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 | ||
ab821bc6 | 51 | static char *top_level_prompt (void); |
b5a0ac70 | 52 | |
371d5dec | 53 | /* Signal handlers. */ |
6d318c73 | 54 | #ifdef SIGQUIT |
c2c6d25f | 55 | static void handle_sigquit (int sig); |
6d318c73 | 56 | #endif |
0f0b8dcd | 57 | #ifdef SIGHUP |
c2c6d25f | 58 | static void handle_sighup (int sig); |
0f0b8dcd | 59 | #endif |
c2c6d25f | 60 | static void handle_sigfpe (int sig); |
b5a0ac70 SS |
61 | |
62 | /* Functions to be invoked by the event loop in response to | |
371d5dec | 63 | signals. */ |
0f0b8dcd | 64 | #if defined (SIGQUIT) || defined (SIGHUP) |
c2c6d25f | 65 | static void async_do_nothing (gdb_client_data); |
0f0b8dcd DJ |
66 | #endif |
67 | #ifdef SIGHUP | |
c2c6d25f | 68 | static void async_disconnect (gdb_client_data); |
0f0b8dcd | 69 | #endif |
c2c6d25f | 70 | static void async_float_handler (gdb_client_data); |
0f0b8dcd | 71 | #ifdef STOP_SIGNAL |
c2c6d25f | 72 | static void async_stop_sig (gdb_client_data); |
0f0b8dcd | 73 | #endif |
06c868a8 | 74 | static void async_sigterm_handler (gdb_client_data arg); |
b5a0ac70 | 75 | |
a74e1786 PA |
76 | /* Instead of invoking (and waiting for) readline to read the command |
77 | line and pass it back for processing, we use readline's alternate | |
78 | interface, via callback functions, so that the event loop can react | |
79 | to other event sources while we wait for input. */ | |
b5a0ac70 | 80 | |
371d5dec | 81 | /* Important variables for the event loop. */ |
b5a0ac70 SS |
82 | |
83 | /* This is used to determine if GDB is using the readline library or | |
371d5dec | 84 | its own simplified form of readline. It is used by the asynchronous |
0f71a2f6 | 85 | form of the set editing command. |
392a587b | 86 | ezannoni: as of 1999-04-29 I expect that this |
b5a0ac70 | 87 | variable will not be used after gdb is changed to use the event |
371d5dec | 88 | loop as default engine, and event-top.c is merged into top.c. */ |
3c216924 | 89 | int set_editing_cmd_var; |
b5a0ac70 | 90 | |
104c1213 | 91 | /* This is used to display the notification of the completion of an |
371d5dec | 92 | asynchronous execution command. */ |
104c1213 JM |
93 | int exec_done_display_p = 0; |
94 | ||
d64e57fa PP |
95 | /* Used by the stdin event handler to compensate for missed stdin events. |
96 | Setting this to a non-zero value inside an stdin callback makes the callback | |
97 | run again. */ | |
98 | int call_stdin_event_handler_again_p; | |
99 | ||
371d5dec | 100 | /* Signal handling variables. */ |
b5a0ac70 | 101 | /* Each of these is a pointer to a function that the event loop will |
371d5dec | 102 | invoke if the corresponding signal has received. The real signal |
b5a0ac70 | 103 | handlers mark these functions as ready to be executed and the event |
371d5dec MS |
104 | loop, in a later iteration, calls them. See the function |
105 | invoke_async_signal_handler. */ | |
05fa9251 | 106 | static struct async_signal_handler *sigint_token; |
b5a0ac70 | 107 | #ifdef SIGHUP |
05fa9251 | 108 | static struct async_signal_handler *sighup_token; |
b5a0ac70 | 109 | #endif |
6d318c73 | 110 | #ifdef SIGQUIT |
05fa9251 | 111 | static struct async_signal_handler *sigquit_token; |
6d318c73 | 112 | #endif |
05fa9251 | 113 | static struct async_signal_handler *sigfpe_token; |
0f71a2f6 | 114 | #ifdef STOP_SIGNAL |
05fa9251 | 115 | static struct async_signal_handler *sigtstp_token; |
0f71a2f6 | 116 | #endif |
06c868a8 | 117 | static struct async_signal_handler *async_sigterm_token; |
0f71a2f6 | 118 | |
3c610247 | 119 | /* This hook is called by gdb_rl_callback_read_char_wrapper after each |
467d8519 | 120 | character is processed. */ |
b08ee6a2 | 121 | void (*after_char_processing_hook) (void); |
b5a0ac70 SS |
122 | \f |
123 | ||
89525768 PA |
124 | /* Wrapper function for calling into the readline library. This takes |
125 | care of a couple things: | |
126 | ||
127 | - The event loop expects the callback function to have a parameter, | |
128 | while readline expects none. | |
129 | ||
130 | - Propagation of GDB exceptions/errors thrown from INPUT_HANDLER | |
131 | across readline requires special handling. | |
132 | ||
133 | On the exceptions issue: | |
134 | ||
135 | DWARF-based unwinding cannot cross code built without -fexceptions. | |
136 | Any exception that tries to propagate through such code will fail | |
137 | and the result is a call to std::terminate. While some ABIs, such | |
138 | as x86-64, require all code to be built with exception tables, | |
139 | others don't. | |
140 | ||
141 | This is a problem when GDB calls some non-EH-aware C library code, | |
142 | that calls into GDB again through a callback, and that GDB callback | |
143 | code throws a C++ exception. Turns out this is exactly what | |
144 | happens with GDB's readline callback. | |
145 | ||
146 | In such cases, we must catch and save any C++ exception that might | |
147 | be thrown from the GDB callback before returning to the | |
148 | non-EH-aware code. When the non-EH-aware function itself returns | |
149 | back to GDB, we then rethrow the original C++ exception. | |
150 | ||
151 | In the readline case however, the right thing to do is to longjmp | |
152 | out of the callback, rather than do a normal return -- there's no | |
153 | way for the callback to return to readline an indication that an | |
154 | error happened, so a normal return would have rl_callback_read_char | |
155 | potentially continue processing further input, redisplay the | |
156 | prompt, etc. Instead of raw setjmp/longjmp however, we use our | |
157 | sjlj-based TRY/CATCH mechanism, which knows to handle multiple | |
158 | levels of active setjmp/longjmp frames, needed in order to handle | |
159 | the readline callback recursing, as happens with e.g., secondary | |
160 | prompts / queries, through gdb_readline_wrapper. */ | |
161 | ||
c2c6d25f | 162 | static void |
3c610247 | 163 | gdb_rl_callback_read_char_wrapper (gdb_client_data client_data) |
c2c6d25f | 164 | { |
89525768 PA |
165 | struct gdb_exception gdb_expt = exception_none; |
166 | ||
167 | /* C++ exceptions can't normally be thrown across readline (unless | |
168 | it is built with -fexceptions, but it won't by default on many | |
169 | ABIs). So we instead wrap the readline call with a sjlj-based | |
170 | TRY/CATCH, and rethrow the GDB exception once back in GDB. */ | |
171 | TRY_SJLJ | |
172 | { | |
173 | rl_callback_read_char (); | |
174 | if (after_char_processing_hook) | |
175 | (*after_char_processing_hook) (); | |
176 | } | |
177 | CATCH_SJLJ (ex, RETURN_MASK_ALL) | |
178 | { | |
179 | gdb_expt = ex; | |
180 | } | |
181 | END_CATCH_SJLJ | |
182 | ||
183 | /* Rethrow using the normal EH mechanism. */ | |
184 | if (gdb_expt.reason < 0) | |
185 | throw_exception (gdb_expt); | |
186 | } | |
187 | ||
188 | /* GDB's readline callback handler. Calls the current INPUT_HANDLER, | |
189 | and propagates GDB exceptions/errors thrown from INPUT_HANDLER back | |
190 | across readline. See gdb_rl_callback_read_char_wrapper. */ | |
191 | ||
192 | static void | |
193 | gdb_rl_callback_handler (char *rl) | |
194 | { | |
195 | struct gdb_exception gdb_rl_expt = exception_none; | |
a74e1786 | 196 | struct ui *ui = current_ui; |
89525768 PA |
197 | |
198 | TRY | |
199 | { | |
a74e1786 | 200 | ui->input_handler (rl); |
89525768 PA |
201 | } |
202 | CATCH (ex, RETURN_MASK_ALL) | |
203 | { | |
204 | gdb_rl_expt = ex; | |
205 | } | |
206 | END_CATCH | |
207 | ||
208 | /* If we caught a GDB exception, longjmp out of the readline | |
209 | callback. There's no other way for the callback to signal to | |
210 | readline that an error happened. A normal return would have | |
211 | readline potentially continue processing further input, redisplay | |
212 | the prompt, etc. (This is what GDB historically did when it was | |
213 | a C program.) Note that since we're long jumping, local variable | |
214 | dtors are NOT run automatically. */ | |
215 | if (gdb_rl_expt.reason < 0) | |
216 | throw_exception_sjlj (gdb_rl_expt); | |
c2c6d25f JM |
217 | } |
218 | ||
b5a0ac70 | 219 | /* Change the function to be invoked every time there is a character |
371d5dec | 220 | ready on stdin. This is used when the user sets the editing off, |
b5a0ac70 | 221 | therefore bypassing readline, and letting gdb handle the input |
c70061cf PA |
222 | itself, via gdb_readline_no_editing_callback. Also it is used in |
223 | the opposite case in which the user sets editing on again, by | |
3c216924 PA |
224 | restoring readline handling of the input. |
225 | ||
226 | NOTE: this operates on input_fd, not instream. If we are reading | |
227 | commands from a file, instream will point to the file. However, we | |
228 | always read commands from a file with editing off. This means that | |
229 | the 'set editing on/off' will have effect only on the interactive | |
230 | session. */ | |
231 | ||
232 | void | |
233 | change_line_handler (int editing) | |
b5a0ac70 | 234 | { |
a74e1786 PA |
235 | struct ui *ui = current_ui; |
236 | ||
3c216924 PA |
237 | /* We can only have one instance of readline, so we only allow |
238 | editing on the main UI. */ | |
239 | if (ui != main_ui) | |
240 | return; | |
241 | ||
242 | /* Don't try enabling editing if the interpreter doesn't support it | |
243 | (e.g., MI). */ | |
244 | if (!interp_supports_command_editing (top_level_interpreter ()) | |
245 | || !interp_supports_command_editing (command_interp ())) | |
246 | return; | |
c2c6d25f | 247 | |
3c216924 | 248 | if (editing) |
b5a0ac70 | 249 | { |
3c216924 PA |
250 | gdb_assert (ui == main_ui); |
251 | ||
371d5dec | 252 | /* Turn on editing by using readline. */ |
a74e1786 | 253 | ui->call_readline = gdb_rl_callback_read_char_wrapper; |
b5a0ac70 SS |
254 | } |
255 | else | |
256 | { | |
c70061cf | 257 | /* Turn off editing by using gdb_readline_no_editing_callback. */ |
3c216924 PA |
258 | if (ui->command_editing) |
259 | gdb_rl_callback_handler_remove (); | |
a74e1786 | 260 | ui->call_readline = gdb_readline_no_editing_callback; |
b5a0ac70 | 261 | } |
3c216924 | 262 | ui->command_editing = editing; |
b5a0ac70 SS |
263 | } |
264 | ||
d3d4baed PA |
265 | /* The functions below are wrappers for rl_callback_handler_remove and |
266 | rl_callback_handler_install that keep track of whether the callback | |
267 | handler is installed in readline. This is necessary because after | |
268 | handling a target event of a background execution command, we may | |
269 | need to reinstall the callback handler if it was removed due to a | |
270 | secondary prompt. See gdb_readline_wrapper_line. We don't | |
271 | unconditionally install the handler for every target event because | |
272 | that also clears the line buffer, thus installing it while the user | |
273 | is typing would lose input. */ | |
274 | ||
275 | /* Whether we've registered a callback handler with readline. */ | |
276 | static int callback_handler_installed; | |
277 | ||
278 | /* See event-top.h, and above. */ | |
279 | ||
280 | void | |
281 | gdb_rl_callback_handler_remove (void) | |
282 | { | |
3c216924 PA |
283 | gdb_assert (current_ui == main_ui); |
284 | ||
d3d4baed PA |
285 | rl_callback_handler_remove (); |
286 | callback_handler_installed = 0; | |
287 | } | |
288 | ||
289 | /* See event-top.h, and above. Note this wrapper doesn't have an | |
290 | actual callback parameter because we always install | |
291 | INPUT_HANDLER. */ | |
292 | ||
293 | void | |
294 | gdb_rl_callback_handler_install (const char *prompt) | |
295 | { | |
3c216924 PA |
296 | gdb_assert (current_ui == main_ui); |
297 | ||
d3d4baed PA |
298 | /* Calling rl_callback_handler_install resets readline's input |
299 | buffer. Calling this when we were already processing input | |
300 | therefore loses input. */ | |
301 | gdb_assert (!callback_handler_installed); | |
302 | ||
89525768 | 303 | rl_callback_handler_install (prompt, gdb_rl_callback_handler); |
d3d4baed PA |
304 | callback_handler_installed = 1; |
305 | } | |
306 | ||
307 | /* See event-top.h, and above. */ | |
308 | ||
309 | void | |
310 | gdb_rl_callback_handler_reinstall (void) | |
311 | { | |
3c216924 PA |
312 | gdb_assert (current_ui == main_ui); |
313 | ||
d3d4baed PA |
314 | if (!callback_handler_installed) |
315 | { | |
316 | /* Passing NULL as prompt argument tells readline to not display | |
317 | a prompt. */ | |
318 | gdb_rl_callback_handler_install (NULL); | |
319 | } | |
320 | } | |
321 | ||
ab821bc6 PA |
322 | /* Displays the prompt. If the argument NEW_PROMPT is NULL, the |
323 | prompt that is displayed is the current top level prompt. | |
324 | Otherwise, it displays whatever NEW_PROMPT is as a local/secondary | |
325 | prompt. | |
326 | ||
327 | This is used after each gdb command has completed, and in the | |
328 | following cases: | |
329 | ||
371d5dec | 330 | 1. When the user enters a command line which is ended by '\' |
ab821bc6 PA |
331 | indicating that the command will continue on the next line. In |
332 | that case the prompt that is displayed is the empty string. | |
333 | ||
0f71a2f6 | 334 | 2. When the user is entering 'commands' for a breakpoint, or |
371d5dec | 335 | actions for a tracepoint. In this case the prompt will be '>' |
ab821bc6 PA |
336 | |
337 | 3. On prompting for pagination. */ | |
338 | ||
b5a0ac70 | 339 | void |
38bcc89d | 340 | display_gdb_prompt (const char *new_prompt) |
b5a0ac70 | 341 | { |
d17b6f81 | 342 | char *actual_gdb_prompt = NULL; |
ab821bc6 | 343 | struct cleanup *old_chain; |
b5a0ac70 | 344 | |
bd00c694 PA |
345 | annotate_display_prompt (); |
346 | ||
16026cd7 AS |
347 | /* Reset the nesting depth used when trace-commands is set. */ |
348 | reset_command_nest_depth (); | |
349 | ||
ab821bc6 | 350 | old_chain = make_cleanup (free_current_contents, &actual_gdb_prompt); |
d17b6f81 | 351 | |
ab821bc6 PA |
352 | /* Do not call the python hook on an explicit prompt change as |
353 | passed to this function, as this forms a secondary/local prompt, | |
354 | IE, displayed but not set. */ | |
355 | if (! new_prompt) | |
adf40b2e | 356 | { |
3b12939d PA |
357 | struct ui *ui = current_ui; |
358 | ||
359 | if (ui->prompt_state == PROMPTED) | |
360 | internal_error (__FILE__, __LINE__, _("double prompt")); | |
361 | else if (ui->prompt_state == PROMPT_BLOCKED) | |
d17b6f81 | 362 | { |
ab821bc6 PA |
363 | /* This is to trick readline into not trying to display the |
364 | prompt. Even though we display the prompt using this | |
365 | function, readline still tries to do its own display if | |
366 | we don't call rl_callback_handler_install and | |
367 | rl_callback_handler_remove (which readline detects | |
368 | because a global variable is not set). If readline did | |
369 | that, it could mess up gdb signal handlers for SIGINT. | |
370 | Readline assumes that between calls to rl_set_signals and | |
371 | rl_clear_signals gdb doesn't do anything with the signal | |
372 | handlers. Well, that's not the case, because when the | |
373 | target executes we change the SIGINT signal handler. If | |
374 | we allowed readline to display the prompt, the signal | |
375 | handler change would happen exactly between the calls to | |
376 | the above two functions. Calling | |
377 | rl_callback_handler_remove(), does the job. */ | |
378 | ||
3c216924 PA |
379 | if (current_ui->command_editing) |
380 | gdb_rl_callback_handler_remove (); | |
faab9922 | 381 | do_cleanups (old_chain); |
ab821bc6 | 382 | return; |
d17b6f81 | 383 | } |
3b12939d | 384 | else if (ui->prompt_state == PROMPT_NEEDED) |
ab821bc6 PA |
385 | { |
386 | /* Display the top level prompt. */ | |
387 | actual_gdb_prompt = top_level_prompt (); | |
3b12939d | 388 | ui->prompt_state = PROMPTED; |
ab821bc6 | 389 | } |
b5a0ac70 | 390 | } |
ab821bc6 PA |
391 | else |
392 | actual_gdb_prompt = xstrdup (new_prompt); | |
b5a0ac70 | 393 | |
3c216924 | 394 | if (current_ui->command_editing) |
b5a0ac70 | 395 | { |
d3d4baed PA |
396 | gdb_rl_callback_handler_remove (); |
397 | gdb_rl_callback_handler_install (actual_gdb_prompt); | |
b5a0ac70 | 398 | } |
371d5dec | 399 | /* new_prompt at this point can be the top of the stack or the one |
d014929c MS |
400 | passed in. It can't be NULL. */ |
401 | else | |
b5a0ac70 SS |
402 | { |
403 | /* Don't use a _filtered function here. It causes the assumed | |
404 | character position to be off, since the newline we read from | |
405 | the user is not accounted for. */ | |
d17b6f81 | 406 | fputs_unfiltered (actual_gdb_prompt, gdb_stdout); |
b5a0ac70 SS |
407 | gdb_flush (gdb_stdout); |
408 | } | |
ab821bc6 PA |
409 | |
410 | do_cleanups (old_chain); | |
b5a0ac70 SS |
411 | } |
412 | ||
ab821bc6 PA |
413 | /* Return the top level prompt, as specified by "set prompt", possibly |
414 | overriden by the python gdb.prompt_hook hook, and then composed | |
415 | with the prompt prefix and suffix (annotations). The caller is | |
416 | responsible for freeing the returned string. */ | |
417 | ||
418 | static char * | |
419 | top_level_prompt (void) | |
b5a0ac70 | 420 | { |
608ff013 | 421 | char *prompt; |
b5a0ac70 | 422 | |
ab821bc6 PA |
423 | /* Give observers a chance of changing the prompt. E.g., the python |
424 | `gdb.prompt_hook' is installed as an observer. */ | |
425 | observer_notify_before_prompt (get_prompt ()); | |
426 | ||
608ff013 | 427 | prompt = get_prompt (); |
b5a0ac70 | 428 | |
ab821bc6 | 429 | if (annotation_level >= 2) |
b5a0ac70 | 430 | { |
ab821bc6 | 431 | /* Prefix needs to have new line at end. */ |
608ff013 | 432 | const char prefix[] = "\n\032\032pre-prompt\n"; |
ab821bc6 PA |
433 | |
434 | /* Suffix needs to have a new line at end and \032 \032 at | |
435 | beginning. */ | |
608ff013 | 436 | const char suffix[] = "\n\032\032prompt\n"; |
b5a0ac70 | 437 | |
b36cec19 | 438 | return concat (prefix, prompt, suffix, (char *) NULL); |
608ff013 | 439 | } |
ab821bc6 | 440 | |
608ff013 | 441 | return xstrdup (prompt); |
b5a0ac70 | 442 | } |
c2c6d25f | 443 | |
98d9f24e | 444 | /* See top.h. */ |
73ab01a0 | 445 | |
98d9f24e PA |
446 | struct ui *main_ui; |
447 | struct ui *current_ui; | |
448 | struct ui *ui_list; | |
73ab01a0 | 449 | |
a74e1786 | 450 | /* Get a pointer to the current UI's line buffer. This is used to |
b69d38af PA |
451 | construct a whole line of input from partial input. */ |
452 | ||
453 | static struct buffer * | |
454 | get_command_line_buffer (void) | |
455 | { | |
a74e1786 | 456 | return ¤t_ui->line_buffer; |
b69d38af PA |
457 | } |
458 | ||
187212b3 | 459 | /* When there is an event ready on the stdin file descriptor, instead |
c2c6d25f | 460 | of calling readline directly throught the callback function, or |
c70061cf PA |
461 | instead of calling gdb_readline_no_editing_callback, give gdb a |
462 | chance to detect errors and do something. */ | |
463 | ||
c2c6d25f | 464 | void |
2acceee2 | 465 | stdin_event_handler (int error, gdb_client_data client_data) |
c2c6d25f | 466 | { |
41fd2b0f PA |
467 | struct ui *ui = (struct ui *) client_data; |
468 | ||
c2c6d25f JM |
469 | if (error) |
470 | { | |
07169ff7 PA |
471 | /* Switch to the main UI, so diagnostics always go there. */ |
472 | current_ui = main_ui; | |
473 | ||
41fd2b0f | 474 | delete_file_handler (ui->input_fd); |
07169ff7 PA |
475 | if (main_ui == ui) |
476 | { | |
477 | /* If stdin died, we may as well kill gdb. */ | |
478 | printf_unfiltered (_("error detected on stdin\n")); | |
268a799a | 479 | quit_command ((char *) 0, 0); |
07169ff7 PA |
480 | } |
481 | else | |
482 | { | |
483 | /* Simply delete the UI. */ | |
484 | delete_ui (ui); | |
485 | } | |
c2c6d25f JM |
486 | } |
487 | else | |
d64e57fa | 488 | { |
07169ff7 PA |
489 | /* Switch to the UI whose input descriptor woke up the event |
490 | loop. */ | |
491 | current_ui = ui; | |
492 | ||
493 | /* This makes sure a ^C immediately followed by further input is | |
494 | always processed in that order. E.g,. with input like | |
495 | "^Cprint 1\n", the SIGINT handler runs, marks the async | |
496 | signal handler, and then select/poll may return with stdin | |
497 | ready, instead of -1/EINTR. The | |
498 | gdb.base/double-prompt-target-event-error.exp test exercises | |
499 | this. */ | |
d2acc30b PA |
500 | QUIT; |
501 | ||
d64e57fa PP |
502 | do |
503 | { | |
504 | call_stdin_event_handler_again_p = 0; | |
a74e1786 | 505 | ui->call_readline (client_data); |
07169ff7 PA |
506 | } |
507 | while (call_stdin_event_handler_again_p != 0); | |
d64e57fa | 508 | } |
c2c6d25f JM |
509 | } |
510 | ||
3eb7562a PA |
511 | /* See top.h. */ |
512 | ||
513 | void | |
514 | ui_register_input_event_handler (struct ui *ui) | |
515 | { | |
516 | add_file_handler (ui->input_fd, stdin_event_handler, ui); | |
517 | } | |
518 | ||
519 | /* See top.h. */ | |
520 | ||
521 | void | |
522 | ui_unregister_input_event_handler (struct ui *ui) | |
523 | { | |
524 | delete_file_handler (ui->input_fd); | |
525 | } | |
526 | ||
6426a772 JM |
527 | /* Re-enable stdin after the end of an execution command in |
528 | synchronous mode, or after an error from the target, and we aborted | |
371d5dec | 529 | the exec operation. */ |
6426a772 JM |
530 | |
531 | void | |
712af3be | 532 | async_enable_stdin (void) |
6426a772 | 533 | { |
3b12939d PA |
534 | struct ui *ui = current_ui; |
535 | ||
536 | if (ui->prompt_state == PROMPT_BLOCKED) | |
32c1e744 | 537 | { |
32c1e744 | 538 | target_terminal_ours (); |
3eb7562a | 539 | ui_register_input_event_handler (ui); |
3b12939d | 540 | ui->prompt_state = PROMPT_NEEDED; |
32c1e744 | 541 | } |
6426a772 JM |
542 | } |
543 | ||
544 | /* Disable reads from stdin (the console) marking the command as | |
371d5dec | 545 | synchronous. */ |
6426a772 JM |
546 | |
547 | void | |
548 | async_disable_stdin (void) | |
549 | { | |
3b12939d PA |
550 | struct ui *ui = current_ui; |
551 | ||
552 | ui->prompt_state = PROMPT_BLOCKED; | |
3eb7562a | 553 | delete_file_handler (ui->input_fd); |
6426a772 | 554 | } |
b5a0ac70 | 555 | \f |
6426a772 | 556 | |
b69d38af PA |
557 | /* Handle a gdb command line. This function is called when |
558 | handle_line_of_input has concatenated one or more input lines into | |
559 | a whole command. */ | |
560 | ||
561 | void | |
c2c6d25f | 562 | command_handler (char *command) |
b5a0ac70 | 563 | { |
f38d3ad1 | 564 | struct ui *ui = current_ui; |
b69d38af | 565 | char *c; |
b5a0ac70 | 566 | |
268a799a | 567 | if (ui->instream == ui->stdin_stream) |
b5a0ac70 | 568 | reinitialize_more_filter (); |
b5a0ac70 | 569 | |
1e3b796d | 570 | scoped_command_stats stat_reporter (true); |
b5a0ac70 | 571 | |
b69d38af PA |
572 | /* Do not execute commented lines. */ |
573 | for (c = command; *c == ' ' || *c == '\t'; c++) | |
574 | ; | |
575 | if (c[0] != '#') | |
576 | { | |
268a799a | 577 | execute_command (command, ui->instream == ui->stdin_stream); |
c5aa993b | 578 | |
b69d38af PA |
579 | /* Do any commands attached to breakpoint we stopped at. */ |
580 | bpstat_do_actions (); | |
581 | } | |
43ff13b4 JM |
582 | } |
583 | ||
b69d38af PA |
584 | /* Append RL, an input line returned by readline or one of its |
585 | emulations, to CMD_LINE_BUFFER. Returns the command line if we | |
586 | have a whole command line ready to be processed by the command | |
587 | interpreter or NULL if the command line isn't complete yet (input | |
588 | line ends in a backslash). Takes ownership of RL. */ | |
b5a0ac70 | 589 | |
b69d38af PA |
590 | static char * |
591 | command_line_append_input_line (struct buffer *cmd_line_buffer, char *rl) | |
b5a0ac70 | 592 | { |
b69d38af PA |
593 | char *cmd; |
594 | size_t len; | |
b5a0ac70 | 595 | |
b69d38af | 596 | len = strlen (rl); |
b5a0ac70 | 597 | |
b69d38af | 598 | if (len > 0 && rl[len - 1] == '\\') |
b5a0ac70 | 599 | { |
b69d38af PA |
600 | /* Don't copy the backslash and wait for more. */ |
601 | buffer_grow (cmd_line_buffer, rl, len - 1); | |
602 | cmd = NULL; | |
b5a0ac70 | 603 | } |
b69d38af | 604 | else |
b5a0ac70 | 605 | { |
b69d38af PA |
606 | /* Copy whole line including terminating null, and we're |
607 | done. */ | |
608 | buffer_grow (cmd_line_buffer, rl, len + 1); | |
609 | cmd = cmd_line_buffer->buffer; | |
b5a0ac70 SS |
610 | } |
611 | ||
b69d38af PA |
612 | /* Allocated in readline. */ |
613 | xfree (rl); | |
b5a0ac70 | 614 | |
b69d38af PA |
615 | return cmd; |
616 | } | |
b5a0ac70 | 617 | |
b69d38af | 618 | /* Handle a line of input coming from readline. |
b5a0ac70 | 619 | |
b69d38af PA |
620 | If the read line ends with a continuation character (backslash), |
621 | save the partial input in CMD_LINE_BUFFER (except the backslash), | |
622 | and return NULL. Otherwise, save the partial input and return a | |
623 | pointer to CMD_LINE_BUFFER's buffer (null terminated), indicating a | |
624 | whole command line is ready to be executed. | |
b5a0ac70 | 625 | |
b69d38af | 626 | Returns EOF on end of file. |
b5a0ac70 | 627 | |
b69d38af | 628 | If REPEAT, handle command repetitions: |
b5a0ac70 | 629 | |
b69d38af PA |
630 | - If the input command line is NOT empty, the command returned is |
631 | copied into the global 'saved_command_line' var so that it can | |
632 | be repeated later. | |
d96429cd | 633 | |
b69d38af PA |
634 | - OTOH, if the input command line IS empty, return the previously |
635 | saved command instead of the empty input line. | |
636 | */ | |
b5a0ac70 | 637 | |
b69d38af PA |
638 | char * |
639 | handle_line_of_input (struct buffer *cmd_line_buffer, | |
640 | char *rl, int repeat, char *annotation_suffix) | |
641 | { | |
f38d3ad1 | 642 | struct ui *ui = current_ui; |
268a799a | 643 | int from_tty = ui->instream == ui->stdin_stream; |
b69d38af PA |
644 | char *p1; |
645 | char *cmd; | |
646 | ||
647 | if (rl == NULL) | |
648 | return (char *) EOF; | |
649 | ||
650 | cmd = command_line_append_input_line (cmd_line_buffer, rl); | |
651 | if (cmd == NULL) | |
652 | return NULL; | |
b5a0ac70 | 653 | |
b69d38af PA |
654 | /* We have a complete command line now. Prepare for the next |
655 | command, but leave ownership of memory to the buffer . */ | |
656 | cmd_line_buffer->used_size = 0; | |
657 | ||
268a799a | 658 | if (from_tty && annotation_level > 1) |
b5a0ac70 | 659 | { |
b69d38af PA |
660 | printf_unfiltered (("\n\032\032post-")); |
661 | puts_unfiltered (annotation_suffix); | |
662 | printf_unfiltered (("\n")); | |
663 | } | |
664 | ||
665 | #define SERVER_COMMAND_PREFIX "server " | |
666 | if (startswith (cmd, SERVER_COMMAND_PREFIX)) | |
667 | { | |
668 | /* Note that we don't set `saved_command_line'. Between this | |
669 | and the check in dont_repeat, this insures that repeating | |
670 | will still do the right thing. */ | |
671 | return cmd + strlen (SERVER_COMMAND_PREFIX); | |
b5a0ac70 SS |
672 | } |
673 | ||
674 | /* Do history expansion if that is wished. */ | |
268a799a | 675 | if (history_expansion_p && from_tty && input_interactive_p (current_ui)) |
b5a0ac70 SS |
676 | { |
677 | char *history_value; | |
678 | int expanded; | |
679 | ||
b69d38af | 680 | expanded = history_expand (cmd, &history_value); |
b5a0ac70 SS |
681 | if (expanded) |
682 | { | |
b69d38af PA |
683 | size_t len; |
684 | ||
b5a0ac70 SS |
685 | /* Print the changes. */ |
686 | printf_unfiltered ("%s\n", history_value); | |
687 | ||
688 | /* If there was an error, call this function again. */ | |
689 | if (expanded < 0) | |
690 | { | |
b8c9b27d | 691 | xfree (history_value); |
b69d38af | 692 | return cmd; |
b5a0ac70 | 693 | } |
b69d38af PA |
694 | |
695 | /* history_expand returns an allocated string. Just replace | |
696 | our buffer with it. */ | |
697 | len = strlen (history_value); | |
698 | xfree (buffer_finish (cmd_line_buffer)); | |
699 | cmd_line_buffer->buffer = history_value; | |
700 | cmd_line_buffer->buffer_size = len + 1; | |
701 | cmd = history_value; | |
b5a0ac70 SS |
702 | } |
703 | } | |
704 | ||
371d5dec | 705 | /* If we just got an empty line, and that is supposed to repeat the |
b69d38af PA |
706 | previous command, return the previously saved command. */ |
707 | for (p1 = cmd; *p1 == ' ' || *p1 == '\t'; p1++) | |
708 | ; | |
709 | if (repeat && *p1 == '\0') | |
710 | return saved_command_line; | |
711 | ||
712 | /* Add command to history if appropriate. Note: lines consisting | |
713 | solely of comments are also added to the command history. This | |
714 | is useful when you type a command, and then realize you don't | |
715 | want to execute it quite yet. You can comment out the command | |
716 | and then later fetch it from the value history and remove the | |
717 | '#'. The kill ring is probably better, but some people are in | |
718 | the habit of commenting things out. */ | |
268a799a | 719 | if (*cmd != '\0' && from_tty && input_interactive_p (current_ui)) |
b69d38af | 720 | gdb_add_history (cmd); |
b5a0ac70 | 721 | |
b69d38af PA |
722 | /* Save into global buffer if appropriate. */ |
723 | if (repeat) | |
b5a0ac70 | 724 | { |
b69d38af PA |
725 | xfree (saved_command_line); |
726 | saved_command_line = xstrdup (cmd); | |
727 | return saved_command_line; | |
b5a0ac70 | 728 | } |
b69d38af PA |
729 | else |
730 | return cmd; | |
731 | } | |
b5a0ac70 | 732 | |
b69d38af PA |
733 | /* Handle a complete line of input. This is called by the callback |
734 | mechanism within the readline library. Deal with incomplete | |
735 | commands as well, by saving the partial input in a global | |
736 | buffer. | |
b5a0ac70 | 737 | |
b69d38af PA |
738 | NOTE: This is the asynchronous version of the command_line_input |
739 | function. */ | |
b5a0ac70 | 740 | |
b69d38af PA |
741 | void |
742 | command_line_handler (char *rl) | |
743 | { | |
744 | struct buffer *line_buffer = get_command_line_buffer (); | |
f38d3ad1 | 745 | struct ui *ui = current_ui; |
b69d38af | 746 | char *cmd; |
b5a0ac70 | 747 | |
268a799a | 748 | cmd = handle_line_of_input (line_buffer, rl, 1, "prompt"); |
b69d38af | 749 | if (cmd == (char *) EOF) |
b5a0ac70 | 750 | { |
b69d38af PA |
751 | /* stdin closed. The connection with the terminal is gone. |
752 | This happens at the end of a testsuite run, after Expect has | |
753 | hung up but GDB is still alive. In such a case, we just quit | |
754 | gdb killing the inferior program too. */ | |
755 | printf_unfiltered ("quit\n"); | |
268a799a | 756 | execute_command ("quit", 1); |
b69d38af PA |
757 | } |
758 | else if (cmd == NULL) | |
759 | { | |
760 | /* We don't have a full line yet. Print an empty prompt. */ | |
761 | display_gdb_prompt (""); | |
762 | } | |
763 | else | |
764 | { | |
3b12939d PA |
765 | ui->prompt_state = PROMPT_NEEDED; |
766 | ||
b69d38af | 767 | command_handler (cmd); |
3b12939d PA |
768 | |
769 | if (ui->prompt_state != PROMPTED) | |
770 | display_gdb_prompt (0); | |
b5a0ac70 | 771 | } |
b5a0ac70 SS |
772 | } |
773 | ||
774 | /* Does reading of input from terminal w/o the editing features | |
c70061cf PA |
775 | provided by the readline library. Calls the line input handler |
776 | once we have a whole input line. */ | |
b5a0ac70 | 777 | |
085dd6e6 | 778 | void |
c70061cf | 779 | gdb_readline_no_editing_callback (gdb_client_data client_data) |
b5a0ac70 SS |
780 | { |
781 | int c; | |
782 | char *result; | |
187212b3 | 783 | struct buffer line_buffer; |
7be570e7 | 784 | static int done_once = 0; |
a74e1786 | 785 | struct ui *ui = current_ui; |
7be570e7 | 786 | |
187212b3 PA |
787 | buffer_init (&line_buffer); |
788 | ||
7be570e7 | 789 | /* Unbuffer the input stream, so that, later on, the calls to fgetc |
371d5dec | 790 | fetch only one char at the time from the stream. The fgetc's will |
7be570e7 | 791 | get up to the first newline, but there may be more chars in the |
371d5dec | 792 | stream after '\n'. If we buffer the input and fgetc drains the |
7be570e7 | 793 | stream, getting stuff beyond the newline as well, a select, done |
371d5dec | 794 | afterwards will not trigger. */ |
f38d3ad1 | 795 | if (!done_once && !ISATTY (ui->instream)) |
7be570e7 | 796 | { |
f38d3ad1 | 797 | setbuf (ui->instream, NULL); |
7be570e7 JM |
798 | done_once = 1; |
799 | } | |
b5a0ac70 | 800 | |
b5a0ac70 | 801 | /* We still need the while loop here, even though it would seem |
c70061cf PA |
802 | obvious to invoke gdb_readline_no_editing_callback at every |
803 | character entered. If not using the readline library, the | |
804 | terminal is in cooked mode, which sends the characters all at | |
805 | once. Poll will notice that the input fd has changed state only | |
806 | after enter is pressed. At this point we still need to fetch all | |
807 | the chars entered. */ | |
b5a0ac70 SS |
808 | |
809 | while (1) | |
810 | { | |
811 | /* Read from stdin if we are executing a user defined command. | |
812 | This is the right thing for prompt_for_continue, at least. */ | |
268a799a | 813 | c = fgetc (ui->instream != NULL ? ui->instream : ui->stdin_stream); |
b5a0ac70 SS |
814 | |
815 | if (c == EOF) | |
816 | { | |
187212b3 PA |
817 | if (line_buffer.used_size > 0) |
818 | { | |
819 | /* The last line does not end with a newline. Return it, and | |
820 | if we are called again fgetc will still return EOF and | |
821 | we'll return NULL then. */ | |
822 | break; | |
823 | } | |
824 | xfree (buffer_finish (&line_buffer)); | |
a74e1786 | 825 | ui->input_handler (NULL); |
13ce7133 | 826 | return; |
b5a0ac70 SS |
827 | } |
828 | ||
829 | if (c == '\n') | |
b5a0ac70 | 830 | { |
187212b3 PA |
831 | if (line_buffer.used_size > 0 |
832 | && line_buffer.buffer[line_buffer.used_size - 1] == '\r') | |
833 | line_buffer.used_size--; | |
b5a0ac70 SS |
834 | break; |
835 | } | |
b5a0ac70 | 836 | |
187212b3 | 837 | buffer_grow_char (&line_buffer, c); |
b5a0ac70 SS |
838 | } |
839 | ||
187212b3 PA |
840 | buffer_grow_char (&line_buffer, '\0'); |
841 | result = buffer_finish (&line_buffer); | |
a74e1786 | 842 | ui->input_handler (result); |
b5a0ac70 SS |
843 | } |
844 | \f | |
845 | ||
f0881b37 PA |
846 | /* The serial event associated with the QUIT flag. set_quit_flag sets |
847 | this, and check_quit_flag clears it. Used by interruptible_select | |
848 | to be able to do interruptible I/O with no race with the SIGINT | |
849 | handler. */ | |
850 | static struct serial_event *quit_serial_event; | |
851 | ||
b5a0ac70 | 852 | /* Initialization of signal handlers and tokens. There is a function |
371d5dec | 853 | handle_sig* for each of the signals GDB cares about. Specifically: |
b5a0ac70 SS |
854 | SIGINT, SIGFPE, SIGQUIT, SIGTSTP, SIGHUP, SIGWINCH. These |
855 | functions are the actual signal handlers associated to the signals | |
856 | via calls to signal(). The only job for these functions is to | |
857 | enqueue the appropriate event/procedure with the event loop. Such | |
371d5dec | 858 | procedures are the old signal handlers. The event loop will take |
b5a0ac70 | 859 | care of invoking the queued procedures to perform the usual tasks |
371d5dec | 860 | associated with the reception of the signal. */ |
392a587b | 861 | /* NOTE: 1999-04-30 This is the asynchronous version of init_signals. |
b5a0ac70 | 862 | init_signals will become obsolete as we move to have to event loop |
371d5dec | 863 | as the default for gdb. */ |
b5a0ac70 | 864 | void |
c2c6d25f | 865 | async_init_signals (void) |
c5aa993b | 866 | { |
5cc3ce8b PA |
867 | initialize_async_signal_handlers (); |
868 | ||
f0881b37 PA |
869 | quit_serial_event = make_serial_event (); |
870 | ||
b5a0ac70 SS |
871 | signal (SIGINT, handle_sigint); |
872 | sigint_token = | |
0f71a2f6 | 873 | create_async_signal_handler (async_request_quit, NULL); |
a7266fef | 874 | signal (SIGTERM, handle_sigterm); |
06c868a8 JK |
875 | async_sigterm_token |
876 | = create_async_signal_handler (async_sigterm_handler, NULL); | |
b5a0ac70 SS |
877 | |
878 | /* If SIGTRAP was set to SIG_IGN, then the SIG_IGN will get passed | |
879 | to the inferior and breakpoints will be ignored. */ | |
880 | #ifdef SIGTRAP | |
881 | signal (SIGTRAP, SIG_DFL); | |
882 | #endif | |
883 | ||
6d318c73 | 884 | #ifdef SIGQUIT |
b5a0ac70 SS |
885 | /* If we initialize SIGQUIT to SIG_IGN, then the SIG_IGN will get |
886 | passed to the inferior, which we don't want. It would be | |
887 | possible to do a "signal (SIGQUIT, SIG_DFL)" after we fork, but | |
888 | on BSD4.3 systems using vfork, that can affect the | |
889 | GDB process as well as the inferior (the signal handling tables | |
890 | might be in memory, shared between the two). Since we establish | |
891 | a handler for SIGQUIT, when we call exec it will set the signal | |
892 | to SIG_DFL for us. */ | |
893 | signal (SIGQUIT, handle_sigquit); | |
894 | sigquit_token = | |
0f71a2f6 | 895 | create_async_signal_handler (async_do_nothing, NULL); |
6d318c73 | 896 | #endif |
b5a0ac70 SS |
897 | #ifdef SIGHUP |
898 | if (signal (SIGHUP, handle_sighup) != SIG_IGN) | |
899 | sighup_token = | |
0f71a2f6 | 900 | create_async_signal_handler (async_disconnect, NULL); |
b5a0ac70 SS |
901 | else |
902 | sighup_token = | |
0f71a2f6 | 903 | create_async_signal_handler (async_do_nothing, NULL); |
b5a0ac70 SS |
904 | #endif |
905 | signal (SIGFPE, handle_sigfpe); | |
906 | sigfpe_token = | |
0f71a2f6 | 907 | create_async_signal_handler (async_float_handler, NULL); |
b5a0ac70 | 908 | |
0f71a2f6 JM |
909 | #ifdef STOP_SIGNAL |
910 | sigtstp_token = | |
911 | create_async_signal_handler (async_stop_sig, NULL); | |
912 | #endif | |
0f71a2f6 JM |
913 | } |
914 | ||
f0881b37 PA |
915 | /* See defs.h. */ |
916 | ||
917 | void | |
918 | quit_serial_event_set (void) | |
919 | { | |
920 | serial_event_set (quit_serial_event); | |
921 | } | |
922 | ||
923 | /* See defs.h. */ | |
924 | ||
925 | void | |
926 | quit_serial_event_clear (void) | |
927 | { | |
928 | serial_event_clear (quit_serial_event); | |
929 | } | |
930 | ||
931 | /* Return the selectable file descriptor of the serial event | |
932 | associated with the quit flag. */ | |
933 | ||
934 | static int | |
935 | quit_serial_event_fd (void) | |
936 | { | |
937 | return serial_event_fd (quit_serial_event); | |
938 | } | |
939 | ||
048094ac PA |
940 | /* See defs.h. */ |
941 | ||
942 | void | |
943 | default_quit_handler (void) | |
944 | { | |
945 | if (check_quit_flag ()) | |
946 | { | |
947 | if (target_terminal_is_ours ()) | |
948 | quit (); | |
949 | else | |
950 | target_pass_ctrlc (); | |
951 | } | |
952 | } | |
953 | ||
954 | /* See defs.h. */ | |
955 | quit_handler_ftype *quit_handler = default_quit_handler; | |
956 | ||
957 | /* Data for make_cleanup_override_quit_handler. Wrap the previous | |
958 | handler pointer in a data struct because it's not portable to cast | |
959 | a function pointer to a data pointer, which is what make_cleanup | |
960 | expects. */ | |
961 | struct quit_handler_cleanup_data | |
962 | { | |
963 | /* The previous quit handler. */ | |
964 | quit_handler_ftype *prev_handler; | |
965 | }; | |
966 | ||
967 | /* Cleanup call that restores the previous quit handler. */ | |
968 | ||
969 | static void | |
970 | restore_quit_handler (void *arg) | |
971 | { | |
972 | struct quit_handler_cleanup_data *data | |
973 | = (struct quit_handler_cleanup_data *) arg; | |
974 | ||
975 | quit_handler = data->prev_handler; | |
976 | } | |
977 | ||
978 | /* Destructor for the quit handler cleanup. */ | |
979 | ||
980 | static void | |
981 | restore_quit_handler_dtor (void *arg) | |
982 | { | |
983 | xfree (arg); | |
984 | } | |
985 | ||
986 | /* See defs.h. */ | |
987 | ||
988 | struct cleanup * | |
989 | make_cleanup_override_quit_handler (quit_handler_ftype *new_quit_handler) | |
990 | { | |
991 | struct cleanup *old_chain; | |
992 | struct quit_handler_cleanup_data *data; | |
993 | ||
994 | data = XNEW (struct quit_handler_cleanup_data); | |
995 | data->prev_handler = quit_handler; | |
996 | old_chain = make_cleanup_dtor (restore_quit_handler, data, | |
997 | restore_quit_handler_dtor); | |
998 | quit_handler = new_quit_handler; | |
999 | return old_chain; | |
1000 | } | |
1001 | ||
f0881b37 PA |
1002 | /* Handle a SIGINT. */ |
1003 | ||
c5aa993b | 1004 | void |
c2c6d25f | 1005 | handle_sigint (int sig) |
b5a0ac70 SS |
1006 | { |
1007 | signal (sig, handle_sigint); | |
1008 | ||
5f960e00 FF |
1009 | /* We could be running in a loop reading in symfiles or something so |
1010 | it may be quite a while before we get back to the event loop. So | |
371d5dec | 1011 | set quit_flag to 1 here. Then if QUIT is called before we get to |
5f960e00 | 1012 | the event loop, we will unwind as expected. */ |
522002f9 | 1013 | set_quit_flag (); |
5f960e00 | 1014 | |
585a46a2 PA |
1015 | /* In case nothing calls QUIT before the event loop is reached, the |
1016 | event loop handles it. */ | |
1017 | mark_async_signal_handler (sigint_token); | |
b5a0ac70 SS |
1018 | } |
1019 | ||
f0881b37 PA |
1020 | /* See gdb_select.h. */ |
1021 | ||
1022 | int | |
1023 | interruptible_select (int n, | |
1024 | fd_set *readfds, fd_set *writefds, fd_set *exceptfds, | |
1025 | struct timeval *timeout) | |
1026 | { | |
1027 | fd_set my_readfds; | |
1028 | int fd; | |
1029 | int res; | |
1030 | ||
1031 | if (readfds == NULL) | |
1032 | { | |
1033 | readfds = &my_readfds; | |
1034 | FD_ZERO (&my_readfds); | |
1035 | } | |
1036 | ||
1037 | fd = quit_serial_event_fd (); | |
1038 | FD_SET (fd, readfds); | |
1039 | if (n <= fd) | |
1040 | n = fd + 1; | |
1041 | ||
1042 | do | |
1043 | { | |
1044 | res = gdb_select (n, readfds, writefds, exceptfds, timeout); | |
1045 | } | |
1046 | while (res == -1 && errno == EINTR); | |
1047 | ||
1048 | if (res == 1 && FD_ISSET (fd, readfds)) | |
1049 | { | |
1050 | errno = EINTR; | |
1051 | return -1; | |
1052 | } | |
1053 | return res; | |
1054 | } | |
1055 | ||
06c868a8 JK |
1056 | /* Handle GDB exit upon receiving SIGTERM if target_can_async_p (). */ |
1057 | ||
1058 | static void | |
1059 | async_sigterm_handler (gdb_client_data arg) | |
1060 | { | |
268a799a | 1061 | quit_force (NULL, 0); |
06c868a8 JK |
1062 | } |
1063 | ||
1064 | /* See defs.h. */ | |
1065 | volatile int sync_quit_force_run; | |
1066 | ||
a7266fef AS |
1067 | /* Quit GDB if SIGTERM is received. |
1068 | GDB would quit anyway, but this way it will clean up properly. */ | |
1069 | void | |
1070 | handle_sigterm (int sig) | |
1071 | { | |
1072 | signal (sig, handle_sigterm); | |
06c868a8 | 1073 | |
077836f7 PP |
1074 | sync_quit_force_run = 1; |
1075 | set_quit_flag (); | |
1076 | ||
1077 | mark_async_signal_handler (async_sigterm_token); | |
a7266fef AS |
1078 | } |
1079 | ||
371d5dec | 1080 | /* Do the quit. All the checks have been done by the caller. */ |
c5aa993b | 1081 | void |
c2c6d25f | 1082 | async_request_quit (gdb_client_data arg) |
b5a0ac70 | 1083 | { |
5f960e00 | 1084 | /* If the quit_flag has gotten reset back to 0 by the time we get |
4ac94eda FF |
1085 | back here, that means that an exception was thrown to unwind the |
1086 | current command before we got back to the event loop. So there | |
522002f9 | 1087 | is no reason to call quit again here. */ |
048094ac | 1088 | QUIT; |
b5a0ac70 SS |
1089 | } |
1090 | ||
6d318c73 | 1091 | #ifdef SIGQUIT |
371d5dec MS |
1092 | /* Tell the event loop what to do if SIGQUIT is received. |
1093 | See event-signal.c. */ | |
c5aa993b | 1094 | static void |
c2c6d25f | 1095 | handle_sigquit (int sig) |
b5a0ac70 | 1096 | { |
f6fbab7d | 1097 | mark_async_signal_handler (sigquit_token); |
b5a0ac70 SS |
1098 | signal (sig, handle_sigquit); |
1099 | } | |
6d318c73 | 1100 | #endif |
b5a0ac70 | 1101 | |
0f0b8dcd DJ |
1102 | #if defined (SIGQUIT) || defined (SIGHUP) |
1103 | /* Called by the event loop in response to a SIGQUIT or an | |
1104 | ignored SIGHUP. */ | |
c5aa993b | 1105 | static void |
c2c6d25f | 1106 | async_do_nothing (gdb_client_data arg) |
b5a0ac70 | 1107 | { |
371d5dec | 1108 | /* Empty function body. */ |
b5a0ac70 | 1109 | } |
0f0b8dcd | 1110 | #endif |
b5a0ac70 SS |
1111 | |
1112 | #ifdef SIGHUP | |
371d5dec MS |
1113 | /* Tell the event loop what to do if SIGHUP is received. |
1114 | See event-signal.c. */ | |
c5aa993b | 1115 | static void |
fba45db2 | 1116 | handle_sighup (int sig) |
b5a0ac70 | 1117 | { |
f6fbab7d | 1118 | mark_async_signal_handler (sighup_token); |
b5a0ac70 SS |
1119 | signal (sig, handle_sighup); |
1120 | } | |
1121 | ||
371d5dec | 1122 | /* Called by the event loop to process a SIGHUP. */ |
c5aa993b | 1123 | static void |
c2c6d25f | 1124 | async_disconnect (gdb_client_data arg) |
b5a0ac70 | 1125 | { |
b2cd6b29 | 1126 | |
492d29ea | 1127 | TRY |
b2cd6b29 JM |
1128 | { |
1129 | quit_cover (); | |
1130 | } | |
1131 | ||
492d29ea | 1132 | CATCH (exception, RETURN_MASK_ALL) |
b2cd6b29 JM |
1133 | { |
1134 | fputs_filtered ("Could not kill the program being debugged", | |
1135 | gdb_stderr); | |
1136 | exception_print (gdb_stderr, exception); | |
1137 | } | |
492d29ea | 1138 | END_CATCH |
b2cd6b29 | 1139 | |
492d29ea | 1140 | TRY |
b2cd6b29 | 1141 | { |
460014f5 | 1142 | pop_all_targets (); |
b2cd6b29 | 1143 | } |
492d29ea PA |
1144 | CATCH (exception, RETURN_MASK_ALL) |
1145 | { | |
1146 | } | |
1147 | END_CATCH | |
b2cd6b29 | 1148 | |
371d5dec | 1149 | signal (SIGHUP, SIG_DFL); /*FIXME: ??????????? */ |
ec4dfccf | 1150 | raise (SIGHUP); |
b5a0ac70 SS |
1151 | } |
1152 | #endif | |
1153 | ||
0f71a2f6 | 1154 | #ifdef STOP_SIGNAL |
c5aa993b | 1155 | void |
c2c6d25f | 1156 | handle_stop_sig (int sig) |
0f71a2f6 | 1157 | { |
f6fbab7d | 1158 | mark_async_signal_handler (sigtstp_token); |
c5aa993b | 1159 | signal (sig, handle_stop_sig); |
0f71a2f6 JM |
1160 | } |
1161 | ||
1162 | static void | |
c2c6d25f | 1163 | async_stop_sig (gdb_client_data arg) |
0f71a2f6 | 1164 | { |
ab821bc6 | 1165 | char *prompt = get_prompt (); |
d7f9d729 | 1166 | |
0f71a2f6 JM |
1167 | #if STOP_SIGNAL == SIGTSTP |
1168 | signal (SIGTSTP, SIG_DFL); | |
2acceee2 JM |
1169 | #if HAVE_SIGPROCMASK |
1170 | { | |
1171 | sigset_t zero; | |
46711df8 | 1172 | |
2acceee2 JM |
1173 | sigemptyset (&zero); |
1174 | sigprocmask (SIG_SETMASK, &zero, 0); | |
1175 | } | |
46711df8 | 1176 | #elif HAVE_SIGSETMASK |
0f71a2f6 | 1177 | sigsetmask (0); |
2acceee2 | 1178 | #endif |
ec4dfccf | 1179 | raise (SIGTSTP); |
0f71a2f6 JM |
1180 | signal (SIGTSTP, handle_stop_sig); |
1181 | #else | |
1182 | signal (STOP_SIGNAL, handle_stop_sig); | |
1183 | #endif | |
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 | } | |
1191 | #endif /* STOP_SIGNAL */ | |
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 | ||
371d5dec | 1202 | /* Event loop will call this functin 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) |
694ec099 PA |
1227 | gdb_stdout = stdio_fileopen (ui->outstream); |
1228 | gdb_stderr = stderr_fileopen (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 | } |