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Commit | Line | Data |
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7b487ba9 CV |
1 | /* posix_ipc.cc: POSIX IPC API for Cygwin. |
2 | ||
7b487ba9 CV |
3 | This file is part of Cygwin. |
4 | ||
5 | This software is a copyrighted work licensed under the terms of the | |
6 | Cygwin license. Please consult the file "CYGWIN_LICENSE" for | |
7 | details. */ | |
8 | ||
7b487ba9 | 9 | #include "winsup.h" |
3748b3e8 | 10 | #include "shared_info.h" |
8fbd574e | 11 | #include "thread.h" |
7b487ba9 | 12 | #include "path.h" |
7b487ba9 | 13 | #include "cygtls.h" |
e6fbf13e CV |
14 | #include "fhandler.h" |
15 | #include "dtable.h" | |
16 | #include "cygheap.h" | |
7b487ba9 | 17 | #include "sigproc.h" |
abbde487 | 18 | #include "ntdll.h" |
b62450cf | 19 | #include "tls_pbuf.h" |
4fc922b2 | 20 | #include <io.h> |
7b487ba9 CV |
21 | #include <sys/mman.h> |
22 | #include <sys/param.h> | |
7b487ba9 | 23 | #include <stdlib.h> |
7b487ba9 | 24 | #include <unistd.h> |
7b487ba9 | 25 | #include <mqueue.h> |
8fbd574e | 26 | #include <semaphore.h> |
7b487ba9 | 27 | |
5f621bd3 | 28 | /* The prefix_len is the length of the path prefix including trailing "/" |
547ad329 | 29 | (or "/sem." for semaphores) as well as the trailing NUL. */ |
cb7e1879 | 30 | static struct |
7b487ba9 CV |
31 | { |
32 | const char *prefix; | |
547ad329 | 33 | const size_t prefix_len; |
7b487ba9 CV |
34 | const char *description; |
35 | } ipc_names[] = { | |
547ad329 CV |
36 | { "/dev/shm", 10, "POSIX shared memory object" }, |
37 | { "/dev/mqueue", 13, "POSIX message queue" }, | |
38 | { "/dev/shm", 14, "POSIX semaphore" } | |
7b487ba9 CV |
39 | }; |
40 | ||
41 | enum ipc_type_t | |
42 | { | |
43 | shmem, | |
44 | mqueue, | |
8fbd574e | 45 | semaphore |
7b487ba9 CV |
46 | }; |
47 | ||
48 | static bool | |
547ad329 | 49 | check_path (char *res_name, ipc_type_t type, const char *name, size_t len) |
7b487ba9 | 50 | { |
b32c31d1 | 51 | /* Note that we require the existance of the appropriate /dev subdirectories |
7b487ba9 CV |
52 | for POSIX IPC object support, similar to Linux (which supports the |
53 | directories, but doesn't require to mount them). We don't create | |
54 | these directory here, that's the task of the installer. But we check | |
55 | for existance and give ample warning. */ | |
56 | path_conv path (ipc_names[type].prefix, PC_SYM_NOFOLLOW); | |
57 | if (path.error || !path.exists () || !path.isdir ()) | |
58 | { | |
59 | small_printf ( | |
60 | "Warning: '%s' does not exists or is not a directory.\n\n" | |
61 | "%ss require the existance of this directory.\n" | |
62 | "Create the directory '%s' and set the permissions to 01777.\n" | |
63 | "For instance on the command line: mkdir -m 01777 %s\n", | |
64 | ipc_names[type].prefix, ipc_names[type].description, | |
65 | ipc_names[type].prefix, ipc_names[type].prefix); | |
66 | set_errno (EINVAL); | |
67 | return false; | |
68 | } | |
5b380b1c | 69 | /* Apart from handling backslash like slash, the naming rules are identical |
b32c31d1 CV |
70 | to Linux, including the names and requirements for subdirectories, if |
71 | the name contains further slashes. */ | |
5b380b1c CV |
72 | /* Name must not be empty and has to start with a slash (or backslash) */ |
73 | if (!name || !strchr ("/\\", name[0])) | |
7b487ba9 CV |
74 | { |
75 | debug_printf ("Invalid %s name '%s'", ipc_names[type].description, name); | |
76 | set_errno (EINVAL); | |
77 | return false; | |
78 | } | |
5b380b1c CV |
79 | /* Name must not consist of just a single slash (or backslash) */ |
80 | if (!name[1]) | |
81 | { | |
82 | debug_printf ("Invalid %s name '%s'", ipc_names[type].description, name); | |
83 | set_errno (ENOENT); | |
84 | return false; | |
85 | } | |
86 | /* Name must not contain slashes after the leading one */ | |
87 | if (strpbrk (name + 1, "/\\")) | |
88 | { | |
89 | debug_printf ("Invalid %s name '%s'", ipc_names[type].description, name); | |
90 | set_errno (EACCES); | |
91 | return false; | |
92 | } | |
93 | /* Length must be less than or equal to NAME_MAX, or NAME_MAX - 4 in | |
94 | case of semaphores, due to the leading "sem." prefix */ | |
95 | if (len > NAME_MAX - (type == semaphore ? strlen ("sem.") : 0)) | |
7b487ba9 CV |
96 | { |
97 | debug_printf ("%s name '%s' too long", ipc_names[type].description, name); | |
98 | set_errno (ENAMETOOLONG); | |
99 | return false; | |
100 | } | |
8fbd574e CV |
101 | __small_sprintf (res_name, "%s/%s%s", ipc_names[type].prefix, |
102 | type == semaphore ? "sem." : "", | |
5b380b1c | 103 | name + 1); |
7b487ba9 CV |
104 | return true; |
105 | } | |
106 | ||
8fbd574e CV |
107 | class ipc_flock |
108 | { | |
61522196 | 109 | struct flock fl; |
8fbd574e CV |
110 | |
111 | public: | |
112 | ipc_flock () { memset (&fl, 0, sizeof fl); } | |
113 | ||
114 | int lock (int fd, size_t size) | |
115 | { | |
116 | fl.l_type = F_WRLCK; | |
117 | fl.l_whence = SEEK_SET; | |
118 | fl.l_start = 0; | |
119 | fl.l_len = size; | |
2d9b4876 | 120 | return fcntl (fd, F_SETLKW, &fl); |
8fbd574e CV |
121 | } |
122 | int unlock (int fd) | |
123 | { | |
124 | if (!fl.l_len) | |
125 | return 0; | |
126 | fl.l_type = F_UNLCK; | |
2d9b4876 | 127 | return fcntl (fd, F_SETLKW, &fl); |
8fbd574e CV |
128 | } |
129 | }; | |
130 | ||
7b487ba9 CV |
131 | /* POSIX shared memory object implementation. */ |
132 | ||
133 | extern "C" int | |
134 | shm_open (const char *name, int oflag, mode_t mode) | |
135 | { | |
547ad329 CV |
136 | size_t len = strlen (name); |
137 | char shmname[ipc_names[shmem].prefix_len + len]; | |
7b487ba9 | 138 | |
547ad329 | 139 | if (!check_path (shmname, shmem, name, len)) |
7b487ba9 CV |
140 | return -1; |
141 | ||
142 | /* Check for valid flags. */ | |
143 | if (((oflag & O_ACCMODE) != O_RDONLY && (oflag & O_ACCMODE) != O_RDWR) | |
144 | || (oflag & ~(O_ACCMODE | O_CREAT | O_EXCL | O_TRUNC))) | |
145 | { | |
146 | debug_printf ("Invalid oflag 0%o", oflag); | |
147 | set_errno (EINVAL); | |
148 | return -1; | |
149 | } | |
150 | ||
e70fdfb9 | 151 | return open (shmname, oflag | O_CLOEXEC, mode & 0777); |
7b487ba9 CV |
152 | } |
153 | ||
154 | extern "C" int | |
155 | shm_unlink (const char *name) | |
156 | { | |
547ad329 CV |
157 | size_t len = strlen (name); |
158 | char shmname[ipc_names[shmem].prefix_len + len]; | |
7b487ba9 | 159 | |
547ad329 | 160 | if (!check_path (shmname, shmem, name, len)) |
7b487ba9 CV |
161 | return -1; |
162 | ||
163 | return unlink (shmname); | |
164 | } | |
165 | ||
166 | /* The POSIX message queue implementation is based on W. Richard STEVENS | |
167 | implementation, just tweaked for Cygwin. The main change is | |
168 | the usage of Windows mutexes and events instead of using the pthread | |
169 | synchronization objects. The pathname is massaged so that the | |
170 | files are created under /dev/mqueue. mq_timedsend and mq_timedreceive | |
171 | are implemented additionally. */ | |
172 | ||
7b487ba9 CV |
173 | extern "C" mqd_t |
174 | mq_open (const char *name, int oflag, ...) | |
175 | { | |
7b487ba9 | 176 | va_list ap; |
b62450cf | 177 | mode_t mode = 0; |
723f38b1 | 178 | fhandler_mqueue *fh = NULL; |
b62450cf | 179 | struct mq_attr *attr = NULL; |
7b487ba9 | 180 | |
547ad329 CV |
181 | size_t len = strlen (name); |
182 | char mqname[ipc_names[mqueue].prefix_len + len]; | |
183 | ||
184 | if (!check_path (mqname, mqueue, name, len)) | |
7b487ba9 CV |
185 | return (mqd_t) -1; |
186 | ||
3f3bd101 CV |
187 | __try |
188 | { | |
3f3bd101 CV |
189 | if (oflag & O_CREAT) |
190 | { | |
191 | va_start (ap, oflag); /* init ap to final named argument */ | |
192 | mode = va_arg (ap, mode_t) & ~S_IXUSR; | |
193 | attr = va_arg (ap, struct mq_attr *); | |
194 | va_end (ap); | |
7b487ba9 | 195 | } |
7b487ba9 | 196 | |
4fc922b2 | 197 | /* Create file descriptor for mqueue */ |
b62450cf | 198 | cygheap_fdnew fd; |
4fc922b2 | 199 | |
b62450cf | 200 | if (fd < 0) |
4fc922b2 | 201 | __leave; |
b62450cf CV |
202 | fh = (fhandler_mqueue *) build_fh_name (mqname, |
203 | PC_OPEN | PC_POSIX | |
204 | | PC_SYM_NOFOLLOW | PC_NULLEMPTY, | |
205 | NULL); | |
4fc922b2 CV |
206 | if (!fh) |
207 | __leave; | |
4fc922b2 | 208 | |
b62450cf CV |
209 | if (fh->mq_open (oflag, mode, attr)) |
210 | { | |
211 | fd = fh; | |
212 | return (mqd_t) fd; | |
213 | } | |
7b487ba9 | 214 | } |
3f3bd101 CV |
215 | __except (EFAULT) {} |
216 | __endtry | |
bce3563e | 217 | if (fh) |
b62450cf | 218 | delete fh; |
7b487ba9 CV |
219 | return (mqd_t) -1; |
220 | } | |
221 | ||
222 | extern "C" int | |
223 | mq_getattr (mqd_t mqd, struct mq_attr *mqstat) | |
224 | { | |
46f3b0ce | 225 | int ret = -1; |
7b487ba9 | 226 | |
46f3b0ce CV |
227 | cygheap_fdget fd ((int) mqd, true); |
228 | fhandler_mqueue *fh = fd->is_mqueue (); | |
229 | if (!fh) | |
230 | set_errno (EBADF); | |
231 | else | |
232 | ret = fh->mq_getattr (mqstat); | |
233 | return ret; | |
7b44665a | 234 | } |
7b487ba9 CV |
235 | |
236 | extern "C" int | |
237 | mq_setattr (mqd_t mqd, const struct mq_attr *mqstat, struct mq_attr *omqstat) | |
238 | { | |
46f3b0ce | 239 | int ret = -1; |
7b487ba9 | 240 | |
46f3b0ce CV |
241 | cygheap_fdget fd ((int) mqd, true); |
242 | fhandler_mqueue *fh = fd->is_mqueue (); | |
243 | if (!fh) | |
244 | set_errno (EBADF); | |
245 | else | |
246 | ret = fh->mq_setattr (mqstat, omqstat); | |
247 | return ret; | |
7b487ba9 CV |
248 | } |
249 | ||
250 | extern "C" int | |
251 | mq_notify (mqd_t mqd, const struct sigevent *notification) | |
252 | { | |
46f3b0ce | 253 | int ret = -1; |
7b44665a | 254 | |
46f3b0ce CV |
255 | cygheap_fdget fd ((int) mqd, true); |
256 | fhandler_mqueue *fh = fd->is_mqueue (); | |
257 | if (!fh) | |
258 | set_errno (EBADF); | |
259 | else | |
260 | ret = fh->mq_notify (notification); | |
261 | return ret; | |
7b44665a | 262 | } |
7b487ba9 | 263 | |
46f3b0ce CV |
264 | extern "C" int |
265 | mq_timedsend (mqd_t mqd, const char *ptr, size_t len, unsigned int prio, | |
266 | const struct timespec *abstime) | |
7b487ba9 | 267 | { |
3f3bd101 | 268 | int ret = -1; |
7b487ba9 | 269 | |
46f3b0ce CV |
270 | cygheap_fdget fd ((int) mqd, true); |
271 | fhandler_mqueue *fh = fd->is_mqueue (); | |
272 | if (!fh) | |
273 | set_errno (EBADF); | |
274 | else | |
275 | ret = fh->mq_timedsend (ptr, len, prio, abstime); | |
3f3bd101 | 276 | return ret; |
7b487ba9 CV |
277 | } |
278 | ||
279 | extern "C" int | |
280 | mq_send (mqd_t mqd, const char *ptr, size_t len, unsigned int prio) | |
281 | { | |
46f3b0ce | 282 | return mq_timedsend (mqd, ptr, len, prio, NULL); |
7b487ba9 CV |
283 | } |
284 | ||
46f3b0ce CV |
285 | extern "C" ssize_t |
286 | mq_timedreceive (mqd_t mqd, char *ptr, size_t maxlen, unsigned int *priop, | |
7b487ba9 CV |
287 | const struct timespec *abstime) |
288 | { | |
46f3b0ce | 289 | int ret = -1; |
7b487ba9 | 290 | |
46f3b0ce CV |
291 | cygheap_fdget fd ((int) mqd, true); |
292 | fhandler_mqueue *fh = fd->is_mqueue (); | |
293 | if (!fh) | |
294 | set_errno (EBADF); | |
295 | else | |
296 | ret = fh->mq_timedrecv (ptr, maxlen, priop, abstime); | |
297 | return ret; | |
7b487ba9 CV |
298 | } |
299 | ||
300 | extern "C" ssize_t | |
301 | mq_receive (mqd_t mqd, char *ptr, size_t maxlen, unsigned int *priop) | |
302 | { | |
46f3b0ce | 303 | return mq_timedreceive (mqd, ptr, maxlen, priop, NULL); |
7b487ba9 CV |
304 | } |
305 | ||
306 | extern "C" int | |
307 | mq_close (mqd_t mqd) | |
308 | { | |
3f3bd101 | 309 | __try |
7b487ba9 | 310 | { |
4fc922b2 | 311 | cygheap_fdget fd ((int) mqd, true); |
2cc914a3 | 312 | if (!fd->is_mqueue ()) |
3f3bd101 CV |
313 | { |
314 | set_errno (EBADF); | |
315 | __leave; | |
316 | } | |
7b487ba9 | 317 | |
3f3bd101 CV |
318 | if (mq_notify (mqd, NULL)) /* unregister calling process */ |
319 | __leave; | |
7b487ba9 | 320 | |
4fc922b2 CV |
321 | fd->isclosed (true); |
322 | fd->close (); | |
323 | fd.release (); | |
3f3bd101 CV |
324 | return 0; |
325 | } | |
326 | __except (EBADF) {} | |
327 | __endtry | |
328 | return -1; | |
7b487ba9 CV |
329 | } |
330 | ||
331 | extern "C" int | |
332 | mq_unlink (const char *name) | |
333 | { | |
547ad329 CV |
334 | size_t len = strlen (name); |
335 | char mqname[ipc_names[mqueue].prefix_len + len]; | |
7b487ba9 | 336 | |
547ad329 | 337 | if (!check_path (mqname, mqueue, name, len)) |
7b487ba9 CV |
338 | return -1; |
339 | if (unlink (mqname) == -1) | |
340 | return -1; | |
341 | return 0; | |
342 | } | |
343 | ||
8fbd574e CV |
344 | /* POSIX named semaphore implementation. Loosely based on Richard W. STEPHENS |
345 | implementation as far as sem_open is concerned, but under the hood using | |
346 | the already existing semaphore class in thread.cc. Using a file backed | |
347 | solution allows to implement kernel persistent named semaphores. */ | |
348 | ||
b62450cf CV |
349 | #define MAX_TRIES 10 /* for waiting for initialization */ |
350 | ||
8fbd574e CV |
351 | struct sem_finfo |
352 | { | |
353 | unsigned int value; | |
354 | unsigned long long hash; | |
355 | LUID luid; | |
356 | }; | |
357 | ||
358 | extern "C" sem_t * | |
359 | sem_open (const char *name, int oflag, ...) | |
360 | { | |
3f3bd101 | 361 | int i, fd = -1, created = 0; |
8fbd574e CV |
362 | va_list ap; |
363 | mode_t mode = 0; | |
364 | unsigned int value = 0; | |
61522196 | 365 | struct stat statbuff; |
8fbd574e CV |
366 | sem_t *sem = SEM_FAILED; |
367 | sem_finfo sf; | |
8fbd574e CV |
368 | bool wasopen = false; |
369 | ipc_flock file; | |
370 | ||
547ad329 CV |
371 | size_t len = strlen (name); |
372 | char semname[ipc_names[semaphore].prefix_len + len]; | |
373 | ||
374 | if (!check_path (semname, semaphore, name, len)) | |
8fbd574e CV |
375 | return SEM_FAILED; |
376 | ||
3f3bd101 | 377 | __try |
8fbd574e | 378 | { |
3f3bd101 CV |
379 | oflag &= (O_CREAT | O_EXCL); |
380 | ||
381 | again: | |
382 | if (oflag & O_CREAT) | |
7b44665a | 383 | { |
3f3bd101 CV |
384 | va_start (ap, oflag); /* init ap to final named argument */ |
385 | mode = va_arg (ap, mode_t) & ~S_IXUSR; | |
386 | value = va_arg (ap, unsigned int); | |
387 | va_end (ap); | |
388 | ||
389 | /* Open and specify O_EXCL and user-execute */ | |
390 | fd = open (semname, oflag | O_EXCL | O_RDWR | O_CLOEXEC, | |
391 | mode | S_IXUSR); | |
392 | if (fd < 0) | |
393 | { | |
394 | if (errno == EEXIST && (oflag & O_EXCL) == 0) | |
395 | goto exists; /* already exists, OK */ | |
396 | return SEM_FAILED; | |
397 | } | |
398 | created = 1; | |
399 | /* First one to create the file initializes it. */ | |
400 | NtAllocateLocallyUniqueId (&sf.luid); | |
401 | sf.value = value; | |
402 | sf.hash = hash_path_name (0, semname); | |
403 | if (write (fd, &sf, sizeof sf) != sizeof sf) | |
404 | __leave; | |
405 | sem = semaphore::open (sf.hash, sf.luid, fd, oflag, mode, value, | |
406 | wasopen); | |
407 | if (sem == SEM_FAILED) | |
408 | __leave; | |
409 | /* Initialization complete, turn off user-execute bit */ | |
410 | if (fchmod (fd, mode) == -1) | |
411 | __leave; | |
412 | /* Don't close (fd); */ | |
413 | return sem; | |
8fbd574e | 414 | } |
8fbd574e | 415 | |
3f3bd101 CV |
416 | exists: |
417 | /* Open the file and fetch the semaphore name. */ | |
418 | if ((fd = open (semname, O_RDWR | O_CLOEXEC)) < 0) | |
8fbd574e CV |
419 | { |
420 | if (errno == ENOENT && (oflag & O_CREAT)) | |
3f3bd101 CV |
421 | goto again; |
422 | __leave; | |
423 | } | |
424 | /* Make certain initialization is complete */ | |
425 | for (i = 0; i < MAX_TRIES; i++) | |
426 | { | |
2d9b4876 | 427 | if (stat (semname, &statbuff) == -1) |
8fbd574e | 428 | { |
3f3bd101 CV |
429 | if (errno == ENOENT && (oflag & O_CREAT)) |
430 | { | |
431 | close (fd); | |
432 | fd = -1; | |
433 | goto again; | |
434 | } | |
435 | __leave; | |
8fbd574e | 436 | } |
3f3bd101 CV |
437 | if ((statbuff.st_mode & S_IXUSR) == 0) |
438 | break; | |
439 | sleep (1); | |
8fbd574e | 440 | } |
3f3bd101 CV |
441 | if (i == MAX_TRIES) |
442 | { | |
443 | set_errno (ETIMEDOUT); | |
444 | __leave; | |
445 | } | |
446 | if (file.lock (fd, sizeof sf)) | |
447 | __leave; | |
448 | if (read (fd, &sf, sizeof sf) != sizeof sf) | |
449 | __leave; | |
450 | sem = semaphore::open (sf.hash, sf.luid, fd, oflag, mode, sf.value, | |
451 | wasopen); | |
452 | file.unlock (fd); | |
453 | if (sem == SEM_FAILED) | |
454 | __leave; | |
455 | /* If wasopen is set, the semaphore was already opened and we already have | |
456 | an open file descriptor pointing to the file. This means, we have to | |
457 | close the file descriptor created in this call. It won't be stored | |
458 | anywhere anyway. */ | |
459 | if (wasopen) | |
460 | close (fd); | |
461 | return sem; | |
8fbd574e | 462 | } |
3f3bd101 CV |
463 | __except (EFAULT) {} |
464 | __endtry | |
8fbd574e CV |
465 | /* Don't let following function calls change errno */ |
466 | save_errno save; | |
467 | ||
3f3bd101 CV |
468 | if (fd >= 0) |
469 | file.unlock (fd); | |
8fbd574e CV |
470 | if (created) |
471 | unlink (semname); | |
472 | if (sem != SEM_FAILED) | |
473 | semaphore::close (sem); | |
599d462d CV |
474 | if (fd >= 0) |
475 | close (fd); | |
8fbd574e CV |
476 | return SEM_FAILED; |
477 | } | |
478 | ||
2d9b4876 | 479 | extern "C" off_t lseek (int, off_t, int); |
b62450cf | 480 | |
8fbd574e CV |
481 | int |
482 | _sem_close (sem_t *sem, bool do_close) | |
483 | { | |
484 | sem_finfo sf; | |
485 | int fd, ret = -1; | |
486 | ipc_flock file; | |
487 | ||
488 | if (semaphore::getinternal (sem, &fd, &sf.hash, &sf.luid, &sf.value) == -1) | |
489 | return -1; | |
490 | if (!file.lock (fd, sizeof sf) | |
2d9b4876 | 491 | && lseek (fd, 0LL, SEEK_SET) != (off_t) -1 |
8fbd574e CV |
492 | && write (fd, &sf, sizeof sf) == sizeof sf) |
493 | ret = do_close ? semaphore::close (sem) : 0; | |
494 | ||
495 | /* Don't let following function calls change errno */ | |
496 | save_errno save; | |
497 | file.unlock (fd); | |
498 | close (fd); | |
499 | ||
500 | return ret; | |
501 | } | |
502 | ||
503 | extern "C" int | |
504 | sem_close (sem_t *sem) | |
505 | { | |
506 | return _sem_close (sem, true); | |
507 | } | |
508 | ||
509 | extern "C" int | |
510 | sem_unlink (const char *name) | |
511 | { | |
547ad329 CV |
512 | size_t len = strlen (name); |
513 | char semname[ipc_names[semaphore].prefix_len + len]; | |
8fbd574e | 514 | |
547ad329 | 515 | if (!check_path (semname, semaphore, name, len)) |
8fbd574e CV |
516 | return -1; |
517 | if (unlink (semname) == -1) | |
518 | return -1; | |
519 | return 0; | |
520 | } | |
bf1d972d CV |
521 | |
522 | extern "C" int | |
523 | sem_init (sem_t * sem, int pshared, unsigned int value) | |
524 | { | |
525 | return semaphore::init (sem, pshared, value); | |
526 | } | |
527 | ||
528 | extern "C" int | |
529 | sem_destroy (sem_t * sem) | |
530 | { | |
531 | return semaphore::destroy (sem); | |
532 | } | |
533 | ||
534 | extern "C" int | |
535 | sem_wait (sem_t * sem) | |
536 | { | |
537 | return semaphore::wait (sem); | |
538 | } | |
539 | ||
540 | extern "C" int | |
541 | sem_trywait (sem_t * sem) | |
542 | { | |
543 | return semaphore::trywait (sem); | |
544 | } | |
545 | ||
546 | extern "C" int | |
547 | sem_clockwait (sem_t * sem, clockid_t clock_id, const struct timespec *abstime) | |
548 | { | |
549 | return semaphore::clockwait (sem, clock_id, abstime); | |
550 | } | |
551 | ||
552 | extern "C" int | |
553 | sem_timedwait (sem_t * sem, const struct timespec *abstime) | |
554 | { | |
555 | return semaphore::clockwait (sem, CLOCK_REALTIME, abstime); | |
556 | } | |
557 | ||
558 | extern "C" int | |
559 | sem_post (sem_t *sem) | |
560 | { | |
561 | return semaphore::post (sem); | |
562 | } | |
563 | ||
564 | extern "C" int | |
565 | sem_getvalue (sem_t * sem, int *sval) | |
566 | { | |
567 | return semaphore::getvalue (sem, sval); | |
568 | } |