Commit | Line | Data |
---|---|---|
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 JM |
51 | static void rl_callback_read_char_wrapper (gdb_client_data client_data); |
52 | static void command_line_handler (char *rl); | |
c2c6d25f | 53 | static void change_line_handler (void); |
ab821bc6 | 54 | static char *top_level_prompt (void); |
b5a0ac70 | 55 | |
371d5dec | 56 | /* Signal handlers. */ |
6d318c73 | 57 | #ifdef SIGQUIT |
c2c6d25f | 58 | static void handle_sigquit (int sig); |
6d318c73 | 59 | #endif |
0f0b8dcd | 60 | #ifdef SIGHUP |
c2c6d25f | 61 | static void handle_sighup (int sig); |
0f0b8dcd | 62 | #endif |
c2c6d25f | 63 | static void handle_sigfpe (int sig); |
b5a0ac70 SS |
64 | |
65 | /* Functions to be invoked by the event loop in response to | |
371d5dec | 66 | signals. */ |
0f0b8dcd | 67 | #if defined (SIGQUIT) || defined (SIGHUP) |
c2c6d25f | 68 | static void async_do_nothing (gdb_client_data); |
0f0b8dcd DJ |
69 | #endif |
70 | #ifdef SIGHUP | |
c2c6d25f | 71 | static void async_disconnect (gdb_client_data); |
0f0b8dcd | 72 | #endif |
c2c6d25f | 73 | static void async_float_handler (gdb_client_data); |
0f0b8dcd | 74 | #ifdef STOP_SIGNAL |
c2c6d25f | 75 | static void async_stop_sig (gdb_client_data); |
0f0b8dcd | 76 | #endif |
06c868a8 | 77 | static void async_sigterm_handler (gdb_client_data arg); |
b5a0ac70 | 78 | |
b5a0ac70 | 79 | /* Readline offers an alternate interface, via callback |
371d5dec | 80 | functions. These are all included in the file callback.c in the |
b5a0ac70 SS |
81 | readline distribution. This file provides (mainly) a function, which |
82 | the event loop uses as callback (i.e. event handler) whenever an event | |
83 | is detected on the standard input file descriptor. | |
84 | readline_callback_read_char is called (by the GDB event loop) whenever | |
371d5dec | 85 | there is a new character ready on the input stream. This function |
b5a0ac70 SS |
86 | incrementally builds a buffer internal to readline where it |
87 | accumulates the line read up to the point of invocation. In the | |
88 | special case in which the character read is newline, the function | |
89 | invokes a GDB supplied callback routine, which does the processing of | |
90 | a full command line. This latter routine is the asynchronous analog | |
371d5dec | 91 | of the old command_line_input in gdb. Instead of invoking (and waiting |
b5a0ac70 SS |
92 | for) readline to read the command line and pass it back to |
93 | command_loop for processing, the new command_line_handler function has | |
94 | the command line already available as its parameter. INPUT_HANDLER is | |
95 | to be set to the function that readline will invoke when a complete | |
96 | line of input is ready. CALL_READLINE is to be set to the function | |
371d5dec | 97 | that readline offers as callback to the event_loop. */ |
b5a0ac70 | 98 | |
c2c6d25f JM |
99 | void (*input_handler) (char *); |
100 | void (*call_readline) (gdb_client_data); | |
b5a0ac70 | 101 | |
371d5dec | 102 | /* Important variables for the event loop. */ |
b5a0ac70 SS |
103 | |
104 | /* This is used to determine if GDB is using the readline library or | |
371d5dec | 105 | its own simplified form of readline. It is used by the asynchronous |
0f71a2f6 | 106 | form of the set editing command. |
392a587b | 107 | ezannoni: as of 1999-04-29 I expect that this |
b5a0ac70 | 108 | variable will not be used after gdb is changed to use the event |
371d5dec | 109 | loop as default engine, and event-top.c is merged into top.c. */ |
b5a0ac70 SS |
110 | int async_command_editing_p; |
111 | ||
104c1213 | 112 | /* This is used to display the notification of the completion of an |
371d5dec | 113 | asynchronous execution command. */ |
104c1213 JM |
114 | int exec_done_display_p = 0; |
115 | ||
b5a0ac70 | 116 | /* This is the file descriptor for the input stream that GDB uses to |
371d5dec | 117 | read commands from. */ |
b5a0ac70 SS |
118 | int input_fd; |
119 | ||
d64e57fa PP |
120 | /* Used by the stdin event handler to compensate for missed stdin events. |
121 | Setting this to a non-zero value inside an stdin callback makes the callback | |
122 | run again. */ | |
123 | int call_stdin_event_handler_again_p; | |
124 | ||
371d5dec | 125 | /* Signal handling variables. */ |
b5a0ac70 | 126 | /* Each of these is a pointer to a function that the event loop will |
371d5dec | 127 | invoke if the corresponding signal has received. The real signal |
b5a0ac70 | 128 | handlers mark these functions as ready to be executed and the event |
371d5dec MS |
129 | loop, in a later iteration, calls them. See the function |
130 | invoke_async_signal_handler. */ | |
05fa9251 | 131 | static struct async_signal_handler *sigint_token; |
b5a0ac70 | 132 | #ifdef SIGHUP |
05fa9251 | 133 | static struct async_signal_handler *sighup_token; |
b5a0ac70 | 134 | #endif |
6d318c73 | 135 | #ifdef SIGQUIT |
05fa9251 | 136 | static struct async_signal_handler *sigquit_token; |
6d318c73 | 137 | #endif |
05fa9251 | 138 | static struct async_signal_handler *sigfpe_token; |
0f71a2f6 | 139 | #ifdef STOP_SIGNAL |
05fa9251 | 140 | static struct async_signal_handler *sigtstp_token; |
0f71a2f6 | 141 | #endif |
06c868a8 | 142 | static struct async_signal_handler *async_sigterm_token; |
0f71a2f6 | 143 | |
467d8519 TT |
144 | /* This hook is called by rl_callback_read_char_wrapper after each |
145 | character is processed. */ | |
b08ee6a2 | 146 | void (*after_char_processing_hook) (void); |
b5a0ac70 SS |
147 | \f |
148 | ||
371d5dec MS |
149 | /* Wrapper function for calling into the readline library. The event |
150 | loop expects the callback function to have a paramter, while | |
151 | readline expects none. */ | |
c2c6d25f JM |
152 | static void |
153 | rl_callback_read_char_wrapper (gdb_client_data client_data) | |
154 | { | |
155 | rl_callback_read_char (); | |
467d8519 TT |
156 | if (after_char_processing_hook) |
157 | (*after_char_processing_hook) (); | |
c2c6d25f JM |
158 | } |
159 | ||
b5a0ac70 | 160 | /* Initialize all the necessary variables, start the event loop, |
4d09c5b4 AB |
161 | register readline, and stdin, start the loop. The DATA is the |
162 | interpreter data cookie, ignored for now. */ | |
163 | ||
b5a0ac70 | 164 | void |
4d09c5b4 | 165 | cli_command_loop (void *data) |
b5a0ac70 | 166 | { |
7d8e6458 | 167 | display_gdb_prompt (0); |
b5a0ac70 | 168 | |
371d5dec | 169 | /* Now it's time to start the event loop. */ |
085dd6e6 | 170 | start_event_loop (); |
b5a0ac70 SS |
171 | } |
172 | ||
173 | /* Change the function to be invoked every time there is a character | |
371d5dec | 174 | ready on stdin. This is used when the user sets the editing off, |
b5a0ac70 | 175 | therefore bypassing readline, and letting gdb handle the input |
c70061cf PA |
176 | itself, via gdb_readline_no_editing_callback. Also it is used in |
177 | the opposite case in which the user sets editing on again, by | |
178 | restoring readline handling of the input. */ | |
392a587b | 179 | static void |
c2c6d25f | 180 | change_line_handler (void) |
b5a0ac70 | 181 | { |
371d5dec MS |
182 | /* NOTE: this operates on input_fd, not instream. If we are reading |
183 | commands from a file, instream will point to the file. However in | |
c2c6d25f | 184 | async mode, we always read commands from a file with editing |
371d5dec MS |
185 | off. This means that the 'set editing on/off' will have effect |
186 | only on the interactive session. */ | |
c2c6d25f | 187 | |
b5a0ac70 SS |
188 | if (async_command_editing_p) |
189 | { | |
371d5dec | 190 | /* Turn on editing by using readline. */ |
c2c6d25f | 191 | call_readline = rl_callback_read_char_wrapper; |
0f71a2f6 | 192 | input_handler = command_line_handler; |
b5a0ac70 SS |
193 | } |
194 | else | |
195 | { | |
c70061cf | 196 | /* Turn off editing by using gdb_readline_no_editing_callback. */ |
d3d4baed | 197 | gdb_rl_callback_handler_remove (); |
c70061cf | 198 | call_readline = gdb_readline_no_editing_callback; |
0f71a2f6 JM |
199 | |
200 | /* Set up the command handler as well, in case we are called as | |
371d5dec | 201 | first thing from .gdbinit. */ |
0f71a2f6 | 202 | input_handler = command_line_handler; |
b5a0ac70 | 203 | } |
b5a0ac70 SS |
204 | } |
205 | ||
d3d4baed PA |
206 | /* The functions below are wrappers for rl_callback_handler_remove and |
207 | rl_callback_handler_install that keep track of whether the callback | |
208 | handler is installed in readline. This is necessary because after | |
209 | handling a target event of a background execution command, we may | |
210 | need to reinstall the callback handler if it was removed due to a | |
211 | secondary prompt. See gdb_readline_wrapper_line. We don't | |
212 | unconditionally install the handler for every target event because | |
213 | that also clears the line buffer, thus installing it while the user | |
214 | is typing would lose input. */ | |
215 | ||
216 | /* Whether we've registered a callback handler with readline. */ | |
217 | static int callback_handler_installed; | |
218 | ||
219 | /* See event-top.h, and above. */ | |
220 | ||
221 | void | |
222 | gdb_rl_callback_handler_remove (void) | |
223 | { | |
224 | rl_callback_handler_remove (); | |
225 | callback_handler_installed = 0; | |
226 | } | |
227 | ||
228 | /* See event-top.h, and above. Note this wrapper doesn't have an | |
229 | actual callback parameter because we always install | |
230 | INPUT_HANDLER. */ | |
231 | ||
232 | void | |
233 | gdb_rl_callback_handler_install (const char *prompt) | |
234 | { | |
235 | /* Calling rl_callback_handler_install resets readline's input | |
236 | buffer. Calling this when we were already processing input | |
237 | therefore loses input. */ | |
238 | gdb_assert (!callback_handler_installed); | |
239 | ||
240 | rl_callback_handler_install (prompt, input_handler); | |
241 | callback_handler_installed = 1; | |
242 | } | |
243 | ||
244 | /* See event-top.h, and above. */ | |
245 | ||
246 | void | |
247 | gdb_rl_callback_handler_reinstall (void) | |
248 | { | |
249 | if (!callback_handler_installed) | |
250 | { | |
251 | /* Passing NULL as prompt argument tells readline to not display | |
252 | a prompt. */ | |
253 | gdb_rl_callback_handler_install (NULL); | |
254 | } | |
255 | } | |
256 | ||
ab821bc6 PA |
257 | /* Displays the prompt. If the argument NEW_PROMPT is NULL, the |
258 | prompt that is displayed is the current top level prompt. | |
259 | Otherwise, it displays whatever NEW_PROMPT is as a local/secondary | |
260 | prompt. | |
261 | ||
262 | This is used after each gdb command has completed, and in the | |
263 | following cases: | |
264 | ||
371d5dec | 265 | 1. When the user enters a command line which is ended by '\' |
ab821bc6 PA |
266 | indicating that the command will continue on the next line. In |
267 | that case the prompt that is displayed is the empty string. | |
268 | ||
0f71a2f6 | 269 | 2. When the user is entering 'commands' for a breakpoint, or |
371d5dec | 270 | actions for a tracepoint. In this case the prompt will be '>' |
ab821bc6 PA |
271 | |
272 | 3. On prompting for pagination. */ | |
273 | ||
b5a0ac70 | 274 | void |
38bcc89d | 275 | display_gdb_prompt (const char *new_prompt) |
b5a0ac70 | 276 | { |
d17b6f81 | 277 | char *actual_gdb_prompt = NULL; |
ab821bc6 | 278 | struct cleanup *old_chain; |
b5a0ac70 | 279 | |
bd00c694 PA |
280 | annotate_display_prompt (); |
281 | ||
16026cd7 AS |
282 | /* Reset the nesting depth used when trace-commands is set. */ |
283 | reset_command_nest_depth (); | |
284 | ||
ab821bc6 | 285 | old_chain = make_cleanup (free_current_contents, &actual_gdb_prompt); |
d17b6f81 | 286 | |
ab821bc6 PA |
287 | /* Do not call the python hook on an explicit prompt change as |
288 | passed to this function, as this forms a secondary/local prompt, | |
289 | IE, displayed but not set. */ | |
290 | if (! new_prompt) | |
adf40b2e | 291 | { |
ab821bc6 | 292 | if (sync_execution) |
d17b6f81 | 293 | { |
ab821bc6 PA |
294 | /* This is to trick readline into not trying to display the |
295 | prompt. Even though we display the prompt using this | |
296 | function, readline still tries to do its own display if | |
297 | we don't call rl_callback_handler_install and | |
298 | rl_callback_handler_remove (which readline detects | |
299 | because a global variable is not set). If readline did | |
300 | that, it could mess up gdb signal handlers for SIGINT. | |
301 | Readline assumes that between calls to rl_set_signals and | |
302 | rl_clear_signals gdb doesn't do anything with the signal | |
303 | handlers. Well, that's not the case, because when the | |
304 | target executes we change the SIGINT signal handler. If | |
305 | we allowed readline to display the prompt, the signal | |
306 | handler change would happen exactly between the calls to | |
307 | the above two functions. Calling | |
308 | rl_callback_handler_remove(), does the job. */ | |
309 | ||
d3d4baed | 310 | gdb_rl_callback_handler_remove (); |
faab9922 | 311 | do_cleanups (old_chain); |
ab821bc6 | 312 | return; |
d17b6f81 PM |
313 | } |
314 | else | |
ab821bc6 PA |
315 | { |
316 | /* Display the top level prompt. */ | |
317 | actual_gdb_prompt = top_level_prompt (); | |
318 | } | |
b5a0ac70 | 319 | } |
ab821bc6 PA |
320 | else |
321 | actual_gdb_prompt = xstrdup (new_prompt); | |
b5a0ac70 SS |
322 | |
323 | if (async_command_editing_p) | |
324 | { | |
d3d4baed PA |
325 | gdb_rl_callback_handler_remove (); |
326 | gdb_rl_callback_handler_install (actual_gdb_prompt); | |
b5a0ac70 | 327 | } |
371d5dec | 328 | /* new_prompt at this point can be the top of the stack or the one |
d014929c MS |
329 | passed in. It can't be NULL. */ |
330 | else | |
b5a0ac70 SS |
331 | { |
332 | /* Don't use a _filtered function here. It causes the assumed | |
333 | character position to be off, since the newline we read from | |
334 | the user is not accounted for. */ | |
d17b6f81 | 335 | fputs_unfiltered (actual_gdb_prompt, gdb_stdout); |
b5a0ac70 SS |
336 | gdb_flush (gdb_stdout); |
337 | } | |
ab821bc6 PA |
338 | |
339 | do_cleanups (old_chain); | |
b5a0ac70 SS |
340 | } |
341 | ||
ab821bc6 PA |
342 | /* Return the top level prompt, as specified by "set prompt", possibly |
343 | overriden by the python gdb.prompt_hook hook, and then composed | |
344 | with the prompt prefix and suffix (annotations). The caller is | |
345 | responsible for freeing the returned string. */ | |
346 | ||
347 | static char * | |
348 | top_level_prompt (void) | |
b5a0ac70 | 349 | { |
608ff013 | 350 | char *prompt; |
b5a0ac70 | 351 | |
ab821bc6 PA |
352 | /* Give observers a chance of changing the prompt. E.g., the python |
353 | `gdb.prompt_hook' is installed as an observer. */ | |
354 | observer_notify_before_prompt (get_prompt ()); | |
355 | ||
608ff013 | 356 | prompt = get_prompt (); |
b5a0ac70 | 357 | |
ab821bc6 | 358 | if (annotation_level >= 2) |
b5a0ac70 | 359 | { |
ab821bc6 | 360 | /* Prefix needs to have new line at end. */ |
608ff013 | 361 | const char prefix[] = "\n\032\032pre-prompt\n"; |
ab821bc6 PA |
362 | |
363 | /* Suffix needs to have a new line at end and \032 \032 at | |
364 | beginning. */ | |
608ff013 | 365 | const char suffix[] = "\n\032\032prompt\n"; |
b5a0ac70 | 366 | |
608ff013 PA |
367 | return concat (prefix, prompt, suffix, NULL); |
368 | } | |
ab821bc6 | 369 | |
608ff013 | 370 | return xstrdup (prompt); |
b5a0ac70 | 371 | } |
c2c6d25f | 372 | |
b69d38af PA |
373 | /* Get a pointer to the command line buffer. This is used to |
374 | construct a whole line of input from partial input. */ | |
375 | ||
376 | static struct buffer * | |
377 | get_command_line_buffer (void) | |
378 | { | |
379 | static struct buffer line_buffer; | |
380 | static int line_buffer_initialized; | |
381 | ||
382 | if (!line_buffer_initialized) | |
383 | { | |
384 | buffer_init (&line_buffer); | |
385 | line_buffer_initialized = 1; | |
386 | } | |
387 | ||
388 | return &line_buffer; | |
389 | } | |
390 | ||
187212b3 | 391 | /* When there is an event ready on the stdin file descriptor, instead |
c2c6d25f | 392 | of calling readline directly throught the callback function, or |
c70061cf PA |
393 | instead of calling gdb_readline_no_editing_callback, give gdb a |
394 | chance to detect errors and do something. */ | |
395 | ||
c2c6d25f | 396 | void |
2acceee2 | 397 | stdin_event_handler (int error, gdb_client_data client_data) |
c2c6d25f JM |
398 | { |
399 | if (error) | |
400 | { | |
a3f17187 | 401 | printf_unfiltered (_("error detected on stdin\n")); |
2acceee2 | 402 | delete_file_handler (input_fd); |
371d5dec | 403 | /* If stdin died, we may as well kill gdb. */ |
c5394b80 | 404 | quit_command ((char *) 0, stdin == instream); |
c2c6d25f JM |
405 | } |
406 | else | |
d64e57fa | 407 | { |
d2acc30b PA |
408 | /* This makes sure a ^C immediately followed by further input is |
409 | always processed in that order. E.g,. with input like | |
410 | "^Cprint 1\n", the SIGINT handler runs, marks the async signal | |
411 | handler, and then select/poll may return with stdin ready, | |
412 | instead of -1/EINTR. The | |
413 | gdb.base/double-prompt-target-event-error.exp test exercises | |
414 | this. */ | |
415 | QUIT; | |
416 | ||
d64e57fa PP |
417 | do |
418 | { | |
419 | call_stdin_event_handler_again_p = 0; | |
420 | (*call_readline) (client_data); | |
421 | } while (call_stdin_event_handler_again_p != 0); | |
422 | } | |
c2c6d25f JM |
423 | } |
424 | ||
6426a772 JM |
425 | /* Re-enable stdin after the end of an execution command in |
426 | synchronous mode, or after an error from the target, and we aborted | |
371d5dec | 427 | the exec operation. */ |
6426a772 JM |
428 | |
429 | void | |
712af3be | 430 | async_enable_stdin (void) |
6426a772 | 431 | { |
32c1e744 VP |
432 | if (sync_execution) |
433 | { | |
371d5dec | 434 | /* See NOTE in async_disable_stdin(). */ |
32c1e744 VP |
435 | /* FIXME: cagney/1999-09-27: Call this before clearing |
436 | sync_execution. Current target_terminal_ours() implementations | |
371d5dec | 437 | check for sync_execution before switching the terminal. */ |
32c1e744 | 438 | target_terminal_ours (); |
32c1e744 VP |
439 | sync_execution = 0; |
440 | } | |
6426a772 JM |
441 | } |
442 | ||
443 | /* Disable reads from stdin (the console) marking the command as | |
371d5dec | 444 | synchronous. */ |
6426a772 JM |
445 | |
446 | void | |
447 | async_disable_stdin (void) | |
448 | { | |
ab821bc6 | 449 | sync_execution = 1; |
6426a772 | 450 | } |
b5a0ac70 | 451 | \f |
6426a772 | 452 | |
b69d38af PA |
453 | /* Handle a gdb command line. This function is called when |
454 | handle_line_of_input has concatenated one or more input lines into | |
455 | a whole command. */ | |
456 | ||
457 | void | |
c2c6d25f | 458 | command_handler (char *command) |
b5a0ac70 | 459 | { |
0f3bb72e | 460 | struct cleanup *stat_chain; |
b69d38af | 461 | char *c; |
b5a0ac70 | 462 | |
bc008695 | 463 | if (instream == stdin) |
b5a0ac70 | 464 | reinitialize_more_filter (); |
b5a0ac70 | 465 | |
0f3bb72e | 466 | stat_chain = make_command_stats_cleanup (1); |
b5a0ac70 | 467 | |
b69d38af PA |
468 | /* Do not execute commented lines. */ |
469 | for (c = command; *c == ' ' || *c == '\t'; c++) | |
470 | ; | |
471 | if (c[0] != '#') | |
472 | { | |
473 | execute_command (command, instream == stdin); | |
c5aa993b | 474 | |
b69d38af PA |
475 | /* Do any commands attached to breakpoint we stopped at. */ |
476 | bpstat_do_actions (); | |
477 | } | |
c5aa993b | 478 | |
0f3bb72e | 479 | do_cleanups (stat_chain); |
43ff13b4 JM |
480 | } |
481 | ||
b69d38af PA |
482 | /* Append RL, an input line returned by readline or one of its |
483 | emulations, to CMD_LINE_BUFFER. Returns the command line if we | |
484 | have a whole command line ready to be processed by the command | |
485 | interpreter or NULL if the command line isn't complete yet (input | |
486 | line ends in a backslash). Takes ownership of RL. */ | |
b5a0ac70 | 487 | |
b69d38af PA |
488 | static char * |
489 | command_line_append_input_line (struct buffer *cmd_line_buffer, char *rl) | |
b5a0ac70 | 490 | { |
b69d38af PA |
491 | char *cmd; |
492 | size_t len; | |
b5a0ac70 | 493 | |
b69d38af | 494 | len = strlen (rl); |
b5a0ac70 | 495 | |
b69d38af | 496 | if (len > 0 && rl[len - 1] == '\\') |
b5a0ac70 | 497 | { |
b69d38af PA |
498 | /* Don't copy the backslash and wait for more. */ |
499 | buffer_grow (cmd_line_buffer, rl, len - 1); | |
500 | cmd = NULL; | |
b5a0ac70 | 501 | } |
b69d38af | 502 | else |
b5a0ac70 | 503 | { |
b69d38af PA |
504 | /* Copy whole line including terminating null, and we're |
505 | done. */ | |
506 | buffer_grow (cmd_line_buffer, rl, len + 1); | |
507 | cmd = cmd_line_buffer->buffer; | |
b5a0ac70 SS |
508 | } |
509 | ||
b69d38af PA |
510 | /* Allocated in readline. */ |
511 | xfree (rl); | |
b5a0ac70 | 512 | |
b69d38af PA |
513 | return cmd; |
514 | } | |
b5a0ac70 | 515 | |
b69d38af | 516 | /* Handle a line of input coming from readline. |
b5a0ac70 | 517 | |
b69d38af PA |
518 | If the read line ends with a continuation character (backslash), |
519 | save the partial input in CMD_LINE_BUFFER (except the backslash), | |
520 | and return NULL. Otherwise, save the partial input and return a | |
521 | pointer to CMD_LINE_BUFFER's buffer (null terminated), indicating a | |
522 | whole command line is ready to be executed. | |
b5a0ac70 | 523 | |
b69d38af | 524 | Returns EOF on end of file. |
b5a0ac70 | 525 | |
b69d38af | 526 | If REPEAT, handle command repetitions: |
b5a0ac70 | 527 | |
b69d38af PA |
528 | - If the input command line is NOT empty, the command returned is |
529 | copied into the global 'saved_command_line' var so that it can | |
530 | be repeated later. | |
d96429cd | 531 | |
b69d38af PA |
532 | - OTOH, if the input command line IS empty, return the previously |
533 | saved command instead of the empty input line. | |
534 | */ | |
b5a0ac70 | 535 | |
b69d38af PA |
536 | char * |
537 | handle_line_of_input (struct buffer *cmd_line_buffer, | |
538 | char *rl, int repeat, char *annotation_suffix) | |
539 | { | |
540 | char *p1; | |
541 | char *cmd; | |
542 | ||
543 | if (rl == NULL) | |
544 | return (char *) EOF; | |
545 | ||
546 | cmd = command_line_append_input_line (cmd_line_buffer, rl); | |
547 | if (cmd == NULL) | |
548 | return NULL; | |
b5a0ac70 | 549 | |
b69d38af PA |
550 | /* We have a complete command line now. Prepare for the next |
551 | command, but leave ownership of memory to the buffer . */ | |
552 | cmd_line_buffer->used_size = 0; | |
553 | ||
554 | if (annotation_level > 1 && instream == stdin) | |
b5a0ac70 | 555 | { |
b69d38af PA |
556 | printf_unfiltered (("\n\032\032post-")); |
557 | puts_unfiltered (annotation_suffix); | |
558 | printf_unfiltered (("\n")); | |
559 | } | |
560 | ||
561 | #define SERVER_COMMAND_PREFIX "server " | |
562 | if (startswith (cmd, SERVER_COMMAND_PREFIX)) | |
563 | { | |
564 | /* Note that we don't set `saved_command_line'. Between this | |
565 | and the check in dont_repeat, this insures that repeating | |
566 | will still do the right thing. */ | |
567 | return cmd + strlen (SERVER_COMMAND_PREFIX); | |
b5a0ac70 SS |
568 | } |
569 | ||
570 | /* Do history expansion if that is wished. */ | |
571 | if (history_expansion_p && instream == stdin | |
572 | && ISATTY (instream)) | |
573 | { | |
574 | char *history_value; | |
575 | int expanded; | |
576 | ||
b69d38af | 577 | expanded = history_expand (cmd, &history_value); |
b5a0ac70 SS |
578 | if (expanded) |
579 | { | |
b69d38af PA |
580 | size_t len; |
581 | ||
b5a0ac70 SS |
582 | /* Print the changes. */ |
583 | printf_unfiltered ("%s\n", history_value); | |
584 | ||
585 | /* If there was an error, call this function again. */ | |
586 | if (expanded < 0) | |
587 | { | |
b8c9b27d | 588 | xfree (history_value); |
b69d38af | 589 | return cmd; |
b5a0ac70 | 590 | } |
b69d38af PA |
591 | |
592 | /* history_expand returns an allocated string. Just replace | |
593 | our buffer with it. */ | |
594 | len = strlen (history_value); | |
595 | xfree (buffer_finish (cmd_line_buffer)); | |
596 | cmd_line_buffer->buffer = history_value; | |
597 | cmd_line_buffer->buffer_size = len + 1; | |
598 | cmd = history_value; | |
b5a0ac70 SS |
599 | } |
600 | } | |
601 | ||
371d5dec | 602 | /* If we just got an empty line, and that is supposed to repeat the |
b69d38af PA |
603 | previous command, return the previously saved command. */ |
604 | for (p1 = cmd; *p1 == ' ' || *p1 == '\t'; p1++) | |
605 | ; | |
606 | if (repeat && *p1 == '\0') | |
607 | return saved_command_line; | |
608 | ||
609 | /* Add command to history if appropriate. Note: lines consisting | |
610 | solely of comments are also added to the command history. This | |
611 | is useful when you type a command, and then realize you don't | |
612 | want to execute it quite yet. You can comment out the command | |
613 | and then later fetch it from the value history and remove the | |
614 | '#'. The kill ring is probably better, but some people are in | |
615 | the habit of commenting things out. */ | |
616 | if (*cmd != '\0' && input_from_terminal_p ()) | |
617 | gdb_add_history (cmd); | |
b5a0ac70 | 618 | |
b69d38af PA |
619 | /* Save into global buffer if appropriate. */ |
620 | if (repeat) | |
b5a0ac70 | 621 | { |
b69d38af PA |
622 | xfree (saved_command_line); |
623 | saved_command_line = xstrdup (cmd); | |
624 | return saved_command_line; | |
b5a0ac70 | 625 | } |
b69d38af PA |
626 | else |
627 | return cmd; | |
628 | } | |
b5a0ac70 | 629 | |
b69d38af PA |
630 | /* Handle a complete line of input. This is called by the callback |
631 | mechanism within the readline library. Deal with incomplete | |
632 | commands as well, by saving the partial input in a global | |
633 | buffer. | |
b5a0ac70 | 634 | |
b69d38af PA |
635 | NOTE: This is the asynchronous version of the command_line_input |
636 | function. */ | |
b5a0ac70 | 637 | |
b69d38af PA |
638 | void |
639 | command_line_handler (char *rl) | |
640 | { | |
641 | struct buffer *line_buffer = get_command_line_buffer (); | |
642 | char *cmd; | |
b5a0ac70 | 643 | |
b69d38af PA |
644 | cmd = handle_line_of_input (line_buffer, rl, instream == stdin, "prompt"); |
645 | if (cmd == (char *) EOF) | |
b5a0ac70 | 646 | { |
b69d38af PA |
647 | /* stdin closed. The connection with the terminal is gone. |
648 | This happens at the end of a testsuite run, after Expect has | |
649 | hung up but GDB is still alive. In such a case, we just quit | |
650 | gdb killing the inferior program too. */ | |
651 | printf_unfiltered ("quit\n"); | |
652 | execute_command ("quit", stdin == instream); | |
653 | } | |
654 | else if (cmd == NULL) | |
655 | { | |
656 | /* We don't have a full line yet. Print an empty prompt. */ | |
657 | display_gdb_prompt (""); | |
658 | } | |
659 | else | |
660 | { | |
661 | command_handler (cmd); | |
662 | display_gdb_prompt (0); | |
b5a0ac70 | 663 | } |
b5a0ac70 SS |
664 | } |
665 | ||
666 | /* Does reading of input from terminal w/o the editing features | |
c70061cf PA |
667 | provided by the readline library. Calls the line input handler |
668 | once we have a whole input line. */ | |
b5a0ac70 | 669 | |
085dd6e6 | 670 | void |
c70061cf | 671 | gdb_readline_no_editing_callback (gdb_client_data client_data) |
b5a0ac70 SS |
672 | { |
673 | int c; | |
674 | char *result; | |
187212b3 | 675 | struct buffer line_buffer; |
7be570e7 JM |
676 | static int done_once = 0; |
677 | ||
187212b3 PA |
678 | buffer_init (&line_buffer); |
679 | ||
7be570e7 | 680 | /* Unbuffer the input stream, so that, later on, the calls to fgetc |
371d5dec | 681 | fetch only one char at the time from the stream. The fgetc's will |
7be570e7 | 682 | get up to the first newline, but there may be more chars in the |
371d5dec | 683 | stream after '\n'. If we buffer the input and fgetc drains the |
7be570e7 | 684 | stream, getting stuff beyond the newline as well, a select, done |
371d5dec | 685 | afterwards will not trigger. */ |
7be570e7 JM |
686 | if (!done_once && !ISATTY (instream)) |
687 | { | |
688 | setbuf (instream, NULL); | |
689 | done_once = 1; | |
690 | } | |
b5a0ac70 | 691 | |
b5a0ac70 | 692 | /* We still need the while loop here, even though it would seem |
c70061cf PA |
693 | obvious to invoke gdb_readline_no_editing_callback at every |
694 | character entered. If not using the readline library, the | |
695 | terminal is in cooked mode, which sends the characters all at | |
696 | once. Poll will notice that the input fd has changed state only | |
697 | after enter is pressed. At this point we still need to fetch all | |
698 | the chars entered. */ | |
b5a0ac70 SS |
699 | |
700 | while (1) | |
701 | { | |
702 | /* Read from stdin if we are executing a user defined command. | |
703 | This is the right thing for prompt_for_continue, at least. */ | |
704 | c = fgetc (instream ? instream : stdin); | |
705 | ||
706 | if (c == EOF) | |
707 | { | |
187212b3 PA |
708 | if (line_buffer.used_size > 0) |
709 | { | |
710 | /* The last line does not end with a newline. Return it, and | |
711 | if we are called again fgetc will still return EOF and | |
712 | we'll return NULL then. */ | |
713 | break; | |
714 | } | |
715 | xfree (buffer_finish (&line_buffer)); | |
0f71a2f6 | 716 | (*input_handler) (0); |
13ce7133 | 717 | return; |
b5a0ac70 SS |
718 | } |
719 | ||
720 | if (c == '\n') | |
b5a0ac70 | 721 | { |
187212b3 PA |
722 | if (line_buffer.used_size > 0 |
723 | && line_buffer.buffer[line_buffer.used_size - 1] == '\r') | |
724 | line_buffer.used_size--; | |
b5a0ac70 SS |
725 | break; |
726 | } | |
b5a0ac70 | 727 | |
187212b3 | 728 | buffer_grow_char (&line_buffer, c); |
b5a0ac70 SS |
729 | } |
730 | ||
187212b3 PA |
731 | buffer_grow_char (&line_buffer, '\0'); |
732 | result = buffer_finish (&line_buffer); | |
0f71a2f6 | 733 | (*input_handler) (result); |
b5a0ac70 SS |
734 | } |
735 | \f | |
736 | ||
f0881b37 PA |
737 | /* The serial event associated with the QUIT flag. set_quit_flag sets |
738 | this, and check_quit_flag clears it. Used by interruptible_select | |
739 | to be able to do interruptible I/O with no race with the SIGINT | |
740 | handler. */ | |
741 | static struct serial_event *quit_serial_event; | |
742 | ||
b5a0ac70 | 743 | /* Initialization of signal handlers and tokens. There is a function |
371d5dec | 744 | handle_sig* for each of the signals GDB cares about. Specifically: |
b5a0ac70 SS |
745 | SIGINT, SIGFPE, SIGQUIT, SIGTSTP, SIGHUP, SIGWINCH. These |
746 | functions are the actual signal handlers associated to the signals | |
747 | via calls to signal(). The only job for these functions is to | |
748 | enqueue the appropriate event/procedure with the event loop. Such | |
371d5dec | 749 | procedures are the old signal handlers. The event loop will take |
b5a0ac70 | 750 | care of invoking the queued procedures to perform the usual tasks |
371d5dec | 751 | associated with the reception of the signal. */ |
392a587b | 752 | /* NOTE: 1999-04-30 This is the asynchronous version of init_signals. |
b5a0ac70 | 753 | init_signals will become obsolete as we move to have to event loop |
371d5dec | 754 | as the default for gdb. */ |
b5a0ac70 | 755 | void |
c2c6d25f | 756 | async_init_signals (void) |
c5aa993b | 757 | { |
5cc3ce8b PA |
758 | initialize_async_signal_handlers (); |
759 | ||
f0881b37 PA |
760 | quit_serial_event = make_serial_event (); |
761 | ||
b5a0ac70 SS |
762 | signal (SIGINT, handle_sigint); |
763 | sigint_token = | |
0f71a2f6 | 764 | create_async_signal_handler (async_request_quit, NULL); |
a7266fef | 765 | signal (SIGTERM, handle_sigterm); |
06c868a8 JK |
766 | async_sigterm_token |
767 | = create_async_signal_handler (async_sigterm_handler, NULL); | |
b5a0ac70 SS |
768 | |
769 | /* If SIGTRAP was set to SIG_IGN, then the SIG_IGN will get passed | |
770 | to the inferior and breakpoints will be ignored. */ | |
771 | #ifdef SIGTRAP | |
772 | signal (SIGTRAP, SIG_DFL); | |
773 | #endif | |
774 | ||
6d318c73 | 775 | #ifdef SIGQUIT |
b5a0ac70 SS |
776 | /* If we initialize SIGQUIT to SIG_IGN, then the SIG_IGN will get |
777 | passed to the inferior, which we don't want. It would be | |
778 | possible to do a "signal (SIGQUIT, SIG_DFL)" after we fork, but | |
779 | on BSD4.3 systems using vfork, that can affect the | |
780 | GDB process as well as the inferior (the signal handling tables | |
781 | might be in memory, shared between the two). Since we establish | |
782 | a handler for SIGQUIT, when we call exec it will set the signal | |
783 | to SIG_DFL for us. */ | |
784 | signal (SIGQUIT, handle_sigquit); | |
785 | sigquit_token = | |
0f71a2f6 | 786 | create_async_signal_handler (async_do_nothing, NULL); |
6d318c73 | 787 | #endif |
b5a0ac70 SS |
788 | #ifdef SIGHUP |
789 | if (signal (SIGHUP, handle_sighup) != SIG_IGN) | |
790 | sighup_token = | |
0f71a2f6 | 791 | create_async_signal_handler (async_disconnect, NULL); |
b5a0ac70 SS |
792 | else |
793 | sighup_token = | |
0f71a2f6 | 794 | create_async_signal_handler (async_do_nothing, NULL); |
b5a0ac70 SS |
795 | #endif |
796 | signal (SIGFPE, handle_sigfpe); | |
797 | sigfpe_token = | |
0f71a2f6 | 798 | create_async_signal_handler (async_float_handler, NULL); |
b5a0ac70 | 799 | |
0f71a2f6 JM |
800 | #ifdef STOP_SIGNAL |
801 | sigtstp_token = | |
802 | create_async_signal_handler (async_stop_sig, NULL); | |
803 | #endif | |
0f71a2f6 JM |
804 | } |
805 | ||
f0881b37 PA |
806 | /* See defs.h. */ |
807 | ||
808 | void | |
809 | quit_serial_event_set (void) | |
810 | { | |
811 | serial_event_set (quit_serial_event); | |
812 | } | |
813 | ||
814 | /* See defs.h. */ | |
815 | ||
816 | void | |
817 | quit_serial_event_clear (void) | |
818 | { | |
819 | serial_event_clear (quit_serial_event); | |
820 | } | |
821 | ||
822 | /* Return the selectable file descriptor of the serial event | |
823 | associated with the quit flag. */ | |
824 | ||
825 | static int | |
826 | quit_serial_event_fd (void) | |
827 | { | |
828 | return serial_event_fd (quit_serial_event); | |
829 | } | |
830 | ||
831 | /* Handle a SIGINT. */ | |
832 | ||
c5aa993b | 833 | void |
c2c6d25f | 834 | handle_sigint (int sig) |
b5a0ac70 SS |
835 | { |
836 | signal (sig, handle_sigint); | |
837 | ||
5f960e00 FF |
838 | /* We could be running in a loop reading in symfiles or something so |
839 | it may be quite a while before we get back to the event loop. So | |
371d5dec | 840 | set quit_flag to 1 here. Then if QUIT is called before we get to |
5f960e00 FF |
841 | the event loop, we will unwind as expected. */ |
842 | ||
522002f9 | 843 | set_quit_flag (); |
5f960e00 | 844 | |
b5a0ac70 | 845 | /* If immediate_quit is set, we go ahead and process the SIGINT right |
371d5dec | 846 | away, even if we usually would defer this to the event loop. The |
b5a0ac70 | 847 | assumption here is that it is safe to process ^C immediately if |
371d5dec | 848 | immediate_quit is set. If we didn't, SIGINT would be really |
b5a0ac70 SS |
849 | processed only the next time through the event loop. To get to |
850 | that point, though, the command that we want to interrupt needs to | |
b803fb0f | 851 | finish first, which is unacceptable. If immediate quit is not set, |
371d5dec | 852 | we process SIGINT the next time through the loop, which is fine. */ |
b803fb0f | 853 | gdb_call_async_signal_handler (sigint_token, immediate_quit); |
b5a0ac70 SS |
854 | } |
855 | ||
f0881b37 PA |
856 | /* See gdb_select.h. */ |
857 | ||
858 | int | |
859 | interruptible_select (int n, | |
860 | fd_set *readfds, fd_set *writefds, fd_set *exceptfds, | |
861 | struct timeval *timeout) | |
862 | { | |
863 | fd_set my_readfds; | |
864 | int fd; | |
865 | int res; | |
866 | ||
867 | if (readfds == NULL) | |
868 | { | |
869 | readfds = &my_readfds; | |
870 | FD_ZERO (&my_readfds); | |
871 | } | |
872 | ||
873 | fd = quit_serial_event_fd (); | |
874 | FD_SET (fd, readfds); | |
875 | if (n <= fd) | |
876 | n = fd + 1; | |
877 | ||
878 | do | |
879 | { | |
880 | res = gdb_select (n, readfds, writefds, exceptfds, timeout); | |
881 | } | |
882 | while (res == -1 && errno == EINTR); | |
883 | ||
884 | if (res == 1 && FD_ISSET (fd, readfds)) | |
885 | { | |
886 | errno = EINTR; | |
887 | return -1; | |
888 | } | |
889 | return res; | |
890 | } | |
891 | ||
06c868a8 JK |
892 | /* Handle GDB exit upon receiving SIGTERM if target_can_async_p (). */ |
893 | ||
894 | static void | |
895 | async_sigterm_handler (gdb_client_data arg) | |
896 | { | |
897 | quit_force (NULL, stdin == instream); | |
898 | } | |
899 | ||
900 | /* See defs.h. */ | |
901 | volatile int sync_quit_force_run; | |
902 | ||
a7266fef AS |
903 | /* Quit GDB if SIGTERM is received. |
904 | GDB would quit anyway, but this way it will clean up properly. */ | |
905 | void | |
906 | handle_sigterm (int sig) | |
907 | { | |
908 | signal (sig, handle_sigterm); | |
06c868a8 | 909 | |
077836f7 PP |
910 | sync_quit_force_run = 1; |
911 | set_quit_flag (); | |
912 | ||
913 | mark_async_signal_handler (async_sigterm_token); | |
a7266fef AS |
914 | } |
915 | ||
371d5dec | 916 | /* Do the quit. All the checks have been done by the caller. */ |
c5aa993b | 917 | void |
c2c6d25f | 918 | async_request_quit (gdb_client_data arg) |
b5a0ac70 | 919 | { |
5f960e00 | 920 | /* If the quit_flag has gotten reset back to 0 by the time we get |
4ac94eda FF |
921 | back here, that means that an exception was thrown to unwind the |
922 | current command before we got back to the event loop. So there | |
522002f9 | 923 | is no reason to call quit again here. */ |
5f960e00 | 924 | |
522002f9 | 925 | if (check_quit_flag ()) |
4ac94eda | 926 | quit (); |
b5a0ac70 SS |
927 | } |
928 | ||
6d318c73 | 929 | #ifdef SIGQUIT |
371d5dec MS |
930 | /* Tell the event loop what to do if SIGQUIT is received. |
931 | See event-signal.c. */ | |
c5aa993b | 932 | static void |
c2c6d25f | 933 | handle_sigquit (int sig) |
b5a0ac70 | 934 | { |
f6fbab7d | 935 | mark_async_signal_handler (sigquit_token); |
b5a0ac70 SS |
936 | signal (sig, handle_sigquit); |
937 | } | |
6d318c73 | 938 | #endif |
b5a0ac70 | 939 | |
0f0b8dcd DJ |
940 | #if defined (SIGQUIT) || defined (SIGHUP) |
941 | /* Called by the event loop in response to a SIGQUIT or an | |
942 | ignored SIGHUP. */ | |
c5aa993b | 943 | static void |
c2c6d25f | 944 | async_do_nothing (gdb_client_data arg) |
b5a0ac70 | 945 | { |
371d5dec | 946 | /* Empty function body. */ |
b5a0ac70 | 947 | } |
0f0b8dcd | 948 | #endif |
b5a0ac70 SS |
949 | |
950 | #ifdef SIGHUP | |
371d5dec MS |
951 | /* Tell the event loop what to do if SIGHUP is received. |
952 | See event-signal.c. */ | |
c5aa993b | 953 | static void |
fba45db2 | 954 | handle_sighup (int sig) |
b5a0ac70 | 955 | { |
f6fbab7d | 956 | mark_async_signal_handler (sighup_token); |
b5a0ac70 SS |
957 | signal (sig, handle_sighup); |
958 | } | |
959 | ||
371d5dec | 960 | /* Called by the event loop to process a SIGHUP. */ |
c5aa993b | 961 | static void |
c2c6d25f | 962 | async_disconnect (gdb_client_data arg) |
b5a0ac70 | 963 | { |
b2cd6b29 | 964 | |
492d29ea | 965 | TRY |
b2cd6b29 JM |
966 | { |
967 | quit_cover (); | |
968 | } | |
969 | ||
492d29ea | 970 | CATCH (exception, RETURN_MASK_ALL) |
b2cd6b29 JM |
971 | { |
972 | fputs_filtered ("Could not kill the program being debugged", | |
973 | gdb_stderr); | |
974 | exception_print (gdb_stderr, exception); | |
975 | } | |
492d29ea | 976 | END_CATCH |
b2cd6b29 | 977 | |
492d29ea | 978 | TRY |
b2cd6b29 | 979 | { |
460014f5 | 980 | pop_all_targets (); |
b2cd6b29 | 981 | } |
492d29ea PA |
982 | CATCH (exception, RETURN_MASK_ALL) |
983 | { | |
984 | } | |
985 | END_CATCH | |
b2cd6b29 | 986 | |
371d5dec | 987 | signal (SIGHUP, SIG_DFL); /*FIXME: ??????????? */ |
ec4dfccf | 988 | raise (SIGHUP); |
b5a0ac70 SS |
989 | } |
990 | #endif | |
991 | ||
0f71a2f6 | 992 | #ifdef STOP_SIGNAL |
c5aa993b | 993 | void |
c2c6d25f | 994 | handle_stop_sig (int sig) |
0f71a2f6 | 995 | { |
f6fbab7d | 996 | mark_async_signal_handler (sigtstp_token); |
c5aa993b | 997 | signal (sig, handle_stop_sig); |
0f71a2f6 JM |
998 | } |
999 | ||
1000 | static void | |
c2c6d25f | 1001 | async_stop_sig (gdb_client_data arg) |
0f71a2f6 | 1002 | { |
ab821bc6 | 1003 | char *prompt = get_prompt (); |
d7f9d729 | 1004 | |
0f71a2f6 JM |
1005 | #if STOP_SIGNAL == SIGTSTP |
1006 | signal (SIGTSTP, SIG_DFL); | |
2acceee2 JM |
1007 | #if HAVE_SIGPROCMASK |
1008 | { | |
1009 | sigset_t zero; | |
46711df8 | 1010 | |
2acceee2 JM |
1011 | sigemptyset (&zero); |
1012 | sigprocmask (SIG_SETMASK, &zero, 0); | |
1013 | } | |
46711df8 | 1014 | #elif HAVE_SIGSETMASK |
0f71a2f6 | 1015 | sigsetmask (0); |
2acceee2 | 1016 | #endif |
ec4dfccf | 1017 | raise (SIGTSTP); |
0f71a2f6 JM |
1018 | signal (SIGTSTP, handle_stop_sig); |
1019 | #else | |
1020 | signal (STOP_SIGNAL, handle_stop_sig); | |
1021 | #endif | |
1022 | printf_unfiltered ("%s", prompt); | |
1023 | gdb_flush (gdb_stdout); | |
1024 | ||
371d5dec MS |
1025 | /* Forget about any previous command -- null line now will do |
1026 | nothing. */ | |
0f71a2f6 JM |
1027 | dont_repeat (); |
1028 | } | |
1029 | #endif /* STOP_SIGNAL */ | |
1030 | ||
371d5dec MS |
1031 | /* Tell the event loop what to do if SIGFPE is received. |
1032 | See event-signal.c. */ | |
c5aa993b | 1033 | static void |
c2c6d25f | 1034 | handle_sigfpe (int sig) |
b5a0ac70 | 1035 | { |
f6fbab7d | 1036 | mark_async_signal_handler (sigfpe_token); |
b5a0ac70 SS |
1037 | signal (sig, handle_sigfpe); |
1038 | } | |
1039 | ||
371d5dec | 1040 | /* Event loop will call this functin to process a SIGFPE. */ |
c5aa993b | 1041 | static void |
c2c6d25f | 1042 | async_float_handler (gdb_client_data arg) |
b5a0ac70 | 1043 | { |
371d5dec MS |
1044 | /* This message is based on ANSI C, section 4.7. Note that integer |
1045 | divide by zero causes this, so "float" is a misnomer. */ | |
8a3fe4f8 | 1046 | error (_("Erroneous arithmetic operation.")); |
b5a0ac70 | 1047 | } |
b5a0ac70 SS |
1048 | \f |
1049 | ||
1050 | /* Called by do_setshow_command. */ | |
b5a0ac70 | 1051 | void |
371d5dec MS |
1052 | set_async_editing_command (char *args, int from_tty, |
1053 | struct cmd_list_element *c) | |
b5a0ac70 SS |
1054 | { |
1055 | change_line_handler (); | |
1056 | } | |
1057 | ||
0f71a2f6 JM |
1058 | /* Set things up for readline to be invoked via the alternate |
1059 | interface, i.e. via a callback function (rl_callback_read_char), | |
371d5dec | 1060 | and hook up instream to the event loop. */ |
0f71a2f6 | 1061 | void |
cee6ddeb | 1062 | gdb_setup_readline (void) |
0f71a2f6 | 1063 | { |
362646f5 AC |
1064 | /* This function is a noop for the sync case. The assumption is |
1065 | that the sync setup is ALL done in gdb_init, and we would only | |
1066 | mess it up here. The sync stuff should really go away over | |
1067 | time. */ | |
1a088d06 AS |
1068 | if (!batch_silent) |
1069 | gdb_stdout = stdio_fileopen (stdout); | |
ffa4ac95 | 1070 | gdb_stderr = stderr_fileopen (); |
362646f5 AC |
1071 | gdb_stdlog = gdb_stderr; /* for moment */ |
1072 | gdb_stdtarg = gdb_stderr; /* for moment */ | |
8d4d924b | 1073 | gdb_stdtargerr = gdb_stderr; /* for moment */ |
362646f5 AC |
1074 | |
1075 | /* If the input stream is connected to a terminal, turn on | |
1076 | editing. */ | |
1077 | if (ISATTY (instream)) | |
9e0b60a8 | 1078 | { |
371d5dec | 1079 | /* Tell gdb that we will be using the readline library. This |
362646f5 AC |
1080 | could be overwritten by a command in .gdbinit like 'set |
1081 | editing on' or 'off'. */ | |
1082 | async_command_editing_p = 1; | |
c5201926 | 1083 | |
362646f5 AC |
1084 | /* When a character is detected on instream by select or poll, |
1085 | readline will be invoked via this callback function. */ | |
1086 | call_readline = rl_callback_read_char_wrapper; | |
9e0b60a8 | 1087 | } |
362646f5 AC |
1088 | else |
1089 | { | |
1090 | async_command_editing_p = 0; | |
c70061cf | 1091 | call_readline = gdb_readline_no_editing_callback; |
362646f5 AC |
1092 | } |
1093 | ||
1094 | /* When readline has read an end-of-line character, it passes the | |
371d5dec | 1095 | complete line to gdb for processing; command_line_handler is the |
362646f5 AC |
1096 | function that does this. */ |
1097 | input_handler = command_line_handler; | |
1098 | ||
371d5dec | 1099 | /* Tell readline to use the same input stream that gdb uses. */ |
362646f5 AC |
1100 | rl_instream = instream; |
1101 | ||
1102 | /* Get a file descriptor for the input stream, so that we can | |
1103 | register it with the event loop. */ | |
1104 | input_fd = fileno (instream); | |
1105 | ||
1106 | /* Now we need to create the event sources for the input file | |
1107 | descriptor. */ | |
1108 | /* At this point in time, this is the only event source that we | |
371d5dec | 1109 | register with the even loop. Another source is going to be the |
362646f5 AC |
1110 | target program (inferior), but that must be registered only when |
1111 | it actually exists (I.e. after we say 'run' or after we connect | |
1112 | to a remote target. */ | |
1113 | add_file_handler (input_fd, stdin_event_handler, 0); | |
0f71a2f6 | 1114 | } |
cee6ddeb | 1115 | |
7d5b6fdd EZ |
1116 | /* Disable command input through the standard CLI channels. Used in |
1117 | the suspend proc for interpreters that use the standard gdb readline | |
1118 | interface, like the cli & the mi. */ | |
1119 | void | |
1120 | gdb_disable_readline (void) | |
1121 | { | |
362646f5 AC |
1122 | /* FIXME - It is too heavyweight to delete and remake these every |
1123 | time you run an interpreter that needs readline. It is probably | |
1124 | better to have the interpreters cache these, which in turn means | |
1125 | that this needs to be moved into interpreter specific code. */ | |
7d5b6fdd EZ |
1126 | |
1127 | #if 0 | |
362646f5 AC |
1128 | ui_file_delete (gdb_stdout); |
1129 | ui_file_delete (gdb_stderr); | |
1130 | gdb_stdlog = NULL; | |
1131 | gdb_stdtarg = NULL; | |
8d4d924b | 1132 | gdb_stdtargerr = NULL; |
7d5b6fdd EZ |
1133 | #endif |
1134 | ||
d3d4baed | 1135 | gdb_rl_callback_handler_remove (); |
362646f5 | 1136 | delete_file_handler (input_fd); |
7d5b6fdd | 1137 | } |