Commit | Line | Data |
---|---|---|
b5a0ac70 | 1 | /* Top level stuff for GDB, the GNU debugger. |
637537d0 | 2 | |
618f726f | 3 | Copyright (C) 1999-2016 Free Software Foundation, Inc. |
637537d0 | 4 | |
b5a0ac70 SS |
5 | Written by Elena Zannoni <ezannoni@cygnus.com> of Cygnus Solutions. |
6 | ||
7 | This file is part of GDB. | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 11 | the Free Software Foundation; either version 3 of the License, or |
b5a0ac70 SS |
12 | (at your option) any later version. |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
371d5dec | 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
b5a0ac70 SS |
21 | |
22 | #include "defs.h" | |
0f71a2f6 | 23 | #include "top.h" |
b5a0ac70 | 24 | #include "inferior.h" |
45741a9c | 25 | #include "infrun.h" |
e514a9d6 | 26 | #include "target.h" |
c5aa993b | 27 | #include "terminal.h" /* for job_control */ |
9e0b60a8 | 28 | #include "event-loop.h" |
c2c6d25f | 29 | #include "event-top.h" |
4389a95a | 30 | #include "interps.h" |
042be3a9 | 31 | #include <signal.h> |
16026cd7 | 32 | #include "cli/cli-script.h" /* for reset_command_nest_depth */ |
d01a8610 | 33 | #include "main.h" |
8ea051c5 | 34 | #include "gdbthread.h" |
d17b6f81 | 35 | #include "observer.h" |
be34f849 | 36 | #include "continuations.h" |
371d5dec | 37 | #include "gdbcmd.h" /* for dont_repeat() */ |
bd00c694 | 38 | #include "annotate.h" |
bd712aed | 39 | #include "maint.h" |
187212b3 | 40 | #include "buffer.h" |
f0881b37 PA |
41 | #include "ser-event.h" |
42 | #include "gdb_select.h" | |
104c1213 | 43 | |
371d5dec | 44 | /* readline include files. */ |
dbda9972 AC |
45 | #include "readline/readline.h" |
46 | #include "readline/history.h" | |
b5a0ac70 SS |
47 | |
48 | /* readline defines this. */ | |
49 | #undef savestring | |
50 | ||
c2c6d25f | 51 | static void command_line_handler (char *rl); |
c2c6d25f | 52 | static void change_line_handler (void); |
ab821bc6 | 53 | static char *top_level_prompt (void); |
b5a0ac70 | 54 | |
371d5dec | 55 | /* Signal handlers. */ |
6d318c73 | 56 | #ifdef SIGQUIT |
c2c6d25f | 57 | static void handle_sigquit (int sig); |
6d318c73 | 58 | #endif |
0f0b8dcd | 59 | #ifdef SIGHUP |
c2c6d25f | 60 | static void handle_sighup (int sig); |
0f0b8dcd | 61 | #endif |
c2c6d25f | 62 | static void handle_sigfpe (int sig); |
b5a0ac70 SS |
63 | |
64 | /* Functions to be invoked by the event loop in response to | |
371d5dec | 65 | signals. */ |
0f0b8dcd | 66 | #if defined (SIGQUIT) || defined (SIGHUP) |
c2c6d25f | 67 | static void async_do_nothing (gdb_client_data); |
0f0b8dcd DJ |
68 | #endif |
69 | #ifdef SIGHUP | |
c2c6d25f | 70 | static void async_disconnect (gdb_client_data); |
0f0b8dcd | 71 | #endif |
c2c6d25f | 72 | static void async_float_handler (gdb_client_data); |
0f0b8dcd | 73 | #ifdef STOP_SIGNAL |
c2c6d25f | 74 | static void async_stop_sig (gdb_client_data); |
0f0b8dcd | 75 | #endif |
06c868a8 | 76 | static void async_sigterm_handler (gdb_client_data arg); |
b5a0ac70 | 77 | |
a74e1786 PA |
78 | /* Instead of invoking (and waiting for) readline to read the command |
79 | line and pass it back for processing, we use readline's alternate | |
80 | interface, via callback functions, so that the event loop can react | |
81 | to other event sources while we wait for input. */ | |
b5a0ac70 | 82 | |
371d5dec | 83 | /* Important variables for the event loop. */ |
b5a0ac70 SS |
84 | |
85 | /* This is used to determine if GDB is using the readline library or | |
371d5dec | 86 | its own simplified form of readline. It is used by the asynchronous |
0f71a2f6 | 87 | form of the set editing command. |
392a587b | 88 | ezannoni: as of 1999-04-29 I expect that this |
b5a0ac70 | 89 | variable will not be used after gdb is changed to use the event |
371d5dec | 90 | loop as default engine, and event-top.c is merged into top.c. */ |
b5a0ac70 SS |
91 | int async_command_editing_p; |
92 | ||
104c1213 | 93 | /* This is used to display the notification of the completion of an |
371d5dec | 94 | asynchronous execution command. */ |
104c1213 JM |
95 | int exec_done_display_p = 0; |
96 | ||
d64e57fa PP |
97 | /* Used by the stdin event handler to compensate for missed stdin events. |
98 | Setting this to a non-zero value inside an stdin callback makes the callback | |
99 | run again. */ | |
100 | int call_stdin_event_handler_again_p; | |
101 | ||
371d5dec | 102 | /* Signal handling variables. */ |
b5a0ac70 | 103 | /* Each of these is a pointer to a function that the event loop will |
371d5dec | 104 | invoke if the corresponding signal has received. The real signal |
b5a0ac70 | 105 | handlers mark these functions as ready to be executed and the event |
371d5dec MS |
106 | loop, in a later iteration, calls them. See the function |
107 | invoke_async_signal_handler. */ | |
05fa9251 | 108 | static struct async_signal_handler *sigint_token; |
b5a0ac70 | 109 | #ifdef SIGHUP |
05fa9251 | 110 | static struct async_signal_handler *sighup_token; |
b5a0ac70 | 111 | #endif |
6d318c73 | 112 | #ifdef SIGQUIT |
05fa9251 | 113 | static struct async_signal_handler *sigquit_token; |
6d318c73 | 114 | #endif |
05fa9251 | 115 | static struct async_signal_handler *sigfpe_token; |
0f71a2f6 | 116 | #ifdef STOP_SIGNAL |
05fa9251 | 117 | static struct async_signal_handler *sigtstp_token; |
0f71a2f6 | 118 | #endif |
06c868a8 | 119 | static struct async_signal_handler *async_sigterm_token; |
0f71a2f6 | 120 | |
3c610247 | 121 | /* This hook is called by gdb_rl_callback_read_char_wrapper after each |
467d8519 | 122 | character is processed. */ |
b08ee6a2 | 123 | void (*after_char_processing_hook) (void); |
b5a0ac70 SS |
124 | \f |
125 | ||
89525768 PA |
126 | /* Wrapper function for calling into the readline library. This takes |
127 | care of a couple things: | |
128 | ||
129 | - The event loop expects the callback function to have a parameter, | |
130 | while readline expects none. | |
131 | ||
132 | - Propagation of GDB exceptions/errors thrown from INPUT_HANDLER | |
133 | across readline requires special handling. | |
134 | ||
135 | On the exceptions issue: | |
136 | ||
137 | DWARF-based unwinding cannot cross code built without -fexceptions. | |
138 | Any exception that tries to propagate through such code will fail | |
139 | and the result is a call to std::terminate. While some ABIs, such | |
140 | as x86-64, require all code to be built with exception tables, | |
141 | others don't. | |
142 | ||
143 | This is a problem when GDB calls some non-EH-aware C library code, | |
144 | that calls into GDB again through a callback, and that GDB callback | |
145 | code throws a C++ exception. Turns out this is exactly what | |
146 | happens with GDB's readline callback. | |
147 | ||
148 | In such cases, we must catch and save any C++ exception that might | |
149 | be thrown from the GDB callback before returning to the | |
150 | non-EH-aware code. When the non-EH-aware function itself returns | |
151 | back to GDB, we then rethrow the original C++ exception. | |
152 | ||
153 | In the readline case however, the right thing to do is to longjmp | |
154 | out of the callback, rather than do a normal return -- there's no | |
155 | way for the callback to return to readline an indication that an | |
156 | error happened, so a normal return would have rl_callback_read_char | |
157 | potentially continue processing further input, redisplay the | |
158 | prompt, etc. Instead of raw setjmp/longjmp however, we use our | |
159 | sjlj-based TRY/CATCH mechanism, which knows to handle multiple | |
160 | levels of active setjmp/longjmp frames, needed in order to handle | |
161 | the readline callback recursing, as happens with e.g., secondary | |
162 | prompts / queries, through gdb_readline_wrapper. */ | |
163 | ||
c2c6d25f | 164 | static void |
3c610247 | 165 | gdb_rl_callback_read_char_wrapper (gdb_client_data client_data) |
c2c6d25f | 166 | { |
89525768 PA |
167 | struct gdb_exception gdb_expt = exception_none; |
168 | ||
169 | /* C++ exceptions can't normally be thrown across readline (unless | |
170 | it is built with -fexceptions, but it won't by default on many | |
171 | ABIs). So we instead wrap the readline call with a sjlj-based | |
172 | TRY/CATCH, and rethrow the GDB exception once back in GDB. */ | |
173 | TRY_SJLJ | |
174 | { | |
175 | rl_callback_read_char (); | |
176 | if (after_char_processing_hook) | |
177 | (*after_char_processing_hook) (); | |
178 | } | |
179 | CATCH_SJLJ (ex, RETURN_MASK_ALL) | |
180 | { | |
181 | gdb_expt = ex; | |
182 | } | |
183 | END_CATCH_SJLJ | |
184 | ||
185 | /* Rethrow using the normal EH mechanism. */ | |
186 | if (gdb_expt.reason < 0) | |
187 | throw_exception (gdb_expt); | |
188 | } | |
189 | ||
190 | /* GDB's readline callback handler. Calls the current INPUT_HANDLER, | |
191 | and propagates GDB exceptions/errors thrown from INPUT_HANDLER back | |
192 | across readline. See gdb_rl_callback_read_char_wrapper. */ | |
193 | ||
194 | static void | |
195 | gdb_rl_callback_handler (char *rl) | |
196 | { | |
197 | struct gdb_exception gdb_rl_expt = exception_none; | |
a74e1786 | 198 | struct ui *ui = current_ui; |
89525768 PA |
199 | |
200 | TRY | |
201 | { | |
a74e1786 | 202 | ui->input_handler (rl); |
89525768 PA |
203 | } |
204 | CATCH (ex, RETURN_MASK_ALL) | |
205 | { | |
206 | gdb_rl_expt = ex; | |
207 | } | |
208 | END_CATCH | |
209 | ||
210 | /* If we caught a GDB exception, longjmp out of the readline | |
211 | callback. There's no other way for the callback to signal to | |
212 | readline that an error happened. A normal return would have | |
213 | readline potentially continue processing further input, redisplay | |
214 | the prompt, etc. (This is what GDB historically did when it was | |
215 | a C program.) Note that since we're long jumping, local variable | |
216 | dtors are NOT run automatically. */ | |
217 | if (gdb_rl_expt.reason < 0) | |
218 | throw_exception_sjlj (gdb_rl_expt); | |
c2c6d25f JM |
219 | } |
220 | ||
b5a0ac70 | 221 | /* Initialize all the necessary variables, start the event loop, |
4d09c5b4 AB |
222 | register readline, and stdin, start the loop. The DATA is the |
223 | interpreter data cookie, ignored for now. */ | |
224 | ||
b5a0ac70 | 225 | void |
4d09c5b4 | 226 | cli_command_loop (void *data) |
b5a0ac70 | 227 | { |
7d8e6458 | 228 | display_gdb_prompt (0); |
b5a0ac70 | 229 | |
371d5dec | 230 | /* Now it's time to start the event loop. */ |
085dd6e6 | 231 | start_event_loop (); |
b5a0ac70 SS |
232 | } |
233 | ||
234 | /* Change the function to be invoked every time there is a character | |
371d5dec | 235 | ready on stdin. This is used when the user sets the editing off, |
b5a0ac70 | 236 | therefore bypassing readline, and letting gdb handle the input |
c70061cf PA |
237 | itself, via gdb_readline_no_editing_callback. Also it is used in |
238 | the opposite case in which the user sets editing on again, by | |
239 | restoring readline handling of the input. */ | |
392a587b | 240 | static void |
c2c6d25f | 241 | change_line_handler (void) |
b5a0ac70 | 242 | { |
a74e1786 PA |
243 | struct ui *ui = current_ui; |
244 | ||
371d5dec MS |
245 | /* NOTE: this operates on input_fd, not instream. If we are reading |
246 | commands from a file, instream will point to the file. However in | |
c2c6d25f | 247 | async mode, we always read commands from a file with editing |
371d5dec MS |
248 | off. This means that the 'set editing on/off' will have effect |
249 | only on the interactive session. */ | |
c2c6d25f | 250 | |
b5a0ac70 SS |
251 | if (async_command_editing_p) |
252 | { | |
371d5dec | 253 | /* Turn on editing by using readline. */ |
a74e1786 PA |
254 | ui->call_readline = gdb_rl_callback_read_char_wrapper; |
255 | ui->input_handler = command_line_handler; | |
b5a0ac70 SS |
256 | } |
257 | else | |
258 | { | |
c70061cf | 259 | /* Turn off editing by using gdb_readline_no_editing_callback. */ |
d3d4baed | 260 | gdb_rl_callback_handler_remove (); |
a74e1786 | 261 | ui->call_readline = gdb_readline_no_editing_callback; |
0f71a2f6 JM |
262 | |
263 | /* Set up the command handler as well, in case we are called as | |
371d5dec | 264 | first thing from .gdbinit. */ |
a74e1786 | 265 | ui->input_handler = command_line_handler; |
b5a0ac70 | 266 | } |
b5a0ac70 SS |
267 | } |
268 | ||
d3d4baed PA |
269 | /* The functions below are wrappers for rl_callback_handler_remove and |
270 | rl_callback_handler_install that keep track of whether the callback | |
271 | handler is installed in readline. This is necessary because after | |
272 | handling a target event of a background execution command, we may | |
273 | need to reinstall the callback handler if it was removed due to a | |
274 | secondary prompt. See gdb_readline_wrapper_line. We don't | |
275 | unconditionally install the handler for every target event because | |
276 | that also clears the line buffer, thus installing it while the user | |
277 | is typing would lose input. */ | |
278 | ||
279 | /* Whether we've registered a callback handler with readline. */ | |
280 | static int callback_handler_installed; | |
281 | ||
282 | /* See event-top.h, and above. */ | |
283 | ||
284 | void | |
285 | gdb_rl_callback_handler_remove (void) | |
286 | { | |
287 | rl_callback_handler_remove (); | |
288 | callback_handler_installed = 0; | |
289 | } | |
290 | ||
291 | /* See event-top.h, and above. Note this wrapper doesn't have an | |
292 | actual callback parameter because we always install | |
293 | INPUT_HANDLER. */ | |
294 | ||
295 | void | |
296 | gdb_rl_callback_handler_install (const char *prompt) | |
297 | { | |
298 | /* Calling rl_callback_handler_install resets readline's input | |
299 | buffer. Calling this when we were already processing input | |
300 | therefore loses input. */ | |
301 | gdb_assert (!callback_handler_installed); | |
302 | ||
89525768 | 303 | rl_callback_handler_install (prompt, gdb_rl_callback_handler); |
d3d4baed PA |
304 | callback_handler_installed = 1; |
305 | } | |
306 | ||
307 | /* See event-top.h, and above. */ | |
308 | ||
309 | void | |
310 | gdb_rl_callback_handler_reinstall (void) | |
311 | { | |
312 | if (!callback_handler_installed) | |
313 | { | |
314 | /* Passing NULL as prompt argument tells readline to not display | |
315 | a prompt. */ | |
316 | gdb_rl_callback_handler_install (NULL); | |
317 | } | |
318 | } | |
319 | ||
ab821bc6 PA |
320 | /* Displays the prompt. If the argument NEW_PROMPT is NULL, the |
321 | prompt that is displayed is the current top level prompt. | |
322 | Otherwise, it displays whatever NEW_PROMPT is as a local/secondary | |
323 | prompt. | |
324 | ||
325 | This is used after each gdb command has completed, and in the | |
326 | following cases: | |
327 | ||
371d5dec | 328 | 1. When the user enters a command line which is ended by '\' |
ab821bc6 PA |
329 | indicating that the command will continue on the next line. In |
330 | that case the prompt that is displayed is the empty string. | |
331 | ||
0f71a2f6 | 332 | 2. When the user is entering 'commands' for a breakpoint, or |
371d5dec | 333 | actions for a tracepoint. In this case the prompt will be '>' |
ab821bc6 PA |
334 | |
335 | 3. On prompting for pagination. */ | |
336 | ||
b5a0ac70 | 337 | void |
38bcc89d | 338 | display_gdb_prompt (const char *new_prompt) |
b5a0ac70 | 339 | { |
d17b6f81 | 340 | char *actual_gdb_prompt = NULL; |
ab821bc6 | 341 | struct cleanup *old_chain; |
b5a0ac70 | 342 | |
bd00c694 PA |
343 | annotate_display_prompt (); |
344 | ||
16026cd7 AS |
345 | /* Reset the nesting depth used when trace-commands is set. */ |
346 | reset_command_nest_depth (); | |
347 | ||
ab821bc6 | 348 | old_chain = make_cleanup (free_current_contents, &actual_gdb_prompt); |
d17b6f81 | 349 | |
ab821bc6 PA |
350 | /* Do not call the python hook on an explicit prompt change as |
351 | passed to this function, as this forms a secondary/local prompt, | |
352 | IE, displayed but not set. */ | |
353 | if (! new_prompt) | |
adf40b2e | 354 | { |
ab821bc6 | 355 | if (sync_execution) |
d17b6f81 | 356 | { |
ab821bc6 PA |
357 | /* This is to trick readline into not trying to display the |
358 | prompt. Even though we display the prompt using this | |
359 | function, readline still tries to do its own display if | |
360 | we don't call rl_callback_handler_install and | |
361 | rl_callback_handler_remove (which readline detects | |
362 | because a global variable is not set). If readline did | |
363 | that, it could mess up gdb signal handlers for SIGINT. | |
364 | Readline assumes that between calls to rl_set_signals and | |
365 | rl_clear_signals gdb doesn't do anything with the signal | |
366 | handlers. Well, that's not the case, because when the | |
367 | target executes we change the SIGINT signal handler. If | |
368 | we allowed readline to display the prompt, the signal | |
369 | handler change would happen exactly between the calls to | |
370 | the above two functions. Calling | |
371 | rl_callback_handler_remove(), does the job. */ | |
372 | ||
d3d4baed | 373 | gdb_rl_callback_handler_remove (); |
faab9922 | 374 | do_cleanups (old_chain); |
ab821bc6 | 375 | return; |
d17b6f81 PM |
376 | } |
377 | else | |
ab821bc6 PA |
378 | { |
379 | /* Display the top level prompt. */ | |
380 | actual_gdb_prompt = top_level_prompt (); | |
381 | } | |
b5a0ac70 | 382 | } |
ab821bc6 PA |
383 | else |
384 | actual_gdb_prompt = xstrdup (new_prompt); | |
b5a0ac70 SS |
385 | |
386 | if (async_command_editing_p) | |
387 | { | |
d3d4baed PA |
388 | gdb_rl_callback_handler_remove (); |
389 | gdb_rl_callback_handler_install (actual_gdb_prompt); | |
b5a0ac70 | 390 | } |
371d5dec | 391 | /* new_prompt at this point can be the top of the stack or the one |
d014929c MS |
392 | passed in. It can't be NULL. */ |
393 | else | |
b5a0ac70 SS |
394 | { |
395 | /* Don't use a _filtered function here. It causes the assumed | |
396 | character position to be off, since the newline we read from | |
397 | the user is not accounted for. */ | |
d17b6f81 | 398 | fputs_unfiltered (actual_gdb_prompt, gdb_stdout); |
b5a0ac70 SS |
399 | gdb_flush (gdb_stdout); |
400 | } | |
ab821bc6 PA |
401 | |
402 | do_cleanups (old_chain); | |
b5a0ac70 SS |
403 | } |
404 | ||
ab821bc6 PA |
405 | /* Return the top level prompt, as specified by "set prompt", possibly |
406 | overriden by the python gdb.prompt_hook hook, and then composed | |
407 | with the prompt prefix and suffix (annotations). The caller is | |
408 | responsible for freeing the returned string. */ | |
409 | ||
410 | static char * | |
411 | top_level_prompt (void) | |
b5a0ac70 | 412 | { |
608ff013 | 413 | char *prompt; |
b5a0ac70 | 414 | |
ab821bc6 PA |
415 | /* Give observers a chance of changing the prompt. E.g., the python |
416 | `gdb.prompt_hook' is installed as an observer. */ | |
417 | observer_notify_before_prompt (get_prompt ()); | |
418 | ||
608ff013 | 419 | prompt = get_prompt (); |
b5a0ac70 | 420 | |
ab821bc6 | 421 | if (annotation_level >= 2) |
b5a0ac70 | 422 | { |
ab821bc6 | 423 | /* Prefix needs to have new line at end. */ |
608ff013 | 424 | const char prefix[] = "\n\032\032pre-prompt\n"; |
ab821bc6 PA |
425 | |
426 | /* Suffix needs to have a new line at end and \032 \032 at | |
427 | beginning. */ | |
608ff013 | 428 | const char suffix[] = "\n\032\032prompt\n"; |
b5a0ac70 | 429 | |
b36cec19 | 430 | return concat (prefix, prompt, suffix, (char *) NULL); |
608ff013 | 431 | } |
ab821bc6 | 432 | |
608ff013 | 433 | return xstrdup (prompt); |
b5a0ac70 | 434 | } |
c2c6d25f | 435 | |
7c36c34e | 436 | /* The main UI. */ |
73ab01a0 PA |
437 | static struct ui main_ui_; |
438 | ||
7c36c34e | 439 | struct ui *main_ui = &main_ui_; |
73ab01a0 PA |
440 | struct ui *current_ui = &main_ui_; |
441 | struct ui *ui_list = &main_ui_; | |
442 | ||
443 | /* Cleanup that restores the current UI. */ | |
444 | ||
445 | static void | |
446 | restore_ui_cleanup (void *data) | |
447 | { | |
448 | current_ui = (struct ui *) data; | |
449 | } | |
450 | ||
451 | /* See top.h. */ | |
452 | ||
453 | void | |
454 | switch_thru_all_uis_init (struct switch_thru_all_uis *state) | |
455 | { | |
456 | state->iter = ui_list; | |
457 | state->old_chain = make_cleanup (restore_ui_cleanup, current_ui); | |
458 | } | |
459 | ||
460 | /* See top.h. */ | |
461 | ||
462 | int | |
463 | switch_thru_all_uis_cond (struct switch_thru_all_uis *state) | |
464 | { | |
465 | if (state->iter != NULL) | |
466 | { | |
467 | current_ui = state->iter; | |
468 | return 1; | |
469 | } | |
470 | else | |
471 | { | |
472 | do_cleanups (state->old_chain); | |
473 | return 0; | |
474 | } | |
475 | } | |
476 | ||
477 | /* See top.h. */ | |
478 | ||
479 | void | |
480 | switch_thru_all_uis_next (struct switch_thru_all_uis *state) | |
481 | { | |
482 | state->iter = state->iter->next; | |
483 | } | |
a74e1786 PA |
484 | |
485 | /* Get a pointer to the current UI's line buffer. This is used to | |
b69d38af PA |
486 | construct a whole line of input from partial input. */ |
487 | ||
488 | static struct buffer * | |
489 | get_command_line_buffer (void) | |
490 | { | |
a74e1786 | 491 | return ¤t_ui->line_buffer; |
b69d38af PA |
492 | } |
493 | ||
187212b3 | 494 | /* When there is an event ready on the stdin file descriptor, instead |
c2c6d25f | 495 | of calling readline directly throught the callback function, or |
c70061cf PA |
496 | instead of calling gdb_readline_no_editing_callback, give gdb a |
497 | chance to detect errors and do something. */ | |
498 | ||
c2c6d25f | 499 | void |
2acceee2 | 500 | stdin_event_handler (int error, gdb_client_data client_data) |
c2c6d25f | 501 | { |
41fd2b0f PA |
502 | struct ui *ui = (struct ui *) client_data; |
503 | ||
504 | /* Switch to the UI whose input descriptor woke up the event | |
505 | loop. */ | |
506 | current_ui = ui; | |
a74e1786 | 507 | |
c2c6d25f JM |
508 | if (error) |
509 | { | |
a3f17187 | 510 | printf_unfiltered (_("error detected on stdin\n")); |
41fd2b0f | 511 | delete_file_handler (ui->input_fd); |
371d5dec | 512 | /* If stdin died, we may as well kill gdb. */ |
f38d3ad1 | 513 | quit_command ((char *) 0, stdin == ui->instream); |
c2c6d25f JM |
514 | } |
515 | else | |
d64e57fa | 516 | { |
d2acc30b PA |
517 | /* This makes sure a ^C immediately followed by further input is |
518 | always processed in that order. E.g,. with input like | |
519 | "^Cprint 1\n", the SIGINT handler runs, marks the async signal | |
520 | handler, and then select/poll may return with stdin ready, | |
521 | instead of -1/EINTR. The | |
522 | gdb.base/double-prompt-target-event-error.exp test exercises | |
523 | this. */ | |
524 | QUIT; | |
525 | ||
d64e57fa PP |
526 | do |
527 | { | |
528 | call_stdin_event_handler_again_p = 0; | |
a74e1786 | 529 | ui->call_readline (client_data); |
d64e57fa PP |
530 | } while (call_stdin_event_handler_again_p != 0); |
531 | } | |
c2c6d25f JM |
532 | } |
533 | ||
6426a772 JM |
534 | /* Re-enable stdin after the end of an execution command in |
535 | synchronous mode, or after an error from the target, and we aborted | |
371d5dec | 536 | the exec operation. */ |
6426a772 JM |
537 | |
538 | void | |
712af3be | 539 | async_enable_stdin (void) |
6426a772 | 540 | { |
32c1e744 VP |
541 | if (sync_execution) |
542 | { | |
371d5dec | 543 | /* See NOTE in async_disable_stdin(). */ |
32c1e744 VP |
544 | /* FIXME: cagney/1999-09-27: Call this before clearing |
545 | sync_execution. Current target_terminal_ours() implementations | |
371d5dec | 546 | check for sync_execution before switching the terminal. */ |
32c1e744 | 547 | target_terminal_ours (); |
32c1e744 VP |
548 | sync_execution = 0; |
549 | } | |
6426a772 JM |
550 | } |
551 | ||
552 | /* Disable reads from stdin (the console) marking the command as | |
371d5dec | 553 | synchronous. */ |
6426a772 JM |
554 | |
555 | void | |
556 | async_disable_stdin (void) | |
557 | { | |
ab821bc6 | 558 | sync_execution = 1; |
6426a772 | 559 | } |
b5a0ac70 | 560 | \f |
6426a772 | 561 | |
b69d38af PA |
562 | /* Handle a gdb command line. This function is called when |
563 | handle_line_of_input has concatenated one or more input lines into | |
564 | a whole command. */ | |
565 | ||
566 | void | |
c2c6d25f | 567 | command_handler (char *command) |
b5a0ac70 | 568 | { |
f38d3ad1 | 569 | struct ui *ui = current_ui; |
0f3bb72e | 570 | struct cleanup *stat_chain; |
b69d38af | 571 | char *c; |
b5a0ac70 | 572 | |
f38d3ad1 | 573 | if (ui->instream == stdin) |
b5a0ac70 | 574 | reinitialize_more_filter (); |
b5a0ac70 | 575 | |
0f3bb72e | 576 | stat_chain = make_command_stats_cleanup (1); |
b5a0ac70 | 577 | |
b69d38af PA |
578 | /* Do not execute commented lines. */ |
579 | for (c = command; *c == ' ' || *c == '\t'; c++) | |
580 | ; | |
581 | if (c[0] != '#') | |
582 | { | |
f38d3ad1 | 583 | execute_command (command, ui->instream == stdin); |
c5aa993b | 584 | |
b69d38af PA |
585 | /* Do any commands attached to breakpoint we stopped at. */ |
586 | bpstat_do_actions (); | |
587 | } | |
c5aa993b | 588 | |
0f3bb72e | 589 | do_cleanups (stat_chain); |
43ff13b4 JM |
590 | } |
591 | ||
b69d38af PA |
592 | /* Append RL, an input line returned by readline or one of its |
593 | emulations, to CMD_LINE_BUFFER. Returns the command line if we | |
594 | have a whole command line ready to be processed by the command | |
595 | interpreter or NULL if the command line isn't complete yet (input | |
596 | line ends in a backslash). Takes ownership of RL. */ | |
b5a0ac70 | 597 | |
b69d38af PA |
598 | static char * |
599 | command_line_append_input_line (struct buffer *cmd_line_buffer, char *rl) | |
b5a0ac70 | 600 | { |
b69d38af PA |
601 | char *cmd; |
602 | size_t len; | |
b5a0ac70 | 603 | |
b69d38af | 604 | len = strlen (rl); |
b5a0ac70 | 605 | |
b69d38af | 606 | if (len > 0 && rl[len - 1] == '\\') |
b5a0ac70 | 607 | { |
b69d38af PA |
608 | /* Don't copy the backslash and wait for more. */ |
609 | buffer_grow (cmd_line_buffer, rl, len - 1); | |
610 | cmd = NULL; | |
b5a0ac70 | 611 | } |
b69d38af | 612 | else |
b5a0ac70 | 613 | { |
b69d38af PA |
614 | /* Copy whole line including terminating null, and we're |
615 | done. */ | |
616 | buffer_grow (cmd_line_buffer, rl, len + 1); | |
617 | cmd = cmd_line_buffer->buffer; | |
b5a0ac70 SS |
618 | } |
619 | ||
b69d38af PA |
620 | /* Allocated in readline. */ |
621 | xfree (rl); | |
b5a0ac70 | 622 | |
b69d38af PA |
623 | return cmd; |
624 | } | |
b5a0ac70 | 625 | |
b69d38af | 626 | /* Handle a line of input coming from readline. |
b5a0ac70 | 627 | |
b69d38af PA |
628 | If the read line ends with a continuation character (backslash), |
629 | save the partial input in CMD_LINE_BUFFER (except the backslash), | |
630 | and return NULL. Otherwise, save the partial input and return a | |
631 | pointer to CMD_LINE_BUFFER's buffer (null terminated), indicating a | |
632 | whole command line is ready to be executed. | |
b5a0ac70 | 633 | |
b69d38af | 634 | Returns EOF on end of file. |
b5a0ac70 | 635 | |
b69d38af | 636 | If REPEAT, handle command repetitions: |
b5a0ac70 | 637 | |
b69d38af PA |
638 | - If the input command line is NOT empty, the command returned is |
639 | copied into the global 'saved_command_line' var so that it can | |
640 | be repeated later. | |
d96429cd | 641 | |
b69d38af PA |
642 | - OTOH, if the input command line IS empty, return the previously |
643 | saved command instead of the empty input line. | |
644 | */ | |
b5a0ac70 | 645 | |
b69d38af PA |
646 | char * |
647 | handle_line_of_input (struct buffer *cmd_line_buffer, | |
648 | char *rl, int repeat, char *annotation_suffix) | |
649 | { | |
f38d3ad1 | 650 | struct ui *ui = current_ui; |
b69d38af PA |
651 | char *p1; |
652 | char *cmd; | |
653 | ||
654 | if (rl == NULL) | |
655 | return (char *) EOF; | |
656 | ||
657 | cmd = command_line_append_input_line (cmd_line_buffer, rl); | |
658 | if (cmd == NULL) | |
659 | return NULL; | |
b5a0ac70 | 660 | |
b69d38af PA |
661 | /* We have a complete command line now. Prepare for the next |
662 | command, but leave ownership of memory to the buffer . */ | |
663 | cmd_line_buffer->used_size = 0; | |
664 | ||
f38d3ad1 | 665 | if (annotation_level > 1 && ui->instream == stdin) |
b5a0ac70 | 666 | { |
b69d38af PA |
667 | printf_unfiltered (("\n\032\032post-")); |
668 | puts_unfiltered (annotation_suffix); | |
669 | printf_unfiltered (("\n")); | |
670 | } | |
671 | ||
672 | #define SERVER_COMMAND_PREFIX "server " | |
673 | if (startswith (cmd, SERVER_COMMAND_PREFIX)) | |
674 | { | |
675 | /* Note that we don't set `saved_command_line'. Between this | |
676 | and the check in dont_repeat, this insures that repeating | |
677 | will still do the right thing. */ | |
678 | return cmd + strlen (SERVER_COMMAND_PREFIX); | |
b5a0ac70 SS |
679 | } |
680 | ||
681 | /* Do history expansion if that is wished. */ | |
f38d3ad1 PA |
682 | if (history_expansion_p && ui->instream == stdin |
683 | && ISATTY (ui->instream)) | |
b5a0ac70 SS |
684 | { |
685 | char *history_value; | |
686 | int expanded; | |
687 | ||
b69d38af | 688 | expanded = history_expand (cmd, &history_value); |
b5a0ac70 SS |
689 | if (expanded) |
690 | { | |
b69d38af PA |
691 | size_t len; |
692 | ||
b5a0ac70 SS |
693 | /* Print the changes. */ |
694 | printf_unfiltered ("%s\n", history_value); | |
695 | ||
696 | /* If there was an error, call this function again. */ | |
697 | if (expanded < 0) | |
698 | { | |
b8c9b27d | 699 | xfree (history_value); |
b69d38af | 700 | return cmd; |
b5a0ac70 | 701 | } |
b69d38af PA |
702 | |
703 | /* history_expand returns an allocated string. Just replace | |
704 | our buffer with it. */ | |
705 | len = strlen (history_value); | |
706 | xfree (buffer_finish (cmd_line_buffer)); | |
707 | cmd_line_buffer->buffer = history_value; | |
708 | cmd_line_buffer->buffer_size = len + 1; | |
709 | cmd = history_value; | |
b5a0ac70 SS |
710 | } |
711 | } | |
712 | ||
371d5dec | 713 | /* If we just got an empty line, and that is supposed to repeat the |
b69d38af PA |
714 | previous command, return the previously saved command. */ |
715 | for (p1 = cmd; *p1 == ' ' || *p1 == '\t'; p1++) | |
716 | ; | |
717 | if (repeat && *p1 == '\0') | |
718 | return saved_command_line; | |
719 | ||
720 | /* Add command to history if appropriate. Note: lines consisting | |
721 | solely of comments are also added to the command history. This | |
722 | is useful when you type a command, and then realize you don't | |
723 | want to execute it quite yet. You can comment out the command | |
724 | and then later fetch it from the value history and remove the | |
725 | '#'. The kill ring is probably better, but some people are in | |
726 | the habit of commenting things out. */ | |
727 | if (*cmd != '\0' && input_from_terminal_p ()) | |
728 | gdb_add_history (cmd); | |
b5a0ac70 | 729 | |
b69d38af PA |
730 | /* Save into global buffer if appropriate. */ |
731 | if (repeat) | |
b5a0ac70 | 732 | { |
b69d38af PA |
733 | xfree (saved_command_line); |
734 | saved_command_line = xstrdup (cmd); | |
735 | return saved_command_line; | |
b5a0ac70 | 736 | } |
b69d38af PA |
737 | else |
738 | return cmd; | |
739 | } | |
b5a0ac70 | 740 | |
b69d38af PA |
741 | /* Handle a complete line of input. This is called by the callback |
742 | mechanism within the readline library. Deal with incomplete | |
743 | commands as well, by saving the partial input in a global | |
744 | buffer. | |
b5a0ac70 | 745 | |
b69d38af PA |
746 | NOTE: This is the asynchronous version of the command_line_input |
747 | function. */ | |
b5a0ac70 | 748 | |
b69d38af PA |
749 | void |
750 | command_line_handler (char *rl) | |
751 | { | |
752 | struct buffer *line_buffer = get_command_line_buffer (); | |
f38d3ad1 | 753 | struct ui *ui = current_ui; |
b69d38af | 754 | char *cmd; |
b5a0ac70 | 755 | |
f38d3ad1 PA |
756 | cmd = handle_line_of_input (line_buffer, rl, ui->instream == stdin, |
757 | "prompt"); | |
b69d38af | 758 | if (cmd == (char *) EOF) |
b5a0ac70 | 759 | { |
b69d38af PA |
760 | /* stdin closed. The connection with the terminal is gone. |
761 | This happens at the end of a testsuite run, after Expect has | |
762 | hung up but GDB is still alive. In such a case, we just quit | |
763 | gdb killing the inferior program too. */ | |
764 | printf_unfiltered ("quit\n"); | |
f38d3ad1 | 765 | execute_command ("quit", stdin == ui->instream); |
b69d38af PA |
766 | } |
767 | else if (cmd == NULL) | |
768 | { | |
769 | /* We don't have a full line yet. Print an empty prompt. */ | |
770 | display_gdb_prompt (""); | |
771 | } | |
772 | else | |
773 | { | |
774 | command_handler (cmd); | |
775 | display_gdb_prompt (0); | |
b5a0ac70 | 776 | } |
b5a0ac70 SS |
777 | } |
778 | ||
779 | /* Does reading of input from terminal w/o the editing features | |
c70061cf PA |
780 | provided by the readline library. Calls the line input handler |
781 | once we have a whole input line. */ | |
b5a0ac70 | 782 | |
085dd6e6 | 783 | void |
c70061cf | 784 | gdb_readline_no_editing_callback (gdb_client_data client_data) |
b5a0ac70 SS |
785 | { |
786 | int c; | |
787 | char *result; | |
187212b3 | 788 | struct buffer line_buffer; |
7be570e7 | 789 | static int done_once = 0; |
a74e1786 | 790 | struct ui *ui = current_ui; |
7be570e7 | 791 | |
187212b3 PA |
792 | buffer_init (&line_buffer); |
793 | ||
7be570e7 | 794 | /* Unbuffer the input stream, so that, later on, the calls to fgetc |
371d5dec | 795 | fetch only one char at the time from the stream. The fgetc's will |
7be570e7 | 796 | get up to the first newline, but there may be more chars in the |
371d5dec | 797 | stream after '\n'. If we buffer the input and fgetc drains the |
7be570e7 | 798 | stream, getting stuff beyond the newline as well, a select, done |
371d5dec | 799 | afterwards will not trigger. */ |
f38d3ad1 | 800 | if (!done_once && !ISATTY (ui->instream)) |
7be570e7 | 801 | { |
f38d3ad1 | 802 | setbuf (ui->instream, NULL); |
7be570e7 JM |
803 | done_once = 1; |
804 | } | |
b5a0ac70 | 805 | |
b5a0ac70 | 806 | /* We still need the while loop here, even though it would seem |
c70061cf PA |
807 | obvious to invoke gdb_readline_no_editing_callback at every |
808 | character entered. If not using the readline library, the | |
809 | terminal is in cooked mode, which sends the characters all at | |
810 | once. Poll will notice that the input fd has changed state only | |
811 | after enter is pressed. At this point we still need to fetch all | |
812 | the chars entered. */ | |
b5a0ac70 SS |
813 | |
814 | while (1) | |
815 | { | |
816 | /* Read from stdin if we are executing a user defined command. | |
817 | This is the right thing for prompt_for_continue, at least. */ | |
f38d3ad1 | 818 | c = fgetc (ui->instream ? ui->instream : stdin); |
b5a0ac70 SS |
819 | |
820 | if (c == EOF) | |
821 | { | |
187212b3 PA |
822 | if (line_buffer.used_size > 0) |
823 | { | |
824 | /* The last line does not end with a newline. Return it, and | |
825 | if we are called again fgetc will still return EOF and | |
826 | we'll return NULL then. */ | |
827 | break; | |
828 | } | |
829 | xfree (buffer_finish (&line_buffer)); | |
a74e1786 | 830 | ui->input_handler (NULL); |
13ce7133 | 831 | return; |
b5a0ac70 SS |
832 | } |
833 | ||
834 | if (c == '\n') | |
b5a0ac70 | 835 | { |
187212b3 PA |
836 | if (line_buffer.used_size > 0 |
837 | && line_buffer.buffer[line_buffer.used_size - 1] == '\r') | |
838 | line_buffer.used_size--; | |
b5a0ac70 SS |
839 | break; |
840 | } | |
b5a0ac70 | 841 | |
187212b3 | 842 | buffer_grow_char (&line_buffer, c); |
b5a0ac70 SS |
843 | } |
844 | ||
187212b3 PA |
845 | buffer_grow_char (&line_buffer, '\0'); |
846 | result = buffer_finish (&line_buffer); | |
a74e1786 | 847 | ui->input_handler (result); |
b5a0ac70 SS |
848 | } |
849 | \f | |
850 | ||
f0881b37 PA |
851 | /* The serial event associated with the QUIT flag. set_quit_flag sets |
852 | this, and check_quit_flag clears it. Used by interruptible_select | |
853 | to be able to do interruptible I/O with no race with the SIGINT | |
854 | handler. */ | |
855 | static struct serial_event *quit_serial_event; | |
856 | ||
b5a0ac70 | 857 | /* Initialization of signal handlers and tokens. There is a function |
371d5dec | 858 | handle_sig* for each of the signals GDB cares about. Specifically: |
b5a0ac70 SS |
859 | SIGINT, SIGFPE, SIGQUIT, SIGTSTP, SIGHUP, SIGWINCH. These |
860 | functions are the actual signal handlers associated to the signals | |
861 | via calls to signal(). The only job for these functions is to | |
862 | enqueue the appropriate event/procedure with the event loop. Such | |
371d5dec | 863 | procedures are the old signal handlers. The event loop will take |
b5a0ac70 | 864 | care of invoking the queued procedures to perform the usual tasks |
371d5dec | 865 | associated with the reception of the signal. */ |
392a587b | 866 | /* NOTE: 1999-04-30 This is the asynchronous version of init_signals. |
b5a0ac70 | 867 | init_signals will become obsolete as we move to have to event loop |
371d5dec | 868 | as the default for gdb. */ |
b5a0ac70 | 869 | void |
c2c6d25f | 870 | async_init_signals (void) |
c5aa993b | 871 | { |
5cc3ce8b PA |
872 | initialize_async_signal_handlers (); |
873 | ||
f0881b37 PA |
874 | quit_serial_event = make_serial_event (); |
875 | ||
b5a0ac70 SS |
876 | signal (SIGINT, handle_sigint); |
877 | sigint_token = | |
0f71a2f6 | 878 | create_async_signal_handler (async_request_quit, NULL); |
a7266fef | 879 | signal (SIGTERM, handle_sigterm); |
06c868a8 JK |
880 | async_sigterm_token |
881 | = create_async_signal_handler (async_sigterm_handler, NULL); | |
b5a0ac70 SS |
882 | |
883 | /* If SIGTRAP was set to SIG_IGN, then the SIG_IGN will get passed | |
884 | to the inferior and breakpoints will be ignored. */ | |
885 | #ifdef SIGTRAP | |
886 | signal (SIGTRAP, SIG_DFL); | |
887 | #endif | |
888 | ||
6d318c73 | 889 | #ifdef SIGQUIT |
b5a0ac70 SS |
890 | /* If we initialize SIGQUIT to SIG_IGN, then the SIG_IGN will get |
891 | passed to the inferior, which we don't want. It would be | |
892 | possible to do a "signal (SIGQUIT, SIG_DFL)" after we fork, but | |
893 | on BSD4.3 systems using vfork, that can affect the | |
894 | GDB process as well as the inferior (the signal handling tables | |
895 | might be in memory, shared between the two). Since we establish | |
896 | a handler for SIGQUIT, when we call exec it will set the signal | |
897 | to SIG_DFL for us. */ | |
898 | signal (SIGQUIT, handle_sigquit); | |
899 | sigquit_token = | |
0f71a2f6 | 900 | create_async_signal_handler (async_do_nothing, NULL); |
6d318c73 | 901 | #endif |
b5a0ac70 SS |
902 | #ifdef SIGHUP |
903 | if (signal (SIGHUP, handle_sighup) != SIG_IGN) | |
904 | sighup_token = | |
0f71a2f6 | 905 | create_async_signal_handler (async_disconnect, NULL); |
b5a0ac70 SS |
906 | else |
907 | sighup_token = | |
0f71a2f6 | 908 | create_async_signal_handler (async_do_nothing, NULL); |
b5a0ac70 SS |
909 | #endif |
910 | signal (SIGFPE, handle_sigfpe); | |
911 | sigfpe_token = | |
0f71a2f6 | 912 | create_async_signal_handler (async_float_handler, NULL); |
b5a0ac70 | 913 | |
0f71a2f6 JM |
914 | #ifdef STOP_SIGNAL |
915 | sigtstp_token = | |
916 | create_async_signal_handler (async_stop_sig, NULL); | |
917 | #endif | |
0f71a2f6 JM |
918 | } |
919 | ||
f0881b37 PA |
920 | /* See defs.h. */ |
921 | ||
922 | void | |
923 | quit_serial_event_set (void) | |
924 | { | |
925 | serial_event_set (quit_serial_event); | |
926 | } | |
927 | ||
928 | /* See defs.h. */ | |
929 | ||
930 | void | |
931 | quit_serial_event_clear (void) | |
932 | { | |
933 | serial_event_clear (quit_serial_event); | |
934 | } | |
935 | ||
936 | /* Return the selectable file descriptor of the serial event | |
937 | associated with the quit flag. */ | |
938 | ||
939 | static int | |
940 | quit_serial_event_fd (void) | |
941 | { | |
942 | return serial_event_fd (quit_serial_event); | |
943 | } | |
944 | ||
048094ac PA |
945 | /* See defs.h. */ |
946 | ||
947 | void | |
948 | default_quit_handler (void) | |
949 | { | |
950 | if (check_quit_flag ()) | |
951 | { | |
952 | if (target_terminal_is_ours ()) | |
953 | quit (); | |
954 | else | |
955 | target_pass_ctrlc (); | |
956 | } | |
957 | } | |
958 | ||
959 | /* See defs.h. */ | |
960 | quit_handler_ftype *quit_handler = default_quit_handler; | |
961 | ||
962 | /* Data for make_cleanup_override_quit_handler. Wrap the previous | |
963 | handler pointer in a data struct because it's not portable to cast | |
964 | a function pointer to a data pointer, which is what make_cleanup | |
965 | expects. */ | |
966 | struct quit_handler_cleanup_data | |
967 | { | |
968 | /* The previous quit handler. */ | |
969 | quit_handler_ftype *prev_handler; | |
970 | }; | |
971 | ||
972 | /* Cleanup call that restores the previous quit handler. */ | |
973 | ||
974 | static void | |
975 | restore_quit_handler (void *arg) | |
976 | { | |
977 | struct quit_handler_cleanup_data *data | |
978 | = (struct quit_handler_cleanup_data *) arg; | |
979 | ||
980 | quit_handler = data->prev_handler; | |
981 | } | |
982 | ||
983 | /* Destructor for the quit handler cleanup. */ | |
984 | ||
985 | static void | |
986 | restore_quit_handler_dtor (void *arg) | |
987 | { | |
988 | xfree (arg); | |
989 | } | |
990 | ||
991 | /* See defs.h. */ | |
992 | ||
993 | struct cleanup * | |
994 | make_cleanup_override_quit_handler (quit_handler_ftype *new_quit_handler) | |
995 | { | |
996 | struct cleanup *old_chain; | |
997 | struct quit_handler_cleanup_data *data; | |
998 | ||
999 | data = XNEW (struct quit_handler_cleanup_data); | |
1000 | data->prev_handler = quit_handler; | |
1001 | old_chain = make_cleanup_dtor (restore_quit_handler, data, | |
1002 | restore_quit_handler_dtor); | |
1003 | quit_handler = new_quit_handler; | |
1004 | return old_chain; | |
1005 | } | |
1006 | ||
f0881b37 PA |
1007 | /* Handle a SIGINT. */ |
1008 | ||
c5aa993b | 1009 | void |
c2c6d25f | 1010 | handle_sigint (int sig) |
b5a0ac70 SS |
1011 | { |
1012 | signal (sig, handle_sigint); | |
1013 | ||
5f960e00 FF |
1014 | /* We could be running in a loop reading in symfiles or something so |
1015 | it may be quite a while before we get back to the event loop. So | |
371d5dec | 1016 | set quit_flag to 1 here. Then if QUIT is called before we get to |
5f960e00 | 1017 | the event loop, we will unwind as expected. */ |
522002f9 | 1018 | set_quit_flag (); |
5f960e00 | 1019 | |
585a46a2 PA |
1020 | /* In case nothing calls QUIT before the event loop is reached, the |
1021 | event loop handles it. */ | |
1022 | mark_async_signal_handler (sigint_token); | |
b5a0ac70 SS |
1023 | } |
1024 | ||
f0881b37 PA |
1025 | /* See gdb_select.h. */ |
1026 | ||
1027 | int | |
1028 | interruptible_select (int n, | |
1029 | fd_set *readfds, fd_set *writefds, fd_set *exceptfds, | |
1030 | struct timeval *timeout) | |
1031 | { | |
1032 | fd_set my_readfds; | |
1033 | int fd; | |
1034 | int res; | |
1035 | ||
1036 | if (readfds == NULL) | |
1037 | { | |
1038 | readfds = &my_readfds; | |
1039 | FD_ZERO (&my_readfds); | |
1040 | } | |
1041 | ||
1042 | fd = quit_serial_event_fd (); | |
1043 | FD_SET (fd, readfds); | |
1044 | if (n <= fd) | |
1045 | n = fd + 1; | |
1046 | ||
1047 | do | |
1048 | { | |
1049 | res = gdb_select (n, readfds, writefds, exceptfds, timeout); | |
1050 | } | |
1051 | while (res == -1 && errno == EINTR); | |
1052 | ||
1053 | if (res == 1 && FD_ISSET (fd, readfds)) | |
1054 | { | |
1055 | errno = EINTR; | |
1056 | return -1; | |
1057 | } | |
1058 | return res; | |
1059 | } | |
1060 | ||
06c868a8 JK |
1061 | /* Handle GDB exit upon receiving SIGTERM if target_can_async_p (). */ |
1062 | ||
1063 | static void | |
1064 | async_sigterm_handler (gdb_client_data arg) | |
1065 | { | |
f38d3ad1 | 1066 | quit_force (NULL, stdin == current_ui->instream); |
06c868a8 JK |
1067 | } |
1068 | ||
1069 | /* See defs.h. */ | |
1070 | volatile int sync_quit_force_run; | |
1071 | ||
a7266fef AS |
1072 | /* Quit GDB if SIGTERM is received. |
1073 | GDB would quit anyway, but this way it will clean up properly. */ | |
1074 | void | |
1075 | handle_sigterm (int sig) | |
1076 | { | |
1077 | signal (sig, handle_sigterm); | |
06c868a8 | 1078 | |
077836f7 PP |
1079 | sync_quit_force_run = 1; |
1080 | set_quit_flag (); | |
1081 | ||
1082 | mark_async_signal_handler (async_sigterm_token); | |
a7266fef AS |
1083 | } |
1084 | ||
371d5dec | 1085 | /* Do the quit. All the checks have been done by the caller. */ |
c5aa993b | 1086 | void |
c2c6d25f | 1087 | async_request_quit (gdb_client_data arg) |
b5a0ac70 | 1088 | { |
5f960e00 | 1089 | /* If the quit_flag has gotten reset back to 0 by the time we get |
4ac94eda FF |
1090 | back here, that means that an exception was thrown to unwind the |
1091 | current command before we got back to the event loop. So there | |
522002f9 | 1092 | is no reason to call quit again here. */ |
048094ac | 1093 | QUIT; |
b5a0ac70 SS |
1094 | } |
1095 | ||
6d318c73 | 1096 | #ifdef SIGQUIT |
371d5dec MS |
1097 | /* Tell the event loop what to do if SIGQUIT is received. |
1098 | See event-signal.c. */ | |
c5aa993b | 1099 | static void |
c2c6d25f | 1100 | handle_sigquit (int sig) |
b5a0ac70 | 1101 | { |
f6fbab7d | 1102 | mark_async_signal_handler (sigquit_token); |
b5a0ac70 SS |
1103 | signal (sig, handle_sigquit); |
1104 | } | |
6d318c73 | 1105 | #endif |
b5a0ac70 | 1106 | |
0f0b8dcd DJ |
1107 | #if defined (SIGQUIT) || defined (SIGHUP) |
1108 | /* Called by the event loop in response to a SIGQUIT or an | |
1109 | ignored SIGHUP. */ | |
c5aa993b | 1110 | static void |
c2c6d25f | 1111 | async_do_nothing (gdb_client_data arg) |
b5a0ac70 | 1112 | { |
371d5dec | 1113 | /* Empty function body. */ |
b5a0ac70 | 1114 | } |
0f0b8dcd | 1115 | #endif |
b5a0ac70 SS |
1116 | |
1117 | #ifdef SIGHUP | |
371d5dec MS |
1118 | /* Tell the event loop what to do if SIGHUP is received. |
1119 | See event-signal.c. */ | |
c5aa993b | 1120 | static void |
fba45db2 | 1121 | handle_sighup (int sig) |
b5a0ac70 | 1122 | { |
f6fbab7d | 1123 | mark_async_signal_handler (sighup_token); |
b5a0ac70 SS |
1124 | signal (sig, handle_sighup); |
1125 | } | |
1126 | ||
371d5dec | 1127 | /* Called by the event loop to process a SIGHUP. */ |
c5aa993b | 1128 | static void |
c2c6d25f | 1129 | async_disconnect (gdb_client_data arg) |
b5a0ac70 | 1130 | { |
b2cd6b29 | 1131 | |
492d29ea | 1132 | TRY |
b2cd6b29 JM |
1133 | { |
1134 | quit_cover (); | |
1135 | } | |
1136 | ||
492d29ea | 1137 | CATCH (exception, RETURN_MASK_ALL) |
b2cd6b29 JM |
1138 | { |
1139 | fputs_filtered ("Could not kill the program being debugged", | |
1140 | gdb_stderr); | |
1141 | exception_print (gdb_stderr, exception); | |
1142 | } | |
492d29ea | 1143 | END_CATCH |
b2cd6b29 | 1144 | |
492d29ea | 1145 | TRY |
b2cd6b29 | 1146 | { |
460014f5 | 1147 | pop_all_targets (); |
b2cd6b29 | 1148 | } |
492d29ea PA |
1149 | CATCH (exception, RETURN_MASK_ALL) |
1150 | { | |
1151 | } | |
1152 | END_CATCH | |
b2cd6b29 | 1153 | |
371d5dec | 1154 | signal (SIGHUP, SIG_DFL); /*FIXME: ??????????? */ |
ec4dfccf | 1155 | raise (SIGHUP); |
b5a0ac70 SS |
1156 | } |
1157 | #endif | |
1158 | ||
0f71a2f6 | 1159 | #ifdef STOP_SIGNAL |
c5aa993b | 1160 | void |
c2c6d25f | 1161 | handle_stop_sig (int sig) |
0f71a2f6 | 1162 | { |
f6fbab7d | 1163 | mark_async_signal_handler (sigtstp_token); |
c5aa993b | 1164 | signal (sig, handle_stop_sig); |
0f71a2f6 JM |
1165 | } |
1166 | ||
1167 | static void | |
c2c6d25f | 1168 | async_stop_sig (gdb_client_data arg) |
0f71a2f6 | 1169 | { |
ab821bc6 | 1170 | char *prompt = get_prompt (); |
d7f9d729 | 1171 | |
0f71a2f6 JM |
1172 | #if STOP_SIGNAL == SIGTSTP |
1173 | signal (SIGTSTP, SIG_DFL); | |
2acceee2 JM |
1174 | #if HAVE_SIGPROCMASK |
1175 | { | |
1176 | sigset_t zero; | |
46711df8 | 1177 | |
2acceee2 JM |
1178 | sigemptyset (&zero); |
1179 | sigprocmask (SIG_SETMASK, &zero, 0); | |
1180 | } | |
46711df8 | 1181 | #elif HAVE_SIGSETMASK |
0f71a2f6 | 1182 | sigsetmask (0); |
2acceee2 | 1183 | #endif |
ec4dfccf | 1184 | raise (SIGTSTP); |
0f71a2f6 JM |
1185 | signal (SIGTSTP, handle_stop_sig); |
1186 | #else | |
1187 | signal (STOP_SIGNAL, handle_stop_sig); | |
1188 | #endif | |
1189 | printf_unfiltered ("%s", prompt); | |
1190 | gdb_flush (gdb_stdout); | |
1191 | ||
371d5dec MS |
1192 | /* Forget about any previous command -- null line now will do |
1193 | nothing. */ | |
0f71a2f6 JM |
1194 | dont_repeat (); |
1195 | } | |
1196 | #endif /* STOP_SIGNAL */ | |
1197 | ||
371d5dec MS |
1198 | /* Tell the event loop what to do if SIGFPE is received. |
1199 | See event-signal.c. */ | |
c5aa993b | 1200 | static void |
c2c6d25f | 1201 | handle_sigfpe (int sig) |
b5a0ac70 | 1202 | { |
f6fbab7d | 1203 | mark_async_signal_handler (sigfpe_token); |
b5a0ac70 SS |
1204 | signal (sig, handle_sigfpe); |
1205 | } | |
1206 | ||
371d5dec | 1207 | /* Event loop will call this functin to process a SIGFPE. */ |
c5aa993b | 1208 | static void |
c2c6d25f | 1209 | async_float_handler (gdb_client_data arg) |
b5a0ac70 | 1210 | { |
371d5dec MS |
1211 | /* This message is based on ANSI C, section 4.7. Note that integer |
1212 | divide by zero causes this, so "float" is a misnomer. */ | |
8a3fe4f8 | 1213 | error (_("Erroneous arithmetic operation.")); |
b5a0ac70 | 1214 | } |
b5a0ac70 SS |
1215 | \f |
1216 | ||
1217 | /* Called by do_setshow_command. */ | |
b5a0ac70 | 1218 | void |
371d5dec MS |
1219 | set_async_editing_command (char *args, int from_tty, |
1220 | struct cmd_list_element *c) | |
b5a0ac70 SS |
1221 | { |
1222 | change_line_handler (); | |
1223 | } | |
1224 | ||
0f71a2f6 | 1225 | /* Set things up for readline to be invoked via the alternate |
3c610247 PA |
1226 | interface, i.e. via a callback function |
1227 | (gdb_rl_callback_read_char), and hook up instream to the event | |
1228 | loop. */ | |
1229 | ||
0f71a2f6 | 1230 | void |
cee6ddeb | 1231 | gdb_setup_readline (void) |
0f71a2f6 | 1232 | { |
a74e1786 PA |
1233 | struct ui *ui = current_ui; |
1234 | ||
362646f5 AC |
1235 | /* This function is a noop for the sync case. The assumption is |
1236 | that the sync setup is ALL done in gdb_init, and we would only | |
1237 | mess it up here. The sync stuff should really go away over | |
1238 | time. */ | |
1a088d06 AS |
1239 | if (!batch_silent) |
1240 | gdb_stdout = stdio_fileopen (stdout); | |
ffa4ac95 | 1241 | gdb_stderr = stderr_fileopen (); |
362646f5 AC |
1242 | gdb_stdlog = gdb_stderr; /* for moment */ |
1243 | gdb_stdtarg = gdb_stderr; /* for moment */ | |
8d4d924b | 1244 | gdb_stdtargerr = gdb_stderr; /* for moment */ |
362646f5 AC |
1245 | |
1246 | /* If the input stream is connected to a terminal, turn on | |
1247 | editing. */ | |
f38d3ad1 | 1248 | if (ISATTY (ui->instream)) |
9e0b60a8 | 1249 | { |
371d5dec | 1250 | /* Tell gdb that we will be using the readline library. This |
362646f5 AC |
1251 | could be overwritten by a command in .gdbinit like 'set |
1252 | editing on' or 'off'. */ | |
1253 | async_command_editing_p = 1; | |
c5201926 | 1254 | |
362646f5 AC |
1255 | /* When a character is detected on instream by select or poll, |
1256 | readline will be invoked via this callback function. */ | |
a74e1786 | 1257 | ui->call_readline = gdb_rl_callback_read_char_wrapper; |
9e0b60a8 | 1258 | } |
362646f5 AC |
1259 | else |
1260 | { | |
1261 | async_command_editing_p = 0; | |
a74e1786 | 1262 | ui->call_readline = gdb_readline_no_editing_callback; |
362646f5 AC |
1263 | } |
1264 | ||
1265 | /* When readline has read an end-of-line character, it passes the | |
371d5dec | 1266 | complete line to gdb for processing; command_line_handler is the |
362646f5 | 1267 | function that does this. */ |
a74e1786 PA |
1268 | ui->input_handler = command_line_handler; |
1269 | ||
371d5dec | 1270 | /* Tell readline to use the same input stream that gdb uses. */ |
f38d3ad1 | 1271 | rl_instream = ui->instream; |
362646f5 | 1272 | |
41fd2b0f PA |
1273 | /* Now create the event source for this UI's input file descriptor. |
1274 | Another source is going to be the target program (inferior), but | |
1275 | that must be registered only when it actually exists (I.e. after | |
1276 | we say 'run' or after we connect to a remote target. */ | |
1277 | add_file_handler (ui->input_fd, stdin_event_handler, ui); | |
0f71a2f6 | 1278 | } |
cee6ddeb | 1279 | |
7d5b6fdd EZ |
1280 | /* Disable command input through the standard CLI channels. Used in |
1281 | the suspend proc for interpreters that use the standard gdb readline | |
1282 | interface, like the cli & the mi. */ | |
1283 | void | |
1284 | gdb_disable_readline (void) | |
1285 | { | |
41fd2b0f PA |
1286 | struct ui *ui = current_ui; |
1287 | ||
362646f5 AC |
1288 | /* FIXME - It is too heavyweight to delete and remake these every |
1289 | time you run an interpreter that needs readline. It is probably | |
1290 | better to have the interpreters cache these, which in turn means | |
1291 | that this needs to be moved into interpreter specific code. */ | |
7d5b6fdd EZ |
1292 | |
1293 | #if 0 | |
362646f5 AC |
1294 | ui_file_delete (gdb_stdout); |
1295 | ui_file_delete (gdb_stderr); | |
1296 | gdb_stdlog = NULL; | |
1297 | gdb_stdtarg = NULL; | |
8d4d924b | 1298 | gdb_stdtargerr = NULL; |
7d5b6fdd EZ |
1299 | #endif |
1300 | ||
d3d4baed | 1301 | gdb_rl_callback_handler_remove (); |
41fd2b0f | 1302 | delete_file_handler (ui->input_fd); |
7d5b6fdd | 1303 | } |