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 | ||
371d5dec MS |
148 | /* Wrapper function for calling into the readline library. The event |
149 | loop expects the callback function to have a paramter, while | |
150 | readline expects none. */ | |
c2c6d25f | 151 | static void |
3c610247 | 152 | gdb_rl_callback_read_char_wrapper (gdb_client_data client_data) |
c2c6d25f JM |
153 | { |
154 | rl_callback_read_char (); | |
467d8519 TT |
155 | if (after_char_processing_hook) |
156 | (*after_char_processing_hook) (); | |
c2c6d25f JM |
157 | } |
158 | ||
b5a0ac70 | 159 | /* Initialize all the necessary variables, start the event loop, |
4d09c5b4 AB |
160 | register readline, and stdin, start the loop. The DATA is the |
161 | interpreter data cookie, ignored for now. */ | |
162 | ||
b5a0ac70 | 163 | void |
4d09c5b4 | 164 | cli_command_loop (void *data) |
b5a0ac70 | 165 | { |
7d8e6458 | 166 | display_gdb_prompt (0); |
b5a0ac70 | 167 | |
371d5dec | 168 | /* Now it's time to start the event loop. */ |
085dd6e6 | 169 | start_event_loop (); |
b5a0ac70 SS |
170 | } |
171 | ||
172 | /* Change the function to be invoked every time there is a character | |
371d5dec | 173 | ready on stdin. This is used when the user sets the editing off, |
b5a0ac70 | 174 | therefore bypassing readline, and letting gdb handle the input |
c70061cf PA |
175 | itself, via gdb_readline_no_editing_callback. Also it is used in |
176 | the opposite case in which the user sets editing on again, by | |
177 | restoring readline handling of the input. */ | |
392a587b | 178 | static void |
c2c6d25f | 179 | change_line_handler (void) |
b5a0ac70 | 180 | { |
371d5dec MS |
181 | /* NOTE: this operates on input_fd, not instream. If we are reading |
182 | commands from a file, instream will point to the file. However in | |
c2c6d25f | 183 | async mode, we always read commands from a file with editing |
371d5dec MS |
184 | off. This means that the 'set editing on/off' will have effect |
185 | only on the interactive session. */ | |
c2c6d25f | 186 | |
b5a0ac70 SS |
187 | if (async_command_editing_p) |
188 | { | |
371d5dec | 189 | /* Turn on editing by using readline. */ |
3c610247 | 190 | call_readline = gdb_rl_callback_read_char_wrapper; |
0f71a2f6 | 191 | input_handler = command_line_handler; |
b5a0ac70 SS |
192 | } |
193 | else | |
194 | { | |
c70061cf | 195 | /* Turn off editing by using gdb_readline_no_editing_callback. */ |
d3d4baed | 196 | gdb_rl_callback_handler_remove (); |
c70061cf | 197 | call_readline = gdb_readline_no_editing_callback; |
0f71a2f6 JM |
198 | |
199 | /* Set up the command handler as well, in case we are called as | |
371d5dec | 200 | first thing from .gdbinit. */ |
0f71a2f6 | 201 | input_handler = command_line_handler; |
b5a0ac70 | 202 | } |
b5a0ac70 SS |
203 | } |
204 | ||
d3d4baed PA |
205 | /* The functions below are wrappers for rl_callback_handler_remove and |
206 | rl_callback_handler_install that keep track of whether the callback | |
207 | handler is installed in readline. This is necessary because after | |
208 | handling a target event of a background execution command, we may | |
209 | need to reinstall the callback handler if it was removed due to a | |
210 | secondary prompt. See gdb_readline_wrapper_line. We don't | |
211 | unconditionally install the handler for every target event because | |
212 | that also clears the line buffer, thus installing it while the user | |
213 | is typing would lose input. */ | |
214 | ||
215 | /* Whether we've registered a callback handler with readline. */ | |
216 | static int callback_handler_installed; | |
217 | ||
218 | /* See event-top.h, and above. */ | |
219 | ||
220 | void | |
221 | gdb_rl_callback_handler_remove (void) | |
222 | { | |
223 | rl_callback_handler_remove (); | |
224 | callback_handler_installed = 0; | |
225 | } | |
226 | ||
227 | /* See event-top.h, and above. Note this wrapper doesn't have an | |
228 | actual callback parameter because we always install | |
229 | INPUT_HANDLER. */ | |
230 | ||
231 | void | |
232 | gdb_rl_callback_handler_install (const char *prompt) | |
233 | { | |
234 | /* Calling rl_callback_handler_install resets readline's input | |
235 | buffer. Calling this when we were already processing input | |
236 | therefore loses input. */ | |
237 | gdb_assert (!callback_handler_installed); | |
238 | ||
239 | rl_callback_handler_install (prompt, input_handler); | |
240 | callback_handler_installed = 1; | |
241 | } | |
242 | ||
243 | /* See event-top.h, and above. */ | |
244 | ||
245 | void | |
246 | gdb_rl_callback_handler_reinstall (void) | |
247 | { | |
248 | if (!callback_handler_installed) | |
249 | { | |
250 | /* Passing NULL as prompt argument tells readline to not display | |
251 | a prompt. */ | |
252 | gdb_rl_callback_handler_install (NULL); | |
253 | } | |
254 | } | |
255 | ||
ab821bc6 PA |
256 | /* Displays the prompt. If the argument NEW_PROMPT is NULL, the |
257 | prompt that is displayed is the current top level prompt. | |
258 | Otherwise, it displays whatever NEW_PROMPT is as a local/secondary | |
259 | prompt. | |
260 | ||
261 | This is used after each gdb command has completed, and in the | |
262 | following cases: | |
263 | ||
371d5dec | 264 | 1. When the user enters a command line which is ended by '\' |
ab821bc6 PA |
265 | indicating that the command will continue on the next line. In |
266 | that case the prompt that is displayed is the empty string. | |
267 | ||
0f71a2f6 | 268 | 2. When the user is entering 'commands' for a breakpoint, or |
371d5dec | 269 | actions for a tracepoint. In this case the prompt will be '>' |
ab821bc6 PA |
270 | |
271 | 3. On prompting for pagination. */ | |
272 | ||
b5a0ac70 | 273 | void |
38bcc89d | 274 | display_gdb_prompt (const char *new_prompt) |
b5a0ac70 | 275 | { |
d17b6f81 | 276 | char *actual_gdb_prompt = NULL; |
ab821bc6 | 277 | struct cleanup *old_chain; |
b5a0ac70 | 278 | |
bd00c694 PA |
279 | annotate_display_prompt (); |
280 | ||
16026cd7 AS |
281 | /* Reset the nesting depth used when trace-commands is set. */ |
282 | reset_command_nest_depth (); | |
283 | ||
ab821bc6 | 284 | old_chain = make_cleanup (free_current_contents, &actual_gdb_prompt); |
d17b6f81 | 285 | |
ab821bc6 PA |
286 | /* Do not call the python hook on an explicit prompt change as |
287 | passed to this function, as this forms a secondary/local prompt, | |
288 | IE, displayed but not set. */ | |
289 | if (! new_prompt) | |
adf40b2e | 290 | { |
ab821bc6 | 291 | if (sync_execution) |
d17b6f81 | 292 | { |
ab821bc6 PA |
293 | /* This is to trick readline into not trying to display the |
294 | prompt. Even though we display the prompt using this | |
295 | function, readline still tries to do its own display if | |
296 | we don't call rl_callback_handler_install and | |
297 | rl_callback_handler_remove (which readline detects | |
298 | because a global variable is not set). If readline did | |
299 | that, it could mess up gdb signal handlers for SIGINT. | |
300 | Readline assumes that between calls to rl_set_signals and | |
301 | rl_clear_signals gdb doesn't do anything with the signal | |
302 | handlers. Well, that's not the case, because when the | |
303 | target executes we change the SIGINT signal handler. If | |
304 | we allowed readline to display the prompt, the signal | |
305 | handler change would happen exactly between the calls to | |
306 | the above two functions. Calling | |
307 | rl_callback_handler_remove(), does the job. */ | |
308 | ||
d3d4baed | 309 | gdb_rl_callback_handler_remove (); |
faab9922 | 310 | do_cleanups (old_chain); |
ab821bc6 | 311 | return; |
d17b6f81 PM |
312 | } |
313 | else | |
ab821bc6 PA |
314 | { |
315 | /* Display the top level prompt. */ | |
316 | actual_gdb_prompt = top_level_prompt (); | |
317 | } | |
b5a0ac70 | 318 | } |
ab821bc6 PA |
319 | else |
320 | actual_gdb_prompt = xstrdup (new_prompt); | |
b5a0ac70 SS |
321 | |
322 | if (async_command_editing_p) | |
323 | { | |
d3d4baed PA |
324 | gdb_rl_callback_handler_remove (); |
325 | gdb_rl_callback_handler_install (actual_gdb_prompt); | |
b5a0ac70 | 326 | } |
371d5dec | 327 | /* new_prompt at this point can be the top of the stack or the one |
d014929c MS |
328 | passed in. It can't be NULL. */ |
329 | else | |
b5a0ac70 SS |
330 | { |
331 | /* Don't use a _filtered function here. It causes the assumed | |
332 | character position to be off, since the newline we read from | |
333 | the user is not accounted for. */ | |
d17b6f81 | 334 | fputs_unfiltered (actual_gdb_prompt, gdb_stdout); |
b5a0ac70 SS |
335 | gdb_flush (gdb_stdout); |
336 | } | |
ab821bc6 PA |
337 | |
338 | do_cleanups (old_chain); | |
b5a0ac70 SS |
339 | } |
340 | ||
ab821bc6 PA |
341 | /* Return the top level prompt, as specified by "set prompt", possibly |
342 | overriden by the python gdb.prompt_hook hook, and then composed | |
343 | with the prompt prefix and suffix (annotations). The caller is | |
344 | responsible for freeing the returned string. */ | |
345 | ||
346 | static char * | |
347 | top_level_prompt (void) | |
b5a0ac70 | 348 | { |
608ff013 | 349 | char *prompt; |
b5a0ac70 | 350 | |
ab821bc6 PA |
351 | /* Give observers a chance of changing the prompt. E.g., the python |
352 | `gdb.prompt_hook' is installed as an observer. */ | |
353 | observer_notify_before_prompt (get_prompt ()); | |
354 | ||
608ff013 | 355 | prompt = get_prompt (); |
b5a0ac70 | 356 | |
ab821bc6 | 357 | if (annotation_level >= 2) |
b5a0ac70 | 358 | { |
ab821bc6 | 359 | /* Prefix needs to have new line at end. */ |
608ff013 | 360 | const char prefix[] = "\n\032\032pre-prompt\n"; |
ab821bc6 PA |
361 | |
362 | /* Suffix needs to have a new line at end and \032 \032 at | |
363 | beginning. */ | |
608ff013 | 364 | const char suffix[] = "\n\032\032prompt\n"; |
b5a0ac70 | 365 | |
b36cec19 | 366 | return concat (prefix, prompt, suffix, (char *) NULL); |
608ff013 | 367 | } |
ab821bc6 | 368 | |
608ff013 | 369 | return xstrdup (prompt); |
b5a0ac70 | 370 | } |
c2c6d25f | 371 | |
b69d38af PA |
372 | /* Get a pointer to the command line buffer. This is used to |
373 | construct a whole line of input from partial input. */ | |
374 | ||
375 | static struct buffer * | |
376 | get_command_line_buffer (void) | |
377 | { | |
378 | static struct buffer line_buffer; | |
379 | static int line_buffer_initialized; | |
380 | ||
381 | if (!line_buffer_initialized) | |
382 | { | |
383 | buffer_init (&line_buffer); | |
384 | line_buffer_initialized = 1; | |
385 | } | |
386 | ||
387 | return &line_buffer; | |
388 | } | |
389 | ||
187212b3 | 390 | /* When there is an event ready on the stdin file descriptor, instead |
c2c6d25f | 391 | of calling readline directly throught the callback function, or |
c70061cf PA |
392 | instead of calling gdb_readline_no_editing_callback, give gdb a |
393 | chance to detect errors and do something. */ | |
394 | ||
c2c6d25f | 395 | void |
2acceee2 | 396 | stdin_event_handler (int error, gdb_client_data client_data) |
c2c6d25f JM |
397 | { |
398 | if (error) | |
399 | { | |
a3f17187 | 400 | printf_unfiltered (_("error detected on stdin\n")); |
2acceee2 | 401 | delete_file_handler (input_fd); |
371d5dec | 402 | /* If stdin died, we may as well kill gdb. */ |
c5394b80 | 403 | quit_command ((char *) 0, stdin == instream); |
c2c6d25f JM |
404 | } |
405 | else | |
d64e57fa | 406 | { |
d2acc30b PA |
407 | /* This makes sure a ^C immediately followed by further input is |
408 | always processed in that order. E.g,. with input like | |
409 | "^Cprint 1\n", the SIGINT handler runs, marks the async signal | |
410 | handler, and then select/poll may return with stdin ready, | |
411 | instead of -1/EINTR. The | |
412 | gdb.base/double-prompt-target-event-error.exp test exercises | |
413 | this. */ | |
414 | QUIT; | |
415 | ||
d64e57fa PP |
416 | do |
417 | { | |
418 | call_stdin_event_handler_again_p = 0; | |
419 | (*call_readline) (client_data); | |
420 | } while (call_stdin_event_handler_again_p != 0); | |
421 | } | |
c2c6d25f JM |
422 | } |
423 | ||
6426a772 JM |
424 | /* Re-enable stdin after the end of an execution command in |
425 | synchronous mode, or after an error from the target, and we aborted | |
371d5dec | 426 | the exec operation. */ |
6426a772 JM |
427 | |
428 | void | |
712af3be | 429 | async_enable_stdin (void) |
6426a772 | 430 | { |
32c1e744 VP |
431 | if (sync_execution) |
432 | { | |
371d5dec | 433 | /* See NOTE in async_disable_stdin(). */ |
32c1e744 VP |
434 | /* FIXME: cagney/1999-09-27: Call this before clearing |
435 | sync_execution. Current target_terminal_ours() implementations | |
371d5dec | 436 | check for sync_execution before switching the terminal. */ |
32c1e744 | 437 | target_terminal_ours (); |
32c1e744 VP |
438 | sync_execution = 0; |
439 | } | |
6426a772 JM |
440 | } |
441 | ||
442 | /* Disable reads from stdin (the console) marking the command as | |
371d5dec | 443 | synchronous. */ |
6426a772 JM |
444 | |
445 | void | |
446 | async_disable_stdin (void) | |
447 | { | |
ab821bc6 | 448 | sync_execution = 1; |
6426a772 | 449 | } |
b5a0ac70 | 450 | \f |
6426a772 | 451 | |
b69d38af PA |
452 | /* Handle a gdb command line. This function is called when |
453 | handle_line_of_input has concatenated one or more input lines into | |
454 | a whole command. */ | |
455 | ||
456 | void | |
c2c6d25f | 457 | command_handler (char *command) |
b5a0ac70 | 458 | { |
0f3bb72e | 459 | struct cleanup *stat_chain; |
b69d38af | 460 | char *c; |
b5a0ac70 | 461 | |
bc008695 | 462 | if (instream == stdin) |
b5a0ac70 | 463 | reinitialize_more_filter (); |
b5a0ac70 | 464 | |
0f3bb72e | 465 | stat_chain = make_command_stats_cleanup (1); |
b5a0ac70 | 466 | |
b69d38af PA |
467 | /* Do not execute commented lines. */ |
468 | for (c = command; *c == ' ' || *c == '\t'; c++) | |
469 | ; | |
470 | if (c[0] != '#') | |
471 | { | |
472 | execute_command (command, instream == stdin); | |
c5aa993b | 473 | |
b69d38af PA |
474 | /* Do any commands attached to breakpoint we stopped at. */ |
475 | bpstat_do_actions (); | |
476 | } | |
c5aa993b | 477 | |
0f3bb72e | 478 | do_cleanups (stat_chain); |
43ff13b4 JM |
479 | } |
480 | ||
b69d38af PA |
481 | /* Append RL, an input line returned by readline or one of its |
482 | emulations, to CMD_LINE_BUFFER. Returns the command line if we | |
483 | have a whole command line ready to be processed by the command | |
484 | interpreter or NULL if the command line isn't complete yet (input | |
485 | line ends in a backslash). Takes ownership of RL. */ | |
b5a0ac70 | 486 | |
b69d38af PA |
487 | static char * |
488 | command_line_append_input_line (struct buffer *cmd_line_buffer, char *rl) | |
b5a0ac70 | 489 | { |
b69d38af PA |
490 | char *cmd; |
491 | size_t len; | |
b5a0ac70 | 492 | |
b69d38af | 493 | len = strlen (rl); |
b5a0ac70 | 494 | |
b69d38af | 495 | if (len > 0 && rl[len - 1] == '\\') |
b5a0ac70 | 496 | { |
b69d38af PA |
497 | /* Don't copy the backslash and wait for more. */ |
498 | buffer_grow (cmd_line_buffer, rl, len - 1); | |
499 | cmd = NULL; | |
b5a0ac70 | 500 | } |
b69d38af | 501 | else |
b5a0ac70 | 502 | { |
b69d38af PA |
503 | /* Copy whole line including terminating null, and we're |
504 | done. */ | |
505 | buffer_grow (cmd_line_buffer, rl, len + 1); | |
506 | cmd = cmd_line_buffer->buffer; | |
b5a0ac70 SS |
507 | } |
508 | ||
b69d38af PA |
509 | /* Allocated in readline. */ |
510 | xfree (rl); | |
b5a0ac70 | 511 | |
b69d38af PA |
512 | return cmd; |
513 | } | |
b5a0ac70 | 514 | |
b69d38af | 515 | /* Handle a line of input coming from readline. |
b5a0ac70 | 516 | |
b69d38af PA |
517 | If the read line ends with a continuation character (backslash), |
518 | save the partial input in CMD_LINE_BUFFER (except the backslash), | |
519 | and return NULL. Otherwise, save the partial input and return a | |
520 | pointer to CMD_LINE_BUFFER's buffer (null terminated), indicating a | |
521 | whole command line is ready to be executed. | |
b5a0ac70 | 522 | |
b69d38af | 523 | Returns EOF on end of file. |
b5a0ac70 | 524 | |
b69d38af | 525 | If REPEAT, handle command repetitions: |
b5a0ac70 | 526 | |
b69d38af PA |
527 | - If the input command line is NOT empty, the command returned is |
528 | copied into the global 'saved_command_line' var so that it can | |
529 | be repeated later. | |
d96429cd | 530 | |
b69d38af PA |
531 | - OTOH, if the input command line IS empty, return the previously |
532 | saved command instead of the empty input line. | |
533 | */ | |
b5a0ac70 | 534 | |
b69d38af PA |
535 | char * |
536 | handle_line_of_input (struct buffer *cmd_line_buffer, | |
537 | char *rl, int repeat, char *annotation_suffix) | |
538 | { | |
539 | char *p1; | |
540 | char *cmd; | |
541 | ||
542 | if (rl == NULL) | |
543 | return (char *) EOF; | |
544 | ||
545 | cmd = command_line_append_input_line (cmd_line_buffer, rl); | |
546 | if (cmd == NULL) | |
547 | return NULL; | |
b5a0ac70 | 548 | |
b69d38af PA |
549 | /* We have a complete command line now. Prepare for the next |
550 | command, but leave ownership of memory to the buffer . */ | |
551 | cmd_line_buffer->used_size = 0; | |
552 | ||
553 | if (annotation_level > 1 && instream == stdin) | |
b5a0ac70 | 554 | { |
b69d38af PA |
555 | printf_unfiltered (("\n\032\032post-")); |
556 | puts_unfiltered (annotation_suffix); | |
557 | printf_unfiltered (("\n")); | |
558 | } | |
559 | ||
560 | #define SERVER_COMMAND_PREFIX "server " | |
561 | if (startswith (cmd, SERVER_COMMAND_PREFIX)) | |
562 | { | |
563 | /* Note that we don't set `saved_command_line'. Between this | |
564 | and the check in dont_repeat, this insures that repeating | |
565 | will still do the right thing. */ | |
566 | return cmd + strlen (SERVER_COMMAND_PREFIX); | |
b5a0ac70 SS |
567 | } |
568 | ||
569 | /* Do history expansion if that is wished. */ | |
570 | if (history_expansion_p && instream == stdin | |
571 | && ISATTY (instream)) | |
572 | { | |
573 | char *history_value; | |
574 | int expanded; | |
575 | ||
b69d38af | 576 | expanded = history_expand (cmd, &history_value); |
b5a0ac70 SS |
577 | if (expanded) |
578 | { | |
b69d38af PA |
579 | size_t len; |
580 | ||
b5a0ac70 SS |
581 | /* Print the changes. */ |
582 | printf_unfiltered ("%s\n", history_value); | |
583 | ||
584 | /* If there was an error, call this function again. */ | |
585 | if (expanded < 0) | |
586 | { | |
b8c9b27d | 587 | xfree (history_value); |
b69d38af | 588 | return cmd; |
b5a0ac70 | 589 | } |
b69d38af PA |
590 | |
591 | /* history_expand returns an allocated string. Just replace | |
592 | our buffer with it. */ | |
593 | len = strlen (history_value); | |
594 | xfree (buffer_finish (cmd_line_buffer)); | |
595 | cmd_line_buffer->buffer = history_value; | |
596 | cmd_line_buffer->buffer_size = len + 1; | |
597 | cmd = history_value; | |
b5a0ac70 SS |
598 | } |
599 | } | |
600 | ||
371d5dec | 601 | /* If we just got an empty line, and that is supposed to repeat the |
b69d38af PA |
602 | previous command, return the previously saved command. */ |
603 | for (p1 = cmd; *p1 == ' ' || *p1 == '\t'; p1++) | |
604 | ; | |
605 | if (repeat && *p1 == '\0') | |
606 | return saved_command_line; | |
607 | ||
608 | /* Add command to history if appropriate. Note: lines consisting | |
609 | solely of comments are also added to the command history. This | |
610 | is useful when you type a command, and then realize you don't | |
611 | want to execute it quite yet. You can comment out the command | |
612 | and then later fetch it from the value history and remove the | |
613 | '#'. The kill ring is probably better, but some people are in | |
614 | the habit of commenting things out. */ | |
615 | if (*cmd != '\0' && input_from_terminal_p ()) | |
616 | gdb_add_history (cmd); | |
b5a0ac70 | 617 | |
b69d38af PA |
618 | /* Save into global buffer if appropriate. */ |
619 | if (repeat) | |
b5a0ac70 | 620 | { |
b69d38af PA |
621 | xfree (saved_command_line); |
622 | saved_command_line = xstrdup (cmd); | |
623 | return saved_command_line; | |
b5a0ac70 | 624 | } |
b69d38af PA |
625 | else |
626 | return cmd; | |
627 | } | |
b5a0ac70 | 628 | |
b69d38af PA |
629 | /* Handle a complete line of input. This is called by the callback |
630 | mechanism within the readline library. Deal with incomplete | |
631 | commands as well, by saving the partial input in a global | |
632 | buffer. | |
b5a0ac70 | 633 | |
b69d38af PA |
634 | NOTE: This is the asynchronous version of the command_line_input |
635 | function. */ | |
b5a0ac70 | 636 | |
b69d38af PA |
637 | void |
638 | command_line_handler (char *rl) | |
639 | { | |
640 | struct buffer *line_buffer = get_command_line_buffer (); | |
641 | char *cmd; | |
b5a0ac70 | 642 | |
b69d38af PA |
643 | cmd = handle_line_of_input (line_buffer, rl, instream == stdin, "prompt"); |
644 | if (cmd == (char *) EOF) | |
b5a0ac70 | 645 | { |
b69d38af PA |
646 | /* stdin closed. The connection with the terminal is gone. |
647 | This happens at the end of a testsuite run, after Expect has | |
648 | hung up but GDB is still alive. In such a case, we just quit | |
649 | gdb killing the inferior program too. */ | |
650 | printf_unfiltered ("quit\n"); | |
651 | execute_command ("quit", stdin == instream); | |
652 | } | |
653 | else if (cmd == NULL) | |
654 | { | |
655 | /* We don't have a full line yet. Print an empty prompt. */ | |
656 | display_gdb_prompt (""); | |
657 | } | |
658 | else | |
659 | { | |
660 | command_handler (cmd); | |
661 | display_gdb_prompt (0); | |
b5a0ac70 | 662 | } |
b5a0ac70 SS |
663 | } |
664 | ||
665 | /* Does reading of input from terminal w/o the editing features | |
c70061cf PA |
666 | provided by the readline library. Calls the line input handler |
667 | once we have a whole input line. */ | |
b5a0ac70 | 668 | |
085dd6e6 | 669 | void |
c70061cf | 670 | gdb_readline_no_editing_callback (gdb_client_data client_data) |
b5a0ac70 SS |
671 | { |
672 | int c; | |
673 | char *result; | |
187212b3 | 674 | struct buffer line_buffer; |
7be570e7 JM |
675 | static int done_once = 0; |
676 | ||
187212b3 PA |
677 | buffer_init (&line_buffer); |
678 | ||
7be570e7 | 679 | /* Unbuffer the input stream, so that, later on, the calls to fgetc |
371d5dec | 680 | fetch only one char at the time from the stream. The fgetc's will |
7be570e7 | 681 | get up to the first newline, but there may be more chars in the |
371d5dec | 682 | stream after '\n'. If we buffer the input and fgetc drains the |
7be570e7 | 683 | stream, getting stuff beyond the newline as well, a select, done |
371d5dec | 684 | afterwards will not trigger. */ |
7be570e7 JM |
685 | if (!done_once && !ISATTY (instream)) |
686 | { | |
687 | setbuf (instream, NULL); | |
688 | done_once = 1; | |
689 | } | |
b5a0ac70 | 690 | |
b5a0ac70 | 691 | /* We still need the while loop here, even though it would seem |
c70061cf PA |
692 | obvious to invoke gdb_readline_no_editing_callback at every |
693 | character entered. If not using the readline library, the | |
694 | terminal is in cooked mode, which sends the characters all at | |
695 | once. Poll will notice that the input fd has changed state only | |
696 | after enter is pressed. At this point we still need to fetch all | |
697 | the chars entered. */ | |
b5a0ac70 SS |
698 | |
699 | while (1) | |
700 | { | |
701 | /* Read from stdin if we are executing a user defined command. | |
702 | This is the right thing for prompt_for_continue, at least. */ | |
703 | c = fgetc (instream ? instream : stdin); | |
704 | ||
705 | if (c == EOF) | |
706 | { | |
187212b3 PA |
707 | if (line_buffer.used_size > 0) |
708 | { | |
709 | /* The last line does not end with a newline. Return it, and | |
710 | if we are called again fgetc will still return EOF and | |
711 | we'll return NULL then. */ | |
712 | break; | |
713 | } | |
714 | xfree (buffer_finish (&line_buffer)); | |
0f71a2f6 | 715 | (*input_handler) (0); |
13ce7133 | 716 | return; |
b5a0ac70 SS |
717 | } |
718 | ||
719 | if (c == '\n') | |
b5a0ac70 | 720 | { |
187212b3 PA |
721 | if (line_buffer.used_size > 0 |
722 | && line_buffer.buffer[line_buffer.used_size - 1] == '\r') | |
723 | line_buffer.used_size--; | |
b5a0ac70 SS |
724 | break; |
725 | } | |
b5a0ac70 | 726 | |
187212b3 | 727 | buffer_grow_char (&line_buffer, c); |
b5a0ac70 SS |
728 | } |
729 | ||
187212b3 PA |
730 | buffer_grow_char (&line_buffer, '\0'); |
731 | result = buffer_finish (&line_buffer); | |
0f71a2f6 | 732 | (*input_handler) (result); |
b5a0ac70 SS |
733 | } |
734 | \f | |
735 | ||
f0881b37 PA |
736 | /* The serial event associated with the QUIT flag. set_quit_flag sets |
737 | this, and check_quit_flag clears it. Used by interruptible_select | |
738 | to be able to do interruptible I/O with no race with the SIGINT | |
739 | handler. */ | |
740 | static struct serial_event *quit_serial_event; | |
741 | ||
b5a0ac70 | 742 | /* Initialization of signal handlers and tokens. There is a function |
371d5dec | 743 | handle_sig* for each of the signals GDB cares about. Specifically: |
b5a0ac70 SS |
744 | SIGINT, SIGFPE, SIGQUIT, SIGTSTP, SIGHUP, SIGWINCH. These |
745 | functions are the actual signal handlers associated to the signals | |
746 | via calls to signal(). The only job for these functions is to | |
747 | enqueue the appropriate event/procedure with the event loop. Such | |
371d5dec | 748 | procedures are the old signal handlers. The event loop will take |
b5a0ac70 | 749 | care of invoking the queued procedures to perform the usual tasks |
371d5dec | 750 | associated with the reception of the signal. */ |
392a587b | 751 | /* NOTE: 1999-04-30 This is the asynchronous version of init_signals. |
b5a0ac70 | 752 | init_signals will become obsolete as we move to have to event loop |
371d5dec | 753 | as the default for gdb. */ |
b5a0ac70 | 754 | void |
c2c6d25f | 755 | async_init_signals (void) |
c5aa993b | 756 | { |
5cc3ce8b PA |
757 | initialize_async_signal_handlers (); |
758 | ||
f0881b37 PA |
759 | quit_serial_event = make_serial_event (); |
760 | ||
b5a0ac70 SS |
761 | signal (SIGINT, handle_sigint); |
762 | sigint_token = | |
0f71a2f6 | 763 | create_async_signal_handler (async_request_quit, NULL); |
a7266fef | 764 | signal (SIGTERM, handle_sigterm); |
06c868a8 JK |
765 | async_sigterm_token |
766 | = create_async_signal_handler (async_sigterm_handler, NULL); | |
b5a0ac70 SS |
767 | |
768 | /* If SIGTRAP was set to SIG_IGN, then the SIG_IGN will get passed | |
769 | to the inferior and breakpoints will be ignored. */ | |
770 | #ifdef SIGTRAP | |
771 | signal (SIGTRAP, SIG_DFL); | |
772 | #endif | |
773 | ||
6d318c73 | 774 | #ifdef SIGQUIT |
b5a0ac70 SS |
775 | /* If we initialize SIGQUIT to SIG_IGN, then the SIG_IGN will get |
776 | passed to the inferior, which we don't want. It would be | |
777 | possible to do a "signal (SIGQUIT, SIG_DFL)" after we fork, but | |
778 | on BSD4.3 systems using vfork, that can affect the | |
779 | GDB process as well as the inferior (the signal handling tables | |
780 | might be in memory, shared between the two). Since we establish | |
781 | a handler for SIGQUIT, when we call exec it will set the signal | |
782 | to SIG_DFL for us. */ | |
783 | signal (SIGQUIT, handle_sigquit); | |
784 | sigquit_token = | |
0f71a2f6 | 785 | create_async_signal_handler (async_do_nothing, NULL); |
6d318c73 | 786 | #endif |
b5a0ac70 SS |
787 | #ifdef SIGHUP |
788 | if (signal (SIGHUP, handle_sighup) != SIG_IGN) | |
789 | sighup_token = | |
0f71a2f6 | 790 | create_async_signal_handler (async_disconnect, NULL); |
b5a0ac70 SS |
791 | else |
792 | sighup_token = | |
0f71a2f6 | 793 | create_async_signal_handler (async_do_nothing, NULL); |
b5a0ac70 SS |
794 | #endif |
795 | signal (SIGFPE, handle_sigfpe); | |
796 | sigfpe_token = | |
0f71a2f6 | 797 | create_async_signal_handler (async_float_handler, NULL); |
b5a0ac70 | 798 | |
0f71a2f6 JM |
799 | #ifdef STOP_SIGNAL |
800 | sigtstp_token = | |
801 | create_async_signal_handler (async_stop_sig, NULL); | |
802 | #endif | |
0f71a2f6 JM |
803 | } |
804 | ||
f0881b37 PA |
805 | /* See defs.h. */ |
806 | ||
807 | void | |
808 | quit_serial_event_set (void) | |
809 | { | |
810 | serial_event_set (quit_serial_event); | |
811 | } | |
812 | ||
813 | /* See defs.h. */ | |
814 | ||
815 | void | |
816 | quit_serial_event_clear (void) | |
817 | { | |
818 | serial_event_clear (quit_serial_event); | |
819 | } | |
820 | ||
821 | /* Return the selectable file descriptor of the serial event | |
822 | associated with the quit flag. */ | |
823 | ||
824 | static int | |
825 | quit_serial_event_fd (void) | |
826 | { | |
827 | return serial_event_fd (quit_serial_event); | |
828 | } | |
829 | ||
048094ac PA |
830 | /* See defs.h. */ |
831 | ||
832 | void | |
833 | default_quit_handler (void) | |
834 | { | |
835 | if (check_quit_flag ()) | |
836 | { | |
837 | if (target_terminal_is_ours ()) | |
838 | quit (); | |
839 | else | |
840 | target_pass_ctrlc (); | |
841 | } | |
842 | } | |
843 | ||
844 | /* See defs.h. */ | |
845 | quit_handler_ftype *quit_handler = default_quit_handler; | |
846 | ||
847 | /* Data for make_cleanup_override_quit_handler. Wrap the previous | |
848 | handler pointer in a data struct because it's not portable to cast | |
849 | a function pointer to a data pointer, which is what make_cleanup | |
850 | expects. */ | |
851 | struct quit_handler_cleanup_data | |
852 | { | |
853 | /* The previous quit handler. */ | |
854 | quit_handler_ftype *prev_handler; | |
855 | }; | |
856 | ||
857 | /* Cleanup call that restores the previous quit handler. */ | |
858 | ||
859 | static void | |
860 | restore_quit_handler (void *arg) | |
861 | { | |
862 | struct quit_handler_cleanup_data *data | |
863 | = (struct quit_handler_cleanup_data *) arg; | |
864 | ||
865 | quit_handler = data->prev_handler; | |
866 | } | |
867 | ||
868 | /* Destructor for the quit handler cleanup. */ | |
869 | ||
870 | static void | |
871 | restore_quit_handler_dtor (void *arg) | |
872 | { | |
873 | xfree (arg); | |
874 | } | |
875 | ||
876 | /* See defs.h. */ | |
877 | ||
878 | struct cleanup * | |
879 | make_cleanup_override_quit_handler (quit_handler_ftype *new_quit_handler) | |
880 | { | |
881 | struct cleanup *old_chain; | |
882 | struct quit_handler_cleanup_data *data; | |
883 | ||
884 | data = XNEW (struct quit_handler_cleanup_data); | |
885 | data->prev_handler = quit_handler; | |
886 | old_chain = make_cleanup_dtor (restore_quit_handler, data, | |
887 | restore_quit_handler_dtor); | |
888 | quit_handler = new_quit_handler; | |
889 | return old_chain; | |
890 | } | |
891 | ||
f0881b37 PA |
892 | /* Handle a SIGINT. */ |
893 | ||
c5aa993b | 894 | void |
c2c6d25f | 895 | handle_sigint (int sig) |
b5a0ac70 SS |
896 | { |
897 | signal (sig, handle_sigint); | |
898 | ||
5f960e00 FF |
899 | /* We could be running in a loop reading in symfiles or something so |
900 | it may be quite a while before we get back to the event loop. So | |
371d5dec | 901 | set quit_flag to 1 here. Then if QUIT is called before we get to |
5f960e00 | 902 | the event loop, we will unwind as expected. */ |
522002f9 | 903 | set_quit_flag (); |
5f960e00 | 904 | |
585a46a2 PA |
905 | /* In case nothing calls QUIT before the event loop is reached, the |
906 | event loop handles it. */ | |
907 | mark_async_signal_handler (sigint_token); | |
b5a0ac70 SS |
908 | } |
909 | ||
f0881b37 PA |
910 | /* See gdb_select.h. */ |
911 | ||
912 | int | |
913 | interruptible_select (int n, | |
914 | fd_set *readfds, fd_set *writefds, fd_set *exceptfds, | |
915 | struct timeval *timeout) | |
916 | { | |
917 | fd_set my_readfds; | |
918 | int fd; | |
919 | int res; | |
920 | ||
921 | if (readfds == NULL) | |
922 | { | |
923 | readfds = &my_readfds; | |
924 | FD_ZERO (&my_readfds); | |
925 | } | |
926 | ||
927 | fd = quit_serial_event_fd (); | |
928 | FD_SET (fd, readfds); | |
929 | if (n <= fd) | |
930 | n = fd + 1; | |
931 | ||
932 | do | |
933 | { | |
934 | res = gdb_select (n, readfds, writefds, exceptfds, timeout); | |
935 | } | |
936 | while (res == -1 && errno == EINTR); | |
937 | ||
938 | if (res == 1 && FD_ISSET (fd, readfds)) | |
939 | { | |
940 | errno = EINTR; | |
941 | return -1; | |
942 | } | |
943 | return res; | |
944 | } | |
945 | ||
06c868a8 JK |
946 | /* Handle GDB exit upon receiving SIGTERM if target_can_async_p (). */ |
947 | ||
948 | static void | |
949 | async_sigterm_handler (gdb_client_data arg) | |
950 | { | |
951 | quit_force (NULL, stdin == instream); | |
952 | } | |
953 | ||
954 | /* See defs.h. */ | |
955 | volatile int sync_quit_force_run; | |
956 | ||
a7266fef AS |
957 | /* Quit GDB if SIGTERM is received. |
958 | GDB would quit anyway, but this way it will clean up properly. */ | |
959 | void | |
960 | handle_sigterm (int sig) | |
961 | { | |
962 | signal (sig, handle_sigterm); | |
06c868a8 | 963 | |
077836f7 PP |
964 | sync_quit_force_run = 1; |
965 | set_quit_flag (); | |
966 | ||
967 | mark_async_signal_handler (async_sigterm_token); | |
a7266fef AS |
968 | } |
969 | ||
371d5dec | 970 | /* Do the quit. All the checks have been done by the caller. */ |
c5aa993b | 971 | void |
c2c6d25f | 972 | async_request_quit (gdb_client_data arg) |
b5a0ac70 | 973 | { |
5f960e00 | 974 | /* If the quit_flag has gotten reset back to 0 by the time we get |
4ac94eda FF |
975 | back here, that means that an exception was thrown to unwind the |
976 | current command before we got back to the event loop. So there | |
522002f9 | 977 | is no reason to call quit again here. */ |
048094ac | 978 | QUIT; |
b5a0ac70 SS |
979 | } |
980 | ||
6d318c73 | 981 | #ifdef SIGQUIT |
371d5dec MS |
982 | /* Tell the event loop what to do if SIGQUIT is received. |
983 | See event-signal.c. */ | |
c5aa993b | 984 | static void |
c2c6d25f | 985 | handle_sigquit (int sig) |
b5a0ac70 | 986 | { |
f6fbab7d | 987 | mark_async_signal_handler (sigquit_token); |
b5a0ac70 SS |
988 | signal (sig, handle_sigquit); |
989 | } | |
6d318c73 | 990 | #endif |
b5a0ac70 | 991 | |
0f0b8dcd DJ |
992 | #if defined (SIGQUIT) || defined (SIGHUP) |
993 | /* Called by the event loop in response to a SIGQUIT or an | |
994 | ignored SIGHUP. */ | |
c5aa993b | 995 | static void |
c2c6d25f | 996 | async_do_nothing (gdb_client_data arg) |
b5a0ac70 | 997 | { |
371d5dec | 998 | /* Empty function body. */ |
b5a0ac70 | 999 | } |
0f0b8dcd | 1000 | #endif |
b5a0ac70 SS |
1001 | |
1002 | #ifdef SIGHUP | |
371d5dec MS |
1003 | /* Tell the event loop what to do if SIGHUP is received. |
1004 | See event-signal.c. */ | |
c5aa993b | 1005 | static void |
fba45db2 | 1006 | handle_sighup (int sig) |
b5a0ac70 | 1007 | { |
f6fbab7d | 1008 | mark_async_signal_handler (sighup_token); |
b5a0ac70 SS |
1009 | signal (sig, handle_sighup); |
1010 | } | |
1011 | ||
371d5dec | 1012 | /* Called by the event loop to process a SIGHUP. */ |
c5aa993b | 1013 | static void |
c2c6d25f | 1014 | async_disconnect (gdb_client_data arg) |
b5a0ac70 | 1015 | { |
b2cd6b29 | 1016 | |
492d29ea | 1017 | TRY |
b2cd6b29 JM |
1018 | { |
1019 | quit_cover (); | |
1020 | } | |
1021 | ||
492d29ea | 1022 | CATCH (exception, RETURN_MASK_ALL) |
b2cd6b29 JM |
1023 | { |
1024 | fputs_filtered ("Could not kill the program being debugged", | |
1025 | gdb_stderr); | |
1026 | exception_print (gdb_stderr, exception); | |
1027 | } | |
492d29ea | 1028 | END_CATCH |
b2cd6b29 | 1029 | |
492d29ea | 1030 | TRY |
b2cd6b29 | 1031 | { |
460014f5 | 1032 | pop_all_targets (); |
b2cd6b29 | 1033 | } |
492d29ea PA |
1034 | CATCH (exception, RETURN_MASK_ALL) |
1035 | { | |
1036 | } | |
1037 | END_CATCH | |
b2cd6b29 | 1038 | |
371d5dec | 1039 | signal (SIGHUP, SIG_DFL); /*FIXME: ??????????? */ |
ec4dfccf | 1040 | raise (SIGHUP); |
b5a0ac70 SS |
1041 | } |
1042 | #endif | |
1043 | ||
0f71a2f6 | 1044 | #ifdef STOP_SIGNAL |
c5aa993b | 1045 | void |
c2c6d25f | 1046 | handle_stop_sig (int sig) |
0f71a2f6 | 1047 | { |
f6fbab7d | 1048 | mark_async_signal_handler (sigtstp_token); |
c5aa993b | 1049 | signal (sig, handle_stop_sig); |
0f71a2f6 JM |
1050 | } |
1051 | ||
1052 | static void | |
c2c6d25f | 1053 | async_stop_sig (gdb_client_data arg) |
0f71a2f6 | 1054 | { |
ab821bc6 | 1055 | char *prompt = get_prompt (); |
d7f9d729 | 1056 | |
0f71a2f6 JM |
1057 | #if STOP_SIGNAL == SIGTSTP |
1058 | signal (SIGTSTP, SIG_DFL); | |
2acceee2 JM |
1059 | #if HAVE_SIGPROCMASK |
1060 | { | |
1061 | sigset_t zero; | |
46711df8 | 1062 | |
2acceee2 JM |
1063 | sigemptyset (&zero); |
1064 | sigprocmask (SIG_SETMASK, &zero, 0); | |
1065 | } | |
46711df8 | 1066 | #elif HAVE_SIGSETMASK |
0f71a2f6 | 1067 | sigsetmask (0); |
2acceee2 | 1068 | #endif |
ec4dfccf | 1069 | raise (SIGTSTP); |
0f71a2f6 JM |
1070 | signal (SIGTSTP, handle_stop_sig); |
1071 | #else | |
1072 | signal (STOP_SIGNAL, handle_stop_sig); | |
1073 | #endif | |
1074 | printf_unfiltered ("%s", prompt); | |
1075 | gdb_flush (gdb_stdout); | |
1076 | ||
371d5dec MS |
1077 | /* Forget about any previous command -- null line now will do |
1078 | nothing. */ | |
0f71a2f6 JM |
1079 | dont_repeat (); |
1080 | } | |
1081 | #endif /* STOP_SIGNAL */ | |
1082 | ||
371d5dec MS |
1083 | /* Tell the event loop what to do if SIGFPE is received. |
1084 | See event-signal.c. */ | |
c5aa993b | 1085 | static void |
c2c6d25f | 1086 | handle_sigfpe (int sig) |
b5a0ac70 | 1087 | { |
f6fbab7d | 1088 | mark_async_signal_handler (sigfpe_token); |
b5a0ac70 SS |
1089 | signal (sig, handle_sigfpe); |
1090 | } | |
1091 | ||
371d5dec | 1092 | /* Event loop will call this functin to process a SIGFPE. */ |
c5aa993b | 1093 | static void |
c2c6d25f | 1094 | async_float_handler (gdb_client_data arg) |
b5a0ac70 | 1095 | { |
371d5dec MS |
1096 | /* This message is based on ANSI C, section 4.7. Note that integer |
1097 | divide by zero causes this, so "float" is a misnomer. */ | |
8a3fe4f8 | 1098 | error (_("Erroneous arithmetic operation.")); |
b5a0ac70 | 1099 | } |
b5a0ac70 SS |
1100 | \f |
1101 | ||
1102 | /* Called by do_setshow_command. */ | |
b5a0ac70 | 1103 | void |
371d5dec MS |
1104 | set_async_editing_command (char *args, int from_tty, |
1105 | struct cmd_list_element *c) | |
b5a0ac70 SS |
1106 | { |
1107 | change_line_handler (); | |
1108 | } | |
1109 | ||
0f71a2f6 | 1110 | /* Set things up for readline to be invoked via the alternate |
3c610247 PA |
1111 | interface, i.e. via a callback function |
1112 | (gdb_rl_callback_read_char), and hook up instream to the event | |
1113 | loop. */ | |
1114 | ||
0f71a2f6 | 1115 | void |
cee6ddeb | 1116 | gdb_setup_readline (void) |
0f71a2f6 | 1117 | { |
362646f5 AC |
1118 | /* This function is a noop for the sync case. The assumption is |
1119 | that the sync setup is ALL done in gdb_init, and we would only | |
1120 | mess it up here. The sync stuff should really go away over | |
1121 | time. */ | |
1a088d06 AS |
1122 | if (!batch_silent) |
1123 | gdb_stdout = stdio_fileopen (stdout); | |
ffa4ac95 | 1124 | gdb_stderr = stderr_fileopen (); |
362646f5 AC |
1125 | gdb_stdlog = gdb_stderr; /* for moment */ |
1126 | gdb_stdtarg = gdb_stderr; /* for moment */ | |
8d4d924b | 1127 | gdb_stdtargerr = gdb_stderr; /* for moment */ |
362646f5 AC |
1128 | |
1129 | /* If the input stream is connected to a terminal, turn on | |
1130 | editing. */ | |
1131 | if (ISATTY (instream)) | |
9e0b60a8 | 1132 | { |
371d5dec | 1133 | /* Tell gdb that we will be using the readline library. This |
362646f5 AC |
1134 | could be overwritten by a command in .gdbinit like 'set |
1135 | editing on' or 'off'. */ | |
1136 | async_command_editing_p = 1; | |
c5201926 | 1137 | |
362646f5 AC |
1138 | /* When a character is detected on instream by select or poll, |
1139 | readline will be invoked via this callback function. */ | |
3c610247 | 1140 | call_readline = gdb_rl_callback_read_char_wrapper; |
9e0b60a8 | 1141 | } |
362646f5 AC |
1142 | else |
1143 | { | |
1144 | async_command_editing_p = 0; | |
c70061cf | 1145 | call_readline = gdb_readline_no_editing_callback; |
362646f5 AC |
1146 | } |
1147 | ||
1148 | /* When readline has read an end-of-line character, it passes the | |
371d5dec | 1149 | complete line to gdb for processing; command_line_handler is the |
362646f5 AC |
1150 | function that does this. */ |
1151 | input_handler = command_line_handler; | |
1152 | ||
371d5dec | 1153 | /* Tell readline to use the same input stream that gdb uses. */ |
362646f5 AC |
1154 | rl_instream = instream; |
1155 | ||
1156 | /* Get a file descriptor for the input stream, so that we can | |
1157 | register it with the event loop. */ | |
1158 | input_fd = fileno (instream); | |
1159 | ||
1160 | /* Now we need to create the event sources for the input file | |
1161 | descriptor. */ | |
1162 | /* At this point in time, this is the only event source that we | |
371d5dec | 1163 | register with the even loop. Another source is going to be the |
362646f5 AC |
1164 | target program (inferior), but that must be registered only when |
1165 | it actually exists (I.e. after we say 'run' or after we connect | |
1166 | to a remote target. */ | |
1167 | add_file_handler (input_fd, stdin_event_handler, 0); | |
0f71a2f6 | 1168 | } |
cee6ddeb | 1169 | |
7d5b6fdd EZ |
1170 | /* Disable command input through the standard CLI channels. Used in |
1171 | the suspend proc for interpreters that use the standard gdb readline | |
1172 | interface, like the cli & the mi. */ | |
1173 | void | |
1174 | gdb_disable_readline (void) | |
1175 | { | |
362646f5 AC |
1176 | /* FIXME - It is too heavyweight to delete and remake these every |
1177 | time you run an interpreter that needs readline. It is probably | |
1178 | better to have the interpreters cache these, which in turn means | |
1179 | that this needs to be moved into interpreter specific code. */ | |
7d5b6fdd EZ |
1180 | |
1181 | #if 0 | |
362646f5 AC |
1182 | ui_file_delete (gdb_stdout); |
1183 | ui_file_delete (gdb_stderr); | |
1184 | gdb_stdlog = NULL; | |
1185 | gdb_stdtarg = NULL; | |
8d4d924b | 1186 | gdb_stdtargerr = NULL; |
7d5b6fdd EZ |
1187 | #endif |
1188 | ||
d3d4baed | 1189 | gdb_rl_callback_handler_remove (); |
362646f5 | 1190 | delete_file_handler (input_fd); |
7d5b6fdd | 1191 | } |