sys_mqueue.c revision 1.1 1 1.1 rmind /* $NetBSD: sys_mqueue.c,v 1.1 2007/09/07 18:56:09 rmind Exp $ */
2 1.1 rmind
3 1.1 rmind /*
4 1.1 rmind * Copyright (c) 2007, Mindaugas Rasiukevicius <rmind at NetBSD org>
5 1.1 rmind *
6 1.1 rmind * Redistribution and use in source and binary forms, with or without
7 1.1 rmind * modification, are permitted provided that the following conditions
8 1.1 rmind * are met:
9 1.1 rmind * 1. Redistributions of source code must retain the above copyright
10 1.1 rmind * notice, this list of conditions and the following disclaimer.
11 1.1 rmind * 2. Redistributions in binary form must reproduce the above copyright
12 1.1 rmind * notice, this list of conditions and the following disclaimer in the
13 1.1 rmind * documentation and/or other materials provided with the distribution.
14 1.1 rmind *
15 1.1 rmind * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 1.1 rmind * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
17 1.1 rmind * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
18 1.1 rmind * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
19 1.1 rmind * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
20 1.1 rmind * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
21 1.1 rmind * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
22 1.1 rmind * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
23 1.1 rmind * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
24 1.1 rmind * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
25 1.1 rmind * POSSIBILITY OF SUCH DAMAGE.
26 1.1 rmind */
27 1.1 rmind
28 1.1 rmind /*
29 1.1 rmind * Implementation of POSIX message queues.
30 1.1 rmind * Defined in the Base Definitions volume of IEEE Std 1003.1-2001.
31 1.1 rmind *
32 1.1 rmind * Locking
33 1.1 rmind * Global list of message queues and proc::p_mqueue_cnt counter are protected
34 1.1 rmind * by mqlist_mtx lock. Concrete message queue and its members are protected
35 1.1 rmind * by mqueue::mq_mtx.
36 1.1 rmind *
37 1.1 rmind * Lock order:
38 1.1 rmind * mqlist_mtx
39 1.1 rmind * -> mqueue::mq_mtx
40 1.1 rmind *
41 1.1 rmind * TODO:
42 1.1 rmind * - Hashing or RB-tree for the global list.
43 1.1 rmind * - Support for select(), poll() and perhaps kqueue().
44 1.1 rmind */
45 1.1 rmind
46 1.1 rmind #include <sys/cdefs.h>
47 1.1 rmind __KERNEL_RCSID(0, "$NetBSD: sys_mqueue.c,v 1.1 2007/09/07 18:56:09 rmind Exp $");
48 1.1 rmind
49 1.1 rmind #include <sys/param.h>
50 1.1 rmind #include <sys/types.h>
51 1.1 rmind
52 1.1 rmind #include <sys/condvar.h>
53 1.1 rmind #include <sys/errno.h>
54 1.1 rmind #include <sys/fcntl.h>
55 1.1 rmind #include <sys/file.h>
56 1.1 rmind #include <sys/filedesc.h>
57 1.1 rmind #include <sys/kauth.h>
58 1.1 rmind #include <sys/kernel.h>
59 1.1 rmind #include <sys/kmem.h>
60 1.1 rmind #include <sys/lwp.h>
61 1.1 rmind #include <sys/mqueue.h>
62 1.1 rmind #include <sys/mutex.h>
63 1.1 rmind #include <sys/pool.h>
64 1.1 rmind #include <sys/proc.h>
65 1.1 rmind #include <sys/queue.h>
66 1.1 rmind #include <sys/signal.h>
67 1.1 rmind #include <sys/signalvar.h>
68 1.1 rmind #include <sys/sysctl.h>
69 1.1 rmind #include <sys/syscallargs.h>
70 1.1 rmind #include <sys/systm.h>
71 1.1 rmind #include <sys/unistd.h>
72 1.1 rmind #include <sys/vnode.h>
73 1.1 rmind
74 1.1 rmind /* System-wide limits. */
75 1.1 rmind static u_int mq_open_max = MQ_OPEN_MAX;
76 1.1 rmind static u_int mq_prio_max = MQ_PRIO_MAX;
77 1.1 rmind
78 1.1 rmind static u_int mq_max_msgsize = 16 * MQ_DEF_MSGSIZE;
79 1.1 rmind static u_int mq_def_maxmsg = 32;
80 1.1 rmind
81 1.1 rmind static kmutex_t mqlist_mtx;
82 1.1 rmind static struct pool mqmsg_poll;
83 1.1 rmind static LIST_HEAD(, mqueue) mqueue_head;
84 1.1 rmind
85 1.1 rmind static int mq_close_fop(struct file *, struct lwp *);
86 1.1 rmind
87 1.1 rmind static const struct fileops mqops = {
88 1.1 rmind fbadop_read, fbadop_write, fbadop_ioctl, fnullop_fcntl, fnullop_poll,
89 1.1 rmind fbadop_stat, mq_close_fop, fnullop_kqfilter
90 1.1 rmind };
91 1.1 rmind
92 1.1 rmind /*
93 1.1 rmind * Initialize POSIX message queue subsystem.
94 1.1 rmind */
95 1.1 rmind void
96 1.1 rmind mqueue_sysinit(void)
97 1.1 rmind {
98 1.1 rmind
99 1.1 rmind pool_init(&mqmsg_poll, MQ_DEF_MSGSIZE, 0, 0, 0,
100 1.1 rmind "mqmsg_poll", &pool_allocator_nointr, IPL_NONE);
101 1.1 rmind mutex_init(&mqlist_mtx, MUTEX_DEFAULT, IPL_NONE);
102 1.1 rmind LIST_INIT(&mqueue_head);
103 1.1 rmind }
104 1.1 rmind
105 1.1 rmind /*
106 1.1 rmind * Free the message.
107 1.1 rmind */
108 1.1 rmind static void
109 1.1 rmind mqueue_freemsg(struct mq_msg *msg, const size_t size)
110 1.1 rmind {
111 1.1 rmind
112 1.1 rmind if (size > MQ_DEF_MSGSIZE)
113 1.1 rmind kmem_free(msg, size);
114 1.1 rmind else
115 1.1 rmind pool_put(&mqmsg_poll, msg);
116 1.1 rmind }
117 1.1 rmind
118 1.1 rmind /*
119 1.1 rmind * Destroy the message queue.
120 1.1 rmind */
121 1.1 rmind static void
122 1.1 rmind mqueue_destroy(struct mqueue *mq)
123 1.1 rmind {
124 1.1 rmind struct mq_msg *msg;
125 1.1 rmind
126 1.1 rmind while ((msg = TAILQ_FIRST(&mq->mq_head)) != NULL) {
127 1.1 rmind TAILQ_REMOVE(&mq->mq_head, msg, msg_queue);
128 1.1 rmind mqueue_freemsg(msg, sizeof(struct mq_msg) + msg->msg_len);
129 1.1 rmind }
130 1.1 rmind cv_destroy(&mq->mq_send_cv);
131 1.1 rmind cv_destroy(&mq->mq_recv_cv);
132 1.1 rmind mutex_destroy(&mq->mq_mtx);
133 1.1 rmind kmem_free(mq, sizeof(struct mqueue));
134 1.1 rmind }
135 1.1 rmind
136 1.1 rmind /*
137 1.1 rmind * Lookup for file name in general list of message queues.
138 1.1 rmind * => locks the message queue
139 1.1 rmind */
140 1.1 rmind static void *
141 1.1 rmind mqueue_lookup(char *name)
142 1.1 rmind {
143 1.1 rmind struct mqueue *mq;
144 1.1 rmind KASSERT(mutex_owned(&mqlist_mtx));
145 1.1 rmind
146 1.1 rmind LIST_FOREACH(mq, &mqueue_head, mq_list) {
147 1.1 rmind if (strncmp(mq->mq_name, name, MQ_NAMELEN) == 0) {
148 1.1 rmind mutex_enter(&mq->mq_mtx);
149 1.1 rmind return mq;
150 1.1 rmind }
151 1.1 rmind }
152 1.1 rmind
153 1.1 rmind return NULL;
154 1.1 rmind }
155 1.1 rmind
156 1.1 rmind /*
157 1.1 rmind * Check access against message queue.
158 1.1 rmind */
159 1.1 rmind static inline int
160 1.1 rmind mqueue_access(struct lwp *l, struct mqueue *mq, mode_t acc_mode)
161 1.1 rmind {
162 1.1 rmind
163 1.1 rmind KASSERT(mutex_owned(&mq->mq_mtx));
164 1.1 rmind return vaccess(VNON, mq->mq_mode, mq->mq_euid, mq->mq_egid,
165 1.1 rmind acc_mode, l->l_cred);
166 1.1 rmind }
167 1.1 rmind
168 1.1 rmind /*
169 1.1 rmind * Get the mqueue from the descriptor.
170 1.1 rmind * => locks the message queue
171 1.1 rmind * => increments the reference on file entry
172 1.1 rmind */
173 1.1 rmind static int
174 1.1 rmind mqueue_get(struct lwp *l, mqd_t mqd, mode_t acc_mode, struct file **fpr)
175 1.1 rmind {
176 1.1 rmind const struct proc *p = l->l_proc;
177 1.1 rmind struct file *fp;
178 1.1 rmind struct mqueue *mq;
179 1.1 rmind
180 1.1 rmind /* Get the file and descriptor */
181 1.1 rmind fp = fd_getfile(p->p_fd, (int)mqd);
182 1.1 rmind if (fp == NULL)
183 1.1 rmind return EBADF;
184 1.1 rmind
185 1.1 rmind /* Increment the reference of file entry, and lock the mqueue */
186 1.1 rmind FILE_USE(fp);
187 1.1 rmind mq = fp->f_data;
188 1.1 rmind *fpr = fp;
189 1.1 rmind mutex_enter(&mq->mq_mtx);
190 1.1 rmind
191 1.1 rmind /* Check the access mode and permission if needed */
192 1.1 rmind if (acc_mode == VNOVAL)
193 1.1 rmind return 0;
194 1.1 rmind if ((acc_mode & fp->f_flag) == 0 || mqueue_access(l, mq, acc_mode)) {
195 1.1 rmind mutex_exit(&mq->mq_mtx);
196 1.1 rmind FILE_UNUSE(fp, l);
197 1.1 rmind return EPERM;
198 1.1 rmind }
199 1.1 rmind
200 1.1 rmind return 0;
201 1.1 rmind }
202 1.1 rmind
203 1.1 rmind /*
204 1.1 rmind * Converter from struct timespec to the ticks.
205 1.1 rmind * Used by mq_timedreceive(), mq_timedsend().
206 1.1 rmind */
207 1.1 rmind static int
208 1.1 rmind abstimeout2timo(const void *uaddr, int *timo)
209 1.1 rmind {
210 1.1 rmind struct timespec ts;
211 1.1 rmind int error;
212 1.1 rmind
213 1.1 rmind error = copyin(uaddr, &ts, sizeof(struct timespec));
214 1.1 rmind if (error)
215 1.1 rmind return error;
216 1.1 rmind
217 1.1 rmind /*
218 1.1 rmind * According to POSIX, validation check is needed only in case of
219 1.1 rmind * blocking. Thus, set the invalid value right now, and fail latter.
220 1.1 rmind */
221 1.1 rmind error = itimespecfix(&ts);
222 1.1 rmind *timo = (error == 0) ? tstohz(&ts) : -1;
223 1.1 rmind
224 1.1 rmind return 0;
225 1.1 rmind }
226 1.1 rmind
227 1.1 rmind static int
228 1.1 rmind mq_close_fop(struct file *fp, struct lwp *l)
229 1.1 rmind {
230 1.1 rmind struct proc *p = l->l_proc;
231 1.1 rmind struct mqueue *mq = fp->f_data;
232 1.1 rmind bool destroy;
233 1.1 rmind
234 1.1 rmind mutex_enter(&mqlist_mtx);
235 1.1 rmind mutex_enter(&mq->mq_mtx);
236 1.1 rmind
237 1.1 rmind /* Decrease the counters */
238 1.1 rmind p->p_mqueue_cnt--;
239 1.1 rmind mq->mq_refcnt--;
240 1.1 rmind
241 1.1 rmind /* Remove notification if registered for this process */
242 1.1 rmind if (mq->mq_notify_proc == p)
243 1.1 rmind mq->mq_notify_proc = NULL;
244 1.1 rmind
245 1.1 rmind /*
246 1.1 rmind * If this is the last reference and mqueue is marked for unlink,
247 1.1 rmind * remove and later destroy the message queue.
248 1.1 rmind */
249 1.1 rmind if (mq->mq_refcnt == 0 && (mq->mq_attrib.mq_flags & MQ_UNLINK)) {
250 1.1 rmind LIST_REMOVE(mq, mq_list);
251 1.1 rmind destroy = true;
252 1.1 rmind } else
253 1.1 rmind destroy = false;
254 1.1 rmind
255 1.1 rmind mutex_exit(&mq->mq_mtx);
256 1.1 rmind mutex_exit(&mqlist_mtx);
257 1.1 rmind
258 1.1 rmind if (destroy)
259 1.1 rmind mqueue_destroy(mq);
260 1.1 rmind
261 1.1 rmind return 0;
262 1.1 rmind }
263 1.1 rmind
264 1.1 rmind /*
265 1.1 rmind * General mqueue system calls.
266 1.1 rmind */
267 1.1 rmind
268 1.1 rmind int
269 1.1 rmind sys_mq_open(struct lwp *l, void *v, register_t *retval)
270 1.1 rmind {
271 1.1 rmind struct sys_mq_open_args /* {
272 1.1 rmind syscallarg(const char *) name;
273 1.1 rmind syscallarg(int) oflag;
274 1.1 rmind syscallarg(mode_t) mode;
275 1.1 rmind syscallarg(struct mq_attr) attr;
276 1.1 rmind } */ *uap = v;
277 1.1 rmind struct proc *p = l->l_proc;
278 1.1 rmind struct mqueue *mq, *mq_new = NULL;
279 1.1 rmind struct file *fp;
280 1.1 rmind char *name;
281 1.1 rmind int mqd, error, oflag;
282 1.1 rmind
283 1.1 rmind /* Check access mode flags */
284 1.1 rmind oflag = SCARG(uap, oflag);
285 1.1 rmind if ((oflag & (O_RDWR | O_RDONLY | O_WRONLY)) == 0)
286 1.1 rmind return EINVAL;
287 1.1 rmind
288 1.1 rmind /* Get the name from the user-space */
289 1.1 rmind name = kmem_zalloc(MQ_NAMELEN, KM_SLEEP);
290 1.1 rmind error = copyinstr(SCARG(uap, name), name, MQ_NAMELEN - 1, NULL);
291 1.1 rmind if (error) {
292 1.1 rmind kmem_free(name, MQ_NAMELEN);
293 1.1 rmind return error;
294 1.1 rmind }
295 1.1 rmind
296 1.1 rmind if (oflag & O_CREAT) {
297 1.1 rmind struct mq_attr attr;
298 1.1 rmind
299 1.1 rmind /* Check the limit */
300 1.1 rmind if (p->p_mqueue_cnt == mq_open_max) {
301 1.1 rmind kmem_free(name, MQ_NAMELEN);
302 1.1 rmind return EMFILE;
303 1.1 rmind }
304 1.1 rmind
305 1.1 rmind /* Check for mqueue attributes */
306 1.1 rmind if (SCARG(uap, attr)) {
307 1.1 rmind error = copyin(SCARG(uap, attr), &attr,
308 1.1 rmind sizeof(struct mq_attr));
309 1.1 rmind if (error) {
310 1.1 rmind kmem_free(name, MQ_NAMELEN);
311 1.1 rmind return error;
312 1.1 rmind }
313 1.1 rmind if (attr.mq_maxmsg <= 0 || attr.mq_msgsize <= 0 ||
314 1.1 rmind attr.mq_msgsize > mq_max_msgsize) {
315 1.1 rmind kmem_free(name, MQ_NAMELEN);
316 1.1 rmind return EINVAL;
317 1.1 rmind }
318 1.1 rmind attr.mq_curmsgs = 0;
319 1.1 rmind } else {
320 1.1 rmind memset(&attr, 0, sizeof(struct mq_attr));
321 1.1 rmind attr.mq_maxmsg = mq_def_maxmsg;
322 1.1 rmind attr.mq_msgsize =
323 1.1 rmind MQ_DEF_MSGSIZE - sizeof(struct mq_msg);
324 1.1 rmind }
325 1.1 rmind
326 1.1 rmind /*
327 1.1 rmind * Allocate new mqueue, initialize data structures,
328 1.1 rmind * copy the name, attributes and set the flag.
329 1.1 rmind */
330 1.1 rmind mq_new = kmem_zalloc(sizeof(struct mqueue), KM_SLEEP);
331 1.1 rmind
332 1.1 rmind mutex_init(&mq_new->mq_mtx, MUTEX_DEFAULT, IPL_NONE);
333 1.1 rmind cv_init(&mq_new->mq_send_cv, "mqsendcv");
334 1.1 rmind cv_init(&mq_new->mq_recv_cv, "mqrecvcv");
335 1.1 rmind TAILQ_INIT(&mq_new->mq_head);
336 1.1 rmind
337 1.1 rmind strlcpy(mq_new->mq_name, name, MQ_NAMELEN);
338 1.1 rmind memcpy(&mq_new->mq_attrib, &attr, sizeof(struct mq_attr));
339 1.1 rmind mq_new->mq_attrib.mq_flags = oflag;
340 1.1 rmind
341 1.1 rmind /* Store mode and effective UID with GID */
342 1.1 rmind mq_new->mq_mode = SCARG(uap, mode);
343 1.1 rmind mq_new->mq_euid = kauth_cred_geteuid(l->l_cred);
344 1.1 rmind mq_new->mq_egid = kauth_cred_getegid(l->l_cred);
345 1.1 rmind }
346 1.1 rmind
347 1.1 rmind /* Allocate file structure and descriptor */
348 1.1 rmind error = falloc(l, &fp, &mqd);
349 1.1 rmind if (error) {
350 1.1 rmind if (mq_new)
351 1.1 rmind mqueue_destroy(mq_new);
352 1.1 rmind kmem_free(name, MQ_NAMELEN);
353 1.1 rmind return error;
354 1.1 rmind }
355 1.1 rmind fp->f_type = DTYPE_MQUEUE;
356 1.1 rmind fp->f_flag = (oflag & O_RDWR) ? (VREAD | VWRITE) :
357 1.1 rmind ((oflag & O_RDONLY) ? VREAD : VWRITE);
358 1.1 rmind fp->f_ops = &mqops;
359 1.1 rmind
360 1.1 rmind /* Look up for mqueue with such name */
361 1.1 rmind mutex_enter(&mqlist_mtx);
362 1.1 rmind mq = mqueue_lookup(name);
363 1.1 rmind if (mq) {
364 1.1 rmind KASSERT(mutex_owned(&mq->mq_mtx));
365 1.1 rmind /* Check if mqueue is not marked as unlinking */
366 1.1 rmind if (mq->mq_attrib.mq_flags & MQ_UNLINK) {
367 1.1 rmind error = EACCES;
368 1.1 rmind goto exit;
369 1.1 rmind }
370 1.1 rmind /* Fail if O_EXCL is set, and mqueue already exists */
371 1.1 rmind if ((oflag & O_CREAT) && (oflag & O_EXCL)) {
372 1.1 rmind error = EEXIST;
373 1.1 rmind goto exit;
374 1.1 rmind }
375 1.1 rmind /* Check the permission */
376 1.1 rmind if (mqueue_access(l, mq, fp->f_flag)) {
377 1.1 rmind error = EACCES;
378 1.1 rmind goto exit;
379 1.1 rmind }
380 1.1 rmind } else {
381 1.1 rmind /* Fail if mqueue neither exists, nor we create it */
382 1.1 rmind if ((oflag & O_CREAT) == 0) {
383 1.1 rmind mutex_exit(&mqlist_mtx);
384 1.1 rmind KASSERT(mq_new == NULL);
385 1.1 rmind FILE_UNUSE(fp, l);
386 1.1 rmind ffree(fp);
387 1.1 rmind fdremove(p->p_fd, mqd);
388 1.1 rmind kmem_free(name, MQ_NAMELEN);
389 1.1 rmind return ENOENT;
390 1.1 rmind }
391 1.1 rmind
392 1.1 rmind /* Check the limit */
393 1.1 rmind if (p->p_mqueue_cnt == mq_open_max) {
394 1.1 rmind error = EMFILE;
395 1.1 rmind goto exit;
396 1.1 rmind }
397 1.1 rmind
398 1.1 rmind /* Insert the queue to the list */
399 1.1 rmind mq = mq_new;
400 1.1 rmind mutex_enter(&mq->mq_mtx);
401 1.1 rmind LIST_INSERT_HEAD(&mqueue_head, mq, mq_list);
402 1.1 rmind mq_new = NULL;
403 1.1 rmind }
404 1.1 rmind
405 1.1 rmind /* Increase the counters, and make descriptor ready */
406 1.1 rmind p->p_mqueue_cnt++;
407 1.1 rmind mq->mq_refcnt++;
408 1.1 rmind fp->f_data = mq;
409 1.1 rmind FILE_SET_MATURE(fp);
410 1.1 rmind exit:
411 1.1 rmind mutex_exit(&mq->mq_mtx);
412 1.1 rmind mutex_exit(&mqlist_mtx);
413 1.1 rmind FILE_UNUSE(fp, l);
414 1.1 rmind
415 1.1 rmind if (mq_new)
416 1.1 rmind mqueue_destroy(mq_new);
417 1.1 rmind if (error) {
418 1.1 rmind ffree(fp);
419 1.1 rmind fdremove(p->p_fd, mqd);
420 1.1 rmind } else
421 1.1 rmind *retval = mqd;
422 1.1 rmind kmem_free(name, MQ_NAMELEN);
423 1.1 rmind
424 1.1 rmind return error;
425 1.1 rmind }
426 1.1 rmind
427 1.1 rmind int
428 1.1 rmind sys_mq_close(struct lwp *l, void *v, register_t *retval)
429 1.1 rmind {
430 1.1 rmind
431 1.1 rmind return sys_close(l, v, retval);
432 1.1 rmind }
433 1.1 rmind
434 1.1 rmind /*
435 1.1 rmind * Primary mq_receive1() function.
436 1.1 rmind */
437 1.1 rmind static int
438 1.1 rmind mq_receive1(struct lwp *l, mqd_t mqdes, void *msg_ptr, size_t msg_len,
439 1.1 rmind unsigned *msg_prio, int t, ssize_t *mlen)
440 1.1 rmind {
441 1.1 rmind struct file *fp = NULL;
442 1.1 rmind struct mqueue *mq;
443 1.1 rmind struct mq_msg *msg = NULL;
444 1.1 rmind int error;
445 1.1 rmind
446 1.1 rmind /* Get the message queue */
447 1.1 rmind error = mqueue_get(l, mqdes, VREAD, &fp);
448 1.1 rmind if (error)
449 1.1 rmind return error;
450 1.1 rmind mq = fp->f_data;
451 1.1 rmind
452 1.1 rmind /* Check the message size limits */
453 1.1 rmind if (msg_len < mq->mq_attrib.mq_msgsize) {
454 1.1 rmind error = EMSGSIZE;
455 1.1 rmind goto error;
456 1.1 rmind }
457 1.1 rmind
458 1.1 rmind /* Check if queue is empty */
459 1.1 rmind if (TAILQ_EMPTY(&mq->mq_head)) {
460 1.1 rmind if (mq->mq_attrib.mq_flags & O_NONBLOCK) {
461 1.1 rmind error = EAGAIN;
462 1.1 rmind goto error;
463 1.1 rmind }
464 1.1 rmind if (t < 0) {
465 1.1 rmind error = EINVAL;
466 1.1 rmind goto error;
467 1.1 rmind }
468 1.1 rmind /*
469 1.1 rmind * Block until someone sends the message.
470 1.1 rmind * While doing this, notification should not be sent.
471 1.1 rmind */
472 1.1 rmind mq->mq_attrib.mq_flags |= MQ_RECEIVE;
473 1.1 rmind error = cv_timedwait_sig(&mq->mq_send_cv, &mq->mq_mtx, t);
474 1.1 rmind mq->mq_attrib.mq_flags &= ~MQ_RECEIVE;
475 1.1 rmind if (error || (mq->mq_attrib.mq_flags & MQ_UNLINK)) {
476 1.1 rmind if (error == EWOULDBLOCK)
477 1.1 rmind error = ETIMEDOUT;
478 1.1 rmind goto error;
479 1.1 rmind }
480 1.1 rmind KASSERT(!TAILQ_EMPTY(&mq->mq_head));
481 1.1 rmind }
482 1.1 rmind
483 1.1 rmind /* Remove the message from the queue */
484 1.1 rmind msg = TAILQ_FIRST(&mq->mq_head);
485 1.1 rmind KASSERT(msg != NULL);
486 1.1 rmind TAILQ_REMOVE(&mq->mq_head, msg, msg_queue);
487 1.1 rmind
488 1.1 rmind /* Decrement the counter and signal waiter, if any */
489 1.1 rmind mq->mq_attrib.mq_curmsgs--;
490 1.1 rmind cv_signal(&mq->mq_recv_cv);
491 1.1 rmind error:
492 1.1 rmind mutex_exit(&mq->mq_mtx);
493 1.1 rmind FILE_UNUSE(fp, l);
494 1.1 rmind if (error)
495 1.1 rmind return error;
496 1.1 rmind
497 1.1 rmind /*
498 1.1 rmind * Copy the data to the user-space.
499 1.1 rmind * Note: According to POSIX, no message should be removed from the
500 1.1 rmind * queue in case of fail - this would be violated.
501 1.1 rmind */
502 1.1 rmind *mlen = msg->msg_len;
503 1.1 rmind error = copyout(msg->msg_ptr, msg_ptr, msg->msg_len);
504 1.1 rmind if (error == 0 && msg_prio)
505 1.1 rmind error = copyout(&msg->msg_prio, msg_prio, sizeof(unsigned));
506 1.1 rmind mqueue_freemsg(msg, sizeof(struct mq_msg) + msg->msg_len);
507 1.1 rmind
508 1.1 rmind return error;
509 1.1 rmind }
510 1.1 rmind
511 1.1 rmind int
512 1.1 rmind sys_mq_receive(struct lwp *l, void *v, register_t *retval)
513 1.1 rmind {
514 1.1 rmind struct sys_mq_receive_args /* {
515 1.1 rmind syscallarg(mqd_t) mqdes;
516 1.1 rmind syscallarg(char *) msg_ptr;
517 1.1 rmind syscallarg(size_t) msg_len;
518 1.1 rmind syscallarg(unsigned *) msg_prio;
519 1.1 rmind } */ *uap = v;
520 1.1 rmind int error;
521 1.1 rmind ssize_t mlen;
522 1.1 rmind
523 1.1 rmind error = mq_receive1(l, SCARG(uap, mqdes), SCARG(uap, msg_ptr),
524 1.1 rmind SCARG(uap, msg_len), SCARG(uap, msg_prio), 0, &mlen);
525 1.1 rmind if (error == 0)
526 1.1 rmind *retval = mlen;
527 1.1 rmind
528 1.1 rmind return error;
529 1.1 rmind }
530 1.1 rmind
531 1.1 rmind int
532 1.1 rmind sys_mq_timedreceive(struct lwp *l, void *v, register_t *retval)
533 1.1 rmind {
534 1.1 rmind struct sys_mq_timedreceive_args /* {
535 1.1 rmind syscallarg(mqd_t) mqdes;
536 1.1 rmind syscallarg(char *) msg_ptr;
537 1.1 rmind syscallarg(size_t) msg_len;
538 1.1 rmind syscallarg(unsigned *) msg_prio;
539 1.1 rmind syscallarg(const struct timespec *) abs_timeout;
540 1.1 rmind } */ *uap = v;
541 1.1 rmind int error, t;
542 1.1 rmind ssize_t mlen;
543 1.1 rmind
544 1.1 rmind /* Get and convert time value */
545 1.1 rmind if (SCARG(uap, abs_timeout)) {
546 1.1 rmind error = abstimeout2timo(SCARG(uap, abs_timeout), &t);
547 1.1 rmind if (error)
548 1.1 rmind return error;
549 1.1 rmind } else
550 1.1 rmind t = 0;
551 1.1 rmind
552 1.1 rmind error = mq_receive1(l, SCARG(uap, mqdes), SCARG(uap, msg_ptr),
553 1.1 rmind SCARG(uap, msg_len), SCARG(uap, msg_prio), t, &mlen);
554 1.1 rmind if (error == 0)
555 1.1 rmind *retval = mlen;
556 1.1 rmind
557 1.1 rmind return error;
558 1.1 rmind }
559 1.1 rmind
560 1.1 rmind /*
561 1.1 rmind * Primary mq_send1() function.
562 1.1 rmind */
563 1.1 rmind static int
564 1.1 rmind mq_send1(struct lwp *l, mqd_t mqdes, const char *msg_ptr, size_t msg_len,
565 1.1 rmind unsigned msg_prio, int t)
566 1.1 rmind {
567 1.1 rmind struct file *fp = NULL;
568 1.1 rmind struct mqueue *mq;
569 1.1 rmind struct mq_msg *msg, *pos_msg;
570 1.1 rmind struct proc *notify = NULL;
571 1.1 rmind ksiginfo_t ksi;
572 1.1 rmind size_t size;
573 1.1 rmind int error;
574 1.1 rmind
575 1.1 rmind /* Check the priority range */
576 1.1 rmind if (msg_prio >= mq_prio_max)
577 1.1 rmind return EINVAL;
578 1.1 rmind
579 1.1 rmind /* Allocate a new message */
580 1.1 rmind size = sizeof(struct mq_msg) + msg_len;
581 1.1 rmind if (size > mq_max_msgsize)
582 1.1 rmind return EMSGSIZE;
583 1.1 rmind
584 1.1 rmind if (size > MQ_DEF_MSGSIZE)
585 1.1 rmind msg = kmem_alloc(size, KM_SLEEP);
586 1.1 rmind else
587 1.1 rmind msg = pool_get(&mqmsg_poll, PR_WAITOK);
588 1.1 rmind
589 1.1 rmind /* Get the data from user-space */
590 1.1 rmind error = copyin(msg_ptr, msg->msg_ptr, msg_len);
591 1.1 rmind if (error) {
592 1.1 rmind mqueue_freemsg(msg, size);
593 1.1 rmind return error;
594 1.1 rmind }
595 1.1 rmind msg->msg_len = msg_len;
596 1.1 rmind msg->msg_prio = msg_prio;
597 1.1 rmind
598 1.1 rmind /* Get the mqueue */
599 1.1 rmind error = mqueue_get(l, mqdes, VWRITE, &fp);
600 1.1 rmind if (error) {
601 1.1 rmind mqueue_freemsg(msg, size);
602 1.1 rmind return error;
603 1.1 rmind }
604 1.1 rmind mq = fp->f_data;
605 1.1 rmind
606 1.1 rmind /* Check the message size limit */
607 1.1 rmind if (msg_len <= 0 || msg_len > mq->mq_attrib.mq_msgsize) {
608 1.1 rmind error = EMSGSIZE;
609 1.1 rmind goto error;
610 1.1 rmind }
611 1.1 rmind
612 1.1 rmind /* Check if queue is full */
613 1.1 rmind if (mq->mq_attrib.mq_curmsgs == mq->mq_attrib.mq_maxmsg) {
614 1.1 rmind if (mq->mq_attrib.mq_flags & O_NONBLOCK) {
615 1.1 rmind error = EAGAIN;
616 1.1 rmind goto error;
617 1.1 rmind }
618 1.1 rmind if (t < 0) {
619 1.1 rmind error = EINVAL;
620 1.1 rmind goto error;
621 1.1 rmind }
622 1.1 rmind /* Block until queue becomes available */
623 1.1 rmind mq->mq_attrib.mq_flags |= MQ_SEND;
624 1.1 rmind error = cv_timedwait_sig(&mq->mq_recv_cv, &mq->mq_mtx, t);
625 1.1 rmind mq->mq_attrib.mq_flags &= ~MQ_SEND;
626 1.1 rmind if (error || (mq->mq_attrib.mq_flags & MQ_UNLINK)) {
627 1.1 rmind error = (error == EWOULDBLOCK) ? ETIMEDOUT : error;
628 1.1 rmind goto error;
629 1.1 rmind }
630 1.1 rmind }
631 1.1 rmind KASSERT(mq->mq_attrib.mq_curmsgs < mq->mq_attrib.mq_maxmsg);
632 1.1 rmind
633 1.1 rmind /* Insert message into the queue, according to the priority */
634 1.1 rmind TAILQ_FOREACH(pos_msg, &mq->mq_head, msg_queue)
635 1.1 rmind if (msg->msg_prio > pos_msg->msg_prio)
636 1.1 rmind break;
637 1.1 rmind if (pos_msg == NULL)
638 1.1 rmind TAILQ_INSERT_TAIL(&mq->mq_head, msg, msg_queue);
639 1.1 rmind else
640 1.1 rmind TAILQ_INSERT_BEFORE(pos_msg, msg, msg_queue);
641 1.1 rmind
642 1.1 rmind /* Check for the notify */
643 1.1 rmind if (mq->mq_attrib.mq_curmsgs == 0 && mq->mq_notify_proc &&
644 1.1 rmind (mq->mq_attrib.mq_flags & MQ_RECEIVE) == 0) {
645 1.1 rmind /* Initialize the signal */
646 1.1 rmind KSI_INIT(&ksi);
647 1.1 rmind ksi.ksi_signo = mq->mq_sig_notify.sigev_signo;
648 1.1 rmind ksi.ksi_code = SI_MESGQ;
649 1.1 rmind ksi.ksi_value = mq->mq_sig_notify.sigev_value;
650 1.1 rmind /* Unregister the process */
651 1.1 rmind notify = mq->mq_notify_proc;
652 1.1 rmind mq->mq_notify_proc = NULL;
653 1.1 rmind }
654 1.1 rmind
655 1.1 rmind /* Increment the counter and signal waiter, if any */
656 1.1 rmind mq->mq_attrib.mq_curmsgs++;
657 1.1 rmind cv_signal(&mq->mq_send_cv);
658 1.1 rmind error:
659 1.1 rmind mutex_exit(&mq->mq_mtx);
660 1.1 rmind FILE_UNUSE(fp, l);
661 1.1 rmind
662 1.1 rmind if (error) {
663 1.1 rmind mqueue_freemsg(msg, size);
664 1.1 rmind } else if (notify) {
665 1.1 rmind /* Send the notify, if needed */
666 1.1 rmind mutex_enter(&proclist_mutex);
667 1.1 rmind kpsignal(notify, &ksi, NULL);
668 1.1 rmind mutex_exit(&proclist_mutex);
669 1.1 rmind }
670 1.1 rmind
671 1.1 rmind return error;
672 1.1 rmind }
673 1.1 rmind
674 1.1 rmind int
675 1.1 rmind sys_mq_send(struct lwp *l, void *v, register_t *retval)
676 1.1 rmind {
677 1.1 rmind struct sys_mq_send_args /* {
678 1.1 rmind syscallarg(mqd_t) mqdes;
679 1.1 rmind syscallarg(const char *) msg_ptr;
680 1.1 rmind syscallarg(size_t) msg_len;
681 1.1 rmind syscallarg(unsigned) msg_prio;
682 1.1 rmind } */ *uap = v;
683 1.1 rmind
684 1.1 rmind return mq_send1(l, SCARG(uap, mqdes), SCARG(uap, msg_ptr),
685 1.1 rmind SCARG(uap, msg_len), SCARG(uap, msg_prio), 0);
686 1.1 rmind }
687 1.1 rmind
688 1.1 rmind int
689 1.1 rmind sys_mq_timedsend(struct lwp *l, void *v, register_t *retval)
690 1.1 rmind {
691 1.1 rmind struct sys_mq_timedsend_args /* {
692 1.1 rmind syscallarg(mqd_t) mqdes;
693 1.1 rmind syscallarg(const char *) msg_ptr;
694 1.1 rmind syscallarg(size_t) msg_len;
695 1.1 rmind syscallarg(unsigned) msg_prio;
696 1.1 rmind syscallarg(const struct timespec *) abs_timeout;
697 1.1 rmind } */ *uap = v;
698 1.1 rmind int t;
699 1.1 rmind
700 1.1 rmind /* Get and convert time value */
701 1.1 rmind if (SCARG(uap, abs_timeout)) {
702 1.1 rmind int error = abstimeout2timo(SCARG(uap, abs_timeout), &t);
703 1.1 rmind if (error)
704 1.1 rmind return error;
705 1.1 rmind } else
706 1.1 rmind t = 0;
707 1.1 rmind
708 1.1 rmind return mq_send1(l, SCARG(uap, mqdes), SCARG(uap, msg_ptr),
709 1.1 rmind SCARG(uap, msg_len), SCARG(uap, msg_prio), t);
710 1.1 rmind }
711 1.1 rmind
712 1.1 rmind int
713 1.1 rmind sys_mq_notify(struct lwp *l, void *v, register_t *retval)
714 1.1 rmind {
715 1.1 rmind struct sys_mq_notify_args /* {
716 1.1 rmind syscallarg(mqd_t) mqdes;
717 1.1 rmind syscallarg(const struct sigevent *) notification;
718 1.1 rmind } */ *uap = v;
719 1.1 rmind struct file *fp = NULL;
720 1.1 rmind struct mqueue *mq;
721 1.1 rmind struct sigevent sig;
722 1.1 rmind int error;
723 1.1 rmind
724 1.1 rmind if (SCARG(uap, notification)) {
725 1.1 rmind /* Get the signal from user-space */
726 1.1 rmind error = copyin(SCARG(uap, notification), &sig,
727 1.1 rmind sizeof(struct sigevent));
728 1.1 rmind if (error)
729 1.1 rmind return error;
730 1.1 rmind }
731 1.1 rmind
732 1.1 rmind error = mqueue_get(l, SCARG(uap, mqdes), VNOVAL, &fp);
733 1.1 rmind if (error)
734 1.1 rmind return error;
735 1.1 rmind mq = fp->f_data;
736 1.1 rmind
737 1.1 rmind if (SCARG(uap, notification)) {
738 1.1 rmind /* Register notification: set the signal and target process */
739 1.1 rmind if (mq->mq_notify_proc == NULL) {
740 1.1 rmind memcpy(&mq->mq_sig_notify, &sig,
741 1.1 rmind sizeof(struct sigevent));
742 1.1 rmind mq->mq_notify_proc = l->l_proc;
743 1.1 rmind } else {
744 1.1 rmind /* Fail if someone else already registered */
745 1.1 rmind error = EBUSY;
746 1.1 rmind }
747 1.1 rmind } else {
748 1.1 rmind /* Unregister the notification */
749 1.1 rmind mq->mq_notify_proc = NULL;
750 1.1 rmind }
751 1.1 rmind mutex_exit(&mq->mq_mtx);
752 1.1 rmind FILE_UNUSE(fp, l);
753 1.1 rmind
754 1.1 rmind return error;
755 1.1 rmind }
756 1.1 rmind
757 1.1 rmind int
758 1.1 rmind sys_mq_getattr(struct lwp *l, void *v, register_t *retval)
759 1.1 rmind {
760 1.1 rmind struct sys_mq_getattr_args /* {
761 1.1 rmind syscallarg(mqd_t) mqdes;
762 1.1 rmind syscallarg(struct mq_attr *) mqstat;
763 1.1 rmind } */ *uap = v;
764 1.1 rmind struct file *fp = NULL;
765 1.1 rmind struct mqueue *mq;
766 1.1 rmind struct mq_attr attr;
767 1.1 rmind int error;
768 1.1 rmind
769 1.1 rmind /* Get the message queue */
770 1.1 rmind error = mqueue_get(l, SCARG(uap, mqdes), VNOVAL, &fp);
771 1.1 rmind if (error)
772 1.1 rmind return error;
773 1.1 rmind mq = fp->f_data;
774 1.1 rmind memcpy(&attr, &mq->mq_attrib, sizeof(struct mq_attr));
775 1.1 rmind mutex_exit(&mq->mq_mtx);
776 1.1 rmind FILE_UNUSE(fp, l);
777 1.1 rmind
778 1.1 rmind return copyout(&attr, SCARG(uap, mqstat), sizeof(struct mq_attr));
779 1.1 rmind }
780 1.1 rmind
781 1.1 rmind int
782 1.1 rmind sys_mq_setattr(struct lwp *l, void *v, register_t *retval)
783 1.1 rmind {
784 1.1 rmind struct sys_mq_setattr_args /* {
785 1.1 rmind syscallarg(mqd_t) mqdes;
786 1.1 rmind syscallarg(const struct mq_attr *) mqstat;
787 1.1 rmind syscallarg(struct mq_attr *) omqstat;
788 1.1 rmind } */ *uap = v;
789 1.1 rmind struct file *fp = NULL;
790 1.1 rmind struct mqueue *mq;
791 1.1 rmind struct mq_attr attr;
792 1.1 rmind int error, nonblock;
793 1.1 rmind
794 1.1 rmind error = copyin(SCARG(uap, mqstat), &attr, sizeof(struct mq_attr));
795 1.1 rmind if (error)
796 1.1 rmind return error;
797 1.1 rmind nonblock = (attr.mq_flags & O_NONBLOCK);
798 1.1 rmind
799 1.1 rmind /* Get the message queue */
800 1.1 rmind error = mqueue_get(l, SCARG(uap, mqdes), VNOVAL, &fp);
801 1.1 rmind if (error)
802 1.1 rmind return error;
803 1.1 rmind mq = fp->f_data;
804 1.1 rmind
805 1.1 rmind /* Copy the old attributes, if needed */
806 1.1 rmind if (SCARG(uap, omqstat))
807 1.1 rmind memcpy(&attr, &mq->mq_attrib, sizeof(struct mq_attr));
808 1.1 rmind
809 1.1 rmind /* Ignore everything, except O_NONBLOCK */
810 1.1 rmind if (nonblock)
811 1.1 rmind mq->mq_attrib.mq_flags |= O_NONBLOCK;
812 1.1 rmind else
813 1.1 rmind mq->mq_attrib.mq_flags &= ~O_NONBLOCK;
814 1.1 rmind
815 1.1 rmind mutex_exit(&mq->mq_mtx);
816 1.1 rmind FILE_UNUSE(fp, l);
817 1.1 rmind
818 1.1 rmind /*
819 1.1 rmind * Copy the data to the user-space.
820 1.1 rmind * Note: According to POSIX, the new attributes should not be set in
821 1.1 rmind * case of fail - this would be violated.
822 1.1 rmind */
823 1.1 rmind if (SCARG(uap, omqstat))
824 1.1 rmind error = copyout(&attr, SCARG(uap, omqstat),
825 1.1 rmind sizeof(struct mq_attr));
826 1.1 rmind
827 1.1 rmind return error;
828 1.1 rmind }
829 1.1 rmind
830 1.1 rmind int
831 1.1 rmind sys_mq_unlink(struct lwp *l, void *v, register_t *retval)
832 1.1 rmind {
833 1.1 rmind struct sys_mq_unlink_args /* {
834 1.1 rmind syscallarg(const char *) name;
835 1.1 rmind } */ *uap = v;
836 1.1 rmind struct mqueue *mq;
837 1.1 rmind char *name;
838 1.1 rmind int error, refcnt = 0;
839 1.1 rmind
840 1.1 rmind /* Get the name from the user-space */
841 1.1 rmind name = kmem_zalloc(MQ_NAMELEN, KM_SLEEP);
842 1.1 rmind error = copyinstr(SCARG(uap, name), name, MQ_NAMELEN - 1, NULL);
843 1.1 rmind if (error) {
844 1.1 rmind kmem_free(name, MQ_NAMELEN);
845 1.1 rmind return error;
846 1.1 rmind }
847 1.1 rmind
848 1.1 rmind /* Lookup for this file */
849 1.1 rmind mutex_enter(&mqlist_mtx);
850 1.1 rmind mq = mqueue_lookup(name);
851 1.1 rmind if (mq == NULL) {
852 1.1 rmind error = ENOENT;
853 1.1 rmind goto error;
854 1.1 rmind }
855 1.1 rmind
856 1.1 rmind /* Check the permissions */
857 1.1 rmind if (mqueue_access(l, mq, VWRITE)) {
858 1.1 rmind mutex_exit(&mq->mq_mtx);
859 1.1 rmind error = EACCES;
860 1.1 rmind goto error;
861 1.1 rmind }
862 1.1 rmind
863 1.1 rmind /* Mark message queue as unlinking, before leaving the window */
864 1.1 rmind mq->mq_attrib.mq_flags |= MQ_UNLINK;
865 1.1 rmind
866 1.1 rmind /* Wake up all waiters, if there are such */
867 1.1 rmind cv_broadcast(&mq->mq_send_cv);
868 1.1 rmind cv_broadcast(&mq->mq_recv_cv);
869 1.1 rmind
870 1.1 rmind refcnt = mq->mq_refcnt;
871 1.1 rmind if (refcnt == 0)
872 1.1 rmind LIST_REMOVE(mq, mq_list);
873 1.1 rmind
874 1.1 rmind mutex_exit(&mq->mq_mtx);
875 1.1 rmind error:
876 1.1 rmind mutex_exit(&mqlist_mtx);
877 1.1 rmind
878 1.1 rmind /*
879 1.1 rmind * If there are no references - destroy the message
880 1.1 rmind * queue, otherwise, the last mq_close() will do that.
881 1.1 rmind */
882 1.1 rmind if (error == 0 && refcnt == 0)
883 1.1 rmind mqueue_destroy(mq);
884 1.1 rmind
885 1.1 rmind kmem_free(name, MQ_NAMELEN);
886 1.1 rmind return error;
887 1.1 rmind }
888 1.1 rmind
889 1.1 rmind /*
890 1.1 rmind * SysCtl.
891 1.1 rmind */
892 1.1 rmind
893 1.1 rmind SYSCTL_SETUP(sysctl_mqueue_setup, "sysctl mqueue setup")
894 1.1 rmind {
895 1.1 rmind const struct sysctlnode *node = NULL;
896 1.1 rmind
897 1.1 rmind sysctl_createv(clog, 0, NULL, NULL,
898 1.1 rmind CTLFLAG_PERMANENT,
899 1.1 rmind CTLTYPE_NODE, "kern", NULL,
900 1.1 rmind NULL, 0, NULL, 0,
901 1.1 rmind CTL_KERN, CTL_EOL);
902 1.1 rmind sysctl_createv(clog, 0, NULL, NULL,
903 1.1 rmind CTLFLAG_PERMANENT|CTLFLAG_IMMEDIATE,
904 1.1 rmind CTLTYPE_INT, "posix_msg",
905 1.1 rmind SYSCTL_DESCR("Version of IEEE Std 1003.1 and its "
906 1.1 rmind "Message Passing option to which the "
907 1.1 rmind "system attempts to conform"),
908 1.1 rmind NULL, _POSIX_MESSAGE_PASSING, NULL, 0,
909 1.1 rmind CTL_KERN, CTL_CREATE, CTL_EOL);
910 1.1 rmind sysctl_createv(clog, 0, NULL, &node,
911 1.1 rmind CTLFLAG_PERMANENT,
912 1.1 rmind CTLTYPE_NODE, "mqueue",
913 1.1 rmind SYSCTL_DESCR("Message queue options"),
914 1.1 rmind NULL, 0, NULL, 0,
915 1.1 rmind CTL_KERN, CTL_CREATE, CTL_EOL);
916 1.1 rmind
917 1.1 rmind if (node == NULL)
918 1.1 rmind return;
919 1.1 rmind
920 1.1 rmind sysctl_createv(clog, 0, &node, NULL,
921 1.1 rmind CTLFLAG_PERMANENT | CTLFLAG_READWRITE,
922 1.1 rmind CTLTYPE_INT, "mq_open_max",
923 1.1 rmind SYSCTL_DESCR("Maximal number of message queue descriptors "
924 1.1 rmind "that process could open"),
925 1.1 rmind NULL, 0, &mq_open_max, 0,
926 1.1 rmind CTL_CREATE, CTL_EOL);
927 1.1 rmind sysctl_createv(clog, 0, &node, NULL,
928 1.1 rmind CTLFLAG_PERMANENT | CTLFLAG_READWRITE,
929 1.1 rmind CTLTYPE_INT, "mq_prio_max",
930 1.1 rmind SYSCTL_DESCR("Maximal priority of the message"),
931 1.1 rmind NULL, 0, &mq_prio_max, 0,
932 1.1 rmind CTL_CREATE, CTL_EOL);
933 1.1 rmind sysctl_createv(clog, 0, &node, NULL,
934 1.1 rmind CTLFLAG_PERMANENT | CTLFLAG_READWRITE,
935 1.1 rmind CTLTYPE_INT, "mq_max_msgsize",
936 1.1 rmind SYSCTL_DESCR("Maximal allowed size of the message"),
937 1.1 rmind NULL, 0, &mq_max_msgsize, 0,
938 1.1 rmind CTL_CREATE, CTL_EOL);
939 1.1 rmind sysctl_createv(clog, 0, &node, NULL,
940 1.1 rmind CTLFLAG_PERMANENT | CTLFLAG_READWRITE,
941 1.1 rmind CTLTYPE_INT, "mq_def_maxmsg",
942 1.1 rmind SYSCTL_DESCR("Default maximal message count"),
943 1.1 rmind NULL, 0, &mq_def_maxmsg, 0,
944 1.1 rmind CTL_CREATE, CTL_EOL);
945 1.1 rmind }
946 1.1 rmind
947 1.1 rmind /*
948 1.1 rmind * Debugging.
949 1.1 rmind */
950 1.1 rmind #if defined(DDB)
951 1.1 rmind
952 1.1 rmind void
953 1.1 rmind mqueue_print_list(void (*pr)(const char *, ...))
954 1.1 rmind {
955 1.1 rmind struct mqueue *mq;
956 1.1 rmind
957 1.1 rmind (*pr)("Global list of the message queues:\n");
958 1.1 rmind (*pr)("%20s %10s %8s %8s %3s %4s %4s %4s\n",
959 1.1 rmind "Name", "Ptr", "Mode", "Flags", "Ref",
960 1.1 rmind "MaxMsg", "MsgSze", "CurMsg");
961 1.1 rmind LIST_FOREACH(mq, &mqueue_head, mq_list) {
962 1.1 rmind (*pr)("%20s %10p %8x %8x %3u %6lu %6lu %6lu\n",
963 1.1 rmind mq->mq_name, mq, mq->mq_mode,
964 1.1 rmind mq->mq_attrib.mq_flags, mq->mq_refcnt,
965 1.1 rmind mq->mq_attrib.mq_maxmsg, mq->mq_attrib.mq_msgsize,
966 1.1 rmind mq->mq_attrib.mq_curmsgs);
967 1.1 rmind }
968 1.1 rmind }
969 1.1 rmind
970 1.1 rmind #endif /* defined(DDB) */
971