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b5a0ac70 | 1 | /* Event loop machinery for GDB, the GNU debugger. |
b6ba6518 | 2 | Copyright 1999, 2000, 2001 Free Software Foundation, Inc. |
b5a0ac70 SS |
3 | Written by Elena Zannoni <ezannoni@cygnus.com> of Cygnus Solutions. |
4 | ||
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program; if not, write to the Free Software | |
c5aa993b JM |
19 | Foundation, Inc., 59 Temple Place - Suite 330, |
20 | Boston, MA 02111-1307, USA. */ | |
b5a0ac70 | 21 | |
b5a0ac70 | 22 | #include "defs.h" |
9e0b60a8 | 23 | #include "event-loop.h" |
c2c6d25f | 24 | #include "event-top.h" |
409a3f64 | 25 | |
b5a0ac70 | 26 | #ifdef HAVE_POLL |
409a3f64 | 27 | #if defined (HAVE_POLL_H) |
9e0b60a8 | 28 | #include <poll.h> |
409a3f64 AC |
29 | #elif defined (HAVE_SYS_POLL_H) |
30 | #include <sys/poll.h> | |
31 | #endif | |
44f45770 | 32 | #endif |
409a3f64 | 33 | |
9e0b60a8 | 34 | #include <sys/types.h> |
27b82ed2 | 35 | #include "gdb_string.h" |
b5a0ac70 | 36 | #include <errno.h> |
c2c6d25f JM |
37 | #include <sys/time.h> |
38 | ||
c2c6d25f JM |
39 | typedef struct gdb_event gdb_event; |
40 | typedef void (event_handler_func) (int); | |
41 | ||
42 | /* Event for the GDB event system. Events are queued by calling | |
43 | async_queue_event and serviced later on by gdb_do_one_event. An | |
44 | event can be, for instance, a file descriptor becoming ready to be | |
45 | read. Servicing an event simply means that the procedure PROC will | |
46 | be called. We have 2 queues, one for file handlers that we listen | |
47 | to in the event loop, and one for the file handlers+events that are | |
48 | ready. The procedure PROC associated with each event is always the | |
49 | same (handle_file_event). Its duty is to invoke the handler | |
50 | associated with the file descriptor whose state change generated | |
fd0e48ca | 51 | the event, plus doing other cleanups and such. */ |
c2c6d25f JM |
52 | |
53 | struct gdb_event | |
54 | { | |
55 | event_handler_func *proc; /* Procedure to call to service this event. */ | |
56 | int fd; /* File descriptor that is ready. */ | |
57 | struct gdb_event *next_event; /* Next in list of events or NULL. */ | |
58 | }; | |
59 | ||
60 | /* Information about each file descriptor we register with the event | |
61 | loop. */ | |
62 | ||
63 | typedef struct file_handler | |
64 | { | |
65 | int fd; /* File descriptor. */ | |
66 | int mask; /* Events we want to monitor: POLLIN, etc. */ | |
67 | int ready_mask; /* Events that have been seen since | |
68 | the last time. */ | |
6426a772 | 69 | handler_func *proc; /* Procedure to call when fd is ready. */ |
c2c6d25f | 70 | gdb_client_data client_data; /* Argument to pass to proc. */ |
6426a772 | 71 | int error; /* Was an error detected on this fd? */ |
c2c6d25f JM |
72 | struct file_handler *next_file; /* Next registered file descriptor. */ |
73 | } | |
74 | file_handler; | |
75 | ||
76 | /* PROC is a function to be invoked when the READY flag is set. This | |
77 | happens when there has been a signal and the corresponding signal | |
78 | handler has 'triggered' this async_signal_handler for | |
79 | execution. The actual work to be done in response to a signal will | |
80 | be carried out by PROC at a later time, within process_event. This | |
81 | provides a deferred execution of signal handlers. | |
82 | Async_init_signals takes care of setting up such an | |
83 | asyn_signal_handler for each interesting signal. */ | |
84 | typedef struct async_signal_handler | |
85 | { | |
86 | int ready; /* If ready, call this handler from the main event loop, | |
87 | using invoke_async_handler. */ | |
88 | struct async_signal_handler *next_handler; /* Ptr to next handler */ | |
6426a772 | 89 | sig_handler_func *proc; /* Function to call to do the work */ |
c2c6d25f JM |
90 | gdb_client_data client_data; /* Argument to async_handler_func */ |
91 | } | |
92 | async_signal_handler; | |
93 | ||
b5a0ac70 SS |
94 | |
95 | /* Event queue: | |
96 | - the first event in the queue is the head of the queue. | |
97 | It will be the next to be serviced. | |
98 | - the last event in the queue | |
99 | ||
100 | Events can be inserted at the front of the queue or at the end of | |
101 | the queue. Events will be extracted from the queue for processing | |
102 | starting from the head. Therefore, events inserted at the head of | |
adf40b2e | 103 | the queue will be processed in a last in first out fashion, while |
b5a0ac70 SS |
104 | those inserted at the tail of the queue will be processed in a first |
105 | in first out manner. All the fields are NULL if the queue is | |
106 | empty. */ | |
107 | ||
108 | static struct | |
109 | { | |
110 | gdb_event *first_event; /* First pending event */ | |
111 | gdb_event *last_event; /* Last pending event */ | |
112 | } | |
113 | event_queue; | |
114 | ||
115 | /* Gdb_notifier is just a list of file descriptors gdb is interested in. | |
116 | These are the input file descriptor, and the target file | |
117 | descriptor. We have two flavors of the notifier, one for platforms | |
118 | that have the POLL function, the other for those that don't, and | |
119 | only support SELECT. Each of the elements in the gdb_notifier list is | |
120 | basically a description of what kind of events gdb is interested | |
121 | in, for each fd. */ | |
122 | ||
392a587b | 123 | /* As of 1999-04-30 only the input file descriptor is registered with the |
b5a0ac70 SS |
124 | event loop. */ |
125 | ||
44f45770 | 126 | /* Do we use poll or select ? */ |
b5a0ac70 | 127 | #ifdef HAVE_POLL |
44f45770 EZ |
128 | #define USE_POLL 1 |
129 | #else | |
130 | #define USE_POLL 0 | |
131 | #endif /* HAVE_POLL */ | |
132 | ||
133 | static unsigned char use_poll = USE_POLL; | |
b5a0ac70 SS |
134 | |
135 | static struct | |
136 | { | |
137 | /* Ptr to head of file handler list. */ | |
138 | file_handler *first_file_handler; | |
139 | ||
44f45770 | 140 | #ifdef HAVE_POLL |
b5a0ac70 SS |
141 | /* Ptr to array of pollfd structures. */ |
142 | struct pollfd *poll_fds; | |
143 | ||
c2c6d25f | 144 | /* Timeout in milliseconds for calls to poll(). */ |
44f45770 EZ |
145 | int poll_timeout; |
146 | #endif | |
b5a0ac70 SS |
147 | |
148 | /* Masks to be used in the next call to select. | |
149 | Bits are set in response to calls to create_file_handler. */ | |
58a2c44a | 150 | fd_set check_masks[3]; |
b5a0ac70 SS |
151 | |
152 | /* What file descriptors were found ready by select. */ | |
58a2c44a | 153 | fd_set ready_masks[3]; |
b5a0ac70 | 154 | |
44f45770 EZ |
155 | /* Number of file descriptors to monitor. (for poll) */ |
156 | /* Number of valid bits (highest fd value + 1). (for select) */ | |
b5a0ac70 SS |
157 | int num_fds; |
158 | ||
c2c6d25f | 159 | /* Time structure for calls to select(). */ |
44f45770 | 160 | struct timeval select_timeout; |
c2c6d25f | 161 | |
44f45770 | 162 | /* Flag to tell whether the timeout should be used. */ |
c2c6d25f | 163 | int timeout_valid; |
6426a772 | 164 | } |
b5a0ac70 SS |
165 | gdb_notifier; |
166 | ||
c2c6d25f JM |
167 | /* Structure associated with a timer. PROC will be executed at the |
168 | first occasion after WHEN. */ | |
169 | struct gdb_timer | |
170 | { | |
171 | struct timeval when; | |
172 | int timer_id; | |
173 | struct gdb_timer *next; | |
6426a772 JM |
174 | timer_handler_func *proc; /* Function to call to do the work */ |
175 | gdb_client_data client_data; /* Argument to async_handler_func */ | |
c2c6d25f JM |
176 | } |
177 | gdb_timer; | |
178 | ||
179 | /* List of currently active timers. It is sorted in order of | |
6426a772 | 180 | increasing timers. */ |
c2c6d25f JM |
181 | static struct |
182 | { | |
183 | /* Pointer to first in timer list. */ | |
184 | struct gdb_timer *first_timer; | |
185 | ||
2acceee2 | 186 | /* Id of the last timer created. */ |
c2c6d25f JM |
187 | int num_timers; |
188 | } | |
189 | timer_list; | |
190 | ||
b5a0ac70 SS |
191 | /* All the async_signal_handlers gdb is interested in are kept onto |
192 | this list. */ | |
193 | static struct | |
194 | { | |
195 | /* Pointer to first in handler list. */ | |
c5aa993b JM |
196 | async_signal_handler *first_handler; |
197 | ||
b5a0ac70 | 198 | /* Pointer to last in handler list. */ |
c5aa993b | 199 | async_signal_handler *last_handler; |
b5a0ac70 SS |
200 | } |
201 | sighandler_list; | |
202 | ||
fd0e48ca | 203 | /* Are any of the handlers ready? Check this variable using |
b5a0ac70 SS |
204 | check_async_ready. This is used by process_event, to determine |
205 | whether or not to invoke the invoke_async_signal_handler | |
206 | function. */ | |
207 | static int async_handler_ready = 0; | |
208 | ||
6426a772 | 209 | static void create_file_handler (int fd, int mask, handler_func * proc, gdb_client_data client_data); |
c2c6d25f JM |
210 | static void invoke_async_signal_handler (void); |
211 | static void handle_file_event (int event_file_desc); | |
212 | static int gdb_wait_for_event (void); | |
c2c6d25f | 213 | static int check_async_ready (void); |
6426a772 JM |
214 | static void async_queue_event (gdb_event * event_ptr, queue_position position); |
215 | static gdb_event *create_file_event (int fd); | |
c2c6d25f JM |
216 | static int process_event (void); |
217 | static void handle_timer_event (int dummy); | |
218 | static void poll_timers (void); | |
b5a0ac70 SS |
219 | \f |
220 | ||
221 | /* Insert an event object into the gdb event queue at | |
222 | the specified position. | |
223 | POSITION can be head or tail, with values TAIL, HEAD. | |
224 | EVENT_PTR points to the event to be inserted into the queue. | |
225 | The caller must allocate memory for the event. It is freed | |
226 | after the event has ben handled. | |
227 | Events in the queue will be processed head to tail, therefore, | |
228 | events inserted at the head of the queue will be processed | |
229 | as last in first out. Event appended at the tail of the queue | |
230 | will be processed first in first out. */ | |
231 | static void | |
6426a772 | 232 | async_queue_event (gdb_event * event_ptr, queue_position position) |
b5a0ac70 SS |
233 | { |
234 | if (position == TAIL) | |
235 | { | |
236 | /* The event will become the new last_event. */ | |
237 | ||
238 | event_ptr->next_event = NULL; | |
239 | if (event_queue.first_event == NULL) | |
240 | event_queue.first_event = event_ptr; | |
241 | else | |
242 | event_queue.last_event->next_event = event_ptr; | |
243 | event_queue.last_event = event_ptr; | |
244 | } | |
245 | else if (position == HEAD) | |
246 | { | |
247 | /* The event becomes the new first_event. */ | |
248 | ||
249 | event_ptr->next_event = event_queue.first_event; | |
250 | if (event_queue.first_event == NULL) | |
251 | event_queue.last_event = event_ptr; | |
252 | event_queue.first_event = event_ptr; | |
253 | } | |
254 | } | |
255 | ||
cff3e48b JM |
256 | /* Create a file event, to be enqueued in the event queue for |
257 | processing. The procedure associated to this event is always | |
258 | handle_file_event, which will in turn invoke the one that was | |
259 | associated to FD when it was registered with the event loop. */ | |
c2c6d25f JM |
260 | static gdb_event * |
261 | create_file_event (int fd) | |
cff3e48b JM |
262 | { |
263 | gdb_event *file_event_ptr; | |
264 | ||
265 | file_event_ptr = (gdb_event *) xmalloc (sizeof (gdb_event)); | |
266 | file_event_ptr->proc = handle_file_event; | |
267 | file_event_ptr->fd = fd; | |
268 | return (file_event_ptr); | |
269 | } | |
270 | ||
b5a0ac70 SS |
271 | /* Process one event. |
272 | The event can be the next one to be serviced in the event queue, | |
273 | or an asynchronous event handler can be invoked in response to | |
274 | the reception of a signal. | |
275 | If an event was processed (either way), 1 is returned otherwise | |
276 | 0 is returned. | |
277 | Scan the queue from head to tail, processing therefore the high | |
278 | priority events first, by invoking the associated event handler | |
279 | procedure. */ | |
280 | static int | |
c2c6d25f | 281 | process_event (void) |
b5a0ac70 SS |
282 | { |
283 | gdb_event *event_ptr, *prev_ptr; | |
284 | event_handler_func *proc; | |
285 | int fd; | |
286 | ||
287 | /* First let's see if there are any asynchronous event handlers that | |
288 | are ready. These would be the result of invoking any of the | |
289 | signal handlers. */ | |
290 | ||
291 | if (check_async_ready ()) | |
292 | { | |
293 | invoke_async_signal_handler (); | |
294 | return 1; | |
295 | } | |
296 | ||
297 | /* Look in the event queue to find an event that is ready | |
298 | to be processed. */ | |
299 | ||
300 | for (event_ptr = event_queue.first_event; event_ptr != NULL; | |
301 | event_ptr = event_ptr->next_event) | |
302 | { | |
303 | /* Call the handler for the event. */ | |
304 | ||
305 | proc = event_ptr->proc; | |
306 | fd = event_ptr->fd; | |
307 | ||
308 | /* Let's get rid of the event from the event queue. We need to | |
309 | do this now because while processing the event, the proc | |
310 | function could end up calling 'error' and therefore jump out | |
311 | to the caller of this function, gdb_do_one_event. In that | |
312 | case, we would have on the event queue an event wich has been | |
313 | processed, but not deleted. */ | |
314 | ||
315 | if (event_queue.first_event == event_ptr) | |
316 | { | |
317 | event_queue.first_event = event_ptr->next_event; | |
318 | if (event_ptr->next_event == NULL) | |
319 | event_queue.last_event = NULL; | |
320 | } | |
321 | else | |
322 | { | |
323 | prev_ptr = event_queue.first_event; | |
324 | while (prev_ptr->next_event != event_ptr) | |
325 | prev_ptr = prev_ptr->next_event; | |
326 | ||
327 | prev_ptr->next_event = event_ptr->next_event; | |
328 | if (event_ptr->next_event == NULL) | |
329 | event_queue.last_event = prev_ptr; | |
330 | } | |
b8c9b27d | 331 | xfree (event_ptr); |
b5a0ac70 | 332 | |
44f45770 | 333 | /* Now call the procedure associated with the event. */ |
b5a0ac70 SS |
334 | (*proc) (fd); |
335 | return 1; | |
336 | } | |
337 | ||
338 | /* this is the case if there are no event on the event queue. */ | |
339 | return 0; | |
340 | } | |
341 | ||
342 | /* Process one high level event. If nothing is ready at this time, | |
343 | wait for something to happen (via gdb_wait_for_event), then process | |
11cf8741 JM |
344 | it. Returns >0 if something was done otherwise returns <0 (this |
345 | can happen if there are no event sources to wait for). If an error | |
fd0e48ca | 346 | occurs catch_errors() which calls this function returns zero. */ |
11cf8741 | 347 | |
99656a61 | 348 | int |
11cf8741 | 349 | gdb_do_one_event (void *data) |
b5a0ac70 | 350 | { |
11cf8741 JM |
351 | /* Any events already waiting in the queue? */ |
352 | if (process_event ()) | |
353 | { | |
354 | return 1; | |
355 | } | |
7e5cd2de | 356 | |
11cf8741 JM |
357 | /* Are any timers that are ready? If so, put an event on the queue. */ |
358 | poll_timers (); | |
7e5cd2de | 359 | |
11cf8741 JM |
360 | /* Wait for a new event. If gdb_wait_for_event returns -1, |
361 | we should get out because this means that there are no | |
362 | event sources left. This will make the event loop stop, | |
363 | and the application exit. */ | |
7e5cd2de | 364 | |
11cf8741 JM |
365 | if (gdb_wait_for_event () < 0) |
366 | { | |
367 | return -1; | |
368 | } | |
7e5cd2de | 369 | |
11cf8741 JM |
370 | /* Handle any new events occurred while waiting. */ |
371 | if (process_event ()) | |
372 | { | |
373 | return 1; | |
374 | } | |
7e5cd2de | 375 | |
11cf8741 JM |
376 | /* If gdb_wait_for_event has returned 1, it means that one |
377 | event has been handled. We break out of the loop. */ | |
378 | return 1; | |
379 | } | |
380 | ||
381 | /* Start up the event loop. This is the entry point to the event loop | |
382 | from the command loop. */ | |
b5a0ac70 | 383 | |
11cf8741 JM |
384 | void |
385 | start_event_loop (void) | |
386 | { | |
387 | /* Loop until there is nothing to do. This is the entry point to the | |
388 | event loop engine. gdb_do_one_event, called via catch_errors() | |
389 | will process one event for each invocation. It blocks waits for | |
390 | an event and then processes it. >0 when an event is processed, 0 | |
391 | when catch_errors() caught an error and <0 when there are no | |
392 | longer any event sources registered. */ | |
b5a0ac70 SS |
393 | while (1) |
394 | { | |
3b8630c3 EZ |
395 | int gdb_result; |
396 | ||
397 | gdb_result = catch_errors (gdb_do_one_event, 0, "", RETURN_MASK_ALL); | |
398 | if (gdb_result < 0) | |
11cf8741 | 399 | break; |
3b8630c3 | 400 | if (gdb_result == 0) |
b5a0ac70 | 401 | { |
085dd6e6 JM |
402 | /* FIXME: this should really be a call to a hook that is |
403 | interface specific, because interfaces can display the | |
404 | prompt in their own way. */ | |
b5a0ac70 | 405 | display_gdb_prompt (0); |
467d8519 TT |
406 | /* This call looks bizarre, but it is required. If the user |
407 | entered a command that caused an error, | |
408 | after_char_processing_hook won't be called from | |
409 | rl_callback_read_char_wrapper. Using a cleanup there | |
410 | won't work, since we want this function to be called | |
411 | after a new prompt is printed. */ | |
412 | if (after_char_processing_hook) | |
413 | (*after_char_processing_hook) (); | |
b5a0ac70 SS |
414 | /* Maybe better to set a flag to be checked somewhere as to |
415 | whether display the prompt or not. */ | |
416 | } | |
417 | } | |
085dd6e6 JM |
418 | |
419 | /* We are done with the event loop. There are no more event sources | |
420 | to listen to. So we exit GDB. */ | |
421 | return; | |
422 | } | |
b5a0ac70 SS |
423 | \f |
424 | ||
085dd6e6 JM |
425 | /* Wrapper function for create_file_handler, so that the caller |
426 | doesn't have to know implementation details about the use of poll | |
427 | vs. select. */ | |
c5aa993b | 428 | void |
6426a772 | 429 | add_file_handler (int fd, handler_func * proc, gdb_client_data client_data) |
085dd6e6 JM |
430 | { |
431 | #ifdef HAVE_POLL | |
44f45770 EZ |
432 | struct pollfd fds; |
433 | #endif | |
434 | ||
435 | if (use_poll) | |
436 | { | |
437 | #ifdef HAVE_POLL | |
438 | /* Check to see if poll () is usable. If not, we'll switch to | |
7e5cd2de EZ |
439 | use select. This can happen on systems like |
440 | m68k-motorola-sys, `poll' cannot be used to wait for `stdin'. | |
441 | On m68k-motorola-sysv, tty's are not stream-based and not | |
442 | `poll'able. */ | |
443 | fds.fd = fd; | |
444 | fds.events = POLLIN; | |
445 | if (poll (&fds, 1, 0) == 1 && (fds.revents & POLLNVAL)) | |
446 | use_poll = 0; | |
44f45770 | 447 | #else |
8e65ff28 AC |
448 | internal_error (__FILE__, __LINE__, |
449 | "use_poll without HAVE_POLL"); | |
44f45770 EZ |
450 | #endif /* HAVE_POLL */ |
451 | } | |
452 | if (use_poll) | |
453 | { | |
454 | #ifdef HAVE_POLL | |
455 | create_file_handler (fd, POLLIN, proc, client_data); | |
085dd6e6 | 456 | #else |
8e65ff28 AC |
457 | internal_error (__FILE__, __LINE__, |
458 | "use_poll without HAVE_POLL"); | |
085dd6e6 | 459 | #endif |
44f45770 EZ |
460 | } |
461 | else | |
462 | create_file_handler (fd, GDB_READABLE | GDB_EXCEPTION, proc, client_data); | |
085dd6e6 JM |
463 | } |
464 | ||
b5a0ac70 SS |
465 | /* Add a file handler/descriptor to the list of descriptors we are |
466 | interested in. | |
467 | FD is the file descriptor for the file/stream to be listened to. | |
468 | For the poll case, MASK is a combination (OR) of | |
469 | POLLIN, POLLRDNORM, POLLRDBAND, POLLPRI, POLLOUT, POLLWRNORM, | |
470 | POLLWRBAND: these are the events we are interested in. If any of them | |
471 | occurs, proc should be called. | |
472 | For the select case, MASK is a combination of READABLE, WRITABLE, EXCEPTION. | |
473 | PROC is the procedure that will be called when an event occurs for | |
474 | FD. CLIENT_DATA is the argument to pass to PROC. */ | |
085dd6e6 | 475 | static void |
6426a772 | 476 | create_file_handler (int fd, int mask, handler_func * proc, gdb_client_data client_data) |
b5a0ac70 SS |
477 | { |
478 | file_handler *file_ptr; | |
479 | ||
b5a0ac70 SS |
480 | /* Do we already have a file handler for this file? (We may be |
481 | changing its associated procedure). */ | |
482 | for (file_ptr = gdb_notifier.first_file_handler; file_ptr != NULL; | |
483 | file_ptr = file_ptr->next_file) | |
484 | { | |
485 | if (file_ptr->fd == fd) | |
486 | break; | |
487 | } | |
488 | ||
c2c6d25f | 489 | /* It is a new file descriptor. Add it to the list. Otherwise, just |
6426a772 | 490 | change the data associated with it. */ |
b5a0ac70 SS |
491 | if (file_ptr == NULL) |
492 | { | |
493 | file_ptr = (file_handler *) xmalloc (sizeof (file_handler)); | |
494 | file_ptr->fd = fd; | |
495 | file_ptr->ready_mask = 0; | |
496 | file_ptr->next_file = gdb_notifier.first_file_handler; | |
497 | gdb_notifier.first_file_handler = file_ptr; | |
b5a0ac70 | 498 | |
05a6c72c KS |
499 | if (use_poll) |
500 | { | |
b5a0ac70 | 501 | #ifdef HAVE_POLL |
05a6c72c KS |
502 | gdb_notifier.num_fds++; |
503 | if (gdb_notifier.poll_fds) | |
504 | gdb_notifier.poll_fds = | |
505 | (struct pollfd *) xrealloc (gdb_notifier.poll_fds, | |
506 | (gdb_notifier.num_fds | |
507 | * sizeof (struct pollfd))); | |
508 | else | |
509 | gdb_notifier.poll_fds = | |
510 | (struct pollfd *) xmalloc (sizeof (struct pollfd)); | |
511 | (gdb_notifier.poll_fds + gdb_notifier.num_fds - 1)->fd = fd; | |
512 | (gdb_notifier.poll_fds + gdb_notifier.num_fds - 1)->events = mask; | |
513 | (gdb_notifier.poll_fds + gdb_notifier.num_fds - 1)->revents = 0; | |
44f45770 | 514 | #else |
05a6c72c KS |
515 | internal_error (__FILE__, __LINE__, |
516 | "use_poll without HAVE_POLL"); | |
44f45770 | 517 | #endif /* HAVE_POLL */ |
05a6c72c | 518 | } |
44f45770 | 519 | else |
05a6c72c KS |
520 | { |
521 | if (mask & GDB_READABLE) | |
522 | FD_SET (fd, &gdb_notifier.check_masks[0]); | |
523 | else | |
524 | FD_CLR (fd, &gdb_notifier.check_masks[0]); | |
525 | ||
526 | if (mask & GDB_WRITABLE) | |
527 | FD_SET (fd, &gdb_notifier.check_masks[1]); | |
528 | else | |
529 | FD_CLR (fd, &gdb_notifier.check_masks[1]); | |
530 | ||
531 | if (mask & GDB_EXCEPTION) | |
532 | FD_SET (fd, &gdb_notifier.check_masks[2]); | |
533 | else | |
534 | FD_CLR (fd, &gdb_notifier.check_masks[2]); | |
535 | ||
536 | if (gdb_notifier.num_fds <= fd) | |
537 | gdb_notifier.num_fds = fd + 1; | |
538 | } | |
44f45770 | 539 | } |
05a6c72c KS |
540 | |
541 | file_ptr->proc = proc; | |
542 | file_ptr->client_data = client_data; | |
543 | file_ptr->mask = mask; | |
b5a0ac70 SS |
544 | } |
545 | ||
546 | /* Remove the file descriptor FD from the list of monitored fd's: | |
547 | i.e. we don't care anymore about events on the FD. */ | |
548 | void | |
c2c6d25f | 549 | delete_file_handler (int fd) |
b5a0ac70 SS |
550 | { |
551 | file_handler *file_ptr, *prev_ptr = NULL; | |
58a2c44a EZ |
552 | int i; |
553 | #ifdef HAVE_POLL | |
554 | int j; | |
b5a0ac70 | 555 | struct pollfd *new_poll_fds; |
b5a0ac70 SS |
556 | #endif |
557 | ||
558 | /* Find the entry for the given file. */ | |
559 | ||
560 | for (file_ptr = gdb_notifier.first_file_handler; file_ptr != NULL; | |
561 | file_ptr = file_ptr->next_file) | |
562 | { | |
563 | if (file_ptr->fd == fd) | |
564 | break; | |
565 | } | |
566 | ||
567 | if (file_ptr == NULL) | |
568 | return; | |
569 | ||
44f45770 EZ |
570 | if (use_poll) |
571 | { | |
b5a0ac70 | 572 | #ifdef HAVE_POLL |
44f45770 | 573 | /* Create a new poll_fds array by copying every fd's information but the |
7e5cd2de | 574 | one we want to get rid of. */ |
b5a0ac70 | 575 | |
44f45770 EZ |
576 | new_poll_fds = |
577 | (struct pollfd *) xmalloc ((gdb_notifier.num_fds - 1) * sizeof (struct pollfd)); | |
b5a0ac70 | 578 | |
44f45770 | 579 | for (i = 0, j = 0; i < gdb_notifier.num_fds; i++) |
b5a0ac70 | 580 | { |
44f45770 EZ |
581 | if ((gdb_notifier.poll_fds + i)->fd != fd) |
582 | { | |
583 | (new_poll_fds + j)->fd = (gdb_notifier.poll_fds + i)->fd; | |
584 | (new_poll_fds + j)->events = (gdb_notifier.poll_fds + i)->events; | |
585 | (new_poll_fds + j)->revents = (gdb_notifier.poll_fds + i)->revents; | |
586 | j++; | |
587 | } | |
b5a0ac70 | 588 | } |
b8c9b27d | 589 | xfree (gdb_notifier.poll_fds); |
44f45770 EZ |
590 | gdb_notifier.poll_fds = new_poll_fds; |
591 | gdb_notifier.num_fds--; | |
592 | #else | |
8e65ff28 AC |
593 | internal_error (__FILE__, __LINE__, |
594 | "use_poll without HAVE_POLL"); | |
44f45770 | 595 | #endif /* HAVE_POLL */ |
b5a0ac70 | 596 | } |
44f45770 EZ |
597 | else |
598 | { | |
599 | if (file_ptr->mask & GDB_READABLE) | |
600 | FD_CLR (fd, &gdb_notifier.check_masks[0]); | |
601 | if (file_ptr->mask & GDB_WRITABLE) | |
602 | FD_CLR (fd, &gdb_notifier.check_masks[1]); | |
603 | if (file_ptr->mask & GDB_EXCEPTION) | |
604 | FD_CLR (fd, &gdb_notifier.check_masks[2]); | |
b5a0ac70 | 605 | |
44f45770 | 606 | /* Find current max fd. */ |
b5a0ac70 | 607 | |
44f45770 | 608 | if ((fd + 1) == gdb_notifier.num_fds) |
b5a0ac70 | 609 | { |
44f45770 EZ |
610 | gdb_notifier.num_fds--; |
611 | for (i = gdb_notifier.num_fds; i; i--) | |
612 | { | |
613 | if (FD_ISSET (i - 1, &gdb_notifier.check_masks[0]) | |
614 | || FD_ISSET (i - 1, &gdb_notifier.check_masks[1]) | |
615 | || FD_ISSET (i - 1, &gdb_notifier.check_masks[2])) | |
616 | break; | |
617 | } | |
618 | gdb_notifier.num_fds = i; | |
b5a0ac70 SS |
619 | } |
620 | } | |
b5a0ac70 | 621 | |
cff3e48b JM |
622 | /* Deactivate the file descriptor, by clearing its mask, |
623 | so that it will not fire again. */ | |
624 | ||
625 | file_ptr->mask = 0; | |
626 | ||
b5a0ac70 SS |
627 | /* Get rid of the file handler in the file handler list. */ |
628 | if (file_ptr == gdb_notifier.first_file_handler) | |
629 | gdb_notifier.first_file_handler = file_ptr->next_file; | |
630 | else | |
631 | { | |
632 | for (prev_ptr = gdb_notifier.first_file_handler; | |
9e0b60a8 | 633 | prev_ptr->next_file != file_ptr; |
b5a0ac70 SS |
634 | prev_ptr = prev_ptr->next_file) |
635 | ; | |
636 | prev_ptr->next_file = file_ptr->next_file; | |
637 | } | |
b8c9b27d | 638 | xfree (file_ptr); |
b5a0ac70 SS |
639 | } |
640 | ||
641 | /* Handle the given event by calling the procedure associated to the | |
642 | corresponding file handler. Called by process_event indirectly, | |
643 | through event_ptr->proc. EVENT_FILE_DESC is file descriptor of the | |
644 | event in the front of the event queue. */ | |
645 | static void | |
c2c6d25f | 646 | handle_file_event (int event_file_desc) |
b5a0ac70 SS |
647 | { |
648 | file_handler *file_ptr; | |
c2c6d25f JM |
649 | int mask; |
650 | #ifdef HAVE_POLL | |
651 | int error_mask; | |
652 | int error_mask_returned; | |
653 | #endif | |
b5a0ac70 SS |
654 | |
655 | /* Search the file handler list to find one that matches the fd in | |
656 | the event. */ | |
657 | for (file_ptr = gdb_notifier.first_file_handler; file_ptr != NULL; | |
658 | file_ptr = file_ptr->next_file) | |
659 | { | |
660 | if (file_ptr->fd == event_file_desc) | |
661 | { | |
662 | /* With poll, the ready_mask could have any of three events | |
663 | set to 1: POLLHUP, POLLERR, POLLNVAL. These events cannot | |
664 | be used in the requested event mask (events), but they | |
665 | can be returned in the return mask (revents). We need to | |
666 | check for those event too, and add them to the mask which | |
667 | will be passed to the handler. */ | |
668 | ||
669 | /* See if the desired events (mask) match the received | |
670 | events (ready_mask). */ | |
671 | ||
44f45770 | 672 | if (use_poll) |
c2c6d25f | 673 | { |
44f45770 EZ |
674 | #ifdef HAVE_POLL |
675 | error_mask = POLLHUP | POLLERR | POLLNVAL; | |
676 | mask = (file_ptr->ready_mask & file_ptr->mask) | | |
677 | (file_ptr->ready_mask & error_mask); | |
678 | error_mask_returned = mask & error_mask; | |
679 | ||
680 | if (error_mask_returned != 0) | |
681 | { | |
682 | /* Work in progress. We may need to tell somebody what | |
683 | kind of error we had. */ | |
684 | if (error_mask_returned & POLLHUP) | |
685 | printf_unfiltered ("Hangup detected on fd %d\n", file_ptr->fd); | |
686 | if (error_mask_returned & POLLERR) | |
687 | printf_unfiltered ("Error detected on fd %d\n", file_ptr->fd); | |
688 | if (error_mask_returned & POLLNVAL) | |
689 | printf_unfiltered ("Invalid or non-`poll'able fd %d\n", file_ptr->fd); | |
690 | file_ptr->error = 1; | |
691 | } | |
692 | else | |
693 | file_ptr->error = 0; | |
694 | #else | |
8e65ff28 AC |
695 | internal_error (__FILE__, __LINE__, |
696 | "use_poll without HAVE_POLL"); | |
44f45770 | 697 | #endif /* HAVE_POLL */ |
6426a772 JM |
698 | } |
699 | else | |
c2c6d25f | 700 | { |
44f45770 EZ |
701 | if (file_ptr->ready_mask & GDB_EXCEPTION) |
702 | { | |
703 | printf_unfiltered ("Exception condition detected on fd %d\n", file_ptr->fd); | |
704 | file_ptr->error = 1; | |
705 | } | |
706 | else | |
707 | file_ptr->error = 0; | |
708 | mask = file_ptr->ready_mask & file_ptr->mask; | |
c2c6d25f | 709 | } |
b5a0ac70 SS |
710 | |
711 | /* Clear the received events for next time around. */ | |
712 | file_ptr->ready_mask = 0; | |
713 | ||
714 | /* If there was a match, then call the handler. */ | |
715 | if (mask != 0) | |
2acceee2 | 716 | (*file_ptr->proc) (file_ptr->error, file_ptr->client_data); |
b5a0ac70 SS |
717 | break; |
718 | } | |
719 | } | |
720 | } | |
721 | ||
722 | /* Called by gdb_do_one_event to wait for new events on the | |
723 | monitored file descriptors. Queue file events as they are | |
724 | detected by the poll. | |
725 | If there are no events, this function will block in the | |
726 | call to poll. | |
727 | Return -1 if there are no files descriptors to monitor, | |
728 | otherwise return 0. */ | |
729 | static int | |
c2c6d25f | 730 | gdb_wait_for_event (void) |
b5a0ac70 SS |
731 | { |
732 | file_handler *file_ptr; | |
733 | gdb_event *file_event_ptr; | |
0f71a2f6 JM |
734 | int num_found = 0; |
735 | int i; | |
b5a0ac70 | 736 | |
7be570e7 JM |
737 | /* Make sure all output is done before getting another event. */ |
738 | gdb_flush (gdb_stdout); | |
739 | gdb_flush (gdb_stderr); | |
740 | ||
b5a0ac70 SS |
741 | if (gdb_notifier.num_fds == 0) |
742 | return -1; | |
743 | ||
44f45770 EZ |
744 | if (use_poll) |
745 | { | |
b5a0ac70 | 746 | #ifdef HAVE_POLL |
44f45770 EZ |
747 | num_found = |
748 | poll (gdb_notifier.poll_fds, | |
749 | (unsigned long) gdb_notifier.num_fds, | |
750 | gdb_notifier.timeout_valid ? gdb_notifier.poll_timeout : -1); | |
751 | ||
752 | /* Don't print anything if we get out of poll because of a | |
7e5cd2de | 753 | signal. */ |
44f45770 EZ |
754 | if (num_found == -1 && errno != EINTR) |
755 | perror_with_name ("Poll"); | |
756 | #else | |
8e65ff28 AC |
757 | internal_error (__FILE__, __LINE__, |
758 | "use_poll without HAVE_POLL"); | |
44f45770 EZ |
759 | #endif /* HAVE_POLL */ |
760 | } | |
761 | else | |
c2c6d25f | 762 | { |
44f45770 EZ |
763 | gdb_notifier.ready_masks[0] = gdb_notifier.check_masks[0]; |
764 | gdb_notifier.ready_masks[1] = gdb_notifier.check_masks[1]; | |
765 | gdb_notifier.ready_masks[2] = gdb_notifier.check_masks[2]; | |
766 | num_found = select (gdb_notifier.num_fds, | |
7e5cd2de EZ |
767 | &gdb_notifier.ready_masks[0], |
768 | &gdb_notifier.ready_masks[1], | |
769 | &gdb_notifier.ready_masks[2], | |
44f45770 EZ |
770 | gdb_notifier.timeout_valid |
771 | ? &gdb_notifier.select_timeout : NULL); | |
772 | ||
773 | /* Clear the masks after an error from select. */ | |
774 | if (num_found == -1) | |
775 | { | |
776 | FD_ZERO (&gdb_notifier.ready_masks[0]); | |
777 | FD_ZERO (&gdb_notifier.ready_masks[1]); | |
778 | FD_ZERO (&gdb_notifier.ready_masks[2]); | |
779 | /* Dont print anything is we got a signal, let gdb handle it. */ | |
780 | if (errno != EINTR) | |
781 | perror_with_name ("Select"); | |
782 | } | |
c2c6d25f | 783 | } |
b5a0ac70 SS |
784 | |
785 | /* Enqueue all detected file events. */ | |
786 | ||
44f45770 EZ |
787 | if (use_poll) |
788 | { | |
b5a0ac70 | 789 | #ifdef HAVE_POLL |
44f45770 EZ |
790 | for (i = 0; (i < gdb_notifier.num_fds) && (num_found > 0); i++) |
791 | { | |
792 | if ((gdb_notifier.poll_fds + i)->revents) | |
793 | num_found--; | |
794 | else | |
795 | continue; | |
b5a0ac70 | 796 | |
44f45770 EZ |
797 | for (file_ptr = gdb_notifier.first_file_handler; |
798 | file_ptr != NULL; | |
799 | file_ptr = file_ptr->next_file) | |
800 | { | |
801 | if (file_ptr->fd == (gdb_notifier.poll_fds + i)->fd) | |
802 | break; | |
803 | } | |
804 | ||
805 | if (file_ptr) | |
806 | { | |
807 | /* Enqueue an event only if this is still a new event for | |
7e5cd2de | 808 | this fd. */ |
44f45770 EZ |
809 | if (file_ptr->ready_mask == 0) |
810 | { | |
811 | file_event_ptr = create_file_event (file_ptr->fd); | |
812 | async_queue_event (file_event_ptr, TAIL); | |
813 | } | |
814 | } | |
b5a0ac70 | 815 | |
44f45770 EZ |
816 | file_ptr->ready_mask = (gdb_notifier.poll_fds + i)->revents; |
817 | } | |
818 | #else | |
8e65ff28 AC |
819 | internal_error (__FILE__, __LINE__, |
820 | "use_poll without HAVE_POLL"); | |
44f45770 EZ |
821 | #endif /* HAVE_POLL */ |
822 | } | |
823 | else | |
824 | { | |
b5a0ac70 | 825 | for (file_ptr = gdb_notifier.first_file_handler; |
44f45770 | 826 | (file_ptr != NULL) && (num_found > 0); |
b5a0ac70 SS |
827 | file_ptr = file_ptr->next_file) |
828 | { | |
44f45770 EZ |
829 | int mask = 0; |
830 | ||
831 | if (FD_ISSET (file_ptr->fd, &gdb_notifier.ready_masks[0])) | |
832 | mask |= GDB_READABLE; | |
833 | if (FD_ISSET (file_ptr->fd, &gdb_notifier.ready_masks[1])) | |
834 | mask |= GDB_WRITABLE; | |
835 | if (FD_ISSET (file_ptr->fd, &gdb_notifier.ready_masks[2])) | |
836 | mask |= GDB_EXCEPTION; | |
837 | ||
838 | if (!mask) | |
839 | continue; | |
840 | else | |
841 | num_found--; | |
b5a0ac70 | 842 | |
b5a0ac70 SS |
843 | /* Enqueue an event only if this is still a new event for |
844 | this fd. */ | |
44f45770 | 845 | |
b5a0ac70 SS |
846 | if (file_ptr->ready_mask == 0) |
847 | { | |
cff3e48b | 848 | file_event_ptr = create_file_event (file_ptr->fd); |
b5a0ac70 SS |
849 | async_queue_event (file_event_ptr, TAIL); |
850 | } | |
44f45770 | 851 | file_ptr->ready_mask = mask; |
b5a0ac70 | 852 | } |
b5a0ac70 | 853 | } |
b5a0ac70 SS |
854 | return 0; |
855 | } | |
856 | \f | |
857 | ||
858 | /* Create an asynchronous handler, allocating memory for it. | |
859 | Return a pointer to the newly created handler. | |
860 | This pointer will be used to invoke the handler by | |
861 | invoke_async_signal_handler. | |
862 | PROC is the function to call with CLIENT_DATA argument | |
863 | whenever the handler is invoked. */ | |
864 | async_signal_handler * | |
6426a772 | 865 | create_async_signal_handler (sig_handler_func * proc, gdb_client_data client_data) |
b5a0ac70 SS |
866 | { |
867 | async_signal_handler *async_handler_ptr; | |
868 | ||
869 | async_handler_ptr = | |
870 | (async_signal_handler *) xmalloc (sizeof (async_signal_handler)); | |
871 | async_handler_ptr->ready = 0; | |
872 | async_handler_ptr->next_handler = NULL; | |
873 | async_handler_ptr->proc = proc; | |
874 | async_handler_ptr->client_data = client_data; | |
875 | if (sighandler_list.first_handler == NULL) | |
876 | sighandler_list.first_handler = async_handler_ptr; | |
877 | else | |
878 | sighandler_list.last_handler->next_handler = async_handler_ptr; | |
879 | sighandler_list.last_handler = async_handler_ptr; | |
880 | return async_handler_ptr; | |
881 | } | |
882 | ||
883 | /* Mark the handler (ASYNC_HANDLER_PTR) as ready. This information will | |
884 | be used when the handlers are invoked, after we have waited for | |
885 | some event. The caller of this function is the interrupt handler | |
886 | associated with a signal. */ | |
887 | void | |
6426a772 | 888 | mark_async_signal_handler (async_signal_handler * async_handler_ptr) |
b5a0ac70 SS |
889 | { |
890 | ((async_signal_handler *) async_handler_ptr)->ready = 1; | |
891 | async_handler_ready = 1; | |
892 | } | |
893 | ||
894 | /* Call all the handlers that are ready. */ | |
895 | static void | |
c2c6d25f | 896 | invoke_async_signal_handler (void) |
b5a0ac70 SS |
897 | { |
898 | async_signal_handler *async_handler_ptr; | |
899 | ||
900 | if (async_handler_ready == 0) | |
901 | return; | |
902 | async_handler_ready = 0; | |
903 | ||
904 | /* Invoke ready handlers. */ | |
905 | ||
906 | while (1) | |
907 | { | |
c5aa993b | 908 | for (async_handler_ptr = sighandler_list.first_handler; |
b5a0ac70 SS |
909 | async_handler_ptr != NULL; |
910 | async_handler_ptr = async_handler_ptr->next_handler) | |
911 | { | |
912 | if (async_handler_ptr->ready) | |
913 | break; | |
914 | } | |
915 | if (async_handler_ptr == NULL) | |
916 | break; | |
917 | async_handler_ptr->ready = 0; | |
918 | (*async_handler_ptr->proc) (async_handler_ptr->client_data); | |
919 | } | |
920 | ||
921 | return; | |
922 | } | |
923 | ||
924 | /* Delete an asynchronous handler (ASYNC_HANDLER_PTR). | |
925 | Free the space allocated for it. */ | |
926 | void | |
6426a772 | 927 | delete_async_signal_handler (async_signal_handler ** async_handler_ptr) |
b5a0ac70 SS |
928 | { |
929 | async_signal_handler *prev_ptr; | |
930 | ||
43ff13b4 | 931 | if (sighandler_list.first_handler == (*async_handler_ptr)) |
b5a0ac70 | 932 | { |
43ff13b4 | 933 | sighandler_list.first_handler = (*async_handler_ptr)->next_handler; |
b5a0ac70 SS |
934 | if (sighandler_list.first_handler == NULL) |
935 | sighandler_list.last_handler = NULL; | |
936 | } | |
937 | else | |
938 | { | |
939 | prev_ptr = sighandler_list.first_handler; | |
43ff13b4 | 940 | while (prev_ptr->next_handler != (*async_handler_ptr) && prev_ptr) |
b5a0ac70 | 941 | prev_ptr = prev_ptr->next_handler; |
43ff13b4 JM |
942 | prev_ptr->next_handler = (*async_handler_ptr)->next_handler; |
943 | if (sighandler_list.last_handler == (*async_handler_ptr)) | |
b5a0ac70 SS |
944 | sighandler_list.last_handler = prev_ptr; |
945 | } | |
b8c9b27d | 946 | xfree ((*async_handler_ptr)); |
43ff13b4 | 947 | (*async_handler_ptr) = NULL; |
b5a0ac70 SS |
948 | } |
949 | ||
950 | /* Is it necessary to call invoke_async_signal_handler? */ | |
951 | static int | |
c2c6d25f | 952 | check_async_ready (void) |
b5a0ac70 SS |
953 | { |
954 | return async_handler_ready; | |
955 | } | |
c2c6d25f | 956 | |
c2c6d25f JM |
957 | /* Create a timer that will expire in MILLISECONDS from now. When the |
958 | timer is ready, PROC will be executed. At creation, the timer is | |
959 | aded to the timers queue. This queue is kept sorted in order of | |
6426a772 | 960 | increasing timers. Return a handle to the timer struct. */ |
c2c6d25f | 961 | int |
6426a772 | 962 | create_timer (int milliseconds, timer_handler_func * proc, gdb_client_data client_data) |
c2c6d25f JM |
963 | { |
964 | struct gdb_timer *timer_ptr, *timer_index, *prev_timer; | |
965 | struct timeval time_now, delta; | |
966 | ||
967 | /* compute seconds */ | |
968 | delta.tv_sec = milliseconds / 1000; | |
969 | /* compute microseconds */ | |
6426a772 JM |
970 | delta.tv_usec = (milliseconds % 1000) * 1000; |
971 | ||
c2c6d25f JM |
972 | gettimeofday (&time_now, NULL); |
973 | ||
974 | timer_ptr = (struct gdb_timer *) xmalloc (sizeof (gdb_timer)); | |
975 | timer_ptr->when.tv_sec = time_now.tv_sec + delta.tv_sec; | |
976 | timer_ptr->when.tv_usec = time_now.tv_usec + delta.tv_usec; | |
977 | /* carry? */ | |
6426a772 | 978 | if (timer_ptr->when.tv_usec >= 1000000) |
c2c6d25f JM |
979 | { |
980 | timer_ptr->when.tv_sec += 1; | |
981 | timer_ptr->when.tv_usec -= 1000000; | |
982 | } | |
983 | timer_ptr->proc = proc; | |
984 | timer_ptr->client_data = client_data; | |
6426a772 | 985 | timer_list.num_timers++; |
c2c6d25f JM |
986 | timer_ptr->timer_id = timer_list.num_timers; |
987 | ||
988 | /* Now add the timer to the timer queue, making sure it is sorted in | |
989 | increasing order of expiration. */ | |
990 | ||
6426a772 JM |
991 | for (timer_index = timer_list.first_timer; |
992 | timer_index != NULL; | |
c2c6d25f JM |
993 | timer_index = timer_index->next) |
994 | { | |
995 | /* If the seconds field is greater or if it is the same, but the | |
996 | microsecond field is greater. */ | |
6426a772 | 997 | if ((timer_index->when.tv_sec > timer_ptr->when.tv_sec) || |
c2c6d25f JM |
998 | ((timer_index->when.tv_sec == timer_ptr->when.tv_sec) |
999 | && (timer_index->when.tv_usec > timer_ptr->when.tv_usec))) | |
1000 | break; | |
1001 | } | |
6426a772 | 1002 | |
c2c6d25f JM |
1003 | if (timer_index == timer_list.first_timer) |
1004 | { | |
1005 | timer_ptr->next = timer_list.first_timer; | |
1006 | timer_list.first_timer = timer_ptr; | |
1007 | ||
1008 | } | |
1009 | else | |
1010 | { | |
6426a772 JM |
1011 | for (prev_timer = timer_list.first_timer; |
1012 | prev_timer->next != timer_index; | |
c2c6d25f JM |
1013 | prev_timer = prev_timer->next) |
1014 | ; | |
6426a772 | 1015 | |
c2c6d25f JM |
1016 | prev_timer->next = timer_ptr; |
1017 | timer_ptr->next = timer_index; | |
1018 | } | |
1019 | ||
1020 | gdb_notifier.timeout_valid = 0; | |
1021 | return timer_ptr->timer_id; | |
1022 | } | |
1023 | ||
1024 | /* There is a chance that the creator of the timer wants to get rid of | |
1025 | it before it expires. */ | |
1026 | void | |
1027 | delete_timer (int id) | |
1028 | { | |
1029 | struct gdb_timer *timer_ptr, *prev_timer = NULL; | |
1030 | ||
1031 | /* Find the entry for the given timer. */ | |
1032 | ||
1033 | for (timer_ptr = timer_list.first_timer; timer_ptr != NULL; | |
1034 | timer_ptr = timer_ptr->next) | |
1035 | { | |
1036 | if (timer_ptr->timer_id == id) | |
1037 | break; | |
1038 | } | |
1039 | ||
1040 | if (timer_ptr == NULL) | |
1041 | return; | |
1042 | /* Get rid of the timer in the timer list. */ | |
1043 | if (timer_ptr == timer_list.first_timer) | |
1044 | timer_list.first_timer = timer_ptr->next; | |
1045 | else | |
1046 | { | |
1047 | for (prev_timer = timer_list.first_timer; | |
1048 | prev_timer->next != timer_ptr; | |
1049 | prev_timer = prev_timer->next) | |
1050 | ; | |
1051 | prev_timer->next = timer_ptr->next; | |
1052 | } | |
b8c9b27d | 1053 | xfree (timer_ptr); |
c2c6d25f JM |
1054 | |
1055 | gdb_notifier.timeout_valid = 0; | |
1056 | } | |
1057 | ||
1058 | /* When a timer event is put on the event queue, it will be handled by | |
1059 | this function. Just call the assiciated procedure and delete the | |
1060 | timer event from the event queue. Repeat this for each timer that | |
6426a772 | 1061 | has expired. */ |
c2c6d25f JM |
1062 | static void |
1063 | handle_timer_event (int dummy) | |
1064 | { | |
1065 | struct timeval time_now; | |
1066 | struct gdb_timer *timer_ptr, *saved_timer; | |
6426a772 | 1067 | |
c2c6d25f JM |
1068 | gettimeofday (&time_now, NULL); |
1069 | timer_ptr = timer_list.first_timer; | |
1070 | ||
1071 | while (timer_ptr != NULL) | |
1072 | { | |
6426a772 JM |
1073 | if ((timer_ptr->when.tv_sec > time_now.tv_sec) || |
1074 | ((timer_ptr->when.tv_sec == time_now.tv_sec) && | |
c2c6d25f JM |
1075 | (timer_ptr->when.tv_usec > time_now.tv_usec))) |
1076 | break; | |
1077 | ||
1078 | /* Get rid of the timer from the beginning of the list. */ | |
1079 | timer_list.first_timer = timer_ptr->next; | |
1080 | saved_timer = timer_ptr; | |
1081 | timer_ptr = timer_ptr->next; | |
1082 | /* Call the procedure associated with that timer. */ | |
c4093a6a | 1083 | (*saved_timer->proc) (saved_timer->client_data); |
b8c9b27d | 1084 | xfree (saved_timer); |
c2c6d25f JM |
1085 | } |
1086 | ||
1087 | gdb_notifier.timeout_valid = 0; | |
1088 | } | |
6426a772 | 1089 | |
c2c6d25f JM |
1090 | /* Check whether any timers in the timers queue are ready. If at least |
1091 | one timer is ready, stick an event onto the event queue. Even in | |
1092 | case more than one timer is ready, one event is enough, because the | |
1093 | handle_timer_event() will go through the timers list and call the | |
1094 | procedures associated with all that have expired. Update the | |
6426a772 | 1095 | timeout for the select() or poll() as well. */ |
c2c6d25f JM |
1096 | static void |
1097 | poll_timers (void) | |
1098 | { | |
1099 | struct timeval time_now, delta; | |
1100 | gdb_event *event_ptr; | |
6426a772 | 1101 | |
2acceee2 | 1102 | if (timer_list.first_timer != NULL) |
c2c6d25f JM |
1103 | { |
1104 | gettimeofday (&time_now, NULL); | |
1105 | delta.tv_sec = timer_list.first_timer->when.tv_sec - time_now.tv_sec; | |
1106 | delta.tv_usec = timer_list.first_timer->when.tv_usec - time_now.tv_usec; | |
1107 | /* borrow? */ | |
1108 | if (delta.tv_usec < 0) | |
1109 | { | |
1110 | delta.tv_sec -= 1; | |
1111 | delta.tv_usec += 1000000; | |
1112 | } | |
6426a772 | 1113 | |
c2c6d25f | 1114 | /* Oops it expired already. Tell select / poll to return |
2f16bb32 | 1115 | immediately. (Cannot simply test if delta.tv_sec is negative |
7e5cd2de | 1116 | because time_t might be unsigned.) */ |
2f16bb32 EZ |
1117 | if (timer_list.first_timer->when.tv_sec < time_now.tv_sec |
1118 | || (timer_list.first_timer->when.tv_sec == time_now.tv_sec | |
1119 | && timer_list.first_timer->when.tv_usec < time_now.tv_usec)) | |
c2c6d25f JM |
1120 | { |
1121 | delta.tv_sec = 0; | |
1122 | delta.tv_usec = 0; | |
1123 | } | |
1124 | ||
1125 | if (delta.tv_sec == 0 && delta.tv_usec == 0) | |
1126 | { | |
1127 | event_ptr = (gdb_event *) xmalloc (sizeof (gdb_event)); | |
1128 | event_ptr->proc = handle_timer_event; | |
1129 | event_ptr->fd = timer_list.first_timer->timer_id; | |
1130 | async_queue_event (event_ptr, TAIL); | |
1131 | } | |
1132 | ||
1133 | /* Now we need to update the timeout for select/ poll, because we | |
6426a772 | 1134 | don't want to sit there while this timer is expiring. */ |
44f45770 EZ |
1135 | if (use_poll) |
1136 | { | |
c2c6d25f | 1137 | #ifdef HAVE_POLL |
44f45770 | 1138 | gdb_notifier.poll_timeout = delta.tv_sec * 1000; |
c2c6d25f | 1139 | #else |
8e65ff28 AC |
1140 | internal_error (__FILE__, __LINE__, |
1141 | "use_poll without HAVE_POLL"); | |
44f45770 EZ |
1142 | #endif /* HAVE_POLL */ |
1143 | } | |
1144 | else | |
1145 | { | |
1146 | gdb_notifier.select_timeout.tv_sec = delta.tv_sec; | |
1147 | gdb_notifier.select_timeout.tv_usec = delta.tv_usec; | |
1148 | } | |
c2c6d25f JM |
1149 | gdb_notifier.timeout_valid = 1; |
1150 | } | |
6426a772 | 1151 | else |
c2c6d25f JM |
1152 | gdb_notifier.timeout_valid = 0; |
1153 | } |