2 * handles.c: Generic and internal operations on handles
5 * Dick Porter (dick@ximian.com)
7 * (C) 2002-2006 Novell, Inc.
16 #include <sys/types.h>
17 #ifdef HAVE_SYS_SOCKET_H
18 # include <sys/socket.h>
23 #ifdef HAVE_SYS_MMAN_H
24 # include <sys/mman.h>
31 #include <mono/utils/gc_wrapper.h>
33 #include <mono/io-layer/wapi.h>
34 #include <mono/io-layer/wapi-private.h>
35 #include <mono/io-layer/handles-private.h>
36 #include <mono/io-layer/mono-mutex.h>
37 #include <mono/io-layer/misc-private.h>
38 #include <mono/io-layer/shared.h>
39 #include <mono/io-layer/collection.h>
40 #include <mono/io-layer/process-private.h>
41 #include <mono/io-layer/critical-section-private.h>
46 static void (*_wapi_handle_ops_get_close_func (WapiHandleType type))(gpointer, gpointer);
48 static WapiHandleCapability handle_caps[WAPI_HANDLE_COUNT]={0};
49 static struct _WapiHandleOps *handle_ops[WAPI_HANDLE_COUNT]={
57 #ifndef DISABLE_SOCKETS
63 &_wapi_namedmutex_ops,
65 &_wapi_namedevent_ops,
68 static void _wapi_shared_details (gpointer handle_info);
70 static void (*handle_details[WAPI_HANDLE_COUNT])(gpointer) = {
73 _wapi_console_details,
74 _wapi_shared_details, /* thread */
78 NULL, /* Nothing useful to see in a socket handle */
79 NULL, /* Nothing useful to see in a find handle */
80 _wapi_shared_details, /* process */
82 _wapi_shared_details, /* namedmutex */
83 _wapi_shared_details, /* namedsem */
84 _wapi_shared_details, /* namedevent */
87 const char *_wapi_handle_typename[] = {
106 * We can hold _WAPI_PRIVATE_MAX_SLOTS * _WAPI_HANDLE_INITIAL_COUNT handles.
107 * If 4M handles are not enough... Oh, well... we will crash.
109 #define SLOT_INDEX(x) (x / _WAPI_HANDLE_INITIAL_COUNT)
110 #define SLOT_OFFSET(x) (x % _WAPI_HANDLE_INITIAL_COUNT)
112 struct _WapiHandleUnshared *_wapi_private_handles [_WAPI_PRIVATE_MAX_SLOTS];
113 static guint32 _wapi_private_handle_count = 0;
114 static guint32 _wapi_private_handle_slot_count = 0;
116 struct _WapiHandleSharedLayout *_wapi_shared_layout = NULL;
117 struct _WapiFileShareLayout *_wapi_fileshare_layout = NULL;
119 guint32 _wapi_fd_reserve;
122 * This is an internal handle which is used for handling waiting for multiple handles.
123 * Threads which wait for multiple handles wait on this one handle, and when a handle
124 * is signalled, this handle is signalled too.
126 static gpointer _wapi_global_signal_handle;
128 /* Point to the mutex/cond inside _wapi_global_signal_handle */
129 mono_mutex_t *_wapi_global_signal_mutex;
130 pthread_cond_t *_wapi_global_signal_cond;
133 gboolean _wapi_has_shut_down = FALSE;
135 /* Use this instead of getpid(), to cope with linuxthreads. It's a
136 * function rather than a variable lookup because we need to get at
137 * this before share_init() might have been called.
139 static pid_t _wapi_pid;
140 static mono_once_t pid_init_once = MONO_ONCE_INIT;
142 static gpointer _wapi_handle_real_new (WapiHandleType type, gpointer handle_specific);
144 static void pid_init (void)
146 _wapi_pid = getpid ();
149 pid_t _wapi_getpid (void)
151 mono_once (&pid_init_once, pid_init);
157 static mono_mutex_t scan_mutex = MONO_MUTEX_INITIALIZER;
159 static void handle_cleanup (void)
163 _wapi_process_signal_self ();
165 /* Every shared handle we were using ought really to be closed
166 * by now, but to make sure just blow them all away. The
167 * exiting finalizer thread in particular races us to the
168 * program exit and doesn't always win, so it can be left
169 * cluttering up the shared file. Anything else left over is
172 for(i = SLOT_INDEX (0); _wapi_private_handles[i] != NULL; i++) {
173 for(j = SLOT_OFFSET (0); j < _WAPI_HANDLE_INITIAL_COUNT; j++) {
174 struct _WapiHandleUnshared *handle_data = &_wapi_private_handles[i][j];
175 int type = handle_data->type;
178 if (_WAPI_SHARED_HANDLE (type)) {
179 gpointer handle = GINT_TO_POINTER (i*_WAPI_HANDLE_INITIAL_COUNT+j);
181 if (type == WAPI_HANDLE_THREAD) {
182 /* Special-case thread handles
183 * because they need extra
184 * cleanup. This also avoids
185 * a race condition between
186 * the application exit and
187 * the finalizer thread - if
188 * it finishes up between now
189 * and actual app termination
190 * it will find all its handle
191 * details have been blown
192 * away, so this sets those
195 _wapi_thread_set_termination_details (handle, 0);
198 for(k = handle_data->ref; k > 0; k--) {
200 g_message ("%s: unreffing %s handle %p", __func__, _wapi_handle_typename[type], handle);
203 _wapi_handle_unref (handle);
209 _wapi_shm_semaphores_remove ();
212 void _wapi_cleanup ()
214 g_assert (_wapi_has_shut_down == FALSE);
216 _wapi_has_shut_down = TRUE;
218 _wapi_critical_section_cleanup ();
219 _wapi_error_cleanup ();
220 _wapi_thread_cleanup ();
223 static mono_once_t shared_init_once = MONO_ONCE_INIT;
224 static void shared_init (void)
226 g_assert ((sizeof (handle_ops) / sizeof (handle_ops[0]))
227 == WAPI_HANDLE_COUNT);
229 _wapi_fd_reserve = getdtablesize();
231 /* This is needed by the code in _wapi_handle_new_internal */
232 _wapi_fd_reserve = (_wapi_fd_reserve + (_WAPI_HANDLE_INITIAL_COUNT - 1)) & ~(_WAPI_HANDLE_INITIAL_COUNT - 1);
236 * The entries in _wapi_private_handles reserved for fds are allocated lazily to
240 _wapi_private_handles [idx++] = g_new0 (struct _WapiHandleUnshared,
241 _WAPI_HANDLE_INITIAL_COUNT);
244 _wapi_private_handle_count += _WAPI_HANDLE_INITIAL_COUNT;
245 _wapi_private_handle_slot_count ++;
246 } while(_wapi_fd_reserve > _wapi_private_handle_count);
248 _wapi_shm_semaphores_init ();
250 _wapi_shared_layout = _wapi_shm_attach (WAPI_SHM_DATA);
251 g_assert (_wapi_shared_layout != NULL);
253 _wapi_fileshare_layout = _wapi_shm_attach (WAPI_SHM_FILESHARE);
254 g_assert (_wapi_fileshare_layout != NULL);
256 #if !defined (DISABLE_SHARED_HANDLES)
257 if (!g_getenv ("MONO_DISABLE_SHM"))
258 _wapi_collection_init ();
261 /* Can't call wapi_handle_new as it calls us recursively */
262 _wapi_global_signal_handle = _wapi_handle_real_new (WAPI_HANDLE_EVENT, NULL);
264 _wapi_global_signal_cond = &_WAPI_PRIVATE_HANDLES (GPOINTER_TO_UINT (_wapi_global_signal_handle)).signal_cond;
265 _wapi_global_signal_mutex = &_WAPI_PRIVATE_HANDLES (GPOINTER_TO_UINT (_wapi_global_signal_handle)).signal_mutex;
267 /* Using g_atexit here instead of an explicit function call in
268 * a cleanup routine lets us cope when a third-party library
269 * calls exit (eg if an X client loses the connection to its
272 g_atexit (handle_cleanup);
275 static void _wapi_handle_init_shared (struct _WapiHandleShared *handle,
277 gpointer handle_specific)
279 g_assert (_wapi_has_shut_down == FALSE);
282 handle->timestamp = (guint32)(time (NULL) & 0xFFFFFFFF);
283 handle->signalled = FALSE;
284 handle->handle_refs = 1;
286 if (handle_specific != NULL) {
287 memcpy (&handle->u, handle_specific, sizeof (handle->u));
291 static void _wapi_handle_init (struct _WapiHandleUnshared *handle,
292 WapiHandleType type, gpointer handle_specific)
296 g_assert (_wapi_has_shut_down == FALSE);
299 handle->signalled = FALSE;
302 if (!_WAPI_SHARED_HANDLE(type)) {
303 thr_ret = pthread_cond_init (&handle->signal_cond, NULL);
304 g_assert (thr_ret == 0);
306 thr_ret = mono_mutex_init (&handle->signal_mutex, NULL);
307 g_assert (thr_ret == 0);
309 if (handle_specific != NULL) {
310 memcpy (&handle->u, handle_specific,
316 static guint32 _wapi_handle_new_shared (WapiHandleType type,
317 gpointer handle_specific)
320 static guint32 last = 1;
323 g_assert (_wapi_has_shut_down == FALSE);
325 /* Leave the first slot empty as a guard */
327 /* FIXME: expandable array */
328 for(offset = last; offset <_WAPI_HANDLE_INITIAL_COUNT; offset++) {
329 struct _WapiHandleShared *handle = &_wapi_shared_layout->handles[offset];
331 if(handle->type == WAPI_HANDLE_UNUSED) {
332 thr_ret = _wapi_handle_lock_shared_handles ();
333 g_assert (thr_ret == 0);
335 if (InterlockedCompareExchange ((gint32 *)&handle->type, type, WAPI_HANDLE_UNUSED) == WAPI_HANDLE_UNUSED) {
338 _wapi_handle_init_shared (handle, type,
341 _wapi_handle_unlock_shared_handles ();
345 /* Someone else beat us to it, just
350 _wapi_handle_unlock_shared_handles ();
355 /* Try again from the beginning */
360 /* Will need to expand the array. The caller will sort it out */
366 * _wapi_handle_new_internal:
367 * @type: Init handle to this type
369 * Search for a free handle and initialize it. Return the handle on
370 * success and 0 on failure. This is only called from
371 * _wapi_handle_new, and scan_mutex must be held.
373 static guint32 _wapi_handle_new_internal (WapiHandleType type,
374 gpointer handle_specific)
377 static guint32 last = 0;
378 gboolean retry = FALSE;
380 g_assert (_wapi_has_shut_down == FALSE);
382 /* A linear scan should be fast enough. Start from the last
383 * allocation, assuming that handles are allocated more often
384 * than they're freed. Leave the space reserved for file
388 if (last < _wapi_fd_reserve) {
389 last = _wapi_fd_reserve;
396 for(i = SLOT_INDEX (count); i < _wapi_private_handle_slot_count; i++) {
397 if (_wapi_private_handles [i]) {
398 for (k = SLOT_OFFSET (count); k < _WAPI_HANDLE_INITIAL_COUNT; k++) {
399 struct _WapiHandleUnshared *handle = &_wapi_private_handles [i][k];
401 if(handle->type == WAPI_HANDLE_UNUSED) {
404 _wapi_handle_init (handle, type, handle_specific);
412 if(retry && last > _wapi_fd_reserve) {
413 /* Try again from the beginning */
414 last = _wapi_fd_reserve;
418 /* Will need to expand the array. The caller will sort it out */
423 static gpointer _wapi_handle_real_new (WapiHandleType type, gpointer handle_specific)
425 guint32 handle_idx = 0;
430 g_message ("%s: Creating new handle of type %s", __func__,
431 _wapi_handle_typename[type]);
434 g_assert(!_WAPI_FD_HANDLE(type));
436 pthread_cleanup_push ((void(*)(void *))mono_mutex_unlock_in_cleanup,
437 (void *)&scan_mutex);
438 thr_ret = mono_mutex_lock (&scan_mutex);
439 g_assert (thr_ret == 0);
441 while ((handle_idx = _wapi_handle_new_internal (type, handle_specific)) == 0) {
442 /* Try and expand the array, and have another go */
443 int idx = SLOT_INDEX (_wapi_private_handle_count);
444 if (idx >= _WAPI_PRIVATE_MAX_SLOTS) {
448 _wapi_private_handles [idx] = g_new0 (struct _WapiHandleUnshared,
449 _WAPI_HANDLE_INITIAL_COUNT);
451 _wapi_private_handle_count += _WAPI_HANDLE_INITIAL_COUNT;
452 _wapi_private_handle_slot_count ++;
455 thr_ret = mono_mutex_unlock (&scan_mutex);
456 g_assert (thr_ret == 0);
457 pthread_cleanup_pop (0);
459 if (handle_idx == 0) {
460 /* We ran out of slots */
461 handle = _WAPI_HANDLE_INVALID;
465 /* Make sure we left the space for fd mappings */
466 g_assert (handle_idx >= _wapi_fd_reserve);
468 handle = GUINT_TO_POINTER (handle_idx);
471 g_message ("%s: Allocated new handle %p", __func__, handle);
474 if (_WAPI_SHARED_HANDLE(type)) {
475 /* Add the shared section too */
478 ref = _wapi_handle_new_shared (type, handle_specific);
480 _wapi_handle_collect ();
481 _wapi_process_reap ();
482 ref = _wapi_handle_new_shared (type, handle_specific);
484 /* FIXME: grow the arrays */
485 handle = _WAPI_HANDLE_INVALID;
490 _WAPI_PRIVATE_HANDLES(handle_idx).u.shared.offset = ref;
492 g_message ("%s: New shared handle at offset 0x%x", __func__,
501 gpointer _wapi_handle_new (WapiHandleType type, gpointer handle_specific)
503 g_assert (_wapi_has_shut_down == FALSE);
505 mono_once (&shared_init_once, shared_init);
507 return _wapi_handle_real_new (type, handle_specific);
510 gpointer _wapi_handle_new_from_offset (WapiHandleType type, guint32 offset,
513 guint32 handle_idx = 0;
514 gpointer handle = INVALID_HANDLE_VALUE;
516 struct _WapiHandleShared *shared;
517 guint32 now = (guint32)(time (NULL) & 0xFFFFFFFF);
519 g_assert (_wapi_has_shut_down == FALSE);
521 mono_once (&shared_init_once, shared_init);
524 g_message ("%s: Creating new handle of type %s to offset %d", __func__,
525 _wapi_handle_typename[type], offset);
528 g_assert(!_WAPI_FD_HANDLE(type));
529 g_assert(_WAPI_SHARED_HANDLE(type));
530 g_assert(offset != 0);
532 shared = &_wapi_shared_layout->handles[offset];
534 /* Bump up the timestamp for this offset */
535 InterlockedExchange ((gint32 *)&shared->timestamp, now);
538 pthread_cleanup_push ((void(*)(void *))mono_mutex_unlock_in_cleanup,
539 (void *)&scan_mutex);
540 thr_ret = mono_mutex_lock (&scan_mutex);
541 g_assert (thr_ret == 0);
543 for (i = SLOT_INDEX (0); i < _wapi_private_handle_slot_count; i++) {
544 if (_wapi_private_handles [i]) {
545 for (k = SLOT_OFFSET (0); k < _WAPI_HANDLE_INITIAL_COUNT; k++) {
546 struct _WapiHandleUnshared *handle_data = &_wapi_private_handles [i][k];
548 if (handle_data->type == type &&
549 handle_data->u.shared.offset == offset) {
550 handle = GUINT_TO_POINTER (i * _WAPI_HANDLE_INITIAL_COUNT + k);
551 goto first_pass_done;
558 thr_ret = mono_mutex_unlock (&scan_mutex);
559 g_assert (thr_ret == 0);
560 pthread_cleanup_pop (0);
562 if (handle != INVALID_HANDLE_VALUE) {
563 _wapi_handle_ref (handle);
566 g_message ("%s: Returning old handle %p referencing 0x%x",
567 __func__, handle, offset);
572 /* Prevent entries expiring under us as we search */
573 thr_ret = _wapi_handle_lock_shared_handles ();
574 g_assert (thr_ret == 0);
576 if (shared->type == WAPI_HANDLE_UNUSED) {
577 /* Someone deleted this handle while we were working */
579 g_message ("%s: Handle at 0x%x unused", __func__, offset);
584 if (shared->type != type) {
586 g_message ("%s: Wrong type at %d 0x%x! Found %s wanted %s",
587 __func__, offset, offset,
588 _wapi_handle_typename[shared->type],
589 _wapi_handle_typename[type]);
594 pthread_cleanup_push ((void(*)(void *))mono_mutex_unlock_in_cleanup,
595 (void *)&scan_mutex);
596 thr_ret = mono_mutex_lock (&scan_mutex);
597 g_assert (thr_ret == 0);
599 while ((handle_idx = _wapi_handle_new_internal (type, NULL)) == 0) {
600 /* Try and expand the array, and have another go */
601 int idx = SLOT_INDEX (_wapi_private_handle_count);
602 _wapi_private_handles [idx] = g_new0 (struct _WapiHandleUnshared,
603 _WAPI_HANDLE_INITIAL_COUNT);
605 _wapi_private_handle_count += _WAPI_HANDLE_INITIAL_COUNT;
606 _wapi_private_handle_slot_count ++;
609 thr_ret = mono_mutex_unlock (&scan_mutex);
610 g_assert (thr_ret == 0);
611 pthread_cleanup_pop (0);
613 /* Make sure we left the space for fd mappings */
614 g_assert (handle_idx >= _wapi_fd_reserve);
616 handle = GUINT_TO_POINTER (handle_idx);
618 _WAPI_PRIVATE_HANDLES(handle_idx).u.shared.offset = offset;
619 InterlockedIncrement ((gint32 *)&shared->handle_refs);
622 g_message ("%s: Allocated new handle %p referencing 0x%x (shared refs %d)", __func__, handle, offset, shared->handle_refs);
626 _wapi_handle_unlock_shared_handles ();
632 init_handles_slot (int idx)
636 pthread_cleanup_push ((void(*)(void *))mono_mutex_unlock_in_cleanup,
637 (void *)&scan_mutex);
638 thr_ret = mono_mutex_lock (&scan_mutex);
639 g_assert (thr_ret == 0);
641 if (_wapi_private_handles [idx] == NULL) {
642 _wapi_private_handles [idx] = g_new0 (struct _WapiHandleUnshared,
643 _WAPI_HANDLE_INITIAL_COUNT);
644 g_assert (_wapi_private_handles [idx]);
647 thr_ret = mono_mutex_unlock (&scan_mutex);
648 g_assert (thr_ret == 0);
649 pthread_cleanup_pop (0);
652 gpointer _wapi_handle_new_fd (WapiHandleType type, int fd,
653 gpointer handle_specific)
655 struct _WapiHandleUnshared *handle;
658 g_assert (_wapi_has_shut_down == FALSE);
660 mono_once (&shared_init_once, shared_init);
663 g_message ("%s: Creating new handle of type %s", __func__,
664 _wapi_handle_typename[type]);
667 g_assert(_WAPI_FD_HANDLE(type));
668 g_assert(!_WAPI_SHARED_HANDLE(type));
670 if (fd >= _wapi_fd_reserve) {
672 g_message ("%s: fd %d is too big", __func__, fd);
675 return(GUINT_TO_POINTER (_WAPI_HANDLE_INVALID));
678 /* Initialize the array entries on demand */
679 if (_wapi_private_handles [SLOT_INDEX (fd)] == NULL)
680 init_handles_slot (SLOT_INDEX (fd));
682 handle = &_WAPI_PRIVATE_HANDLES(fd);
684 if (handle->type != WAPI_HANDLE_UNUSED) {
686 g_message ("%s: fd %d is already in use!", __func__, fd);
688 /* FIXME: clean up this handle? We can't do anything
689 * with the fd, cos thats the new one
694 g_message ("%s: Assigning new fd handle %d", __func__, fd);
697 /* Prevent file share entries racing with us, when the file
698 * handle is only half initialised
700 thr_ret = _wapi_shm_sem_lock (_WAPI_SHARED_SEM_FILESHARE);
701 g_assert(thr_ret == 0);
703 _wapi_handle_init (handle, type, handle_specific);
705 thr_ret = _wapi_shm_sem_unlock (_WAPI_SHARED_SEM_FILESHARE);
707 return(GUINT_TO_POINTER(fd));
710 gboolean _wapi_lookup_handle (gpointer handle, WapiHandleType type,
711 gpointer *handle_specific)
713 struct _WapiHandleUnshared *handle_data;
714 guint32 handle_idx = GPOINTER_TO_UINT(handle);
716 if (!_WAPI_PRIVATE_VALID_SLOT (handle_idx)) {
720 /* Initialize the array entries on demand */
721 if (_wapi_private_handles [SLOT_INDEX (handle_idx)] == NULL)
722 init_handles_slot (SLOT_INDEX (handle_idx));
724 handle_data = &_WAPI_PRIVATE_HANDLES(handle_idx);
726 if (handle_data->type != type) {
730 if (handle_specific == NULL) {
734 if (_WAPI_SHARED_HANDLE(type)) {
735 struct _WapiHandle_shared_ref *ref;
736 struct _WapiHandleShared *shared_handle_data;
738 ref = &handle_data->u.shared;
739 shared_handle_data = &_wapi_shared_layout->handles[ref->offset];
741 if (shared_handle_data->type != type) {
742 /* The handle must have been deleted on us
747 *handle_specific = &shared_handle_data->u;
749 *handle_specific = &handle_data->u;
756 _wapi_handle_foreach (WapiHandleType type,
757 gboolean (*on_each)(gpointer test, gpointer user),
760 struct _WapiHandleUnshared *handle_data = NULL;
765 pthread_cleanup_push ((void(*)(void *))mono_mutex_unlock_in_cleanup,
766 (void *)&scan_mutex);
767 thr_ret = mono_mutex_lock (&scan_mutex);
768 g_assert (thr_ret == 0);
770 for (i = SLOT_INDEX (0); i < _wapi_private_handle_slot_count; i++) {
771 if (_wapi_private_handles [i]) {
772 for (k = SLOT_OFFSET (0); k < _WAPI_HANDLE_INITIAL_COUNT; k++) {
773 handle_data = &_wapi_private_handles [i][k];
775 if (handle_data->type == type) {
776 ret = GUINT_TO_POINTER (i * _WAPI_HANDLE_INITIAL_COUNT + k);
777 if (on_each (ret, user_data) == TRUE)
784 thr_ret = mono_mutex_unlock (&scan_mutex);
785 g_assert (thr_ret == 0);
786 pthread_cleanup_pop (0);
789 /* This might list some shared handles twice if they are already
790 * opened by this process, and the check function returns FALSE the
791 * first time. Shared handles that are created during the search are
792 * unreffed if the check function returns FALSE, so callers must not
793 * rely on the handle persisting (unless the check function returns
796 gpointer _wapi_search_handle (WapiHandleType type,
797 gboolean (*check)(gpointer test, gpointer user),
799 gpointer *handle_specific,
800 gboolean search_shared)
802 struct _WapiHandleUnshared *handle_data = NULL;
803 struct _WapiHandleShared *shared = NULL;
806 gboolean found = FALSE;
809 pthread_cleanup_push ((void(*)(void *))mono_mutex_unlock_in_cleanup,
810 (void *)&scan_mutex);
811 thr_ret = mono_mutex_lock (&scan_mutex);
812 g_assert (thr_ret == 0);
814 for (i = SLOT_INDEX (0); !found && i < _wapi_private_handle_slot_count; i++) {
815 if (_wapi_private_handles [i]) {
816 for (k = SLOT_OFFSET (0); k < _WAPI_HANDLE_INITIAL_COUNT; k++) {
817 handle_data = &_wapi_private_handles [i][k];
819 if (handle_data->type == type) {
820 ret = GUINT_TO_POINTER (i * _WAPI_HANDLE_INITIAL_COUNT + k);
821 if (check (ret, user_data) == TRUE) {
822 _wapi_handle_ref (ret);
825 if (_WAPI_SHARED_HANDLE (type)) {
826 shared = &_wapi_shared_layout->handles[i];
836 thr_ret = mono_mutex_unlock (&scan_mutex);
837 g_assert (thr_ret == 0);
838 pthread_cleanup_pop (0);
840 if (!found && search_shared && _WAPI_SHARED_HANDLE (type)) {
841 /* Not found yet, so search the shared memory too */
843 g_message ("%s: Looking at other shared handles...", __func__);
846 for (i = 0; i < _WAPI_HANDLE_INITIAL_COUNT; i++) {
847 shared = &_wapi_shared_layout->handles[i];
849 if (shared->type == type) {
850 /* Tell new_from_offset to not
851 * timestamp this handle, because
852 * otherwise it will ping every handle
853 * in the list and they will never
856 ret = _wapi_handle_new_from_offset (type, i,
858 if (ret == INVALID_HANDLE_VALUE) {
859 /* This handle was deleted
860 * while we were looking at it
866 g_message ("%s: Opened tmp handle %p (type %s) from offset %d", __func__, ret, _wapi_handle_typename[type], i);
869 /* It's possible that the shared part
870 * of this handle has now been blown
871 * away (after new_from_offset
872 * successfully opened it,) if its
873 * timestamp is too old. The check
874 * function needs to be aware of this,
875 * and cope if the handle has
878 if (check (ret, user_data) == TRUE) {
879 /* Timestamp this handle, but make
880 * sure it still exists first
882 thr_ret = _wapi_handle_lock_shared_handles ();
883 g_assert (thr_ret == 0);
885 if (shared->type == type) {
886 guint32 now = (guint32)(time (NULL) & 0xFFFFFFFF);
887 InterlockedExchange ((gint32 *)&shared->timestamp, now);
890 handle_data = &_WAPI_PRIVATE_HANDLES(GPOINTER_TO_UINT(ret));
892 _wapi_handle_unlock_shared_handles ();
895 /* It's been deleted,
899 _wapi_handle_unlock_shared_handles ();
903 /* This isn't the handle we're looking
904 * for, so drop the reference we took
905 * in _wapi_handle_new_from_offset ()
907 _wapi_handle_unref (ret);
917 if(handle_specific != NULL) {
918 if (_WAPI_SHARED_HANDLE(type)) {
919 g_assert(shared->type == type);
921 *handle_specific = &shared->u;
923 *handle_specific = &handle_data->u;
931 /* Returns the offset of the metadata array, or -1 on error, or 0 for
932 * not found (0 is not a valid offset)
934 gint32 _wapi_search_handle_namespace (WapiHandleType type,
937 struct _WapiHandleShared *shared_handle_data;
942 g_assert(_WAPI_SHARED_HANDLE(type));
945 g_message ("%s: Lookup for handle named [%s] type %s", __func__,
946 utf8_name, _wapi_handle_typename[type]);
949 /* Do a handle collection before starting to look, so that any
950 * stale cruft gets removed
952 _wapi_handle_collect ();
954 thr_ret = _wapi_handle_lock_shared_handles ();
955 g_assert (thr_ret == 0);
957 for(i = 1; i < _WAPI_HANDLE_INITIAL_COUNT; i++) {
958 WapiSharedNamespace *sharedns;
960 shared_handle_data = &_wapi_shared_layout->handles[i];
962 /* Check mutex, event, semaphore, timer, job and
963 * file-mapping object names. So far only mutex,
964 * semaphore and event are implemented.
966 if (!_WAPI_SHARED_NAMESPACE (shared_handle_data->type)) {
971 g_message ("%s: found a shared namespace handle at 0x%x (type %s)", __func__, i, _wapi_handle_typename[shared_handle_data->type]);
974 sharedns=(WapiSharedNamespace *)&shared_handle_data->u;
977 g_message ("%s: name is [%s]", __func__, sharedns->name);
980 if (strcmp (sharedns->name, utf8_name) == 0) {
981 if (shared_handle_data->type != type) {
982 /* Its the wrong type, so fail now */
984 g_message ("%s: handle 0x%x matches name but is wrong type: %s", __func__, i, _wapi_handle_typename[shared_handle_data->type]);
990 g_message ("%s: handle 0x%x matches name and type", __func__, i);
999 _wapi_handle_unlock_shared_handles ();
1004 void _wapi_handle_ref (gpointer handle)
1006 guint32 idx = GPOINTER_TO_UINT(handle);
1007 guint32 now = (guint32)(time (NULL) & 0xFFFFFFFF);
1008 struct _WapiHandleUnshared *handle_data;
1010 if (!_WAPI_PRIVATE_VALID_SLOT (idx)) {
1014 if (_wapi_handle_type (handle) == WAPI_HANDLE_UNUSED) {
1015 g_warning ("%s: Attempting to ref unused handle %p", __func__,
1020 handle_data = &_WAPI_PRIVATE_HANDLES(idx);
1022 InterlockedIncrement ((gint32 *)&handle_data->ref);
1024 /* It's possible for processes to exit before getting around
1025 * to updating timestamps in the collection thread, so if a
1026 * shared handle is reffed do the timestamp here as well just
1029 if (_WAPI_SHARED_HANDLE(handle_data->type)) {
1030 struct _WapiHandleShared *shared_data = &_wapi_shared_layout->handles[handle_data->u.shared.offset];
1032 InterlockedExchange ((gint32 *)&shared_data->timestamp, now);
1036 g_message ("%s: %s handle %p ref now %d", __func__,
1037 _wapi_handle_typename[_WAPI_PRIVATE_HANDLES (idx).type],
1039 _WAPI_PRIVATE_HANDLES(idx).ref);
1043 /* The handle must not be locked on entry to this function */
1044 void _wapi_handle_unref (gpointer handle)
1046 guint32 idx = GPOINTER_TO_UINT(handle);
1047 gboolean destroy = FALSE;
1050 if (!_WAPI_PRIVATE_VALID_SLOT (idx)) {
1054 if (_wapi_handle_type (handle) == WAPI_HANDLE_UNUSED) {
1055 g_warning ("%s: Attempting to unref unused handle %p",
1060 /* Possible race condition here if another thread refs the
1061 * handle between here and setting the type to UNUSED. I
1062 * could lock a mutex, but I'm not sure that allowing a handle
1063 * reference to reach 0 isn't an application bug anyway.
1065 destroy = (InterlockedDecrement ((gint32 *)&_WAPI_PRIVATE_HANDLES(idx).ref) ==0);
1068 g_message ("%s: %s handle %p ref now %d (destroy %s)", __func__,
1069 _wapi_handle_typename[_WAPI_PRIVATE_HANDLES (idx).type],
1071 _WAPI_PRIVATE_HANDLES(idx).ref, destroy?"TRUE":"FALSE");
1075 /* Need to copy the handle info, reset the slot in the
1076 * array, and _only then_ call the close function to
1077 * avoid race conditions (eg file descriptors being
1078 * closed, and another file being opened getting the
1079 * same fd racing the memset())
1081 struct _WapiHandleUnshared handle_data;
1082 struct _WapiHandleShared shared_handle_data;
1083 WapiHandleType type = _WAPI_PRIVATE_HANDLES(idx).type;
1084 void (*close_func)(gpointer, gpointer) = _wapi_handle_ops_get_close_func (type);
1085 gboolean is_shared = _WAPI_SHARED_HANDLE(type);
1088 /* If this is a shared handle we need to take
1089 * the shared lock outside of the scan_mutex
1090 * lock to avoid deadlocks
1092 thr_ret = _wapi_handle_lock_shared_handles ();
1093 g_assert (thr_ret == 0);
1096 pthread_cleanup_push ((void(*)(void *))mono_mutex_unlock_in_cleanup, (void *)&scan_mutex);
1097 thr_ret = mono_mutex_lock (&scan_mutex);
1100 g_message ("%s: Destroying handle %p", __func__, handle);
1103 memcpy (&handle_data, &_WAPI_PRIVATE_HANDLES(idx),
1104 sizeof (struct _WapiHandleUnshared));
1106 memset (&_WAPI_PRIVATE_HANDLES(idx).u, '\0',
1107 sizeof(_WAPI_PRIVATE_HANDLES(idx).u));
1109 _WAPI_PRIVATE_HANDLES(idx).type = WAPI_HANDLE_UNUSED;
1112 /* Destroy the mutex and cond var. We hope nobody
1113 * tried to grab them between the handle unlock and
1114 * now, but pthreads doesn't have a
1115 * "unlock_and_destroy" atomic function.
1117 thr_ret = mono_mutex_destroy (&_WAPI_PRIVATE_HANDLES(idx).signal_mutex);
1118 g_assert (thr_ret == 0);
1120 thr_ret = pthread_cond_destroy (&_WAPI_PRIVATE_HANDLES(idx).signal_cond);
1121 g_assert (thr_ret == 0);
1123 struct _WapiHandleShared *shared = &_wapi_shared_layout->handles[handle_data.u.shared.offset];
1125 memcpy (&shared_handle_data, shared,
1126 sizeof (struct _WapiHandleShared));
1128 /* It's possible that this handle is already
1129 * pointing at a deleted shared section
1132 g_message ("%s: %s handle %p shared refs before dec %d", __func__, _wapi_handle_typename[type], handle, shared->handle_refs);
1135 if (shared->handle_refs > 0) {
1136 shared->handle_refs--;
1137 if (shared->handle_refs == 0) {
1138 memset (shared, '\0', sizeof (struct _WapiHandleShared));
1143 thr_ret = mono_mutex_unlock (&scan_mutex);
1144 g_assert (thr_ret == 0);
1145 pthread_cleanup_pop (0);
1148 _wapi_handle_unlock_shared_handles ();
1151 if (close_func != NULL) {
1153 close_func (handle, &shared_handle_data.u);
1155 close_func (handle, &handle_data.u);
1161 void _wapi_handle_register_capabilities (WapiHandleType type,
1162 WapiHandleCapability caps)
1164 handle_caps[type] = caps;
1167 gboolean _wapi_handle_test_capabilities (gpointer handle,
1168 WapiHandleCapability caps)
1170 guint32 idx = GPOINTER_TO_UINT(handle);
1171 WapiHandleType type;
1173 if (!_WAPI_PRIVATE_VALID_SLOT (idx)) {
1177 type = _WAPI_PRIVATE_HANDLES(idx).type;
1180 g_message ("%s: testing 0x%x against 0x%x (%d)", __func__,
1181 handle_caps[type], caps, handle_caps[type] & caps);
1184 return((handle_caps[type] & caps) != 0);
1187 static void (*_wapi_handle_ops_get_close_func (WapiHandleType type))(gpointer, gpointer)
1189 if (handle_ops[type] != NULL &&
1190 handle_ops[type]->close != NULL) {
1191 return (handle_ops[type]->close);
1197 void _wapi_handle_ops_close (gpointer handle, gpointer data)
1199 guint32 idx = GPOINTER_TO_UINT(handle);
1200 WapiHandleType type;
1202 if (!_WAPI_PRIVATE_VALID_SLOT (idx)) {
1206 type = _WAPI_PRIVATE_HANDLES(idx).type;
1208 if (handle_ops[type] != NULL &&
1209 handle_ops[type]->close != NULL) {
1210 handle_ops[type]->close (handle, data);
1214 void _wapi_handle_ops_signal (gpointer handle)
1216 guint32 idx = GPOINTER_TO_UINT(handle);
1217 WapiHandleType type;
1219 if (!_WAPI_PRIVATE_VALID_SLOT (idx)) {
1223 type = _WAPI_PRIVATE_HANDLES(idx).type;
1225 if (handle_ops[type] != NULL && handle_ops[type]->signal != NULL) {
1226 handle_ops[type]->signal (handle);
1230 gboolean _wapi_handle_ops_own (gpointer handle)
1232 guint32 idx = GPOINTER_TO_UINT(handle);
1233 WapiHandleType type;
1235 if (!_WAPI_PRIVATE_VALID_SLOT (idx)) {
1239 type = _WAPI_PRIVATE_HANDLES(idx).type;
1241 if (handle_ops[type] != NULL && handle_ops[type]->own_handle != NULL) {
1242 return(handle_ops[type]->own_handle (handle));
1248 gboolean _wapi_handle_ops_isowned (gpointer handle)
1250 guint32 idx = GPOINTER_TO_UINT(handle);
1251 WapiHandleType type;
1253 if (!_WAPI_PRIVATE_VALID_SLOT (idx)) {
1257 type = _WAPI_PRIVATE_HANDLES(idx).type;
1259 if (handle_ops[type] != NULL && handle_ops[type]->is_owned != NULL) {
1260 return(handle_ops[type]->is_owned (handle));
1266 guint32 _wapi_handle_ops_special_wait (gpointer handle, guint32 timeout)
1268 guint32 idx = GPOINTER_TO_UINT(handle);
1269 WapiHandleType type;
1271 if (!_WAPI_PRIVATE_VALID_SLOT (idx)) {
1272 return(WAIT_FAILED);
1275 type = _WAPI_PRIVATE_HANDLES(idx).type;
1277 if (handle_ops[type] != NULL &&
1278 handle_ops[type]->special_wait != NULL) {
1279 return(handle_ops[type]->special_wait (handle, timeout));
1281 return(WAIT_FAILED);
1285 void _wapi_handle_ops_prewait (gpointer handle)
1287 guint32 idx = GPOINTER_TO_UINT (handle);
1288 WapiHandleType type;
1290 if (!_WAPI_PRIVATE_VALID_SLOT (idx)) {
1294 type = _WAPI_PRIVATE_HANDLES (idx).type;
1296 if (handle_ops[type] != NULL &&
1297 handle_ops[type]->prewait != NULL) {
1298 handle_ops[type]->prewait (handle);
1305 * @handle: The handle to release
1307 * Closes and invalidates @handle, releasing any resources it
1308 * consumes. When the last handle to a temporary or non-persistent
1309 * object is closed, that object can be deleted. Closing the same
1310 * handle twice is an error.
1312 * Return value: %TRUE on success, %FALSE otherwise.
1314 gboolean CloseHandle(gpointer handle)
1316 if (handle == NULL) {
1317 /* Problem: because we map file descriptors to the
1318 * same-numbered handle we can't tell the difference
1319 * between a bogus handle and the handle to stdin.
1320 * Assume that it's the console handle if that handle
1323 if (_WAPI_PRIVATE_HANDLES (0).type != WAPI_HANDLE_CONSOLE) {
1324 SetLastError (ERROR_INVALID_PARAMETER);
1328 if (handle == _WAPI_HANDLE_INVALID){
1329 SetLastError (ERROR_INVALID_PARAMETER);
1333 _wapi_handle_unref (handle);
1338 /* Lots more to implement here, but this is all we need at the moment */
1339 gboolean DuplicateHandle (gpointer srcprocess, gpointer src,
1340 gpointer targetprocess, gpointer *target,
1341 guint32 access G_GNUC_UNUSED, gboolean inherit G_GNUC_UNUSED, guint32 options G_GNUC_UNUSED)
1343 if (srcprocess != _WAPI_PROCESS_CURRENT ||
1344 targetprocess != _WAPI_PROCESS_CURRENT) {
1345 /* Duplicating other process's handles is not supported */
1346 SetLastError (ERROR_INVALID_HANDLE);
1350 if (src == _WAPI_PROCESS_CURRENT) {
1351 *target = _wapi_process_duplicate ();
1352 } else if (src == _WAPI_THREAD_CURRENT) {
1353 *target = _wapi_thread_duplicate ();
1355 _wapi_handle_ref (src);
1362 gboolean _wapi_handle_count_signalled_handles (guint32 numhandles,
1368 guint32 count, i, iter=0;
1371 WapiHandleType type;
1373 /* Lock all the handles, with backoff */
1375 thr_ret = _wapi_handle_lock_shared_handles ();
1376 g_assert (thr_ret == 0);
1378 for(i=0; i<numhandles; i++) {
1379 gpointer handle = handles[i];
1380 guint32 idx = GPOINTER_TO_UINT(handle);
1383 g_message ("%s: attempting to lock %p", __func__, handle);
1386 type = _WAPI_PRIVATE_HANDLES(idx).type;
1388 thr_ret = _wapi_handle_trylock_handle (handle);
1394 g_message ("%s: attempt failed for %p: %s", __func__,
1395 handle, strerror (thr_ret));
1398 thr_ret = _wapi_handle_unlock_shared_handles ();
1399 g_assert (thr_ret == 0);
1402 handle = handles[i];
1403 idx = GPOINTER_TO_UINT(handle);
1405 thr_ret = _wapi_handle_unlock_handle (handle);
1406 g_assert (thr_ret == 0);
1409 /* If iter ever reaches 100 the nanosleep will
1410 * return EINVAL immediately, but we have a
1411 * design flaw if that happens.
1415 g_warning ("%s: iteration overflow!",
1421 g_message ("%s: Backing off for %d ms", __func__,
1424 _wapi_handle_spin (10 * iter);
1431 g_message ("%s: Locked all handles", __func__);
1437 for(i=0; i<numhandles; i++) {
1438 gpointer handle = handles[i];
1439 guint32 idx = GPOINTER_TO_UINT(handle);
1441 type = _WAPI_PRIVATE_HANDLES(idx).type;
1444 g_message ("%s: Checking handle %p", __func__, handle);
1447 if(((_wapi_handle_test_capabilities (handle, WAPI_HANDLE_CAP_OWN)==TRUE) &&
1448 (_wapi_handle_ops_isowned (handle) == TRUE)) ||
1449 (_WAPI_SHARED_HANDLE(type) &&
1450 WAPI_SHARED_HANDLE_DATA(handle).signalled == TRUE) ||
1451 (!_WAPI_SHARED_HANDLE(type) &&
1452 _WAPI_PRIVATE_HANDLES(idx).signalled == TRUE)) {
1456 g_message ("%s: Handle %p signalled", __func__,
1466 g_message ("%s: %d event handles signalled", __func__, count);
1469 if ((waitall == TRUE && count == numhandles) ||
1470 (waitall == FALSE && count > 0)) {
1477 g_message ("%s: Returning %d", __func__, ret);
1485 void _wapi_handle_unlock_handles (guint32 numhandles, gpointer *handles)
1490 thr_ret = _wapi_handle_unlock_shared_handles ();
1491 g_assert (thr_ret == 0);
1493 for(i=0; i<numhandles; i++) {
1494 gpointer handle = handles[i];
1497 g_message ("%s: unlocking handle %p", __func__, handle);
1500 thr_ret = _wapi_handle_unlock_handle (handle);
1501 g_assert (thr_ret == 0);
1505 static int timedwait_signal_poll_cond (pthread_cond_t *cond, mono_mutex_t *mutex, struct timespec *timeout, gboolean alertable)
1507 struct timespec fake_timeout;
1512 ret=mono_cond_timedwait (cond, mutex, timeout);
1514 ret=mono_cond_wait (cond, mutex);
1516 _wapi_calc_timeout (&fake_timeout, 100);
1518 if (timeout != NULL && ((fake_timeout.tv_sec > timeout->tv_sec) ||
1519 (fake_timeout.tv_sec == timeout->tv_sec &&
1520 fake_timeout.tv_nsec > timeout->tv_nsec))) {
1521 /* Real timeout is less than 100ms time */
1522 ret=mono_cond_timedwait (cond, mutex, timeout);
1524 ret=mono_cond_timedwait (cond, mutex, &fake_timeout);
1526 /* Mask the fake timeout, this will cause
1527 * another poll if the cond was not really signaled
1529 if (ret==ETIMEDOUT) {
1538 int _wapi_handle_wait_signal (gboolean poll)
1540 return _wapi_handle_timedwait_signal_handle (_wapi_global_signal_handle, NULL, TRUE, poll);
1543 int _wapi_handle_timedwait_signal (struct timespec *timeout, gboolean poll)
1545 return _wapi_handle_timedwait_signal_handle (_wapi_global_signal_handle, timeout, TRUE, poll);
1548 int _wapi_handle_wait_signal_handle (gpointer handle, gboolean alertable)
1551 g_message ("%s: waiting for %p", __func__, handle);
1554 return _wapi_handle_timedwait_signal_handle (handle, NULL, alertable, FALSE);
1557 int _wapi_handle_timedwait_signal_handle (gpointer handle,
1558 struct timespec *timeout, gboolean alertable, gboolean poll)
1561 g_message ("%s: waiting for %p (type %s)", __func__, handle,
1562 _wapi_handle_typename[_wapi_handle_type (handle)]);
1565 if (_WAPI_SHARED_HANDLE (_wapi_handle_type (handle))) {
1566 if (WAPI_SHARED_HANDLE_DATA(handle).signalled == TRUE) {
1569 if (timeout != NULL) {
1570 struct timespec fake_timeout;
1571 _wapi_calc_timeout (&fake_timeout, 100);
1573 if ((fake_timeout.tv_sec > timeout->tv_sec) ||
1574 (fake_timeout.tv_sec == timeout->tv_sec &&
1575 fake_timeout.tv_nsec > timeout->tv_nsec)) {
1576 /* FIXME: Real timeout is less than
1577 * 100ms time, but is it really worth
1578 * calculating to the exact ms?
1580 _wapi_handle_spin (100);
1582 if (WAPI_SHARED_HANDLE_DATA(handle).signalled == TRUE) {
1589 _wapi_handle_spin (100);
1593 guint32 idx = GPOINTER_TO_UINT(handle);
1595 pthread_cond_t *cond;
1596 mono_mutex_t *mutex;
1598 if (alertable && !wapi_thread_set_wait_handle (handle))
1601 cond = &_WAPI_PRIVATE_HANDLES (idx).signal_cond;
1602 mutex = &_WAPI_PRIVATE_HANDLES (idx).signal_mutex;
1605 /* This is needed when waiting for process handles */
1606 res = timedwait_signal_poll_cond (cond, mutex, timeout, alertable);
1609 res = mono_cond_timedwait (cond, mutex, timeout);
1611 res = mono_cond_wait (cond, mutex);
1615 wapi_thread_clear_wait_handle (handle);
1621 gboolean _wapi_handle_get_or_set_share (dev_t device, ino_t inode,
1622 guint32 new_sharemode,
1624 guint32 *old_sharemode,
1625 guint32 *old_access,
1626 struct _WapiFileShare **share_info)
1628 struct _WapiFileShare *file_share;
1629 guint32 now = (guint32)(time(NULL) & 0xFFFFFFFF);
1630 int thr_ret, i, first_unused = -1;
1631 gboolean exists = FALSE;
1633 /* Prevents entries from expiring under us as we search
1635 thr_ret = _wapi_handle_lock_shared_handles ();
1636 g_assert (thr_ret == 0);
1638 /* Prevent new entries racing with us */
1639 thr_ret = _wapi_shm_sem_lock (_WAPI_SHARED_SEM_FILESHARE);
1640 g_assert (thr_ret == 0);
1642 /* If a linear scan gets too slow we'll have to fit a hash
1643 * table onto the shared mem backing store
1646 for (i = 0; i <= _wapi_fileshare_layout->hwm; i++) {
1647 file_share = &_wapi_fileshare_layout->share_info[i];
1649 /* Make a note of an unused slot, in case we need to
1652 if (first_unused == -1 && file_share->handle_refs == 0) {
1657 if (file_share->handle_refs == 0) {
1661 if (file_share->device == device &&
1662 file_share->inode == inode) {
1663 *old_sharemode = file_share->sharemode;
1664 *old_access = file_share->access;
1665 *share_info = file_share;
1667 /* Increment the reference count while we
1668 * still have sole access to the shared area.
1669 * This makes the increment atomic wrt
1672 InterlockedIncrement ((gint32 *)&file_share->handle_refs);
1680 if (i == _WAPI_FILESHARE_SIZE && first_unused == -1) {
1683 if (first_unused == -1) {
1684 file_share = &_wapi_fileshare_layout->share_info[++i];
1685 _wapi_fileshare_layout->hwm = i;
1687 file_share = &_wapi_fileshare_layout->share_info[first_unused];
1690 file_share->device = device;
1691 file_share->inode = inode;
1692 file_share->opened_by_pid = _wapi_getpid ();
1693 file_share->sharemode = new_sharemode;
1694 file_share->access = new_access;
1695 file_share->handle_refs = 1;
1696 *share_info = file_share;
1700 if (*share_info != NULL) {
1701 InterlockedExchange ((gint32 *)&(*share_info)->timestamp, now);
1704 thr_ret = _wapi_shm_sem_unlock (_WAPI_SHARED_SEM_FILESHARE);
1706 _wapi_handle_unlock_shared_handles ();
1711 /* If we don't have the info in /proc, check if the process that
1712 * opened this share info is still there (it's not a perfect method,
1715 static void _wapi_handle_check_share_by_pid (struct _WapiFileShare *share_info)
1717 if (kill (share_info->opened_by_pid, 0) == -1 &&
1720 /* It's gone completely (or there's a new process
1721 * owned by someone else) so mark this share info as
1725 g_message ("%s: Didn't find it, destroying entry", __func__);
1728 memset (share_info, '\0', sizeof(struct _WapiFileShare));
1733 /* Scan /proc/<pids>/fd/ for open file descriptors to the file in
1734 * question. If there are none, reset the share info.
1736 * This implementation is Linux-specific; legacy systems will have to
1737 * implement their own ways of finding out if a particular file is
1738 * open by a process.
1740 void _wapi_handle_check_share (struct _WapiFileShare *share_info, int fd)
1742 gboolean found = FALSE, proc_fds = FALSE;
1743 pid_t self = _wapi_getpid ();
1747 /* Prevents entries from expiring under us if we remove this
1750 thr_ret = _wapi_handle_lock_shared_handles ();
1751 g_assert (thr_ret == 0);
1753 /* Prevent new entries racing with us */
1754 thr_ret = _wapi_shm_sem_lock (_WAPI_SHARED_SEM_FILESHARE);
1755 g_assert (thr_ret == 0);
1757 /* If there is no /proc, there's nothing more we can do here */
1758 if (access ("/proc", F_OK) == -1) {
1759 _wapi_handle_check_share_by_pid (share_info);
1763 /* If there's another handle that thinks it owns this fd, then even
1764 * if the fd has been closed behind our back consider it still owned.
1765 * See bugs 75764 and 75891
1767 for (i = 0; i < _wapi_fd_reserve; i++) {
1768 if (_wapi_private_handles [SLOT_INDEX (i)]) {
1769 struct _WapiHandleUnshared *handle = &_WAPI_PRIVATE_HANDLES(i);
1772 handle->type == WAPI_HANDLE_FILE) {
1773 struct _WapiHandle_file *file_handle = &handle->u.file;
1775 if (file_handle->share_info == share_info) {
1777 g_message ("%s: handle 0x%x has this file open!",
1787 for (i = 0; i < _WAPI_HANDLE_INITIAL_COUNT; i++) {
1788 struct _WapiHandleShared *shared;
1789 struct _WapiHandle_process *process_handle;
1791 shared = &_wapi_shared_layout->handles[i];
1793 if (shared->type == WAPI_HANDLE_PROCESS) {
1795 struct dirent *fd_entry;
1796 char subdir[_POSIX_PATH_MAX];
1798 process_handle = &shared->u.process;
1799 pid = process_handle->id;
1801 /* Look in /proc/<pid>/fd/ but ignore
1802 * /proc/<our pid>/fd/<fd>, as we have the
1805 g_snprintf (subdir, _POSIX_PATH_MAX, "/proc/%d/fd",
1808 fd_dir = opendir (subdir);
1809 if (fd_dir == NULL) {
1814 g_message ("%s: Looking in %s", __func__, subdir);
1819 while ((fd_entry = readdir (fd_dir)) != NULL) {
1820 char path[_POSIX_PATH_MAX];
1821 struct stat link_stat;
1823 if (!strcmp (fd_entry->d_name, ".") ||
1824 !strcmp (fd_entry->d_name, "..") ||
1826 fd == atoi (fd_entry->d_name))) {
1830 g_snprintf (path, _POSIX_PATH_MAX,
1831 "/proc/%d/fd/%s", pid,
1834 stat (path, &link_stat);
1835 if (link_stat.st_dev == share_info->device &&
1836 link_stat.st_ino == share_info->inode) {
1838 g_message ("%s: Found it at %s",
1850 if (proc_fds == FALSE) {
1851 _wapi_handle_check_share_by_pid (share_info);
1852 } else if (found == FALSE) {
1853 /* Blank out this entry, as it is stale */
1855 g_message ("%s: Didn't find it, destroying entry", __func__);
1858 memset (share_info, '\0', sizeof(struct _WapiFileShare));
1862 thr_ret = _wapi_shm_sem_unlock (_WAPI_SHARED_SEM_FILESHARE);
1864 _wapi_handle_unlock_shared_handles ();
1868 // Other implementations (non-Linux)
1870 void _wapi_handle_check_share (struct _WapiFileShare *share_info, int fd)
1874 /* Prevents entries from expiring under us if we remove this
1876 thr_ret = _wapi_handle_lock_shared_handles ();
1877 g_assert (thr_ret == 0);
1879 /* Prevent new entries racing with us */
1880 thr_ret = _wapi_shm_sem_lock (_WAPI_SHARED_SEM_FILESHARE);
1881 g_assert (thr_ret == 0);
1883 _wapi_handle_check_share_by_pid (share_info);
1885 thr_ret = _wapi_shm_sem_unlock (_WAPI_SHARED_SEM_FILESHARE);
1886 _wapi_handle_unlock_shared_handles ();
1890 void _wapi_handle_dump (void)
1892 struct _WapiHandleUnshared *handle_data;
1896 pthread_cleanup_push ((void(*)(void *))mono_mutex_unlock_in_cleanup,
1897 (void *)&scan_mutex);
1898 thr_ret = mono_mutex_lock (&scan_mutex);
1899 g_assert (thr_ret == 0);
1901 for(i = SLOT_INDEX (0); i < _wapi_private_handle_slot_count; i++) {
1902 if (_wapi_private_handles [i]) {
1903 for (k = SLOT_OFFSET (0); k < _WAPI_HANDLE_INITIAL_COUNT; k++) {
1904 handle_data = &_wapi_private_handles [i][k];
1906 if (handle_data->type == WAPI_HANDLE_UNUSED) {
1910 g_print ("%3x [%7s] %s %d ",
1911 i * _WAPI_HANDLE_INITIAL_COUNT + k,
1912 _wapi_handle_typename[handle_data->type],
1913 handle_data->signalled?"Sg":"Un",
1915 handle_details[handle_data->type](&handle_data->u);
1921 thr_ret = mono_mutex_unlock (&scan_mutex);
1922 g_assert (thr_ret == 0);
1923 pthread_cleanup_pop (0);
1926 static void _wapi_shared_details (gpointer handle_info)
1928 struct _WapiHandle_shared_ref *shared = (struct _WapiHandle_shared_ref *)handle_info;
1930 g_print ("offset: 0x%x", shared->offset);
1933 void _wapi_handle_update_refs (void)
1937 guint32 now = (guint32)(time (NULL) & 0xFFFFFFFF);
1939 thr_ret = _wapi_handle_lock_shared_handles ();
1940 g_assert (thr_ret == 0);
1942 /* Prevent file share entries racing with us */
1943 thr_ret = _wapi_shm_sem_lock (_WAPI_SHARED_SEM_FILESHARE);
1944 g_assert(thr_ret == 0);
1946 pthread_cleanup_push ((void(*)(void *))mono_mutex_unlock_in_cleanup,
1947 (void *)&scan_mutex);
1948 thr_ret = mono_mutex_lock (&scan_mutex);
1950 for(i = SLOT_INDEX (0); i < _wapi_private_handle_slot_count; i++) {
1951 if (_wapi_private_handles [i]) {
1952 for (k = SLOT_OFFSET (0); k < _WAPI_HANDLE_INITIAL_COUNT; k++) {
1953 struct _WapiHandleUnshared *handle = &_wapi_private_handles [i][k];
1955 if (_WAPI_SHARED_HANDLE(handle->type)) {
1956 struct _WapiHandleShared *shared_data;
1959 g_message ("%s: (%d) handle 0x%x is SHARED (%s)", __func__, _wapi_getpid (), i * _WAPI_HANDLE_INITIAL_COUNT + k, _wapi_handle_typename[handle->type]);
1962 shared_data = &_wapi_shared_layout->handles[handle->u.shared.offset];
1965 g_message ("%s: (%d) Updating timestamp of handle 0x%x", __func__, _wapi_getpid (), handle->u.shared.offset);
1968 InterlockedExchange ((gint32 *)&shared_data->timestamp, now);
1969 } else if (handle->type == WAPI_HANDLE_FILE) {
1970 struct _WapiHandle_file *file_handle = &handle->u.file;
1973 g_message ("%s: (%d) handle 0x%x is FILE", __func__, _wapi_getpid (), i * _WAPI_HANDLE_INITIAL_COUNT + k);
1976 g_assert (file_handle->share_info != NULL);
1979 g_message ("%s: (%d) Inc refs on fileshare 0x%x", __func__, _wapi_getpid (), (file_handle->share_info - &_wapi_fileshare_layout->share_info[0]) / sizeof(struct _WapiFileShare));
1982 InterlockedExchange ((gint32 *)&file_handle->share_info->timestamp, now);
1988 thr_ret = mono_mutex_unlock (&scan_mutex);
1989 g_assert (thr_ret == 0);
1990 pthread_cleanup_pop (0);
1992 thr_ret = _wapi_shm_sem_unlock (_WAPI_SHARED_SEM_FILESHARE);
1994 _wapi_handle_unlock_shared_handles ();