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Commit | Line | Data |
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7b487ba9 CV |
1 | /* posix_ipc.cc: POSIX IPC API for Cygwin. |
2 | ||
b994b837 | 3 | Copyright 2007, 2008, 2009, 2010, 2011 Red Hat, Inc. |
7b487ba9 CV |
4 | |
5 | This file is part of Cygwin. | |
6 | ||
7 | This software is a copyrighted work licensed under the terms of the | |
8 | Cygwin license. Please consult the file "CYGWIN_LICENSE" for | |
9 | details. */ | |
10 | ||
7b487ba9 | 11 | #include "winsup.h" |
3748b3e8 | 12 | #include "shared_info.h" |
8fbd574e | 13 | #include "thread.h" |
7b487ba9 | 14 | #include "path.h" |
7b487ba9 | 15 | #include "cygtls.h" |
e6fbf13e CV |
16 | #include "fhandler.h" |
17 | #include "dtable.h" | |
18 | #include "cygheap.h" | |
7b487ba9 | 19 | #include "sigproc.h" |
abbde487 | 20 | #include "ntdll.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 | |
547ad329 CV |
28 | /* The prefix_len is the length of the path prefix ncluding trailing "/" |
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 | } | |
b32c31d1 CV |
69 | /* Name must not be empty, or just be a single slash, or start with more |
70 | than one slash. Same for backslash. | |
71 | Apart from handling backslash like slash, the naming rules are identical | |
72 | to Linux, including the names and requirements for subdirectories, if | |
73 | the name contains further slashes. */ | |
74 | if (!name || (strchr ("/\\", name[0]) | |
75 | && (!name[1] || strchr ("/\\", name[1])))) | |
7b487ba9 CV |
76 | { |
77 | debug_printf ("Invalid %s name '%s'", ipc_names[type].description, name); | |
78 | set_errno (EINVAL); | |
79 | return false; | |
80 | } | |
b32c31d1 CV |
81 | /* Skip leading (back-)slash. */ |
82 | if (strchr ("/\\", name[0])) | |
83 | ++name; | |
547ad329 | 84 | if (len > PATH_MAX - ipc_names[type].prefix_len) |
7b487ba9 CV |
85 | { |
86 | debug_printf ("%s name '%s' too long", ipc_names[type].description, name); | |
87 | set_errno (ENAMETOOLONG); | |
88 | return false; | |
89 | } | |
8fbd574e CV |
90 | __small_sprintf (res_name, "%s/%s%s", ipc_names[type].prefix, |
91 | type == semaphore ? "sem." : "", | |
b32c31d1 | 92 | name); |
7b487ba9 CV |
93 | return true; |
94 | } | |
95 | ||
96 | static int | |
97 | ipc_mutex_init (HANDLE *pmtx, const char *name) | |
98 | { | |
3748b3e8 CV |
99 | WCHAR buf[MAX_PATH]; |
100 | UNICODE_STRING uname; | |
101 | OBJECT_ATTRIBUTES attr; | |
102 | NTSTATUS status; | |
103 | ||
104 | __small_swprintf (buf, L"mqueue/mtx_%s", name); | |
105 | RtlInitUnicodeString (&uname, buf); | |
106 | InitializeObjectAttributes (&attr, &uname, | |
107 | OBJ_INHERIT | OBJ_OPENIF | OBJ_CASE_INSENSITIVE, | |
108 | get_shared_parent_dir (), | |
109 | everyone_sd (CYG_MUTANT_ACCESS)); | |
110 | status = NtCreateMutant (pmtx, CYG_MUTANT_ACCESS, &attr, FALSE); | |
111 | if (!NT_SUCCESS (status)) | |
112 | { | |
113 | debug_printf ("NtCreateMutant: %p", status); | |
114 | return geterrno_from_win_error (RtlNtStatusToDosError (status)); | |
115 | } | |
116 | return 0; | |
7b487ba9 CV |
117 | } |
118 | ||
119 | static int | |
120 | ipc_mutex_lock (HANDLE mtx) | |
121 | { | |
122 | HANDLE h[2] = { mtx, signal_arrived }; | |
123 | ||
124 | switch (WaitForMultipleObjects (2, h, FALSE, INFINITE)) | |
7b44665a | 125 | { |
7b487ba9 CV |
126 | case WAIT_OBJECT_0: |
127 | case WAIT_ABANDONED_0: | |
128 | return 0; | |
129 | case WAIT_OBJECT_0 + 1: | |
130 | set_errno (EINTR); | |
131 | return 1; | |
132 | default: | |
133 | break; | |
7b44665a | 134 | } |
7b487ba9 CV |
135 | return geterrno_from_win_error (); |
136 | } | |
137 | ||
138 | static inline int | |
139 | ipc_mutex_unlock (HANDLE mtx) | |
140 | { | |
141 | return ReleaseMutex (mtx) ? 0 : geterrno_from_win_error (); | |
142 | } | |
143 | ||
144 | static inline int | |
145 | ipc_mutex_close (HANDLE mtx) | |
146 | { | |
147 | return CloseHandle (mtx) ? 0 : geterrno_from_win_error (); | |
148 | } | |
149 | ||
150 | static int | |
3748b3e8 | 151 | ipc_cond_init (HANDLE *pevt, const char *name, char sr) |
7b487ba9 | 152 | { |
3748b3e8 CV |
153 | WCHAR buf[MAX_PATH]; |
154 | UNICODE_STRING uname; | |
155 | OBJECT_ATTRIBUTES attr; | |
156 | NTSTATUS status; | |
157 | ||
158 | __small_swprintf (buf, L"mqueue/evt_%s%c", name, sr); | |
159 | RtlInitUnicodeString (&uname, buf); | |
160 | InitializeObjectAttributes (&attr, &uname, | |
161 | OBJ_INHERIT | OBJ_OPENIF | OBJ_CASE_INSENSITIVE, | |
162 | get_shared_parent_dir (), | |
163 | everyone_sd (CYG_EVENT_ACCESS)); | |
164 | status = NtCreateEvent (pevt, CYG_EVENT_ACCESS, &attr, | |
165 | NotificationEvent, FALSE); | |
166 | if (!NT_SUCCESS (status)) | |
167 | { | |
168 | debug_printf ("NtCreateEvent: %p", status); | |
169 | return geterrno_from_win_error (RtlNtStatusToDosError (status)); | |
170 | } | |
171 | return 0; | |
7b487ba9 CV |
172 | } |
173 | ||
174 | static int | |
175 | ipc_cond_timedwait (HANDLE evt, HANDLE mtx, const struct timespec *abstime) | |
176 | { | |
206a6ee9 CV |
177 | pthread_t thread; |
178 | HANDLE w4[4] = { evt, signal_arrived, NULL, NULL }; | |
86bf572e | 179 | DWORD cnt = 2; |
206a6ee9 | 180 | DWORD timer_idx = 0; |
86bf572e CV |
181 | int ret = 0; |
182 | ||
206a6ee9 CV |
183 | thread = pthread::self (); |
184 | if (thread && thread->cancel_event) | |
185 | w4[cnt++] = thread->cancel_event; | |
86bf572e CV |
186 | if (abstime) |
187 | { | |
188 | if (abstime->tv_sec < 0 | |
189 | || abstime->tv_nsec < 0 | |
190 | || abstime->tv_nsec > 999999999) | |
191 | return EINVAL; | |
192 | ||
193 | /* If a timeout is set, we create a waitable timer to wait for. | |
194 | This is the easiest way to handle the absolute timeout value, given | |
195 | that NtSetTimer also takes absolute times and given the double | |
196 | dependency on evt *and* mtx, which requires to call WFMO twice. */ | |
197 | NTSTATUS status; | |
198 | LARGE_INTEGER duetime; | |
199 | ||
206a6ee9 CV |
200 | timer_idx = cnt++; |
201 | status = NtCreateTimer (&w4[timer_idx], TIMER_ALL_ACCESS, NULL, | |
86bf572e CV |
202 | NotificationTimer); |
203 | if (!NT_SUCCESS (status)) | |
204 | return geterrno_from_nt_status (status); | |
205 | timespec_to_filetime (abstime, (FILETIME *) &duetime); | |
206a6ee9 | 206 | status = NtSetTimer (w4[timer_idx], &duetime, NULL, NULL, FALSE, 0, NULL); |
86bf572e CV |
207 | if (!NT_SUCCESS (status)) |
208 | { | |
206a6ee9 | 209 | NtClose (w4[timer_idx]); |
86bf572e CV |
210 | return geterrno_from_nt_status (status); |
211 | } | |
7b487ba9 | 212 | } |
3748b3e8 | 213 | ResetEvent (evt); |
86bf572e CV |
214 | if ((ret = ipc_mutex_unlock (mtx)) != 0) |
215 | return ret; | |
216 | /* Everything's set up, so now wait for the event to be signalled. */ | |
217 | restart1: | |
218 | switch (WaitForMultipleObjects (cnt, w4, FALSE, INFINITE)) | |
7b44665a | 219 | { |
7b487ba9 | 220 | case WAIT_OBJECT_0: |
86bf572e CV |
221 | break; |
222 | case WAIT_OBJECT_0 + 1: | |
223 | if (_my_tls.call_signal_handler ()) | |
224 | goto restart1; | |
225 | ret = EINTR; | |
226 | break; | |
227 | case WAIT_OBJECT_0 + 2: | |
206a6ee9 CV |
228 | if (timer_idx != 2) |
229 | pthread_testcancel (); | |
230 | /*FALLTHRU*/ | |
231 | case WAIT_OBJECT_0 + 3: | |
86bf572e CV |
232 | ret = ETIMEDOUT; |
233 | break; | |
7b487ba9 | 234 | default: |
86bf572e | 235 | ret = geterrno_from_win_error (); |
7b487ba9 | 236 | break; |
7b44665a | 237 | } |
86bf572e CV |
238 | if (ret == 0) |
239 | { | |
240 | /* At this point we need to lock the mutex. The wait is practically | |
241 | the same as before, just that we now wait on the mutex instead of the | |
242 | event. */ | |
243 | restart2: | |
244 | w4[0] = mtx; | |
245 | switch (WaitForMultipleObjects (cnt, w4, FALSE, INFINITE)) | |
246 | { | |
247 | case WAIT_OBJECT_0: | |
248 | case WAIT_ABANDONED_0: | |
249 | break; | |
250 | case WAIT_OBJECT_0 + 1: | |
251 | if (_my_tls.call_signal_handler ()) | |
252 | goto restart2; | |
253 | ret = EINTR; | |
254 | break; | |
255 | case WAIT_OBJECT_0 + 2: | |
206a6ee9 CV |
256 | if (timer_idx != 2) |
257 | pthread_testcancel (); | |
258 | /*FALLTHRU*/ | |
259 | case WAIT_OBJECT_0 + 3: | |
86bf572e CV |
260 | ret = ETIMEDOUT; |
261 | break; | |
262 | default: | |
263 | ret = geterrno_from_win_error (); | |
264 | break; | |
265 | } | |
266 | } | |
206a6ee9 | 267 | if (timer_idx) |
86bf572e CV |
268 | { |
269 | if (ret != ETIMEDOUT) | |
206a6ee9 CV |
270 | NtCancelTimer (w4[timer_idx], NULL); |
271 | NtClose (w4[timer_idx]); | |
86bf572e CV |
272 | } |
273 | return ret; | |
7b487ba9 CV |
274 | } |
275 | ||
86bf572e | 276 | static inline void |
7b487ba9 CV |
277 | ipc_cond_signal (HANDLE evt) |
278 | { | |
86bf572e | 279 | SetEvent (evt); |
7b487ba9 CV |
280 | } |
281 | ||
86bf572e | 282 | static inline void |
7b487ba9 CV |
283 | ipc_cond_close (HANDLE evt) |
284 | { | |
86bf572e | 285 | CloseHandle (evt); |
7b487ba9 CV |
286 | } |
287 | ||
8fbd574e CV |
288 | class ipc_flock |
289 | { | |
290 | struct __flock64 fl; | |
291 | ||
292 | public: | |
293 | ipc_flock () { memset (&fl, 0, sizeof fl); } | |
294 | ||
295 | int lock (int fd, size_t size) | |
296 | { | |
297 | fl.l_type = F_WRLCK; | |
298 | fl.l_whence = SEEK_SET; | |
299 | fl.l_start = 0; | |
300 | fl.l_len = size; | |
fabfb1a1 | 301 | return fcntl64 (fd, F_SETLKW, &fl); |
8fbd574e CV |
302 | } |
303 | int unlock (int fd) | |
304 | { | |
305 | if (!fl.l_len) | |
306 | return 0; | |
307 | fl.l_type = F_UNLCK; | |
fabfb1a1 | 308 | return fcntl64 (fd, F_SETLKW, &fl); |
8fbd574e CV |
309 | } |
310 | }; | |
311 | ||
7b487ba9 CV |
312 | /* POSIX shared memory object implementation. */ |
313 | ||
314 | extern "C" int | |
315 | shm_open (const char *name, int oflag, mode_t mode) | |
316 | { | |
547ad329 CV |
317 | size_t len = strlen (name); |
318 | char shmname[ipc_names[shmem].prefix_len + len]; | |
7b487ba9 | 319 | |
547ad329 | 320 | if (!check_path (shmname, shmem, name, len)) |
7b487ba9 CV |
321 | return -1; |
322 | ||
323 | /* Check for valid flags. */ | |
324 | if (((oflag & O_ACCMODE) != O_RDONLY && (oflag & O_ACCMODE) != O_RDWR) | |
325 | || (oflag & ~(O_ACCMODE | O_CREAT | O_EXCL | O_TRUNC))) | |
326 | { | |
327 | debug_printf ("Invalid oflag 0%o", oflag); | |
328 | set_errno (EINVAL); | |
329 | return -1; | |
330 | } | |
331 | ||
e70fdfb9 | 332 | return open (shmname, oflag | O_CLOEXEC, mode & 0777); |
7b487ba9 CV |
333 | } |
334 | ||
335 | extern "C" int | |
336 | shm_unlink (const char *name) | |
337 | { | |
547ad329 CV |
338 | size_t len = strlen (name); |
339 | char shmname[ipc_names[shmem].prefix_len + len]; | |
7b487ba9 | 340 | |
547ad329 | 341 | if (!check_path (shmname, shmem, name, len)) |
7b487ba9 CV |
342 | return -1; |
343 | ||
344 | return unlink (shmname); | |
345 | } | |
346 | ||
347 | /* The POSIX message queue implementation is based on W. Richard STEVENS | |
348 | implementation, just tweaked for Cygwin. The main change is | |
349 | the usage of Windows mutexes and events instead of using the pthread | |
350 | synchronization objects. The pathname is massaged so that the | |
351 | files are created under /dev/mqueue. mq_timedsend and mq_timedreceive | |
352 | are implemented additionally. */ | |
353 | ||
354 | struct mq_hdr | |
355 | { | |
93162be5 CV |
356 | struct mq_attr mqh_attr; /* the queue's attributes */ |
357 | long mqh_head; /* index of first message */ | |
358 | long mqh_free; /* index of first free message */ | |
359 | long mqh_nwait; /* #threads blocked in mq_receive() */ | |
360 | pid_t mqh_pid; /* nonzero PID if mqh_event set */ | |
8fbd574e | 361 | char mqh_uname[36]; /* unique name used to identify synchronization |
7b44665a | 362 | objects connected to this queue */ |
93162be5 | 363 | struct sigevent mqh_event; /* for mq_notify() */ |
7b487ba9 CV |
364 | }; |
365 | ||
366 | struct msg_hdr | |
367 | { | |
93162be5 CV |
368 | long msg_next; /* index of next on linked list */ |
369 | ssize_t msg_len; /* actual length */ | |
370 | unsigned int msg_prio; /* priority */ | |
7b487ba9 CV |
371 | }; |
372 | ||
373 | struct mq_info | |
374 | { | |
93162be5 CV |
375 | struct mq_hdr *mqi_hdr; /* start of mmap'ed region */ |
376 | unsigned long mqi_magic; /* magic number if open */ | |
377 | int mqi_flags; /* flags for this process */ | |
378 | HANDLE mqi_lock; /* mutex lock */ | |
3748b3e8 CV |
379 | HANDLE mqi_waitsend; /* and condition variable for full queue */ |
380 | HANDLE mqi_waitrecv; /* and condition variable for empty queue */ | |
7b487ba9 CV |
381 | }; |
382 | ||
383 | #define MQI_MAGIC 0x98765432UL | |
384 | ||
385 | #define MSGSIZE(i) roundup((i), sizeof(long)) | |
386 | ||
387 | #define MAX_TRIES 10 /* for waiting for initialization */ | |
388 | ||
389 | struct mq_attr defattr = { 0, 10, 8192, 0 }; /* Linux defaults. */ | |
390 | ||
391 | extern "C" _off64_t lseek64 (int, _off64_t, int); | |
392 | extern "C" void *mmap64 (void *, size_t, int, int, int, _off64_t); | |
393 | ||
394 | extern "C" mqd_t | |
395 | mq_open (const char *name, int oflag, ...) | |
396 | { | |
599d462d | 397 | int i, fd = -1, nonblock, created; |
7b487ba9 | 398 | long msgsize, index; |
eb8a6636 | 399 | _off64_t filesize = 0; |
7b487ba9 CV |
400 | va_list ap; |
401 | mode_t mode; | |
402 | int8_t *mptr; | |
403 | struct __stat64 statbuff; | |
404 | struct mq_hdr *mqhdr; | |
405 | struct msg_hdr *msghdr; | |
406 | struct mq_attr *attr; | |
407 | struct mq_info *mqinfo; | |
8fbd574e | 408 | LUID luid; |
7b487ba9 | 409 | |
547ad329 CV |
410 | size_t len = strlen (name); |
411 | char mqname[ipc_names[mqueue].prefix_len + len]; | |
412 | ||
413 | if (!check_path (mqname, mqueue, name, len)) | |
7b487ba9 CV |
414 | return (mqd_t) -1; |
415 | ||
416 | myfault efault; | |
417 | if (efault.faulted (EFAULT)) | |
8fbd574e | 418 | return (mqd_t) -1; |
7b487ba9 | 419 | |
8fbd574e | 420 | oflag &= (O_CREAT | O_EXCL | O_NONBLOCK); |
7b487ba9 CV |
421 | created = 0; |
422 | nonblock = oflag & O_NONBLOCK; | |
423 | oflag &= ~O_NONBLOCK; | |
424 | mptr = (int8_t *) MAP_FAILED; | |
425 | mqinfo = NULL; | |
426 | ||
427 | again: | |
428 | if (oflag & O_CREAT) | |
429 | { | |
430 | va_start (ap, oflag); /* init ap to final named argument */ | |
431 | mode = va_arg (ap, mode_t) & ~S_IXUSR; | |
432 | attr = va_arg (ap, struct mq_attr *); | |
433 | va_end (ap); | |
434 | ||
435 | /* Open and specify O_EXCL and user-execute */ | |
e70fdfb9 | 436 | fd = open (mqname, oflag | O_EXCL | O_RDWR | O_CLOEXEC, mode | S_IXUSR); |
7b487ba9 | 437 | if (fd < 0) |
7b44665a | 438 | { |
7b487ba9 CV |
439 | if (errno == EEXIST && (oflag & O_EXCL) == 0) |
440 | goto exists; /* already exists, OK */ | |
441 | return (mqd_t) -1; | |
442 | } | |
443 | created = 1; | |
444 | /* First one to create the file initializes it */ | |
445 | if (attr == NULL) | |
446 | attr = &defattr; | |
447 | else if (attr->mq_maxmsg <= 0 || attr->mq_msgsize <= 0) | |
448 | { | |
449 | set_errno (EINVAL); | |
450 | goto err; | |
451 | } | |
452 | /* Calculate and set the file size */ | |
453 | msgsize = MSGSIZE (attr->mq_msgsize); | |
454 | filesize = sizeof (struct mq_hdr) | |
7b44665a | 455 | + (attr->mq_maxmsg * (sizeof (struct msg_hdr) + msgsize)); |
7b487ba9 CV |
456 | if (lseek64 (fd, filesize - 1, SEEK_SET) == -1) |
457 | goto err; | |
458 | if (write (fd, "", 1) == -1) | |
459 | goto err; | |
460 | ||
461 | /* Memory map the file */ | |
462 | mptr = (int8_t *) mmap64 (NULL, (size_t) filesize, PROT_READ | PROT_WRITE, | |
463 | MAP_SHARED, fd, 0); | |
464 | if (mptr == (int8_t *) MAP_FAILED) | |
465 | goto err; | |
466 | ||
467 | /* Allocate one mq_info{} for the queue */ | |
3748b3e8 | 468 | if (!(mqinfo = (struct mq_info *) calloc (1, sizeof (struct mq_info)))) |
7b487ba9 CV |
469 | goto err; |
470 | mqinfo->mqi_hdr = mqhdr = (struct mq_hdr *) mptr; | |
471 | mqinfo->mqi_magic = MQI_MAGIC; | |
472 | mqinfo->mqi_flags = nonblock; | |
473 | ||
474 | /* Initialize header at beginning of file */ | |
475 | /* Create free list with all messages on it */ | |
476 | mqhdr->mqh_attr.mq_flags = 0; | |
477 | mqhdr->mqh_attr.mq_maxmsg = attr->mq_maxmsg; | |
478 | mqhdr->mqh_attr.mq_msgsize = attr->mq_msgsize; | |
479 | mqhdr->mqh_attr.mq_curmsgs = 0; | |
480 | mqhdr->mqh_nwait = 0; | |
481 | mqhdr->mqh_pid = 0; | |
41e9c145 | 482 | NtAllocateLocallyUniqueId (&luid); |
abbde487 | 483 | __small_sprintf (mqhdr->mqh_uname, "%016X%08x%08x", |
8fbd574e CV |
484 | hash_path_name (0,mqname), |
485 | luid.HighPart, luid.LowPart); | |
7b487ba9 CV |
486 | mqhdr->mqh_head = 0; |
487 | index = sizeof (struct mq_hdr); | |
488 | mqhdr->mqh_free = index; | |
489 | for (i = 0; i < attr->mq_maxmsg - 1; i++) | |
490 | { | |
491 | msghdr = (struct msg_hdr *) &mptr[index]; | |
492 | index += sizeof (struct msg_hdr) + msgsize; | |
493 | msghdr->msg_next = index; | |
494 | } | |
495 | msghdr = (struct msg_hdr *) &mptr[index]; | |
496 | msghdr->msg_next = 0; /* end of free list */ | |
497 | ||
3748b3e8 | 498 | /* Initialize mutex & condition variables */ |
93162be5 | 499 | i = ipc_mutex_init (&mqinfo->mqi_lock, mqhdr->mqh_uname); |
7b487ba9 CV |
500 | if (i != 0) |
501 | goto pthreaderr; | |
502 | ||
3748b3e8 CV |
503 | i = ipc_cond_init (&mqinfo->mqi_waitsend, mqhdr->mqh_uname, 'S'); |
504 | if (i != 0) | |
505 | goto pthreaderr; | |
506 | ||
507 | i = ipc_cond_init (&mqinfo->mqi_waitrecv, mqhdr->mqh_uname, 'R'); | |
7b487ba9 CV |
508 | if (i != 0) |
509 | goto pthreaderr; | |
510 | ||
511 | /* Initialization complete, turn off user-execute bit */ | |
512 | if (fchmod (fd, mode) == -1) | |
513 | goto err; | |
514 | close (fd); | |
515 | return ((mqd_t) mqinfo); | |
516 | } | |
517 | ||
518 | exists: | |
519 | /* Open the file then memory map */ | |
e70fdfb9 | 520 | if ((fd = open (mqname, O_RDWR | O_CLOEXEC)) < 0) |
7b487ba9 CV |
521 | { |
522 | if (errno == ENOENT && (oflag & O_CREAT)) | |
523 | goto again; | |
524 | goto err; | |
525 | } | |
526 | /* Make certain initialization is complete */ | |
527 | for (i = 0; i < MAX_TRIES; i++) | |
528 | { | |
529 | if (stat64 (mqname, &statbuff) == -1) | |
530 | { | |
531 | if (errno == ENOENT && (oflag & O_CREAT)) | |
532 | { | |
8fbd574e | 533 | close (fd); |
599d462d | 534 | fd = -1; |
7b487ba9 CV |
535 | goto again; |
536 | } | |
537 | goto err; | |
538 | } | |
539 | if ((statbuff.st_mode & S_IXUSR) == 0) | |
540 | break; | |
541 | sleep (1); | |
542 | } | |
543 | if (i == MAX_TRIES) | |
544 | { | |
545 | set_errno (ETIMEDOUT); | |
546 | goto err; | |
547 | } | |
548 | ||
549 | filesize = statbuff.st_size; | |
550 | mptr = (int8_t *) mmap64 (NULL, (size_t) filesize, PROT_READ | PROT_WRITE, | |
551 | MAP_SHARED, fd, 0); | |
552 | if (mptr == (int8_t *) MAP_FAILED) | |
553 | goto err; | |
554 | close (fd); | |
599d462d | 555 | fd = -1; |
7b487ba9 CV |
556 | |
557 | /* Allocate one mq_info{} for each open */ | |
3748b3e8 | 558 | if (!(mqinfo = (struct mq_info *) calloc (1, sizeof (struct mq_info)))) |
7b487ba9 | 559 | goto err; |
eb8a6636 | 560 | mqinfo->mqi_hdr = mqhdr = (struct mq_hdr *) mptr; |
7b487ba9 CV |
561 | mqinfo->mqi_magic = MQI_MAGIC; |
562 | mqinfo->mqi_flags = nonblock; | |
563 | ||
564 | /* Initialize mutex & condition variable */ | |
93162be5 | 565 | i = ipc_mutex_init (&mqinfo->mqi_lock, mqhdr->mqh_uname); |
7b487ba9 CV |
566 | if (i != 0) |
567 | goto pthreaderr; | |
568 | ||
3748b3e8 CV |
569 | i = ipc_cond_init (&mqinfo->mqi_waitsend, mqhdr->mqh_uname, 'S'); |
570 | if (i != 0) | |
571 | goto pthreaderr; | |
572 | ||
573 | i = ipc_cond_init (&mqinfo->mqi_waitrecv, mqhdr->mqh_uname, 'R'); | |
7b487ba9 CV |
574 | if (i != 0) |
575 | goto pthreaderr; | |
576 | ||
577 | return (mqd_t) mqinfo; | |
578 | ||
579 | pthreaderr: | |
580 | errno = i; | |
581 | err: | |
582 | /* Don't let following function calls change errno */ | |
583 | save_errno save; | |
584 | ||
585 | if (created) | |
586 | unlink (mqname); | |
587 | if (mptr != (int8_t *) MAP_FAILED) | |
588 | munmap((void *) mptr, (size_t) filesize); | |
589 | if (mqinfo) | |
3748b3e8 CV |
590 | { |
591 | if (mqinfo->mqi_lock) | |
592 | ipc_mutex_close (mqinfo->mqi_lock); | |
593 | if (mqinfo->mqi_waitsend) | |
594 | ipc_cond_close (mqinfo->mqi_waitsend); | |
595 | if (mqinfo->mqi_waitrecv) | |
596 | ipc_cond_close (mqinfo->mqi_waitrecv); | |
597 | free (mqinfo); | |
598 | } | |
599d462d CV |
599 | if (fd >= 0) |
600 | close (fd); | |
7b487ba9 CV |
601 | return (mqd_t) -1; |
602 | } | |
603 | ||
604 | extern "C" int | |
605 | mq_getattr (mqd_t mqd, struct mq_attr *mqstat) | |
606 | { | |
607 | int n; | |
608 | struct mq_hdr *mqhdr; | |
609 | struct mq_attr *attr; | |
610 | struct mq_info *mqinfo; | |
7b44665a | 611 | |
7b487ba9 CV |
612 | myfault efault; |
613 | if (efault.faulted (EBADF)) | |
614 | return -1; | |
615 | ||
616 | mqinfo = (struct mq_info *) mqd; | |
617 | if (mqinfo->mqi_magic != MQI_MAGIC) | |
618 | { | |
619 | set_errno (EBADF); | |
620 | return -1; | |
621 | } | |
622 | mqhdr = mqinfo->mqi_hdr; | |
623 | attr = &mqhdr->mqh_attr; | |
624 | if ((n = ipc_mutex_lock (mqinfo->mqi_lock)) != 0) | |
625 | { | |
626 | errno = n; | |
627 | return -1; | |
7b44665a | 628 | } |
7b487ba9 CV |
629 | mqstat->mq_flags = mqinfo->mqi_flags; /* per-open */ |
630 | mqstat->mq_maxmsg = attr->mq_maxmsg; /* remaining three per-queue */ | |
631 | mqstat->mq_msgsize = attr->mq_msgsize; | |
632 | mqstat->mq_curmsgs = attr->mq_curmsgs; | |
633 | ||
634 | ipc_mutex_unlock (mqinfo->mqi_lock); | |
635 | return 0; | |
7b44665a | 636 | } |
7b487ba9 CV |
637 | |
638 | extern "C" int | |
639 | mq_setattr (mqd_t mqd, const struct mq_attr *mqstat, struct mq_attr *omqstat) | |
640 | { | |
641 | int n; | |
7b44665a | 642 | struct mq_hdr *mqhdr; |
7b487ba9 CV |
643 | struct mq_attr *attr; |
644 | struct mq_info *mqinfo; | |
645 | ||
646 | myfault efault; | |
647 | if (efault.faulted (EBADF)) | |
648 | return -1; | |
649 | ||
650 | mqinfo = (struct mq_info *) mqd; | |
651 | if (mqinfo->mqi_magic != MQI_MAGIC) | |
652 | { | |
653 | set_errno (EBADF); | |
654 | return -1; | |
655 | } | |
656 | mqhdr = mqinfo->mqi_hdr; | |
657 | attr = &mqhdr->mqh_attr; | |
658 | if ((n = ipc_mutex_lock (mqinfo->mqi_lock)) != 0) | |
659 | { | |
660 | errno = n; | |
661 | return -1; | |
662 | } | |
663 | ||
664 | if (omqstat != NULL) | |
665 | { | |
666 | omqstat->mq_flags = mqinfo->mqi_flags; /* previous attributes */ | |
667 | omqstat->mq_maxmsg = attr->mq_maxmsg; | |
668 | omqstat->mq_msgsize = attr->mq_msgsize; | |
669 | omqstat->mq_curmsgs = attr->mq_curmsgs; /* and current status */ | |
670 | } | |
671 | ||
672 | if (mqstat->mq_flags & O_NONBLOCK) | |
673 | mqinfo->mqi_flags |= O_NONBLOCK; | |
674 | else | |
675 | mqinfo->mqi_flags &= ~O_NONBLOCK; | |
676 | ||
677 | ipc_mutex_unlock (mqinfo->mqi_lock); | |
678 | return 0; | |
679 | } | |
680 | ||
681 | extern "C" int | |
682 | mq_notify (mqd_t mqd, const struct sigevent *notification) | |
683 | { | |
684 | int n; | |
685 | pid_t pid; | |
686 | struct mq_hdr *mqhdr; | |
687 | struct mq_info *mqinfo; | |
7b44665a | 688 | |
7b487ba9 CV |
689 | myfault efault; |
690 | if (efault.faulted (EBADF)) | |
691 | return -1; | |
692 | ||
693 | mqinfo = (struct mq_info *) mqd; | |
694 | if (mqinfo->mqi_magic != MQI_MAGIC) | |
695 | { | |
7b44665a | 696 | set_errno (EBADF); |
7b487ba9 CV |
697 | return -1; |
698 | } | |
7b44665a | 699 | mqhdr = mqinfo->mqi_hdr; |
7b487ba9 CV |
700 | if ((n = ipc_mutex_lock (mqinfo->mqi_lock)) != 0) |
701 | { | |
702 | errno = n; | |
703 | return -1; | |
704 | } | |
7b44665a | 705 | |
7b487ba9 CV |
706 | pid = getpid (); |
707 | if (!notification) | |
708 | { | |
709 | if (mqhdr->mqh_pid == pid) | |
710 | mqhdr->mqh_pid = 0; /* unregister calling process */ | |
711 | } | |
712 | else | |
713 | { | |
714 | if (mqhdr->mqh_pid != 0) | |
715 | { | |
716 | if (kill (mqhdr->mqh_pid, 0) != -1 || errno != ESRCH) | |
717 | { | |
718 | set_errno (EBUSY); | |
719 | ipc_mutex_unlock (mqinfo->mqi_lock); | |
720 | return -1; | |
721 | } | |
722 | } | |
723 | mqhdr->mqh_pid = pid; | |
724 | mqhdr->mqh_event = *notification; | |
7b44665a | 725 | } |
7b487ba9 CV |
726 | ipc_mutex_unlock (mqinfo->mqi_lock); |
727 | return 0; | |
7b44665a | 728 | } |
7b487ba9 CV |
729 | |
730 | static int | |
731 | _mq_send (mqd_t mqd, const char *ptr, size_t len, unsigned int prio, | |
732 | const struct timespec *abstime) | |
733 | { | |
734 | int n; | |
735 | long index, freeindex; | |
736 | int8_t *mptr; | |
737 | struct sigevent *sigev; | |
738 | struct mq_hdr *mqhdr; | |
739 | struct mq_attr *attr; | |
740 | struct msg_hdr *msghdr, *nmsghdr, *pmsghdr; | |
741 | struct mq_info *mqinfo; | |
742 | ||
74f9ac5b CV |
743 | pthread_testcancel (); |
744 | ||
7b487ba9 CV |
745 | myfault efault; |
746 | if (efault.faulted (EBADF)) | |
747 | return -1; | |
748 | ||
749 | mqinfo = (struct mq_info *) mqd; | |
750 | if (mqinfo->mqi_magic != MQI_MAGIC) | |
751 | { | |
752 | set_errno (EBADF); | |
753 | return -1; | |
754 | } | |
755 | if (prio > MQ_PRIO_MAX) | |
756 | { | |
757 | set_errno (EINVAL); | |
758 | return -1; | |
759 | } | |
760 | ||
761 | mqhdr = mqinfo->mqi_hdr; /* struct pointer */ | |
762 | mptr = (int8_t *) mqhdr; /* byte pointer */ | |
763 | attr = &mqhdr->mqh_attr; | |
764 | if ((n = ipc_mutex_lock (mqinfo->mqi_lock)) != 0) | |
765 | { | |
766 | errno = n; | |
767 | return -1; | |
768 | } | |
769 | ||
770 | if (len > (size_t) attr->mq_msgsize) | |
771 | { | |
772 | set_errno (EMSGSIZE); | |
773 | goto err; | |
774 | } | |
775 | if (attr->mq_curmsgs == 0) | |
776 | { | |
777 | if (mqhdr->mqh_pid != 0 && mqhdr->mqh_nwait == 0) | |
778 | { | |
779 | sigev = &mqhdr->mqh_event; | |
780 | if (sigev->sigev_notify == SIGEV_SIGNAL) | |
781 | sigqueue (mqhdr->mqh_pid, sigev->sigev_signo, sigev->sigev_value); | |
782 | mqhdr->mqh_pid = 0; /* unregister */ | |
783 | } | |
784 | } | |
785 | else if (attr->mq_curmsgs >= attr->mq_maxmsg) | |
786 | { | |
787 | /* Queue is full */ | |
788 | if (mqinfo->mqi_flags & O_NONBLOCK) | |
789 | { | |
790 | set_errno (EAGAIN); | |
791 | goto err; | |
792 | } | |
793 | /* Wait for room for one message on the queue */ | |
794 | while (attr->mq_curmsgs >= attr->mq_maxmsg) | |
b994b837 CV |
795 | { |
796 | int ret = ipc_cond_timedwait (mqinfo->mqi_waitsend, mqinfo->mqi_lock, | |
797 | abstime); | |
798 | if (ret != 0) | |
799 | { | |
800 | set_errno (ret); | |
86bf572e | 801 | return -1; |
b994b837 CV |
802 | } |
803 | } | |
7b487ba9 CV |
804 | } |
805 | ||
806 | /* nmsghdr will point to new message */ | |
807 | if ((freeindex = mqhdr->mqh_free) == 0) | |
808 | api_fatal ("mq_send: curmsgs = %ld; free = 0", attr->mq_curmsgs); | |
809 | ||
810 | nmsghdr = (struct msg_hdr *) &mptr[freeindex]; | |
811 | nmsghdr->msg_prio = prio; | |
812 | nmsghdr->msg_len = len; | |
813 | memcpy (nmsghdr + 1, ptr, len); /* copy message from caller */ | |
814 | mqhdr->mqh_free = nmsghdr->msg_next; /* new freelist head */ | |
815 | ||
816 | /* Find right place for message in linked list */ | |
817 | index = mqhdr->mqh_head; | |
818 | pmsghdr = (struct msg_hdr *) &(mqhdr->mqh_head); | |
819 | while (index) | |
820 | { | |
821 | msghdr = (struct msg_hdr *) &mptr[index]; | |
822 | if (prio > msghdr->msg_prio) | |
823 | { | |
824 | nmsghdr->msg_next = index; | |
825 | pmsghdr->msg_next = freeindex; | |
826 | break; | |
827 | } | |
828 | index = msghdr->msg_next; | |
829 | pmsghdr = msghdr; | |
830 | } | |
831 | if (index == 0) | |
832 | { | |
833 | /* Queue was empty or new goes at end of list */ | |
834 | pmsghdr->msg_next = freeindex; | |
835 | nmsghdr->msg_next = 0; | |
836 | } | |
837 | /* Wake up anyone blocked in mq_receive waiting for a message */ | |
838 | if (attr->mq_curmsgs == 0) | |
3748b3e8 | 839 | ipc_cond_signal (mqinfo->mqi_waitrecv); |
7b487ba9 CV |
840 | attr->mq_curmsgs++; |
841 | ||
842 | ipc_mutex_unlock (mqinfo->mqi_lock); | |
843 | return 0; | |
844 | ||
845 | err: | |
846 | ipc_mutex_unlock (mqinfo->mqi_lock); | |
847 | return -1; | |
848 | } | |
849 | ||
850 | extern "C" int | |
851 | mq_send (mqd_t mqd, const char *ptr, size_t len, unsigned int prio) | |
852 | { | |
853 | return _mq_send (mqd, ptr, len, prio, NULL); | |
854 | } | |
855 | ||
856 | extern "C" int | |
857 | mq_timedsend (mqd_t mqd, const char *ptr, size_t len, unsigned int prio, | |
858 | const struct timespec *abstime) | |
859 | { | |
860 | return _mq_send (mqd, ptr, len, prio, abstime); | |
861 | } | |
862 | ||
863 | static ssize_t | |
864 | _mq_receive (mqd_t mqd, char *ptr, size_t maxlen, unsigned int *priop, | |
865 | const struct timespec *abstime) | |
866 | { | |
867 | int n; | |
868 | long index; | |
869 | int8_t *mptr; | |
870 | ssize_t len; | |
7b44665a | 871 | struct mq_hdr *mqhdr; |
7b487ba9 CV |
872 | struct mq_attr *attr; |
873 | struct msg_hdr *msghdr; | |
874 | struct mq_info *mqinfo; | |
875 | ||
74f9ac5b CV |
876 | pthread_testcancel (); |
877 | ||
7b487ba9 CV |
878 | myfault efault; |
879 | if (efault.faulted (EBADF)) | |
880 | return -1; | |
881 | ||
882 | mqinfo = (struct mq_info *) mqd; | |
883 | if (mqinfo->mqi_magic != MQI_MAGIC) | |
884 | { | |
885 | set_errno (EBADF); | |
886 | return -1; | |
887 | } | |
888 | mqhdr = mqinfo->mqi_hdr; /* struct pointer */ | |
889 | mptr = (int8_t *) mqhdr; /* byte pointer */ | |
890 | attr = &mqhdr->mqh_attr; | |
891 | if ((n = ipc_mutex_lock (mqinfo->mqi_lock)) != 0) | |
892 | { | |
893 | errno = n; | |
894 | return -1; | |
895 | } | |
896 | ||
897 | if (maxlen < (size_t) attr->mq_msgsize) | |
898 | { | |
899 | set_errno (EMSGSIZE); | |
900 | goto err; | |
901 | } | |
902 | if (attr->mq_curmsgs == 0) /* queue is empty */ | |
903 | { | |
904 | if (mqinfo->mqi_flags & O_NONBLOCK) | |
905 | { | |
906 | set_errno (EAGAIN); | |
907 | goto err; | |
908 | } | |
909 | /* Wait for a message to be placed onto queue */ | |
910 | mqhdr->mqh_nwait++; | |
911 | while (attr->mq_curmsgs == 0) | |
b994b837 CV |
912 | { |
913 | int ret = ipc_cond_timedwait (mqinfo->mqi_waitrecv, mqinfo->mqi_lock, | |
914 | abstime); | |
915 | if (ret != 0) | |
916 | { | |
917 | set_errno (ret); | |
86bf572e | 918 | return -1; |
b994b837 CV |
919 | } |
920 | } | |
7b487ba9 CV |
921 | mqhdr->mqh_nwait--; |
922 | } | |
923 | ||
924 | if ((index = mqhdr->mqh_head) == 0) | |
925 | api_fatal ("mq_receive: curmsgs = %ld; head = 0", attr->mq_curmsgs); | |
926 | ||
927 | msghdr = (struct msg_hdr *) &mptr[index]; | |
928 | mqhdr->mqh_head = msghdr->msg_next; /* new head of list */ | |
929 | len = msghdr->msg_len; | |
930 | memcpy(ptr, msghdr + 1, len); /* copy the message itself */ | |
931 | if (priop != NULL) | |
932 | *priop = msghdr->msg_prio; | |
933 | ||
934 | /* Just-read message goes to front of free list */ | |
935 | msghdr->msg_next = mqhdr->mqh_free; | |
936 | mqhdr->mqh_free = index; | |
937 | ||
938 | /* Wake up anyone blocked in mq_send waiting for room */ | |
939 | if (attr->mq_curmsgs == attr->mq_maxmsg) | |
3748b3e8 | 940 | ipc_cond_signal (mqinfo->mqi_waitsend); |
7b487ba9 CV |
941 | attr->mq_curmsgs--; |
942 | ||
943 | ipc_mutex_unlock (mqinfo->mqi_lock); | |
944 | return len; | |
945 | ||
946 | err: | |
947 | ipc_mutex_unlock (mqinfo->mqi_lock); | |
948 | return -1; | |
949 | } | |
950 | ||
951 | extern "C" ssize_t | |
952 | mq_receive (mqd_t mqd, char *ptr, size_t maxlen, unsigned int *priop) | |
953 | { | |
954 | return _mq_receive (mqd, ptr, maxlen, priop, NULL); | |
955 | } | |
956 | ||
957 | extern "C" ssize_t | |
958 | mq_timedreceive (mqd_t mqd, char *ptr, size_t maxlen, unsigned int *priop, | |
959 | const struct timespec *abstime) | |
960 | { | |
961 | return _mq_receive (mqd, ptr, maxlen, priop, abstime); | |
962 | } | |
963 | ||
964 | extern "C" int | |
965 | mq_close (mqd_t mqd) | |
966 | { | |
967 | long msgsize, filesize; | |
968 | struct mq_hdr *mqhdr; | |
969 | struct mq_attr *attr; | |
970 | struct mq_info *mqinfo; | |
971 | ||
972 | myfault efault; | |
973 | if (efault.faulted (EBADF)) | |
974 | return -1; | |
975 | ||
976 | mqinfo = (struct mq_info *) mqd; | |
977 | if (mqinfo->mqi_magic != MQI_MAGIC) | |
978 | { | |
979 | set_errno (EBADF); | |
980 | return -1; | |
981 | } | |
982 | mqhdr = mqinfo->mqi_hdr; | |
983 | attr = &mqhdr->mqh_attr; | |
984 | ||
985 | if (mq_notify (mqd, NULL)) /* unregister calling process */ | |
986 | return -1; | |
987 | ||
988 | msgsize = MSGSIZE (attr->mq_msgsize); | |
989 | filesize = sizeof (struct mq_hdr) | |
990 | + (attr->mq_maxmsg * (sizeof (struct msg_hdr) + msgsize)); | |
991 | if (munmap (mqinfo->mqi_hdr, filesize) == -1) | |
992 | return -1; | |
993 | ||
994 | mqinfo->mqi_magic = 0; /* just in case */ | |
3748b3e8 CV |
995 | ipc_cond_close (mqinfo->mqi_waitsend); |
996 | ipc_cond_close (mqinfo->mqi_waitrecv); | |
7b487ba9 CV |
997 | ipc_mutex_close (mqinfo->mqi_lock); |
998 | free (mqinfo); | |
999 | return 0; | |
1000 | } | |
1001 | ||
1002 | extern "C" int | |
1003 | mq_unlink (const char *name) | |
1004 | { | |
547ad329 CV |
1005 | size_t len = strlen (name); |
1006 | char mqname[ipc_names[mqueue].prefix_len + len]; | |
7b487ba9 | 1007 | |
547ad329 | 1008 | if (!check_path (mqname, mqueue, name, len)) |
7b487ba9 CV |
1009 | return -1; |
1010 | if (unlink (mqname) == -1) | |
1011 | return -1; | |
1012 | return 0; | |
1013 | } | |
1014 | ||
8fbd574e CV |
1015 | /* POSIX named semaphore implementation. Loosely based on Richard W. STEPHENS |
1016 | implementation as far as sem_open is concerned, but under the hood using | |
1017 | the already existing semaphore class in thread.cc. Using a file backed | |
1018 | solution allows to implement kernel persistent named semaphores. */ | |
1019 | ||
1020 | struct sem_finfo | |
1021 | { | |
1022 | unsigned int value; | |
1023 | unsigned long long hash; | |
1024 | LUID luid; | |
1025 | }; | |
1026 | ||
1027 | extern "C" sem_t * | |
1028 | sem_open (const char *name, int oflag, ...) | |
1029 | { | |
599d462d | 1030 | int i, fd = -1, created; |
8fbd574e CV |
1031 | va_list ap; |
1032 | mode_t mode = 0; | |
1033 | unsigned int value = 0; | |
1034 | struct __stat64 statbuff; | |
1035 | sem_t *sem = SEM_FAILED; | |
1036 | sem_finfo sf; | |
8fbd574e CV |
1037 | bool wasopen = false; |
1038 | ipc_flock file; | |
1039 | ||
547ad329 CV |
1040 | size_t len = strlen (name); |
1041 | char semname[ipc_names[semaphore].prefix_len + len]; | |
1042 | ||
1043 | if (!check_path (semname, semaphore, name, len)) | |
8fbd574e CV |
1044 | return SEM_FAILED; |
1045 | ||
1046 | myfault efault; | |
1047 | if (efault.faulted (EFAULT)) | |
1048 | return SEM_FAILED; | |
1049 | ||
1050 | created = 0; | |
1051 | oflag &= (O_CREAT | O_EXCL); | |
1052 | ||
1053 | again: | |
1054 | if (oflag & O_CREAT) | |
1055 | { | |
1056 | va_start (ap, oflag); /* init ap to final named argument */ | |
1057 | mode = va_arg (ap, mode_t) & ~S_IXUSR; | |
1058 | value = va_arg (ap, unsigned int); | |
1059 | va_end (ap); | |
1060 | ||
1061 | /* Open and specify O_EXCL and user-execute */ | |
e70fdfb9 | 1062 | fd = open (semname, oflag | O_EXCL | O_RDWR | O_CLOEXEC, mode | S_IXUSR); |
8fbd574e | 1063 | if (fd < 0) |
7b44665a | 1064 | { |
8fbd574e CV |
1065 | if (errno == EEXIST && (oflag & O_EXCL) == 0) |
1066 | goto exists; /* already exists, OK */ | |
1067 | return SEM_FAILED; | |
1068 | } | |
1069 | created = 1; | |
1070 | /* First one to create the file initializes it. */ | |
41e9c145 | 1071 | NtAllocateLocallyUniqueId (&sf.luid); |
8fbd574e CV |
1072 | sf.value = value; |
1073 | sf.hash = hash_path_name (0, semname); | |
1074 | if (write (fd, &sf, sizeof sf) != sizeof sf) | |
7b44665a | 1075 | goto err; |
8fbd574e CV |
1076 | sem = semaphore::open (sf.hash, sf.luid, fd, oflag, mode, value, wasopen); |
1077 | if (sem == SEM_FAILED) | |
7b44665a | 1078 | goto err; |
8fbd574e CV |
1079 | /* Initialization complete, turn off user-execute bit */ |
1080 | if (fchmod (fd, mode) == -1) | |
1081 | goto err; | |
1082 | /* Don't close (fd); */ | |
1083 | return sem; | |
1084 | } | |
1085 | ||
1086 | exists: | |
1087 | /* Open the file and fetch the semaphore name. */ | |
e70fdfb9 | 1088 | if ((fd = open (semname, O_RDWR | O_CLOEXEC)) < 0) |
8fbd574e CV |
1089 | { |
1090 | if (errno == ENOENT && (oflag & O_CREAT)) | |
1091 | goto again; | |
1092 | goto err; | |
1093 | } | |
1094 | /* Make certain initialization is complete */ | |
1095 | for (i = 0; i < MAX_TRIES; i++) | |
1096 | { | |
1097 | if (stat64 (semname, &statbuff) == -1) | |
1098 | { | |
1099 | if (errno == ENOENT && (oflag & O_CREAT)) | |
1100 | { | |
1101 | close (fd); | |
599d462d | 1102 | fd = -1; |
8fbd574e CV |
1103 | goto again; |
1104 | } | |
1105 | goto err; | |
1106 | } | |
1107 | if ((statbuff.st_mode & S_IXUSR) == 0) | |
1108 | break; | |
1109 | sleep (1); | |
1110 | } | |
1111 | if (i == MAX_TRIES) | |
1112 | { | |
1113 | set_errno (ETIMEDOUT); | |
1114 | goto err; | |
1115 | } | |
1116 | if (file.lock (fd, sizeof sf)) | |
1117 | goto err; | |
1118 | if (read (fd, &sf, sizeof sf) != sizeof sf) | |
1119 | goto err; | |
1120 | sem = semaphore::open (sf.hash, sf.luid, fd, oflag, mode, sf.value, wasopen); | |
1121 | file.unlock (fd); | |
1122 | if (sem == SEM_FAILED) | |
1123 | goto err; | |
1124 | /* If wasopen is set, the semaphore was already opened and we already have | |
1125 | an open file descriptor pointing to the file. This means, we have to | |
1126 | close the file descriptor created in this call. It won't be stored | |
1127 | anywhere anyway. */ | |
1128 | if (wasopen) | |
1129 | close (fd); | |
1130 | return sem; | |
1131 | ||
1132 | err: | |
1133 | /* Don't let following function calls change errno */ | |
1134 | save_errno save; | |
1135 | ||
1136 | file.unlock (fd); | |
1137 | if (created) | |
1138 | unlink (semname); | |
1139 | if (sem != SEM_FAILED) | |
1140 | semaphore::close (sem); | |
599d462d CV |
1141 | if (fd >= 0) |
1142 | close (fd); | |
8fbd574e CV |
1143 | return SEM_FAILED; |
1144 | } | |
1145 | ||
1146 | int | |
1147 | _sem_close (sem_t *sem, bool do_close) | |
1148 | { | |
1149 | sem_finfo sf; | |
1150 | int fd, ret = -1; | |
1151 | ipc_flock file; | |
1152 | ||
1153 | if (semaphore::getinternal (sem, &fd, &sf.hash, &sf.luid, &sf.value) == -1) | |
1154 | return -1; | |
1155 | if (!file.lock (fd, sizeof sf) | |
1156 | && lseek64 (fd, 0LL, SEEK_SET) != (_off64_t) -1 | |
1157 | && write (fd, &sf, sizeof sf) == sizeof sf) | |
1158 | ret = do_close ? semaphore::close (sem) : 0; | |
1159 | ||
1160 | /* Don't let following function calls change errno */ | |
1161 | save_errno save; | |
1162 | file.unlock (fd); | |
1163 | close (fd); | |
1164 | ||
1165 | return ret; | |
1166 | } | |
1167 | ||
1168 | extern "C" int | |
1169 | sem_close (sem_t *sem) | |
1170 | { | |
1171 | return _sem_close (sem, true); | |
1172 | } | |
1173 | ||
1174 | extern "C" int | |
1175 | sem_unlink (const char *name) | |
1176 | { | |
547ad329 CV |
1177 | size_t len = strlen (name); |
1178 | char semname[ipc_names[semaphore].prefix_len + len]; | |
8fbd574e | 1179 | |
547ad329 | 1180 | if (!check_path (semname, semaphore, name, len)) |
8fbd574e CV |
1181 | return -1; |
1182 | if (unlink (semname) == -1) | |
1183 | return -1; | |
1184 | return 0; | |
1185 | } |