Commit | Line | Data |
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b5a0ac70 | 1 | /* Top level stuff for GDB, the GNU debugger. |
637537d0 | 2 | |
ecd75fc8 | 3 | Copyright (C) 1999-2014 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" |
104c1213 | 40 | |
371d5dec | 41 | /* readline include files. */ |
dbda9972 AC |
42 | #include "readline/readline.h" |
43 | #include "readline/history.h" | |
b5a0ac70 SS |
44 | |
45 | /* readline defines this. */ | |
46 | #undef savestring | |
47 | ||
c2c6d25f JM |
48 | static void rl_callback_read_char_wrapper (gdb_client_data client_data); |
49 | static void command_line_handler (char *rl); | |
c2c6d25f | 50 | static void change_line_handler (void); |
c2c6d25f | 51 | static void command_handler (char *command); |
ab821bc6 | 52 | static char *top_level_prompt (void); |
b5a0ac70 | 53 | |
371d5dec | 54 | /* Signal handlers. */ |
6d318c73 | 55 | #ifdef SIGQUIT |
c2c6d25f | 56 | static void handle_sigquit (int sig); |
6d318c73 | 57 | #endif |
0f0b8dcd | 58 | #ifdef SIGHUP |
c2c6d25f | 59 | static void handle_sighup (int sig); |
0f0b8dcd | 60 | #endif |
c2c6d25f | 61 | static void handle_sigfpe (int sig); |
b5a0ac70 SS |
62 | |
63 | /* Functions to be invoked by the event loop in response to | |
371d5dec | 64 | signals. */ |
0f0b8dcd | 65 | #if defined (SIGQUIT) || defined (SIGHUP) |
c2c6d25f | 66 | static void async_do_nothing (gdb_client_data); |
0f0b8dcd DJ |
67 | #endif |
68 | #ifdef SIGHUP | |
c2c6d25f | 69 | static void async_disconnect (gdb_client_data); |
0f0b8dcd | 70 | #endif |
c2c6d25f | 71 | static void async_float_handler (gdb_client_data); |
0f0b8dcd | 72 | #ifdef STOP_SIGNAL |
c2c6d25f | 73 | static void async_stop_sig (gdb_client_data); |
0f0b8dcd | 74 | #endif |
06c868a8 | 75 | static void async_sigterm_handler (gdb_client_data arg); |
b5a0ac70 | 76 | |
b5a0ac70 | 77 | /* Readline offers an alternate interface, via callback |
371d5dec | 78 | functions. These are all included in the file callback.c in the |
b5a0ac70 SS |
79 | readline distribution. This file provides (mainly) a function, which |
80 | the event loop uses as callback (i.e. event handler) whenever an event | |
81 | is detected on the standard input file descriptor. | |
82 | readline_callback_read_char is called (by the GDB event loop) whenever | |
371d5dec | 83 | there is a new character ready on the input stream. This function |
b5a0ac70 SS |
84 | incrementally builds a buffer internal to readline where it |
85 | accumulates the line read up to the point of invocation. In the | |
86 | special case in which the character read is newline, the function | |
87 | invokes a GDB supplied callback routine, which does the processing of | |
88 | a full command line. This latter routine is the asynchronous analog | |
371d5dec | 89 | of the old command_line_input in gdb. Instead of invoking (and waiting |
b5a0ac70 SS |
90 | for) readline to read the command line and pass it back to |
91 | command_loop for processing, the new command_line_handler function has | |
92 | the command line already available as its parameter. INPUT_HANDLER is | |
93 | to be set to the function that readline will invoke when a complete | |
94 | line of input is ready. CALL_READLINE is to be set to the function | |
371d5dec | 95 | that readline offers as callback to the event_loop. */ |
b5a0ac70 | 96 | |
c2c6d25f JM |
97 | void (*input_handler) (char *); |
98 | void (*call_readline) (gdb_client_data); | |
b5a0ac70 | 99 | |
371d5dec | 100 | /* Important variables for the event loop. */ |
b5a0ac70 SS |
101 | |
102 | /* This is used to determine if GDB is using the readline library or | |
371d5dec | 103 | its own simplified form of readline. It is used by the asynchronous |
0f71a2f6 | 104 | form of the set editing command. |
392a587b | 105 | ezannoni: as of 1999-04-29 I expect that this |
b5a0ac70 | 106 | variable will not be used after gdb is changed to use the event |
371d5dec | 107 | loop as default engine, and event-top.c is merged into top.c. */ |
b5a0ac70 SS |
108 | int async_command_editing_p; |
109 | ||
b5a0ac70 | 110 | /* This is the annotation suffix that will be used when the |
371d5dec | 111 | annotation_level is 2. */ |
b5a0ac70 SS |
112 | char *async_annotation_suffix; |
113 | ||
104c1213 | 114 | /* This is used to display the notification of the completion of an |
371d5dec | 115 | asynchronous execution command. */ |
104c1213 JM |
116 | int exec_done_display_p = 0; |
117 | ||
b5a0ac70 | 118 | /* This is the file descriptor for the input stream that GDB uses to |
371d5dec | 119 | read commands from. */ |
b5a0ac70 SS |
120 | int input_fd; |
121 | ||
371d5dec | 122 | /* Signal handling variables. */ |
b5a0ac70 | 123 | /* Each of these is a pointer to a function that the event loop will |
371d5dec | 124 | invoke if the corresponding signal has received. The real signal |
b5a0ac70 | 125 | handlers mark these functions as ready to be executed and the event |
371d5dec MS |
126 | loop, in a later iteration, calls them. See the function |
127 | invoke_async_signal_handler. */ | |
05fa9251 | 128 | static struct async_signal_handler *sigint_token; |
b5a0ac70 | 129 | #ifdef SIGHUP |
05fa9251 | 130 | static struct async_signal_handler *sighup_token; |
b5a0ac70 | 131 | #endif |
6d318c73 | 132 | #ifdef SIGQUIT |
05fa9251 | 133 | static struct async_signal_handler *sigquit_token; |
6d318c73 | 134 | #endif |
05fa9251 | 135 | static struct async_signal_handler *sigfpe_token; |
0f71a2f6 | 136 | #ifdef STOP_SIGNAL |
05fa9251 | 137 | static struct async_signal_handler *sigtstp_token; |
0f71a2f6 | 138 | #endif |
06c868a8 | 139 | static struct async_signal_handler *async_sigterm_token; |
0f71a2f6 | 140 | |
b5a0ac70 | 141 | /* Structure to save a partially entered command. This is used when |
371d5dec | 142 | the user types '\' at the end of a command line. This is necessary |
b5a0ac70 SS |
143 | because each line of input is handled by a different call to |
144 | command_line_handler, and normally there is no state retained | |
371d5dec | 145 | between different calls. */ |
ab821bc6 | 146 | static int more_to_come = 0; |
b5a0ac70 SS |
147 | |
148 | struct readline_input_state | |
149 | { | |
150 | char *linebuffer; | |
151 | char *linebuffer_ptr; | |
152 | } | |
153 | readline_input_state; | |
467d8519 TT |
154 | |
155 | /* This hook is called by rl_callback_read_char_wrapper after each | |
156 | character is processed. */ | |
b08ee6a2 | 157 | void (*after_char_processing_hook) (void); |
b5a0ac70 SS |
158 | \f |
159 | ||
371d5dec MS |
160 | /* Wrapper function for calling into the readline library. The event |
161 | loop expects the callback function to have a paramter, while | |
162 | readline expects none. */ | |
c2c6d25f JM |
163 | static void |
164 | rl_callback_read_char_wrapper (gdb_client_data client_data) | |
165 | { | |
166 | rl_callback_read_char (); | |
467d8519 TT |
167 | if (after_char_processing_hook) |
168 | (*after_char_processing_hook) (); | |
c2c6d25f JM |
169 | } |
170 | ||
b5a0ac70 | 171 | /* Initialize all the necessary variables, start the event loop, |
4d09c5b4 AB |
172 | register readline, and stdin, start the loop. The DATA is the |
173 | interpreter data cookie, ignored for now. */ | |
174 | ||
b5a0ac70 | 175 | void |
4d09c5b4 | 176 | cli_command_loop (void *data) |
b5a0ac70 | 177 | { |
7d8e6458 | 178 | display_gdb_prompt (0); |
b5a0ac70 | 179 | |
371d5dec | 180 | /* Now it's time to start the event loop. */ |
085dd6e6 | 181 | start_event_loop (); |
b5a0ac70 SS |
182 | } |
183 | ||
184 | /* Change the function to be invoked every time there is a character | |
371d5dec | 185 | ready on stdin. This is used when the user sets the editing off, |
b5a0ac70 | 186 | therefore bypassing readline, and letting gdb handle the input |
371d5dec | 187 | itself, via gdb_readline2. Also it is used in the opposite case in |
b5a0ac70 | 188 | which the user sets editing on again, by restoring readline |
371d5dec | 189 | handling of the input. */ |
392a587b | 190 | static void |
c2c6d25f | 191 | change_line_handler (void) |
b5a0ac70 | 192 | { |
371d5dec MS |
193 | /* NOTE: this operates on input_fd, not instream. If we are reading |
194 | commands from a file, instream will point to the file. However in | |
c2c6d25f | 195 | async mode, we always read commands from a file with editing |
371d5dec MS |
196 | off. This means that the 'set editing on/off' will have effect |
197 | only on the interactive session. */ | |
c2c6d25f | 198 | |
b5a0ac70 SS |
199 | if (async_command_editing_p) |
200 | { | |
371d5dec | 201 | /* Turn on editing by using readline. */ |
c2c6d25f | 202 | call_readline = rl_callback_read_char_wrapper; |
0f71a2f6 | 203 | input_handler = command_line_handler; |
b5a0ac70 SS |
204 | } |
205 | else | |
206 | { | |
371d5dec | 207 | /* Turn off editing by using gdb_readline2. */ |
d3d4baed | 208 | gdb_rl_callback_handler_remove (); |
b5a0ac70 | 209 | call_readline = gdb_readline2; |
0f71a2f6 JM |
210 | |
211 | /* Set up the command handler as well, in case we are called as | |
371d5dec | 212 | first thing from .gdbinit. */ |
0f71a2f6 | 213 | input_handler = command_line_handler; |
b5a0ac70 | 214 | } |
b5a0ac70 SS |
215 | } |
216 | ||
d3d4baed PA |
217 | /* The functions below are wrappers for rl_callback_handler_remove and |
218 | rl_callback_handler_install that keep track of whether the callback | |
219 | handler is installed in readline. This is necessary because after | |
220 | handling a target event of a background execution command, we may | |
221 | need to reinstall the callback handler if it was removed due to a | |
222 | secondary prompt. See gdb_readline_wrapper_line. We don't | |
223 | unconditionally install the handler for every target event because | |
224 | that also clears the line buffer, thus installing it while the user | |
225 | is typing would lose input. */ | |
226 | ||
227 | /* Whether we've registered a callback handler with readline. */ | |
228 | static int callback_handler_installed; | |
229 | ||
230 | /* See event-top.h, and above. */ | |
231 | ||
232 | void | |
233 | gdb_rl_callback_handler_remove (void) | |
234 | { | |
235 | rl_callback_handler_remove (); | |
236 | callback_handler_installed = 0; | |
237 | } | |
238 | ||
239 | /* See event-top.h, and above. Note this wrapper doesn't have an | |
240 | actual callback parameter because we always install | |
241 | INPUT_HANDLER. */ | |
242 | ||
243 | void | |
244 | gdb_rl_callback_handler_install (const char *prompt) | |
245 | { | |
246 | /* Calling rl_callback_handler_install resets readline's input | |
247 | buffer. Calling this when we were already processing input | |
248 | therefore loses input. */ | |
249 | gdb_assert (!callback_handler_installed); | |
250 | ||
251 | rl_callback_handler_install (prompt, input_handler); | |
252 | callback_handler_installed = 1; | |
253 | } | |
254 | ||
255 | /* See event-top.h, and above. */ | |
256 | ||
257 | void | |
258 | gdb_rl_callback_handler_reinstall (void) | |
259 | { | |
260 | if (!callback_handler_installed) | |
261 | { | |
262 | /* Passing NULL as prompt argument tells readline to not display | |
263 | a prompt. */ | |
264 | gdb_rl_callback_handler_install (NULL); | |
265 | } | |
266 | } | |
267 | ||
ab821bc6 PA |
268 | /* Displays the prompt. If the argument NEW_PROMPT is NULL, the |
269 | prompt that is displayed is the current top level prompt. | |
270 | Otherwise, it displays whatever NEW_PROMPT is as a local/secondary | |
271 | prompt. | |
272 | ||
273 | This is used after each gdb command has completed, and in the | |
274 | following cases: | |
275 | ||
371d5dec | 276 | 1. When the user enters a command line which is ended by '\' |
ab821bc6 PA |
277 | indicating that the command will continue on the next line. In |
278 | that case the prompt that is displayed is the empty string. | |
279 | ||
0f71a2f6 | 280 | 2. When the user is entering 'commands' for a breakpoint, or |
371d5dec | 281 | actions for a tracepoint. In this case the prompt will be '>' |
ab821bc6 PA |
282 | |
283 | 3. On prompting for pagination. */ | |
284 | ||
b5a0ac70 | 285 | void |
c2c6d25f | 286 | display_gdb_prompt (char *new_prompt) |
b5a0ac70 | 287 | { |
d17b6f81 | 288 | char *actual_gdb_prompt = NULL; |
ab821bc6 | 289 | struct cleanup *old_chain; |
b5a0ac70 | 290 | |
bd00c694 PA |
291 | annotate_display_prompt (); |
292 | ||
16026cd7 AS |
293 | /* Reset the nesting depth used when trace-commands is set. */ |
294 | reset_command_nest_depth (); | |
295 | ||
ab821bc6 | 296 | old_chain = make_cleanup (free_current_contents, &actual_gdb_prompt); |
d17b6f81 | 297 | |
ab821bc6 PA |
298 | /* Do not call the python hook on an explicit prompt change as |
299 | passed to this function, as this forms a secondary/local prompt, | |
300 | IE, displayed but not set. */ | |
301 | if (! new_prompt) | |
adf40b2e | 302 | { |
ab821bc6 | 303 | if (sync_execution) |
d17b6f81 | 304 | { |
ab821bc6 PA |
305 | /* This is to trick readline into not trying to display the |
306 | prompt. Even though we display the prompt using this | |
307 | function, readline still tries to do its own display if | |
308 | we don't call rl_callback_handler_install and | |
309 | rl_callback_handler_remove (which readline detects | |
310 | because a global variable is not set). If readline did | |
311 | that, it could mess up gdb signal handlers for SIGINT. | |
312 | Readline assumes that between calls to rl_set_signals and | |
313 | rl_clear_signals gdb doesn't do anything with the signal | |
314 | handlers. Well, that's not the case, because when the | |
315 | target executes we change the SIGINT signal handler. If | |
316 | we allowed readline to display the prompt, the signal | |
317 | handler change would happen exactly between the calls to | |
318 | the above two functions. Calling | |
319 | rl_callback_handler_remove(), does the job. */ | |
320 | ||
d3d4baed | 321 | gdb_rl_callback_handler_remove (); |
faab9922 | 322 | do_cleanups (old_chain); |
ab821bc6 | 323 | return; |
d17b6f81 PM |
324 | } |
325 | else | |
ab821bc6 PA |
326 | { |
327 | /* Display the top level prompt. */ | |
328 | actual_gdb_prompt = top_level_prompt (); | |
329 | } | |
b5a0ac70 | 330 | } |
ab821bc6 PA |
331 | else |
332 | actual_gdb_prompt = xstrdup (new_prompt); | |
b5a0ac70 SS |
333 | |
334 | if (async_command_editing_p) | |
335 | { | |
d3d4baed PA |
336 | gdb_rl_callback_handler_remove (); |
337 | gdb_rl_callback_handler_install (actual_gdb_prompt); | |
b5a0ac70 | 338 | } |
371d5dec | 339 | /* new_prompt at this point can be the top of the stack or the one |
d014929c MS |
340 | passed in. It can't be NULL. */ |
341 | else | |
b5a0ac70 SS |
342 | { |
343 | /* Don't use a _filtered function here. It causes the assumed | |
344 | character position to be off, since the newline we read from | |
345 | the user is not accounted for. */ | |
d17b6f81 | 346 | fputs_unfiltered (actual_gdb_prompt, gdb_stdout); |
b5a0ac70 SS |
347 | gdb_flush (gdb_stdout); |
348 | } | |
ab821bc6 PA |
349 | |
350 | do_cleanups (old_chain); | |
b5a0ac70 SS |
351 | } |
352 | ||
ab821bc6 PA |
353 | /* Return the top level prompt, as specified by "set prompt", possibly |
354 | overriden by the python gdb.prompt_hook hook, and then composed | |
355 | with the prompt prefix and suffix (annotations). The caller is | |
356 | responsible for freeing the returned string. */ | |
357 | ||
358 | static char * | |
359 | top_level_prompt (void) | |
b5a0ac70 | 360 | { |
ab821bc6 PA |
361 | char *prefix; |
362 | char *prompt = NULL; | |
363 | char *suffix; | |
364 | char *composed_prompt; | |
365 | size_t prompt_length; | |
b5a0ac70 | 366 | |
ab821bc6 PA |
367 | /* Give observers a chance of changing the prompt. E.g., the python |
368 | `gdb.prompt_hook' is installed as an observer. */ | |
369 | observer_notify_before_prompt (get_prompt ()); | |
370 | ||
371 | prompt = xstrdup (get_prompt ()); | |
b5a0ac70 | 372 | |
ab821bc6 | 373 | if (annotation_level >= 2) |
b5a0ac70 | 374 | { |
ab821bc6 PA |
375 | /* Prefix needs to have new line at end. */ |
376 | prefix = (char *) alloca (strlen (async_annotation_suffix) + 10); | |
377 | strcpy (prefix, "\n\032\032pre-"); | |
378 | strcat (prefix, async_annotation_suffix); | |
379 | strcat (prefix, "\n"); | |
380 | ||
381 | /* Suffix needs to have a new line at end and \032 \032 at | |
382 | beginning. */ | |
383 | suffix = (char *) alloca (strlen (async_annotation_suffix) + 6); | |
384 | strcpy (suffix, "\n\032\032"); | |
385 | strcat (suffix, async_annotation_suffix); | |
386 | strcat (suffix, "\n"); | |
b5a0ac70 SS |
387 | } |
388 | else | |
389 | { | |
ab821bc6 PA |
390 | prefix = ""; |
391 | suffix = ""; | |
b5a0ac70 | 392 | } |
b5a0ac70 | 393 | |
ab821bc6 PA |
394 | prompt_length = strlen (prefix) + strlen (prompt) + strlen (suffix); |
395 | composed_prompt = xmalloc (prompt_length + 1); | |
b5a0ac70 | 396 | |
ab821bc6 PA |
397 | strcpy (composed_prompt, prefix); |
398 | strcat (composed_prompt, prompt); | |
399 | strcat (composed_prompt, suffix); | |
b5a0ac70 | 400 | |
ab821bc6 PA |
401 | xfree (prompt); |
402 | ||
403 | return composed_prompt; | |
b5a0ac70 | 404 | } |
c2c6d25f JM |
405 | |
406 | /* When there is an event ready on the stdin file desriptor, instead | |
407 | of calling readline directly throught the callback function, or | |
408 | instead of calling gdb_readline2, give gdb a chance to detect | |
371d5dec | 409 | errors and do something. */ |
c2c6d25f | 410 | void |
2acceee2 | 411 | stdin_event_handler (int error, gdb_client_data client_data) |
c2c6d25f JM |
412 | { |
413 | if (error) | |
414 | { | |
a3f17187 | 415 | printf_unfiltered (_("error detected on stdin\n")); |
2acceee2 | 416 | delete_file_handler (input_fd); |
c2c6d25f | 417 | discard_all_continuations (); |
604ead4a | 418 | discard_all_intermediate_continuations (); |
371d5dec | 419 | /* If stdin died, we may as well kill gdb. */ |
c5394b80 | 420 | quit_command ((char *) 0, stdin == instream); |
c2c6d25f JM |
421 | } |
422 | else | |
6426a772 | 423 | (*call_readline) (client_data); |
c2c6d25f JM |
424 | } |
425 | ||
6426a772 JM |
426 | /* Re-enable stdin after the end of an execution command in |
427 | synchronous mode, or after an error from the target, and we aborted | |
371d5dec | 428 | the exec operation. */ |
6426a772 JM |
429 | |
430 | void | |
712af3be | 431 | async_enable_stdin (void) |
6426a772 | 432 | { |
32c1e744 VP |
433 | if (sync_execution) |
434 | { | |
371d5dec | 435 | /* See NOTE in async_disable_stdin(). */ |
32c1e744 VP |
436 | /* FIXME: cagney/1999-09-27: Call this before clearing |
437 | sync_execution. Current target_terminal_ours() implementations | |
371d5dec | 438 | check for sync_execution before switching the terminal. */ |
32c1e744 | 439 | target_terminal_ours (); |
32c1e744 VP |
440 | sync_execution = 0; |
441 | } | |
6426a772 JM |
442 | } |
443 | ||
444 | /* Disable reads from stdin (the console) marking the command as | |
371d5dec | 445 | synchronous. */ |
6426a772 JM |
446 | |
447 | void | |
448 | async_disable_stdin (void) | |
449 | { | |
ab821bc6 | 450 | sync_execution = 1; |
6426a772 | 451 | } |
b5a0ac70 | 452 | \f |
6426a772 | 453 | |
371d5dec | 454 | /* Handles a gdb command. This function is called by |
b5a0ac70 | 455 | command_line_handler, which has processed one or more input lines |
371d5dec | 456 | into COMMAND. */ |
392a587b | 457 | /* NOTE: 1999-04-30 This is the asynchronous version of the command_loop |
b5a0ac70 | 458 | function. The command_loop function will be obsolete when we |
371d5dec | 459 | switch to use the event loop at every execution of gdb. */ |
392a587b | 460 | static void |
c2c6d25f | 461 | command_handler (char *command) |
b5a0ac70 | 462 | { |
b5a0ac70 | 463 | int stdin_is_tty = ISATTY (stdin); |
0f3bb72e | 464 | struct cleanup *stat_chain; |
b5a0ac70 | 465 | |
522002f9 | 466 | clear_quit_flag (); |
b5a0ac70 SS |
467 | if (instream == stdin && stdin_is_tty) |
468 | reinitialize_more_filter (); | |
b5a0ac70 | 469 | |
371d5dec MS |
470 | /* If readline returned a NULL command, it means that the connection |
471 | with the terminal is gone. This happens at the end of a | |
472 | testsuite run, after Expect has hung up but GDB is still alive. | |
473 | In such a case, we just quit gdb killing the inferior program | |
474 | too. */ | |
b5a0ac70 | 475 | if (command == 0) |
fa3fd85b AS |
476 | { |
477 | printf_unfiltered ("quit\n"); | |
478 | execute_command ("quit", stdin == instream); | |
479 | } | |
b5a0ac70 | 480 | |
0f3bb72e | 481 | stat_chain = make_command_stats_cleanup (1); |
b5a0ac70 SS |
482 | |
483 | execute_command (command, instream == stdin); | |
c5aa993b | 484 | |
347bddb7 PA |
485 | /* Do any commands attached to breakpoint we stopped at. */ |
486 | bpstat_do_actions (); | |
c5aa993b | 487 | |
0f3bb72e | 488 | do_cleanups (stat_chain); |
43ff13b4 JM |
489 | } |
490 | ||
371d5dec MS |
491 | /* Handle a complete line of input. This is called by the callback |
492 | mechanism within the readline library. Deal with incomplete | |
493 | commands as well, by saving the partial input in a global | |
494 | buffer. */ | |
b5a0ac70 | 495 | |
392a587b | 496 | /* NOTE: 1999-04-30 This is the asynchronous version of the |
371d5dec | 497 | command_line_input function; command_line_input will become |
b5a0ac70 | 498 | obsolete once we use the event loop as the default mechanism in |
371d5dec | 499 | GDB. */ |
b5a0ac70 | 500 | static void |
c2c6d25f | 501 | command_line_handler (char *rl) |
b5a0ac70 SS |
502 | { |
503 | static char *linebuffer = 0; | |
504 | static unsigned linelength = 0; | |
52f0bd74 | 505 | char *p; |
b5a0ac70 | 506 | char *p1; |
b5a0ac70 | 507 | char *nline; |
b5a0ac70 SS |
508 | int repeat = (instream == stdin); |
509 | ||
510 | if (annotation_level > 1 && instream == stdin) | |
511 | { | |
a3f17187 | 512 | printf_unfiltered (("\n\032\032post-")); |
306d9ac5 | 513 | puts_unfiltered (async_annotation_suffix); |
a3f17187 | 514 | printf_unfiltered (("\n")); |
b5a0ac70 SS |
515 | } |
516 | ||
517 | if (linebuffer == 0) | |
518 | { | |
519 | linelength = 80; | |
520 | linebuffer = (char *) xmalloc (linelength); | |
6e5d7f39 | 521 | linebuffer[0] = '\0'; |
b5a0ac70 SS |
522 | } |
523 | ||
524 | p = linebuffer; | |
525 | ||
526 | if (more_to_come) | |
527 | { | |
528 | strcpy (linebuffer, readline_input_state.linebuffer); | |
529 | p = readline_input_state.linebuffer_ptr; | |
b8c9b27d | 530 | xfree (readline_input_state.linebuffer); |
b5a0ac70 | 531 | more_to_come = 0; |
b5a0ac70 SS |
532 | } |
533 | ||
534 | #ifdef STOP_SIGNAL | |
535 | if (job_control) | |
0f71a2f6 | 536 | signal (STOP_SIGNAL, handle_stop_sig); |
b5a0ac70 SS |
537 | #endif |
538 | ||
539 | /* Make sure that all output has been output. Some machines may let | |
371d5dec MS |
540 | you get away with leaving out some of the gdb_flush, but not |
541 | all. */ | |
b5a0ac70 SS |
542 | wrap_here (""); |
543 | gdb_flush (gdb_stdout); | |
544 | gdb_flush (gdb_stderr); | |
545 | ||
546 | if (source_file_name != NULL) | |
637537d0 | 547 | ++source_line_number; |
b5a0ac70 SS |
548 | |
549 | /* If we are in this case, then command_handler will call quit | |
371d5dec | 550 | and exit from gdb. */ |
b5a0ac70 SS |
551 | if (!rl || rl == (char *) EOF) |
552 | { | |
b5a0ac70 | 553 | command_handler (0); |
371d5dec | 554 | return; /* Lint. */ |
b5a0ac70 SS |
555 | } |
556 | if (strlen (rl) + 1 + (p - linebuffer) > linelength) | |
557 | { | |
558 | linelength = strlen (rl) + 1 + (p - linebuffer); | |
559 | nline = (char *) xrealloc (linebuffer, linelength); | |
560 | p += nline - linebuffer; | |
561 | linebuffer = nline; | |
562 | } | |
563 | p1 = rl; | |
564 | /* Copy line. Don't copy null at end. (Leaves line alone | |
371d5dec | 565 | if this was just a newline). */ |
b5a0ac70 SS |
566 | while (*p1) |
567 | *p++ = *p1++; | |
568 | ||
b8c9b27d | 569 | xfree (rl); /* Allocated in readline. */ |
b5a0ac70 | 570 | |
4dd79c29 | 571 | if (p > linebuffer && *(p - 1) == '\\') |
b5a0ac70 | 572 | { |
20bb6bc8 | 573 | *p = '\0'; |
b5a0ac70 SS |
574 | p--; /* Put on top of '\'. */ |
575 | ||
1b36a34b | 576 | readline_input_state.linebuffer = xstrdup (linebuffer); |
d96429cd AS |
577 | readline_input_state.linebuffer_ptr = p; |
578 | ||
579 | /* We will not invoke a execute_command if there is more | |
371d5dec MS |
580 | input expected to complete the command. So, we need to |
581 | print an empty prompt here. */ | |
d96429cd | 582 | more_to_come = 1; |
ab821bc6 | 583 | display_gdb_prompt (""); |
d96429cd | 584 | return; |
b5a0ac70 SS |
585 | } |
586 | ||
587 | #ifdef STOP_SIGNAL | |
588 | if (job_control) | |
589 | signal (STOP_SIGNAL, SIG_DFL); | |
590 | #endif | |
591 | ||
592 | #define SERVER_COMMAND_LENGTH 7 | |
593 | server_command = | |
594 | (p - linebuffer > SERVER_COMMAND_LENGTH) | |
bf896cb0 | 595 | && strncmp (linebuffer, "server ", SERVER_COMMAND_LENGTH) == 0; |
b5a0ac70 SS |
596 | if (server_command) |
597 | { | |
598 | /* Note that we don't set `line'. Between this and the check in | |
599 | dont_repeat, this insures that repeating will still do the | |
600 | right thing. */ | |
601 | *p = '\0'; | |
602 | command_handler (linebuffer + SERVER_COMMAND_LENGTH); | |
603 | display_gdb_prompt (0); | |
604 | return; | |
605 | } | |
606 | ||
607 | /* Do history expansion if that is wished. */ | |
608 | if (history_expansion_p && instream == stdin | |
609 | && ISATTY (instream)) | |
610 | { | |
611 | char *history_value; | |
612 | int expanded; | |
613 | ||
614 | *p = '\0'; /* Insert null now. */ | |
615 | expanded = history_expand (linebuffer, &history_value); | |
616 | if (expanded) | |
617 | { | |
618 | /* Print the changes. */ | |
619 | printf_unfiltered ("%s\n", history_value); | |
620 | ||
621 | /* If there was an error, call this function again. */ | |
622 | if (expanded < 0) | |
623 | { | |
b8c9b27d | 624 | xfree (history_value); |
b5a0ac70 SS |
625 | return; |
626 | } | |
627 | if (strlen (history_value) > linelength) | |
628 | { | |
629 | linelength = strlen (history_value) + 1; | |
630 | linebuffer = (char *) xrealloc (linebuffer, linelength); | |
631 | } | |
632 | strcpy (linebuffer, history_value); | |
633 | p = linebuffer + strlen (linebuffer); | |
b5a0ac70 | 634 | } |
f5b73fbb | 635 | xfree (history_value); |
b5a0ac70 SS |
636 | } |
637 | ||
371d5dec MS |
638 | /* If we just got an empty line, and that is supposed to repeat the |
639 | previous command, return the value in the global buffer. */ | |
b5a0ac70 SS |
640 | if (repeat && p == linebuffer && *p != '\\') |
641 | { | |
dc7eb48e | 642 | command_handler (saved_command_line); |
b5a0ac70 SS |
643 | display_gdb_prompt (0); |
644 | return; | |
645 | } | |
646 | ||
647 | for (p1 = linebuffer; *p1 == ' ' || *p1 == '\t'; p1++); | |
648 | if (repeat && !*p1) | |
649 | { | |
dc7eb48e | 650 | command_handler (saved_command_line); |
b5a0ac70 SS |
651 | display_gdb_prompt (0); |
652 | return; | |
653 | } | |
654 | ||
655 | *p = 0; | |
656 | ||
657 | /* Add line to history if appropriate. */ | |
840da61a | 658 | if (*linebuffer && input_from_terminal_p ()) |
b5a0ac70 SS |
659 | add_history (linebuffer); |
660 | ||
661 | /* Note: lines consisting solely of comments are added to the command | |
662 | history. This is useful when you type a command, and then | |
663 | realize you don't want to execute it quite yet. You can comment | |
664 | out the command and then later fetch it from the value history | |
665 | and remove the '#'. The kill ring is probably better, but some | |
666 | people are in the habit of commenting things out. */ | |
667 | if (*p1 == '#') | |
371d5dec | 668 | *p1 = '\0'; /* Found a comment. */ |
b5a0ac70 SS |
669 | |
670 | /* Save into global buffer if appropriate. */ | |
671 | if (repeat) | |
672 | { | |
dc7eb48e | 673 | if (linelength > saved_command_line_size) |
b5a0ac70 | 674 | { |
dc7eb48e PA |
675 | saved_command_line = xrealloc (saved_command_line, linelength); |
676 | saved_command_line_size = linelength; | |
b5a0ac70 | 677 | } |
dc7eb48e | 678 | strcpy (saved_command_line, linebuffer); |
b5a0ac70 SS |
679 | if (!more_to_come) |
680 | { | |
dc7eb48e | 681 | command_handler (saved_command_line); |
b5a0ac70 SS |
682 | display_gdb_prompt (0); |
683 | } | |
684 | return; | |
685 | } | |
686 | ||
687 | command_handler (linebuffer); | |
688 | display_gdb_prompt (0); | |
689 | return; | |
690 | } | |
691 | ||
692 | /* Does reading of input from terminal w/o the editing features | |
371d5dec | 693 | provided by the readline library. */ |
b5a0ac70 | 694 | |
371d5dec | 695 | /* NOTE: 1999-04-30 Asynchronous version of gdb_readline; gdb_readline |
b5a0ac70 | 696 | will become obsolete when the event loop is made the default |
371d5dec | 697 | execution for gdb. */ |
085dd6e6 | 698 | void |
c2c6d25f | 699 | gdb_readline2 (gdb_client_data client_data) |
b5a0ac70 SS |
700 | { |
701 | int c; | |
702 | char *result; | |
703 | int input_index = 0; | |
704 | int result_size = 80; | |
7be570e7 JM |
705 | static int done_once = 0; |
706 | ||
707 | /* Unbuffer the input stream, so that, later on, the calls to fgetc | |
371d5dec | 708 | fetch only one char at the time from the stream. The fgetc's will |
7be570e7 | 709 | get up to the first newline, but there may be more chars in the |
371d5dec | 710 | stream after '\n'. If we buffer the input and fgetc drains the |
7be570e7 | 711 | stream, getting stuff beyond the newline as well, a select, done |
371d5dec | 712 | afterwards will not trigger. */ |
7be570e7 JM |
713 | if (!done_once && !ISATTY (instream)) |
714 | { | |
715 | setbuf (instream, NULL); | |
716 | done_once = 1; | |
717 | } | |
b5a0ac70 SS |
718 | |
719 | result = (char *) xmalloc (result_size); | |
720 | ||
721 | /* We still need the while loop here, even though it would seem | |
722 | obvious to invoke gdb_readline2 at every character entered. If | |
723 | not using the readline library, the terminal is in cooked mode, | |
371d5dec MS |
724 | which sends the characters all at once. Poll will notice that the |
725 | input fd has changed state only after enter is pressed. At this | |
726 | point we still need to fetch all the chars entered. */ | |
b5a0ac70 SS |
727 | |
728 | while (1) | |
729 | { | |
730 | /* Read from stdin if we are executing a user defined command. | |
731 | This is the right thing for prompt_for_continue, at least. */ | |
732 | c = fgetc (instream ? instream : stdin); | |
733 | ||
734 | if (c == EOF) | |
735 | { | |
736 | if (input_index > 0) | |
371d5dec MS |
737 | /* The last line does not end with a newline. Return it, |
738 | and if we are called again fgetc will still return EOF | |
739 | and we'll return NULL then. */ | |
b5a0ac70 | 740 | break; |
b8c9b27d | 741 | xfree (result); |
0f71a2f6 | 742 | (*input_handler) (0); |
13ce7133 | 743 | return; |
b5a0ac70 SS |
744 | } |
745 | ||
746 | if (c == '\n') | |
b5a0ac70 SS |
747 | { |
748 | if (input_index > 0 && result[input_index - 1] == '\r') | |
749 | input_index--; | |
750 | break; | |
751 | } | |
b5a0ac70 SS |
752 | |
753 | result[input_index++] = c; | |
754 | while (input_index >= result_size) | |
755 | { | |
756 | result_size *= 2; | |
757 | result = (char *) xrealloc (result, result_size); | |
758 | } | |
759 | } | |
760 | ||
761 | result[input_index++] = '\0'; | |
0f71a2f6 | 762 | (*input_handler) (result); |
b5a0ac70 SS |
763 | } |
764 | \f | |
765 | ||
766 | /* Initialization of signal handlers and tokens. There is a function | |
371d5dec | 767 | handle_sig* for each of the signals GDB cares about. Specifically: |
b5a0ac70 SS |
768 | SIGINT, SIGFPE, SIGQUIT, SIGTSTP, SIGHUP, SIGWINCH. These |
769 | functions are the actual signal handlers associated to the signals | |
770 | via calls to signal(). The only job for these functions is to | |
771 | enqueue the appropriate event/procedure with the event loop. Such | |
371d5dec | 772 | procedures are the old signal handlers. The event loop will take |
b5a0ac70 | 773 | care of invoking the queued procedures to perform the usual tasks |
371d5dec | 774 | associated with the reception of the signal. */ |
392a587b | 775 | /* NOTE: 1999-04-30 This is the asynchronous version of init_signals. |
b5a0ac70 | 776 | init_signals will become obsolete as we move to have to event loop |
371d5dec | 777 | as the default for gdb. */ |
b5a0ac70 | 778 | void |
c2c6d25f | 779 | async_init_signals (void) |
c5aa993b | 780 | { |
b5a0ac70 SS |
781 | signal (SIGINT, handle_sigint); |
782 | sigint_token = | |
0f71a2f6 | 783 | create_async_signal_handler (async_request_quit, NULL); |
a7266fef | 784 | signal (SIGTERM, handle_sigterm); |
06c868a8 JK |
785 | async_sigterm_token |
786 | = create_async_signal_handler (async_sigterm_handler, NULL); | |
b5a0ac70 SS |
787 | |
788 | /* If SIGTRAP was set to SIG_IGN, then the SIG_IGN will get passed | |
789 | to the inferior and breakpoints will be ignored. */ | |
790 | #ifdef SIGTRAP | |
791 | signal (SIGTRAP, SIG_DFL); | |
792 | #endif | |
793 | ||
6d318c73 | 794 | #ifdef SIGQUIT |
b5a0ac70 SS |
795 | /* If we initialize SIGQUIT to SIG_IGN, then the SIG_IGN will get |
796 | passed to the inferior, which we don't want. It would be | |
797 | possible to do a "signal (SIGQUIT, SIG_DFL)" after we fork, but | |
798 | on BSD4.3 systems using vfork, that can affect the | |
799 | GDB process as well as the inferior (the signal handling tables | |
800 | might be in memory, shared between the two). Since we establish | |
801 | a handler for SIGQUIT, when we call exec it will set the signal | |
802 | to SIG_DFL for us. */ | |
803 | signal (SIGQUIT, handle_sigquit); | |
804 | sigquit_token = | |
0f71a2f6 | 805 | create_async_signal_handler (async_do_nothing, NULL); |
6d318c73 | 806 | #endif |
b5a0ac70 SS |
807 | #ifdef SIGHUP |
808 | if (signal (SIGHUP, handle_sighup) != SIG_IGN) | |
809 | sighup_token = | |
0f71a2f6 | 810 | create_async_signal_handler (async_disconnect, NULL); |
b5a0ac70 SS |
811 | else |
812 | sighup_token = | |
0f71a2f6 | 813 | create_async_signal_handler (async_do_nothing, NULL); |
b5a0ac70 SS |
814 | #endif |
815 | signal (SIGFPE, handle_sigfpe); | |
816 | sigfpe_token = | |
0f71a2f6 | 817 | create_async_signal_handler (async_float_handler, NULL); |
b5a0ac70 | 818 | |
0f71a2f6 JM |
819 | #ifdef STOP_SIGNAL |
820 | sigtstp_token = | |
821 | create_async_signal_handler (async_stop_sig, NULL); | |
822 | #endif | |
0f71a2f6 JM |
823 | } |
824 | ||
371d5dec MS |
825 | /* Tell the event loop what to do if SIGINT is received. |
826 | See event-signal.c. */ | |
c5aa993b | 827 | void |
c2c6d25f | 828 | handle_sigint (int sig) |
b5a0ac70 SS |
829 | { |
830 | signal (sig, handle_sigint); | |
831 | ||
5f960e00 FF |
832 | /* We could be running in a loop reading in symfiles or something so |
833 | it may be quite a while before we get back to the event loop. So | |
371d5dec | 834 | set quit_flag to 1 here. Then if QUIT is called before we get to |
5f960e00 FF |
835 | the event loop, we will unwind as expected. */ |
836 | ||
522002f9 | 837 | set_quit_flag (); |
5f960e00 | 838 | |
b5a0ac70 | 839 | /* If immediate_quit is set, we go ahead and process the SIGINT right |
371d5dec | 840 | away, even if we usually would defer this to the event loop. The |
b5a0ac70 | 841 | assumption here is that it is safe to process ^C immediately if |
371d5dec | 842 | immediate_quit is set. If we didn't, SIGINT would be really |
b5a0ac70 SS |
843 | processed only the next time through the event loop. To get to |
844 | that point, though, the command that we want to interrupt needs to | |
b803fb0f | 845 | finish first, which is unacceptable. If immediate quit is not set, |
371d5dec | 846 | we process SIGINT the next time through the loop, which is fine. */ |
b803fb0f | 847 | gdb_call_async_signal_handler (sigint_token, immediate_quit); |
b5a0ac70 SS |
848 | } |
849 | ||
06c868a8 JK |
850 | /* Handle GDB exit upon receiving SIGTERM if target_can_async_p (). */ |
851 | ||
852 | static void | |
853 | async_sigterm_handler (gdb_client_data arg) | |
854 | { | |
855 | quit_force (NULL, stdin == instream); | |
856 | } | |
857 | ||
858 | /* See defs.h. */ | |
859 | volatile int sync_quit_force_run; | |
860 | ||
a7266fef AS |
861 | /* Quit GDB if SIGTERM is received. |
862 | GDB would quit anyway, but this way it will clean up properly. */ | |
863 | void | |
864 | handle_sigterm (int sig) | |
865 | { | |
866 | signal (sig, handle_sigterm); | |
06c868a8 JK |
867 | |
868 | /* Call quit_force in a signal safe way. | |
869 | quit_force itself is not signal safe. */ | |
870 | if (target_can_async_p ()) | |
871 | mark_async_signal_handler (async_sigterm_token); | |
872 | else | |
873 | { | |
874 | sync_quit_force_run = 1; | |
875 | set_quit_flag (); | |
876 | } | |
a7266fef AS |
877 | } |
878 | ||
371d5dec | 879 | /* Do the quit. All the checks have been done by the caller. */ |
c5aa993b | 880 | void |
c2c6d25f | 881 | async_request_quit (gdb_client_data arg) |
b5a0ac70 | 882 | { |
5f960e00 | 883 | /* If the quit_flag has gotten reset back to 0 by the time we get |
4ac94eda FF |
884 | back here, that means that an exception was thrown to unwind the |
885 | current command before we got back to the event loop. So there | |
522002f9 | 886 | is no reason to call quit again here. */ |
5f960e00 | 887 | |
522002f9 | 888 | if (check_quit_flag ()) |
4ac94eda | 889 | quit (); |
b5a0ac70 SS |
890 | } |
891 | ||
6d318c73 | 892 | #ifdef SIGQUIT |
371d5dec MS |
893 | /* Tell the event loop what to do if SIGQUIT is received. |
894 | See event-signal.c. */ | |
c5aa993b | 895 | static void |
c2c6d25f | 896 | handle_sigquit (int sig) |
b5a0ac70 | 897 | { |
f6fbab7d | 898 | mark_async_signal_handler (sigquit_token); |
b5a0ac70 SS |
899 | signal (sig, handle_sigquit); |
900 | } | |
6d318c73 | 901 | #endif |
b5a0ac70 | 902 | |
0f0b8dcd DJ |
903 | #if defined (SIGQUIT) || defined (SIGHUP) |
904 | /* Called by the event loop in response to a SIGQUIT or an | |
905 | ignored SIGHUP. */ | |
c5aa993b | 906 | static void |
c2c6d25f | 907 | async_do_nothing (gdb_client_data arg) |
b5a0ac70 | 908 | { |
371d5dec | 909 | /* Empty function body. */ |
b5a0ac70 | 910 | } |
0f0b8dcd | 911 | #endif |
b5a0ac70 SS |
912 | |
913 | #ifdef SIGHUP | |
371d5dec MS |
914 | /* Tell the event loop what to do if SIGHUP is received. |
915 | See event-signal.c. */ | |
c5aa993b | 916 | static void |
fba45db2 | 917 | handle_sighup (int sig) |
b5a0ac70 | 918 | { |
f6fbab7d | 919 | mark_async_signal_handler (sighup_token); |
b5a0ac70 SS |
920 | signal (sig, handle_sighup); |
921 | } | |
922 | ||
371d5dec | 923 | /* Called by the event loop to process a SIGHUP. */ |
c5aa993b | 924 | static void |
c2c6d25f | 925 | async_disconnect (gdb_client_data arg) |
b5a0ac70 | 926 | { |
b2cd6b29 JM |
927 | volatile struct gdb_exception exception; |
928 | ||
929 | TRY_CATCH (exception, RETURN_MASK_ALL) | |
930 | { | |
931 | quit_cover (); | |
932 | } | |
933 | ||
934 | if (exception.reason < 0) | |
935 | { | |
936 | fputs_filtered ("Could not kill the program being debugged", | |
937 | gdb_stderr); | |
938 | exception_print (gdb_stderr, exception); | |
939 | } | |
940 | ||
941 | TRY_CATCH (exception, RETURN_MASK_ALL) | |
942 | { | |
460014f5 | 943 | pop_all_targets (); |
b2cd6b29 JM |
944 | } |
945 | ||
371d5dec | 946 | signal (SIGHUP, SIG_DFL); /*FIXME: ??????????? */ |
ec4dfccf | 947 | raise (SIGHUP); |
b5a0ac70 SS |
948 | } |
949 | #endif | |
950 | ||
0f71a2f6 | 951 | #ifdef STOP_SIGNAL |
c5aa993b | 952 | void |
c2c6d25f | 953 | handle_stop_sig (int sig) |
0f71a2f6 | 954 | { |
f6fbab7d | 955 | mark_async_signal_handler (sigtstp_token); |
c5aa993b | 956 | signal (sig, handle_stop_sig); |
0f71a2f6 JM |
957 | } |
958 | ||
959 | static void | |
c2c6d25f | 960 | async_stop_sig (gdb_client_data arg) |
0f71a2f6 | 961 | { |
ab821bc6 | 962 | char *prompt = get_prompt (); |
d7f9d729 | 963 | |
0f71a2f6 JM |
964 | #if STOP_SIGNAL == SIGTSTP |
965 | signal (SIGTSTP, SIG_DFL); | |
2acceee2 JM |
966 | #if HAVE_SIGPROCMASK |
967 | { | |
968 | sigset_t zero; | |
46711df8 | 969 | |
2acceee2 JM |
970 | sigemptyset (&zero); |
971 | sigprocmask (SIG_SETMASK, &zero, 0); | |
972 | } | |
46711df8 | 973 | #elif HAVE_SIGSETMASK |
0f71a2f6 | 974 | sigsetmask (0); |
2acceee2 | 975 | #endif |
ec4dfccf | 976 | raise (SIGTSTP); |
0f71a2f6 JM |
977 | signal (SIGTSTP, handle_stop_sig); |
978 | #else | |
979 | signal (STOP_SIGNAL, handle_stop_sig); | |
980 | #endif | |
981 | printf_unfiltered ("%s", prompt); | |
982 | gdb_flush (gdb_stdout); | |
983 | ||
371d5dec MS |
984 | /* Forget about any previous command -- null line now will do |
985 | nothing. */ | |
0f71a2f6 JM |
986 | dont_repeat (); |
987 | } | |
988 | #endif /* STOP_SIGNAL */ | |
989 | ||
371d5dec MS |
990 | /* Tell the event loop what to do if SIGFPE is received. |
991 | See event-signal.c. */ | |
c5aa993b | 992 | static void |
c2c6d25f | 993 | handle_sigfpe (int sig) |
b5a0ac70 | 994 | { |
f6fbab7d | 995 | mark_async_signal_handler (sigfpe_token); |
b5a0ac70 SS |
996 | signal (sig, handle_sigfpe); |
997 | } | |
998 | ||
371d5dec | 999 | /* Event loop will call this functin to process a SIGFPE. */ |
c5aa993b | 1000 | static void |
c2c6d25f | 1001 | async_float_handler (gdb_client_data arg) |
b5a0ac70 | 1002 | { |
371d5dec MS |
1003 | /* This message is based on ANSI C, section 4.7. Note that integer |
1004 | divide by zero causes this, so "float" is a misnomer. */ | |
8a3fe4f8 | 1005 | error (_("Erroneous arithmetic operation.")); |
b5a0ac70 | 1006 | } |
b5a0ac70 SS |
1007 | \f |
1008 | ||
1009 | /* Called by do_setshow_command. */ | |
b5a0ac70 | 1010 | void |
371d5dec MS |
1011 | set_async_editing_command (char *args, int from_tty, |
1012 | struct cmd_list_element *c) | |
b5a0ac70 SS |
1013 | { |
1014 | change_line_handler (); | |
1015 | } | |
1016 | ||
0f71a2f6 JM |
1017 | /* Set things up for readline to be invoked via the alternate |
1018 | interface, i.e. via a callback function (rl_callback_read_char), | |
371d5dec | 1019 | and hook up instream to the event loop. */ |
0f71a2f6 | 1020 | void |
cee6ddeb | 1021 | gdb_setup_readline (void) |
0f71a2f6 | 1022 | { |
362646f5 AC |
1023 | /* This function is a noop for the sync case. The assumption is |
1024 | that the sync setup is ALL done in gdb_init, and we would only | |
1025 | mess it up here. The sync stuff should really go away over | |
1026 | time. */ | |
1a088d06 AS |
1027 | if (!batch_silent) |
1028 | gdb_stdout = stdio_fileopen (stdout); | |
ffa4ac95 | 1029 | gdb_stderr = stderr_fileopen (); |
362646f5 AC |
1030 | gdb_stdlog = gdb_stderr; /* for moment */ |
1031 | gdb_stdtarg = gdb_stderr; /* for moment */ | |
8d4d924b | 1032 | gdb_stdtargerr = gdb_stderr; /* for moment */ |
362646f5 AC |
1033 | |
1034 | /* If the input stream is connected to a terminal, turn on | |
1035 | editing. */ | |
1036 | if (ISATTY (instream)) | |
9e0b60a8 | 1037 | { |
371d5dec | 1038 | /* Tell gdb that we will be using the readline library. This |
362646f5 AC |
1039 | could be overwritten by a command in .gdbinit like 'set |
1040 | editing on' or 'off'. */ | |
1041 | async_command_editing_p = 1; | |
c5201926 | 1042 | |
362646f5 AC |
1043 | /* When a character is detected on instream by select or poll, |
1044 | readline will be invoked via this callback function. */ | |
1045 | call_readline = rl_callback_read_char_wrapper; | |
9e0b60a8 | 1046 | } |
362646f5 AC |
1047 | else |
1048 | { | |
1049 | async_command_editing_p = 0; | |
1050 | call_readline = gdb_readline2; | |
1051 | } | |
1052 | ||
1053 | /* When readline has read an end-of-line character, it passes the | |
371d5dec | 1054 | complete line to gdb for processing; command_line_handler is the |
362646f5 AC |
1055 | function that does this. */ |
1056 | input_handler = command_line_handler; | |
1057 | ||
371d5dec | 1058 | /* Tell readline to use the same input stream that gdb uses. */ |
362646f5 AC |
1059 | rl_instream = instream; |
1060 | ||
1061 | /* Get a file descriptor for the input stream, so that we can | |
1062 | register it with the event loop. */ | |
1063 | input_fd = fileno (instream); | |
1064 | ||
1065 | /* Now we need to create the event sources for the input file | |
1066 | descriptor. */ | |
1067 | /* At this point in time, this is the only event source that we | |
371d5dec | 1068 | register with the even loop. Another source is going to be the |
362646f5 AC |
1069 | target program (inferior), but that must be registered only when |
1070 | it actually exists (I.e. after we say 'run' or after we connect | |
1071 | to a remote target. */ | |
1072 | add_file_handler (input_fd, stdin_event_handler, 0); | |
0f71a2f6 | 1073 | } |
cee6ddeb | 1074 | |
7d5b6fdd EZ |
1075 | /* Disable command input through the standard CLI channels. Used in |
1076 | the suspend proc for interpreters that use the standard gdb readline | |
1077 | interface, like the cli & the mi. */ | |
1078 | void | |
1079 | gdb_disable_readline (void) | |
1080 | { | |
362646f5 AC |
1081 | /* FIXME - It is too heavyweight to delete and remake these every |
1082 | time you run an interpreter that needs readline. It is probably | |
1083 | better to have the interpreters cache these, which in turn means | |
1084 | that this needs to be moved into interpreter specific code. */ | |
7d5b6fdd EZ |
1085 | |
1086 | #if 0 | |
362646f5 AC |
1087 | ui_file_delete (gdb_stdout); |
1088 | ui_file_delete (gdb_stderr); | |
1089 | gdb_stdlog = NULL; | |
1090 | gdb_stdtarg = NULL; | |
8d4d924b | 1091 | gdb_stdtargerr = NULL; |
7d5b6fdd EZ |
1092 | #endif |
1093 | ||
d3d4baed | 1094 | gdb_rl_callback_handler_remove (); |
362646f5 | 1095 | delete_file_handler (input_fd); |
7d5b6fdd | 1096 | } |