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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" |
7b487ba9 CV |
19 | #include <sys/mman.h> |
20 | #include <sys/param.h> | |
7b487ba9 | 21 | #include <stdlib.h> |
7b487ba9 | 22 | #include <unistd.h> |
7b487ba9 | 23 | #include <mqueue.h> |
8fbd574e | 24 | #include <semaphore.h> |
7b487ba9 | 25 | |
547ad329 CV |
26 | /* The prefix_len is the length of the path prefix ncluding trailing "/" |
27 | (or "/sem." for semaphores) as well as the trailing NUL. */ | |
cb7e1879 | 28 | static struct |
7b487ba9 CV |
29 | { |
30 | const char *prefix; | |
547ad329 | 31 | const size_t prefix_len; |
7b487ba9 CV |
32 | const char *description; |
33 | } ipc_names[] = { | |
547ad329 CV |
34 | { "/dev/shm", 10, "POSIX shared memory object" }, |
35 | { "/dev/mqueue", 13, "POSIX message queue" }, | |
36 | { "/dev/shm", 14, "POSIX semaphore" } | |
7b487ba9 CV |
37 | }; |
38 | ||
39 | enum ipc_type_t | |
40 | { | |
41 | shmem, | |
42 | mqueue, | |
8fbd574e | 43 | semaphore |
7b487ba9 CV |
44 | }; |
45 | ||
46 | static bool | |
547ad329 | 47 | check_path (char *res_name, ipc_type_t type, const char *name, size_t len) |
7b487ba9 | 48 | { |
b32c31d1 | 49 | /* Note that we require the existance of the appropriate /dev subdirectories |
7b487ba9 CV |
50 | for POSIX IPC object support, similar to Linux (which supports the |
51 | directories, but doesn't require to mount them). We don't create | |
52 | these directory here, that's the task of the installer. But we check | |
53 | for existance and give ample warning. */ | |
54 | path_conv path (ipc_names[type].prefix, PC_SYM_NOFOLLOW); | |
55 | if (path.error || !path.exists () || !path.isdir ()) | |
56 | { | |
57 | small_printf ( | |
58 | "Warning: '%s' does not exists or is not a directory.\n\n" | |
59 | "%ss require the existance of this directory.\n" | |
60 | "Create the directory '%s' and set the permissions to 01777.\n" | |
61 | "For instance on the command line: mkdir -m 01777 %s\n", | |
62 | ipc_names[type].prefix, ipc_names[type].description, | |
63 | ipc_names[type].prefix, ipc_names[type].prefix); | |
64 | set_errno (EINVAL); | |
65 | return false; | |
66 | } | |
b32c31d1 CV |
67 | /* Name must not be empty, or just be a single slash, or start with more |
68 | than one slash. Same for backslash. | |
69 | Apart from handling backslash like slash, the naming rules are identical | |
70 | to Linux, including the names and requirements for subdirectories, if | |
71 | the name contains further slashes. */ | |
72 | if (!name || (strchr ("/\\", name[0]) | |
73 | && (!name[1] || strchr ("/\\", name[1])))) | |
7b487ba9 CV |
74 | { |
75 | debug_printf ("Invalid %s name '%s'", ipc_names[type].description, name); | |
76 | set_errno (EINVAL); | |
77 | return false; | |
78 | } | |
b32c31d1 CV |
79 | /* Skip leading (back-)slash. */ |
80 | if (strchr ("/\\", name[0])) | |
81 | ++name; | |
547ad329 | 82 | if (len > PATH_MAX - ipc_names[type].prefix_len) |
7b487ba9 CV |
83 | { |
84 | debug_printf ("%s name '%s' too long", ipc_names[type].description, name); | |
85 | set_errno (ENAMETOOLONG); | |
86 | return false; | |
87 | } | |
8fbd574e CV |
88 | __small_sprintf (res_name, "%s/%s%s", ipc_names[type].prefix, |
89 | type == semaphore ? "sem." : "", | |
b32c31d1 | 90 | name); |
7b487ba9 CV |
91 | return true; |
92 | } | |
93 | ||
94 | static int | |
95 | ipc_mutex_init (HANDLE *pmtx, const char *name) | |
96 | { | |
3748b3e8 CV |
97 | WCHAR buf[MAX_PATH]; |
98 | UNICODE_STRING uname; | |
99 | OBJECT_ATTRIBUTES attr; | |
100 | NTSTATUS status; | |
101 | ||
102 | __small_swprintf (buf, L"mqueue/mtx_%s", name); | |
103 | RtlInitUnicodeString (&uname, buf); | |
104 | InitializeObjectAttributes (&attr, &uname, | |
105 | OBJ_INHERIT | OBJ_OPENIF | OBJ_CASE_INSENSITIVE, | |
106 | get_shared_parent_dir (), | |
107 | everyone_sd (CYG_MUTANT_ACCESS)); | |
108 | status = NtCreateMutant (pmtx, CYG_MUTANT_ACCESS, &attr, FALSE); | |
109 | if (!NT_SUCCESS (status)) | |
110 | { | |
61522196 | 111 | debug_printf ("NtCreateMutant: %y", status); |
3748b3e8 CV |
112 | return geterrno_from_win_error (RtlNtStatusToDosError (status)); |
113 | } | |
114 | return 0; | |
7b487ba9 CV |
115 | } |
116 | ||
117 | static int | |
c6d1382a | 118 | ipc_mutex_lock (HANDLE mtx, bool eintr) |
7b487ba9 | 119 | { |
c6d1382a CV |
120 | switch (cygwait (mtx, cw_infinite, cw_cancel | cw_cancel_self |
121 | | (eintr ? cw_sig_eintr : cw_sig_restart))) | |
7b44665a | 122 | { |
7b487ba9 CV |
123 | case WAIT_OBJECT_0: |
124 | case WAIT_ABANDONED_0: | |
125 | return 0; | |
962f9a2c | 126 | case WAIT_SIGNALED: |
7b487ba9 CV |
127 | set_errno (EINTR); |
128 | return 1; | |
129 | default: | |
130 | break; | |
7b44665a | 131 | } |
7b487ba9 CV |
132 | return geterrno_from_win_error (); |
133 | } | |
134 | ||
135 | static inline int | |
136 | ipc_mutex_unlock (HANDLE mtx) | |
137 | { | |
138 | return ReleaseMutex (mtx) ? 0 : geterrno_from_win_error (); | |
139 | } | |
140 | ||
141 | static inline int | |
142 | ipc_mutex_close (HANDLE mtx) | |
143 | { | |
144 | return CloseHandle (mtx) ? 0 : geterrno_from_win_error (); | |
145 | } | |
146 | ||
147 | static int | |
3748b3e8 | 148 | ipc_cond_init (HANDLE *pevt, const char *name, char sr) |
7b487ba9 | 149 | { |
3748b3e8 CV |
150 | WCHAR buf[MAX_PATH]; |
151 | UNICODE_STRING uname; | |
152 | OBJECT_ATTRIBUTES attr; | |
153 | NTSTATUS status; | |
154 | ||
155 | __small_swprintf (buf, L"mqueue/evt_%s%c", name, sr); | |
156 | RtlInitUnicodeString (&uname, buf); | |
157 | InitializeObjectAttributes (&attr, &uname, | |
158 | OBJ_INHERIT | OBJ_OPENIF | OBJ_CASE_INSENSITIVE, | |
159 | get_shared_parent_dir (), | |
160 | everyone_sd (CYG_EVENT_ACCESS)); | |
161 | status = NtCreateEvent (pevt, CYG_EVENT_ACCESS, &attr, | |
162 | NotificationEvent, FALSE); | |
163 | if (!NT_SUCCESS (status)) | |
164 | { | |
61522196 | 165 | debug_printf ("NtCreateEvent: %y", status); |
3748b3e8 CV |
166 | return geterrno_from_win_error (RtlNtStatusToDosError (status)); |
167 | } | |
168 | return 0; | |
7b487ba9 CV |
169 | } |
170 | ||
171 | static int | |
172 | ipc_cond_timedwait (HANDLE evt, HANDLE mtx, const struct timespec *abstime) | |
173 | { | |
962f9a2c | 174 | HANDLE w4[4] = { evt, }; |
86bf572e | 175 | DWORD cnt = 2; |
206a6ee9 | 176 | DWORD timer_idx = 0; |
86bf572e CV |
177 | int ret = 0; |
178 | ||
c43e9340 | 179 | wait_signal_arrived here (w4[1]); |
a91ac4dc CV |
180 | if ((w4[cnt] = pthread::get_cancel_event ()) != NULL) |
181 | ++cnt; | |
86bf572e CV |
182 | if (abstime) |
183 | { | |
397526de | 184 | if (!valid_timespec (*abstime)) |
86bf572e CV |
185 | return EINVAL; |
186 | ||
187 | /* If a timeout is set, we create a waitable timer to wait for. | |
188 | This is the easiest way to handle the absolute timeout value, given | |
189 | that NtSetTimer also takes absolute times and given the double | |
190 | dependency on evt *and* mtx, which requires to call WFMO twice. */ | |
191 | NTSTATUS status; | |
192 | LARGE_INTEGER duetime; | |
193 | ||
206a6ee9 CV |
194 | timer_idx = cnt++; |
195 | status = NtCreateTimer (&w4[timer_idx], TIMER_ALL_ACCESS, NULL, | |
86bf572e CV |
196 | NotificationTimer); |
197 | if (!NT_SUCCESS (status)) | |
198 | return geterrno_from_nt_status (status); | |
0ff057d5 | 199 | timespec_to_filetime (abstime, &duetime); |
206a6ee9 | 200 | status = NtSetTimer (w4[timer_idx], &duetime, NULL, NULL, FALSE, 0, NULL); |
86bf572e CV |
201 | if (!NT_SUCCESS (status)) |
202 | { | |
206a6ee9 | 203 | NtClose (w4[timer_idx]); |
86bf572e CV |
204 | return geterrno_from_nt_status (status); |
205 | } | |
7b487ba9 | 206 | } |
3748b3e8 | 207 | ResetEvent (evt); |
86bf572e CV |
208 | if ((ret = ipc_mutex_unlock (mtx)) != 0) |
209 | return ret; | |
210 | /* Everything's set up, so now wait for the event to be signalled. */ | |
211 | restart1: | |
212 | switch (WaitForMultipleObjects (cnt, w4, FALSE, INFINITE)) | |
7b44665a | 213 | { |
7b487ba9 | 214 | case WAIT_OBJECT_0: |
86bf572e CV |
215 | break; |
216 | case WAIT_OBJECT_0 + 1: | |
217 | if (_my_tls.call_signal_handler ()) | |
218 | goto restart1; | |
219 | ret = EINTR; | |
220 | break; | |
221 | case WAIT_OBJECT_0 + 2: | |
206a6ee9 | 222 | if (timer_idx != 2) |
b86f999a | 223 | pthread::static_cancel_self (); |
50ad1980 | 224 | fallthrough; |
206a6ee9 | 225 | case WAIT_OBJECT_0 + 3: |
86bf572e CV |
226 | ret = ETIMEDOUT; |
227 | break; | |
7b487ba9 | 228 | default: |
86bf572e | 229 | ret = geterrno_from_win_error (); |
7b487ba9 | 230 | break; |
7b44665a | 231 | } |
86bf572e CV |
232 | if (ret == 0) |
233 | { | |
234 | /* At this point we need to lock the mutex. The wait is practically | |
235 | the same as before, just that we now wait on the mutex instead of the | |
236 | event. */ | |
237 | restart2: | |
238 | w4[0] = mtx; | |
239 | switch (WaitForMultipleObjects (cnt, w4, FALSE, INFINITE)) | |
240 | { | |
241 | case WAIT_OBJECT_0: | |
242 | case WAIT_ABANDONED_0: | |
243 | break; | |
244 | case WAIT_OBJECT_0 + 1: | |
245 | if (_my_tls.call_signal_handler ()) | |
246 | goto restart2; | |
247 | ret = EINTR; | |
248 | break; | |
249 | case WAIT_OBJECT_0 + 2: | |
206a6ee9 CV |
250 | if (timer_idx != 2) |
251 | pthread_testcancel (); | |
50ad1980 | 252 | fallthrough; |
206a6ee9 | 253 | case WAIT_OBJECT_0 + 3: |
86bf572e CV |
254 | ret = ETIMEDOUT; |
255 | break; | |
256 | default: | |
257 | ret = geterrno_from_win_error (); | |
258 | break; | |
259 | } | |
260 | } | |
206a6ee9 | 261 | if (timer_idx) |
86bf572e CV |
262 | { |
263 | if (ret != ETIMEDOUT) | |
206a6ee9 CV |
264 | NtCancelTimer (w4[timer_idx], NULL); |
265 | NtClose (w4[timer_idx]); | |
86bf572e CV |
266 | } |
267 | return ret; | |
7b487ba9 CV |
268 | } |
269 | ||
86bf572e | 270 | static inline void |
7b487ba9 CV |
271 | ipc_cond_signal (HANDLE evt) |
272 | { | |
86bf572e | 273 | SetEvent (evt); |
7b487ba9 CV |
274 | } |
275 | ||
86bf572e | 276 | static inline void |
7b487ba9 CV |
277 | ipc_cond_close (HANDLE evt) |
278 | { | |
86bf572e | 279 | CloseHandle (evt); |
7b487ba9 CV |
280 | } |
281 | ||
8fbd574e CV |
282 | class ipc_flock |
283 | { | |
61522196 | 284 | struct flock fl; |
8fbd574e CV |
285 | |
286 | public: | |
287 | ipc_flock () { memset (&fl, 0, sizeof fl); } | |
288 | ||
289 | int lock (int fd, size_t size) | |
290 | { | |
291 | fl.l_type = F_WRLCK; | |
292 | fl.l_whence = SEEK_SET; | |
293 | fl.l_start = 0; | |
294 | fl.l_len = size; | |
fabfb1a1 | 295 | return fcntl64 (fd, F_SETLKW, &fl); |
8fbd574e CV |
296 | } |
297 | int unlock (int fd) | |
298 | { | |
299 | if (!fl.l_len) | |
300 | return 0; | |
301 | fl.l_type = F_UNLCK; | |
fabfb1a1 | 302 | return fcntl64 (fd, F_SETLKW, &fl); |
8fbd574e CV |
303 | } |
304 | }; | |
305 | ||
7b487ba9 CV |
306 | /* POSIX shared memory object implementation. */ |
307 | ||
308 | extern "C" int | |
309 | shm_open (const char *name, int oflag, mode_t mode) | |
310 | { | |
547ad329 CV |
311 | size_t len = strlen (name); |
312 | char shmname[ipc_names[shmem].prefix_len + len]; | |
7b487ba9 | 313 | |
547ad329 | 314 | if (!check_path (shmname, shmem, name, len)) |
7b487ba9 CV |
315 | return -1; |
316 | ||
317 | /* Check for valid flags. */ | |
318 | if (((oflag & O_ACCMODE) != O_RDONLY && (oflag & O_ACCMODE) != O_RDWR) | |
319 | || (oflag & ~(O_ACCMODE | O_CREAT | O_EXCL | O_TRUNC))) | |
320 | { | |
321 | debug_printf ("Invalid oflag 0%o", oflag); | |
322 | set_errno (EINVAL); | |
323 | return -1; | |
324 | } | |
325 | ||
e70fdfb9 | 326 | return open (shmname, oflag | O_CLOEXEC, mode & 0777); |
7b487ba9 CV |
327 | } |
328 | ||
329 | extern "C" int | |
330 | shm_unlink (const char *name) | |
331 | { | |
547ad329 CV |
332 | size_t len = strlen (name); |
333 | char shmname[ipc_names[shmem].prefix_len + len]; | |
7b487ba9 | 334 | |
547ad329 | 335 | if (!check_path (shmname, shmem, name, len)) |
7b487ba9 CV |
336 | return -1; |
337 | ||
338 | return unlink (shmname); | |
339 | } | |
340 | ||
341 | /* The POSIX message queue implementation is based on W. Richard STEVENS | |
342 | implementation, just tweaked for Cygwin. The main change is | |
343 | the usage of Windows mutexes and events instead of using the pthread | |
344 | synchronization objects. The pathname is massaged so that the | |
345 | files are created under /dev/mqueue. mq_timedsend and mq_timedreceive | |
346 | are implemented additionally. */ | |
347 | ||
61522196 CV |
348 | /* The mq_attr structure is defined using long datatypes per POSIX. |
349 | For interoperability reasons between 32 and 64 bit processes, we have | |
350 | to make sure to use a unified structure layout in the message queue file. | |
351 | That's what the mq_fattr is, the in-file representation of the mq_attr | |
352 | struct. */ | |
353 | #pragma pack (push, 4) | |
354 | struct mq_fattr | |
355 | { | |
356 | uint32_t mq_flags; | |
357 | uint32_t mq_maxmsg; | |
358 | uint32_t mq_msgsize; | |
359 | uint32_t mq_curmsgs; | |
360 | }; | |
361 | ||
7b487ba9 CV |
362 | struct mq_hdr |
363 | { | |
61522196 CV |
364 | struct mq_fattr mqh_attr; /* the queue's attributes */ |
365 | int32_t mqh_head; /* index of first message */ | |
366 | int32_t mqh_free; /* index of first free message */ | |
367 | int32_t mqh_nwait; /* #threads blocked in mq_receive() */ | |
93162be5 | 368 | pid_t mqh_pid; /* nonzero PID if mqh_event set */ |
8fbd574e | 369 | char mqh_uname[36]; /* unique name used to identify synchronization |
7b44665a | 370 | objects connected to this queue */ |
61522196 CV |
371 | union { |
372 | struct sigevent mqh_event; /* for mq_notify() */ | |
373 | /* Make sure sigevent takes the same space on 32 and 64 bit systems. | |
374 | Other than that, it doesn't need to be compatible since only | |
375 | one process can be notified at a time. */ | |
376 | uint64_t mqh_placeholder[8]; | |
377 | }; | |
378 | uint32_t mqh_magic; /* Expect MQI_MAGIC here, otherwise it's | |
379 | an old-style message queue. */ | |
7b487ba9 CV |
380 | }; |
381 | ||
382 | struct msg_hdr | |
383 | { | |
61522196 CV |
384 | int32_t msg_next; /* index of next on linked list */ |
385 | int32_t msg_len; /* actual length */ | |
93162be5 | 386 | unsigned int msg_prio; /* priority */ |
7b487ba9 | 387 | }; |
61522196 | 388 | #pragma pack (pop) |
7b487ba9 CV |
389 | |
390 | struct mq_info | |
391 | { | |
93162be5 | 392 | struct mq_hdr *mqi_hdr; /* start of mmap'ed region */ |
61522196 | 393 | uint32_t mqi_magic; /* magic number if open */ |
93162be5 CV |
394 | int mqi_flags; /* flags for this process */ |
395 | HANDLE mqi_lock; /* mutex lock */ | |
3748b3e8 CV |
396 | HANDLE mqi_waitsend; /* and condition variable for full queue */ |
397 | HANDLE mqi_waitrecv; /* and condition variable for empty queue */ | |
7b487ba9 CV |
398 | }; |
399 | ||
400 | #define MQI_MAGIC 0x98765432UL | |
401 | ||
402 | #define MSGSIZE(i) roundup((i), sizeof(long)) | |
403 | ||
404 | #define MAX_TRIES 10 /* for waiting for initialization */ | |
405 | ||
406 | struct mq_attr defattr = { 0, 10, 8192, 0 }; /* Linux defaults. */ | |
407 | ||
61522196 CV |
408 | extern "C" off_t lseek64 (int, off_t, int); |
409 | extern "C" void *mmap64 (void *, size_t, int, int, int, off_t); | |
7b487ba9 CV |
410 | |
411 | extern "C" mqd_t | |
412 | mq_open (const char *name, int oflag, ...) | |
413 | { | |
3f3bd101 | 414 | int i, fd = -1, nonblock, created = 0; |
7b487ba9 | 415 | long msgsize, index; |
61522196 | 416 | off_t filesize = 0; |
7b487ba9 CV |
417 | va_list ap; |
418 | mode_t mode; | |
3f3bd101 | 419 | int8_t *mptr = (int8_t *) MAP_FAILED; |
61522196 | 420 | struct stat statbuff; |
7b487ba9 CV |
421 | struct mq_hdr *mqhdr; |
422 | struct msg_hdr *msghdr; | |
423 | struct mq_attr *attr; | |
3f3bd101 | 424 | struct mq_info *mqinfo = NULL; |
8fbd574e | 425 | LUID luid; |
7b487ba9 | 426 | |
547ad329 CV |
427 | size_t len = strlen (name); |
428 | char mqname[ipc_names[mqueue].prefix_len + len]; | |
429 | ||
430 | if (!check_path (mqname, mqueue, name, len)) | |
7b487ba9 CV |
431 | return (mqd_t) -1; |
432 | ||
3f3bd101 CV |
433 | __try |
434 | { | |
435 | oflag &= (O_CREAT | O_EXCL | O_NONBLOCK); | |
436 | nonblock = oflag & O_NONBLOCK; | |
437 | oflag &= ~O_NONBLOCK; | |
7b487ba9 | 438 | |
3f3bd101 CV |
439 | again: |
440 | if (oflag & O_CREAT) | |
441 | { | |
442 | va_start (ap, oflag); /* init ap to final named argument */ | |
443 | mode = va_arg (ap, mode_t) & ~S_IXUSR; | |
444 | attr = va_arg (ap, struct mq_attr *); | |
445 | va_end (ap); | |
446 | ||
447 | /* Open and specify O_EXCL and user-execute */ | |
448 | fd = open (mqname, oflag | O_EXCL | O_RDWR | O_CLOEXEC, | |
449 | mode | S_IXUSR); | |
450 | if (fd < 0) | |
451 | { | |
452 | if (errno == EEXIST && (oflag & O_EXCL) == 0) | |
453 | goto exists; /* already exists, OK */ | |
454 | return (mqd_t) -1; | |
455 | } | |
456 | created = 1; | |
457 | /* First one to create the file initializes it */ | |
458 | if (attr == NULL) | |
459 | attr = &defattr; | |
460 | /* Check minimum and maximum values. The max values are pretty much | |
461 | arbitrary, taken from the linux mq_overview man page. However, | |
462 | these max values make sure that the internal mq_fattr structure | |
463 | can use 32 bit types. */ | |
464 | else if (attr->mq_maxmsg <= 0 || attr->mq_maxmsg > 32768 | |
465 | || attr->mq_msgsize <= 0 || attr->mq_msgsize > 1048576) | |
466 | { | |
467 | set_errno (EINVAL); | |
468 | __leave; | |
469 | } | |
470 | /* Calculate and set the file size */ | |
471 | msgsize = MSGSIZE (attr->mq_msgsize); | |
472 | filesize = sizeof (struct mq_hdr) | |
473 | + (attr->mq_maxmsg * (sizeof (struct msg_hdr) + msgsize)); | |
474 | if (lseek64 (fd, filesize - 1, SEEK_SET) == -1) | |
475 | __leave; | |
476 | if (write (fd, "", 1) == -1) | |
477 | __leave; | |
478 | ||
479 | /* Memory map the file */ | |
480 | mptr = (int8_t *) mmap64 (NULL, (size_t) filesize, | |
481 | PROT_READ | PROT_WRITE, | |
482 | MAP_SHARED, fd, 0); | |
483 | if (mptr == (int8_t *) MAP_FAILED) | |
484 | __leave; | |
485 | ||
486 | /* Allocate one mq_info{} for the queue */ | |
487 | if (!(mqinfo = (struct mq_info *) | |
488 | calloc (1, sizeof (struct mq_info)))) | |
489 | __leave; | |
490 | mqinfo->mqi_hdr = mqhdr = (struct mq_hdr *) mptr; | |
491 | mqinfo->mqi_magic = MQI_MAGIC; | |
492 | mqinfo->mqi_flags = nonblock; | |
493 | ||
494 | /* Initialize header at beginning of file */ | |
495 | /* Create free list with all messages on it */ | |
496 | mqhdr->mqh_attr.mq_flags = 0; | |
497 | mqhdr->mqh_attr.mq_maxmsg = attr->mq_maxmsg; | |
498 | mqhdr->mqh_attr.mq_msgsize = attr->mq_msgsize; | |
499 | mqhdr->mqh_attr.mq_curmsgs = 0; | |
500 | mqhdr->mqh_nwait = 0; | |
501 | mqhdr->mqh_pid = 0; | |
502 | NtAllocateLocallyUniqueId (&luid); | |
503 | __small_sprintf (mqhdr->mqh_uname, "%016X%08x%08x", | |
504 | hash_path_name (0,mqname), | |
505 | luid.HighPart, luid.LowPart); | |
506 | mqhdr->mqh_head = 0; | |
507 | mqhdr->mqh_magic = MQI_MAGIC; | |
508 | index = sizeof (struct mq_hdr); | |
509 | mqhdr->mqh_free = index; | |
510 | for (i = 0; i < attr->mq_maxmsg - 1; i++) | |
511 | { | |
512 | msghdr = (struct msg_hdr *) &mptr[index]; | |
513 | index += sizeof (struct msg_hdr) + msgsize; | |
514 | msghdr->msg_next = index; | |
515 | } | |
516 | msghdr = (struct msg_hdr *) &mptr[index]; | |
517 | msghdr->msg_next = 0; /* end of free list */ | |
7b487ba9 | 518 | |
3f3bd101 CV |
519 | /* Initialize mutex & condition variables */ |
520 | i = ipc_mutex_init (&mqinfo->mqi_lock, mqhdr->mqh_uname); | |
521 | if (i != 0) | |
522 | { | |
523 | set_errno (i); | |
524 | __leave; | |
525 | } | |
526 | i = ipc_cond_init (&mqinfo->mqi_waitsend, mqhdr->mqh_uname, 'S'); | |
527 | if (i != 0) | |
528 | { | |
529 | set_errno (i); | |
530 | __leave; | |
531 | } | |
532 | i = ipc_cond_init (&mqinfo->mqi_waitrecv, mqhdr->mqh_uname, 'R'); | |
533 | if (i != 0) | |
534 | { | |
535 | set_errno (i); | |
536 | __leave; | |
537 | } | |
538 | /* Initialization complete, turn off user-execute bit */ | |
539 | if (fchmod (fd, mode) == -1) | |
540 | __leave; | |
541 | close (fd); | |
542 | return ((mqd_t) mqinfo); | |
543 | } | |
544 | ||
545 | exists: | |
546 | /* Open the file then memory map */ | |
547 | if ((fd = open (mqname, O_RDWR | O_CLOEXEC)) < 0) | |
7b44665a | 548 | { |
3f3bd101 CV |
549 | if (errno == ENOENT && (oflag & O_CREAT)) |
550 | goto again; | |
551 | __leave; | |
7b487ba9 | 552 | } |
3f3bd101 CV |
553 | /* Make certain initialization is complete */ |
554 | for (i = 0; i < MAX_TRIES; i++) | |
7b487ba9 | 555 | { |
3f3bd101 CV |
556 | if (stat64 (mqname, &statbuff) == -1) |
557 | { | |
558 | if (errno == ENOENT && (oflag & O_CREAT)) | |
559 | { | |
560 | close (fd); | |
561 | fd = -1; | |
562 | goto again; | |
563 | } | |
564 | __leave; | |
565 | } | |
566 | if ((statbuff.st_mode & S_IXUSR) == 0) | |
567 | break; | |
568 | sleep (1); | |
569 | } | |
570 | if (i == MAX_TRIES) | |
571 | { | |
572 | set_errno (ETIMEDOUT); | |
573 | __leave; | |
7b487ba9 | 574 | } |
7b487ba9 | 575 | |
3f3bd101 | 576 | filesize = statbuff.st_size; |
7b487ba9 CV |
577 | mptr = (int8_t *) mmap64 (NULL, (size_t) filesize, PROT_READ | PROT_WRITE, |
578 | MAP_SHARED, fd, 0); | |
579 | if (mptr == (int8_t *) MAP_FAILED) | |
3f3bd101 CV |
580 | __leave; |
581 | close (fd); | |
582 | fd = -1; | |
7b487ba9 | 583 | |
3f3bd101 | 584 | /* Allocate one mq_info{} for each open */ |
3748b3e8 | 585 | if (!(mqinfo = (struct mq_info *) calloc (1, sizeof (struct mq_info)))) |
3f3bd101 | 586 | __leave; |
7b487ba9 | 587 | mqinfo->mqi_hdr = mqhdr = (struct mq_hdr *) mptr; |
3f3bd101 | 588 | if (mqhdr->mqh_magic != MQI_MAGIC) |
7b487ba9 | 589 | { |
3f3bd101 CV |
590 | system_printf ( |
591 | "Old message queue \"%s\" detected!\n" | |
592 | "This file is not usable as message queue anymore due to changes in the " | |
593 | "internal file layout. Please remove the file and try again.", mqname); | |
594 | set_errno (EACCES); | |
595 | __leave; | |
7b487ba9 | 596 | } |
3f3bd101 CV |
597 | mqinfo->mqi_magic = MQI_MAGIC; |
598 | mqinfo->mqi_flags = nonblock; | |
7b487ba9 | 599 | |
3f3bd101 | 600 | /* Initialize mutex & condition variable */ |
93162be5 | 601 | i = ipc_mutex_init (&mqinfo->mqi_lock, mqhdr->mqh_uname); |
7b487ba9 | 602 | if (i != 0) |
3f3bd101 CV |
603 | { |
604 | set_errno (i); | |
605 | __leave; | |
606 | } | |
3748b3e8 CV |
607 | i = ipc_cond_init (&mqinfo->mqi_waitsend, mqhdr->mqh_uname, 'S'); |
608 | if (i != 0) | |
3f3bd101 CV |
609 | { |
610 | set_errno (i); | |
611 | __leave; | |
612 | } | |
3748b3e8 | 613 | i = ipc_cond_init (&mqinfo->mqi_waitrecv, mqhdr->mqh_uname, 'R'); |
7b487ba9 | 614 | if (i != 0) |
7b487ba9 | 615 | { |
3f3bd101 CV |
616 | set_errno (i); |
617 | __leave; | |
7b487ba9 | 618 | } |
3f3bd101 | 619 | return (mqd_t) mqinfo; |
7b487ba9 | 620 | } |
3f3bd101 CV |
621 | __except (EFAULT) {} |
622 | __endtry | |
7b487ba9 CV |
623 | /* Don't let following function calls change errno */ |
624 | save_errno save; | |
7b487ba9 CV |
625 | if (created) |
626 | unlink (mqname); | |
627 | if (mptr != (int8_t *) MAP_FAILED) | |
628 | munmap((void *) mptr, (size_t) filesize); | |
629 | if (mqinfo) | |
3748b3e8 CV |
630 | { |
631 | if (mqinfo->mqi_lock) | |
b86f999a | 632 | ipc_mutex_close (mqinfo->mqi_lock); |
3748b3e8 CV |
633 | if (mqinfo->mqi_waitsend) |
634 | ipc_cond_close (mqinfo->mqi_waitsend); | |
635 | if (mqinfo->mqi_waitrecv) | |
636 | ipc_cond_close (mqinfo->mqi_waitrecv); | |
637 | free (mqinfo); | |
638 | } | |
599d462d CV |
639 | if (fd >= 0) |
640 | close (fd); | |
7b487ba9 CV |
641 | return (mqd_t) -1; |
642 | } | |
643 | ||
644 | extern "C" int | |
645 | mq_getattr (mqd_t mqd, struct mq_attr *mqstat) | |
646 | { | |
647 | int n; | |
648 | struct mq_hdr *mqhdr; | |
61522196 | 649 | struct mq_fattr *attr; |
7b487ba9 | 650 | struct mq_info *mqinfo; |
7b44665a | 651 | |
3f3bd101 | 652 | __try |
7b487ba9 | 653 | { |
3f3bd101 CV |
654 | mqinfo = (struct mq_info *) mqd; |
655 | if (mqinfo->mqi_magic != MQI_MAGIC) | |
656 | { | |
657 | set_errno (EBADF); | |
658 | __leave; | |
659 | } | |
660 | mqhdr = mqinfo->mqi_hdr; | |
661 | attr = &mqhdr->mqh_attr; | |
c6d1382a | 662 | if ((n = ipc_mutex_lock (mqinfo->mqi_lock, false)) != 0) |
3f3bd101 CV |
663 | { |
664 | errno = n; | |
665 | __leave; | |
666 | } | |
667 | mqstat->mq_flags = mqinfo->mqi_flags; /* per-open */ | |
668 | mqstat->mq_maxmsg = attr->mq_maxmsg; /* remaining three per-queue */ | |
669 | mqstat->mq_msgsize = attr->mq_msgsize; | |
670 | mqstat->mq_curmsgs = attr->mq_curmsgs; | |
7b487ba9 | 671 | |
3f3bd101 CV |
672 | ipc_mutex_unlock (mqinfo->mqi_lock); |
673 | return 0; | |
674 | } | |
675 | __except (EBADF) {} | |
676 | __endtry | |
677 | return -1; | |
7b44665a | 678 | } |
7b487ba9 CV |
679 | |
680 | extern "C" int | |
681 | mq_setattr (mqd_t mqd, const struct mq_attr *mqstat, struct mq_attr *omqstat) | |
682 | { | |
683 | int n; | |
7b44665a | 684 | struct mq_hdr *mqhdr; |
61522196 | 685 | struct mq_fattr *attr; |
7b487ba9 CV |
686 | struct mq_info *mqinfo; |
687 | ||
3f3bd101 | 688 | __try |
7b487ba9 | 689 | { |
3f3bd101 CV |
690 | mqinfo = (struct mq_info *) mqd; |
691 | if (mqinfo->mqi_magic != MQI_MAGIC) | |
692 | { | |
693 | set_errno (EBADF); | |
694 | __leave; | |
695 | } | |
696 | mqhdr = mqinfo->mqi_hdr; | |
697 | attr = &mqhdr->mqh_attr; | |
c6d1382a | 698 | if ((n = ipc_mutex_lock (mqinfo->mqi_lock, false)) != 0) |
3f3bd101 CV |
699 | { |
700 | errno = n; | |
701 | __leave; | |
702 | } | |
7b487ba9 | 703 | |
3f3bd101 CV |
704 | if (omqstat != NULL) |
705 | { | |
706 | omqstat->mq_flags = mqinfo->mqi_flags; /* previous attributes */ | |
707 | omqstat->mq_maxmsg = attr->mq_maxmsg; | |
708 | omqstat->mq_msgsize = attr->mq_msgsize; | |
709 | omqstat->mq_curmsgs = attr->mq_curmsgs; /* and current status */ | |
710 | } | |
7b487ba9 | 711 | |
3f3bd101 CV |
712 | if (mqstat->mq_flags & O_NONBLOCK) |
713 | mqinfo->mqi_flags |= O_NONBLOCK; | |
714 | else | |
715 | mqinfo->mqi_flags &= ~O_NONBLOCK; | |
7b487ba9 | 716 | |
3f3bd101 CV |
717 | ipc_mutex_unlock (mqinfo->mqi_lock); |
718 | return 0; | |
719 | } | |
720 | __except (EBADF) {} | |
721 | __endtry | |
722 | return -1; | |
7b487ba9 CV |
723 | } |
724 | ||
725 | extern "C" int | |
726 | mq_notify (mqd_t mqd, const struct sigevent *notification) | |
727 | { | |
728 | int n; | |
729 | pid_t pid; | |
730 | struct mq_hdr *mqhdr; | |
731 | struct mq_info *mqinfo; | |
7b44665a | 732 | |
3f3bd101 | 733 | __try |
7b487ba9 | 734 | { |
3f3bd101 CV |
735 | mqinfo = (struct mq_info *) mqd; |
736 | if (mqinfo->mqi_magic != MQI_MAGIC) | |
737 | { | |
738 | set_errno (EBADF); | |
739 | __leave; | |
740 | } | |
741 | mqhdr = mqinfo->mqi_hdr; | |
c6d1382a | 742 | if ((n = ipc_mutex_lock (mqinfo->mqi_lock, false)) != 0) |
3f3bd101 CV |
743 | { |
744 | errno = n; | |
745 | __leave; | |
746 | } | |
7b44665a | 747 | |
3f3bd101 CV |
748 | pid = getpid (); |
749 | if (!notification) | |
7b487ba9 | 750 | { |
3f3bd101 CV |
751 | if (mqhdr->mqh_pid == pid) |
752 | mqhdr->mqh_pid = 0; /* unregister calling process */ | |
753 | } | |
754 | else | |
755 | { | |
756 | if (mqhdr->mqh_pid != 0) | |
7b487ba9 | 757 | { |
3f3bd101 CV |
758 | if (kill (mqhdr->mqh_pid, 0) != -1 || errno != ESRCH) |
759 | { | |
760 | set_errno (EBUSY); | |
761 | ipc_mutex_unlock (mqinfo->mqi_lock); | |
762 | __leave; | |
763 | } | |
7b487ba9 | 764 | } |
3f3bd101 CV |
765 | mqhdr->mqh_pid = pid; |
766 | mqhdr->mqh_event = *notification; | |
7b487ba9 | 767 | } |
3f3bd101 CV |
768 | ipc_mutex_unlock (mqinfo->mqi_lock); |
769 | return 0; | |
7b44665a | 770 | } |
3f3bd101 CV |
771 | __except (EBADF) {} |
772 | __endtry | |
773 | return -1; | |
7b44665a | 774 | } |
7b487ba9 CV |
775 | |
776 | static int | |
777 | _mq_send (mqd_t mqd, const char *ptr, size_t len, unsigned int prio, | |
778 | const struct timespec *abstime) | |
779 | { | |
780 | int n; | |
781 | long index, freeindex; | |
782 | int8_t *mptr; | |
783 | struct sigevent *sigev; | |
784 | struct mq_hdr *mqhdr; | |
61522196 | 785 | struct mq_fattr *attr; |
7b487ba9 | 786 | struct msg_hdr *msghdr, *nmsghdr, *pmsghdr; |
3f3bd101 CV |
787 | struct mq_info *mqinfo = NULL; |
788 | bool ipc_mutex_locked = false; | |
789 | int ret = -1; | |
7b487ba9 | 790 | |
74f9ac5b CV |
791 | pthread_testcancel (); |
792 | ||
3f3bd101 | 793 | __try |
7b487ba9 | 794 | { |
3f3bd101 CV |
795 | mqinfo = (struct mq_info *) mqd; |
796 | if (mqinfo->mqi_magic != MQI_MAGIC) | |
797 | { | |
798 | set_errno (EBADF); | |
799 | __leave; | |
800 | } | |
801 | if (prio > MQ_PRIO_MAX) | |
802 | { | |
803 | set_errno (EINVAL); | |
804 | __leave; | |
805 | } | |
7b487ba9 | 806 | |
3f3bd101 CV |
807 | mqhdr = mqinfo->mqi_hdr; /* struct pointer */ |
808 | mptr = (int8_t *) mqhdr; /* byte pointer */ | |
809 | attr = &mqhdr->mqh_attr; | |
c6d1382a | 810 | if ((n = ipc_mutex_lock (mqinfo->mqi_lock, true)) != 0) |
7b487ba9 | 811 | { |
3f3bd101 CV |
812 | errno = n; |
813 | __leave; | |
7b487ba9 | 814 | } |
3f3bd101 CV |
815 | ipc_mutex_locked = true; |
816 | if (len > (size_t) attr->mq_msgsize) | |
7b487ba9 | 817 | { |
3f3bd101 CV |
818 | set_errno (EMSGSIZE); |
819 | __leave; | |
7b487ba9 | 820 | } |
3f3bd101 | 821 | if (attr->mq_curmsgs == 0) |
b994b837 | 822 | { |
3f3bd101 | 823 | if (mqhdr->mqh_pid != 0 && mqhdr->mqh_nwait == 0) |
b994b837 | 824 | { |
3f3bd101 CV |
825 | sigev = &mqhdr->mqh_event; |
826 | if (sigev->sigev_notify == SIGEV_SIGNAL) | |
827 | sigqueue (mqhdr->mqh_pid, sigev->sigev_signo, | |
828 | sigev->sigev_value); | |
829 | mqhdr->mqh_pid = 0; /* unregister */ | |
830 | } | |
831 | } | |
832 | else if (attr->mq_curmsgs >= attr->mq_maxmsg) | |
833 | { | |
834 | /* Queue is full */ | |
835 | if (mqinfo->mqi_flags & O_NONBLOCK) | |
836 | { | |
837 | set_errno (EAGAIN); | |
838 | __leave; | |
839 | } | |
840 | /* Wait for room for one message on the queue */ | |
841 | while (attr->mq_curmsgs >= attr->mq_maxmsg) | |
842 | { | |
843 | int ret = ipc_cond_timedwait (mqinfo->mqi_waitsend, | |
844 | mqinfo->mqi_lock, abstime); | |
845 | if (ret != 0) | |
846 | { | |
847 | set_errno (ret); | |
848 | __leave; | |
849 | } | |
b994b837 CV |
850 | } |
851 | } | |
7b487ba9 | 852 | |
3f3bd101 CV |
853 | /* nmsghdr will point to new message */ |
854 | if ((freeindex = mqhdr->mqh_free) == 0) | |
855 | api_fatal ("mq_send: curmsgs = %ld; free = 0", attr->mq_curmsgs); | |
7b487ba9 | 856 | |
3f3bd101 CV |
857 | nmsghdr = (struct msg_hdr *) &mptr[freeindex]; |
858 | nmsghdr->msg_prio = prio; | |
859 | nmsghdr->msg_len = len; | |
860 | memcpy (nmsghdr + 1, ptr, len); /* copy message from caller */ | |
861 | mqhdr->mqh_free = nmsghdr->msg_next; /* new freelist head */ | |
7b487ba9 | 862 | |
3f3bd101 CV |
863 | /* Find right place for message in linked list */ |
864 | index = mqhdr->mqh_head; | |
865 | pmsghdr = (struct msg_hdr *) &(mqhdr->mqh_head); | |
866 | while (index) | |
7b487ba9 | 867 | { |
3f3bd101 CV |
868 | msghdr = (struct msg_hdr *) &mptr[index]; |
869 | if (prio > msghdr->msg_prio) | |
870 | { | |
871 | nmsghdr->msg_next = index; | |
872 | pmsghdr->msg_next = freeindex; | |
873 | break; | |
874 | } | |
875 | index = msghdr->msg_next; | |
876 | pmsghdr = msghdr; | |
877 | } | |
878 | if (index == 0) | |
879 | { | |
880 | /* Queue was empty or new goes at end of list */ | |
7b487ba9 | 881 | pmsghdr->msg_next = freeindex; |
3f3bd101 | 882 | nmsghdr->msg_next = 0; |
7b487ba9 | 883 | } |
3f3bd101 CV |
884 | /* Wake up anyone blocked in mq_receive waiting for a message */ |
885 | if (attr->mq_curmsgs == 0) | |
886 | ipc_cond_signal (mqinfo->mqi_waitrecv); | |
887 | attr->mq_curmsgs++; | |
7b487ba9 | 888 | |
3f3bd101 CV |
889 | ipc_mutex_unlock (mqinfo->mqi_lock); |
890 | ret = 0; | |
891 | } | |
892 | __except (EBADF) {} | |
893 | __endtry | |
894 | if (ipc_mutex_locked) | |
895 | ipc_mutex_unlock (mqinfo->mqi_lock); | |
896 | return ret; | |
7b487ba9 CV |
897 | } |
898 | ||
899 | extern "C" int | |
900 | mq_send (mqd_t mqd, const char *ptr, size_t len, unsigned int prio) | |
901 | { | |
902 | return _mq_send (mqd, ptr, len, prio, NULL); | |
903 | } | |
904 | ||
905 | extern "C" int | |
906 | mq_timedsend (mqd_t mqd, const char *ptr, size_t len, unsigned int prio, | |
907 | const struct timespec *abstime) | |
908 | { | |
909 | return _mq_send (mqd, ptr, len, prio, abstime); | |
910 | } | |
911 | ||
912 | static ssize_t | |
913 | _mq_receive (mqd_t mqd, char *ptr, size_t maxlen, unsigned int *priop, | |
914 | const struct timespec *abstime) | |
915 | { | |
916 | int n; | |
917 | long index; | |
918 | int8_t *mptr; | |
3f3bd101 | 919 | ssize_t len = -1; |
7b44665a | 920 | struct mq_hdr *mqhdr; |
61522196 | 921 | struct mq_fattr *attr; |
7b487ba9 | 922 | struct msg_hdr *msghdr; |
3f3bd101 CV |
923 | struct mq_info *mqinfo = (struct mq_info *) mqd; |
924 | bool ipc_mutex_locked = false; | |
7b487ba9 | 925 | |
74f9ac5b CV |
926 | pthread_testcancel (); |
927 | ||
3f3bd101 | 928 | __try |
7b487ba9 | 929 | { |
3f3bd101 CV |
930 | if (mqinfo->mqi_magic != MQI_MAGIC) |
931 | { | |
932 | set_errno (EBADF); | |
933 | __leave; | |
934 | } | |
935 | mqhdr = mqinfo->mqi_hdr; /* struct pointer */ | |
936 | mptr = (int8_t *) mqhdr; /* byte pointer */ | |
937 | attr = &mqhdr->mqh_attr; | |
c6d1382a | 938 | if ((n = ipc_mutex_lock (mqinfo->mqi_lock, true)) != 0) |
3f3bd101 CV |
939 | { |
940 | errno = n; | |
941 | __leave; | |
942 | } | |
943 | ipc_mutex_locked = true; | |
944 | if (maxlen < (size_t) attr->mq_msgsize) | |
7b487ba9 | 945 | { |
3f3bd101 CV |
946 | set_errno (EMSGSIZE); |
947 | __leave; | |
7b487ba9 | 948 | } |
3f3bd101 | 949 | if (attr->mq_curmsgs == 0) /* queue is empty */ |
b994b837 | 950 | { |
3f3bd101 | 951 | if (mqinfo->mqi_flags & O_NONBLOCK) |
b994b837 | 952 | { |
3f3bd101 CV |
953 | set_errno (EAGAIN); |
954 | __leave; | |
b994b837 | 955 | } |
3f3bd101 CV |
956 | /* Wait for a message to be placed onto queue */ |
957 | mqhdr->mqh_nwait++; | |
958 | while (attr->mq_curmsgs == 0) | |
959 | { | |
960 | int ret = ipc_cond_timedwait (mqinfo->mqi_waitrecv, | |
961 | mqinfo->mqi_lock, abstime); | |
962 | if (ret != 0) | |
963 | { | |
964 | set_errno (ret); | |
965 | __leave; | |
966 | } | |
967 | } | |
968 | mqhdr->mqh_nwait--; | |
b994b837 | 969 | } |
7b487ba9 | 970 | |
3f3bd101 CV |
971 | if ((index = mqhdr->mqh_head) == 0) |
972 | api_fatal ("mq_receive: curmsgs = %ld; head = 0", attr->mq_curmsgs); | |
7b487ba9 | 973 | |
3f3bd101 CV |
974 | msghdr = (struct msg_hdr *) &mptr[index]; |
975 | mqhdr->mqh_head = msghdr->msg_next; /* new head of list */ | |
976 | len = msghdr->msg_len; | |
977 | memcpy(ptr, msghdr + 1, len); /* copy the message itself */ | |
978 | if (priop != NULL) | |
979 | *priop = msghdr->msg_prio; | |
980 | ||
981 | /* Just-read message goes to front of free list */ | |
982 | msghdr->msg_next = mqhdr->mqh_free; | |
983 | mqhdr->mqh_free = index; | |
7b487ba9 | 984 | |
3f3bd101 CV |
985 | /* Wake up anyone blocked in mq_send waiting for room */ |
986 | if (attr->mq_curmsgs == attr->mq_maxmsg) | |
987 | ipc_cond_signal (mqinfo->mqi_waitsend); | |
988 | attr->mq_curmsgs--; | |
7b487ba9 | 989 | |
3f3bd101 CV |
990 | ipc_mutex_unlock (mqinfo->mqi_lock); |
991 | } | |
992 | __except (EBADF) {} | |
993 | __endtry | |
994 | if (ipc_mutex_locked) | |
995 | ipc_mutex_unlock (mqinfo->mqi_lock); | |
7b487ba9 | 996 | return len; |
7b487ba9 CV |
997 | } |
998 | ||
999 | extern "C" ssize_t | |
1000 | mq_receive (mqd_t mqd, char *ptr, size_t maxlen, unsigned int *priop) | |
1001 | { | |
1002 | return _mq_receive (mqd, ptr, maxlen, priop, NULL); | |
1003 | } | |
1004 | ||
1005 | extern "C" ssize_t | |
1006 | mq_timedreceive (mqd_t mqd, char *ptr, size_t maxlen, unsigned int *priop, | |
1007 | const struct timespec *abstime) | |
1008 | { | |
1009 | return _mq_receive (mqd, ptr, maxlen, priop, abstime); | |
1010 | } | |
1011 | ||
1012 | extern "C" int | |
1013 | mq_close (mqd_t mqd) | |
1014 | { | |
1015 | long msgsize, filesize; | |
1016 | struct mq_hdr *mqhdr; | |
61522196 | 1017 | struct mq_fattr *attr; |
7b487ba9 CV |
1018 | struct mq_info *mqinfo; |
1019 | ||
3f3bd101 | 1020 | __try |
7b487ba9 | 1021 | { |
3f3bd101 CV |
1022 | mqinfo = (struct mq_info *) mqd; |
1023 | if (mqinfo->mqi_magic != MQI_MAGIC) | |
1024 | { | |
1025 | set_errno (EBADF); | |
1026 | __leave; | |
1027 | } | |
1028 | mqhdr = mqinfo->mqi_hdr; | |
1029 | attr = &mqhdr->mqh_attr; | |
7b487ba9 | 1030 | |
3f3bd101 CV |
1031 | if (mq_notify (mqd, NULL)) /* unregister calling process */ |
1032 | __leave; | |
7b487ba9 | 1033 | |
3f3bd101 CV |
1034 | msgsize = MSGSIZE (attr->mq_msgsize); |
1035 | filesize = sizeof (struct mq_hdr) | |
1036 | + (attr->mq_maxmsg * (sizeof (struct msg_hdr) + msgsize)); | |
1037 | if (munmap (mqinfo->mqi_hdr, filesize) == -1) | |
1038 | __leave; | |
7b487ba9 | 1039 | |
3f3bd101 CV |
1040 | mqinfo->mqi_magic = 0; /* just in case */ |
1041 | ipc_cond_close (mqinfo->mqi_waitsend); | |
1042 | ipc_cond_close (mqinfo->mqi_waitrecv); | |
1043 | ipc_mutex_close (mqinfo->mqi_lock); | |
1044 | free (mqinfo); | |
1045 | return 0; | |
1046 | } | |
1047 | __except (EBADF) {} | |
1048 | __endtry | |
1049 | return -1; | |
7b487ba9 CV |
1050 | } |
1051 | ||
1052 | extern "C" int | |
1053 | mq_unlink (const char *name) | |
1054 | { | |
547ad329 CV |
1055 | size_t len = strlen (name); |
1056 | char mqname[ipc_names[mqueue].prefix_len + len]; | |
7b487ba9 | 1057 | |
547ad329 | 1058 | if (!check_path (mqname, mqueue, name, len)) |
7b487ba9 CV |
1059 | return -1; |
1060 | if (unlink (mqname) == -1) | |
1061 | return -1; | |
1062 | return 0; | |
1063 | } | |
1064 | ||
8fbd574e CV |
1065 | /* POSIX named semaphore implementation. Loosely based on Richard W. STEPHENS |
1066 | implementation as far as sem_open is concerned, but under the hood using | |
1067 | the already existing semaphore class in thread.cc. Using a file backed | |
1068 | solution allows to implement kernel persistent named semaphores. */ | |
1069 | ||
1070 | struct sem_finfo | |
1071 | { | |
1072 | unsigned int value; | |
1073 | unsigned long long hash; | |
1074 | LUID luid; | |
1075 | }; | |
1076 | ||
1077 | extern "C" sem_t * | |
1078 | sem_open (const char *name, int oflag, ...) | |
1079 | { | |
3f3bd101 | 1080 | int i, fd = -1, created = 0; |
8fbd574e CV |
1081 | va_list ap; |
1082 | mode_t mode = 0; | |
1083 | unsigned int value = 0; | |
61522196 | 1084 | struct stat statbuff; |
8fbd574e CV |
1085 | sem_t *sem = SEM_FAILED; |
1086 | sem_finfo sf; | |
8fbd574e CV |
1087 | bool wasopen = false; |
1088 | ipc_flock file; | |
1089 | ||
547ad329 CV |
1090 | size_t len = strlen (name); |
1091 | char semname[ipc_names[semaphore].prefix_len + len]; | |
1092 | ||
1093 | if (!check_path (semname, semaphore, name, len)) | |
8fbd574e CV |
1094 | return SEM_FAILED; |
1095 | ||
3f3bd101 | 1096 | __try |
8fbd574e | 1097 | { |
3f3bd101 CV |
1098 | oflag &= (O_CREAT | O_EXCL); |
1099 | ||
1100 | again: | |
1101 | if (oflag & O_CREAT) | |
7b44665a | 1102 | { |
3f3bd101 CV |
1103 | va_start (ap, oflag); /* init ap to final named argument */ |
1104 | mode = va_arg (ap, mode_t) & ~S_IXUSR; | |
1105 | value = va_arg (ap, unsigned int); | |
1106 | va_end (ap); | |
1107 | ||
1108 | /* Open and specify O_EXCL and user-execute */ | |
1109 | fd = open (semname, oflag | O_EXCL | O_RDWR | O_CLOEXEC, | |
1110 | mode | S_IXUSR); | |
1111 | if (fd < 0) | |
1112 | { | |
1113 | if (errno == EEXIST && (oflag & O_EXCL) == 0) | |
1114 | goto exists; /* already exists, OK */ | |
1115 | return SEM_FAILED; | |
1116 | } | |
1117 | created = 1; | |
1118 | /* First one to create the file initializes it. */ | |
1119 | NtAllocateLocallyUniqueId (&sf.luid); | |
1120 | sf.value = value; | |
1121 | sf.hash = hash_path_name (0, semname); | |
1122 | if (write (fd, &sf, sizeof sf) != sizeof sf) | |
1123 | __leave; | |
1124 | sem = semaphore::open (sf.hash, sf.luid, fd, oflag, mode, value, | |
1125 | wasopen); | |
1126 | if (sem == SEM_FAILED) | |
1127 | __leave; | |
1128 | /* Initialization complete, turn off user-execute bit */ | |
1129 | if (fchmod (fd, mode) == -1) | |
1130 | __leave; | |
1131 | /* Don't close (fd); */ | |
1132 | return sem; | |
8fbd574e | 1133 | } |
8fbd574e | 1134 | |
3f3bd101 CV |
1135 | exists: |
1136 | /* Open the file and fetch the semaphore name. */ | |
1137 | if ((fd = open (semname, O_RDWR | O_CLOEXEC)) < 0) | |
8fbd574e CV |
1138 | { |
1139 | if (errno == ENOENT && (oflag & O_CREAT)) | |
3f3bd101 CV |
1140 | goto again; |
1141 | __leave; | |
1142 | } | |
1143 | /* Make certain initialization is complete */ | |
1144 | for (i = 0; i < MAX_TRIES; i++) | |
1145 | { | |
1146 | if (stat64 (semname, &statbuff) == -1) | |
8fbd574e | 1147 | { |
3f3bd101 CV |
1148 | if (errno == ENOENT && (oflag & O_CREAT)) |
1149 | { | |
1150 | close (fd); | |
1151 | fd = -1; | |
1152 | goto again; | |
1153 | } | |
1154 | __leave; | |
8fbd574e | 1155 | } |
3f3bd101 CV |
1156 | if ((statbuff.st_mode & S_IXUSR) == 0) |
1157 | break; | |
1158 | sleep (1); | |
8fbd574e | 1159 | } |
3f3bd101 CV |
1160 | if (i == MAX_TRIES) |
1161 | { | |
1162 | set_errno (ETIMEDOUT); | |
1163 | __leave; | |
1164 | } | |
1165 | if (file.lock (fd, sizeof sf)) | |
1166 | __leave; | |
1167 | if (read (fd, &sf, sizeof sf) != sizeof sf) | |
1168 | __leave; | |
1169 | sem = semaphore::open (sf.hash, sf.luid, fd, oflag, mode, sf.value, | |
1170 | wasopen); | |
1171 | file.unlock (fd); | |
1172 | if (sem == SEM_FAILED) | |
1173 | __leave; | |
1174 | /* If wasopen is set, the semaphore was already opened and we already have | |
1175 | an open file descriptor pointing to the file. This means, we have to | |
1176 | close the file descriptor created in this call. It won't be stored | |
1177 | anywhere anyway. */ | |
1178 | if (wasopen) | |
1179 | close (fd); | |
1180 | return sem; | |
8fbd574e | 1181 | } |
3f3bd101 CV |
1182 | __except (EFAULT) {} |
1183 | __endtry | |
8fbd574e CV |
1184 | /* Don't let following function calls change errno */ |
1185 | save_errno save; | |
1186 | ||
3f3bd101 CV |
1187 | if (fd >= 0) |
1188 | file.unlock (fd); | |
8fbd574e CV |
1189 | if (created) |
1190 | unlink (semname); | |
1191 | if (sem != SEM_FAILED) | |
1192 | semaphore::close (sem); | |
599d462d CV |
1193 | if (fd >= 0) |
1194 | close (fd); | |
8fbd574e CV |
1195 | return SEM_FAILED; |
1196 | } | |
1197 | ||
1198 | int | |
1199 | _sem_close (sem_t *sem, bool do_close) | |
1200 | { | |
1201 | sem_finfo sf; | |
1202 | int fd, ret = -1; | |
1203 | ipc_flock file; | |
1204 | ||
1205 | if (semaphore::getinternal (sem, &fd, &sf.hash, &sf.luid, &sf.value) == -1) | |
1206 | return -1; | |
1207 | if (!file.lock (fd, sizeof sf) | |
61522196 | 1208 | && lseek64 (fd, 0LL, SEEK_SET) != (off_t) -1 |
8fbd574e CV |
1209 | && write (fd, &sf, sizeof sf) == sizeof sf) |
1210 | ret = do_close ? semaphore::close (sem) : 0; | |
1211 | ||
1212 | /* Don't let following function calls change errno */ | |
1213 | save_errno save; | |
1214 | file.unlock (fd); | |
1215 | close (fd); | |
1216 | ||
1217 | return ret; | |
1218 | } | |
1219 | ||
1220 | extern "C" int | |
1221 | sem_close (sem_t *sem) | |
1222 | { | |
1223 | return _sem_close (sem, true); | |
1224 | } | |
1225 | ||
1226 | extern "C" int | |
1227 | sem_unlink (const char *name) | |
1228 | { | |
547ad329 CV |
1229 | size_t len = strlen (name); |
1230 | char semname[ipc_names[semaphore].prefix_len + len]; | |
8fbd574e | 1231 | |
547ad329 | 1232 | if (!check_path (semname, semaphore, name, len)) |
8fbd574e CV |
1233 | return -1; |
1234 | if (unlink (semname) == -1) | |
1235 | return -1; | |
1236 | return 0; | |
1237 | } |