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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 269 __mq_unlink(const char *path) 270 { 271 272 return __sys_kmq_unlink(path); 273 } 274 275 #pragma weak mq_getfd_np 276 int 277 mq_getfd_np(mqd_t mqd) 278 { 279 280 return (mqd->oshandle); 281 } 282