Commit | Line | Data |
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b5a0ac70 | 1 | /* Top level stuff for GDB, the GNU debugger. |
637537d0 | 2 | |
b811d2c2 | 3 | Copyright (C) 1999-2020 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" | |
4de283e4 | 23 | #include "top.h" |
d55e5aa6 TT |
24 | #include "inferior.h" |
25 | #include "infrun.h" | |
4de283e4 | 26 | #include "target.h" |
766f8836 | 27 | #include "terminal.h" |
400b5eca | 28 | #include "gdbsupport/event-loop.h" |
4de283e4 | 29 | #include "event-top.h" |
4389a95a | 30 | #include "interps.h" |
4de283e4 TT |
31 | #include <signal.h> |
32 | #include "cli/cli-script.h" /* for reset_command_nest_depth */ | |
d01a8610 | 33 | #include "main.h" |
4de283e4 | 34 | #include "gdbthread.h" |
d55e5aa6 | 35 | #include "observable.h" |
4de283e4 TT |
36 | #include "continuations.h" |
37 | #include "gdbcmd.h" /* for dont_repeat() */ | |
38 | #include "annotate.h" | |
39 | #include "maint.h" | |
268a13a5 | 40 | #include "gdbsupport/buffer.h" |
f0881b37 | 41 | #include "ser-event.h" |
06cc9596 | 42 | #include "gdbsupport/gdb_select.h" |
21987b9c | 43 | #include "gdbsupport/gdb-sigmask.h" |
93b54c8e | 44 | #include "async-event.h" |
104c1213 | 45 | |
371d5dec | 46 | /* readline include files. */ |
dbda9972 AC |
47 | #include "readline/readline.h" |
48 | #include "readline/history.h" | |
b5a0ac70 SS |
49 | |
50 | /* readline defines this. */ | |
51 | #undef savestring | |
52 | ||
606aae8a | 53 | static std::string top_level_prompt (); |
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); |
6aa899ce PA |
73 | #ifdef SIGTSTP |
74 | static void async_sigtstp_handler (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. */ |
491144b5 | 91 | bool set_editing_cmd_var; |
b5a0ac70 | 92 | |
104c1213 | 93 | /* This is used to display the notification of the completion of an |
371d5dec | 94 | asynchronous execution command. */ |
491144b5 | 95 | bool exec_done_display_p = false; |
104c1213 | 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; |
6aa899ce | 116 | #ifdef SIGTSTP |
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 | |
2693a262 PA |
162 | prompts / queries, through gdb_readline_wrapper. This must be |
163 | noexcept in order to avoid problems with mixing sjlj and | |
164 | (sjlj-based) C++ exceptions. */ | |
89525768 | 165 | |
2693a262 PA |
166 | static struct gdb_exception |
167 | gdb_rl_callback_read_char_wrapper_noexcept () noexcept | |
c2c6d25f | 168 | { |
cc06b668 | 169 | struct gdb_exception gdb_expt; |
89525768 PA |
170 | |
171 | /* C++ exceptions can't normally be thrown across readline (unless | |
172 | it is built with -fexceptions, but it won't by default on many | |
173 | ABIs). So we instead wrap the readline call with a sjlj-based | |
174 | TRY/CATCH, and rethrow the GDB exception once back in GDB. */ | |
175 | TRY_SJLJ | |
176 | { | |
177 | rl_callback_read_char (); | |
178 | if (after_char_processing_hook) | |
179 | (*after_char_processing_hook) (); | |
180 | } | |
181 | CATCH_SJLJ (ex, RETURN_MASK_ALL) | |
182 | { | |
c6fdd8b2 | 183 | gdb_expt = std::move (ex); |
89525768 PA |
184 | } |
185 | END_CATCH_SJLJ | |
186 | ||
2693a262 PA |
187 | return gdb_expt; |
188 | } | |
189 | ||
190 | static void | |
191 | gdb_rl_callback_read_char_wrapper (gdb_client_data client_data) | |
192 | { | |
193 | struct gdb_exception gdb_expt | |
194 | = gdb_rl_callback_read_char_wrapper_noexcept (); | |
195 | ||
89525768 PA |
196 | /* Rethrow using the normal EH mechanism. */ |
197 | if (gdb_expt.reason < 0) | |
94aeb44b | 198 | throw_exception (std::move (gdb_expt)); |
89525768 PA |
199 | } |
200 | ||
201 | /* GDB's readline callback handler. Calls the current INPUT_HANDLER, | |
202 | and propagates GDB exceptions/errors thrown from INPUT_HANDLER back | |
2693a262 PA |
203 | across readline. See gdb_rl_callback_read_char_wrapper. This must |
204 | be noexcept in order to avoid problems with mixing sjlj and | |
205 | (sjlj-based) C++ exceptions. */ | |
89525768 PA |
206 | |
207 | static void | |
2693a262 | 208 | gdb_rl_callback_handler (char *rl) noexcept |
89525768 | 209 | { |
3d1cbb78 TT |
210 | /* This is static to avoid undefined behavior when calling longjmp |
211 | -- gdb_exception has a destructor with side effects. */ | |
212 | static struct gdb_exception gdb_rl_expt; | |
a74e1786 | 213 | struct ui *ui = current_ui; |
89525768 | 214 | |
a70b8144 | 215 | try |
89525768 | 216 | { |
3d1cbb78 TT |
217 | /* Ensure the exception is reset on each call. */ |
218 | gdb_rl_expt = {}; | |
95bc9f0b | 219 | ui->input_handler (gdb::unique_xmalloc_ptr<char> (rl)); |
89525768 | 220 | } |
c6fdd8b2 | 221 | catch (gdb_exception &ex) |
89525768 | 222 | { |
c6fdd8b2 | 223 | gdb_rl_expt = std::move (ex); |
89525768 | 224 | } |
89525768 PA |
225 | |
226 | /* If we caught a GDB exception, longjmp out of the readline | |
227 | callback. There's no other way for the callback to signal to | |
228 | readline that an error happened. A normal return would have | |
229 | readline potentially continue processing further input, redisplay | |
230 | the prompt, etc. (This is what GDB historically did when it was | |
231 | a C program.) Note that since we're long jumping, local variable | |
232 | dtors are NOT run automatically. */ | |
233 | if (gdb_rl_expt.reason < 0) | |
234 | throw_exception_sjlj (gdb_rl_expt); | |
c2c6d25f JM |
235 | } |
236 | ||
b5a0ac70 | 237 | /* Change the function to be invoked every time there is a character |
371d5dec | 238 | ready on stdin. This is used when the user sets the editing off, |
b5a0ac70 | 239 | therefore bypassing readline, and letting gdb handle the input |
c70061cf PA |
240 | itself, via gdb_readline_no_editing_callback. Also it is used in |
241 | the opposite case in which the user sets editing on again, by | |
3c216924 PA |
242 | restoring readline handling of the input. |
243 | ||
244 | NOTE: this operates on input_fd, not instream. If we are reading | |
245 | commands from a file, instream will point to the file. However, we | |
246 | always read commands from a file with editing off. This means that | |
247 | the 'set editing on/off' will have effect only on the interactive | |
248 | session. */ | |
249 | ||
250 | void | |
251 | change_line_handler (int editing) | |
b5a0ac70 | 252 | { |
a74e1786 PA |
253 | struct ui *ui = current_ui; |
254 | ||
3c216924 PA |
255 | /* We can only have one instance of readline, so we only allow |
256 | editing on the main UI. */ | |
257 | if (ui != main_ui) | |
258 | return; | |
259 | ||
260 | /* Don't try enabling editing if the interpreter doesn't support it | |
261 | (e.g., MI). */ | |
262 | if (!interp_supports_command_editing (top_level_interpreter ()) | |
263 | || !interp_supports_command_editing (command_interp ())) | |
264 | return; | |
c2c6d25f | 265 | |
3c216924 | 266 | if (editing) |
b5a0ac70 | 267 | { |
3c216924 PA |
268 | gdb_assert (ui == main_ui); |
269 | ||
371d5dec | 270 | /* Turn on editing by using readline. */ |
a74e1786 | 271 | ui->call_readline = gdb_rl_callback_read_char_wrapper; |
b5a0ac70 SS |
272 | } |
273 | else | |
274 | { | |
c70061cf | 275 | /* Turn off editing by using gdb_readline_no_editing_callback. */ |
3c216924 PA |
276 | if (ui->command_editing) |
277 | gdb_rl_callback_handler_remove (); | |
a74e1786 | 278 | ui->call_readline = gdb_readline_no_editing_callback; |
b5a0ac70 | 279 | } |
3c216924 | 280 | ui->command_editing = editing; |
b5a0ac70 SS |
281 | } |
282 | ||
d3d4baed PA |
283 | /* The functions below are wrappers for rl_callback_handler_remove and |
284 | rl_callback_handler_install that keep track of whether the callback | |
285 | handler is installed in readline. This is necessary because after | |
286 | handling a target event of a background execution command, we may | |
287 | need to reinstall the callback handler if it was removed due to a | |
288 | secondary prompt. See gdb_readline_wrapper_line. We don't | |
289 | unconditionally install the handler for every target event because | |
290 | that also clears the line buffer, thus installing it while the user | |
291 | is typing would lose input. */ | |
292 | ||
293 | /* Whether we've registered a callback handler with readline. */ | |
294 | static int callback_handler_installed; | |
295 | ||
296 | /* See event-top.h, and above. */ | |
297 | ||
298 | void | |
299 | gdb_rl_callback_handler_remove (void) | |
300 | { | |
3c216924 PA |
301 | gdb_assert (current_ui == main_ui); |
302 | ||
d3d4baed PA |
303 | rl_callback_handler_remove (); |
304 | callback_handler_installed = 0; | |
305 | } | |
306 | ||
307 | /* See event-top.h, and above. Note this wrapper doesn't have an | |
308 | actual callback parameter because we always install | |
309 | INPUT_HANDLER. */ | |
310 | ||
311 | void | |
312 | gdb_rl_callback_handler_install (const char *prompt) | |
313 | { | |
3c216924 PA |
314 | gdb_assert (current_ui == main_ui); |
315 | ||
d3d4baed PA |
316 | /* Calling rl_callback_handler_install resets readline's input |
317 | buffer. Calling this when we were already processing input | |
318 | therefore loses input. */ | |
319 | gdb_assert (!callback_handler_installed); | |
320 | ||
89525768 | 321 | rl_callback_handler_install (prompt, gdb_rl_callback_handler); |
d3d4baed PA |
322 | callback_handler_installed = 1; |
323 | } | |
324 | ||
325 | /* See event-top.h, and above. */ | |
326 | ||
327 | void | |
328 | gdb_rl_callback_handler_reinstall (void) | |
329 | { | |
3c216924 PA |
330 | gdb_assert (current_ui == main_ui); |
331 | ||
d3d4baed PA |
332 | if (!callback_handler_installed) |
333 | { | |
334 | /* Passing NULL as prompt argument tells readline to not display | |
335 | a prompt. */ | |
336 | gdb_rl_callback_handler_install (NULL); | |
337 | } | |
338 | } | |
339 | ||
ab821bc6 PA |
340 | /* Displays the prompt. If the argument NEW_PROMPT is NULL, the |
341 | prompt that is displayed is the current top level prompt. | |
342 | Otherwise, it displays whatever NEW_PROMPT is as a local/secondary | |
343 | prompt. | |
344 | ||
345 | This is used after each gdb command has completed, and in the | |
346 | following cases: | |
347 | ||
371d5dec | 348 | 1. When the user enters a command line which is ended by '\' |
ab821bc6 PA |
349 | indicating that the command will continue on the next line. In |
350 | that case the prompt that is displayed is the empty string. | |
351 | ||
0f71a2f6 | 352 | 2. When the user is entering 'commands' for a breakpoint, or |
371d5dec | 353 | actions for a tracepoint. In this case the prompt will be '>' |
ab821bc6 PA |
354 | |
355 | 3. On prompting for pagination. */ | |
356 | ||
b5a0ac70 | 357 | void |
38bcc89d | 358 | display_gdb_prompt (const char *new_prompt) |
b5a0ac70 | 359 | { |
606aae8a | 360 | std::string actual_gdb_prompt; |
b5a0ac70 | 361 | |
bd00c694 PA |
362 | annotate_display_prompt (); |
363 | ||
16026cd7 AS |
364 | /* Reset the nesting depth used when trace-commands is set. */ |
365 | reset_command_nest_depth (); | |
366 | ||
ab821bc6 PA |
367 | /* Do not call the python hook on an explicit prompt change as |
368 | passed to this function, as this forms a secondary/local prompt, | |
369 | IE, displayed but not set. */ | |
370 | if (! new_prompt) | |
adf40b2e | 371 | { |
3b12939d PA |
372 | struct ui *ui = current_ui; |
373 | ||
374 | if (ui->prompt_state == PROMPTED) | |
375 | internal_error (__FILE__, __LINE__, _("double prompt")); | |
376 | else if (ui->prompt_state == PROMPT_BLOCKED) | |
d17b6f81 | 377 | { |
ab821bc6 PA |
378 | /* This is to trick readline into not trying to display the |
379 | prompt. Even though we display the prompt using this | |
380 | function, readline still tries to do its own display if | |
381 | we don't call rl_callback_handler_install and | |
382 | rl_callback_handler_remove (which readline detects | |
383 | because a global variable is not set). If readline did | |
384 | that, it could mess up gdb signal handlers for SIGINT. | |
385 | Readline assumes that between calls to rl_set_signals and | |
386 | rl_clear_signals gdb doesn't do anything with the signal | |
387 | handlers. Well, that's not the case, because when the | |
388 | target executes we change the SIGINT signal handler. If | |
389 | we allowed readline to display the prompt, the signal | |
390 | handler change would happen exactly between the calls to | |
391 | the above two functions. Calling | |
392 | rl_callback_handler_remove(), does the job. */ | |
393 | ||
3c216924 PA |
394 | if (current_ui->command_editing) |
395 | gdb_rl_callback_handler_remove (); | |
ab821bc6 | 396 | return; |
d17b6f81 | 397 | } |
3b12939d | 398 | else if (ui->prompt_state == PROMPT_NEEDED) |
ab821bc6 PA |
399 | { |
400 | /* Display the top level prompt. */ | |
401 | actual_gdb_prompt = top_level_prompt (); | |
3b12939d | 402 | ui->prompt_state = PROMPTED; |
ab821bc6 | 403 | } |
b5a0ac70 | 404 | } |
ab821bc6 | 405 | else |
606aae8a | 406 | actual_gdb_prompt = new_prompt; |
b5a0ac70 | 407 | |
3c216924 | 408 | if (current_ui->command_editing) |
b5a0ac70 | 409 | { |
d3d4baed | 410 | gdb_rl_callback_handler_remove (); |
606aae8a | 411 | gdb_rl_callback_handler_install (actual_gdb_prompt.c_str ()); |
b5a0ac70 | 412 | } |
371d5dec | 413 | /* new_prompt at this point can be the top of the stack or the one |
d014929c MS |
414 | passed in. It can't be NULL. */ |
415 | else | |
b5a0ac70 SS |
416 | { |
417 | /* Don't use a _filtered function here. It causes the assumed | |
418 | character position to be off, since the newline we read from | |
419 | the user is not accounted for. */ | |
faa17681 | 420 | fprintf_unfiltered (gdb_stdout, "%s", actual_gdb_prompt.c_str ()); |
b5a0ac70 SS |
421 | gdb_flush (gdb_stdout); |
422 | } | |
423 | } | |
424 | ||
ab821bc6 | 425 | /* Return the top level prompt, as specified by "set prompt", possibly |
405feb71 | 426 | overridden by the python gdb.prompt_hook hook, and then composed |
606aae8a | 427 | with the prompt prefix and suffix (annotations). */ |
ab821bc6 | 428 | |
606aae8a | 429 | static std::string |
ab821bc6 | 430 | top_level_prompt (void) |
b5a0ac70 | 431 | { |
608ff013 | 432 | char *prompt; |
b5a0ac70 | 433 | |
ab821bc6 PA |
434 | /* Give observers a chance of changing the prompt. E.g., the python |
435 | `gdb.prompt_hook' is installed as an observer. */ | |
76727919 | 436 | gdb::observers::before_prompt.notify (get_prompt ()); |
ab821bc6 | 437 | |
608ff013 | 438 | prompt = get_prompt (); |
b5a0ac70 | 439 | |
ab821bc6 | 440 | if (annotation_level >= 2) |
b5a0ac70 | 441 | { |
ab821bc6 | 442 | /* Prefix needs to have new line at end. */ |
608ff013 | 443 | const char prefix[] = "\n\032\032pre-prompt\n"; |
ab821bc6 PA |
444 | |
445 | /* Suffix needs to have a new line at end and \032 \032 at | |
446 | beginning. */ | |
608ff013 | 447 | const char suffix[] = "\n\032\032prompt\n"; |
b5a0ac70 | 448 | |
606aae8a | 449 | return std::string (prefix) + prompt + suffix; |
608ff013 | 450 | } |
ab821bc6 | 451 | |
606aae8a | 452 | return prompt; |
b5a0ac70 | 453 | } |
c2c6d25f | 454 | |
98d9f24e | 455 | /* See top.h. */ |
73ab01a0 | 456 | |
98d9f24e PA |
457 | struct ui *main_ui; |
458 | struct ui *current_ui; | |
459 | struct ui *ui_list; | |
73ab01a0 | 460 | |
a74e1786 | 461 | /* Get a pointer to the current UI's line buffer. This is used to |
b69d38af PA |
462 | construct a whole line of input from partial input. */ |
463 | ||
464 | static struct buffer * | |
465 | get_command_line_buffer (void) | |
466 | { | |
a74e1786 | 467 | return ¤t_ui->line_buffer; |
b69d38af PA |
468 | } |
469 | ||
187212b3 | 470 | /* When there is an event ready on the stdin file descriptor, instead |
c2c6d25f | 471 | of calling readline directly throught the callback function, or |
c70061cf PA |
472 | instead of calling gdb_readline_no_editing_callback, give gdb a |
473 | chance to detect errors and do something. */ | |
474 | ||
c2c6d25f | 475 | void |
2acceee2 | 476 | stdin_event_handler (int error, gdb_client_data client_data) |
c2c6d25f | 477 | { |
41fd2b0f PA |
478 | struct ui *ui = (struct ui *) client_data; |
479 | ||
c2c6d25f JM |
480 | if (error) |
481 | { | |
07169ff7 PA |
482 | /* Switch to the main UI, so diagnostics always go there. */ |
483 | current_ui = main_ui; | |
484 | ||
41fd2b0f | 485 | delete_file_handler (ui->input_fd); |
07169ff7 PA |
486 | if (main_ui == ui) |
487 | { | |
488 | /* If stdin died, we may as well kill gdb. */ | |
489 | printf_unfiltered (_("error detected on stdin\n")); | |
268a799a | 490 | quit_command ((char *) 0, 0); |
07169ff7 PA |
491 | } |
492 | else | |
493 | { | |
494 | /* Simply delete the UI. */ | |
895b8f30 | 495 | delete ui; |
07169ff7 | 496 | } |
c2c6d25f JM |
497 | } |
498 | else | |
d64e57fa | 499 | { |
07169ff7 PA |
500 | /* Switch to the UI whose input descriptor woke up the event |
501 | loop. */ | |
502 | current_ui = ui; | |
503 | ||
504 | /* This makes sure a ^C immediately followed by further input is | |
505 | always processed in that order. E.g,. with input like | |
506 | "^Cprint 1\n", the SIGINT handler runs, marks the async | |
507 | signal handler, and then select/poll may return with stdin | |
508 | ready, instead of -1/EINTR. The | |
509 | gdb.base/double-prompt-target-event-error.exp test exercises | |
510 | this. */ | |
d2acc30b PA |
511 | QUIT; |
512 | ||
d64e57fa PP |
513 | do |
514 | { | |
515 | call_stdin_event_handler_again_p = 0; | |
a74e1786 | 516 | ui->call_readline (client_data); |
07169ff7 PA |
517 | } |
518 | while (call_stdin_event_handler_again_p != 0); | |
d64e57fa | 519 | } |
c2c6d25f JM |
520 | } |
521 | ||
3eb7562a PA |
522 | /* See top.h. */ |
523 | ||
524 | void | |
525 | ui_register_input_event_handler (struct ui *ui) | |
526 | { | |
527 | add_file_handler (ui->input_fd, stdin_event_handler, ui); | |
528 | } | |
529 | ||
530 | /* See top.h. */ | |
531 | ||
532 | void | |
533 | ui_unregister_input_event_handler (struct ui *ui) | |
534 | { | |
535 | delete_file_handler (ui->input_fd); | |
536 | } | |
537 | ||
6426a772 JM |
538 | /* Re-enable stdin after the end of an execution command in |
539 | synchronous mode, or after an error from the target, and we aborted | |
371d5dec | 540 | the exec operation. */ |
6426a772 JM |
541 | |
542 | void | |
712af3be | 543 | async_enable_stdin (void) |
6426a772 | 544 | { |
3b12939d PA |
545 | struct ui *ui = current_ui; |
546 | ||
547 | if (ui->prompt_state == PROMPT_BLOCKED) | |
32c1e744 | 548 | { |
223ffa71 | 549 | target_terminal::ours (); |
3eb7562a | 550 | ui_register_input_event_handler (ui); |
3b12939d | 551 | ui->prompt_state = PROMPT_NEEDED; |
32c1e744 | 552 | } |
6426a772 JM |
553 | } |
554 | ||
555 | /* Disable reads from stdin (the console) marking the command as | |
371d5dec | 556 | synchronous. */ |
6426a772 JM |
557 | |
558 | void | |
559 | async_disable_stdin (void) | |
560 | { | |
3b12939d PA |
561 | struct ui *ui = current_ui; |
562 | ||
563 | ui->prompt_state = PROMPT_BLOCKED; | |
3eb7562a | 564 | delete_file_handler (ui->input_fd); |
6426a772 | 565 | } |
b5a0ac70 | 566 | \f |
6426a772 | 567 | |
b69d38af PA |
568 | /* Handle a gdb command line. This function is called when |
569 | handle_line_of_input has concatenated one or more input lines into | |
570 | a whole command. */ | |
571 | ||
572 | void | |
95a6b0a1 | 573 | command_handler (const char *command) |
b5a0ac70 | 574 | { |
f38d3ad1 | 575 | struct ui *ui = current_ui; |
95a6b0a1 | 576 | const char *c; |
b5a0ac70 | 577 | |
268a799a | 578 | if (ui->instream == ui->stdin_stream) |
b5a0ac70 | 579 | reinitialize_more_filter (); |
b5a0ac70 | 580 | |
1e3b796d | 581 | scoped_command_stats stat_reporter (true); |
b5a0ac70 | 582 | |
b69d38af PA |
583 | /* Do not execute commented lines. */ |
584 | for (c = command; *c == ' ' || *c == '\t'; c++) | |
585 | ; | |
586 | if (c[0] != '#') | |
587 | { | |
268a799a | 588 | execute_command (command, ui->instream == ui->stdin_stream); |
c5aa993b | 589 | |
b69d38af PA |
590 | /* Do any commands attached to breakpoint we stopped at. */ |
591 | bpstat_do_actions (); | |
592 | } | |
43ff13b4 JM |
593 | } |
594 | ||
b69d38af PA |
595 | /* Append RL, an input line returned by readline or one of its |
596 | emulations, to CMD_LINE_BUFFER. Returns the command line if we | |
597 | have a whole command line ready to be processed by the command | |
598 | interpreter or NULL if the command line isn't complete yet (input | |
95bc9f0b | 599 | line ends in a backslash). */ |
b5a0ac70 | 600 | |
b69d38af | 601 | static char * |
95bc9f0b | 602 | command_line_append_input_line (struct buffer *cmd_line_buffer, const char *rl) |
b5a0ac70 | 603 | { |
b69d38af PA |
604 | char *cmd; |
605 | size_t len; | |
b5a0ac70 | 606 | |
b69d38af | 607 | len = strlen (rl); |
b5a0ac70 | 608 | |
b69d38af | 609 | if (len > 0 && rl[len - 1] == '\\') |
b5a0ac70 | 610 | { |
b69d38af PA |
611 | /* Don't copy the backslash and wait for more. */ |
612 | buffer_grow (cmd_line_buffer, rl, len - 1); | |
613 | cmd = NULL; | |
b5a0ac70 | 614 | } |
b69d38af | 615 | else |
b5a0ac70 | 616 | { |
b69d38af PA |
617 | /* Copy whole line including terminating null, and we're |
618 | done. */ | |
619 | buffer_grow (cmd_line_buffer, rl, len + 1); | |
620 | cmd = cmd_line_buffer->buffer; | |
b5a0ac70 SS |
621 | } |
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 | 638 | - If the input command line is NOT empty, the command returned is |
68bb5386 | 639 | saved using save_command_line () so that it can be repeated later. |
d96429cd | 640 | |
68bb5386 PW |
641 | - OTOH, if the input command line IS empty, return the saved |
642 | command instead of the empty input line. | |
b69d38af | 643 | */ |
b5a0ac70 | 644 | |
b69d38af PA |
645 | char * |
646 | handle_line_of_input (struct buffer *cmd_line_buffer, | |
95bc9f0b TT |
647 | const char *rl, int repeat, |
648 | const char *annotation_suffix) | |
b69d38af | 649 | { |
f38d3ad1 | 650 | struct ui *ui = current_ui; |
268a799a | 651 | int from_tty = ui->instream == ui->stdin_stream; |
b69d38af PA |
652 | char *p1; |
653 | char *cmd; | |
654 | ||
655 | if (rl == NULL) | |
656 | return (char *) EOF; | |
657 | ||
658 | cmd = command_line_append_input_line (cmd_line_buffer, rl); | |
659 | if (cmd == NULL) | |
660 | return NULL; | |
b5a0ac70 | 661 | |
b69d38af PA |
662 | /* We have a complete command line now. Prepare for the next |
663 | command, but leave ownership of memory to the buffer . */ | |
664 | cmd_line_buffer->used_size = 0; | |
665 | ||
268a799a | 666 | if (from_tty && annotation_level > 1) |
b5a0ac70 | 667 | { |
b69d38af PA |
668 | printf_unfiltered (("\n\032\032post-")); |
669 | puts_unfiltered (annotation_suffix); | |
670 | printf_unfiltered (("\n")); | |
671 | } | |
672 | ||
673 | #define SERVER_COMMAND_PREFIX "server " | |
9937536c JB |
674 | server_command = startswith (cmd, SERVER_COMMAND_PREFIX); |
675 | if (server_command) | |
b69d38af | 676 | { |
68bb5386 | 677 | /* Note that we don't call `save_command_line'. Between this |
b69d38af PA |
678 | and the check in dont_repeat, this insures that repeating |
679 | will still do the right thing. */ | |
680 | return cmd + strlen (SERVER_COMMAND_PREFIX); | |
b5a0ac70 SS |
681 | } |
682 | ||
683 | /* Do history expansion if that is wished. */ | |
268a799a | 684 | if (history_expansion_p && from_tty && input_interactive_p (current_ui)) |
b5a0ac70 | 685 | { |
b6fb1ee5 | 686 | char *cmd_expansion; |
b5a0ac70 SS |
687 | int expanded; |
688 | ||
b6fb1ee5 PW |
689 | expanded = history_expand (cmd, &cmd_expansion); |
690 | gdb::unique_xmalloc_ptr<char> history_value (cmd_expansion); | |
b5a0ac70 SS |
691 | if (expanded) |
692 | { | |
b69d38af PA |
693 | size_t len; |
694 | ||
b5a0ac70 | 695 | /* Print the changes. */ |
b6fb1ee5 | 696 | printf_unfiltered ("%s\n", history_value.get ()); |
b5a0ac70 SS |
697 | |
698 | /* If there was an error, call this function again. */ | |
699 | if (expanded < 0) | |
b6fb1ee5 | 700 | return cmd; |
b69d38af PA |
701 | |
702 | /* history_expand returns an allocated string. Just replace | |
703 | our buffer with it. */ | |
b6fb1ee5 | 704 | len = strlen (history_value.get ()); |
b69d38af | 705 | xfree (buffer_finish (cmd_line_buffer)); |
b6fb1ee5 | 706 | cmd_line_buffer->buffer = history_value.get (); |
b69d38af | 707 | cmd_line_buffer->buffer_size = len + 1; |
b6fb1ee5 | 708 | cmd = history_value.release (); |
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') | |
68bb5386 | 717 | return get_saved_command_line (); |
b69d38af PA |
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. */ | |
268a799a | 726 | if (*cmd != '\0' && from_tty && input_interactive_p (current_ui)) |
b69d38af | 727 | gdb_add_history (cmd); |
b5a0ac70 | 728 | |
b69d38af PA |
729 | /* Save into global buffer if appropriate. */ |
730 | if (repeat) | |
b5a0ac70 | 731 | { |
68bb5386 PW |
732 | save_command_line (cmd); |
733 | return get_saved_command_line (); | |
b5a0ac70 | 734 | } |
b69d38af PA |
735 | else |
736 | return cmd; | |
737 | } | |
b5a0ac70 | 738 | |
b69d38af PA |
739 | /* Handle a complete line of input. This is called by the callback |
740 | mechanism within the readline library. Deal with incomplete | |
741 | commands as well, by saving the partial input in a global | |
742 | buffer. | |
b5a0ac70 | 743 | |
b69d38af PA |
744 | NOTE: This is the asynchronous version of the command_line_input |
745 | function. */ | |
b5a0ac70 | 746 | |
b69d38af | 747 | void |
95bc9f0b | 748 | command_line_handler (gdb::unique_xmalloc_ptr<char> &&rl) |
b69d38af PA |
749 | { |
750 | struct buffer *line_buffer = get_command_line_buffer (); | |
f38d3ad1 | 751 | struct ui *ui = current_ui; |
b69d38af | 752 | char *cmd; |
b5a0ac70 | 753 | |
95bc9f0b | 754 | cmd = handle_line_of_input (line_buffer, rl.get (), 1, "prompt"); |
b69d38af | 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"); | |
95a6b0a1 | 762 | execute_command ("quit", 1); |
b69d38af PA |
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 | { | |
3b12939d PA |
771 | ui->prompt_state = PROMPT_NEEDED; |
772 | ||
b69d38af | 773 | command_handler (cmd); |
3b12939d PA |
774 | |
775 | if (ui->prompt_state != PROMPTED) | |
776 | display_gdb_prompt (0); | |
b5a0ac70 | 777 | } |
b5a0ac70 SS |
778 | } |
779 | ||
780 | /* Does reading of input from terminal w/o the editing features | |
c70061cf PA |
781 | provided by the readline library. Calls the line input handler |
782 | once we have a whole input line. */ | |
b5a0ac70 | 783 | |
085dd6e6 | 784 | void |
c70061cf | 785 | gdb_readline_no_editing_callback (gdb_client_data client_data) |
b5a0ac70 SS |
786 | { |
787 | int c; | |
788 | char *result; | |
187212b3 | 789 | struct buffer line_buffer; |
7be570e7 | 790 | static int done_once = 0; |
a74e1786 | 791 | struct ui *ui = current_ui; |
7be570e7 | 792 | |
187212b3 PA |
793 | buffer_init (&line_buffer); |
794 | ||
7be570e7 | 795 | /* Unbuffer the input stream, so that, later on, the calls to fgetc |
371d5dec | 796 | fetch only one char at the time from the stream. The fgetc's will |
7be570e7 | 797 | get up to the first newline, but there may be more chars in the |
371d5dec | 798 | stream after '\n'. If we buffer the input and fgetc drains the |
7be570e7 | 799 | stream, getting stuff beyond the newline as well, a select, done |
371d5dec | 800 | afterwards will not trigger. */ |
f38d3ad1 | 801 | if (!done_once && !ISATTY (ui->instream)) |
7be570e7 | 802 | { |
f38d3ad1 | 803 | setbuf (ui->instream, NULL); |
7be570e7 JM |
804 | done_once = 1; |
805 | } | |
b5a0ac70 | 806 | |
b5a0ac70 | 807 | /* We still need the while loop here, even though it would seem |
c70061cf PA |
808 | obvious to invoke gdb_readline_no_editing_callback at every |
809 | character entered. If not using the readline library, the | |
810 | terminal is in cooked mode, which sends the characters all at | |
811 | once. Poll will notice that the input fd has changed state only | |
812 | after enter is pressed. At this point we still need to fetch all | |
813 | the chars entered. */ | |
b5a0ac70 SS |
814 | |
815 | while (1) | |
816 | { | |
817 | /* Read from stdin if we are executing a user defined command. | |
818 | This is the right thing for prompt_for_continue, at least. */ | |
268a799a | 819 | c = fgetc (ui->instream != NULL ? ui->instream : ui->stdin_stream); |
b5a0ac70 SS |
820 | |
821 | if (c == EOF) | |
822 | { | |
187212b3 PA |
823 | if (line_buffer.used_size > 0) |
824 | { | |
825 | /* The last line does not end with a newline. Return it, and | |
826 | if we are called again fgetc will still return EOF and | |
827 | we'll return NULL then. */ | |
828 | break; | |
829 | } | |
830 | xfree (buffer_finish (&line_buffer)); | |
a74e1786 | 831 | ui->input_handler (NULL); |
13ce7133 | 832 | return; |
b5a0ac70 SS |
833 | } |
834 | ||
835 | if (c == '\n') | |
b5a0ac70 | 836 | { |
187212b3 PA |
837 | if (line_buffer.used_size > 0 |
838 | && line_buffer.buffer[line_buffer.used_size - 1] == '\r') | |
839 | line_buffer.used_size--; | |
b5a0ac70 SS |
840 | break; |
841 | } | |
b5a0ac70 | 842 | |
187212b3 | 843 | buffer_grow_char (&line_buffer, c); |
b5a0ac70 SS |
844 | } |
845 | ||
187212b3 PA |
846 | buffer_grow_char (&line_buffer, '\0'); |
847 | result = buffer_finish (&line_buffer); | |
95bc9f0b | 848 | ui->input_handler (gdb::unique_xmalloc_ptr<char> (result)); |
b5a0ac70 SS |
849 | } |
850 | \f | |
851 | ||
3b3978bc TT |
852 | /* See event-top.h. */ |
853 | ||
854 | thread_local void (*thread_local_segv_handler) (int); | |
855 | ||
856 | static void handle_sigsegv (int sig); | |
857 | ||
858 | /* Install the SIGSEGV handler. */ | |
859 | static void | |
860 | install_handle_sigsegv () | |
861 | { | |
862 | #if defined (HAVE_SIGACTION) | |
863 | struct sigaction sa; | |
864 | sa.sa_handler = handle_sigsegv; | |
865 | sigemptyset (&sa.sa_mask); | |
866 | #ifdef HAVE_SIGALTSTACK | |
867 | sa.sa_flags = SA_ONSTACK; | |
868 | #else | |
869 | sa.sa_flags = 0; | |
870 | #endif | |
871 | sigaction (SIGSEGV, &sa, nullptr); | |
872 | #else | |
873 | signal (SIGSEGV, handle_sigsegv); | |
874 | #endif | |
875 | } | |
876 | ||
877 | /* Handler for SIGSEGV. */ | |
878 | ||
879 | static void | |
880 | handle_sigsegv (int sig) | |
881 | { | |
882 | install_handle_sigsegv (); | |
883 | ||
884 | if (thread_local_segv_handler == nullptr) | |
036003a6 | 885 | abort (); /* ARI: abort */ |
3b3978bc TT |
886 | thread_local_segv_handler (sig); |
887 | } | |
888 | ||
889 | \f | |
890 | ||
f0881b37 PA |
891 | /* The serial event associated with the QUIT flag. set_quit_flag sets |
892 | this, and check_quit_flag clears it. Used by interruptible_select | |
893 | to be able to do interruptible I/O with no race with the SIGINT | |
894 | handler. */ | |
895 | static struct serial_event *quit_serial_event; | |
896 | ||
b5a0ac70 | 897 | /* Initialization of signal handlers and tokens. There is a function |
371d5dec | 898 | handle_sig* for each of the signals GDB cares about. Specifically: |
b5a0ac70 SS |
899 | SIGINT, SIGFPE, SIGQUIT, SIGTSTP, SIGHUP, SIGWINCH. These |
900 | functions are the actual signal handlers associated to the signals | |
901 | via calls to signal(). The only job for these functions is to | |
902 | enqueue the appropriate event/procedure with the event loop. Such | |
371d5dec | 903 | procedures are the old signal handlers. The event loop will take |
b5a0ac70 | 904 | care of invoking the queued procedures to perform the usual tasks |
371d5dec | 905 | associated with the reception of the signal. */ |
392a587b | 906 | /* NOTE: 1999-04-30 This is the asynchronous version of init_signals. |
b5a0ac70 | 907 | init_signals will become obsolete as we move to have to event loop |
371d5dec | 908 | as the default for gdb. */ |
b5a0ac70 | 909 | void |
c2c6d25f | 910 | async_init_signals (void) |
c5aa993b | 911 | { |
5cc3ce8b PA |
912 | initialize_async_signal_handlers (); |
913 | ||
f0881b37 PA |
914 | quit_serial_event = make_serial_event (); |
915 | ||
b5a0ac70 SS |
916 | signal (SIGINT, handle_sigint); |
917 | sigint_token = | |
0f71a2f6 | 918 | create_async_signal_handler (async_request_quit, NULL); |
a7266fef | 919 | signal (SIGTERM, handle_sigterm); |
06c868a8 JK |
920 | async_sigterm_token |
921 | = create_async_signal_handler (async_sigterm_handler, NULL); | |
b5a0ac70 SS |
922 | |
923 | /* If SIGTRAP was set to SIG_IGN, then the SIG_IGN will get passed | |
924 | to the inferior and breakpoints will be ignored. */ | |
925 | #ifdef SIGTRAP | |
926 | signal (SIGTRAP, SIG_DFL); | |
927 | #endif | |
928 | ||
6d318c73 | 929 | #ifdef SIGQUIT |
b5a0ac70 SS |
930 | /* If we initialize SIGQUIT to SIG_IGN, then the SIG_IGN will get |
931 | passed to the inferior, which we don't want. It would be | |
932 | possible to do a "signal (SIGQUIT, SIG_DFL)" after we fork, but | |
933 | on BSD4.3 systems using vfork, that can affect the | |
934 | GDB process as well as the inferior (the signal handling tables | |
935 | might be in memory, shared between the two). Since we establish | |
936 | a handler for SIGQUIT, when we call exec it will set the signal | |
937 | to SIG_DFL for us. */ | |
938 | signal (SIGQUIT, handle_sigquit); | |
939 | sigquit_token = | |
0f71a2f6 | 940 | create_async_signal_handler (async_do_nothing, NULL); |
6d318c73 | 941 | #endif |
b5a0ac70 SS |
942 | #ifdef SIGHUP |
943 | if (signal (SIGHUP, handle_sighup) != SIG_IGN) | |
944 | sighup_token = | |
0f71a2f6 | 945 | create_async_signal_handler (async_disconnect, NULL); |
b5a0ac70 SS |
946 | else |
947 | sighup_token = | |
0f71a2f6 | 948 | create_async_signal_handler (async_do_nothing, NULL); |
b5a0ac70 SS |
949 | #endif |
950 | signal (SIGFPE, handle_sigfpe); | |
951 | sigfpe_token = | |
0f71a2f6 | 952 | create_async_signal_handler (async_float_handler, NULL); |
b5a0ac70 | 953 | |
6aa899ce | 954 | #ifdef SIGTSTP |
0f71a2f6 | 955 | sigtstp_token = |
6aa899ce | 956 | create_async_signal_handler (async_sigtstp_handler, NULL); |
0f71a2f6 | 957 | #endif |
3b3978bc TT |
958 | |
959 | install_handle_sigsegv (); | |
0f71a2f6 JM |
960 | } |
961 | ||
f0881b37 PA |
962 | /* See defs.h. */ |
963 | ||
964 | void | |
965 | quit_serial_event_set (void) | |
966 | { | |
967 | serial_event_set (quit_serial_event); | |
968 | } | |
969 | ||
970 | /* See defs.h. */ | |
971 | ||
972 | void | |
973 | quit_serial_event_clear (void) | |
974 | { | |
975 | serial_event_clear (quit_serial_event); | |
976 | } | |
977 | ||
978 | /* Return the selectable file descriptor of the serial event | |
979 | associated with the quit flag. */ | |
980 | ||
981 | static int | |
982 | quit_serial_event_fd (void) | |
983 | { | |
984 | return serial_event_fd (quit_serial_event); | |
985 | } | |
986 | ||
048094ac PA |
987 | /* See defs.h. */ |
988 | ||
989 | void | |
990 | default_quit_handler (void) | |
991 | { | |
992 | if (check_quit_flag ()) | |
993 | { | |
223ffa71 | 994 | if (target_terminal::is_ours ()) |
048094ac PA |
995 | quit (); |
996 | else | |
997 | target_pass_ctrlc (); | |
998 | } | |
999 | } | |
1000 | ||
1001 | /* See defs.h. */ | |
1002 | quit_handler_ftype *quit_handler = default_quit_handler; | |
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 | { | |
268a799a | 1063 | quit_force (NULL, 0); |
06c868a8 JK |
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 | |
a70b8144 | 1129 | try |
b2cd6b29 JM |
1130 | { |
1131 | quit_cover (); | |
1132 | } | |
1133 | ||
230d2906 | 1134 | catch (const gdb_exception &exception) |
b2cd6b29 JM |
1135 | { |
1136 | fputs_filtered ("Could not kill the program being debugged", | |
1137 | gdb_stderr); | |
1138 | exception_print (gdb_stderr, exception); | |
1139 | } | |
1140 | ||
5b6d1e4f | 1141 | for (inferior *inf : all_inferiors ()) |
492d29ea | 1142 | { |
5b6d1e4f PA |
1143 | switch_to_inferior_no_thread (inf); |
1144 | try | |
1145 | { | |
1146 | pop_all_targets (); | |
1147 | } | |
1148 | catch (const gdb_exception &exception) | |
1149 | { | |
1150 | } | |
492d29ea | 1151 | } |
b2cd6b29 | 1152 | |
371d5dec | 1153 | signal (SIGHUP, SIG_DFL); /*FIXME: ??????????? */ |
ec4dfccf | 1154 | raise (SIGHUP); |
b5a0ac70 SS |
1155 | } |
1156 | #endif | |
1157 | ||
6aa899ce | 1158 | #ifdef SIGTSTP |
c5aa993b | 1159 | void |
6aa899ce | 1160 | handle_sigtstp (int sig) |
0f71a2f6 | 1161 | { |
f6fbab7d | 1162 | mark_async_signal_handler (sigtstp_token); |
6aa899ce | 1163 | signal (sig, handle_sigtstp); |
0f71a2f6 JM |
1164 | } |
1165 | ||
1166 | static void | |
6aa899ce | 1167 | async_sigtstp_handler (gdb_client_data arg) |
0f71a2f6 | 1168 | { |
ab821bc6 | 1169 | char *prompt = get_prompt (); |
d7f9d729 | 1170 | |
0f71a2f6 | 1171 | signal (SIGTSTP, SIG_DFL); |
2acceee2 JM |
1172 | #if HAVE_SIGPROCMASK |
1173 | { | |
1174 | sigset_t zero; | |
46711df8 | 1175 | |
2acceee2 | 1176 | sigemptyset (&zero); |
21987b9c | 1177 | gdb_sigmask (SIG_SETMASK, &zero, 0); |
2acceee2 | 1178 | } |
46711df8 | 1179 | #elif HAVE_SIGSETMASK |
0f71a2f6 | 1180 | sigsetmask (0); |
2acceee2 | 1181 | #endif |
ec4dfccf | 1182 | raise (SIGTSTP); |
6aa899ce | 1183 | signal (SIGTSTP, handle_sigtstp); |
0f71a2f6 JM |
1184 | printf_unfiltered ("%s", prompt); |
1185 | gdb_flush (gdb_stdout); | |
1186 | ||
371d5dec MS |
1187 | /* Forget about any previous command -- null line now will do |
1188 | nothing. */ | |
0f71a2f6 JM |
1189 | dont_repeat (); |
1190 | } | |
6aa899ce | 1191 | #endif /* SIGTSTP */ |
0f71a2f6 | 1192 | |
371d5dec MS |
1193 | /* Tell the event loop what to do if SIGFPE is received. |
1194 | See event-signal.c. */ | |
c5aa993b | 1195 | static void |
c2c6d25f | 1196 | handle_sigfpe (int sig) |
b5a0ac70 | 1197 | { |
f6fbab7d | 1198 | mark_async_signal_handler (sigfpe_token); |
b5a0ac70 SS |
1199 | signal (sig, handle_sigfpe); |
1200 | } | |
1201 | ||
405feb71 | 1202 | /* Event loop will call this function to process a SIGFPE. */ |
c5aa993b | 1203 | static void |
c2c6d25f | 1204 | async_float_handler (gdb_client_data arg) |
b5a0ac70 | 1205 | { |
371d5dec MS |
1206 | /* This message is based on ANSI C, section 4.7. Note that integer |
1207 | divide by zero causes this, so "float" is a misnomer. */ | |
8a3fe4f8 | 1208 | error (_("Erroneous arithmetic operation.")); |
b5a0ac70 | 1209 | } |
b5a0ac70 SS |
1210 | \f |
1211 | ||
0f71a2f6 | 1212 | /* Set things up for readline to be invoked via the alternate |
3c610247 PA |
1213 | interface, i.e. via a callback function |
1214 | (gdb_rl_callback_read_char), and hook up instream to the event | |
1215 | loop. */ | |
1216 | ||
0f71a2f6 | 1217 | void |
3c216924 | 1218 | gdb_setup_readline (int editing) |
0f71a2f6 | 1219 | { |
a74e1786 PA |
1220 | struct ui *ui = current_ui; |
1221 | ||
362646f5 AC |
1222 | /* This function is a noop for the sync case. The assumption is |
1223 | that the sync setup is ALL done in gdb_init, and we would only | |
1224 | mess it up here. The sync stuff should really go away over | |
1225 | time. */ | |
1a088d06 | 1226 | if (!batch_silent) |
d7e74731 PA |
1227 | gdb_stdout = new stdio_file (ui->outstream); |
1228 | gdb_stderr = new stderr_file (ui->errstream); | |
362646f5 AC |
1229 | gdb_stdlog = gdb_stderr; /* for moment */ |
1230 | gdb_stdtarg = gdb_stderr; /* for moment */ | |
8d4d924b | 1231 | gdb_stdtargerr = gdb_stderr; /* for moment */ |
362646f5 | 1232 | |
3c216924 PA |
1233 | /* If the input stream is connected to a terminal, turn on editing. |
1234 | However, that is only allowed on the main UI, as we can only have | |
1235 | one instance of readline. */ | |
1236 | if (ISATTY (ui->instream) && editing && ui == main_ui) | |
9e0b60a8 | 1237 | { |
371d5dec | 1238 | /* Tell gdb that we will be using the readline library. This |
362646f5 AC |
1239 | could be overwritten by a command in .gdbinit like 'set |
1240 | editing on' or 'off'. */ | |
3c216924 PA |
1241 | ui->command_editing = 1; |
1242 | ||
362646f5 AC |
1243 | /* When a character is detected on instream by select or poll, |
1244 | readline will be invoked via this callback function. */ | |
a74e1786 | 1245 | ui->call_readline = gdb_rl_callback_read_char_wrapper; |
3c216924 PA |
1246 | |
1247 | /* Tell readline to use the same input stream that gdb uses. */ | |
1248 | rl_instream = ui->instream; | |
9e0b60a8 | 1249 | } |
362646f5 AC |
1250 | else |
1251 | { | |
3c216924 | 1252 | ui->command_editing = 0; |
a74e1786 | 1253 | ui->call_readline = gdb_readline_no_editing_callback; |
362646f5 | 1254 | } |
362646f5 | 1255 | |
41fd2b0f PA |
1256 | /* Now create the event source for this UI's input file descriptor. |
1257 | Another source is going to be the target program (inferior), but | |
1258 | that must be registered only when it actually exists (I.e. after | |
1259 | we say 'run' or after we connect to a remote target. */ | |
3eb7562a | 1260 | ui_register_input_event_handler (ui); |
0f71a2f6 | 1261 | } |
cee6ddeb | 1262 | |
7d5b6fdd EZ |
1263 | /* Disable command input through the standard CLI channels. Used in |
1264 | the suspend proc for interpreters that use the standard gdb readline | |
1265 | interface, like the cli & the mi. */ | |
3c216924 | 1266 | |
7d5b6fdd EZ |
1267 | void |
1268 | gdb_disable_readline (void) | |
1269 | { | |
41fd2b0f PA |
1270 | struct ui *ui = current_ui; |
1271 | ||
362646f5 AC |
1272 | /* FIXME - It is too heavyweight to delete and remake these every |
1273 | time you run an interpreter that needs readline. It is probably | |
1274 | better to have the interpreters cache these, which in turn means | |
1275 | that this needs to be moved into interpreter specific code. */ | |
7d5b6fdd EZ |
1276 | |
1277 | #if 0 | |
362646f5 AC |
1278 | ui_file_delete (gdb_stdout); |
1279 | ui_file_delete (gdb_stderr); | |
1280 | gdb_stdlog = NULL; | |
1281 | gdb_stdtarg = NULL; | |
8d4d924b | 1282 | gdb_stdtargerr = NULL; |
7d5b6fdd EZ |
1283 | #endif |
1284 | ||
3c216924 PA |
1285 | if (ui->command_editing) |
1286 | gdb_rl_callback_handler_remove (); | |
41fd2b0f | 1287 | delete_file_handler (ui->input_fd); |
7d5b6fdd | 1288 | } |