Commit | Line | Data |
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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 | ||
b5a0ac70 | 97 | /* This is the file descriptor for the input stream that GDB uses to |
371d5dec | 98 | read commands from. */ |
b5a0ac70 SS |
99 | int input_fd; |
100 | ||
d64e57fa PP |
101 | /* Used by the stdin event handler to compensate for missed stdin events. |
102 | Setting this to a non-zero value inside an stdin callback makes the callback | |
103 | run again. */ | |
104 | int call_stdin_event_handler_again_p; | |
105 | ||
371d5dec | 106 | /* Signal handling variables. */ |
b5a0ac70 | 107 | /* Each of these is a pointer to a function that the event loop will |
371d5dec | 108 | invoke if the corresponding signal has received. The real signal |
b5a0ac70 | 109 | handlers mark these functions as ready to be executed and the event |
371d5dec MS |
110 | loop, in a later iteration, calls them. See the function |
111 | invoke_async_signal_handler. */ | |
05fa9251 | 112 | static struct async_signal_handler *sigint_token; |
b5a0ac70 | 113 | #ifdef SIGHUP |
05fa9251 | 114 | static struct async_signal_handler *sighup_token; |
b5a0ac70 | 115 | #endif |
6d318c73 | 116 | #ifdef SIGQUIT |
05fa9251 | 117 | static struct async_signal_handler *sigquit_token; |
6d318c73 | 118 | #endif |
05fa9251 | 119 | static struct async_signal_handler *sigfpe_token; |
0f71a2f6 | 120 | #ifdef STOP_SIGNAL |
05fa9251 | 121 | static struct async_signal_handler *sigtstp_token; |
0f71a2f6 | 122 | #endif |
06c868a8 | 123 | static struct async_signal_handler *async_sigterm_token; |
0f71a2f6 | 124 | |
3c610247 | 125 | /* This hook is called by gdb_rl_callback_read_char_wrapper after each |
467d8519 | 126 | character is processed. */ |
b08ee6a2 | 127 | void (*after_char_processing_hook) (void); |
b5a0ac70 SS |
128 | \f |
129 | ||
89525768 PA |
130 | /* Wrapper function for calling into the readline library. This takes |
131 | care of a couple things: | |
132 | ||
133 | - The event loop expects the callback function to have a parameter, | |
134 | while readline expects none. | |
135 | ||
136 | - Propagation of GDB exceptions/errors thrown from INPUT_HANDLER | |
137 | across readline requires special handling. | |
138 | ||
139 | On the exceptions issue: | |
140 | ||
141 | DWARF-based unwinding cannot cross code built without -fexceptions. | |
142 | Any exception that tries to propagate through such code will fail | |
143 | and the result is a call to std::terminate. While some ABIs, such | |
144 | as x86-64, require all code to be built with exception tables, | |
145 | others don't. | |
146 | ||
147 | This is a problem when GDB calls some non-EH-aware C library code, | |
148 | that calls into GDB again through a callback, and that GDB callback | |
149 | code throws a C++ exception. Turns out this is exactly what | |
150 | happens with GDB's readline callback. | |
151 | ||
152 | In such cases, we must catch and save any C++ exception that might | |
153 | be thrown from the GDB callback before returning to the | |
154 | non-EH-aware code. When the non-EH-aware function itself returns | |
155 | back to GDB, we then rethrow the original C++ exception. | |
156 | ||
157 | In the readline case however, the right thing to do is to longjmp | |
158 | out of the callback, rather than do a normal return -- there's no | |
159 | way for the callback to return to readline an indication that an | |
160 | error happened, so a normal return would have rl_callback_read_char | |
161 | potentially continue processing further input, redisplay the | |
162 | prompt, etc. Instead of raw setjmp/longjmp however, we use our | |
163 | sjlj-based TRY/CATCH mechanism, which knows to handle multiple | |
164 | levels of active setjmp/longjmp frames, needed in order to handle | |
165 | the readline callback recursing, as happens with e.g., secondary | |
166 | prompts / queries, through gdb_readline_wrapper. */ | |
167 | ||
c2c6d25f | 168 | static void |
3c610247 | 169 | gdb_rl_callback_read_char_wrapper (gdb_client_data client_data) |
c2c6d25f | 170 | { |
89525768 PA |
171 | struct gdb_exception gdb_expt = exception_none; |
172 | ||
173 | /* C++ exceptions can't normally be thrown across readline (unless | |
174 | it is built with -fexceptions, but it won't by default on many | |
175 | ABIs). So we instead wrap the readline call with a sjlj-based | |
176 | TRY/CATCH, and rethrow the GDB exception once back in GDB. */ | |
177 | TRY_SJLJ | |
178 | { | |
179 | rl_callback_read_char (); | |
180 | if (after_char_processing_hook) | |
181 | (*after_char_processing_hook) (); | |
182 | } | |
183 | CATCH_SJLJ (ex, RETURN_MASK_ALL) | |
184 | { | |
185 | gdb_expt = ex; | |
186 | } | |
187 | END_CATCH_SJLJ | |
188 | ||
189 | /* Rethrow using the normal EH mechanism. */ | |
190 | if (gdb_expt.reason < 0) | |
191 | throw_exception (gdb_expt); | |
192 | } | |
193 | ||
194 | /* GDB's readline callback handler. Calls the current INPUT_HANDLER, | |
195 | and propagates GDB exceptions/errors thrown from INPUT_HANDLER back | |
196 | across readline. See gdb_rl_callback_read_char_wrapper. */ | |
197 | ||
198 | static void | |
199 | gdb_rl_callback_handler (char *rl) | |
200 | { | |
201 | struct gdb_exception gdb_rl_expt = exception_none; | |
a74e1786 | 202 | struct ui *ui = current_ui; |
89525768 PA |
203 | |
204 | TRY | |
205 | { | |
a74e1786 | 206 | ui->input_handler (rl); |
89525768 PA |
207 | } |
208 | CATCH (ex, RETURN_MASK_ALL) | |
209 | { | |
210 | gdb_rl_expt = ex; | |
211 | } | |
212 | END_CATCH | |
213 | ||
214 | /* If we caught a GDB exception, longjmp out of the readline | |
215 | callback. There's no other way for the callback to signal to | |
216 | readline that an error happened. A normal return would have | |
217 | readline potentially continue processing further input, redisplay | |
218 | the prompt, etc. (This is what GDB historically did when it was | |
219 | a C program.) Note that since we're long jumping, local variable | |
220 | dtors are NOT run automatically. */ | |
221 | if (gdb_rl_expt.reason < 0) | |
222 | throw_exception_sjlj (gdb_rl_expt); | |
c2c6d25f JM |
223 | } |
224 | ||
b5a0ac70 | 225 | /* Initialize all the necessary variables, start the event loop, |
4d09c5b4 AB |
226 | register readline, and stdin, start the loop. The DATA is the |
227 | interpreter data cookie, ignored for now. */ | |
228 | ||
b5a0ac70 | 229 | void |
4d09c5b4 | 230 | cli_command_loop (void *data) |
b5a0ac70 | 231 | { |
7d8e6458 | 232 | display_gdb_prompt (0); |
b5a0ac70 | 233 | |
371d5dec | 234 | /* Now it's time to start the event loop. */ |
085dd6e6 | 235 | start_event_loop (); |
b5a0ac70 SS |
236 | } |
237 | ||
238 | /* Change the function to be invoked every time there is a character | |
371d5dec | 239 | ready on stdin. This is used when the user sets the editing off, |
b5a0ac70 | 240 | therefore bypassing readline, and letting gdb handle the input |
c70061cf PA |
241 | itself, via gdb_readline_no_editing_callback. Also it is used in |
242 | the opposite case in which the user sets editing on again, by | |
243 | restoring readline handling of the input. */ | |
392a587b | 244 | static void |
c2c6d25f | 245 | change_line_handler (void) |
b5a0ac70 | 246 | { |
a74e1786 PA |
247 | struct ui *ui = current_ui; |
248 | ||
371d5dec MS |
249 | /* NOTE: this operates on input_fd, not instream. If we are reading |
250 | commands from a file, instream will point to the file. However in | |
c2c6d25f | 251 | async mode, we always read commands from a file with editing |
371d5dec MS |
252 | off. This means that the 'set editing on/off' will have effect |
253 | only on the interactive session. */ | |
c2c6d25f | 254 | |
b5a0ac70 SS |
255 | if (async_command_editing_p) |
256 | { | |
371d5dec | 257 | /* Turn on editing by using readline. */ |
a74e1786 PA |
258 | ui->call_readline = gdb_rl_callback_read_char_wrapper; |
259 | ui->input_handler = command_line_handler; | |
b5a0ac70 SS |
260 | } |
261 | else | |
262 | { | |
c70061cf | 263 | /* Turn off editing by using gdb_readline_no_editing_callback. */ |
d3d4baed | 264 | gdb_rl_callback_handler_remove (); |
a74e1786 | 265 | ui->call_readline = gdb_readline_no_editing_callback; |
0f71a2f6 JM |
266 | |
267 | /* Set up the command handler as well, in case we are called as | |
371d5dec | 268 | first thing from .gdbinit. */ |
a74e1786 | 269 | ui->input_handler = command_line_handler; |
b5a0ac70 | 270 | } |
b5a0ac70 SS |
271 | } |
272 | ||
d3d4baed PA |
273 | /* The functions below are wrappers for rl_callback_handler_remove and |
274 | rl_callback_handler_install that keep track of whether the callback | |
275 | handler is installed in readline. This is necessary because after | |
276 | handling a target event of a background execution command, we may | |
277 | need to reinstall the callback handler if it was removed due to a | |
278 | secondary prompt. See gdb_readline_wrapper_line. We don't | |
279 | unconditionally install the handler for every target event because | |
280 | that also clears the line buffer, thus installing it while the user | |
281 | is typing would lose input. */ | |
282 | ||
283 | /* Whether we've registered a callback handler with readline. */ | |
284 | static int callback_handler_installed; | |
285 | ||
286 | /* See event-top.h, and above. */ | |
287 | ||
288 | void | |
289 | gdb_rl_callback_handler_remove (void) | |
290 | { | |
291 | rl_callback_handler_remove (); | |
292 | callback_handler_installed = 0; | |
293 | } | |
294 | ||
295 | /* See event-top.h, and above. Note this wrapper doesn't have an | |
296 | actual callback parameter because we always install | |
297 | INPUT_HANDLER. */ | |
298 | ||
299 | void | |
300 | gdb_rl_callback_handler_install (const char *prompt) | |
301 | { | |
302 | /* Calling rl_callback_handler_install resets readline's input | |
303 | buffer. Calling this when we were already processing input | |
304 | therefore loses input. */ | |
305 | gdb_assert (!callback_handler_installed); | |
306 | ||
89525768 | 307 | rl_callback_handler_install (prompt, gdb_rl_callback_handler); |
d3d4baed PA |
308 | callback_handler_installed = 1; |
309 | } | |
310 | ||
311 | /* See event-top.h, and above. */ | |
312 | ||
313 | void | |
314 | gdb_rl_callback_handler_reinstall (void) | |
315 | { | |
316 | if (!callback_handler_installed) | |
317 | { | |
318 | /* Passing NULL as prompt argument tells readline to not display | |
319 | a prompt. */ | |
320 | gdb_rl_callback_handler_install (NULL); | |
321 | } | |
322 | } | |
323 | ||
ab821bc6 PA |
324 | /* Displays the prompt. If the argument NEW_PROMPT is NULL, the |
325 | prompt that is displayed is the current top level prompt. | |
326 | Otherwise, it displays whatever NEW_PROMPT is as a local/secondary | |
327 | prompt. | |
328 | ||
329 | This is used after each gdb command has completed, and in the | |
330 | following cases: | |
331 | ||
371d5dec | 332 | 1. When the user enters a command line which is ended by '\' |
ab821bc6 PA |
333 | indicating that the command will continue on the next line. In |
334 | that case the prompt that is displayed is the empty string. | |
335 | ||
0f71a2f6 | 336 | 2. When the user is entering 'commands' for a breakpoint, or |
371d5dec | 337 | actions for a tracepoint. In this case the prompt will be '>' |
ab821bc6 PA |
338 | |
339 | 3. On prompting for pagination. */ | |
340 | ||
b5a0ac70 | 341 | void |
38bcc89d | 342 | display_gdb_prompt (const char *new_prompt) |
b5a0ac70 | 343 | { |
d17b6f81 | 344 | char *actual_gdb_prompt = NULL; |
ab821bc6 | 345 | struct cleanup *old_chain; |
b5a0ac70 | 346 | |
bd00c694 PA |
347 | annotate_display_prompt (); |
348 | ||
16026cd7 AS |
349 | /* Reset the nesting depth used when trace-commands is set. */ |
350 | reset_command_nest_depth (); | |
351 | ||
ab821bc6 | 352 | old_chain = make_cleanup (free_current_contents, &actual_gdb_prompt); |
d17b6f81 | 353 | |
ab821bc6 PA |
354 | /* Do not call the python hook on an explicit prompt change as |
355 | passed to this function, as this forms a secondary/local prompt, | |
356 | IE, displayed but not set. */ | |
357 | if (! new_prompt) | |
adf40b2e | 358 | { |
ab821bc6 | 359 | if (sync_execution) |
d17b6f81 | 360 | { |
ab821bc6 PA |
361 | /* This is to trick readline into not trying to display the |
362 | prompt. Even though we display the prompt using this | |
363 | function, readline still tries to do its own display if | |
364 | we don't call rl_callback_handler_install and | |
365 | rl_callback_handler_remove (which readline detects | |
366 | because a global variable is not set). If readline did | |
367 | that, it could mess up gdb signal handlers for SIGINT. | |
368 | Readline assumes that between calls to rl_set_signals and | |
369 | rl_clear_signals gdb doesn't do anything with the signal | |
370 | handlers. Well, that's not the case, because when the | |
371 | target executes we change the SIGINT signal handler. If | |
372 | we allowed readline to display the prompt, the signal | |
373 | handler change would happen exactly between the calls to | |
374 | the above two functions. Calling | |
375 | rl_callback_handler_remove(), does the job. */ | |
376 | ||
d3d4baed | 377 | gdb_rl_callback_handler_remove (); |
faab9922 | 378 | do_cleanups (old_chain); |
ab821bc6 | 379 | return; |
d17b6f81 PM |
380 | } |
381 | else | |
ab821bc6 PA |
382 | { |
383 | /* Display the top level prompt. */ | |
384 | actual_gdb_prompt = top_level_prompt (); | |
385 | } | |
b5a0ac70 | 386 | } |
ab821bc6 PA |
387 | else |
388 | actual_gdb_prompt = xstrdup (new_prompt); | |
b5a0ac70 SS |
389 | |
390 | if (async_command_editing_p) | |
391 | { | |
d3d4baed PA |
392 | gdb_rl_callback_handler_remove (); |
393 | gdb_rl_callback_handler_install (actual_gdb_prompt); | |
b5a0ac70 | 394 | } |
371d5dec | 395 | /* new_prompt at this point can be the top of the stack or the one |
d014929c MS |
396 | passed in. It can't be NULL. */ |
397 | else | |
b5a0ac70 SS |
398 | { |
399 | /* Don't use a _filtered function here. It causes the assumed | |
400 | character position to be off, since the newline we read from | |
401 | the user is not accounted for. */ | |
d17b6f81 | 402 | fputs_unfiltered (actual_gdb_prompt, gdb_stdout); |
b5a0ac70 SS |
403 | gdb_flush (gdb_stdout); |
404 | } | |
ab821bc6 PA |
405 | |
406 | do_cleanups (old_chain); | |
b5a0ac70 SS |
407 | } |
408 | ||
ab821bc6 PA |
409 | /* Return the top level prompt, as specified by "set prompt", possibly |
410 | overriden by the python gdb.prompt_hook hook, and then composed | |
411 | with the prompt prefix and suffix (annotations). The caller is | |
412 | responsible for freeing the returned string. */ | |
413 | ||
414 | static char * | |
415 | top_level_prompt (void) | |
b5a0ac70 | 416 | { |
608ff013 | 417 | char *prompt; |
b5a0ac70 | 418 | |
ab821bc6 PA |
419 | /* Give observers a chance of changing the prompt. E.g., the python |
420 | `gdb.prompt_hook' is installed as an observer. */ | |
421 | observer_notify_before_prompt (get_prompt ()); | |
422 | ||
608ff013 | 423 | prompt = get_prompt (); |
b5a0ac70 | 424 | |
ab821bc6 | 425 | if (annotation_level >= 2) |
b5a0ac70 | 426 | { |
ab821bc6 | 427 | /* Prefix needs to have new line at end. */ |
608ff013 | 428 | const char prefix[] = "\n\032\032pre-prompt\n"; |
ab821bc6 PA |
429 | |
430 | /* Suffix needs to have a new line at end and \032 \032 at | |
431 | beginning. */ | |
608ff013 | 432 | const char suffix[] = "\n\032\032prompt\n"; |
b5a0ac70 | 433 | |
b36cec19 | 434 | return concat (prefix, prompt, suffix, (char *) NULL); |
608ff013 | 435 | } |
ab821bc6 | 436 | |
608ff013 | 437 | return xstrdup (prompt); |
b5a0ac70 | 438 | } |
c2c6d25f | 439 | |
73ab01a0 PA |
440 | /* The main UI. This is the UI that is bound to stdin/stdout/stderr. |
441 | It always exists and is created automatically when GDB starts | |
442 | up. */ | |
443 | static struct ui main_ui_; | |
444 | ||
445 | struct ui *current_ui = &main_ui_; | |
446 | struct ui *ui_list = &main_ui_; | |
447 | ||
448 | /* Cleanup that restores the current UI. */ | |
449 | ||
450 | static void | |
451 | restore_ui_cleanup (void *data) | |
452 | { | |
453 | current_ui = (struct ui *) data; | |
454 | } | |
455 | ||
456 | /* See top.h. */ | |
457 | ||
458 | void | |
459 | switch_thru_all_uis_init (struct switch_thru_all_uis *state) | |
460 | { | |
461 | state->iter = ui_list; | |
462 | state->old_chain = make_cleanup (restore_ui_cleanup, current_ui); | |
463 | } | |
464 | ||
465 | /* See top.h. */ | |
466 | ||
467 | int | |
468 | switch_thru_all_uis_cond (struct switch_thru_all_uis *state) | |
469 | { | |
470 | if (state->iter != NULL) | |
471 | { | |
472 | current_ui = state->iter; | |
473 | return 1; | |
474 | } | |
475 | else | |
476 | { | |
477 | do_cleanups (state->old_chain); | |
478 | return 0; | |
479 | } | |
480 | } | |
481 | ||
482 | /* See top.h. */ | |
483 | ||
484 | void | |
485 | switch_thru_all_uis_next (struct switch_thru_all_uis *state) | |
486 | { | |
487 | state->iter = state->iter->next; | |
488 | } | |
a74e1786 PA |
489 | |
490 | /* Get a pointer to the current UI's line buffer. This is used to | |
b69d38af PA |
491 | construct a whole line of input from partial input. */ |
492 | ||
493 | static struct buffer * | |
494 | get_command_line_buffer (void) | |
495 | { | |
a74e1786 | 496 | return ¤t_ui->line_buffer; |
b69d38af PA |
497 | } |
498 | ||
187212b3 | 499 | /* When there is an event ready on the stdin file descriptor, instead |
c2c6d25f | 500 | of calling readline directly throught the callback function, or |
c70061cf PA |
501 | instead of calling gdb_readline_no_editing_callback, give gdb a |
502 | chance to detect errors and do something. */ | |
503 | ||
c2c6d25f | 504 | void |
2acceee2 | 505 | stdin_event_handler (int error, gdb_client_data client_data) |
c2c6d25f | 506 | { |
a74e1786 PA |
507 | struct ui *ui = current_ui; |
508 | ||
c2c6d25f JM |
509 | if (error) |
510 | { | |
a3f17187 | 511 | printf_unfiltered (_("error detected on stdin\n")); |
2acceee2 | 512 | delete_file_handler (input_fd); |
371d5dec | 513 | /* If stdin died, we may as well kill gdb. */ |
c5394b80 | 514 | quit_command ((char *) 0, stdin == instream); |
c2c6d25f JM |
515 | } |
516 | else | |
d64e57fa | 517 | { |
d2acc30b PA |
518 | /* This makes sure a ^C immediately followed by further input is |
519 | always processed in that order. E.g,. with input like | |
520 | "^Cprint 1\n", the SIGINT handler runs, marks the async signal | |
521 | handler, and then select/poll may return with stdin ready, | |
522 | instead of -1/EINTR. The | |
523 | gdb.base/double-prompt-target-event-error.exp test exercises | |
524 | this. */ | |
525 | QUIT; | |
526 | ||
d64e57fa PP |
527 | do |
528 | { | |
529 | call_stdin_event_handler_again_p = 0; | |
a74e1786 | 530 | ui->call_readline (client_data); |
d64e57fa PP |
531 | } while (call_stdin_event_handler_again_p != 0); |
532 | } | |
c2c6d25f JM |
533 | } |
534 | ||
6426a772 JM |
535 | /* Re-enable stdin after the end of an execution command in |
536 | synchronous mode, or after an error from the target, and we aborted | |
371d5dec | 537 | the exec operation. */ |
6426a772 JM |
538 | |
539 | void | |
712af3be | 540 | async_enable_stdin (void) |
6426a772 | 541 | { |
32c1e744 VP |
542 | if (sync_execution) |
543 | { | |
371d5dec | 544 | /* See NOTE in async_disable_stdin(). */ |
32c1e744 VP |
545 | /* FIXME: cagney/1999-09-27: Call this before clearing |
546 | sync_execution. Current target_terminal_ours() implementations | |
371d5dec | 547 | check for sync_execution before switching the terminal. */ |
32c1e744 | 548 | target_terminal_ours (); |
32c1e744 VP |
549 | sync_execution = 0; |
550 | } | |
6426a772 JM |
551 | } |
552 | ||
553 | /* Disable reads from stdin (the console) marking the command as | |
371d5dec | 554 | synchronous. */ |
6426a772 JM |
555 | |
556 | void | |
557 | async_disable_stdin (void) | |
558 | { | |
ab821bc6 | 559 | sync_execution = 1; |
6426a772 | 560 | } |
b5a0ac70 | 561 | \f |
6426a772 | 562 | |
b69d38af PA |
563 | /* Handle a gdb command line. This function is called when |
564 | handle_line_of_input has concatenated one or more input lines into | |
565 | a whole command. */ | |
566 | ||
567 | void | |
c2c6d25f | 568 | command_handler (char *command) |
b5a0ac70 | 569 | { |
0f3bb72e | 570 | struct cleanup *stat_chain; |
b69d38af | 571 | char *c; |
b5a0ac70 | 572 | |
bc008695 | 573 | if (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 | { | |
583 | execute_command (command, 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 | { | |
650 | char *p1; | |
651 | char *cmd; | |
652 | ||
653 | if (rl == NULL) | |
654 | return (char *) EOF; | |
655 | ||
656 | cmd = command_line_append_input_line (cmd_line_buffer, rl); | |
657 | if (cmd == NULL) | |
658 | return NULL; | |
b5a0ac70 | 659 | |
b69d38af PA |
660 | /* We have a complete command line now. Prepare for the next |
661 | command, but leave ownership of memory to the buffer . */ | |
662 | cmd_line_buffer->used_size = 0; | |
663 | ||
664 | if (annotation_level > 1 && instream == stdin) | |
b5a0ac70 | 665 | { |
b69d38af PA |
666 | printf_unfiltered (("\n\032\032post-")); |
667 | puts_unfiltered (annotation_suffix); | |
668 | printf_unfiltered (("\n")); | |
669 | } | |
670 | ||
671 | #define SERVER_COMMAND_PREFIX "server " | |
672 | if (startswith (cmd, SERVER_COMMAND_PREFIX)) | |
673 | { | |
674 | /* Note that we don't set `saved_command_line'. Between this | |
675 | and the check in dont_repeat, this insures that repeating | |
676 | will still do the right thing. */ | |
677 | return cmd + strlen (SERVER_COMMAND_PREFIX); | |
b5a0ac70 SS |
678 | } |
679 | ||
680 | /* Do history expansion if that is wished. */ | |
681 | if (history_expansion_p && instream == stdin | |
682 | && ISATTY (instream)) | |
683 | { | |
684 | char *history_value; | |
685 | int expanded; | |
686 | ||
b69d38af | 687 | expanded = history_expand (cmd, &history_value); |
b5a0ac70 SS |
688 | if (expanded) |
689 | { | |
b69d38af PA |
690 | size_t len; |
691 | ||
b5a0ac70 SS |
692 | /* Print the changes. */ |
693 | printf_unfiltered ("%s\n", history_value); | |
694 | ||
695 | /* If there was an error, call this function again. */ | |
696 | if (expanded < 0) | |
697 | { | |
b8c9b27d | 698 | xfree (history_value); |
b69d38af | 699 | return cmd; |
b5a0ac70 | 700 | } |
b69d38af PA |
701 | |
702 | /* history_expand returns an allocated string. Just replace | |
703 | our buffer with it. */ | |
704 | len = strlen (history_value); | |
705 | xfree (buffer_finish (cmd_line_buffer)); | |
706 | cmd_line_buffer->buffer = history_value; | |
707 | cmd_line_buffer->buffer_size = len + 1; | |
708 | cmd = history_value; | |
b5a0ac70 SS |
709 | } |
710 | } | |
711 | ||
371d5dec | 712 | /* If we just got an empty line, and that is supposed to repeat the |
b69d38af PA |
713 | previous command, return the previously saved command. */ |
714 | for (p1 = cmd; *p1 == ' ' || *p1 == '\t'; p1++) | |
715 | ; | |
716 | if (repeat && *p1 == '\0') | |
717 | return saved_command_line; | |
718 | ||
719 | /* Add command to history if appropriate. Note: lines consisting | |
720 | solely of comments are also added to the command history. This | |
721 | is useful when you type a command, and then realize you don't | |
722 | want to execute it quite yet. You can comment out the command | |
723 | and then later fetch it from the value history and remove the | |
724 | '#'. The kill ring is probably better, but some people are in | |
725 | the habit of commenting things out. */ | |
726 | if (*cmd != '\0' && input_from_terminal_p ()) | |
727 | gdb_add_history (cmd); | |
b5a0ac70 | 728 | |
b69d38af PA |
729 | /* Save into global buffer if appropriate. */ |
730 | if (repeat) | |
b5a0ac70 | 731 | { |
b69d38af PA |
732 | xfree (saved_command_line); |
733 | saved_command_line = xstrdup (cmd); | |
734 | return saved_command_line; | |
b5a0ac70 | 735 | } |
b69d38af PA |
736 | else |
737 | return cmd; | |
738 | } | |
b5a0ac70 | 739 | |
b69d38af PA |
740 | /* Handle a complete line of input. This is called by the callback |
741 | mechanism within the readline library. Deal with incomplete | |
742 | commands as well, by saving the partial input in a global | |
743 | buffer. | |
b5a0ac70 | 744 | |
b69d38af PA |
745 | NOTE: This is the asynchronous version of the command_line_input |
746 | function. */ | |
b5a0ac70 | 747 | |
b69d38af PA |
748 | void |
749 | command_line_handler (char *rl) | |
750 | { | |
751 | struct buffer *line_buffer = get_command_line_buffer (); | |
752 | char *cmd; | |
b5a0ac70 | 753 | |
b69d38af PA |
754 | cmd = handle_line_of_input (line_buffer, rl, instream == stdin, "prompt"); |
755 | if (cmd == (char *) EOF) | |
b5a0ac70 | 756 | { |
b69d38af PA |
757 | /* stdin closed. The connection with the terminal is gone. |
758 | This happens at the end of a testsuite run, after Expect has | |
759 | hung up but GDB is still alive. In such a case, we just quit | |
760 | gdb killing the inferior program too. */ | |
761 | printf_unfiltered ("quit\n"); | |
762 | execute_command ("quit", stdin == instream); | |
763 | } | |
764 | else if (cmd == NULL) | |
765 | { | |
766 | /* We don't have a full line yet. Print an empty prompt. */ | |
767 | display_gdb_prompt (""); | |
768 | } | |
769 | else | |
770 | { | |
771 | command_handler (cmd); | |
772 | display_gdb_prompt (0); | |
b5a0ac70 | 773 | } |
b5a0ac70 SS |
774 | } |
775 | ||
776 | /* Does reading of input from terminal w/o the editing features | |
c70061cf PA |
777 | provided by the readline library. Calls the line input handler |
778 | once we have a whole input line. */ | |
b5a0ac70 | 779 | |
085dd6e6 | 780 | void |
c70061cf | 781 | gdb_readline_no_editing_callback (gdb_client_data client_data) |
b5a0ac70 SS |
782 | { |
783 | int c; | |
784 | char *result; | |
187212b3 | 785 | struct buffer line_buffer; |
7be570e7 | 786 | static int done_once = 0; |
a74e1786 | 787 | struct ui *ui = current_ui; |
7be570e7 | 788 | |
187212b3 PA |
789 | buffer_init (&line_buffer); |
790 | ||
7be570e7 | 791 | /* Unbuffer the input stream, so that, later on, the calls to fgetc |
371d5dec | 792 | fetch only one char at the time from the stream. The fgetc's will |
7be570e7 | 793 | get up to the first newline, but there may be more chars in the |
371d5dec | 794 | stream after '\n'. If we buffer the input and fgetc drains the |
7be570e7 | 795 | stream, getting stuff beyond the newline as well, a select, done |
371d5dec | 796 | afterwards will not trigger. */ |
7be570e7 JM |
797 | if (!done_once && !ISATTY (instream)) |
798 | { | |
799 | setbuf (instream, NULL); | |
800 | done_once = 1; | |
801 | } | |
b5a0ac70 | 802 | |
b5a0ac70 | 803 | /* We still need the while loop here, even though it would seem |
c70061cf PA |
804 | obvious to invoke gdb_readline_no_editing_callback at every |
805 | character entered. If not using the readline library, the | |
806 | terminal is in cooked mode, which sends the characters all at | |
807 | once. Poll will notice that the input fd has changed state only | |
808 | after enter is pressed. At this point we still need to fetch all | |
809 | the chars entered. */ | |
b5a0ac70 SS |
810 | |
811 | while (1) | |
812 | { | |
813 | /* Read from stdin if we are executing a user defined command. | |
814 | This is the right thing for prompt_for_continue, at least. */ | |
815 | c = fgetc (instream ? instream : stdin); | |
816 | ||
817 | if (c == EOF) | |
818 | { | |
187212b3 PA |
819 | if (line_buffer.used_size > 0) |
820 | { | |
821 | /* The last line does not end with a newline. Return it, and | |
822 | if we are called again fgetc will still return EOF and | |
823 | we'll return NULL then. */ | |
824 | break; | |
825 | } | |
826 | xfree (buffer_finish (&line_buffer)); | |
a74e1786 | 827 | ui->input_handler (NULL); |
13ce7133 | 828 | return; |
b5a0ac70 SS |
829 | } |
830 | ||
831 | if (c == '\n') | |
b5a0ac70 | 832 | { |
187212b3 PA |
833 | if (line_buffer.used_size > 0 |
834 | && line_buffer.buffer[line_buffer.used_size - 1] == '\r') | |
835 | line_buffer.used_size--; | |
b5a0ac70 SS |
836 | break; |
837 | } | |
b5a0ac70 | 838 | |
187212b3 | 839 | buffer_grow_char (&line_buffer, c); |
b5a0ac70 SS |
840 | } |
841 | ||
187212b3 PA |
842 | buffer_grow_char (&line_buffer, '\0'); |
843 | result = buffer_finish (&line_buffer); | |
a74e1786 | 844 | ui->input_handler (result); |
b5a0ac70 SS |
845 | } |
846 | \f | |
847 | ||
f0881b37 PA |
848 | /* The serial event associated with the QUIT flag. set_quit_flag sets |
849 | this, and check_quit_flag clears it. Used by interruptible_select | |
850 | to be able to do interruptible I/O with no race with the SIGINT | |
851 | handler. */ | |
852 | static struct serial_event *quit_serial_event; | |
853 | ||
b5a0ac70 | 854 | /* Initialization of signal handlers and tokens. There is a function |
371d5dec | 855 | handle_sig* for each of the signals GDB cares about. Specifically: |
b5a0ac70 SS |
856 | SIGINT, SIGFPE, SIGQUIT, SIGTSTP, SIGHUP, SIGWINCH. These |
857 | functions are the actual signal handlers associated to the signals | |
858 | via calls to signal(). The only job for these functions is to | |
859 | enqueue the appropriate event/procedure with the event loop. Such | |
371d5dec | 860 | procedures are the old signal handlers. The event loop will take |
b5a0ac70 | 861 | care of invoking the queued procedures to perform the usual tasks |
371d5dec | 862 | associated with the reception of the signal. */ |
392a587b | 863 | /* NOTE: 1999-04-30 This is the asynchronous version of init_signals. |
b5a0ac70 | 864 | init_signals will become obsolete as we move to have to event loop |
371d5dec | 865 | as the default for gdb. */ |
b5a0ac70 | 866 | void |
c2c6d25f | 867 | async_init_signals (void) |
c5aa993b | 868 | { |
5cc3ce8b PA |
869 | initialize_async_signal_handlers (); |
870 | ||
f0881b37 PA |
871 | quit_serial_event = make_serial_event (); |
872 | ||
b5a0ac70 SS |
873 | signal (SIGINT, handle_sigint); |
874 | sigint_token = | |
0f71a2f6 | 875 | create_async_signal_handler (async_request_quit, NULL); |
a7266fef | 876 | signal (SIGTERM, handle_sigterm); |
06c868a8 JK |
877 | async_sigterm_token |
878 | = create_async_signal_handler (async_sigterm_handler, NULL); | |
b5a0ac70 SS |
879 | |
880 | /* If SIGTRAP was set to SIG_IGN, then the SIG_IGN will get passed | |
881 | to the inferior and breakpoints will be ignored. */ | |
882 | #ifdef SIGTRAP | |
883 | signal (SIGTRAP, SIG_DFL); | |
884 | #endif | |
885 | ||
6d318c73 | 886 | #ifdef SIGQUIT |
b5a0ac70 SS |
887 | /* If we initialize SIGQUIT to SIG_IGN, then the SIG_IGN will get |
888 | passed to the inferior, which we don't want. It would be | |
889 | possible to do a "signal (SIGQUIT, SIG_DFL)" after we fork, but | |
890 | on BSD4.3 systems using vfork, that can affect the | |
891 | GDB process as well as the inferior (the signal handling tables | |
892 | might be in memory, shared between the two). Since we establish | |
893 | a handler for SIGQUIT, when we call exec it will set the signal | |
894 | to SIG_DFL for us. */ | |
895 | signal (SIGQUIT, handle_sigquit); | |
896 | sigquit_token = | |
0f71a2f6 | 897 | create_async_signal_handler (async_do_nothing, NULL); |
6d318c73 | 898 | #endif |
b5a0ac70 SS |
899 | #ifdef SIGHUP |
900 | if (signal (SIGHUP, handle_sighup) != SIG_IGN) | |
901 | sighup_token = | |
0f71a2f6 | 902 | create_async_signal_handler (async_disconnect, NULL); |
b5a0ac70 SS |
903 | else |
904 | sighup_token = | |
0f71a2f6 | 905 | create_async_signal_handler (async_do_nothing, NULL); |
b5a0ac70 SS |
906 | #endif |
907 | signal (SIGFPE, handle_sigfpe); | |
908 | sigfpe_token = | |
0f71a2f6 | 909 | create_async_signal_handler (async_float_handler, NULL); |
b5a0ac70 | 910 | |
0f71a2f6 JM |
911 | #ifdef STOP_SIGNAL |
912 | sigtstp_token = | |
913 | create_async_signal_handler (async_stop_sig, NULL); | |
914 | #endif | |
0f71a2f6 JM |
915 | } |
916 | ||
f0881b37 PA |
917 | /* See defs.h. */ |
918 | ||
919 | void | |
920 | quit_serial_event_set (void) | |
921 | { | |
922 | serial_event_set (quit_serial_event); | |
923 | } | |
924 | ||
925 | /* See defs.h. */ | |
926 | ||
927 | void | |
928 | quit_serial_event_clear (void) | |
929 | { | |
930 | serial_event_clear (quit_serial_event); | |
931 | } | |
932 | ||
933 | /* Return the selectable file descriptor of the serial event | |
934 | associated with the quit flag. */ | |
935 | ||
936 | static int | |
937 | quit_serial_event_fd (void) | |
938 | { | |
939 | return serial_event_fd (quit_serial_event); | |
940 | } | |
941 | ||
048094ac PA |
942 | /* See defs.h. */ |
943 | ||
944 | void | |
945 | default_quit_handler (void) | |
946 | { | |
947 | if (check_quit_flag ()) | |
948 | { | |
949 | if (target_terminal_is_ours ()) | |
950 | quit (); | |
951 | else | |
952 | target_pass_ctrlc (); | |
953 | } | |
954 | } | |
955 | ||
956 | /* See defs.h. */ | |
957 | quit_handler_ftype *quit_handler = default_quit_handler; | |
958 | ||
959 | /* Data for make_cleanup_override_quit_handler. Wrap the previous | |
960 | handler pointer in a data struct because it's not portable to cast | |
961 | a function pointer to a data pointer, which is what make_cleanup | |
962 | expects. */ | |
963 | struct quit_handler_cleanup_data | |
964 | { | |
965 | /* The previous quit handler. */ | |
966 | quit_handler_ftype *prev_handler; | |
967 | }; | |
968 | ||
969 | /* Cleanup call that restores the previous quit handler. */ | |
970 | ||
971 | static void | |
972 | restore_quit_handler (void *arg) | |
973 | { | |
974 | struct quit_handler_cleanup_data *data | |
975 | = (struct quit_handler_cleanup_data *) arg; | |
976 | ||
977 | quit_handler = data->prev_handler; | |
978 | } | |
979 | ||
980 | /* Destructor for the quit handler cleanup. */ | |
981 | ||
982 | static void | |
983 | restore_quit_handler_dtor (void *arg) | |
984 | { | |
985 | xfree (arg); | |
986 | } | |
987 | ||
988 | /* See defs.h. */ | |
989 | ||
990 | struct cleanup * | |
991 | make_cleanup_override_quit_handler (quit_handler_ftype *new_quit_handler) | |
992 | { | |
993 | struct cleanup *old_chain; | |
994 | struct quit_handler_cleanup_data *data; | |
995 | ||
996 | data = XNEW (struct quit_handler_cleanup_data); | |
997 | data->prev_handler = quit_handler; | |
998 | old_chain = make_cleanup_dtor (restore_quit_handler, data, | |
999 | restore_quit_handler_dtor); | |
1000 | quit_handler = new_quit_handler; | |
1001 | return old_chain; | |
1002 | } | |
1003 | ||
f0881b37 PA |
1004 | /* Handle a SIGINT. */ |
1005 | ||
c5aa993b | 1006 | void |
c2c6d25f | 1007 | handle_sigint (int sig) |
b5a0ac70 SS |
1008 | { |
1009 | signal (sig, handle_sigint); | |
1010 | ||
5f960e00 FF |
1011 | /* We could be running in a loop reading in symfiles or something so |
1012 | it may be quite a while before we get back to the event loop. So | |
371d5dec | 1013 | set quit_flag to 1 here. Then if QUIT is called before we get to |
5f960e00 | 1014 | the event loop, we will unwind as expected. */ |
522002f9 | 1015 | set_quit_flag (); |
5f960e00 | 1016 | |
585a46a2 PA |
1017 | /* In case nothing calls QUIT before the event loop is reached, the |
1018 | event loop handles it. */ | |
1019 | mark_async_signal_handler (sigint_token); | |
b5a0ac70 SS |
1020 | } |
1021 | ||
f0881b37 PA |
1022 | /* See gdb_select.h. */ |
1023 | ||
1024 | int | |
1025 | interruptible_select (int n, | |
1026 | fd_set *readfds, fd_set *writefds, fd_set *exceptfds, | |
1027 | struct timeval *timeout) | |
1028 | { | |
1029 | fd_set my_readfds; | |
1030 | int fd; | |
1031 | int res; | |
1032 | ||
1033 | if (readfds == NULL) | |
1034 | { | |
1035 | readfds = &my_readfds; | |
1036 | FD_ZERO (&my_readfds); | |
1037 | } | |
1038 | ||
1039 | fd = quit_serial_event_fd (); | |
1040 | FD_SET (fd, readfds); | |
1041 | if (n <= fd) | |
1042 | n = fd + 1; | |
1043 | ||
1044 | do | |
1045 | { | |
1046 | res = gdb_select (n, readfds, writefds, exceptfds, timeout); | |
1047 | } | |
1048 | while (res == -1 && errno == EINTR); | |
1049 | ||
1050 | if (res == 1 && FD_ISSET (fd, readfds)) | |
1051 | { | |
1052 | errno = EINTR; | |
1053 | return -1; | |
1054 | } | |
1055 | return res; | |
1056 | } | |
1057 | ||
06c868a8 JK |
1058 | /* Handle GDB exit upon receiving SIGTERM if target_can_async_p (). */ |
1059 | ||
1060 | static void | |
1061 | async_sigterm_handler (gdb_client_data arg) | |
1062 | { | |
1063 | quit_force (NULL, stdin == instream); | |
1064 | } | |
1065 | ||
1066 | /* See defs.h. */ | |
1067 | volatile int sync_quit_force_run; | |
1068 | ||
a7266fef AS |
1069 | /* Quit GDB if SIGTERM is received. |
1070 | GDB would quit anyway, but this way it will clean up properly. */ | |
1071 | void | |
1072 | handle_sigterm (int sig) | |
1073 | { | |
1074 | signal (sig, handle_sigterm); | |
06c868a8 | 1075 | |
077836f7 PP |
1076 | sync_quit_force_run = 1; |
1077 | set_quit_flag (); | |
1078 | ||
1079 | mark_async_signal_handler (async_sigterm_token); | |
a7266fef AS |
1080 | } |
1081 | ||
371d5dec | 1082 | /* Do the quit. All the checks have been done by the caller. */ |
c5aa993b | 1083 | void |
c2c6d25f | 1084 | async_request_quit (gdb_client_data arg) |
b5a0ac70 | 1085 | { |
5f960e00 | 1086 | /* If the quit_flag has gotten reset back to 0 by the time we get |
4ac94eda FF |
1087 | back here, that means that an exception was thrown to unwind the |
1088 | current command before we got back to the event loop. So there | |
522002f9 | 1089 | is no reason to call quit again here. */ |
048094ac | 1090 | QUIT; |
b5a0ac70 SS |
1091 | } |
1092 | ||
6d318c73 | 1093 | #ifdef SIGQUIT |
371d5dec MS |
1094 | /* Tell the event loop what to do if SIGQUIT is received. |
1095 | See event-signal.c. */ | |
c5aa993b | 1096 | static void |
c2c6d25f | 1097 | handle_sigquit (int sig) |
b5a0ac70 | 1098 | { |
f6fbab7d | 1099 | mark_async_signal_handler (sigquit_token); |
b5a0ac70 SS |
1100 | signal (sig, handle_sigquit); |
1101 | } | |
6d318c73 | 1102 | #endif |
b5a0ac70 | 1103 | |
0f0b8dcd DJ |
1104 | #if defined (SIGQUIT) || defined (SIGHUP) |
1105 | /* Called by the event loop in response to a SIGQUIT or an | |
1106 | ignored SIGHUP. */ | |
c5aa993b | 1107 | static void |
c2c6d25f | 1108 | async_do_nothing (gdb_client_data arg) |
b5a0ac70 | 1109 | { |
371d5dec | 1110 | /* Empty function body. */ |
b5a0ac70 | 1111 | } |
0f0b8dcd | 1112 | #endif |
b5a0ac70 SS |
1113 | |
1114 | #ifdef SIGHUP | |
371d5dec MS |
1115 | /* Tell the event loop what to do if SIGHUP is received. |
1116 | See event-signal.c. */ | |
c5aa993b | 1117 | static void |
fba45db2 | 1118 | handle_sighup (int sig) |
b5a0ac70 | 1119 | { |
f6fbab7d | 1120 | mark_async_signal_handler (sighup_token); |
b5a0ac70 SS |
1121 | signal (sig, handle_sighup); |
1122 | } | |
1123 | ||
371d5dec | 1124 | /* Called by the event loop to process a SIGHUP. */ |
c5aa993b | 1125 | static void |
c2c6d25f | 1126 | async_disconnect (gdb_client_data arg) |
b5a0ac70 | 1127 | { |
b2cd6b29 | 1128 | |
492d29ea | 1129 | TRY |
b2cd6b29 JM |
1130 | { |
1131 | quit_cover (); | |
1132 | } | |
1133 | ||
492d29ea | 1134 | CATCH (exception, RETURN_MASK_ALL) |
b2cd6b29 JM |
1135 | { |
1136 | fputs_filtered ("Could not kill the program being debugged", | |
1137 | gdb_stderr); | |
1138 | exception_print (gdb_stderr, exception); | |
1139 | } | |
492d29ea | 1140 | END_CATCH |
b2cd6b29 | 1141 | |
492d29ea | 1142 | TRY |
b2cd6b29 | 1143 | { |
460014f5 | 1144 | pop_all_targets (); |
b2cd6b29 | 1145 | } |
492d29ea PA |
1146 | CATCH (exception, RETURN_MASK_ALL) |
1147 | { | |
1148 | } | |
1149 | END_CATCH | |
b2cd6b29 | 1150 | |
371d5dec | 1151 | signal (SIGHUP, SIG_DFL); /*FIXME: ??????????? */ |
ec4dfccf | 1152 | raise (SIGHUP); |
b5a0ac70 SS |
1153 | } |
1154 | #endif | |
1155 | ||
0f71a2f6 | 1156 | #ifdef STOP_SIGNAL |
c5aa993b | 1157 | void |
c2c6d25f | 1158 | handle_stop_sig (int sig) |
0f71a2f6 | 1159 | { |
f6fbab7d | 1160 | mark_async_signal_handler (sigtstp_token); |
c5aa993b | 1161 | signal (sig, handle_stop_sig); |
0f71a2f6 JM |
1162 | } |
1163 | ||
1164 | static void | |
c2c6d25f | 1165 | async_stop_sig (gdb_client_data arg) |
0f71a2f6 | 1166 | { |
ab821bc6 | 1167 | char *prompt = get_prompt (); |
d7f9d729 | 1168 | |
0f71a2f6 JM |
1169 | #if STOP_SIGNAL == SIGTSTP |
1170 | signal (SIGTSTP, SIG_DFL); | |
2acceee2 JM |
1171 | #if HAVE_SIGPROCMASK |
1172 | { | |
1173 | sigset_t zero; | |
46711df8 | 1174 | |
2acceee2 JM |
1175 | sigemptyset (&zero); |
1176 | sigprocmask (SIG_SETMASK, &zero, 0); | |
1177 | } | |
46711df8 | 1178 | #elif HAVE_SIGSETMASK |
0f71a2f6 | 1179 | sigsetmask (0); |
2acceee2 | 1180 | #endif |
ec4dfccf | 1181 | raise (SIGTSTP); |
0f71a2f6 JM |
1182 | signal (SIGTSTP, handle_stop_sig); |
1183 | #else | |
1184 | signal (STOP_SIGNAL, handle_stop_sig); | |
1185 | #endif | |
1186 | printf_unfiltered ("%s", prompt); | |
1187 | gdb_flush (gdb_stdout); | |
1188 | ||
371d5dec MS |
1189 | /* Forget about any previous command -- null line now will do |
1190 | nothing. */ | |
0f71a2f6 JM |
1191 | dont_repeat (); |
1192 | } | |
1193 | #endif /* STOP_SIGNAL */ | |
1194 | ||
371d5dec MS |
1195 | /* Tell the event loop what to do if SIGFPE is received. |
1196 | See event-signal.c. */ | |
c5aa993b | 1197 | static void |
c2c6d25f | 1198 | handle_sigfpe (int sig) |
b5a0ac70 | 1199 | { |
f6fbab7d | 1200 | mark_async_signal_handler (sigfpe_token); |
b5a0ac70 SS |
1201 | signal (sig, handle_sigfpe); |
1202 | } | |
1203 | ||
371d5dec | 1204 | /* Event loop will call this functin to process a SIGFPE. */ |
c5aa993b | 1205 | static void |
c2c6d25f | 1206 | async_float_handler (gdb_client_data arg) |
b5a0ac70 | 1207 | { |
371d5dec MS |
1208 | /* This message is based on ANSI C, section 4.7. Note that integer |
1209 | divide by zero causes this, so "float" is a misnomer. */ | |
8a3fe4f8 | 1210 | error (_("Erroneous arithmetic operation.")); |
b5a0ac70 | 1211 | } |
b5a0ac70 SS |
1212 | \f |
1213 | ||
1214 | /* Called by do_setshow_command. */ | |
b5a0ac70 | 1215 | void |
371d5dec MS |
1216 | set_async_editing_command (char *args, int from_tty, |
1217 | struct cmd_list_element *c) | |
b5a0ac70 SS |
1218 | { |
1219 | change_line_handler (); | |
1220 | } | |
1221 | ||
0f71a2f6 | 1222 | /* Set things up for readline to be invoked via the alternate |
3c610247 PA |
1223 | interface, i.e. via a callback function |
1224 | (gdb_rl_callback_read_char), and hook up instream to the event | |
1225 | loop. */ | |
1226 | ||
0f71a2f6 | 1227 | void |
cee6ddeb | 1228 | gdb_setup_readline (void) |
0f71a2f6 | 1229 | { |
a74e1786 PA |
1230 | struct ui *ui = current_ui; |
1231 | ||
362646f5 AC |
1232 | /* This function is a noop for the sync case. The assumption is |
1233 | that the sync setup is ALL done in gdb_init, and we would only | |
1234 | mess it up here. The sync stuff should really go away over | |
1235 | time. */ | |
1a088d06 AS |
1236 | if (!batch_silent) |
1237 | gdb_stdout = stdio_fileopen (stdout); | |
ffa4ac95 | 1238 | gdb_stderr = stderr_fileopen (); |
362646f5 AC |
1239 | gdb_stdlog = gdb_stderr; /* for moment */ |
1240 | gdb_stdtarg = gdb_stderr; /* for moment */ | |
8d4d924b | 1241 | gdb_stdtargerr = gdb_stderr; /* for moment */ |
362646f5 AC |
1242 | |
1243 | /* If the input stream is connected to a terminal, turn on | |
1244 | editing. */ | |
1245 | if (ISATTY (instream)) | |
9e0b60a8 | 1246 | { |
371d5dec | 1247 | /* Tell gdb that we will be using the readline library. This |
362646f5 AC |
1248 | could be overwritten by a command in .gdbinit like 'set |
1249 | editing on' or 'off'. */ | |
1250 | async_command_editing_p = 1; | |
c5201926 | 1251 | |
362646f5 AC |
1252 | /* When a character is detected on instream by select or poll, |
1253 | readline will be invoked via this callback function. */ | |
a74e1786 | 1254 | ui->call_readline = gdb_rl_callback_read_char_wrapper; |
9e0b60a8 | 1255 | } |
362646f5 AC |
1256 | else |
1257 | { | |
1258 | async_command_editing_p = 0; | |
a74e1786 | 1259 | ui->call_readline = gdb_readline_no_editing_callback; |
362646f5 AC |
1260 | } |
1261 | ||
1262 | /* When readline has read an end-of-line character, it passes the | |
371d5dec | 1263 | complete line to gdb for processing; command_line_handler is the |
362646f5 | 1264 | function that does this. */ |
a74e1786 PA |
1265 | ui->input_handler = command_line_handler; |
1266 | ||
371d5dec | 1267 | /* Tell readline to use the same input stream that gdb uses. */ |
362646f5 AC |
1268 | rl_instream = instream; |
1269 | ||
1270 | /* Get a file descriptor for the input stream, so that we can | |
1271 | register it with the event loop. */ | |
1272 | input_fd = fileno (instream); | |
1273 | ||
1274 | /* Now we need to create the event sources for the input file | |
1275 | descriptor. */ | |
1276 | /* At this point in time, this is the only event source that we | |
371d5dec | 1277 | register with the even loop. Another source is going to be the |
362646f5 AC |
1278 | target program (inferior), but that must be registered only when |
1279 | it actually exists (I.e. after we say 'run' or after we connect | |
1280 | to a remote target. */ | |
1281 | add_file_handler (input_fd, stdin_event_handler, 0); | |
0f71a2f6 | 1282 | } |
cee6ddeb | 1283 | |
7d5b6fdd EZ |
1284 | /* Disable command input through the standard CLI channels. Used in |
1285 | the suspend proc for interpreters that use the standard gdb readline | |
1286 | interface, like the cli & the mi. */ | |
1287 | void | |
1288 | gdb_disable_readline (void) | |
1289 | { | |
362646f5 AC |
1290 | /* FIXME - It is too heavyweight to delete and remake these every |
1291 | time you run an interpreter that needs readline. It is probably | |
1292 | better to have the interpreters cache these, which in turn means | |
1293 | that this needs to be moved into interpreter specific code. */ | |
7d5b6fdd EZ |
1294 | |
1295 | #if 0 | |
362646f5 AC |
1296 | ui_file_delete (gdb_stdout); |
1297 | ui_file_delete (gdb_stderr); | |
1298 | gdb_stdlog = NULL; | |
1299 | gdb_stdtarg = NULL; | |
8d4d924b | 1300 | gdb_stdtargerr = NULL; |
7d5b6fdd EZ |
1301 | #endif |
1302 | ||
d3d4baed | 1303 | gdb_rl_callback_handler_remove (); |
362646f5 | 1304 | delete_file_handler (input_fd); |
7d5b6fdd | 1305 | } |