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bd99dc85 | 1 | /* Event loop machinery for the remote server for GDB. |
28e7fd62 | 2 | Copyright (C) 1999-2013 Free Software Foundation, Inc. |
bd99dc85 PA |
3 | |
4 | This file is part of GDB. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 3 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program 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 | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
18 | ||
19 | /* Based on src/gdb/event-loop.c. */ | |
20 | ||
21 | #include "server.h" | |
22 | ||
23 | #include <sys/types.h> | |
24 | #include <string.h> | |
25 | #include <sys/time.h> | |
26 | ||
27 | #ifdef USE_WIN32API | |
28 | #include <windows.h> | |
29 | #include <io.h> | |
30 | #endif | |
31 | ||
32 | #ifdef HAVE_ERRNO_H | |
33 | #include <errno.h> | |
34 | #endif | |
35 | ||
e9464885 DE |
36 | #ifdef HAVE_UNISTD_H |
37 | #include <unistd.h> | |
38 | #endif | |
39 | ||
bd99dc85 | 40 | typedef struct gdb_event gdb_event; |
ec48365d | 41 | typedef int (event_handler_func) (gdb_fildes_t); |
bd99dc85 PA |
42 | |
43 | /* Tell create_file_handler what events we are interested in. */ | |
44 | ||
45 | #define GDB_READABLE (1<<1) | |
46 | #define GDB_WRITABLE (1<<2) | |
47 | #define GDB_EXCEPTION (1<<3) | |
48 | ||
49 | /* Events are queued by calling async_queue_event and serviced later | |
50 | on by do_one_event. An event can be, for instance, a file | |
51 | descriptor becoming ready to be read. Servicing an event simply | |
52 | means that the procedure PROC will be called. We have 2 queues, | |
53 | one for file handlers that we listen to in the event loop, and one | |
54 | for the file handlers+events that are ready. The procedure PROC | |
55 | associated with each event is always the same (handle_file_event). | |
56 | Its duty is to invoke the handler associated with the file | |
57 | descriptor whose state change generated the event, plus doing other | |
58 | cleanups and such. */ | |
59 | ||
60 | struct gdb_event | |
61 | { | |
62 | /* Procedure to call to service this event. */ | |
63 | event_handler_func *proc; | |
64 | ||
65 | /* File descriptor that is ready. */ | |
ec48365d | 66 | gdb_fildes_t fd; |
bd99dc85 PA |
67 | |
68 | /* Next in list of events or NULL. */ | |
69 | struct gdb_event *next_event; | |
70 | }; | |
71 | ||
72 | /* Information about each file descriptor we register with the event | |
73 | loop. */ | |
74 | ||
75 | typedef struct file_handler | |
76 | { | |
77 | /* File descriptor. */ | |
ec48365d | 78 | gdb_fildes_t fd; |
bd99dc85 PA |
79 | |
80 | /* Events we want to monitor. */ | |
81 | int mask; | |
82 | ||
83 | /* Events that have been seen since the last time. */ | |
84 | int ready_mask; | |
85 | ||
86 | /* Procedure to call when fd is ready. */ | |
87 | handler_func *proc; | |
88 | ||
89 | /* Argument to pass to proc. */ | |
90 | gdb_client_data client_data; | |
91 | ||
92 | /* Was an error detected on this fd? */ | |
93 | int error; | |
94 | ||
95 | /* Next registered file descriptor. */ | |
96 | struct file_handler *next_file; | |
97 | } | |
98 | file_handler; | |
99 | ||
100 | /* Event queue: | |
101 | ||
102 | Events can be inserted at the front of the queue or at the end of | |
103 | the queue. Events will be extracted from the queue for processing | |
104 | starting from the head. Therefore, events inserted at the head of | |
105 | the queue will be processed in a last in first out fashion, while | |
106 | those inserted at the tail of the queue will be processed in a | |
107 | first in first out manner. All the fields are NULL if the queue is | |
108 | empty. */ | |
109 | ||
110 | static struct | |
111 | { | |
112 | /* The first pending event. */ | |
113 | gdb_event *first_event; | |
114 | ||
115 | /* The last pending event. */ | |
116 | gdb_event *last_event; | |
117 | } | |
118 | event_queue; | |
119 | ||
120 | /* Gdb_notifier is just a list of file descriptors gdb is interested | |
121 | in. These are the input file descriptor, and the target file | |
122 | descriptor. Each of the elements in the gdb_notifier list is | |
123 | basically a description of what kind of events gdb is interested | |
124 | in, for each fd. */ | |
125 | ||
126 | static struct | |
127 | { | |
128 | /* Ptr to head of file handler list. */ | |
129 | file_handler *first_file_handler; | |
130 | ||
131 | /* Masks to be used in the next call to select. Bits are set in | |
132 | response to calls to create_file_handler. */ | |
133 | fd_set check_masks[3]; | |
134 | ||
135 | /* What file descriptors were found ready by select. */ | |
136 | fd_set ready_masks[3]; | |
137 | ||
138 | /* Number of valid bits (highest fd value + 1). (for select) */ | |
139 | int num_fds; | |
140 | } | |
141 | gdb_notifier; | |
142 | ||
24b066ba DE |
143 | /* Callbacks are just routines that are executed before waiting for the |
144 | next event. In GDB this is struct gdb_timer. We don't need timers | |
145 | so rather than copy all that complexity in gdbserver, we provide what | |
146 | we need, but we do so in a way that if/when the day comes that we need | |
147 | that complexity, it'll be easier to add - replace callbacks with timers | |
148 | and use a delta of zero (which is all gdb currently uses timers for anyway). | |
149 | ||
150 | PROC will be executed before gdbserver goes to sleep to wait for the | |
151 | next event. */ | |
152 | ||
153 | struct callback_event | |
154 | { | |
155 | int id; | |
156 | callback_handler_func *proc; | |
157 | gdb_client_data *data; | |
158 | struct callback_event *next; | |
159 | }; | |
160 | ||
161 | /* Table of registered callbacks. */ | |
162 | ||
163 | static struct | |
164 | { | |
165 | struct callback_event *first; | |
166 | struct callback_event *last; | |
167 | ||
168 | /* Id of the last callback created. */ | |
169 | int num_callbacks; | |
170 | } | |
171 | callback_list; | |
172 | ||
bd99dc85 PA |
173 | /* Insert an event object into the gdb event queue. |
174 | ||
175 | EVENT_PTR points to the event to be inserted into the queue. The | |
176 | caller must allocate memory for the event. It is freed after the | |
177 | event has ben handled. Events in the queue will be processed head | |
178 | to tail, therefore, events will be processed first in first | |
179 | out. */ | |
180 | ||
181 | static void | |
182 | async_queue_event (gdb_event *event_ptr) | |
183 | { | |
184 | /* The event will become the new last_event. */ | |
185 | ||
186 | event_ptr->next_event = NULL; | |
187 | if (event_queue.first_event == NULL) | |
188 | event_queue.first_event = event_ptr; | |
189 | else | |
190 | event_queue.last_event->next_event = event_ptr; | |
191 | event_queue.last_event = event_ptr; | |
192 | } | |
193 | ||
194 | /* Process one event. If an event was processed, 1 is returned | |
195 | otherwise 0 is returned. Scan the queue from head to tail, | |
196 | processing therefore the high priority events first, by invoking | |
197 | the associated event handler procedure. */ | |
198 | ||
199 | static int | |
200 | process_event (void) | |
201 | { | |
202 | gdb_event *event_ptr, *prev_ptr; | |
203 | event_handler_func *proc; | |
ec48365d | 204 | gdb_fildes_t fd; |
bd99dc85 PA |
205 | |
206 | /* Look in the event queue to find an event that is ready | |
207 | to be processed. */ | |
208 | ||
209 | for (event_ptr = event_queue.first_event; | |
210 | event_ptr != NULL; | |
211 | event_ptr = event_ptr->next_event) | |
212 | { | |
213 | /* Call the handler for the event. */ | |
214 | ||
215 | proc = event_ptr->proc; | |
216 | fd = event_ptr->fd; | |
217 | ||
218 | /* Let's get rid of the event from the event queue. We need to | |
219 | do this now because while processing the event, since the | |
220 | proc function could end up jumping out to the caller of this | |
221 | function. In that case, we would have on the event queue an | |
222 | event which has been processed, but not deleted. */ | |
223 | ||
224 | if (event_queue.first_event == event_ptr) | |
225 | { | |
226 | event_queue.first_event = event_ptr->next_event; | |
227 | if (event_ptr->next_event == NULL) | |
228 | event_queue.last_event = NULL; | |
229 | } | |
230 | else | |
231 | { | |
232 | prev_ptr = event_queue.first_event; | |
233 | while (prev_ptr->next_event != event_ptr) | |
234 | prev_ptr = prev_ptr->next_event; | |
235 | ||
236 | prev_ptr->next_event = event_ptr->next_event; | |
237 | if (event_ptr->next_event == NULL) | |
238 | event_queue.last_event = prev_ptr; | |
239 | } | |
240 | free (event_ptr); | |
241 | ||
242 | /* Now call the procedure associated with the event. */ | |
8336d594 PA |
243 | if ((*proc) (fd)) |
244 | return -1; | |
bd99dc85 PA |
245 | return 1; |
246 | } | |
247 | ||
248 | /* This is the case if there are no event on the event queue. */ | |
249 | return 0; | |
250 | } | |
251 | ||
24b066ba DE |
252 | /* Append PROC to the callback list. |
253 | The result is the "id" of the callback that can be passed back to | |
254 | delete_callback_event. */ | |
255 | ||
256 | int | |
257 | append_callback_event (callback_handler_func *proc, gdb_client_data data) | |
258 | { | |
259 | struct callback_event *event_ptr; | |
260 | ||
261 | event_ptr = xmalloc (sizeof (*event_ptr)); | |
262 | event_ptr->id = callback_list.num_callbacks++; | |
263 | event_ptr->proc = proc; | |
264 | event_ptr->data = data; | |
265 | event_ptr->next = NULL; | |
266 | if (callback_list.first == NULL) | |
267 | callback_list.first = event_ptr; | |
268 | if (callback_list.last != NULL) | |
269 | callback_list.last->next = event_ptr; | |
270 | callback_list.last = event_ptr; | |
271 | return event_ptr->id; | |
272 | } | |
273 | ||
274 | /* Delete callback ID. | |
275 | It is not an error callback ID doesn't exist. */ | |
276 | ||
277 | void | |
278 | delete_callback_event (int id) | |
279 | { | |
280 | struct callback_event **p; | |
281 | ||
282 | for (p = &callback_list.first; *p != NULL; p = &(*p)->next) | |
283 | { | |
284 | struct callback_event *event_ptr = *p; | |
285 | ||
286 | if (event_ptr->id == id) | |
287 | { | |
288 | *p = event_ptr->next; | |
289 | if (event_ptr == callback_list.last) | |
290 | callback_list.last = NULL; | |
291 | free (event_ptr); | |
292 | break; | |
293 | } | |
294 | } | |
295 | } | |
296 | ||
297 | /* Run the next callback. | |
298 | The result is 1 if a callback was called and event processing | |
299 | should continue, -1 if the callback wants the event loop to exit, | |
300 | and 0 if there are no more callbacks. */ | |
301 | ||
302 | static int | |
303 | process_callback (void) | |
304 | { | |
305 | struct callback_event *event_ptr; | |
306 | ||
307 | event_ptr = callback_list.first; | |
308 | if (event_ptr != NULL) | |
309 | { | |
310 | callback_handler_func *proc = event_ptr->proc; | |
311 | gdb_client_data *data = event_ptr->data; | |
312 | ||
313 | /* Remove the event before calling PROC, | |
314 | more events may get added by PROC. */ | |
315 | callback_list.first = event_ptr->next; | |
316 | if (callback_list.first == NULL) | |
317 | callback_list.last = NULL; | |
318 | free (event_ptr); | |
319 | if ((*proc) (data)) | |
320 | return -1; | |
321 | return 1; | |
322 | } | |
323 | ||
324 | return 0; | |
325 | } | |
326 | ||
bd99dc85 PA |
327 | /* Add a file handler/descriptor to the list of descriptors we are |
328 | interested in. FD is the file descriptor for the file/stream to be | |
329 | listened to. MASK is a combination of READABLE, WRITABLE, | |
330 | EXCEPTION. PROC is the procedure that will be called when an event | |
331 | occurs for FD. CLIENT_DATA is the argument to pass to PROC. */ | |
332 | ||
333 | static void | |
ec48365d | 334 | create_file_handler (gdb_fildes_t fd, int mask, handler_func *proc, |
bd99dc85 PA |
335 | gdb_client_data client_data) |
336 | { | |
337 | file_handler *file_ptr; | |
338 | ||
339 | /* Do we already have a file handler for this file? (We may be | |
340 | changing its associated procedure). */ | |
341 | for (file_ptr = gdb_notifier.first_file_handler; | |
342 | file_ptr != NULL; | |
343 | file_ptr = file_ptr->next_file) | |
344 | if (file_ptr->fd == fd) | |
345 | break; | |
346 | ||
347 | /* It is a new file descriptor. Add it to the list. Otherwise, | |
348 | just change the data associated with it. */ | |
349 | if (file_ptr == NULL) | |
350 | { | |
351 | file_ptr = xmalloc (sizeof (*file_ptr)); | |
352 | file_ptr->fd = fd; | |
353 | file_ptr->ready_mask = 0; | |
354 | file_ptr->next_file = gdb_notifier.first_file_handler; | |
355 | gdb_notifier.first_file_handler = file_ptr; | |
356 | ||
357 | if (mask & GDB_READABLE) | |
358 | FD_SET (fd, &gdb_notifier.check_masks[0]); | |
359 | else | |
360 | FD_CLR (fd, &gdb_notifier.check_masks[0]); | |
361 | ||
362 | if (mask & GDB_WRITABLE) | |
363 | FD_SET (fd, &gdb_notifier.check_masks[1]); | |
364 | else | |
365 | FD_CLR (fd, &gdb_notifier.check_masks[1]); | |
366 | ||
367 | if (mask & GDB_EXCEPTION) | |
368 | FD_SET (fd, &gdb_notifier.check_masks[2]); | |
369 | else | |
370 | FD_CLR (fd, &gdb_notifier.check_masks[2]); | |
371 | ||
372 | if (gdb_notifier.num_fds <= fd) | |
373 | gdb_notifier.num_fds = fd + 1; | |
374 | } | |
375 | ||
376 | file_ptr->proc = proc; | |
377 | file_ptr->client_data = client_data; | |
378 | file_ptr->mask = mask; | |
379 | } | |
380 | ||
381 | /* Wrapper function for create_file_handler. */ | |
382 | ||
383 | void | |
ec48365d PA |
384 | add_file_handler (gdb_fildes_t fd, |
385 | handler_func *proc, gdb_client_data client_data) | |
bd99dc85 PA |
386 | { |
387 | create_file_handler (fd, GDB_READABLE | GDB_EXCEPTION, proc, client_data); | |
388 | } | |
389 | ||
390 | /* Remove the file descriptor FD from the list of monitored fd's: | |
391 | i.e. we don't care anymore about events on the FD. */ | |
392 | ||
393 | void | |
ec48365d | 394 | delete_file_handler (gdb_fildes_t fd) |
bd99dc85 PA |
395 | { |
396 | file_handler *file_ptr, *prev_ptr = NULL; | |
397 | int i; | |
398 | ||
399 | /* Find the entry for the given file. */ | |
400 | ||
401 | for (file_ptr = gdb_notifier.first_file_handler; | |
402 | file_ptr != NULL; | |
403 | file_ptr = file_ptr->next_file) | |
404 | if (file_ptr->fd == fd) | |
405 | break; | |
406 | ||
407 | if (file_ptr == NULL) | |
408 | return; | |
409 | ||
410 | if (file_ptr->mask & GDB_READABLE) | |
411 | FD_CLR (fd, &gdb_notifier.check_masks[0]); | |
412 | if (file_ptr->mask & GDB_WRITABLE) | |
413 | FD_CLR (fd, &gdb_notifier.check_masks[1]); | |
414 | if (file_ptr->mask & GDB_EXCEPTION) | |
415 | FD_CLR (fd, &gdb_notifier.check_masks[2]); | |
416 | ||
417 | /* Find current max fd. */ | |
418 | ||
419 | if ((fd + 1) == gdb_notifier.num_fds) | |
420 | { | |
421 | gdb_notifier.num_fds--; | |
422 | for (i = gdb_notifier.num_fds; i; i--) | |
423 | { | |
424 | if (FD_ISSET (i - 1, &gdb_notifier.check_masks[0]) | |
425 | || FD_ISSET (i - 1, &gdb_notifier.check_masks[1]) | |
426 | || FD_ISSET (i - 1, &gdb_notifier.check_masks[2])) | |
427 | break; | |
428 | } | |
429 | gdb_notifier.num_fds = i; | |
430 | } | |
431 | ||
432 | /* Deactivate the file descriptor, by clearing its mask, so that it | |
433 | will not fire again. */ | |
434 | ||
435 | file_ptr->mask = 0; | |
436 | ||
437 | /* Get rid of the file handler in the file handler list. */ | |
438 | if (file_ptr == gdb_notifier.first_file_handler) | |
439 | gdb_notifier.first_file_handler = file_ptr->next_file; | |
440 | else | |
441 | { | |
442 | for (prev_ptr = gdb_notifier.first_file_handler; | |
443 | prev_ptr->next_file != file_ptr; | |
444 | prev_ptr = prev_ptr->next_file) | |
445 | ; | |
446 | prev_ptr->next_file = file_ptr->next_file; | |
447 | } | |
448 | free (file_ptr); | |
449 | } | |
450 | ||
451 | /* Handle the given event by calling the procedure associated to the | |
452 | corresponding file handler. Called by process_event indirectly, | |
453 | through event_ptr->proc. EVENT_FILE_DESC is file descriptor of the | |
454 | event in the front of the event queue. */ | |
455 | ||
8336d594 | 456 | static int |
ec48365d | 457 | handle_file_event (gdb_fildes_t event_file_desc) |
bd99dc85 PA |
458 | { |
459 | file_handler *file_ptr; | |
460 | int mask; | |
461 | ||
462 | /* Search the file handler list to find one that matches the fd in | |
463 | the event. */ | |
464 | for (file_ptr = gdb_notifier.first_file_handler; file_ptr != NULL; | |
465 | file_ptr = file_ptr->next_file) | |
466 | { | |
467 | if (file_ptr->fd == event_file_desc) | |
468 | { | |
469 | /* See if the desired events (mask) match the received | |
470 | events (ready_mask). */ | |
471 | ||
472 | if (file_ptr->ready_mask & GDB_EXCEPTION) | |
473 | { | |
ec48365d PA |
474 | fprintf (stderr, "Exception condition detected on fd %s\n", |
475 | pfildes (file_ptr->fd)); | |
bd99dc85 PA |
476 | file_ptr->error = 1; |
477 | } | |
478 | else | |
479 | file_ptr->error = 0; | |
480 | mask = file_ptr->ready_mask & file_ptr->mask; | |
481 | ||
482 | /* Clear the received events for next time around. */ | |
483 | file_ptr->ready_mask = 0; | |
484 | ||
485 | /* If there was a match, then call the handler. */ | |
486 | if (mask != 0) | |
8336d594 PA |
487 | { |
488 | if ((*file_ptr->proc) (file_ptr->error, | |
489 | file_ptr->client_data) < 0) | |
490 | return -1; | |
491 | } | |
bd99dc85 PA |
492 | break; |
493 | } | |
494 | } | |
8336d594 PA |
495 | |
496 | return 0; | |
bd99dc85 PA |
497 | } |
498 | ||
499 | /* Create a file event, to be enqueued in the event queue for | |
500 | processing. The procedure associated to this event is always | |
501 | handle_file_event, which will in turn invoke the one that was | |
502 | associated to FD when it was registered with the event loop. */ | |
503 | ||
504 | static gdb_event * | |
ec48365d | 505 | create_file_event (gdb_fildes_t fd) |
bd99dc85 PA |
506 | { |
507 | gdb_event *file_event_ptr; | |
508 | ||
509 | file_event_ptr = xmalloc (sizeof (gdb_event)); | |
510 | file_event_ptr->proc = handle_file_event; | |
511 | file_event_ptr->fd = fd; | |
512 | return file_event_ptr; | |
513 | } | |
514 | ||
515 | /* Called by do_one_event to wait for new events on the monitored file | |
516 | descriptors. Queue file events as they are detected by the poll. | |
517 | If there are no events, this function will block in the call to | |
518 | select. Return -1 if there are no files descriptors to monitor, | |
519 | otherwise return 0. */ | |
520 | ||
521 | static int | |
522 | wait_for_event (void) | |
523 | { | |
524 | file_handler *file_ptr; | |
525 | gdb_event *file_event_ptr; | |
526 | int num_found = 0; | |
527 | ||
528 | /* Make sure all output is done before getting another event. */ | |
529 | fflush (stdout); | |
530 | fflush (stderr); | |
531 | ||
532 | if (gdb_notifier.num_fds == 0) | |
533 | return -1; | |
534 | ||
535 | gdb_notifier.ready_masks[0] = gdb_notifier.check_masks[0]; | |
536 | gdb_notifier.ready_masks[1] = gdb_notifier.check_masks[1]; | |
537 | gdb_notifier.ready_masks[2] = gdb_notifier.check_masks[2]; | |
538 | num_found = select (gdb_notifier.num_fds, | |
539 | &gdb_notifier.ready_masks[0], | |
540 | &gdb_notifier.ready_masks[1], | |
541 | &gdb_notifier.ready_masks[2], | |
542 | NULL); | |
543 | ||
544 | /* Clear the masks after an error from select. */ | |
545 | if (num_found == -1) | |
546 | { | |
547 | FD_ZERO (&gdb_notifier.ready_masks[0]); | |
548 | FD_ZERO (&gdb_notifier.ready_masks[1]); | |
549 | FD_ZERO (&gdb_notifier.ready_masks[2]); | |
550 | #ifdef EINTR | |
551 | /* Dont print anything if we got a signal, let gdb handle | |
552 | it. */ | |
553 | if (errno != EINTR) | |
554 | perror_with_name ("select"); | |
555 | #endif | |
556 | } | |
557 | ||
558 | /* Enqueue all detected file events. */ | |
559 | ||
560 | for (file_ptr = gdb_notifier.first_file_handler; | |
561 | file_ptr != NULL && num_found > 0; | |
562 | file_ptr = file_ptr->next_file) | |
563 | { | |
564 | int mask = 0; | |
565 | ||
566 | if (FD_ISSET (file_ptr->fd, &gdb_notifier.ready_masks[0])) | |
567 | mask |= GDB_READABLE; | |
568 | if (FD_ISSET (file_ptr->fd, &gdb_notifier.ready_masks[1])) | |
569 | mask |= GDB_WRITABLE; | |
570 | if (FD_ISSET (file_ptr->fd, &gdb_notifier.ready_masks[2])) | |
571 | mask |= GDB_EXCEPTION; | |
572 | ||
573 | if (!mask) | |
574 | continue; | |
575 | else | |
576 | num_found--; | |
577 | ||
578 | /* Enqueue an event only if this is still a new event for this | |
579 | fd. */ | |
580 | ||
581 | if (file_ptr->ready_mask == 0) | |
582 | { | |
583 | file_event_ptr = create_file_event (file_ptr->fd); | |
584 | async_queue_event (file_event_ptr); | |
585 | } | |
586 | file_ptr->ready_mask = mask; | |
587 | } | |
588 | ||
589 | return 0; | |
590 | } | |
591 | ||
592 | /* Start up the event loop. This is the entry point to the event | |
593 | loop. */ | |
594 | ||
595 | void | |
596 | start_event_loop (void) | |
597 | { | |
598 | /* Loop until there is nothing to do. This is the entry point to | |
599 | the event loop engine. If nothing is ready at this time, wait | |
600 | for something to happen (via wait_for_event), then process it. | |
601 | Return when there are no longer event sources to wait for. */ | |
602 | ||
603 | while (1) | |
604 | { | |
605 | /* Any events already waiting in the queue? */ | |
8336d594 PA |
606 | int res = process_event (); |
607 | ||
608 | /* Did the event handler want the event loop to stop? */ | |
609 | if (res == -1) | |
610 | return; | |
611 | ||
612 | if (res) | |
bd99dc85 PA |
613 | continue; |
614 | ||
24b066ba DE |
615 | /* Process any queued callbacks before we go to sleep. */ |
616 | res = process_callback (); | |
617 | ||
618 | /* Did the callback want the event loop to stop? */ | |
619 | if (res == -1) | |
620 | return; | |
621 | ||
622 | if (res) | |
623 | continue; | |
624 | ||
bd99dc85 PA |
625 | /* Wait for a new event. If wait_for_event returns -1, we |
626 | should get out because this means that there are no event | |
627 | sources left. This will make the event loop stop, and the | |
628 | application exit. */ | |
629 | ||
630 | if (wait_for_event () < 0) | |
631 | return; | |
632 | } | |
633 | ||
634 | /* We are done with the event loop. There are no more event sources | |
635 | to listen to. So we exit gdbserver. */ | |
636 | } |