Commit | Line | Data |
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b5a0ac70 | 1 | /* Top level stuff for GDB, the GNU debugger. |
637537d0 | 2 | |
618f726f | 3 | Copyright (C) 1999-2016 Free Software Foundation, Inc. |
637537d0 | 4 | |
b5a0ac70 SS |
5 | Written by Elena Zannoni <ezannoni@cygnus.com> of Cygnus Solutions. |
6 | ||
7 | This file is part of GDB. | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 11 | the Free Software Foundation; either version 3 of the License, or |
b5a0ac70 SS |
12 | (at your option) any later version. |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
371d5dec | 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
b5a0ac70 SS |
21 | |
22 | #include "defs.h" | |
0f71a2f6 | 23 | #include "top.h" |
b5a0ac70 | 24 | #include "inferior.h" |
45741a9c | 25 | #include "infrun.h" |
e514a9d6 | 26 | #include "target.h" |
c5aa993b | 27 | #include "terminal.h" /* for job_control */ |
9e0b60a8 | 28 | #include "event-loop.h" |
c2c6d25f | 29 | #include "event-top.h" |
4389a95a | 30 | #include "interps.h" |
042be3a9 | 31 | #include <signal.h> |
16026cd7 | 32 | #include "cli/cli-script.h" /* for reset_command_nest_depth */ |
d01a8610 | 33 | #include "main.h" |
8ea051c5 | 34 | #include "gdbthread.h" |
d17b6f81 | 35 | #include "observer.h" |
be34f849 | 36 | #include "continuations.h" |
371d5dec | 37 | #include "gdbcmd.h" /* for dont_repeat() */ |
bd00c694 | 38 | #include "annotate.h" |
bd712aed | 39 | #include "maint.h" |
187212b3 | 40 | #include "buffer.h" |
f0881b37 PA |
41 | #include "ser-event.h" |
42 | #include "gdb_select.h" | |
104c1213 | 43 | |
371d5dec | 44 | /* readline include files. */ |
dbda9972 AC |
45 | #include "readline/readline.h" |
46 | #include "readline/history.h" | |
b5a0ac70 SS |
47 | |
48 | /* readline defines this. */ | |
49 | #undef savestring | |
50 | ||
c2c6d25f | 51 | static void command_line_handler (char *rl); |
c2c6d25f | 52 | static void change_line_handler (void); |
ab821bc6 | 53 | static char *top_level_prompt (void); |
b5a0ac70 | 54 | |
371d5dec | 55 | /* Signal handlers. */ |
6d318c73 | 56 | #ifdef SIGQUIT |
c2c6d25f | 57 | static void handle_sigquit (int sig); |
6d318c73 | 58 | #endif |
0f0b8dcd | 59 | #ifdef SIGHUP |
c2c6d25f | 60 | static void handle_sighup (int sig); |
0f0b8dcd | 61 | #endif |
c2c6d25f | 62 | static void handle_sigfpe (int sig); |
b5a0ac70 SS |
63 | |
64 | /* Functions to be invoked by the event loop in response to | |
371d5dec | 65 | signals. */ |
0f0b8dcd | 66 | #if defined (SIGQUIT) || defined (SIGHUP) |
c2c6d25f | 67 | static void async_do_nothing (gdb_client_data); |
0f0b8dcd DJ |
68 | #endif |
69 | #ifdef SIGHUP | |
c2c6d25f | 70 | static void async_disconnect (gdb_client_data); |
0f0b8dcd | 71 | #endif |
c2c6d25f | 72 | static void async_float_handler (gdb_client_data); |
0f0b8dcd | 73 | #ifdef STOP_SIGNAL |
c2c6d25f | 74 | static void async_stop_sig (gdb_client_data); |
0f0b8dcd | 75 | #endif |
06c868a8 | 76 | static void async_sigterm_handler (gdb_client_data arg); |
b5a0ac70 | 77 | |
b5a0ac70 | 78 | /* Readline offers an alternate interface, via callback |
371d5dec | 79 | functions. These are all included in the file callback.c in the |
b5a0ac70 SS |
80 | readline distribution. This file provides (mainly) a function, which |
81 | the event loop uses as callback (i.e. event handler) whenever an event | |
82 | is detected on the standard input file descriptor. | |
83 | readline_callback_read_char is called (by the GDB event loop) whenever | |
371d5dec | 84 | there is a new character ready on the input stream. This function |
b5a0ac70 SS |
85 | incrementally builds a buffer internal to readline where it |
86 | accumulates the line read up to the point of invocation. In the | |
87 | special case in which the character read is newline, the function | |
88 | invokes a GDB supplied callback routine, which does the processing of | |
89 | a full command line. This latter routine is the asynchronous analog | |
371d5dec | 90 | of the old command_line_input in gdb. Instead of invoking (and waiting |
b5a0ac70 SS |
91 | for) readline to read the command line and pass it back to |
92 | command_loop for processing, the new command_line_handler function has | |
93 | the command line already available as its parameter. INPUT_HANDLER is | |
94 | to be set to the function that readline will invoke when a complete | |
95 | line of input is ready. CALL_READLINE is to be set to the function | |
371d5dec | 96 | that readline offers as callback to the event_loop. */ |
b5a0ac70 | 97 | |
c2c6d25f JM |
98 | void (*input_handler) (char *); |
99 | void (*call_readline) (gdb_client_data); | |
b5a0ac70 | 100 | |
371d5dec | 101 | /* Important variables for the event loop. */ |
b5a0ac70 SS |
102 | |
103 | /* This is used to determine if GDB is using the readline library or | |
371d5dec | 104 | its own simplified form of readline. It is used by the asynchronous |
0f71a2f6 | 105 | form of the set editing command. |
392a587b | 106 | ezannoni: as of 1999-04-29 I expect that this |
b5a0ac70 | 107 | variable will not be used after gdb is changed to use the event |
371d5dec | 108 | loop as default engine, and event-top.c is merged into top.c. */ |
b5a0ac70 SS |
109 | int async_command_editing_p; |
110 | ||
104c1213 | 111 | /* This is used to display the notification of the completion of an |
371d5dec | 112 | asynchronous execution command. */ |
104c1213 JM |
113 | int exec_done_display_p = 0; |
114 | ||
b5a0ac70 | 115 | /* This is the file descriptor for the input stream that GDB uses to |
371d5dec | 116 | read commands from. */ |
b5a0ac70 SS |
117 | int input_fd; |
118 | ||
d64e57fa PP |
119 | /* Used by the stdin event handler to compensate for missed stdin events. |
120 | Setting this to a non-zero value inside an stdin callback makes the callback | |
121 | run again. */ | |
122 | int call_stdin_event_handler_again_p; | |
123 | ||
371d5dec | 124 | /* Signal handling variables. */ |
b5a0ac70 | 125 | /* Each of these is a pointer to a function that the event loop will |
371d5dec | 126 | invoke if the corresponding signal has received. The real signal |
b5a0ac70 | 127 | handlers mark these functions as ready to be executed and the event |
371d5dec MS |
128 | loop, in a later iteration, calls them. See the function |
129 | invoke_async_signal_handler. */ | |
05fa9251 | 130 | static struct async_signal_handler *sigint_token; |
b5a0ac70 | 131 | #ifdef SIGHUP |
05fa9251 | 132 | static struct async_signal_handler *sighup_token; |
b5a0ac70 | 133 | #endif |
6d318c73 | 134 | #ifdef SIGQUIT |
05fa9251 | 135 | static struct async_signal_handler *sigquit_token; |
6d318c73 | 136 | #endif |
05fa9251 | 137 | static struct async_signal_handler *sigfpe_token; |
0f71a2f6 | 138 | #ifdef STOP_SIGNAL |
05fa9251 | 139 | static struct async_signal_handler *sigtstp_token; |
0f71a2f6 | 140 | #endif |
06c868a8 | 141 | static struct async_signal_handler *async_sigterm_token; |
0f71a2f6 | 142 | |
3c610247 | 143 | /* This hook is called by gdb_rl_callback_read_char_wrapper after each |
467d8519 | 144 | character is processed. */ |
b08ee6a2 | 145 | void (*after_char_processing_hook) (void); |
b5a0ac70 SS |
146 | \f |
147 | ||
89525768 PA |
148 | /* Wrapper function for calling into the readline library. This takes |
149 | care of a couple things: | |
150 | ||
151 | - The event loop expects the callback function to have a parameter, | |
152 | while readline expects none. | |
153 | ||
154 | - Propagation of GDB exceptions/errors thrown from INPUT_HANDLER | |
155 | across readline requires special handling. | |
156 | ||
157 | On the exceptions issue: | |
158 | ||
159 | DWARF-based unwinding cannot cross code built without -fexceptions. | |
160 | Any exception that tries to propagate through such code will fail | |
161 | and the result is a call to std::terminate. While some ABIs, such | |
162 | as x86-64, require all code to be built with exception tables, | |
163 | others don't. | |
164 | ||
165 | This is a problem when GDB calls some non-EH-aware C library code, | |
166 | that calls into GDB again through a callback, and that GDB callback | |
167 | code throws a C++ exception. Turns out this is exactly what | |
168 | happens with GDB's readline callback. | |
169 | ||
170 | In such cases, we must catch and save any C++ exception that might | |
171 | be thrown from the GDB callback before returning to the | |
172 | non-EH-aware code. When the non-EH-aware function itself returns | |
173 | back to GDB, we then rethrow the original C++ exception. | |
174 | ||
175 | In the readline case however, the right thing to do is to longjmp | |
176 | out of the callback, rather than do a normal return -- there's no | |
177 | way for the callback to return to readline an indication that an | |
178 | error happened, so a normal return would have rl_callback_read_char | |
179 | potentially continue processing further input, redisplay the | |
180 | prompt, etc. Instead of raw setjmp/longjmp however, we use our | |
181 | sjlj-based TRY/CATCH mechanism, which knows to handle multiple | |
182 | levels of active setjmp/longjmp frames, needed in order to handle | |
183 | the readline callback recursing, as happens with e.g., secondary | |
184 | prompts / queries, through gdb_readline_wrapper. */ | |
185 | ||
c2c6d25f | 186 | static void |
3c610247 | 187 | gdb_rl_callback_read_char_wrapper (gdb_client_data client_data) |
c2c6d25f | 188 | { |
89525768 PA |
189 | struct gdb_exception gdb_expt = exception_none; |
190 | ||
191 | /* C++ exceptions can't normally be thrown across readline (unless | |
192 | it is built with -fexceptions, but it won't by default on many | |
193 | ABIs). So we instead wrap the readline call with a sjlj-based | |
194 | TRY/CATCH, and rethrow the GDB exception once back in GDB. */ | |
195 | TRY_SJLJ | |
196 | { | |
197 | rl_callback_read_char (); | |
198 | if (after_char_processing_hook) | |
199 | (*after_char_processing_hook) (); | |
200 | } | |
201 | CATCH_SJLJ (ex, RETURN_MASK_ALL) | |
202 | { | |
203 | gdb_expt = ex; | |
204 | } | |
205 | END_CATCH_SJLJ | |
206 | ||
207 | /* Rethrow using the normal EH mechanism. */ | |
208 | if (gdb_expt.reason < 0) | |
209 | throw_exception (gdb_expt); | |
210 | } | |
211 | ||
212 | /* GDB's readline callback handler. Calls the current INPUT_HANDLER, | |
213 | and propagates GDB exceptions/errors thrown from INPUT_HANDLER back | |
214 | across readline. See gdb_rl_callback_read_char_wrapper. */ | |
215 | ||
216 | static void | |
217 | gdb_rl_callback_handler (char *rl) | |
218 | { | |
219 | struct gdb_exception gdb_rl_expt = exception_none; | |
220 | ||
221 | TRY | |
222 | { | |
223 | input_handler (rl); | |
224 | } | |
225 | CATCH (ex, RETURN_MASK_ALL) | |
226 | { | |
227 | gdb_rl_expt = ex; | |
228 | } | |
229 | END_CATCH | |
230 | ||
231 | /* If we caught a GDB exception, longjmp out of the readline | |
232 | callback. There's no other way for the callback to signal to | |
233 | readline that an error happened. A normal return would have | |
234 | readline potentially continue processing further input, redisplay | |
235 | the prompt, etc. (This is what GDB historically did when it was | |
236 | a C program.) Note that since we're long jumping, local variable | |
237 | dtors are NOT run automatically. */ | |
238 | if (gdb_rl_expt.reason < 0) | |
239 | throw_exception_sjlj (gdb_rl_expt); | |
c2c6d25f JM |
240 | } |
241 | ||
b5a0ac70 | 242 | /* Initialize all the necessary variables, start the event loop, |
4d09c5b4 AB |
243 | register readline, and stdin, start the loop. The DATA is the |
244 | interpreter data cookie, ignored for now. */ | |
245 | ||
b5a0ac70 | 246 | void |
4d09c5b4 | 247 | cli_command_loop (void *data) |
b5a0ac70 | 248 | { |
7d8e6458 | 249 | display_gdb_prompt (0); |
b5a0ac70 | 250 | |
371d5dec | 251 | /* Now it's time to start the event loop. */ |
085dd6e6 | 252 | start_event_loop (); |
b5a0ac70 SS |
253 | } |
254 | ||
255 | /* Change the function to be invoked every time there is a character | |
371d5dec | 256 | ready on stdin. This is used when the user sets the editing off, |
b5a0ac70 | 257 | therefore bypassing readline, and letting gdb handle the input |
c70061cf PA |
258 | itself, via gdb_readline_no_editing_callback. Also it is used in |
259 | the opposite case in which the user sets editing on again, by | |
260 | restoring readline handling of the input. */ | |
392a587b | 261 | static void |
c2c6d25f | 262 | change_line_handler (void) |
b5a0ac70 | 263 | { |
371d5dec MS |
264 | /* NOTE: this operates on input_fd, not instream. If we are reading |
265 | commands from a file, instream will point to the file. However in | |
c2c6d25f | 266 | async mode, we always read commands from a file with editing |
371d5dec MS |
267 | off. This means that the 'set editing on/off' will have effect |
268 | only on the interactive session. */ | |
c2c6d25f | 269 | |
b5a0ac70 SS |
270 | if (async_command_editing_p) |
271 | { | |
371d5dec | 272 | /* Turn on editing by using readline. */ |
3c610247 | 273 | call_readline = gdb_rl_callback_read_char_wrapper; |
0f71a2f6 | 274 | input_handler = command_line_handler; |
b5a0ac70 SS |
275 | } |
276 | else | |
277 | { | |
c70061cf | 278 | /* Turn off editing by using gdb_readline_no_editing_callback. */ |
d3d4baed | 279 | gdb_rl_callback_handler_remove (); |
c70061cf | 280 | call_readline = gdb_readline_no_editing_callback; |
0f71a2f6 JM |
281 | |
282 | /* Set up the command handler as well, in case we are called as | |
371d5dec | 283 | first thing from .gdbinit. */ |
0f71a2f6 | 284 | input_handler = command_line_handler; |
b5a0ac70 | 285 | } |
b5a0ac70 SS |
286 | } |
287 | ||
d3d4baed PA |
288 | /* The functions below are wrappers for rl_callback_handler_remove and |
289 | rl_callback_handler_install that keep track of whether the callback | |
290 | handler is installed in readline. This is necessary because after | |
291 | handling a target event of a background execution command, we may | |
292 | need to reinstall the callback handler if it was removed due to a | |
293 | secondary prompt. See gdb_readline_wrapper_line. We don't | |
294 | unconditionally install the handler for every target event because | |
295 | that also clears the line buffer, thus installing it while the user | |
296 | is typing would lose input. */ | |
297 | ||
298 | /* Whether we've registered a callback handler with readline. */ | |
299 | static int callback_handler_installed; | |
300 | ||
301 | /* See event-top.h, and above. */ | |
302 | ||
303 | void | |
304 | gdb_rl_callback_handler_remove (void) | |
305 | { | |
306 | rl_callback_handler_remove (); | |
307 | callback_handler_installed = 0; | |
308 | } | |
309 | ||
310 | /* See event-top.h, and above. Note this wrapper doesn't have an | |
311 | actual callback parameter because we always install | |
312 | INPUT_HANDLER. */ | |
313 | ||
314 | void | |
315 | gdb_rl_callback_handler_install (const char *prompt) | |
316 | { | |
317 | /* Calling rl_callback_handler_install resets readline's input | |
318 | buffer. Calling this when we were already processing input | |
319 | therefore loses input. */ | |
320 | gdb_assert (!callback_handler_installed); | |
321 | ||
89525768 | 322 | rl_callback_handler_install (prompt, gdb_rl_callback_handler); |
d3d4baed PA |
323 | callback_handler_installed = 1; |
324 | } | |
325 | ||
326 | /* See event-top.h, and above. */ | |
327 | ||
328 | void | |
329 | gdb_rl_callback_handler_reinstall (void) | |
330 | { | |
331 | if (!callback_handler_installed) | |
332 | { | |
333 | /* Passing NULL as prompt argument tells readline to not display | |
334 | a prompt. */ | |
335 | gdb_rl_callback_handler_install (NULL); | |
336 | } | |
337 | } | |
338 | ||
ab821bc6 PA |
339 | /* Displays the prompt. If the argument NEW_PROMPT is NULL, the |
340 | prompt that is displayed is the current top level prompt. | |
341 | Otherwise, it displays whatever NEW_PROMPT is as a local/secondary | |
342 | prompt. | |
343 | ||
344 | This is used after each gdb command has completed, and in the | |
345 | following cases: | |
346 | ||
371d5dec | 347 | 1. When the user enters a command line which is ended by '\' |
ab821bc6 PA |
348 | indicating that the command will continue on the next line. In |
349 | that case the prompt that is displayed is the empty string. | |
350 | ||
0f71a2f6 | 351 | 2. When the user is entering 'commands' for a breakpoint, or |
371d5dec | 352 | actions for a tracepoint. In this case the prompt will be '>' |
ab821bc6 PA |
353 | |
354 | 3. On prompting for pagination. */ | |
355 | ||
b5a0ac70 | 356 | void |
38bcc89d | 357 | display_gdb_prompt (const char *new_prompt) |
b5a0ac70 | 358 | { |
d17b6f81 | 359 | char *actual_gdb_prompt = NULL; |
ab821bc6 | 360 | struct cleanup *old_chain; |
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 | 367 | old_chain = make_cleanup (free_current_contents, &actual_gdb_prompt); |
d17b6f81 | 368 | |
ab821bc6 PA |
369 | /* Do not call the python hook on an explicit prompt change as |
370 | passed to this function, as this forms a secondary/local prompt, | |
371 | IE, displayed but not set. */ | |
372 | if (! new_prompt) | |
adf40b2e | 373 | { |
ab821bc6 | 374 | if (sync_execution) |
d17b6f81 | 375 | { |
ab821bc6 PA |
376 | /* This is to trick readline into not trying to display the |
377 | prompt. Even though we display the prompt using this | |
378 | function, readline still tries to do its own display if | |
379 | we don't call rl_callback_handler_install and | |
380 | rl_callback_handler_remove (which readline detects | |
381 | because a global variable is not set). If readline did | |
382 | that, it could mess up gdb signal handlers for SIGINT. | |
383 | Readline assumes that between calls to rl_set_signals and | |
384 | rl_clear_signals gdb doesn't do anything with the signal | |
385 | handlers. Well, that's not the case, because when the | |
386 | target executes we change the SIGINT signal handler. If | |
387 | we allowed readline to display the prompt, the signal | |
388 | handler change would happen exactly between the calls to | |
389 | the above two functions. Calling | |
390 | rl_callback_handler_remove(), does the job. */ | |
391 | ||
d3d4baed | 392 | gdb_rl_callback_handler_remove (); |
faab9922 | 393 | do_cleanups (old_chain); |
ab821bc6 | 394 | return; |
d17b6f81 PM |
395 | } |
396 | else | |
ab821bc6 PA |
397 | { |
398 | /* Display the top level prompt. */ | |
399 | actual_gdb_prompt = top_level_prompt (); | |
400 | } | |
b5a0ac70 | 401 | } |
ab821bc6 PA |
402 | else |
403 | actual_gdb_prompt = xstrdup (new_prompt); | |
b5a0ac70 SS |
404 | |
405 | if (async_command_editing_p) | |
406 | { | |
d3d4baed PA |
407 | gdb_rl_callback_handler_remove (); |
408 | gdb_rl_callback_handler_install (actual_gdb_prompt); | |
b5a0ac70 | 409 | } |
371d5dec | 410 | /* new_prompt at this point can be the top of the stack or the one |
d014929c MS |
411 | passed in. It can't be NULL. */ |
412 | else | |
b5a0ac70 SS |
413 | { |
414 | /* Don't use a _filtered function here. It causes the assumed | |
415 | character position to be off, since the newline we read from | |
416 | the user is not accounted for. */ | |
d17b6f81 | 417 | fputs_unfiltered (actual_gdb_prompt, gdb_stdout); |
b5a0ac70 SS |
418 | gdb_flush (gdb_stdout); |
419 | } | |
ab821bc6 PA |
420 | |
421 | do_cleanups (old_chain); | |
b5a0ac70 SS |
422 | } |
423 | ||
ab821bc6 PA |
424 | /* Return the top level prompt, as specified by "set prompt", possibly |
425 | overriden by the python gdb.prompt_hook hook, and then composed | |
426 | with the prompt prefix and suffix (annotations). The caller is | |
427 | responsible for freeing the returned string. */ | |
428 | ||
429 | static char * | |
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. */ | |
436 | observer_notify_before_prompt (get_prompt ()); | |
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 | |
b36cec19 | 449 | return concat (prefix, prompt, suffix, (char *) NULL); |
608ff013 | 450 | } |
ab821bc6 | 451 | |
608ff013 | 452 | return xstrdup (prompt); |
b5a0ac70 | 453 | } |
c2c6d25f | 454 | |
b69d38af PA |
455 | /* Get a pointer to the command line buffer. This is used to |
456 | construct a whole line of input from partial input. */ | |
457 | ||
458 | static struct buffer * | |
459 | get_command_line_buffer (void) | |
460 | { | |
461 | static struct buffer line_buffer; | |
462 | static int line_buffer_initialized; | |
463 | ||
464 | if (!line_buffer_initialized) | |
465 | { | |
466 | buffer_init (&line_buffer); | |
467 | line_buffer_initialized = 1; | |
468 | } | |
469 | ||
470 | return &line_buffer; | |
471 | } | |
472 | ||
187212b3 | 473 | /* When there is an event ready on the stdin file descriptor, instead |
c2c6d25f | 474 | of calling readline directly throught the callback function, or |
c70061cf PA |
475 | instead of calling gdb_readline_no_editing_callback, give gdb a |
476 | chance to detect errors and do something. */ | |
477 | ||
c2c6d25f | 478 | void |
2acceee2 | 479 | stdin_event_handler (int error, gdb_client_data client_data) |
c2c6d25f JM |
480 | { |
481 | if (error) | |
482 | { | |
a3f17187 | 483 | printf_unfiltered (_("error detected on stdin\n")); |
2acceee2 | 484 | delete_file_handler (input_fd); |
371d5dec | 485 | /* If stdin died, we may as well kill gdb. */ |
c5394b80 | 486 | quit_command ((char *) 0, stdin == instream); |
c2c6d25f JM |
487 | } |
488 | else | |
d64e57fa | 489 | { |
d2acc30b PA |
490 | /* This makes sure a ^C immediately followed by further input is |
491 | always processed in that order. E.g,. with input like | |
492 | "^Cprint 1\n", the SIGINT handler runs, marks the async signal | |
493 | handler, and then select/poll may return with stdin ready, | |
494 | instead of -1/EINTR. The | |
495 | gdb.base/double-prompt-target-event-error.exp test exercises | |
496 | this. */ | |
497 | QUIT; | |
498 | ||
d64e57fa PP |
499 | do |
500 | { | |
501 | call_stdin_event_handler_again_p = 0; | |
502 | (*call_readline) (client_data); | |
503 | } while (call_stdin_event_handler_again_p != 0); | |
504 | } | |
c2c6d25f JM |
505 | } |
506 | ||
6426a772 JM |
507 | /* Re-enable stdin after the end of an execution command in |
508 | synchronous mode, or after an error from the target, and we aborted | |
371d5dec | 509 | the exec operation. */ |
6426a772 JM |
510 | |
511 | void | |
712af3be | 512 | async_enable_stdin (void) |
6426a772 | 513 | { |
32c1e744 VP |
514 | if (sync_execution) |
515 | { | |
371d5dec | 516 | /* See NOTE in async_disable_stdin(). */ |
32c1e744 VP |
517 | /* FIXME: cagney/1999-09-27: Call this before clearing |
518 | sync_execution. Current target_terminal_ours() implementations | |
371d5dec | 519 | check for sync_execution before switching the terminal. */ |
32c1e744 | 520 | target_terminal_ours (); |
32c1e744 VP |
521 | sync_execution = 0; |
522 | } | |
6426a772 JM |
523 | } |
524 | ||
525 | /* Disable reads from stdin (the console) marking the command as | |
371d5dec | 526 | synchronous. */ |
6426a772 JM |
527 | |
528 | void | |
529 | async_disable_stdin (void) | |
530 | { | |
ab821bc6 | 531 | sync_execution = 1; |
6426a772 | 532 | } |
b5a0ac70 | 533 | \f |
6426a772 | 534 | |
b69d38af PA |
535 | /* Handle a gdb command line. This function is called when |
536 | handle_line_of_input has concatenated one or more input lines into | |
537 | a whole command. */ | |
538 | ||
539 | void | |
c2c6d25f | 540 | command_handler (char *command) |
b5a0ac70 | 541 | { |
0f3bb72e | 542 | struct cleanup *stat_chain; |
b69d38af | 543 | char *c; |
b5a0ac70 | 544 | |
bc008695 | 545 | if (instream == stdin) |
b5a0ac70 | 546 | reinitialize_more_filter (); |
b5a0ac70 | 547 | |
0f3bb72e | 548 | stat_chain = make_command_stats_cleanup (1); |
b5a0ac70 | 549 | |
b69d38af PA |
550 | /* Do not execute commented lines. */ |
551 | for (c = command; *c == ' ' || *c == '\t'; c++) | |
552 | ; | |
553 | if (c[0] != '#') | |
554 | { | |
555 | execute_command (command, instream == stdin); | |
c5aa993b | 556 | |
b69d38af PA |
557 | /* Do any commands attached to breakpoint we stopped at. */ |
558 | bpstat_do_actions (); | |
559 | } | |
c5aa993b | 560 | |
0f3bb72e | 561 | do_cleanups (stat_chain); |
43ff13b4 JM |
562 | } |
563 | ||
b69d38af PA |
564 | /* Append RL, an input line returned by readline or one of its |
565 | emulations, to CMD_LINE_BUFFER. Returns the command line if we | |
566 | have a whole command line ready to be processed by the command | |
567 | interpreter or NULL if the command line isn't complete yet (input | |
568 | line ends in a backslash). Takes ownership of RL. */ | |
b5a0ac70 | 569 | |
b69d38af PA |
570 | static char * |
571 | command_line_append_input_line (struct buffer *cmd_line_buffer, char *rl) | |
b5a0ac70 | 572 | { |
b69d38af PA |
573 | char *cmd; |
574 | size_t len; | |
b5a0ac70 | 575 | |
b69d38af | 576 | len = strlen (rl); |
b5a0ac70 | 577 | |
b69d38af | 578 | if (len > 0 && rl[len - 1] == '\\') |
b5a0ac70 | 579 | { |
b69d38af PA |
580 | /* Don't copy the backslash and wait for more. */ |
581 | buffer_grow (cmd_line_buffer, rl, len - 1); | |
582 | cmd = NULL; | |
b5a0ac70 | 583 | } |
b69d38af | 584 | else |
b5a0ac70 | 585 | { |
b69d38af PA |
586 | /* Copy whole line including terminating null, and we're |
587 | done. */ | |
588 | buffer_grow (cmd_line_buffer, rl, len + 1); | |
589 | cmd = cmd_line_buffer->buffer; | |
b5a0ac70 SS |
590 | } |
591 | ||
b69d38af PA |
592 | /* Allocated in readline. */ |
593 | xfree (rl); | |
b5a0ac70 | 594 | |
b69d38af PA |
595 | return cmd; |
596 | } | |
b5a0ac70 | 597 | |
b69d38af | 598 | /* Handle a line of input coming from readline. |
b5a0ac70 | 599 | |
b69d38af PA |
600 | If the read line ends with a continuation character (backslash), |
601 | save the partial input in CMD_LINE_BUFFER (except the backslash), | |
602 | and return NULL. Otherwise, save the partial input and return a | |
603 | pointer to CMD_LINE_BUFFER's buffer (null terminated), indicating a | |
604 | whole command line is ready to be executed. | |
b5a0ac70 | 605 | |
b69d38af | 606 | Returns EOF on end of file. |
b5a0ac70 | 607 | |
b69d38af | 608 | If REPEAT, handle command repetitions: |
b5a0ac70 | 609 | |
b69d38af PA |
610 | - If the input command line is NOT empty, the command returned is |
611 | copied into the global 'saved_command_line' var so that it can | |
612 | be repeated later. | |
d96429cd | 613 | |
b69d38af PA |
614 | - OTOH, if the input command line IS empty, return the previously |
615 | saved command instead of the empty input line. | |
616 | */ | |
b5a0ac70 | 617 | |
b69d38af PA |
618 | char * |
619 | handle_line_of_input (struct buffer *cmd_line_buffer, | |
620 | char *rl, int repeat, char *annotation_suffix) | |
621 | { | |
622 | char *p1; | |
623 | char *cmd; | |
624 | ||
625 | if (rl == NULL) | |
626 | return (char *) EOF; | |
627 | ||
628 | cmd = command_line_append_input_line (cmd_line_buffer, rl); | |
629 | if (cmd == NULL) | |
630 | return NULL; | |
b5a0ac70 | 631 | |
b69d38af PA |
632 | /* We have a complete command line now. Prepare for the next |
633 | command, but leave ownership of memory to the buffer . */ | |
634 | cmd_line_buffer->used_size = 0; | |
635 | ||
636 | if (annotation_level > 1 && instream == stdin) | |
b5a0ac70 | 637 | { |
b69d38af PA |
638 | printf_unfiltered (("\n\032\032post-")); |
639 | puts_unfiltered (annotation_suffix); | |
640 | printf_unfiltered (("\n")); | |
641 | } | |
642 | ||
643 | #define SERVER_COMMAND_PREFIX "server " | |
644 | if (startswith (cmd, SERVER_COMMAND_PREFIX)) | |
645 | { | |
646 | /* Note that we don't set `saved_command_line'. Between this | |
647 | and the check in dont_repeat, this insures that repeating | |
648 | will still do the right thing. */ | |
649 | return cmd + strlen (SERVER_COMMAND_PREFIX); | |
b5a0ac70 SS |
650 | } |
651 | ||
652 | /* Do history expansion if that is wished. */ | |
653 | if (history_expansion_p && instream == stdin | |
654 | && ISATTY (instream)) | |
655 | { | |
656 | char *history_value; | |
657 | int expanded; | |
658 | ||
b69d38af | 659 | expanded = history_expand (cmd, &history_value); |
b5a0ac70 SS |
660 | if (expanded) |
661 | { | |
b69d38af PA |
662 | size_t len; |
663 | ||
b5a0ac70 SS |
664 | /* Print the changes. */ |
665 | printf_unfiltered ("%s\n", history_value); | |
666 | ||
667 | /* If there was an error, call this function again. */ | |
668 | if (expanded < 0) | |
669 | { | |
b8c9b27d | 670 | xfree (history_value); |
b69d38af | 671 | return cmd; |
b5a0ac70 | 672 | } |
b69d38af PA |
673 | |
674 | /* history_expand returns an allocated string. Just replace | |
675 | our buffer with it. */ | |
676 | len = strlen (history_value); | |
677 | xfree (buffer_finish (cmd_line_buffer)); | |
678 | cmd_line_buffer->buffer = history_value; | |
679 | cmd_line_buffer->buffer_size = len + 1; | |
680 | cmd = history_value; | |
b5a0ac70 SS |
681 | } |
682 | } | |
683 | ||
371d5dec | 684 | /* If we just got an empty line, and that is supposed to repeat the |
b69d38af PA |
685 | previous command, return the previously saved command. */ |
686 | for (p1 = cmd; *p1 == ' ' || *p1 == '\t'; p1++) | |
687 | ; | |
688 | if (repeat && *p1 == '\0') | |
689 | return saved_command_line; | |
690 | ||
691 | /* Add command to history if appropriate. Note: lines consisting | |
692 | solely of comments are also added to the command history. This | |
693 | is useful when you type a command, and then realize you don't | |
694 | want to execute it quite yet. You can comment out the command | |
695 | and then later fetch it from the value history and remove the | |
696 | '#'. The kill ring is probably better, but some people are in | |
697 | the habit of commenting things out. */ | |
698 | if (*cmd != '\0' && input_from_terminal_p ()) | |
699 | gdb_add_history (cmd); | |
b5a0ac70 | 700 | |
b69d38af PA |
701 | /* Save into global buffer if appropriate. */ |
702 | if (repeat) | |
b5a0ac70 | 703 | { |
b69d38af PA |
704 | xfree (saved_command_line); |
705 | saved_command_line = xstrdup (cmd); | |
706 | return saved_command_line; | |
b5a0ac70 | 707 | } |
b69d38af PA |
708 | else |
709 | return cmd; | |
710 | } | |
b5a0ac70 | 711 | |
b69d38af PA |
712 | /* Handle a complete line of input. This is called by the callback |
713 | mechanism within the readline library. Deal with incomplete | |
714 | commands as well, by saving the partial input in a global | |
715 | buffer. | |
b5a0ac70 | 716 | |
b69d38af PA |
717 | NOTE: This is the asynchronous version of the command_line_input |
718 | function. */ | |
b5a0ac70 | 719 | |
b69d38af PA |
720 | void |
721 | command_line_handler (char *rl) | |
722 | { | |
723 | struct buffer *line_buffer = get_command_line_buffer (); | |
724 | char *cmd; | |
b5a0ac70 | 725 | |
b69d38af PA |
726 | cmd = handle_line_of_input (line_buffer, rl, instream == stdin, "prompt"); |
727 | if (cmd == (char *) EOF) | |
b5a0ac70 | 728 | { |
b69d38af PA |
729 | /* stdin closed. The connection with the terminal is gone. |
730 | This happens at the end of a testsuite run, after Expect has | |
731 | hung up but GDB is still alive. In such a case, we just quit | |
732 | gdb killing the inferior program too. */ | |
733 | printf_unfiltered ("quit\n"); | |
734 | execute_command ("quit", stdin == instream); | |
735 | } | |
736 | else if (cmd == NULL) | |
737 | { | |
738 | /* We don't have a full line yet. Print an empty prompt. */ | |
739 | display_gdb_prompt (""); | |
740 | } | |
741 | else | |
742 | { | |
743 | command_handler (cmd); | |
744 | display_gdb_prompt (0); | |
b5a0ac70 | 745 | } |
b5a0ac70 SS |
746 | } |
747 | ||
748 | /* Does reading of input from terminal w/o the editing features | |
c70061cf PA |
749 | provided by the readline library. Calls the line input handler |
750 | once we have a whole input line. */ | |
b5a0ac70 | 751 | |
085dd6e6 | 752 | void |
c70061cf | 753 | gdb_readline_no_editing_callback (gdb_client_data client_data) |
b5a0ac70 SS |
754 | { |
755 | int c; | |
756 | char *result; | |
187212b3 | 757 | struct buffer line_buffer; |
7be570e7 JM |
758 | static int done_once = 0; |
759 | ||
187212b3 PA |
760 | buffer_init (&line_buffer); |
761 | ||
7be570e7 | 762 | /* Unbuffer the input stream, so that, later on, the calls to fgetc |
371d5dec | 763 | fetch only one char at the time from the stream. The fgetc's will |
7be570e7 | 764 | get up to the first newline, but there may be more chars in the |
371d5dec | 765 | stream after '\n'. If we buffer the input and fgetc drains the |
7be570e7 | 766 | stream, getting stuff beyond the newline as well, a select, done |
371d5dec | 767 | afterwards will not trigger. */ |
7be570e7 JM |
768 | if (!done_once && !ISATTY (instream)) |
769 | { | |
770 | setbuf (instream, NULL); | |
771 | done_once = 1; | |
772 | } | |
b5a0ac70 | 773 | |
b5a0ac70 | 774 | /* We still need the while loop here, even though it would seem |
c70061cf PA |
775 | obvious to invoke gdb_readline_no_editing_callback at every |
776 | character entered. If not using the readline library, the | |
777 | terminal is in cooked mode, which sends the characters all at | |
778 | once. Poll will notice that the input fd has changed state only | |
779 | after enter is pressed. At this point we still need to fetch all | |
780 | the chars entered. */ | |
b5a0ac70 SS |
781 | |
782 | while (1) | |
783 | { | |
784 | /* Read from stdin if we are executing a user defined command. | |
785 | This is the right thing for prompt_for_continue, at least. */ | |
786 | c = fgetc (instream ? instream : stdin); | |
787 | ||
788 | if (c == EOF) | |
789 | { | |
187212b3 PA |
790 | if (line_buffer.used_size > 0) |
791 | { | |
792 | /* The last line does not end with a newline. Return it, and | |
793 | if we are called again fgetc will still return EOF and | |
794 | we'll return NULL then. */ | |
795 | break; | |
796 | } | |
797 | xfree (buffer_finish (&line_buffer)); | |
0f71a2f6 | 798 | (*input_handler) (0); |
13ce7133 | 799 | return; |
b5a0ac70 SS |
800 | } |
801 | ||
802 | if (c == '\n') | |
b5a0ac70 | 803 | { |
187212b3 PA |
804 | if (line_buffer.used_size > 0 |
805 | && line_buffer.buffer[line_buffer.used_size - 1] == '\r') | |
806 | line_buffer.used_size--; | |
b5a0ac70 SS |
807 | break; |
808 | } | |
b5a0ac70 | 809 | |
187212b3 | 810 | buffer_grow_char (&line_buffer, c); |
b5a0ac70 SS |
811 | } |
812 | ||
187212b3 PA |
813 | buffer_grow_char (&line_buffer, '\0'); |
814 | result = buffer_finish (&line_buffer); | |
0f71a2f6 | 815 | (*input_handler) (result); |
b5a0ac70 SS |
816 | } |
817 | \f | |
818 | ||
f0881b37 PA |
819 | /* The serial event associated with the QUIT flag. set_quit_flag sets |
820 | this, and check_quit_flag clears it. Used by interruptible_select | |
821 | to be able to do interruptible I/O with no race with the SIGINT | |
822 | handler. */ | |
823 | static struct serial_event *quit_serial_event; | |
824 | ||
b5a0ac70 | 825 | /* Initialization of signal handlers and tokens. There is a function |
371d5dec | 826 | handle_sig* for each of the signals GDB cares about. Specifically: |
b5a0ac70 SS |
827 | SIGINT, SIGFPE, SIGQUIT, SIGTSTP, SIGHUP, SIGWINCH. These |
828 | functions are the actual signal handlers associated to the signals | |
829 | via calls to signal(). The only job for these functions is to | |
830 | enqueue the appropriate event/procedure with the event loop. Such | |
371d5dec | 831 | procedures are the old signal handlers. The event loop will take |
b5a0ac70 | 832 | care of invoking the queued procedures to perform the usual tasks |
371d5dec | 833 | associated with the reception of the signal. */ |
392a587b | 834 | /* NOTE: 1999-04-30 This is the asynchronous version of init_signals. |
b5a0ac70 | 835 | init_signals will become obsolete as we move to have to event loop |
371d5dec | 836 | as the default for gdb. */ |
b5a0ac70 | 837 | void |
c2c6d25f | 838 | async_init_signals (void) |
c5aa993b | 839 | { |
5cc3ce8b PA |
840 | initialize_async_signal_handlers (); |
841 | ||
f0881b37 PA |
842 | quit_serial_event = make_serial_event (); |
843 | ||
b5a0ac70 SS |
844 | signal (SIGINT, handle_sigint); |
845 | sigint_token = | |
0f71a2f6 | 846 | create_async_signal_handler (async_request_quit, NULL); |
a7266fef | 847 | signal (SIGTERM, handle_sigterm); |
06c868a8 JK |
848 | async_sigterm_token |
849 | = create_async_signal_handler (async_sigterm_handler, NULL); | |
b5a0ac70 SS |
850 | |
851 | /* If SIGTRAP was set to SIG_IGN, then the SIG_IGN will get passed | |
852 | to the inferior and breakpoints will be ignored. */ | |
853 | #ifdef SIGTRAP | |
854 | signal (SIGTRAP, SIG_DFL); | |
855 | #endif | |
856 | ||
6d318c73 | 857 | #ifdef SIGQUIT |
b5a0ac70 SS |
858 | /* If we initialize SIGQUIT to SIG_IGN, then the SIG_IGN will get |
859 | passed to the inferior, which we don't want. It would be | |
860 | possible to do a "signal (SIGQUIT, SIG_DFL)" after we fork, but | |
861 | on BSD4.3 systems using vfork, that can affect the | |
862 | GDB process as well as the inferior (the signal handling tables | |
863 | might be in memory, shared between the two). Since we establish | |
864 | a handler for SIGQUIT, when we call exec it will set the signal | |
865 | to SIG_DFL for us. */ | |
866 | signal (SIGQUIT, handle_sigquit); | |
867 | sigquit_token = | |
0f71a2f6 | 868 | create_async_signal_handler (async_do_nothing, NULL); |
6d318c73 | 869 | #endif |
b5a0ac70 SS |
870 | #ifdef SIGHUP |
871 | if (signal (SIGHUP, handle_sighup) != SIG_IGN) | |
872 | sighup_token = | |
0f71a2f6 | 873 | create_async_signal_handler (async_disconnect, NULL); |
b5a0ac70 SS |
874 | else |
875 | sighup_token = | |
0f71a2f6 | 876 | create_async_signal_handler (async_do_nothing, NULL); |
b5a0ac70 SS |
877 | #endif |
878 | signal (SIGFPE, handle_sigfpe); | |
879 | sigfpe_token = | |
0f71a2f6 | 880 | create_async_signal_handler (async_float_handler, NULL); |
b5a0ac70 | 881 | |
0f71a2f6 JM |
882 | #ifdef STOP_SIGNAL |
883 | sigtstp_token = | |
884 | create_async_signal_handler (async_stop_sig, NULL); | |
885 | #endif | |
0f71a2f6 JM |
886 | } |
887 | ||
f0881b37 PA |
888 | /* See defs.h. */ |
889 | ||
890 | void | |
891 | quit_serial_event_set (void) | |
892 | { | |
893 | serial_event_set (quit_serial_event); | |
894 | } | |
895 | ||
896 | /* See defs.h. */ | |
897 | ||
898 | void | |
899 | quit_serial_event_clear (void) | |
900 | { | |
901 | serial_event_clear (quit_serial_event); | |
902 | } | |
903 | ||
904 | /* Return the selectable file descriptor of the serial event | |
905 | associated with the quit flag. */ | |
906 | ||
907 | static int | |
908 | quit_serial_event_fd (void) | |
909 | { | |
910 | return serial_event_fd (quit_serial_event); | |
911 | } | |
912 | ||
048094ac PA |
913 | /* See defs.h. */ |
914 | ||
915 | void | |
916 | default_quit_handler (void) | |
917 | { | |
918 | if (check_quit_flag ()) | |
919 | { | |
920 | if (target_terminal_is_ours ()) | |
921 | quit (); | |
922 | else | |
923 | target_pass_ctrlc (); | |
924 | } | |
925 | } | |
926 | ||
927 | /* See defs.h. */ | |
928 | quit_handler_ftype *quit_handler = default_quit_handler; | |
929 | ||
930 | /* Data for make_cleanup_override_quit_handler. Wrap the previous | |
931 | handler pointer in a data struct because it's not portable to cast | |
932 | a function pointer to a data pointer, which is what make_cleanup | |
933 | expects. */ | |
934 | struct quit_handler_cleanup_data | |
935 | { | |
936 | /* The previous quit handler. */ | |
937 | quit_handler_ftype *prev_handler; | |
938 | }; | |
939 | ||
940 | /* Cleanup call that restores the previous quit handler. */ | |
941 | ||
942 | static void | |
943 | restore_quit_handler (void *arg) | |
944 | { | |
945 | struct quit_handler_cleanup_data *data | |
946 | = (struct quit_handler_cleanup_data *) arg; | |
947 | ||
948 | quit_handler = data->prev_handler; | |
949 | } | |
950 | ||
951 | /* Destructor for the quit handler cleanup. */ | |
952 | ||
953 | static void | |
954 | restore_quit_handler_dtor (void *arg) | |
955 | { | |
956 | xfree (arg); | |
957 | } | |
958 | ||
959 | /* See defs.h. */ | |
960 | ||
961 | struct cleanup * | |
962 | make_cleanup_override_quit_handler (quit_handler_ftype *new_quit_handler) | |
963 | { | |
964 | struct cleanup *old_chain; | |
965 | struct quit_handler_cleanup_data *data; | |
966 | ||
967 | data = XNEW (struct quit_handler_cleanup_data); | |
968 | data->prev_handler = quit_handler; | |
969 | old_chain = make_cleanup_dtor (restore_quit_handler, data, | |
970 | restore_quit_handler_dtor); | |
971 | quit_handler = new_quit_handler; | |
972 | return old_chain; | |
973 | } | |
974 | ||
f0881b37 PA |
975 | /* Handle a SIGINT. */ |
976 | ||
c5aa993b | 977 | void |
c2c6d25f | 978 | handle_sigint (int sig) |
b5a0ac70 SS |
979 | { |
980 | signal (sig, handle_sigint); | |
981 | ||
5f960e00 FF |
982 | /* We could be running in a loop reading in symfiles or something so |
983 | it may be quite a while before we get back to the event loop. So | |
371d5dec | 984 | set quit_flag to 1 here. Then if QUIT is called before we get to |
5f960e00 | 985 | the event loop, we will unwind as expected. */ |
522002f9 | 986 | set_quit_flag (); |
5f960e00 | 987 | |
585a46a2 PA |
988 | /* In case nothing calls QUIT before the event loop is reached, the |
989 | event loop handles it. */ | |
990 | mark_async_signal_handler (sigint_token); | |
b5a0ac70 SS |
991 | } |
992 | ||
f0881b37 PA |
993 | /* See gdb_select.h. */ |
994 | ||
995 | int | |
996 | interruptible_select (int n, | |
997 | fd_set *readfds, fd_set *writefds, fd_set *exceptfds, | |
998 | struct timeval *timeout) | |
999 | { | |
1000 | fd_set my_readfds; | |
1001 | int fd; | |
1002 | int res; | |
1003 | ||
1004 | if (readfds == NULL) | |
1005 | { | |
1006 | readfds = &my_readfds; | |
1007 | FD_ZERO (&my_readfds); | |
1008 | } | |
1009 | ||
1010 | fd = quit_serial_event_fd (); | |
1011 | FD_SET (fd, readfds); | |
1012 | if (n <= fd) | |
1013 | n = fd + 1; | |
1014 | ||
1015 | do | |
1016 | { | |
1017 | res = gdb_select (n, readfds, writefds, exceptfds, timeout); | |
1018 | } | |
1019 | while (res == -1 && errno == EINTR); | |
1020 | ||
1021 | if (res == 1 && FD_ISSET (fd, readfds)) | |
1022 | { | |
1023 | errno = EINTR; | |
1024 | return -1; | |
1025 | } | |
1026 | return res; | |
1027 | } | |
1028 | ||
06c868a8 JK |
1029 | /* Handle GDB exit upon receiving SIGTERM if target_can_async_p (). */ |
1030 | ||
1031 | static void | |
1032 | async_sigterm_handler (gdb_client_data arg) | |
1033 | { | |
1034 | quit_force (NULL, stdin == instream); | |
1035 | } | |
1036 | ||
1037 | /* See defs.h. */ | |
1038 | volatile int sync_quit_force_run; | |
1039 | ||
a7266fef AS |
1040 | /* Quit GDB if SIGTERM is received. |
1041 | GDB would quit anyway, but this way it will clean up properly. */ | |
1042 | void | |
1043 | handle_sigterm (int sig) | |
1044 | { | |
1045 | signal (sig, handle_sigterm); | |
06c868a8 | 1046 | |
077836f7 PP |
1047 | sync_quit_force_run = 1; |
1048 | set_quit_flag (); | |
1049 | ||
1050 | mark_async_signal_handler (async_sigterm_token); | |
a7266fef AS |
1051 | } |
1052 | ||
371d5dec | 1053 | /* Do the quit. All the checks have been done by the caller. */ |
c5aa993b | 1054 | void |
c2c6d25f | 1055 | async_request_quit (gdb_client_data arg) |
b5a0ac70 | 1056 | { |
5f960e00 | 1057 | /* If the quit_flag has gotten reset back to 0 by the time we get |
4ac94eda FF |
1058 | back here, that means that an exception was thrown to unwind the |
1059 | current command before we got back to the event loop. So there | |
522002f9 | 1060 | is no reason to call quit again here. */ |
048094ac | 1061 | QUIT; |
b5a0ac70 SS |
1062 | } |
1063 | ||
6d318c73 | 1064 | #ifdef SIGQUIT |
371d5dec MS |
1065 | /* Tell the event loop what to do if SIGQUIT is received. |
1066 | See event-signal.c. */ | |
c5aa993b | 1067 | static void |
c2c6d25f | 1068 | handle_sigquit (int sig) |
b5a0ac70 | 1069 | { |
f6fbab7d | 1070 | mark_async_signal_handler (sigquit_token); |
b5a0ac70 SS |
1071 | signal (sig, handle_sigquit); |
1072 | } | |
6d318c73 | 1073 | #endif |
b5a0ac70 | 1074 | |
0f0b8dcd DJ |
1075 | #if defined (SIGQUIT) || defined (SIGHUP) |
1076 | /* Called by the event loop in response to a SIGQUIT or an | |
1077 | ignored SIGHUP. */ | |
c5aa993b | 1078 | static void |
c2c6d25f | 1079 | async_do_nothing (gdb_client_data arg) |
b5a0ac70 | 1080 | { |
371d5dec | 1081 | /* Empty function body. */ |
b5a0ac70 | 1082 | } |
0f0b8dcd | 1083 | #endif |
b5a0ac70 SS |
1084 | |
1085 | #ifdef SIGHUP | |
371d5dec MS |
1086 | /* Tell the event loop what to do if SIGHUP is received. |
1087 | See event-signal.c. */ | |
c5aa993b | 1088 | static void |
fba45db2 | 1089 | handle_sighup (int sig) |
b5a0ac70 | 1090 | { |
f6fbab7d | 1091 | mark_async_signal_handler (sighup_token); |
b5a0ac70 SS |
1092 | signal (sig, handle_sighup); |
1093 | } | |
1094 | ||
371d5dec | 1095 | /* Called by the event loop to process a SIGHUP. */ |
c5aa993b | 1096 | static void |
c2c6d25f | 1097 | async_disconnect (gdb_client_data arg) |
b5a0ac70 | 1098 | { |
b2cd6b29 | 1099 | |
492d29ea | 1100 | TRY |
b2cd6b29 JM |
1101 | { |
1102 | quit_cover (); | |
1103 | } | |
1104 | ||
492d29ea | 1105 | CATCH (exception, RETURN_MASK_ALL) |
b2cd6b29 JM |
1106 | { |
1107 | fputs_filtered ("Could not kill the program being debugged", | |
1108 | gdb_stderr); | |
1109 | exception_print (gdb_stderr, exception); | |
1110 | } | |
492d29ea | 1111 | END_CATCH |
b2cd6b29 | 1112 | |
492d29ea | 1113 | TRY |
b2cd6b29 | 1114 | { |
460014f5 | 1115 | pop_all_targets (); |
b2cd6b29 | 1116 | } |
492d29ea PA |
1117 | CATCH (exception, RETURN_MASK_ALL) |
1118 | { | |
1119 | } | |
1120 | END_CATCH | |
b2cd6b29 | 1121 | |
371d5dec | 1122 | signal (SIGHUP, SIG_DFL); /*FIXME: ??????????? */ |
ec4dfccf | 1123 | raise (SIGHUP); |
b5a0ac70 SS |
1124 | } |
1125 | #endif | |
1126 | ||
0f71a2f6 | 1127 | #ifdef STOP_SIGNAL |
c5aa993b | 1128 | void |
c2c6d25f | 1129 | handle_stop_sig (int sig) |
0f71a2f6 | 1130 | { |
f6fbab7d | 1131 | mark_async_signal_handler (sigtstp_token); |
c5aa993b | 1132 | signal (sig, handle_stop_sig); |
0f71a2f6 JM |
1133 | } |
1134 | ||
1135 | static void | |
c2c6d25f | 1136 | async_stop_sig (gdb_client_data arg) |
0f71a2f6 | 1137 | { |
ab821bc6 | 1138 | char *prompt = get_prompt (); |
d7f9d729 | 1139 | |
0f71a2f6 JM |
1140 | #if STOP_SIGNAL == SIGTSTP |
1141 | signal (SIGTSTP, SIG_DFL); | |
2acceee2 JM |
1142 | #if HAVE_SIGPROCMASK |
1143 | { | |
1144 | sigset_t zero; | |
46711df8 | 1145 | |
2acceee2 JM |
1146 | sigemptyset (&zero); |
1147 | sigprocmask (SIG_SETMASK, &zero, 0); | |
1148 | } | |
46711df8 | 1149 | #elif HAVE_SIGSETMASK |
0f71a2f6 | 1150 | sigsetmask (0); |
2acceee2 | 1151 | #endif |
ec4dfccf | 1152 | raise (SIGTSTP); |
0f71a2f6 JM |
1153 | signal (SIGTSTP, handle_stop_sig); |
1154 | #else | |
1155 | signal (STOP_SIGNAL, handle_stop_sig); | |
1156 | #endif | |
1157 | printf_unfiltered ("%s", prompt); | |
1158 | gdb_flush (gdb_stdout); | |
1159 | ||
371d5dec MS |
1160 | /* Forget about any previous command -- null line now will do |
1161 | nothing. */ | |
0f71a2f6 JM |
1162 | dont_repeat (); |
1163 | } | |
1164 | #endif /* STOP_SIGNAL */ | |
1165 | ||
371d5dec MS |
1166 | /* Tell the event loop what to do if SIGFPE is received. |
1167 | See event-signal.c. */ | |
c5aa993b | 1168 | static void |
c2c6d25f | 1169 | handle_sigfpe (int sig) |
b5a0ac70 | 1170 | { |
f6fbab7d | 1171 | mark_async_signal_handler (sigfpe_token); |
b5a0ac70 SS |
1172 | signal (sig, handle_sigfpe); |
1173 | } | |
1174 | ||
371d5dec | 1175 | /* Event loop will call this functin to process a SIGFPE. */ |
c5aa993b | 1176 | static void |
c2c6d25f | 1177 | async_float_handler (gdb_client_data arg) |
b5a0ac70 | 1178 | { |
371d5dec MS |
1179 | /* This message is based on ANSI C, section 4.7. Note that integer |
1180 | divide by zero causes this, so "float" is a misnomer. */ | |
8a3fe4f8 | 1181 | error (_("Erroneous arithmetic operation.")); |
b5a0ac70 | 1182 | } |
b5a0ac70 SS |
1183 | \f |
1184 | ||
1185 | /* Called by do_setshow_command. */ | |
b5a0ac70 | 1186 | void |
371d5dec MS |
1187 | set_async_editing_command (char *args, int from_tty, |
1188 | struct cmd_list_element *c) | |
b5a0ac70 SS |
1189 | { |
1190 | change_line_handler (); | |
1191 | } | |
1192 | ||
0f71a2f6 | 1193 | /* Set things up for readline to be invoked via the alternate |
3c610247 PA |
1194 | interface, i.e. via a callback function |
1195 | (gdb_rl_callback_read_char), and hook up instream to the event | |
1196 | loop. */ | |
1197 | ||
0f71a2f6 | 1198 | void |
cee6ddeb | 1199 | gdb_setup_readline (void) |
0f71a2f6 | 1200 | { |
362646f5 AC |
1201 | /* This function is a noop for the sync case. The assumption is |
1202 | that the sync setup is ALL done in gdb_init, and we would only | |
1203 | mess it up here. The sync stuff should really go away over | |
1204 | time. */ | |
1a088d06 AS |
1205 | if (!batch_silent) |
1206 | gdb_stdout = stdio_fileopen (stdout); | |
ffa4ac95 | 1207 | gdb_stderr = stderr_fileopen (); |
362646f5 AC |
1208 | gdb_stdlog = gdb_stderr; /* for moment */ |
1209 | gdb_stdtarg = gdb_stderr; /* for moment */ | |
8d4d924b | 1210 | gdb_stdtargerr = gdb_stderr; /* for moment */ |
362646f5 AC |
1211 | |
1212 | /* If the input stream is connected to a terminal, turn on | |
1213 | editing. */ | |
1214 | if (ISATTY (instream)) | |
9e0b60a8 | 1215 | { |
371d5dec | 1216 | /* Tell gdb that we will be using the readline library. This |
362646f5 AC |
1217 | could be overwritten by a command in .gdbinit like 'set |
1218 | editing on' or 'off'. */ | |
1219 | async_command_editing_p = 1; | |
c5201926 | 1220 | |
362646f5 AC |
1221 | /* When a character is detected on instream by select or poll, |
1222 | readline will be invoked via this callback function. */ | |
3c610247 | 1223 | call_readline = gdb_rl_callback_read_char_wrapper; |
9e0b60a8 | 1224 | } |
362646f5 AC |
1225 | else |
1226 | { | |
1227 | async_command_editing_p = 0; | |
c70061cf | 1228 | call_readline = gdb_readline_no_editing_callback; |
362646f5 AC |
1229 | } |
1230 | ||
1231 | /* When readline has read an end-of-line character, it passes the | |
371d5dec | 1232 | complete line to gdb for processing; command_line_handler is the |
362646f5 AC |
1233 | function that does this. */ |
1234 | input_handler = command_line_handler; | |
1235 | ||
371d5dec | 1236 | /* Tell readline to use the same input stream that gdb uses. */ |
362646f5 AC |
1237 | rl_instream = instream; |
1238 | ||
1239 | /* Get a file descriptor for the input stream, so that we can | |
1240 | register it with the event loop. */ | |
1241 | input_fd = fileno (instream); | |
1242 | ||
1243 | /* Now we need to create the event sources for the input file | |
1244 | descriptor. */ | |
1245 | /* At this point in time, this is the only event source that we | |
371d5dec | 1246 | register with the even loop. Another source is going to be the |
362646f5 AC |
1247 | target program (inferior), but that must be registered only when |
1248 | it actually exists (I.e. after we say 'run' or after we connect | |
1249 | to a remote target. */ | |
1250 | add_file_handler (input_fd, stdin_event_handler, 0); | |
0f71a2f6 | 1251 | } |
cee6ddeb | 1252 | |
7d5b6fdd EZ |
1253 | /* Disable command input through the standard CLI channels. Used in |
1254 | the suspend proc for interpreters that use the standard gdb readline | |
1255 | interface, like the cli & the mi. */ | |
1256 | void | |
1257 | gdb_disable_readline (void) | |
1258 | { | |
362646f5 AC |
1259 | /* FIXME - It is too heavyweight to delete and remake these every |
1260 | time you run an interpreter that needs readline. It is probably | |
1261 | better to have the interpreters cache these, which in turn means | |
1262 | that this needs to be moved into interpreter specific code. */ | |
7d5b6fdd EZ |
1263 | |
1264 | #if 0 | |
362646f5 AC |
1265 | ui_file_delete (gdb_stdout); |
1266 | ui_file_delete (gdb_stderr); | |
1267 | gdb_stdlog = NULL; | |
1268 | gdb_stdtarg = NULL; | |
8d4d924b | 1269 | gdb_stdtargerr = NULL; |
7d5b6fdd EZ |
1270 | #endif |
1271 | ||
d3d4baed | 1272 | gdb_rl_callback_handler_remove (); |
362646f5 | 1273 | delete_file_handler (input_fd); |
7d5b6fdd | 1274 | } |