Check for an empty string not a NULL pointer.
[wine/dcerpc.git] / server / thread.c
blobbddabb0833d890384da50f6d8b3b2443c9eb0546
1 /*
2 * Server-side thread management
4 * Copyright (C) 1998 Alexandre Julliard
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 #include "config.h"
22 #include "wine/port.h"
24 #include <assert.h>
25 #include <errno.h>
26 #include <fcntl.h>
27 #include <signal.h>
28 #include <stdarg.h>
29 #include <stdio.h>
30 #include <stdlib.h>
31 #include <string.h>
32 #include <sys/types.h>
33 #include <unistd.h>
34 #include <time.h>
35 #ifdef HAVE_POLL_H
36 #include <poll.h>
37 #endif
39 #include "windef.h"
41 #include "file.h"
42 #include "handle.h"
43 #include "process.h"
44 #include "thread.h"
45 #include "request.h"
46 #include "user.h"
47 #include "security.h"
50 /* thread queues */
52 struct thread_wait
54 struct thread_wait *next; /* next wait structure for this thread */
55 struct thread *thread; /* owner thread */
56 int count; /* count of objects */
57 int flags;
58 void *cookie; /* magic cookie to return to client */
59 struct timeval timeout;
60 struct timeout_user *user;
61 struct wait_queue_entry queues[1];
64 /* asynchronous procedure calls */
66 struct thread_apc
68 struct list entry; /* queue linked list */
69 struct object *owner; /* object that queued this apc */
70 void *func; /* function to call in client */
71 enum apc_type type; /* type of apc function */
72 int nb_args; /* number of arguments */
73 void *arg1; /* function arguments */
74 void *arg2;
75 void *arg3;
79 /* thread operations */
81 static void dump_thread( struct object *obj, int verbose );
82 static int thread_signaled( struct object *obj, struct thread *thread );
83 static void thread_poll_event( struct fd *fd, int event );
84 static void destroy_thread( struct object *obj );
85 static struct thread_apc *thread_dequeue_apc( struct thread *thread, int system_only );
87 static const struct object_ops thread_ops =
89 sizeof(struct thread), /* size */
90 dump_thread, /* dump */
91 add_queue, /* add_queue */
92 remove_queue, /* remove_queue */
93 thread_signaled, /* signaled */
94 no_satisfied, /* satisfied */
95 no_signal, /* signal */
96 no_get_fd, /* get_fd */
97 no_close_handle, /* close_handle */
98 destroy_thread /* destroy */
101 static const struct fd_ops thread_fd_ops =
103 NULL, /* get_poll_events */
104 thread_poll_event, /* poll_event */
105 no_flush, /* flush */
106 no_get_file_info, /* get_file_info */
107 no_queue_async, /* queue_async */
108 no_cancel_async /* cancel_async */
111 static struct list thread_list = LIST_INIT(thread_list);
113 /* initialize the structure for a newly allocated thread */
114 inline static void init_thread_structure( struct thread *thread )
116 int i;
118 thread->unix_pid = -1; /* not known yet */
119 thread->unix_tid = -1; /* not known yet */
120 thread->context = NULL;
121 thread->teb = NULL;
122 thread->debug_ctx = NULL;
123 thread->debug_event = NULL;
124 thread->queue = NULL;
125 thread->wait = NULL;
126 thread->error = 0;
127 thread->req_data = NULL;
128 thread->req_toread = 0;
129 thread->reply_data = NULL;
130 thread->reply_towrite = 0;
131 thread->request_fd = NULL;
132 thread->reply_fd = NULL;
133 thread->wait_fd = NULL;
134 thread->state = RUNNING;
135 thread->attached = 0;
136 thread->exit_code = 0;
137 thread->priority = THREAD_PRIORITY_NORMAL;
138 thread->affinity = 1;
139 thread->suspend = 0;
140 thread->creation_time = time(NULL);
141 thread->exit_time = 0;
142 thread->desktop_users = 0;
144 list_init( &thread->mutex_list );
145 list_init( &thread->system_apc );
146 list_init( &thread->user_apc );
148 for (i = 0; i < MAX_INFLIGHT_FDS; i++)
149 thread->inflight[i].server = thread->inflight[i].client = -1;
152 /* check if address looks valid for a client-side data structure (TEB etc.) */
153 static inline int is_valid_address( void *addr )
155 return addr && !((unsigned int)addr % sizeof(int));
158 /* create a new thread */
159 struct thread *create_thread( int fd, struct process *process )
161 struct thread *thread;
163 if (!(thread = alloc_object( &thread_ops ))) return NULL;
165 init_thread_structure( thread );
167 thread->process = (struct process *)grab_object( process );
168 thread->desktop = process->desktop;
169 if (!current) current = thread;
171 list_add_head( &thread_list, &thread->entry );
173 if (!(thread->id = alloc_ptid( thread )))
175 release_object( thread );
176 return NULL;
178 if (!(thread->request_fd = create_anonymous_fd( &thread_fd_ops, fd, &thread->obj )))
180 release_object( thread );
181 return NULL;
184 thread->token = (struct token *) grab_object( process->token );
186 set_fd_events( thread->request_fd, POLLIN ); /* start listening to events */
187 add_process_thread( thread->process, thread );
188 return thread;
191 /* handle a client event */
192 static void thread_poll_event( struct fd *fd, int event )
194 struct thread *thread = get_fd_user( fd );
195 assert( thread->obj.ops == &thread_ops );
197 if (event & (POLLERR | POLLHUP)) kill_thread( thread, 0 );
198 else if (event & POLLIN) read_request( thread );
199 else if (event & POLLOUT) write_reply( thread );
202 /* cleanup everything that is no longer needed by a dead thread */
203 /* used by destroy_thread and kill_thread */
204 static void cleanup_thread( struct thread *thread )
206 int i;
207 struct thread_apc *apc;
209 while ((apc = thread_dequeue_apc( thread, 0 ))) free( apc );
210 if (thread->req_data) free( thread->req_data );
211 if (thread->reply_data) free( thread->reply_data );
212 if (thread->request_fd) release_object( thread->request_fd );
213 if (thread->reply_fd) release_object( thread->reply_fd );
214 if (thread->wait_fd) release_object( thread->wait_fd );
215 free_msg_queue( thread );
216 cleanup_clipboard_thread(thread);
217 destroy_thread_windows( thread );
218 close_thread_desktop( thread );
219 for (i = 0; i < MAX_INFLIGHT_FDS; i++)
221 if (thread->inflight[i].client != -1)
223 close( thread->inflight[i].server );
224 thread->inflight[i].client = thread->inflight[i].server = -1;
227 thread->req_data = NULL;
228 thread->reply_data = NULL;
229 thread->request_fd = NULL;
230 thread->reply_fd = NULL;
231 thread->wait_fd = NULL;
232 thread->desktop = 0;
235 /* destroy a thread when its refcount is 0 */
236 static void destroy_thread( struct object *obj )
238 struct thread_apc *apc;
239 struct thread *thread = (struct thread *)obj;
240 assert( obj->ops == &thread_ops );
242 assert( !thread->debug_ctx ); /* cannot still be debugging something */
243 list_remove( &thread->entry );
244 while ((apc = thread_dequeue_apc( thread, 0 ))) free( apc );
245 cleanup_thread( thread );
246 release_object( thread->process );
247 if (thread->id) free_ptid( thread->id );
248 if (thread->token) release_object( thread->token );
251 /* dump a thread on stdout for debugging purposes */
252 static void dump_thread( struct object *obj, int verbose )
254 struct thread *thread = (struct thread *)obj;
255 assert( obj->ops == &thread_ops );
257 fprintf( stderr, "Thread id=%04x unix pid=%d unix tid=%d teb=%p state=%d\n",
258 thread->id, thread->unix_pid, thread->unix_tid, thread->teb, thread->state );
261 static int thread_signaled( struct object *obj, struct thread *thread )
263 struct thread *mythread = (struct thread *)obj;
264 return (mythread->state == TERMINATED);
267 /* get a thread pointer from a thread id (and increment the refcount) */
268 struct thread *get_thread_from_id( thread_id_t id )
270 struct object *obj = get_ptid_entry( id );
272 if (obj && obj->ops == &thread_ops) return (struct thread *)grab_object( obj );
273 set_error( STATUS_INVALID_CID );
274 return NULL;
277 /* get a thread from a handle (and increment the refcount) */
278 struct thread *get_thread_from_handle( obj_handle_t handle, unsigned int access )
280 return (struct thread *)get_handle_obj( current->process, handle,
281 access, &thread_ops );
284 /* find a thread from a Unix pid */
285 struct thread *get_thread_from_pid( int pid )
287 struct thread *thread;
289 LIST_FOR_EACH_ENTRY( thread, &thread_list, struct thread, entry )
291 if (thread->unix_tid == pid) return thread;
293 LIST_FOR_EACH_ENTRY( thread, &thread_list, struct thread, entry )
295 if (thread->unix_pid == pid) return thread;
297 return NULL;
300 /* set all information about a thread */
301 static void set_thread_info( struct thread *thread,
302 const struct set_thread_info_request *req )
304 if (req->mask & SET_THREAD_INFO_PRIORITY)
305 thread->priority = req->priority;
306 if (req->mask & SET_THREAD_INFO_AFFINITY)
308 if (req->affinity != 1) set_error( STATUS_INVALID_PARAMETER );
309 else thread->affinity = req->affinity;
311 if (req->mask & SET_THREAD_INFO_TOKEN)
312 security_set_thread_token( thread, req->token );
315 /* stop a thread (at the Unix level) */
316 void stop_thread( struct thread *thread )
318 /* can't stop a thread while initialisation is in progress */
319 if (is_process_init_done(thread->process)) send_thread_signal( thread, SIGUSR1 );
322 /* suspend a thread */
323 static int suspend_thread( struct thread *thread )
325 int old_count = thread->suspend;
326 if (thread->suspend < MAXIMUM_SUSPEND_COUNT)
328 if (!(thread->process->suspend + thread->suspend++)) stop_thread( thread );
330 else set_error( STATUS_SUSPEND_COUNT_EXCEEDED );
331 return old_count;
334 /* resume a thread */
335 static int resume_thread( struct thread *thread )
337 int old_count = thread->suspend;
338 if (thread->suspend > 0)
340 if (!(--thread->suspend + thread->process->suspend)) wake_thread( thread );
342 return old_count;
345 /* add a thread to an object wait queue; return 1 if OK, 0 on error */
346 int add_queue( struct object *obj, struct wait_queue_entry *entry )
348 grab_object( obj );
349 entry->obj = obj;
350 list_add_tail( &obj->wait_queue, &entry->entry );
351 return 1;
354 /* remove a thread from an object wait queue */
355 void remove_queue( struct object *obj, struct wait_queue_entry *entry )
357 list_remove( &entry->entry );
358 release_object( obj );
361 /* finish waiting */
362 static void end_wait( struct thread *thread )
364 struct thread_wait *wait = thread->wait;
365 struct wait_queue_entry *entry;
366 int i;
368 assert( wait );
369 for (i = 0, entry = wait->queues; i < wait->count; i++, entry++)
370 entry->obj->ops->remove_queue( entry->obj, entry );
371 if (wait->user) remove_timeout_user( wait->user );
372 thread->wait = wait->next;
373 free( wait );
376 /* build the thread wait structure */
377 static int wait_on( int count, struct object *objects[], int flags, const abs_time_t *timeout )
379 struct thread_wait *wait;
380 struct wait_queue_entry *entry;
381 int i;
383 if (!(wait = mem_alloc( sizeof(*wait) + (count-1) * sizeof(*entry) ))) return 0;
384 wait->next = current->wait;
385 wait->thread = current;
386 wait->count = count;
387 wait->flags = flags;
388 wait->user = NULL;
389 current->wait = wait;
390 if (flags & SELECT_TIMEOUT)
392 wait->timeout.tv_sec = timeout->sec;
393 wait->timeout.tv_usec = timeout->usec;
396 for (i = 0, entry = wait->queues; i < count; i++, entry++)
398 struct object *obj = objects[i];
399 entry->thread = current;
400 if (!obj->ops->add_queue( obj, entry ))
402 wait->count = i;
403 end_wait( current );
404 return 0;
407 return 1;
410 /* check if the thread waiting condition is satisfied */
411 static int check_wait( struct thread *thread )
413 int i, signaled;
414 struct thread_wait *wait = thread->wait;
415 struct wait_queue_entry *entry = wait->queues;
417 /* Suspended threads may not acquire locks */
418 if (thread->process->suspend + thread->suspend > 0) return -1;
420 assert( wait );
421 if (wait->flags & SELECT_ALL)
423 int not_ok = 0;
424 /* Note: we must check them all anyway, as some objects may
425 * want to do something when signaled, even if others are not */
426 for (i = 0, entry = wait->queues; i < wait->count; i++, entry++)
427 not_ok |= !entry->obj->ops->signaled( entry->obj, thread );
428 if (not_ok) goto other_checks;
429 /* Wait satisfied: tell it to all objects */
430 signaled = 0;
431 for (i = 0, entry = wait->queues; i < wait->count; i++, entry++)
432 if (entry->obj->ops->satisfied( entry->obj, thread ))
433 signaled = STATUS_ABANDONED_WAIT_0;
434 return signaled;
436 else
438 for (i = 0, entry = wait->queues; i < wait->count; i++, entry++)
440 if (!entry->obj->ops->signaled( entry->obj, thread )) continue;
441 /* Wait satisfied: tell it to the object */
442 signaled = i;
443 if (entry->obj->ops->satisfied( entry->obj, thread ))
444 signaled = i + STATUS_ABANDONED_WAIT_0;
445 return signaled;
449 other_checks:
450 if ((wait->flags & SELECT_INTERRUPTIBLE) && !list_empty(&thread->system_apc)) return STATUS_USER_APC;
451 if ((wait->flags & SELECT_ALERTABLE) && !list_empty(&thread->user_apc)) return STATUS_USER_APC;
452 if (wait->flags & SELECT_TIMEOUT)
454 struct timeval now;
455 gettimeofday( &now, NULL );
456 if (!time_before( &now, &wait->timeout )) return STATUS_TIMEOUT;
458 return -1;
461 /* send the wakeup signal to a thread */
462 static int send_thread_wakeup( struct thread *thread, void *cookie, int signaled )
464 struct wake_up_reply reply;
465 int ret;
467 reply.cookie = cookie;
468 reply.signaled = signaled;
469 if ((ret = write( get_unix_fd( thread->wait_fd ), &reply, sizeof(reply) )) == sizeof(reply))
470 return 0;
471 if (ret >= 0)
472 fatal_protocol_error( thread, "partial wakeup write %d\n", ret );
473 else if (errno == EPIPE)
474 kill_thread( thread, 0 ); /* normal death */
475 else
476 fatal_protocol_perror( thread, "write" );
477 return -1;
480 /* attempt to wake up a thread */
481 /* return >0 if OK, 0 if the wait condition is still not satisfied */
482 int wake_thread( struct thread *thread )
484 int signaled, count;
485 void *cookie;
487 for (count = 0; thread->wait; count++)
489 if ((signaled = check_wait( thread )) == -1) break;
491 cookie = thread->wait->cookie;
492 if (debug_level) fprintf( stderr, "%04x: *wakeup* signaled=%d cookie=%p\n",
493 thread->id, signaled, cookie );
494 end_wait( thread );
495 if (send_thread_wakeup( thread, cookie, signaled ) == -1) /* error */
496 break;
498 return count;
501 /* thread wait timeout */
502 static void thread_timeout( void *ptr )
504 struct thread_wait *wait = ptr;
505 struct thread *thread = wait->thread;
506 void *cookie = wait->cookie;
508 wait->user = NULL;
509 if (thread->wait != wait) return; /* not the top-level wait, ignore it */
510 if (thread->suspend + thread->process->suspend > 0) return; /* suspended, ignore it */
512 if (debug_level) fprintf( stderr, "%04x: *wakeup* signaled=%d cookie=%p\n",
513 thread->id, STATUS_TIMEOUT, cookie );
514 end_wait( thread );
515 if (send_thread_wakeup( thread, cookie, STATUS_TIMEOUT ) == -1) return;
516 /* check if other objects have become signaled in the meantime */
517 wake_thread( thread );
520 /* try signaling an event flag, a semaphore or a mutex */
521 static int signal_object( obj_handle_t handle )
523 struct object *obj;
524 int ret = 0;
526 obj = get_handle_obj( current->process, handle, 0, NULL );
527 if (obj)
529 ret = obj->ops->signal( obj, get_handle_access( current->process, handle ));
530 release_object( obj );
532 return ret;
535 /* select on a list of handles */
536 static void select_on( int count, void *cookie, const obj_handle_t *handles,
537 int flags, const abs_time_t *timeout, obj_handle_t signal_obj )
539 int ret, i;
540 struct object *objects[MAXIMUM_WAIT_OBJECTS];
542 if ((count < 0) || (count > MAXIMUM_WAIT_OBJECTS))
544 set_error( STATUS_INVALID_PARAMETER );
545 return;
547 for (i = 0; i < count; i++)
549 if (!(objects[i] = get_handle_obj( current->process, handles[i], SYNCHRONIZE, NULL )))
550 break;
553 if (i < count) goto done;
554 if (!wait_on( count, objects, flags, timeout )) goto done;
556 /* signal the object */
557 if (signal_obj)
559 if (!signal_object( signal_obj ))
561 end_wait( current );
562 goto done;
564 /* check if we woke ourselves up */
565 if (!current->wait) goto done;
568 if ((ret = check_wait( current )) != -1)
570 /* condition is already satisfied */
571 end_wait( current );
572 set_error( ret );
573 goto done;
576 /* now we need to wait */
577 if (flags & SELECT_TIMEOUT)
579 if (!(current->wait->user = add_timeout_user( &current->wait->timeout,
580 thread_timeout, current->wait )))
582 end_wait( current );
583 goto done;
586 current->wait->cookie = cookie;
587 set_error( STATUS_PENDING );
589 done:
590 while (--i >= 0) release_object( objects[i] );
593 /* attempt to wake threads sleeping on the object wait queue */
594 void wake_up( struct object *obj, int max )
596 struct list *ptr, *next;
598 LIST_FOR_EACH_SAFE( ptr, next, &obj->wait_queue )
600 struct wait_queue_entry *entry = LIST_ENTRY( ptr, struct wait_queue_entry, entry );
601 if (wake_thread( entry->thread ))
603 if (max && !--max) break;
608 /* queue an async procedure call */
609 int thread_queue_apc( struct thread *thread, struct object *owner, void *func,
610 enum apc_type type, int system, void *arg1, void *arg2, void *arg3 )
612 struct thread_apc *apc;
613 struct list *queue = system ? &thread->system_apc : &thread->user_apc;
615 /* cancel a possible previous APC with the same owner */
616 if (owner) thread_cancel_apc( thread, owner, system );
617 if (thread->state == TERMINATED) return 0;
619 if (!(apc = mem_alloc( sizeof(*apc) ))) return 0;
620 apc->owner = owner;
621 apc->func = func;
622 apc->type = type;
623 apc->arg1 = arg1;
624 apc->arg2 = arg2;
625 apc->arg3 = arg3;
626 list_add_tail( queue, &apc->entry );
627 if (!list_prev( queue, &apc->entry )) /* first one */
628 wake_thread( thread );
630 return 1;
633 /* cancel the async procedure call owned by a specific object */
634 void thread_cancel_apc( struct thread *thread, struct object *owner, int system )
636 struct thread_apc *apc;
637 struct list *queue = system ? &thread->system_apc : &thread->user_apc;
638 LIST_FOR_EACH_ENTRY( apc, queue, struct thread_apc, entry )
640 if (apc->owner != owner) continue;
641 list_remove( &apc->entry );
642 free( apc );
643 return;
647 /* remove the head apc from the queue; the returned pointer must be freed by the caller */
648 static struct thread_apc *thread_dequeue_apc( struct thread *thread, int system_only )
650 struct thread_apc *apc = NULL;
651 struct list *ptr = list_head( &thread->system_apc );
653 if (!ptr && !system_only) ptr = list_head( &thread->user_apc );
654 if (ptr)
656 apc = LIST_ENTRY( ptr, struct thread_apc, entry );
657 list_remove( ptr );
659 return apc;
662 /* add an fd to the inflight list */
663 /* return list index, or -1 on error */
664 int thread_add_inflight_fd( struct thread *thread, int client, int server )
666 int i;
668 if (server == -1) return -1;
669 if (client == -1)
671 close( server );
672 return -1;
675 /* first check if we already have an entry for this fd */
676 for (i = 0; i < MAX_INFLIGHT_FDS; i++)
677 if (thread->inflight[i].client == client)
679 close( thread->inflight[i].server );
680 thread->inflight[i].server = server;
681 return i;
684 /* now find a free spot to store it */
685 for (i = 0; i < MAX_INFLIGHT_FDS; i++)
686 if (thread->inflight[i].client == -1)
688 thread->inflight[i].client = client;
689 thread->inflight[i].server = server;
690 return i;
692 return -1;
695 /* get an inflight fd and purge it from the list */
696 /* the fd must be closed when no longer used */
697 int thread_get_inflight_fd( struct thread *thread, int client )
699 int i, ret;
701 if (client == -1) return -1;
705 for (i = 0; i < MAX_INFLIGHT_FDS; i++)
707 if (thread->inflight[i].client == client)
709 ret = thread->inflight[i].server;
710 thread->inflight[i].server = thread->inflight[i].client = -1;
711 return ret;
714 } while (!receive_fd( thread->process )); /* in case it is still in the socket buffer */
715 return -1;
718 /* retrieve an LDT selector entry */
719 static void get_selector_entry( struct thread *thread, int entry,
720 unsigned int *base, unsigned int *limit,
721 unsigned char *flags )
723 if (!thread->process->ldt_copy)
725 set_error( STATUS_ACCESS_DENIED );
726 return;
728 if (entry >= 8192)
730 set_error( STATUS_INVALID_PARAMETER ); /* FIXME */
731 return;
733 if (suspend_for_ptrace( thread ))
735 unsigned char flags_buf[4];
736 int *addr = (int *)thread->process->ldt_copy + entry;
737 if (read_thread_int( thread, addr, (int *)base ) == -1) goto done;
738 if (read_thread_int( thread, addr + 8192, (int *)limit ) == -1) goto done;
739 addr = (int *)thread->process->ldt_copy + 2*8192 + (entry >> 2);
740 if (read_thread_int( thread, addr, (int *)flags_buf ) == -1) goto done;
741 *flags = flags_buf[entry & 3];
742 done:
743 resume_after_ptrace( thread );
747 /* kill a thread on the spot */
748 void kill_thread( struct thread *thread, int violent_death )
750 if (thread->state == TERMINATED) return; /* already killed */
751 thread->state = TERMINATED;
752 thread->exit_time = time(NULL);
753 if (current == thread) current = NULL;
754 if (debug_level)
755 fprintf( stderr,"%04x: *killed* exit_code=%d\n",
756 thread->id, thread->exit_code );
757 if (thread->wait)
759 while (thread->wait) end_wait( thread );
760 send_thread_wakeup( thread, NULL, STATUS_PENDING );
761 /* if it is waiting on the socket, we don't need to send a SIGTERM */
762 violent_death = 0;
764 kill_console_processes( thread, 0 );
765 debug_exit_thread( thread );
766 abandon_mutexes( thread );
767 wake_up( &thread->obj, 0 );
768 if (violent_death) send_thread_signal( thread, SIGTERM );
769 cleanup_thread( thread );
770 remove_process_thread( thread->process, thread );
771 release_object( thread );
774 /* take a snapshot of currently running threads */
775 struct thread_snapshot *thread_snap( int *count )
777 struct thread_snapshot *snapshot, *ptr;
778 struct thread *thread;
779 int total = 0;
781 LIST_FOR_EACH_ENTRY( thread, &thread_list, struct thread, entry )
782 if (thread->state != TERMINATED) total++;
783 if (!total || !(snapshot = mem_alloc( sizeof(*snapshot) * total ))) return NULL;
784 ptr = snapshot;
785 LIST_FOR_EACH_ENTRY( thread, &thread_list, struct thread, entry )
787 if (thread->state == TERMINATED) continue;
788 ptr->thread = thread;
789 ptr->count = thread->obj.refcount;
790 ptr->priority = thread->priority;
791 grab_object( thread );
792 ptr++;
794 *count = total;
795 return snapshot;
798 /* gets the current impersonation token */
799 struct token *thread_get_impersonation_token( struct thread *thread )
801 if (thread->token)
802 return thread->token;
803 else
804 return thread->process->token;
807 /* create a new thread */
808 DECL_HANDLER(new_thread)
810 struct thread *thread;
811 int request_fd = thread_get_inflight_fd( current, req->request_fd );
813 if (request_fd == -1 || fcntl( request_fd, F_SETFL, O_NONBLOCK ) == -1)
815 if (request_fd != -1) close( request_fd );
816 set_error( STATUS_INVALID_HANDLE );
817 return;
820 if ((thread = create_thread( request_fd, current->process )))
822 if (req->suspend) thread->suspend++;
823 reply->tid = get_thread_id( thread );
824 if ((reply->handle = alloc_handle( current->process, thread,
825 THREAD_ALL_ACCESS, req->inherit )))
827 /* thread object will be released when the thread gets killed */
828 return;
830 kill_thread( thread, 1 );
834 /* initialize a new thread */
835 DECL_HANDLER(init_thread)
837 struct process *process = current->process;
838 int reply_fd = thread_get_inflight_fd( current, req->reply_fd );
839 int wait_fd = thread_get_inflight_fd( current, req->wait_fd );
841 if (current->unix_pid != -1)
843 fatal_protocol_error( current, "init_thread: already running\n" );
844 goto error;
846 if (reply_fd == -1 || fcntl( reply_fd, F_SETFL, O_NONBLOCK ) == -1)
848 fatal_protocol_error( current, "bad reply fd\n" );
849 goto error;
851 if (wait_fd == -1)
853 fatal_protocol_error( current, "bad wait fd\n" );
854 goto error;
856 if (!(current->reply_fd = create_anonymous_fd( &thread_fd_ops, reply_fd, &current->obj )))
858 reply_fd = -1;
859 fatal_protocol_error( current, "could not allocate reply fd\n" );
860 goto error;
862 if (!(current->wait_fd = create_anonymous_fd( &thread_fd_ops, wait_fd, &current->obj )))
863 return;
865 if (!is_valid_address(req->teb) || !is_valid_address(req->peb) || !is_valid_address(req->ldt_copy))
867 set_error( STATUS_INVALID_PARAMETER );
868 return;
871 current->unix_pid = req->unix_pid;
872 current->unix_tid = req->unix_tid;
873 current->teb = req->teb;
875 if (!process->peb) /* first thread, initialize the process too */
877 process->peb = req->peb;
878 process->ldt_copy = req->ldt_copy;
879 reply->info_size = init_process( current );
881 else
883 if (current->suspend + process->suspend > 0) stop_thread( current );
884 generate_debug_event( current, CREATE_THREAD_DEBUG_EVENT, req->entry );
886 debug_level = max( debug_level, req->debug_level );
888 reply->pid = get_process_id( process );
889 reply->tid = get_thread_id( current );
890 reply->version = SERVER_PROTOCOL_VERSION;
891 reply->server_start = server_start_time;
892 return;
894 error:
895 if (reply_fd != -1) close( reply_fd );
896 if (wait_fd != -1) close( wait_fd );
899 /* terminate a thread */
900 DECL_HANDLER(terminate_thread)
902 struct thread *thread;
904 reply->self = 0;
905 reply->last = 0;
906 if ((thread = get_thread_from_handle( req->handle, THREAD_TERMINATE )))
908 thread->exit_code = req->exit_code;
909 if (thread != current) kill_thread( thread, 1 );
910 else
912 reply->self = 1;
913 reply->last = (thread->process->running_threads == 1);
915 release_object( thread );
919 /* open a handle to a thread */
920 DECL_HANDLER(open_thread)
922 struct thread *thread = get_thread_from_id( req->tid );
924 reply->handle = 0;
925 if (thread)
927 reply->handle = alloc_handle( current->process, thread, req->access, req->inherit );
928 release_object( thread );
932 /* fetch information about a thread */
933 DECL_HANDLER(get_thread_info)
935 struct thread *thread;
936 obj_handle_t handle = req->handle;
938 if (!handle) thread = get_thread_from_id( req->tid_in );
939 else thread = get_thread_from_handle( req->handle, THREAD_QUERY_INFORMATION );
941 if (thread)
943 reply->pid = get_process_id( thread->process );
944 reply->tid = get_thread_id( thread );
945 reply->teb = thread->teb;
946 reply->exit_code = (thread->state == TERMINATED) ? thread->exit_code : STILL_ACTIVE;
947 reply->priority = thread->priority;
948 reply->affinity = thread->affinity;
949 reply->creation_time = thread->creation_time;
950 reply->exit_time = thread->exit_time;
952 release_object( thread );
956 /* set information about a thread */
957 DECL_HANDLER(set_thread_info)
959 struct thread *thread;
961 if ((thread = get_thread_from_handle( req->handle, THREAD_SET_INFORMATION )))
963 set_thread_info( thread, req );
964 release_object( thread );
968 /* suspend a thread */
969 DECL_HANDLER(suspend_thread)
971 struct thread *thread;
973 if ((thread = get_thread_from_handle( req->handle, THREAD_SUSPEND_RESUME )))
975 if (thread->state == TERMINATED) set_error( STATUS_ACCESS_DENIED );
976 else reply->count = suspend_thread( thread );
977 release_object( thread );
981 /* resume a thread */
982 DECL_HANDLER(resume_thread)
984 struct thread *thread;
986 if ((thread = get_thread_from_handle( req->handle, THREAD_SUSPEND_RESUME )))
988 if (thread->state == TERMINATED) set_error( STATUS_ACCESS_DENIED );
989 else reply->count = resume_thread( thread );
990 release_object( thread );
994 /* select on a handle list */
995 DECL_HANDLER(select)
997 int count = get_req_data_size() / sizeof(int);
998 select_on( count, req->cookie, get_req_data(), req->flags, &req->timeout, req->signal );
1001 /* queue an APC for a thread */
1002 DECL_HANDLER(queue_apc)
1004 struct thread *thread;
1005 if ((thread = get_thread_from_handle( req->handle, THREAD_SET_CONTEXT )))
1007 thread_queue_apc( thread, NULL, req->func, APC_USER, !req->user,
1008 req->arg1, req->arg2, req->arg3 );
1009 release_object( thread );
1013 /* get next APC to call */
1014 DECL_HANDLER(get_apc)
1016 struct thread_apc *apc;
1018 for (;;)
1020 if (!(apc = thread_dequeue_apc( current, !req->alertable )))
1022 /* no more APCs */
1023 reply->func = NULL;
1024 reply->type = APC_NONE;
1025 return;
1027 /* Optimization: ignore APCs that have a NULL func; they are only used
1028 * to wake up a thread, but since we got here the thread woke up already.
1029 * Exception: for APC_ASYNC_IO, func == NULL is legal.
1031 if (apc->func || apc->type == APC_ASYNC_IO) break;
1032 free( apc );
1034 reply->func = apc->func;
1035 reply->type = apc->type;
1036 reply->arg1 = apc->arg1;
1037 reply->arg2 = apc->arg2;
1038 reply->arg3 = apc->arg3;
1039 free( apc );
1042 /* fetch a selector entry for a thread */
1043 DECL_HANDLER(get_selector_entry)
1045 struct thread *thread;
1046 if ((thread = get_thread_from_handle( req->handle, THREAD_QUERY_INFORMATION )))
1048 get_selector_entry( thread, req->entry, &reply->base, &reply->limit, &reply->flags );
1049 release_object( thread );