1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2006 David Xu <davidxu@freebsd.org> 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 * $FreeBSD$ 29 */ 30 31 #include <sys/cdefs.h> 32 #include <sys/types.h> 33 #include <sys/syscall.h> 34 #include <sys/mqueue.h> 35 36 #include "namespace.h" 37 #include <errno.h> 38 #include <pthread.h> 39 #include <stddef.h> 40 #include <stdlib.h> 41 #include <signal.h> 42 #include "sigev_thread.h" 43 #include "un-namespace.h" 44 #include "libc_private.h" 45 46 extern int __sys_kmq_notify(int, const struct sigevent *); 47 extern int __sys_kmq_open(const char *, int, mode_t, 48 const struct mq_attr *); 49 extern int __sys_kmq_setattr(int, const struct mq_attr *__restrict, 50 struct mq_attr *__restrict); 51 extern ssize_t __sys_kmq_timedreceive(int, char *__restrict, size_t, 52 unsigned *__restrict, const struct timespec *__restrict); 53 extern int __sys_kmq_timedsend(int, const char *, size_t, unsigned, 54 const struct timespec *); 55 extern int __sys_kmq_unlink(const char *); 56 extern int __sys_close(int fd); 57 58 struct __mq { 59 int oshandle; 60 struct sigev_node *node; 61 }; 62 63 __weak_reference(__mq_open, mq_open); 64 __weak_reference(__mq_open, _mq_open); 65 __weak_reference(__mq_close, mq_close); 66 __weak_reference(__mq_close, _mq_close); 67 __weak_reference(__mq_notify, mq_notify); 68 __weak_reference(__mq_notify, _mq_notify); 69 __weak_reference(__mq_getattr, mq_getattr); 70 __weak_reference(__mq_getattr, _mq_getattr); 71 __weak_reference(__mq_setattr, mq_setattr); 72 __weak_reference(__mq_setattr, _mq_setattr); 73 __weak_reference(__mq_timedreceive_cancel, mq_timedreceive); 74 __weak_reference(__mq_timedreceive, _mq_timedreceive); 75 __weak_reference(__mq_timedsend_cancel, mq_timedsend); 76 __weak_reference(__mq_timedsend, _mq_timedsend); 77 __weak_reference(__mq_unlink, mq_unlink); 78 __weak_reference(__mq_unlink, _mq_unlink); 79 __weak_reference(__mq_send_cancel, mq_send); 80 __weak_reference(__mq_send, _mq_send); 81 __weak_reference(__mq_receive_cancel, mq_receive); 82 __weak_reference(__mq_receive, _mq_receive); 83 84 mqd_t 85 __mq_open(const char *name, int oflag, mode_t mode, 86 const struct mq_attr *attr) 87 { 88 struct __mq *mq; 89 int err; 90 91 mq = malloc(sizeof(struct __mq)); 92 if (mq == NULL) 93 return (NULL); 94 95 mq->oshandle = __sys_kmq_open(name, oflag, mode, attr); 96 if (mq->oshandle != -1) { 97 mq->node = NULL; 98 return (mq); 99 } 100 err = errno; 101 free(mq); 102 errno = err; 103 return ((mqd_t)-1L); 104 } 105 106 int 107 __mq_close(mqd_t mqd) 108 { 109 int h; 110 111 if (mqd->node != NULL) { 112 __sigev_list_lock(); 113 __sigev_delete_node(mqd->node); 114 __sigev_list_unlock(); 115 } 116 h = mqd->oshandle; 117 free(mqd); 118 return (__sys_close(h)); 119 } 120 121 typedef void (*mq_func)(union sigval val); 122 123 static void 124 mq_dispatch(struct sigev_node *sn) 125 { 126 mq_func f = sn->sn_func; 127 128 /* 129 * Check generation before calling user function, 130 * this should avoid expired notification. 131 */ 132 if (sn->sn_gen == sn->sn_info.si_value.sival_int) 133 f(sn->sn_value); 134 } 135 136 int 137 __mq_notify(mqd_t mqd, const struct sigevent *evp) 138 { 139 struct sigevent ev; 140 struct sigev_node *sn; 141 int ret; 142 143 if (evp == NULL || evp->sigev_notify != SIGEV_THREAD) { 144 if (mqd->node != NULL) { 145 __sigev_list_lock(); 146 __sigev_delete_node(mqd->node); 147 mqd->node = NULL; 148 __sigev_list_unlock(); 149 } 150 return __sys_kmq_notify(mqd->oshandle, evp); 151 } 152 153 if (__sigev_check_init()) { 154 /* 155 * Thread library is not enabled. 156 */ 157 errno = EINVAL; 158 return (-1); 159 } 160 161 sn = __sigev_alloc(SI_MESGQ, evp, mqd->node, 1); 162 if (sn == NULL) { 163 errno = EAGAIN; 164 return (-1); 165 } 166 167 sn->sn_id = mqd->oshandle; 168 sn->sn_dispatch = mq_dispatch; 169 __sigev_get_sigevent(sn, &ev, sn->sn_gen); 170 __sigev_list_lock(); 171 if (mqd->node != NULL) 172 __sigev_delete_node(mqd->node); 173 mqd->node = sn; 174 __sigev_register(sn); 175 ret = __sys_kmq_notify(mqd->oshandle, &ev); 176 __sigev_list_unlock(); 177 return (ret); 178 } 179 180 int 181 __mq_getattr(mqd_t mqd, struct mq_attr *attr) 182 { 183 184 return __sys_kmq_setattr(mqd->oshandle, NULL, attr); 185 } 186 187 int 188 __mq_setattr(mqd_t mqd, const struct mq_attr *newattr, struct mq_attr *oldattr) 189 { 190 191 return __sys_kmq_setattr(mqd->oshandle, newattr, oldattr); 192 } 193 194 ssize_t 195 __mq_timedreceive(mqd_t mqd, char *buf, size_t len, 196 unsigned *prio, const struct timespec *timeout) 197 { 198 199 return __sys_kmq_timedreceive(mqd->oshandle, buf, len, prio, timeout); 200 } 201 202 ssize_t 203 __mq_timedreceive_cancel(mqd_t mqd, char *buf, size_t len, 204 unsigned *prio, const struct timespec *timeout) 205 { 206 int ret; 207 208 _pthread_cancel_enter(1); 209 ret = __sys_kmq_timedreceive(mqd->oshandle, buf, len, prio, timeout); 210 _pthread_cancel_leave(ret == -1); 211 return (ret); 212 } 213 214 ssize_t 215 __mq_receive(mqd_t mqd, char *buf, size_t len, unsigned *prio) 216 { 217 218 return __sys_kmq_timedreceive(mqd->oshandle, buf, len, prio, NULL); 219 } 220 221 ssize_t 222 __mq_receive_cancel(mqd_t mqd, char *buf, size_t len, unsigned *prio) 223 { 224 int ret; 225 226 _pthread_cancel_enter(1); 227 ret = __sys_kmq_timedreceive(mqd->oshandle, buf, len, prio, NULL); 228 _pthread_cancel_leave(ret == -1); 229 return (ret); 230 } 231 ssize_t 232 __mq_timedsend(mqd_t mqd, char *buf, size_t len, 233 unsigned prio, const struct timespec *timeout) 234 { 235 236 return __sys_kmq_timedsend(mqd->oshandle, buf, len, prio, timeout); 237 } 238 239 ssize_t 240 __mq_timedsend_cancel(mqd_t mqd, char *buf, size_t len, 241 unsigned prio, const struct timespec *timeout) 242 { 243 int ret; 244 245 _pthread_cancel_enter(1); 246 ret = __sys_kmq_timedsend(mqd->oshandle, buf, len, prio, timeout); 247 _pthread_cancel_leave(ret == -1); 248 return (ret); 249 } 250 251 ssize_t 252 __mq_send(mqd_t mqd, char *buf, size_t len, unsigned prio) 253 { 254 255 return __sys_kmq_timedsend(mqd->oshandle, buf, len, prio, NULL); 256 } 257 258 259 ssize_t 260 __mq_send_cancel(mqd_t mqd, char *buf, size_t len, unsigned prio) 261 { 262 int ret; 263 264 _pthread_cancel_enter(1); 265 ret = __sys_kmq_timedsend(mqd->oshandle, buf, len, prio, NULL); 266 _pthread_cancel_leave(ret == -1); 267 return (ret); 268 } 269 270 int 271 __mq_unlink(const char *path) 272 { 273 274 return __sys_kmq_unlink(path); 275 } 276 277 #pragma weak mq_getfd_np 278 int 279 mq_getfd_np(mqd_t mqd) 280 { 281 282 return (mqd->oshandle); 283 } 284