cancel(mqd_t mqd, char *buf, size_t len,
239 unsigned prio, const struct timespec *timeout)
240 {
241 int ret;
242
243 _pthread_cancel_enter(1);
244 ret = __sys_kmq_timedsend(mqd->oshandle, buf, len, prio, timeout);
245 _pthread_cancel_leave(ret == -1);
246 return (ret);
247 }
248
249 ssize_t
__mq_send(mqd_t mqd,char * buf,size_t len,unsigned prio)250 __mq_send(mqd_t mqd, char *buf, size_t len, unsigned prio)
251 {
252
253 return __sys_kmq_timedsend(mqd->oshandle, buf, len, prio, NULL);
254 }
255
256
257 ssize_t
__mq_send_cancel(mqd_t mqd,char * buf,size_t len,unsigned prio)258 __mq_send_cancel(mqd_t mqd, char *buf, size_t len, unsigned prio)
259 {
260 int ret;
261
262 _pthread_cancel_enter(1);
263 ret = __sys_kmq_timedsend(mqd->oshandle, buf, len, prio, NULL);
264 _pthread_cancel_leave(ret == -1);
265 return (ret);
266 }
267
268 int
__mq_unlink(const char * path)269 __mq_unlink(const char *path)
270 {
271
272 return __sys_kmq_unlink(path);
273 }
274
275 #pragma weak mq_getfd_np
276 int
mq_getfd_np(mqd_t mqd)277 mq_getfd_np(mqd_t mqd)
278 {
279
280 return (mqd->oshandle);
281 }
282