Commit | Line | Data |
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3eb25fda MM |
1 | /* Generic serial interface functions. |
2 | ||
b811d2c2 | 3 | Copyright (C) 1992-2020 Free Software Foundation, Inc. |
3eb25fda MM |
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 | |
a9762ec7 | 9 | the Free Software Foundation; either version 3 of the License, or |
3eb25fda MM |
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 | |
a9762ec7 | 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
3eb25fda MM |
19 | |
20 | #include "defs.h" | |
21 | #include "serial.h" | |
a07ff70c | 22 | #include "ser-base.h" |
400b5eca | 23 | #include "gdbsupport/event-loop.h" |
a07ff70c | 24 | |
06cc9596 | 25 | #include "gdbsupport/gdb_select.h" |
268a13a5 | 26 | #include "gdbsupport/gdb_sys_time.h" |
b4505029 MM |
27 | #ifdef USE_WIN32API |
28 | #include <winsock2.h> | |
29 | #endif | |
3eb25fda | 30 | |
401e7faf | 31 | |
3eb25fda MM |
32 | static timer_handler_func push_event; |
33 | static handler_func fd_event; | |
34 | ||
35 | /* Event handling for ASYNC serial code. | |
36 | ||
37 | At any time the SERIAL device either: has an empty FIFO and is | |
38 | waiting on a FD event; or has a non-empty FIFO/error condition and | |
39 | is constantly scheduling timer events. | |
40 | ||
41 | ASYNC only stops pestering its client when it is de-async'ed or it | |
c378eb4e | 42 | is told to go away. */ |
3eb25fda MM |
43 | |
44 | /* Value of scb->async_state: */ | |
45 | enum { | |
bd356ec6 SM |
46 | /* When >= 0, this contains the ID of the currently scheduled timer event. |
47 | This state is rarely encountered. Timer events are one-off so as soon as | |
48 | the event is delivered the state is changed to NOTHING_SCHEDULED. */ | |
49 | ||
3eb25fda | 50 | /* The fd_event() handler is scheduled. It is called when ever the |
c378eb4e | 51 | file descriptor becomes ready. */ |
bd356ec6 SM |
52 | FD_SCHEDULED = -1, |
53 | ||
3eb25fda MM |
54 | /* Either no task is scheduled (just going into ASYNC mode) or a |
55 | timer event has just gone off and the current state has been | |
c378eb4e | 56 | forced into nothing scheduled. */ |
bd356ec6 | 57 | NOTHING_SCHEDULED = -2 |
3eb25fda MM |
58 | }; |
59 | ||
60 | /* Identify and schedule the next ASYNC task based on scb->async_state | |
61 | and scb->buf* (the input FIFO). A state machine is used to avoid | |
62 | the need to make redundant calls into the event-loop - the next | |
c378eb4e | 63 | scheduled task is only changed when needed. */ |
3eb25fda | 64 | |
a26d8d11 | 65 | static void |
3eb25fda MM |
66 | reschedule (struct serial *scb) |
67 | { | |
68 | if (serial_is_async_p (scb)) | |
69 | { | |
70 | int next_state; | |
433759f7 | 71 | |
3eb25fda MM |
72 | switch (scb->async_state) |
73 | { | |
74 | case FD_SCHEDULED: | |
75 | if (scb->bufcnt == 0) | |
76 | next_state = FD_SCHEDULED; | |
77 | else | |
78 | { | |
79 | delete_file_handler (scb->fd); | |
80 | next_state = create_timer (0, push_event, scb); | |
81 | } | |
82 | break; | |
83 | case NOTHING_SCHEDULED: | |
84 | if (scb->bufcnt == 0) | |
85 | { | |
86 | add_file_handler (scb->fd, fd_event, scb); | |
87 | next_state = FD_SCHEDULED; | |
88 | } | |
89 | else | |
90 | { | |
91 | next_state = create_timer (0, push_event, scb); | |
92 | } | |
93 | break; | |
94 | default: /* TIMER SCHEDULED */ | |
95 | if (scb->bufcnt == 0) | |
96 | { | |
97 | delete_timer (scb->async_state); | |
98 | add_file_handler (scb->fd, fd_event, scb); | |
99 | next_state = FD_SCHEDULED; | |
100 | } | |
101 | else | |
102 | next_state = scb->async_state; | |
103 | break; | |
104 | } | |
105 | if (serial_debug_p (scb)) | |
106 | { | |
107 | switch (next_state) | |
108 | { | |
109 | case FD_SCHEDULED: | |
110 | if (scb->async_state != FD_SCHEDULED) | |
111 | fprintf_unfiltered (gdb_stdlog, "[fd%d->fd-scheduled]\n", | |
112 | scb->fd); | |
113 | break; | |
114 | default: /* TIMER SCHEDULED */ | |
115 | if (scb->async_state == FD_SCHEDULED) | |
116 | fprintf_unfiltered (gdb_stdlog, "[fd%d->timer-scheduled]\n", | |
117 | scb->fd); | |
118 | break; | |
119 | } | |
120 | } | |
121 | scb->async_state = next_state; | |
122 | } | |
123 | } | |
124 | ||
ddefb60f PA |
125 | /* Run the SCB's async handle, and reschedule, if the handler doesn't |
126 | close SCB. */ | |
127 | ||
128 | static void | |
129 | run_async_handler_and_reschedule (struct serial *scb) | |
130 | { | |
131 | int is_open; | |
132 | ||
133 | /* Take a reference, so a serial_close call within the handler | |
134 | doesn't make SCB a dangling pointer. */ | |
135 | serial_ref (scb); | |
136 | ||
137 | /* Run the handler. */ | |
138 | scb->async_handler (scb, scb->async_context); | |
139 | ||
140 | is_open = serial_is_open (scb); | |
141 | serial_unref (scb); | |
142 | ||
143 | /* Get ready for more, if not already closed. */ | |
144 | if (is_open) | |
145 | reschedule (scb); | |
146 | } | |
147 | ||
3eb25fda MM |
148 | /* FD_EVENT: This is scheduled when the input FIFO is empty (and there |
149 | is no pending error). As soon as data arrives, it is read into the | |
150 | input FIFO and the client notified. The client should then drain | |
151 | the FIFO using readchar(). If the FIFO isn't immediatly emptied, | |
c378eb4e | 152 | push_event() is used to nag the client until it is. */ |
3eb25fda MM |
153 | |
154 | static void | |
155 | fd_event (int error, void *context) | |
156 | { | |
19ba03f4 | 157 | struct serial *scb = (struct serial *) context; |
3eb25fda MM |
158 | if (error != 0) |
159 | { | |
160 | scb->bufcnt = SERIAL_ERROR; | |
161 | } | |
162 | else if (scb->bufcnt == 0) | |
163 | { | |
164 | /* Prime the input FIFO. The readchar() function is used to | |
165 | pull characters out of the buffer. See also | |
c378eb4e | 166 | generic_readchar(). */ |
3eb25fda | 167 | int nr; |
75ee5925 PA |
168 | |
169 | do | |
170 | { | |
171 | nr = scb->ops->read_prim (scb, BUFSIZ); | |
172 | } | |
173 | while (nr < 0 && errno == EINTR); | |
174 | ||
3eb25fda MM |
175 | if (nr == 0) |
176 | { | |
177 | scb->bufcnt = SERIAL_EOF; | |
178 | } | |
179 | else if (nr > 0) | |
180 | { | |
181 | scb->bufcnt = nr; | |
182 | scb->bufp = scb->buf; | |
183 | } | |
184 | else | |
185 | { | |
186 | scb->bufcnt = SERIAL_ERROR; | |
187 | } | |
188 | } | |
ddefb60f | 189 | run_async_handler_and_reschedule (scb); |
3eb25fda MM |
190 | } |
191 | ||
192 | /* PUSH_EVENT: The input FIFO is non-empty (or there is a pending | |
193 | error). Nag the client until all the data has been read. In the | |
194 | case of errors, the client will need to close or de-async the | |
85102364 | 195 | device before nagging stops. */ |
3eb25fda MM |
196 | |
197 | static void | |
198 | push_event (void *context) | |
199 | { | |
19ba03f4 | 200 | struct serial *scb = (struct serial *) context; |
433759f7 | 201 | |
3eb25fda | 202 | scb->async_state = NOTHING_SCHEDULED; /* Timers are one-off */ |
ddefb60f | 203 | run_async_handler_and_reschedule (scb); |
3eb25fda MM |
204 | } |
205 | ||
b4505029 | 206 | /* Wait for input on scb, with timeout seconds. Returns 0 on success, |
c378eb4e | 207 | otherwise SERIAL_TIMEOUT or SERIAL_ERROR. */ |
b4505029 | 208 | |
9bcbdca8 PA |
209 | /* NOTE: Some of the code below is dead. The only possible values of |
210 | the TIMEOUT parameter are ONE and ZERO. OTOH, we should probably | |
211 | get rid of the deprecated_ui_loop_hook call in do_ser_base_readchar | |
212 | instead and support infinite time outs here. */ | |
213 | ||
b4505029 MM |
214 | static int |
215 | ser_base_wait_for (struct serial *scb, int timeout) | |
216 | { | |
217 | while (1) | |
218 | { | |
219 | int numfds; | |
220 | struct timeval tv; | |
221 | fd_set readfds, exceptfds; | |
048094ac | 222 | int nfds; |
b4505029 MM |
223 | |
224 | /* NOTE: Some OS's can scramble the READFDS when the select() | |
225 | call fails (ex the kernel with Red Hat 5.2). Initialize all | |
c378eb4e | 226 | arguments before each call. */ |
b4505029 MM |
227 | |
228 | tv.tv_sec = timeout; | |
229 | tv.tv_usec = 0; | |
230 | ||
231 | FD_ZERO (&readfds); | |
232 | FD_ZERO (&exceptfds); | |
233 | FD_SET (scb->fd, &readfds); | |
234 | FD_SET (scb->fd, &exceptfds); | |
235 | ||
048094ac PA |
236 | QUIT; |
237 | ||
238 | nfds = scb->fd + 1; | |
b4505029 | 239 | if (timeout >= 0) |
048094ac | 240 | numfds = interruptible_select (nfds, &readfds, 0, &exceptfds, &tv); |
b4505029 | 241 | else |
048094ac | 242 | numfds = interruptible_select (nfds, &readfds, 0, &exceptfds, 0); |
b4505029 MM |
243 | |
244 | if (numfds <= 0) | |
245 | { | |
246 | if (numfds == 0) | |
247 | return SERIAL_TIMEOUT; | |
248 | else if (errno == EINTR) | |
249 | continue; | |
250 | else | |
c378eb4e MS |
251 | return SERIAL_ERROR; /* Got an error from select or |
252 | poll. */ | |
b4505029 MM |
253 | } |
254 | ||
255 | return 0; | |
256 | } | |
257 | } | |
258 | ||
3347eb1a | 259 | /* Read any error output we might have. */ |
260 | ||
261 | static void | |
262 | ser_base_read_error_fd (struct serial *scb, int close_fd) | |
263 | { | |
264 | if (scb->error_fd != -1) | |
265 | { | |
266 | ssize_t s; | |
267 | char buf[GDB_MI_MSG_WIDTH + 1]; | |
268 | ||
269 | for (;;) | |
270 | { | |
271 | char *current; | |
272 | char *newline; | |
273 | int to_read = GDB_MI_MSG_WIDTH; | |
274 | int num_bytes = -1; | |
275 | ||
276 | if (scb->ops->avail) | |
277 | num_bytes = (scb->ops->avail)(scb, scb->error_fd); | |
278 | ||
279 | if (num_bytes != -1) | |
280 | to_read = (num_bytes < to_read) ? num_bytes : to_read; | |
281 | ||
282 | if (to_read == 0) | |
283 | break; | |
284 | ||
285 | s = read (scb->error_fd, &buf, to_read); | |
286 | if ((s == -1) || (s == 0 && !close_fd)) | |
287 | break; | |
288 | ||
289 | if (s == 0 && close_fd) | |
290 | { | |
291 | /* End of file. */ | |
a75868f5 PA |
292 | if (serial_is_async_p (scb)) |
293 | delete_file_handler (scb->error_fd); | |
3347eb1a | 294 | close (scb->error_fd); |
295 | scb->error_fd = -1; | |
296 | break; | |
297 | } | |
298 | ||
299 | /* In theory, embedded newlines are not a problem. | |
300 | But for MI, we want each output line to have just | |
301 | one newline for legibility. So output things | |
302 | in newline chunks. */ | |
303 | gdb_assert (s > 0 && s <= GDB_MI_MSG_WIDTH); | |
304 | buf[s] = '\0'; | |
305 | current = buf; | |
306 | while ((newline = strstr (current, "\n")) != NULL) | |
307 | { | |
308 | *newline = '\0'; | |
309 | fputs_unfiltered (current, gdb_stderr); | |
310 | fputs_unfiltered ("\n", gdb_stderr); | |
311 | current = newline + 1; | |
312 | } | |
313 | ||
314 | fputs_unfiltered (current, gdb_stderr); | |
315 | } | |
316 | } | |
317 | } | |
318 | ||
a75868f5 PA |
319 | /* Event-loop callback for a serial's error_fd. Flushes any error |
320 | output we might have. */ | |
321 | ||
322 | static void | |
323 | handle_error_fd (int error, gdb_client_data client_data) | |
324 | { | |
325 | serial *scb = (serial *) client_data; | |
326 | ||
327 | ser_base_read_error_fd (scb, 0); | |
328 | } | |
329 | ||
9bcbdca8 PA |
330 | /* Read a character with user-specified timeout. TIMEOUT is number of |
331 | seconds to wait, or -1 to wait forever. Use timeout of 0 to effect | |
332 | a poll. Returns char if successful. Returns SERIAL_TIMEOUT if | |
333 | timeout expired, SERIAL_EOF if line dropped dead, or SERIAL_ERROR | |
334 | for any other error (see errno in that case). */ | |
b4505029 MM |
335 | |
336 | static int | |
337 | do_ser_base_readchar (struct serial *scb, int timeout) | |
338 | { | |
339 | int status; | |
340 | int delta; | |
341 | ||
342 | /* We have to be able to keep the GUI alive here, so we break the | |
343 | original timeout into steps of 1 second, running the "keep the | |
344 | GUI alive" hook each time through the loop. | |
345 | ||
346 | Also, timeout = 0 means to poll, so we just set the delta to 0, | |
347 | so we will only go through the loop once. */ | |
348 | ||
349 | delta = (timeout == 0 ? 0 : 1); | |
350 | while (1) | |
351 | { | |
352 | /* N.B. The UI may destroy our world (for instance by calling | |
353 | remote_stop,) in which case we want to get out of here as | |
354 | quickly as possible. It is not safe to touch scb, since | |
355 | someone else might have freed it. The | |
356 | deprecated_ui_loop_hook signals that we should exit by | |
357 | returning 1. */ | |
358 | ||
359 | if (deprecated_ui_loop_hook) | |
360 | { | |
361 | if (deprecated_ui_loop_hook (0)) | |
362 | return SERIAL_TIMEOUT; | |
363 | } | |
364 | ||
365 | status = ser_base_wait_for (scb, delta); | |
366 | if (timeout > 0) | |
367 | timeout -= delta; | |
368 | ||
369 | /* If we got a character or an error back from wait_for, then we can | |
c378eb4e | 370 | break from the loop before the timeout is completed. */ |
b4505029 MM |
371 | if (status != SERIAL_TIMEOUT) |
372 | break; | |
373 | ||
374 | /* If we have exhausted the original timeout, then generate | |
c378eb4e | 375 | a SERIAL_TIMEOUT, and pass it out of the loop. */ |
b4505029 MM |
376 | else if (timeout == 0) |
377 | { | |
378 | status = SERIAL_TIMEOUT; | |
379 | break; | |
380 | } | |
3347eb1a | 381 | |
382 | /* We also need to check and consume the stderr because it could | |
383 | come before the stdout for some stubs. If we just sit and wait | |
384 | for stdout, we would hit a deadlock for that case. */ | |
385 | ser_base_read_error_fd (scb, 0); | |
b4505029 MM |
386 | } |
387 | ||
388 | if (status < 0) | |
389 | return status; | |
390 | ||
75ee5925 PA |
391 | do |
392 | { | |
393 | status = scb->ops->read_prim (scb, BUFSIZ); | |
394 | } | |
395 | while (status < 0 && errno == EINTR); | |
b4505029 MM |
396 | |
397 | if (status <= 0) | |
398 | { | |
399 | if (status == 0) | |
d41ebd5d | 400 | return SERIAL_EOF; |
b4505029 MM |
401 | else |
402 | /* Got an error from read. */ | |
403 | return SERIAL_ERROR; | |
404 | } | |
405 | ||
406 | scb->bufcnt = status; | |
407 | scb->bufcnt--; | |
408 | scb->bufp = scb->buf; | |
409 | return *scb->bufp++; | |
410 | } | |
411 | ||
c378eb4e | 412 | /* Perform operations common to both old and new readchar. */ |
b4505029 MM |
413 | |
414 | /* Return the next character from the input FIFO. If the FIFO is | |
415 | empty, call the SERIAL specific routine to try and read in more | |
416 | characters. | |
417 | ||
418 | Initially data from the input FIFO is returned (fd_event() | |
419 | pre-reads the input into that FIFO. Once that has been emptied, | |
420 | further data is obtained by polling the input FD using the device | |
421 | specific readchar() function. Note: reschedule() is called after | |
422 | every read. This is because there is no guarentee that the lower | |
423 | level fd_event() poll_event() code (which also calls reschedule()) | |
c378eb4e | 424 | will be called. */ |
b4505029 MM |
425 | |
426 | int | |
427 | generic_readchar (struct serial *scb, int timeout, | |
428 | int (do_readchar) (struct serial *scb, int timeout)) | |
429 | { | |
430 | int ch; | |
431 | if (scb->bufcnt > 0) | |
432 | { | |
433 | ch = *scb->bufp; | |
434 | scb->bufcnt--; | |
435 | scb->bufp++; | |
436 | } | |
437 | else if (scb->bufcnt < 0) | |
438 | { | |
c378eb4e | 439 | /* Some errors/eof are are sticky. */ |
b4505029 MM |
440 | ch = scb->bufcnt; |
441 | } | |
442 | else | |
443 | { | |
444 | ch = do_readchar (scb, timeout); | |
445 | if (ch < 0) | |
446 | { | |
447 | switch ((enum serial_rc) ch) | |
448 | { | |
449 | case SERIAL_EOF: | |
450 | case SERIAL_ERROR: | |
c378eb4e | 451 | /* Make the error/eof stick. */ |
b4505029 MM |
452 | scb->bufcnt = ch; |
453 | break; | |
454 | case SERIAL_TIMEOUT: | |
455 | scb->bufcnt = 0; | |
456 | break; | |
457 | } | |
458 | } | |
459 | } | |
65cc4390 | 460 | |
3347eb1a | 461 | /* Read any error output we might have. */ |
462 | ser_base_read_error_fd (scb, 1); | |
65cc4390 | 463 | |
b4505029 MM |
464 | reschedule (scb); |
465 | return ch; | |
466 | } | |
467 | ||
468 | int | |
469 | ser_base_readchar (struct serial *scb, int timeout) | |
470 | { | |
471 | return generic_readchar (scb, timeout, do_ser_base_readchar); | |
472 | } | |
473 | ||
3eb25fda | 474 | int |
c628b528 | 475 | ser_base_write (struct serial *scb, const void *buf, size_t count) |
3eb25fda | 476 | { |
19ba03f4 | 477 | const char *str = (const char *) buf; |
3eb25fda MM |
478 | int cc; |
479 | ||
c628b528 | 480 | while (count > 0) |
3eb25fda | 481 | { |
048094ac PA |
482 | QUIT; |
483 | ||
c628b528 | 484 | cc = scb->ops->write_prim (scb, str, count); |
3eb25fda MM |
485 | |
486 | if (cc < 0) | |
75ee5925 PA |
487 | { |
488 | if (errno == EINTR) | |
489 | continue; | |
490 | return 1; | |
491 | } | |
c628b528 | 492 | count -= cc; |
3eb25fda MM |
493 | str += cc; |
494 | } | |
495 | return 0; | |
496 | } | |
497 | ||
498 | int | |
dd5da072 | 499 | ser_base_flush_output (struct serial *scb) |
3eb25fda MM |
500 | { |
501 | return 0; | |
502 | } | |
503 | ||
504 | int | |
dd5da072 | 505 | ser_base_flush_input (struct serial *scb) |
3eb25fda MM |
506 | { |
507 | if (scb->bufcnt >= 0) | |
508 | { | |
509 | scb->bufcnt = 0; | |
510 | scb->bufp = scb->buf; | |
511 | return 0; | |
512 | } | |
513 | else | |
514 | return SERIAL_ERROR; | |
515 | } | |
516 | ||
517 | int | |
dd5da072 | 518 | ser_base_send_break (struct serial *scb) |
3eb25fda MM |
519 | { |
520 | return 0; | |
521 | } | |
522 | ||
523 | int | |
dd5da072 | 524 | ser_base_drain_output (struct serial *scb) |
3eb25fda MM |
525 | { |
526 | return 0; | |
527 | } | |
528 | ||
529 | void | |
dd5da072 | 530 | ser_base_raw (struct serial *scb) |
3eb25fda | 531 | { |
c378eb4e | 532 | return; /* Always in raw mode. */ |
3eb25fda MM |
533 | } |
534 | ||
535 | serial_ttystate | |
dd5da072 | 536 | ser_base_get_tty_state (struct serial *scb) |
3eb25fda | 537 | { |
c378eb4e | 538 | /* Allocate a dummy. */ |
70ba0933 | 539 | return (serial_ttystate) XNEW (int); |
3eb25fda MM |
540 | } |
541 | ||
1e182ce8 UW |
542 | serial_ttystate |
543 | ser_base_copy_tty_state (struct serial *scb, serial_ttystate ttystate) | |
544 | { | |
545 | /* Allocate another dummy. */ | |
70ba0933 | 546 | return (serial_ttystate) XNEW (int); |
1e182ce8 UW |
547 | } |
548 | ||
3eb25fda | 549 | int |
dd5da072 | 550 | ser_base_set_tty_state (struct serial *scb, serial_ttystate ttystate) |
3eb25fda MM |
551 | { |
552 | return 0; | |
553 | } | |
554 | ||
3eb25fda | 555 | void |
dd5da072 MM |
556 | ser_base_print_tty_state (struct serial *scb, |
557 | serial_ttystate ttystate, | |
558 | struct ui_file *stream) | |
3eb25fda MM |
559 | { |
560 | /* Nothing to print. */ | |
561 | return; | |
562 | } | |
563 | ||
564 | int | |
dd5da072 | 565 | ser_base_setbaudrate (struct serial *scb, int rate) |
3eb25fda | 566 | { |
c378eb4e | 567 | return 0; /* Never fails! */ |
3eb25fda MM |
568 | } |
569 | ||
570 | int | |
dd5da072 | 571 | ser_base_setstopbits (struct serial *scb, int num) |
3eb25fda | 572 | { |
c378eb4e | 573 | return 0; /* Never fails! */ |
3eb25fda MM |
574 | } |
575 | ||
236af5e3 YG |
576 | /* Implement the "setparity" serial_ops callback. */ |
577 | ||
578 | int | |
579 | ser_base_setparity (struct serial *scb, int parity) | |
580 | { | |
581 | return 0; /* Never fails! */ | |
582 | } | |
583 | ||
3eb25fda MM |
584 | /* Put the SERIAL device into/out-of ASYNC mode. */ |
585 | ||
586 | void | |
dd5da072 | 587 | ser_base_async (struct serial *scb, |
3eb25fda MM |
588 | int async_p) |
589 | { | |
590 | if (async_p) | |
591 | { | |
c378eb4e | 592 | /* Force a re-schedule. */ |
3eb25fda MM |
593 | scb->async_state = NOTHING_SCHEDULED; |
594 | if (serial_debug_p (scb)) | |
595 | fprintf_unfiltered (gdb_stdlog, "[fd%d->asynchronous]\n", | |
596 | scb->fd); | |
597 | reschedule (scb); | |
a75868f5 PA |
598 | |
599 | if (scb->error_fd != -1) | |
600 | add_file_handler (scb->error_fd, handle_error_fd, scb); | |
3eb25fda MM |
601 | } |
602 | else | |
603 | { | |
604 | if (serial_debug_p (scb)) | |
605 | fprintf_unfiltered (gdb_stdlog, "[fd%d->synchronous]\n", | |
606 | scb->fd); | |
c378eb4e | 607 | /* De-schedule whatever tasks are currently scheduled. */ |
3eb25fda MM |
608 | switch (scb->async_state) |
609 | { | |
610 | case FD_SCHEDULED: | |
611 | delete_file_handler (scb->fd); | |
612 | break; | |
613 | case NOTHING_SCHEDULED: | |
614 | break; | |
615 | default: /* TIMER SCHEDULED */ | |
616 | delete_timer (scb->async_state); | |
617 | break; | |
618 | } | |
a75868f5 PA |
619 | |
620 | if (scb->error_fd != -1) | |
621 | delete_file_handler (scb->error_fd); | |
3eb25fda MM |
622 | } |
623 | } |