Commit | Line | Data |
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b5a0ac70 | 1 | /* Top level stuff for GDB, the GNU debugger. |
637537d0 | 2 | |
618f726f | 3 | Copyright (C) 1999-2016 Free Software Foundation, Inc. |
637537d0 | 4 | |
b5a0ac70 SS |
5 | Written by Elena Zannoni <ezannoni@cygnus.com> of Cygnus Solutions. |
6 | ||
7 | This file is part of GDB. | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 11 | the Free Software Foundation; either version 3 of the License, or |
b5a0ac70 SS |
12 | (at your option) any later version. |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
371d5dec | 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
b5a0ac70 SS |
21 | |
22 | #include "defs.h" | |
0f71a2f6 | 23 | #include "top.h" |
b5a0ac70 | 24 | #include "inferior.h" |
45741a9c | 25 | #include "infrun.h" |
e514a9d6 | 26 | #include "target.h" |
c5aa993b | 27 | #include "terminal.h" /* for job_control */ |
9e0b60a8 | 28 | #include "event-loop.h" |
c2c6d25f | 29 | #include "event-top.h" |
4389a95a | 30 | #include "interps.h" |
042be3a9 | 31 | #include <signal.h> |
16026cd7 | 32 | #include "cli/cli-script.h" /* for reset_command_nest_depth */ |
d01a8610 | 33 | #include "main.h" |
8ea051c5 | 34 | #include "gdbthread.h" |
d17b6f81 | 35 | #include "observer.h" |
be34f849 | 36 | #include "continuations.h" |
371d5dec | 37 | #include "gdbcmd.h" /* for dont_repeat() */ |
bd00c694 | 38 | #include "annotate.h" |
bd712aed | 39 | #include "maint.h" |
187212b3 | 40 | #include "buffer.h" |
104c1213 | 41 | |
371d5dec | 42 | /* readline include files. */ |
dbda9972 AC |
43 | #include "readline/readline.h" |
44 | #include "readline/history.h" | |
b5a0ac70 SS |
45 | |
46 | /* readline defines this. */ | |
47 | #undef savestring | |
48 | ||
c2c6d25f JM |
49 | static void rl_callback_read_char_wrapper (gdb_client_data client_data); |
50 | static void command_line_handler (char *rl); | |
c2c6d25f | 51 | static void change_line_handler (void); |
c2c6d25f | 52 | static void command_handler (char *command); |
ab821bc6 | 53 | static char *top_level_prompt (void); |
b5a0ac70 | 54 | |
371d5dec | 55 | /* Signal handlers. */ |
6d318c73 | 56 | #ifdef SIGQUIT |
c2c6d25f | 57 | static void handle_sigquit (int sig); |
6d318c73 | 58 | #endif |
0f0b8dcd | 59 | #ifdef SIGHUP |
c2c6d25f | 60 | static void handle_sighup (int sig); |
0f0b8dcd | 61 | #endif |
c2c6d25f | 62 | static void handle_sigfpe (int sig); |
b5a0ac70 SS |
63 | |
64 | /* Functions to be invoked by the event loop in response to | |
371d5dec | 65 | signals. */ |
0f0b8dcd | 66 | #if defined (SIGQUIT) || defined (SIGHUP) |
c2c6d25f | 67 | static void async_do_nothing (gdb_client_data); |
0f0b8dcd DJ |
68 | #endif |
69 | #ifdef SIGHUP | |
c2c6d25f | 70 | static void async_disconnect (gdb_client_data); |
0f0b8dcd | 71 | #endif |
c2c6d25f | 72 | static void async_float_handler (gdb_client_data); |
0f0b8dcd | 73 | #ifdef STOP_SIGNAL |
c2c6d25f | 74 | static void async_stop_sig (gdb_client_data); |
0f0b8dcd | 75 | #endif |
06c868a8 | 76 | static void async_sigterm_handler (gdb_client_data arg); |
b5a0ac70 | 77 | |
b5a0ac70 | 78 | /* Readline offers an alternate interface, via callback |
371d5dec | 79 | functions. These are all included in the file callback.c in the |
b5a0ac70 SS |
80 | readline distribution. This file provides (mainly) a function, which |
81 | the event loop uses as callback (i.e. event handler) whenever an event | |
82 | is detected on the standard input file descriptor. | |
83 | readline_callback_read_char is called (by the GDB event loop) whenever | |
371d5dec | 84 | there is a new character ready on the input stream. This function |
b5a0ac70 SS |
85 | incrementally builds a buffer internal to readline where it |
86 | accumulates the line read up to the point of invocation. In the | |
87 | special case in which the character read is newline, the function | |
88 | invokes a GDB supplied callback routine, which does the processing of | |
89 | a full command line. This latter routine is the asynchronous analog | |
371d5dec | 90 | of the old command_line_input in gdb. Instead of invoking (and waiting |
b5a0ac70 SS |
91 | for) readline to read the command line and pass it back to |
92 | command_loop for processing, the new command_line_handler function has | |
93 | the command line already available as its parameter. INPUT_HANDLER is | |
94 | to be set to the function that readline will invoke when a complete | |
95 | line of input is ready. CALL_READLINE is to be set to the function | |
371d5dec | 96 | that readline offers as callback to the event_loop. */ |
b5a0ac70 | 97 | |
c2c6d25f JM |
98 | void (*input_handler) (char *); |
99 | void (*call_readline) (gdb_client_data); | |
b5a0ac70 | 100 | |
371d5dec | 101 | /* Important variables for the event loop. */ |
b5a0ac70 SS |
102 | |
103 | /* This is used to determine if GDB is using the readline library or | |
371d5dec | 104 | its own simplified form of readline. It is used by the asynchronous |
0f71a2f6 | 105 | form of the set editing command. |
392a587b | 106 | ezannoni: as of 1999-04-29 I expect that this |
b5a0ac70 | 107 | variable will not be used after gdb is changed to use the event |
371d5dec | 108 | loop as default engine, and event-top.c is merged into top.c. */ |
b5a0ac70 SS |
109 | int async_command_editing_p; |
110 | ||
104c1213 | 111 | /* This is used to display the notification of the completion of an |
371d5dec | 112 | asynchronous execution command. */ |
104c1213 JM |
113 | int exec_done_display_p = 0; |
114 | ||
b5a0ac70 | 115 | /* This is the file descriptor for the input stream that GDB uses to |
371d5dec | 116 | read commands from. */ |
b5a0ac70 SS |
117 | int input_fd; |
118 | ||
d64e57fa PP |
119 | /* Used by the stdin event handler to compensate for missed stdin events. |
120 | Setting this to a non-zero value inside an stdin callback makes the callback | |
121 | run again. */ | |
122 | int call_stdin_event_handler_again_p; | |
123 | ||
371d5dec | 124 | /* Signal handling variables. */ |
b5a0ac70 | 125 | /* Each of these is a pointer to a function that the event loop will |
371d5dec | 126 | invoke if the corresponding signal has received. The real signal |
b5a0ac70 | 127 | handlers mark these functions as ready to be executed and the event |
371d5dec MS |
128 | loop, in a later iteration, calls them. See the function |
129 | invoke_async_signal_handler. */ | |
05fa9251 | 130 | static struct async_signal_handler *sigint_token; |
b5a0ac70 | 131 | #ifdef SIGHUP |
05fa9251 | 132 | static struct async_signal_handler *sighup_token; |
b5a0ac70 | 133 | #endif |
6d318c73 | 134 | #ifdef SIGQUIT |
05fa9251 | 135 | static struct async_signal_handler *sigquit_token; |
6d318c73 | 136 | #endif |
05fa9251 | 137 | static struct async_signal_handler *sigfpe_token; |
0f71a2f6 | 138 | #ifdef STOP_SIGNAL |
05fa9251 | 139 | static struct async_signal_handler *sigtstp_token; |
0f71a2f6 | 140 | #endif |
06c868a8 | 141 | static struct async_signal_handler *async_sigterm_token; |
0f71a2f6 | 142 | |
b5a0ac70 | 143 | /* Structure to save a partially entered command. This is used when |
371d5dec | 144 | the user types '\' at the end of a command line. This is necessary |
b5a0ac70 SS |
145 | because each line of input is handled by a different call to |
146 | command_line_handler, and normally there is no state retained | |
371d5dec | 147 | between different calls. */ |
ab821bc6 | 148 | static int more_to_come = 0; |
b5a0ac70 SS |
149 | |
150 | struct readline_input_state | |
151 | { | |
152 | char *linebuffer; | |
153 | char *linebuffer_ptr; | |
154 | } | |
155 | readline_input_state; | |
467d8519 TT |
156 | |
157 | /* This hook is called by rl_callback_read_char_wrapper after each | |
158 | character is processed. */ | |
b08ee6a2 | 159 | void (*after_char_processing_hook) (void); |
b5a0ac70 SS |
160 | \f |
161 | ||
371d5dec MS |
162 | /* Wrapper function for calling into the readline library. The event |
163 | loop expects the callback function to have a paramter, while | |
164 | readline expects none. */ | |
c2c6d25f JM |
165 | static void |
166 | rl_callback_read_char_wrapper (gdb_client_data client_data) | |
167 | { | |
168 | rl_callback_read_char (); | |
467d8519 TT |
169 | if (after_char_processing_hook) |
170 | (*after_char_processing_hook) (); | |
c2c6d25f JM |
171 | } |
172 | ||
b5a0ac70 | 173 | /* Initialize all the necessary variables, start the event loop, |
4d09c5b4 AB |
174 | register readline, and stdin, start the loop. The DATA is the |
175 | interpreter data cookie, ignored for now. */ | |
176 | ||
b5a0ac70 | 177 | void |
4d09c5b4 | 178 | cli_command_loop (void *data) |
b5a0ac70 | 179 | { |
7d8e6458 | 180 | display_gdb_prompt (0); |
b5a0ac70 | 181 | |
371d5dec | 182 | /* Now it's time to start the event loop. */ |
085dd6e6 | 183 | start_event_loop (); |
b5a0ac70 SS |
184 | } |
185 | ||
186 | /* Change the function to be invoked every time there is a character | |
371d5dec | 187 | ready on stdin. This is used when the user sets the editing off, |
b5a0ac70 | 188 | therefore bypassing readline, and letting gdb handle the input |
c70061cf PA |
189 | itself, via gdb_readline_no_editing_callback. Also it is used in |
190 | the opposite case in which the user sets editing on again, by | |
191 | restoring readline handling of the input. */ | |
392a587b | 192 | static void |
c2c6d25f | 193 | change_line_handler (void) |
b5a0ac70 | 194 | { |
371d5dec MS |
195 | /* NOTE: this operates on input_fd, not instream. If we are reading |
196 | commands from a file, instream will point to the file. However in | |
c2c6d25f | 197 | async mode, we always read commands from a file with editing |
371d5dec MS |
198 | off. This means that the 'set editing on/off' will have effect |
199 | only on the interactive session. */ | |
c2c6d25f | 200 | |
b5a0ac70 SS |
201 | if (async_command_editing_p) |
202 | { | |
371d5dec | 203 | /* Turn on editing by using readline. */ |
c2c6d25f | 204 | call_readline = rl_callback_read_char_wrapper; |
0f71a2f6 | 205 | input_handler = command_line_handler; |
b5a0ac70 SS |
206 | } |
207 | else | |
208 | { | |
c70061cf | 209 | /* Turn off editing by using gdb_readline_no_editing_callback. */ |
d3d4baed | 210 | gdb_rl_callback_handler_remove (); |
c70061cf | 211 | call_readline = gdb_readline_no_editing_callback; |
0f71a2f6 JM |
212 | |
213 | /* Set up the command handler as well, in case we are called as | |
371d5dec | 214 | first thing from .gdbinit. */ |
0f71a2f6 | 215 | input_handler = command_line_handler; |
b5a0ac70 | 216 | } |
b5a0ac70 SS |
217 | } |
218 | ||
d3d4baed PA |
219 | /* The functions below are wrappers for rl_callback_handler_remove and |
220 | rl_callback_handler_install that keep track of whether the callback | |
221 | handler is installed in readline. This is necessary because after | |
222 | handling a target event of a background execution command, we may | |
223 | need to reinstall the callback handler if it was removed due to a | |
224 | secondary prompt. See gdb_readline_wrapper_line. We don't | |
225 | unconditionally install the handler for every target event because | |
226 | that also clears the line buffer, thus installing it while the user | |
227 | is typing would lose input. */ | |
228 | ||
229 | /* Whether we've registered a callback handler with readline. */ | |
230 | static int callback_handler_installed; | |
231 | ||
232 | /* See event-top.h, and above. */ | |
233 | ||
234 | void | |
235 | gdb_rl_callback_handler_remove (void) | |
236 | { | |
237 | rl_callback_handler_remove (); | |
238 | callback_handler_installed = 0; | |
239 | } | |
240 | ||
241 | /* See event-top.h, and above. Note this wrapper doesn't have an | |
242 | actual callback parameter because we always install | |
243 | INPUT_HANDLER. */ | |
244 | ||
245 | void | |
246 | gdb_rl_callback_handler_install (const char *prompt) | |
247 | { | |
248 | /* Calling rl_callback_handler_install resets readline's input | |
249 | buffer. Calling this when we were already processing input | |
250 | therefore loses input. */ | |
251 | gdb_assert (!callback_handler_installed); | |
252 | ||
253 | rl_callback_handler_install (prompt, input_handler); | |
254 | callback_handler_installed = 1; | |
255 | } | |
256 | ||
257 | /* See event-top.h, and above. */ | |
258 | ||
259 | void | |
260 | gdb_rl_callback_handler_reinstall (void) | |
261 | { | |
262 | if (!callback_handler_installed) | |
263 | { | |
264 | /* Passing NULL as prompt argument tells readline to not display | |
265 | a prompt. */ | |
266 | gdb_rl_callback_handler_install (NULL); | |
267 | } | |
268 | } | |
269 | ||
ab821bc6 PA |
270 | /* Displays the prompt. If the argument NEW_PROMPT is NULL, the |
271 | prompt that is displayed is the current top level prompt. | |
272 | Otherwise, it displays whatever NEW_PROMPT is as a local/secondary | |
273 | prompt. | |
274 | ||
275 | This is used after each gdb command has completed, and in the | |
276 | following cases: | |
277 | ||
371d5dec | 278 | 1. When the user enters a command line which is ended by '\' |
ab821bc6 PA |
279 | indicating that the command will continue on the next line. In |
280 | that case the prompt that is displayed is the empty string. | |
281 | ||
0f71a2f6 | 282 | 2. When the user is entering 'commands' for a breakpoint, or |
371d5dec | 283 | actions for a tracepoint. In this case the prompt will be '>' |
ab821bc6 PA |
284 | |
285 | 3. On prompting for pagination. */ | |
286 | ||
b5a0ac70 | 287 | void |
38bcc89d | 288 | display_gdb_prompt (const char *new_prompt) |
b5a0ac70 | 289 | { |
d17b6f81 | 290 | char *actual_gdb_prompt = NULL; |
ab821bc6 | 291 | struct cleanup *old_chain; |
b5a0ac70 | 292 | |
bd00c694 PA |
293 | annotate_display_prompt (); |
294 | ||
16026cd7 AS |
295 | /* Reset the nesting depth used when trace-commands is set. */ |
296 | reset_command_nest_depth (); | |
297 | ||
ab821bc6 | 298 | old_chain = make_cleanup (free_current_contents, &actual_gdb_prompt); |
d17b6f81 | 299 | |
ab821bc6 PA |
300 | /* Do not call the python hook on an explicit prompt change as |
301 | passed to this function, as this forms a secondary/local prompt, | |
302 | IE, displayed but not set. */ | |
303 | if (! new_prompt) | |
adf40b2e | 304 | { |
ab821bc6 | 305 | if (sync_execution) |
d17b6f81 | 306 | { |
ab821bc6 PA |
307 | /* This is to trick readline into not trying to display the |
308 | prompt. Even though we display the prompt using this | |
309 | function, readline still tries to do its own display if | |
310 | we don't call rl_callback_handler_install and | |
311 | rl_callback_handler_remove (which readline detects | |
312 | because a global variable is not set). If readline did | |
313 | that, it could mess up gdb signal handlers for SIGINT. | |
314 | Readline assumes that between calls to rl_set_signals and | |
315 | rl_clear_signals gdb doesn't do anything with the signal | |
316 | handlers. Well, that's not the case, because when the | |
317 | target executes we change the SIGINT signal handler. If | |
318 | we allowed readline to display the prompt, the signal | |
319 | handler change would happen exactly between the calls to | |
320 | the above two functions. Calling | |
321 | rl_callback_handler_remove(), does the job. */ | |
322 | ||
d3d4baed | 323 | gdb_rl_callback_handler_remove (); |
faab9922 | 324 | do_cleanups (old_chain); |
ab821bc6 | 325 | return; |
d17b6f81 PM |
326 | } |
327 | else | |
ab821bc6 PA |
328 | { |
329 | /* Display the top level prompt. */ | |
330 | actual_gdb_prompt = top_level_prompt (); | |
331 | } | |
b5a0ac70 | 332 | } |
ab821bc6 PA |
333 | else |
334 | actual_gdb_prompt = xstrdup (new_prompt); | |
b5a0ac70 SS |
335 | |
336 | if (async_command_editing_p) | |
337 | { | |
d3d4baed PA |
338 | gdb_rl_callback_handler_remove (); |
339 | gdb_rl_callback_handler_install (actual_gdb_prompt); | |
b5a0ac70 | 340 | } |
371d5dec | 341 | /* new_prompt at this point can be the top of the stack or the one |
d014929c MS |
342 | passed in. It can't be NULL. */ |
343 | else | |
b5a0ac70 SS |
344 | { |
345 | /* Don't use a _filtered function here. It causes the assumed | |
346 | character position to be off, since the newline we read from | |
347 | the user is not accounted for. */ | |
d17b6f81 | 348 | fputs_unfiltered (actual_gdb_prompt, gdb_stdout); |
b5a0ac70 SS |
349 | gdb_flush (gdb_stdout); |
350 | } | |
ab821bc6 PA |
351 | |
352 | do_cleanups (old_chain); | |
b5a0ac70 SS |
353 | } |
354 | ||
ab821bc6 PA |
355 | /* Return the top level prompt, as specified by "set prompt", possibly |
356 | overriden by the python gdb.prompt_hook hook, and then composed | |
357 | with the prompt prefix and suffix (annotations). The caller is | |
358 | responsible for freeing the returned string. */ | |
359 | ||
360 | static char * | |
361 | top_level_prompt (void) | |
b5a0ac70 | 362 | { |
608ff013 | 363 | char *prompt; |
b5a0ac70 | 364 | |
ab821bc6 PA |
365 | /* Give observers a chance of changing the prompt. E.g., the python |
366 | `gdb.prompt_hook' is installed as an observer. */ | |
367 | observer_notify_before_prompt (get_prompt ()); | |
368 | ||
608ff013 | 369 | prompt = get_prompt (); |
b5a0ac70 | 370 | |
ab821bc6 | 371 | if (annotation_level >= 2) |
b5a0ac70 | 372 | { |
ab821bc6 | 373 | /* Prefix needs to have new line at end. */ |
608ff013 | 374 | const char prefix[] = "\n\032\032pre-prompt\n"; |
ab821bc6 PA |
375 | |
376 | /* Suffix needs to have a new line at end and \032 \032 at | |
377 | beginning. */ | |
608ff013 | 378 | const char suffix[] = "\n\032\032prompt\n"; |
b5a0ac70 | 379 | |
608ff013 PA |
380 | return concat (prefix, prompt, suffix, NULL); |
381 | } | |
ab821bc6 | 382 | |
608ff013 | 383 | return xstrdup (prompt); |
b5a0ac70 | 384 | } |
c2c6d25f | 385 | |
187212b3 | 386 | /* When there is an event ready on the stdin file descriptor, instead |
c2c6d25f | 387 | of calling readline directly throught the callback function, or |
c70061cf PA |
388 | instead of calling gdb_readline_no_editing_callback, give gdb a |
389 | chance to detect errors and do something. */ | |
390 | ||
c2c6d25f | 391 | void |
2acceee2 | 392 | stdin_event_handler (int error, gdb_client_data client_data) |
c2c6d25f JM |
393 | { |
394 | if (error) | |
395 | { | |
a3f17187 | 396 | printf_unfiltered (_("error detected on stdin\n")); |
2acceee2 | 397 | delete_file_handler (input_fd); |
371d5dec | 398 | /* If stdin died, we may as well kill gdb. */ |
c5394b80 | 399 | quit_command ((char *) 0, stdin == instream); |
c2c6d25f JM |
400 | } |
401 | else | |
d64e57fa PP |
402 | { |
403 | do | |
404 | { | |
405 | call_stdin_event_handler_again_p = 0; | |
406 | (*call_readline) (client_data); | |
407 | } while (call_stdin_event_handler_again_p != 0); | |
408 | } | |
c2c6d25f JM |
409 | } |
410 | ||
6426a772 JM |
411 | /* Re-enable stdin after the end of an execution command in |
412 | synchronous mode, or after an error from the target, and we aborted | |
371d5dec | 413 | the exec operation. */ |
6426a772 JM |
414 | |
415 | void | |
712af3be | 416 | async_enable_stdin (void) |
6426a772 | 417 | { |
32c1e744 VP |
418 | if (sync_execution) |
419 | { | |
371d5dec | 420 | /* See NOTE in async_disable_stdin(). */ |
32c1e744 VP |
421 | /* FIXME: cagney/1999-09-27: Call this before clearing |
422 | sync_execution. Current target_terminal_ours() implementations | |
371d5dec | 423 | check for sync_execution before switching the terminal. */ |
32c1e744 | 424 | target_terminal_ours (); |
32c1e744 VP |
425 | sync_execution = 0; |
426 | } | |
6426a772 JM |
427 | } |
428 | ||
429 | /* Disable reads from stdin (the console) marking the command as | |
371d5dec | 430 | synchronous. */ |
6426a772 JM |
431 | |
432 | void | |
433 | async_disable_stdin (void) | |
434 | { | |
ab821bc6 | 435 | sync_execution = 1; |
6426a772 | 436 | } |
b5a0ac70 | 437 | \f |
6426a772 | 438 | |
371d5dec | 439 | /* Handles a gdb command. This function is called by |
b5a0ac70 | 440 | command_line_handler, which has processed one or more input lines |
371d5dec | 441 | into COMMAND. */ |
392a587b | 442 | /* NOTE: 1999-04-30 This is the asynchronous version of the command_loop |
b5a0ac70 | 443 | function. The command_loop function will be obsolete when we |
371d5dec | 444 | switch to use the event loop at every execution of gdb. */ |
392a587b | 445 | static void |
c2c6d25f | 446 | command_handler (char *command) |
b5a0ac70 | 447 | { |
0f3bb72e | 448 | struct cleanup *stat_chain; |
b5a0ac70 | 449 | |
522002f9 | 450 | clear_quit_flag (); |
bc008695 | 451 | if (instream == stdin) |
b5a0ac70 | 452 | reinitialize_more_filter (); |
b5a0ac70 | 453 | |
371d5dec MS |
454 | /* If readline returned a NULL command, it means that the connection |
455 | with the terminal is gone. This happens at the end of a | |
456 | testsuite run, after Expect has hung up but GDB is still alive. | |
457 | In such a case, we just quit gdb killing the inferior program | |
458 | too. */ | |
b5a0ac70 | 459 | if (command == 0) |
fa3fd85b AS |
460 | { |
461 | printf_unfiltered ("quit\n"); | |
462 | execute_command ("quit", stdin == instream); | |
463 | } | |
b5a0ac70 | 464 | |
0f3bb72e | 465 | stat_chain = make_command_stats_cleanup (1); |
b5a0ac70 SS |
466 | |
467 | execute_command (command, instream == stdin); | |
c5aa993b | 468 | |
347bddb7 PA |
469 | /* Do any commands attached to breakpoint we stopped at. */ |
470 | bpstat_do_actions (); | |
c5aa993b | 471 | |
0f3bb72e | 472 | do_cleanups (stat_chain); |
43ff13b4 JM |
473 | } |
474 | ||
371d5dec MS |
475 | /* Handle a complete line of input. This is called by the callback |
476 | mechanism within the readline library. Deal with incomplete | |
477 | commands as well, by saving the partial input in a global | |
478 | buffer. */ | |
b5a0ac70 | 479 | |
392a587b | 480 | /* NOTE: 1999-04-30 This is the asynchronous version of the |
371d5dec | 481 | command_line_input function; command_line_input will become |
b5a0ac70 | 482 | obsolete once we use the event loop as the default mechanism in |
371d5dec | 483 | GDB. */ |
b5a0ac70 | 484 | static void |
c2c6d25f | 485 | command_line_handler (char *rl) |
b5a0ac70 SS |
486 | { |
487 | static char *linebuffer = 0; | |
488 | static unsigned linelength = 0; | |
52f0bd74 | 489 | char *p; |
b5a0ac70 | 490 | char *p1; |
b5a0ac70 | 491 | char *nline; |
b5a0ac70 SS |
492 | int repeat = (instream == stdin); |
493 | ||
494 | if (annotation_level > 1 && instream == stdin) | |
608ff013 | 495 | printf_unfiltered (("\n\032\032post-prompt\n")); |
b5a0ac70 SS |
496 | |
497 | if (linebuffer == 0) | |
498 | { | |
499 | linelength = 80; | |
500 | linebuffer = (char *) xmalloc (linelength); | |
6e5d7f39 | 501 | linebuffer[0] = '\0'; |
b5a0ac70 SS |
502 | } |
503 | ||
504 | p = linebuffer; | |
505 | ||
506 | if (more_to_come) | |
507 | { | |
508 | strcpy (linebuffer, readline_input_state.linebuffer); | |
509 | p = readline_input_state.linebuffer_ptr; | |
b8c9b27d | 510 | xfree (readline_input_state.linebuffer); |
b5a0ac70 | 511 | more_to_come = 0; |
b5a0ac70 SS |
512 | } |
513 | ||
514 | #ifdef STOP_SIGNAL | |
515 | if (job_control) | |
0f71a2f6 | 516 | signal (STOP_SIGNAL, handle_stop_sig); |
b5a0ac70 SS |
517 | #endif |
518 | ||
519 | /* Make sure that all output has been output. Some machines may let | |
371d5dec MS |
520 | you get away with leaving out some of the gdb_flush, but not |
521 | all. */ | |
b5a0ac70 SS |
522 | wrap_here (""); |
523 | gdb_flush (gdb_stdout); | |
524 | gdb_flush (gdb_stderr); | |
525 | ||
526 | if (source_file_name != NULL) | |
637537d0 | 527 | ++source_line_number; |
b5a0ac70 SS |
528 | |
529 | /* If we are in this case, then command_handler will call quit | |
371d5dec | 530 | and exit from gdb. */ |
b5a0ac70 SS |
531 | if (!rl || rl == (char *) EOF) |
532 | { | |
b5a0ac70 | 533 | command_handler (0); |
371d5dec | 534 | return; /* Lint. */ |
b5a0ac70 SS |
535 | } |
536 | if (strlen (rl) + 1 + (p - linebuffer) > linelength) | |
537 | { | |
538 | linelength = strlen (rl) + 1 + (p - linebuffer); | |
539 | nline = (char *) xrealloc (linebuffer, linelength); | |
540 | p += nline - linebuffer; | |
541 | linebuffer = nline; | |
542 | } | |
543 | p1 = rl; | |
544 | /* Copy line. Don't copy null at end. (Leaves line alone | |
371d5dec | 545 | if this was just a newline). */ |
b5a0ac70 SS |
546 | while (*p1) |
547 | *p++ = *p1++; | |
548 | ||
b8c9b27d | 549 | xfree (rl); /* Allocated in readline. */ |
b5a0ac70 | 550 | |
4dd79c29 | 551 | if (p > linebuffer && *(p - 1) == '\\') |
b5a0ac70 | 552 | { |
20bb6bc8 | 553 | *p = '\0'; |
b5a0ac70 SS |
554 | p--; /* Put on top of '\'. */ |
555 | ||
1b36a34b | 556 | readline_input_state.linebuffer = xstrdup (linebuffer); |
d96429cd AS |
557 | readline_input_state.linebuffer_ptr = p; |
558 | ||
559 | /* We will not invoke a execute_command if there is more | |
371d5dec MS |
560 | input expected to complete the command. So, we need to |
561 | print an empty prompt here. */ | |
d96429cd | 562 | more_to_come = 1; |
ab821bc6 | 563 | display_gdb_prompt (""); |
d96429cd | 564 | return; |
b5a0ac70 SS |
565 | } |
566 | ||
567 | #ifdef STOP_SIGNAL | |
568 | if (job_control) | |
569 | signal (STOP_SIGNAL, SIG_DFL); | |
570 | #endif | |
571 | ||
572 | #define SERVER_COMMAND_LENGTH 7 | |
573 | server_command = | |
574 | (p - linebuffer > SERVER_COMMAND_LENGTH) | |
bf896cb0 | 575 | && strncmp (linebuffer, "server ", SERVER_COMMAND_LENGTH) == 0; |
b5a0ac70 SS |
576 | if (server_command) |
577 | { | |
578 | /* Note that we don't set `line'. Between this and the check in | |
579 | dont_repeat, this insures that repeating will still do the | |
580 | right thing. */ | |
581 | *p = '\0'; | |
582 | command_handler (linebuffer + SERVER_COMMAND_LENGTH); | |
583 | display_gdb_prompt (0); | |
584 | return; | |
585 | } | |
586 | ||
587 | /* Do history expansion if that is wished. */ | |
588 | if (history_expansion_p && instream == stdin | |
589 | && ISATTY (instream)) | |
590 | { | |
591 | char *history_value; | |
592 | int expanded; | |
593 | ||
594 | *p = '\0'; /* Insert null now. */ | |
595 | expanded = history_expand (linebuffer, &history_value); | |
596 | if (expanded) | |
597 | { | |
598 | /* Print the changes. */ | |
599 | printf_unfiltered ("%s\n", history_value); | |
600 | ||
601 | /* If there was an error, call this function again. */ | |
602 | if (expanded < 0) | |
603 | { | |
b8c9b27d | 604 | xfree (history_value); |
b5a0ac70 SS |
605 | return; |
606 | } | |
607 | if (strlen (history_value) > linelength) | |
608 | { | |
609 | linelength = strlen (history_value) + 1; | |
610 | linebuffer = (char *) xrealloc (linebuffer, linelength); | |
611 | } | |
612 | strcpy (linebuffer, history_value); | |
613 | p = linebuffer + strlen (linebuffer); | |
b5a0ac70 | 614 | } |
f5b73fbb | 615 | xfree (history_value); |
b5a0ac70 SS |
616 | } |
617 | ||
371d5dec MS |
618 | /* If we just got an empty line, and that is supposed to repeat the |
619 | previous command, return the value in the global buffer. */ | |
b5a0ac70 SS |
620 | if (repeat && p == linebuffer && *p != '\\') |
621 | { | |
dc7eb48e | 622 | command_handler (saved_command_line); |
b5a0ac70 SS |
623 | display_gdb_prompt (0); |
624 | return; | |
625 | } | |
626 | ||
627 | for (p1 = linebuffer; *p1 == ' ' || *p1 == '\t'; p1++); | |
628 | if (repeat && !*p1) | |
629 | { | |
dc7eb48e | 630 | command_handler (saved_command_line); |
b5a0ac70 SS |
631 | display_gdb_prompt (0); |
632 | return; | |
633 | } | |
634 | ||
635 | *p = 0; | |
636 | ||
637 | /* Add line to history if appropriate. */ | |
840da61a | 638 | if (*linebuffer && input_from_terminal_p ()) |
08b13bdd | 639 | gdb_add_history (linebuffer); |
b5a0ac70 SS |
640 | |
641 | /* Note: lines consisting solely of comments are added to the command | |
642 | history. This is useful when you type a command, and then | |
643 | realize you don't want to execute it quite yet. You can comment | |
644 | out the command and then later fetch it from the value history | |
645 | and remove the '#'. The kill ring is probably better, but some | |
646 | people are in the habit of commenting things out. */ | |
647 | if (*p1 == '#') | |
371d5dec | 648 | *p1 = '\0'; /* Found a comment. */ |
b5a0ac70 SS |
649 | |
650 | /* Save into global buffer if appropriate. */ | |
651 | if (repeat) | |
652 | { | |
dc7eb48e | 653 | if (linelength > saved_command_line_size) |
b5a0ac70 | 654 | { |
224c3ddb SM |
655 | saved_command_line |
656 | = (char *) xrealloc (saved_command_line, linelength); | |
dc7eb48e | 657 | saved_command_line_size = linelength; |
b5a0ac70 | 658 | } |
dc7eb48e | 659 | strcpy (saved_command_line, linebuffer); |
b5a0ac70 SS |
660 | if (!more_to_come) |
661 | { | |
dc7eb48e | 662 | command_handler (saved_command_line); |
b5a0ac70 SS |
663 | display_gdb_prompt (0); |
664 | } | |
665 | return; | |
666 | } | |
667 | ||
668 | command_handler (linebuffer); | |
669 | display_gdb_prompt (0); | |
670 | return; | |
671 | } | |
672 | ||
673 | /* Does reading of input from terminal w/o the editing features | |
c70061cf PA |
674 | provided by the readline library. Calls the line input handler |
675 | once we have a whole input line. */ | |
b5a0ac70 | 676 | |
085dd6e6 | 677 | void |
c70061cf | 678 | gdb_readline_no_editing_callback (gdb_client_data client_data) |
b5a0ac70 SS |
679 | { |
680 | int c; | |
681 | char *result; | |
187212b3 | 682 | struct buffer line_buffer; |
7be570e7 JM |
683 | static int done_once = 0; |
684 | ||
187212b3 PA |
685 | buffer_init (&line_buffer); |
686 | ||
7be570e7 | 687 | /* Unbuffer the input stream, so that, later on, the calls to fgetc |
371d5dec | 688 | fetch only one char at the time from the stream. The fgetc's will |
7be570e7 | 689 | get up to the first newline, but there may be more chars in the |
371d5dec | 690 | stream after '\n'. If we buffer the input and fgetc drains the |
7be570e7 | 691 | stream, getting stuff beyond the newline as well, a select, done |
371d5dec | 692 | afterwards will not trigger. */ |
7be570e7 JM |
693 | if (!done_once && !ISATTY (instream)) |
694 | { | |
695 | setbuf (instream, NULL); | |
696 | done_once = 1; | |
697 | } | |
b5a0ac70 | 698 | |
b5a0ac70 | 699 | /* We still need the while loop here, even though it would seem |
c70061cf PA |
700 | obvious to invoke gdb_readline_no_editing_callback at every |
701 | character entered. If not using the readline library, the | |
702 | terminal is in cooked mode, which sends the characters all at | |
703 | once. Poll will notice that the input fd has changed state only | |
704 | after enter is pressed. At this point we still need to fetch all | |
705 | the chars entered. */ | |
b5a0ac70 SS |
706 | |
707 | while (1) | |
708 | { | |
709 | /* Read from stdin if we are executing a user defined command. | |
710 | This is the right thing for prompt_for_continue, at least. */ | |
711 | c = fgetc (instream ? instream : stdin); | |
712 | ||
713 | if (c == EOF) | |
714 | { | |
187212b3 PA |
715 | if (line_buffer.used_size > 0) |
716 | { | |
717 | /* The last line does not end with a newline. Return it, and | |
718 | if we are called again fgetc will still return EOF and | |
719 | we'll return NULL then. */ | |
720 | break; | |
721 | } | |
722 | xfree (buffer_finish (&line_buffer)); | |
0f71a2f6 | 723 | (*input_handler) (0); |
13ce7133 | 724 | return; |
b5a0ac70 SS |
725 | } |
726 | ||
727 | if (c == '\n') | |
b5a0ac70 | 728 | { |
187212b3 PA |
729 | if (line_buffer.used_size > 0 |
730 | && line_buffer.buffer[line_buffer.used_size - 1] == '\r') | |
731 | line_buffer.used_size--; | |
b5a0ac70 SS |
732 | break; |
733 | } | |
b5a0ac70 | 734 | |
187212b3 | 735 | buffer_grow_char (&line_buffer, c); |
b5a0ac70 SS |
736 | } |
737 | ||
187212b3 PA |
738 | buffer_grow_char (&line_buffer, '\0'); |
739 | result = buffer_finish (&line_buffer); | |
0f71a2f6 | 740 | (*input_handler) (result); |
b5a0ac70 SS |
741 | } |
742 | \f | |
743 | ||
744 | /* Initialization of signal handlers and tokens. There is a function | |
371d5dec | 745 | handle_sig* for each of the signals GDB cares about. Specifically: |
b5a0ac70 SS |
746 | SIGINT, SIGFPE, SIGQUIT, SIGTSTP, SIGHUP, SIGWINCH. These |
747 | functions are the actual signal handlers associated to the signals | |
748 | via calls to signal(). The only job for these functions is to | |
749 | enqueue the appropriate event/procedure with the event loop. Such | |
371d5dec | 750 | procedures are the old signal handlers. The event loop will take |
b5a0ac70 | 751 | care of invoking the queued procedures to perform the usual tasks |
371d5dec | 752 | associated with the reception of the signal. */ |
392a587b | 753 | /* NOTE: 1999-04-30 This is the asynchronous version of init_signals. |
b5a0ac70 | 754 | init_signals will become obsolete as we move to have to event loop |
371d5dec | 755 | as the default for gdb. */ |
b5a0ac70 | 756 | void |
c2c6d25f | 757 | async_init_signals (void) |
c5aa993b | 758 | { |
b5a0ac70 SS |
759 | signal (SIGINT, handle_sigint); |
760 | sigint_token = | |
0f71a2f6 | 761 | create_async_signal_handler (async_request_quit, NULL); |
a7266fef | 762 | signal (SIGTERM, handle_sigterm); |
06c868a8 JK |
763 | async_sigterm_token |
764 | = create_async_signal_handler (async_sigterm_handler, NULL); | |
b5a0ac70 SS |
765 | |
766 | /* If SIGTRAP was set to SIG_IGN, then the SIG_IGN will get passed | |
767 | to the inferior and breakpoints will be ignored. */ | |
768 | #ifdef SIGTRAP | |
769 | signal (SIGTRAP, SIG_DFL); | |
770 | #endif | |
771 | ||
6d318c73 | 772 | #ifdef SIGQUIT |
b5a0ac70 SS |
773 | /* If we initialize SIGQUIT to SIG_IGN, then the SIG_IGN will get |
774 | passed to the inferior, which we don't want. It would be | |
775 | possible to do a "signal (SIGQUIT, SIG_DFL)" after we fork, but | |
776 | on BSD4.3 systems using vfork, that can affect the | |
777 | GDB process as well as the inferior (the signal handling tables | |
778 | might be in memory, shared between the two). Since we establish | |
779 | a handler for SIGQUIT, when we call exec it will set the signal | |
780 | to SIG_DFL for us. */ | |
781 | signal (SIGQUIT, handle_sigquit); | |
782 | sigquit_token = | |
0f71a2f6 | 783 | create_async_signal_handler (async_do_nothing, NULL); |
6d318c73 | 784 | #endif |
b5a0ac70 SS |
785 | #ifdef SIGHUP |
786 | if (signal (SIGHUP, handle_sighup) != SIG_IGN) | |
787 | sighup_token = | |
0f71a2f6 | 788 | create_async_signal_handler (async_disconnect, NULL); |
b5a0ac70 SS |
789 | else |
790 | sighup_token = | |
0f71a2f6 | 791 | create_async_signal_handler (async_do_nothing, NULL); |
b5a0ac70 SS |
792 | #endif |
793 | signal (SIGFPE, handle_sigfpe); | |
794 | sigfpe_token = | |
0f71a2f6 | 795 | create_async_signal_handler (async_float_handler, NULL); |
b5a0ac70 | 796 | |
0f71a2f6 JM |
797 | #ifdef STOP_SIGNAL |
798 | sigtstp_token = | |
799 | create_async_signal_handler (async_stop_sig, NULL); | |
800 | #endif | |
0f71a2f6 JM |
801 | } |
802 | ||
371d5dec MS |
803 | /* Tell the event loop what to do if SIGINT is received. |
804 | See event-signal.c. */ | |
c5aa993b | 805 | void |
c2c6d25f | 806 | handle_sigint (int sig) |
b5a0ac70 SS |
807 | { |
808 | signal (sig, handle_sigint); | |
809 | ||
5f960e00 FF |
810 | /* We could be running in a loop reading in symfiles or something so |
811 | it may be quite a while before we get back to the event loop. So | |
371d5dec | 812 | set quit_flag to 1 here. Then if QUIT is called before we get to |
5f960e00 FF |
813 | the event loop, we will unwind as expected. */ |
814 | ||
522002f9 | 815 | set_quit_flag (); |
5f960e00 | 816 | |
b5a0ac70 | 817 | /* If immediate_quit is set, we go ahead and process the SIGINT right |
371d5dec | 818 | away, even if we usually would defer this to the event loop. The |
b5a0ac70 | 819 | assumption here is that it is safe to process ^C immediately if |
371d5dec | 820 | immediate_quit is set. If we didn't, SIGINT would be really |
b5a0ac70 SS |
821 | processed only the next time through the event loop. To get to |
822 | that point, though, the command that we want to interrupt needs to | |
b803fb0f | 823 | finish first, which is unacceptable. If immediate quit is not set, |
371d5dec | 824 | we process SIGINT the next time through the loop, which is fine. */ |
b803fb0f | 825 | gdb_call_async_signal_handler (sigint_token, immediate_quit); |
b5a0ac70 SS |
826 | } |
827 | ||
06c868a8 JK |
828 | /* Handle GDB exit upon receiving SIGTERM if target_can_async_p (). */ |
829 | ||
830 | static void | |
831 | async_sigterm_handler (gdb_client_data arg) | |
832 | { | |
833 | quit_force (NULL, stdin == instream); | |
834 | } | |
835 | ||
836 | /* See defs.h. */ | |
837 | volatile int sync_quit_force_run; | |
838 | ||
a7266fef AS |
839 | /* Quit GDB if SIGTERM is received. |
840 | GDB would quit anyway, but this way it will clean up properly. */ | |
841 | void | |
842 | handle_sigterm (int sig) | |
843 | { | |
844 | signal (sig, handle_sigterm); | |
06c868a8 | 845 | |
077836f7 PP |
846 | sync_quit_force_run = 1; |
847 | set_quit_flag (); | |
848 | ||
849 | mark_async_signal_handler (async_sigterm_token); | |
a7266fef AS |
850 | } |
851 | ||
371d5dec | 852 | /* Do the quit. All the checks have been done by the caller. */ |
c5aa993b | 853 | void |
c2c6d25f | 854 | async_request_quit (gdb_client_data arg) |
b5a0ac70 | 855 | { |
5f960e00 | 856 | /* If the quit_flag has gotten reset back to 0 by the time we get |
4ac94eda FF |
857 | back here, that means that an exception was thrown to unwind the |
858 | current command before we got back to the event loop. So there | |
522002f9 | 859 | is no reason to call quit again here. */ |
5f960e00 | 860 | |
522002f9 | 861 | if (check_quit_flag ()) |
4ac94eda | 862 | quit (); |
b5a0ac70 SS |
863 | } |
864 | ||
6d318c73 | 865 | #ifdef SIGQUIT |
371d5dec MS |
866 | /* Tell the event loop what to do if SIGQUIT is received. |
867 | See event-signal.c. */ | |
c5aa993b | 868 | static void |
c2c6d25f | 869 | handle_sigquit (int sig) |
b5a0ac70 | 870 | { |
f6fbab7d | 871 | mark_async_signal_handler (sigquit_token); |
b5a0ac70 SS |
872 | signal (sig, handle_sigquit); |
873 | } | |
6d318c73 | 874 | #endif |
b5a0ac70 | 875 | |
0f0b8dcd DJ |
876 | #if defined (SIGQUIT) || defined (SIGHUP) |
877 | /* Called by the event loop in response to a SIGQUIT or an | |
878 | ignored SIGHUP. */ | |
c5aa993b | 879 | static void |
c2c6d25f | 880 | async_do_nothing (gdb_client_data arg) |
b5a0ac70 | 881 | { |
371d5dec | 882 | /* Empty function body. */ |
b5a0ac70 | 883 | } |
0f0b8dcd | 884 | #endif |
b5a0ac70 SS |
885 | |
886 | #ifdef SIGHUP | |
371d5dec MS |
887 | /* Tell the event loop what to do if SIGHUP is received. |
888 | See event-signal.c. */ | |
c5aa993b | 889 | static void |
fba45db2 | 890 | handle_sighup (int sig) |
b5a0ac70 | 891 | { |
f6fbab7d | 892 | mark_async_signal_handler (sighup_token); |
b5a0ac70 SS |
893 | signal (sig, handle_sighup); |
894 | } | |
895 | ||
371d5dec | 896 | /* Called by the event loop to process a SIGHUP. */ |
c5aa993b | 897 | static void |
c2c6d25f | 898 | async_disconnect (gdb_client_data arg) |
b5a0ac70 | 899 | { |
b2cd6b29 | 900 | |
492d29ea | 901 | TRY |
b2cd6b29 JM |
902 | { |
903 | quit_cover (); | |
904 | } | |
905 | ||
492d29ea | 906 | CATCH (exception, RETURN_MASK_ALL) |
b2cd6b29 JM |
907 | { |
908 | fputs_filtered ("Could not kill the program being debugged", | |
909 | gdb_stderr); | |
910 | exception_print (gdb_stderr, exception); | |
911 | } | |
492d29ea | 912 | END_CATCH |
b2cd6b29 | 913 | |
492d29ea | 914 | TRY |
b2cd6b29 | 915 | { |
460014f5 | 916 | pop_all_targets (); |
b2cd6b29 | 917 | } |
492d29ea PA |
918 | CATCH (exception, RETURN_MASK_ALL) |
919 | { | |
920 | } | |
921 | END_CATCH | |
b2cd6b29 | 922 | |
371d5dec | 923 | signal (SIGHUP, SIG_DFL); /*FIXME: ??????????? */ |
ec4dfccf | 924 | raise (SIGHUP); |
b5a0ac70 SS |
925 | } |
926 | #endif | |
927 | ||
0f71a2f6 | 928 | #ifdef STOP_SIGNAL |
c5aa993b | 929 | void |
c2c6d25f | 930 | handle_stop_sig (int sig) |
0f71a2f6 | 931 | { |
f6fbab7d | 932 | mark_async_signal_handler (sigtstp_token); |
c5aa993b | 933 | signal (sig, handle_stop_sig); |
0f71a2f6 JM |
934 | } |
935 | ||
936 | static void | |
c2c6d25f | 937 | async_stop_sig (gdb_client_data arg) |
0f71a2f6 | 938 | { |
ab821bc6 | 939 | char *prompt = get_prompt (); |
d7f9d729 | 940 | |
0f71a2f6 JM |
941 | #if STOP_SIGNAL == SIGTSTP |
942 | signal (SIGTSTP, SIG_DFL); | |
2acceee2 JM |
943 | #if HAVE_SIGPROCMASK |
944 | { | |
945 | sigset_t zero; | |
46711df8 | 946 | |
2acceee2 JM |
947 | sigemptyset (&zero); |
948 | sigprocmask (SIG_SETMASK, &zero, 0); | |
949 | } | |
46711df8 | 950 | #elif HAVE_SIGSETMASK |
0f71a2f6 | 951 | sigsetmask (0); |
2acceee2 | 952 | #endif |
ec4dfccf | 953 | raise (SIGTSTP); |
0f71a2f6 JM |
954 | signal (SIGTSTP, handle_stop_sig); |
955 | #else | |
956 | signal (STOP_SIGNAL, handle_stop_sig); | |
957 | #endif | |
958 | printf_unfiltered ("%s", prompt); | |
959 | gdb_flush (gdb_stdout); | |
960 | ||
371d5dec MS |
961 | /* Forget about any previous command -- null line now will do |
962 | nothing. */ | |
0f71a2f6 JM |
963 | dont_repeat (); |
964 | } | |
965 | #endif /* STOP_SIGNAL */ | |
966 | ||
371d5dec MS |
967 | /* Tell the event loop what to do if SIGFPE is received. |
968 | See event-signal.c. */ | |
c5aa993b | 969 | static void |
c2c6d25f | 970 | handle_sigfpe (int sig) |
b5a0ac70 | 971 | { |
f6fbab7d | 972 | mark_async_signal_handler (sigfpe_token); |
b5a0ac70 SS |
973 | signal (sig, handle_sigfpe); |
974 | } | |
975 | ||
371d5dec | 976 | /* Event loop will call this functin to process a SIGFPE. */ |
c5aa993b | 977 | static void |
c2c6d25f | 978 | async_float_handler (gdb_client_data arg) |
b5a0ac70 | 979 | { |
371d5dec MS |
980 | /* This message is based on ANSI C, section 4.7. Note that integer |
981 | divide by zero causes this, so "float" is a misnomer. */ | |
8a3fe4f8 | 982 | error (_("Erroneous arithmetic operation.")); |
b5a0ac70 | 983 | } |
b5a0ac70 SS |
984 | \f |
985 | ||
986 | /* Called by do_setshow_command. */ | |
b5a0ac70 | 987 | void |
371d5dec MS |
988 | set_async_editing_command (char *args, int from_tty, |
989 | struct cmd_list_element *c) | |
b5a0ac70 SS |
990 | { |
991 | change_line_handler (); | |
992 | } | |
993 | ||
0f71a2f6 JM |
994 | /* Set things up for readline to be invoked via the alternate |
995 | interface, i.e. via a callback function (rl_callback_read_char), | |
371d5dec | 996 | and hook up instream to the event loop. */ |
0f71a2f6 | 997 | void |
cee6ddeb | 998 | gdb_setup_readline (void) |
0f71a2f6 | 999 | { |
362646f5 AC |
1000 | /* This function is a noop for the sync case. The assumption is |
1001 | that the sync setup is ALL done in gdb_init, and we would only | |
1002 | mess it up here. The sync stuff should really go away over | |
1003 | time. */ | |
1a088d06 AS |
1004 | if (!batch_silent) |
1005 | gdb_stdout = stdio_fileopen (stdout); | |
ffa4ac95 | 1006 | gdb_stderr = stderr_fileopen (); |
362646f5 AC |
1007 | gdb_stdlog = gdb_stderr; /* for moment */ |
1008 | gdb_stdtarg = gdb_stderr; /* for moment */ | |
8d4d924b | 1009 | gdb_stdtargerr = gdb_stderr; /* for moment */ |
362646f5 AC |
1010 | |
1011 | /* If the input stream is connected to a terminal, turn on | |
1012 | editing. */ | |
1013 | if (ISATTY (instream)) | |
9e0b60a8 | 1014 | { |
371d5dec | 1015 | /* Tell gdb that we will be using the readline library. This |
362646f5 AC |
1016 | could be overwritten by a command in .gdbinit like 'set |
1017 | editing on' or 'off'. */ | |
1018 | async_command_editing_p = 1; | |
c5201926 | 1019 | |
362646f5 AC |
1020 | /* When a character is detected on instream by select or poll, |
1021 | readline will be invoked via this callback function. */ | |
1022 | call_readline = rl_callback_read_char_wrapper; | |
9e0b60a8 | 1023 | } |
362646f5 AC |
1024 | else |
1025 | { | |
1026 | async_command_editing_p = 0; | |
c70061cf | 1027 | call_readline = gdb_readline_no_editing_callback; |
362646f5 AC |
1028 | } |
1029 | ||
1030 | /* When readline has read an end-of-line character, it passes the | |
371d5dec | 1031 | complete line to gdb for processing; command_line_handler is the |
362646f5 AC |
1032 | function that does this. */ |
1033 | input_handler = command_line_handler; | |
1034 | ||
371d5dec | 1035 | /* Tell readline to use the same input stream that gdb uses. */ |
362646f5 AC |
1036 | rl_instream = instream; |
1037 | ||
1038 | /* Get a file descriptor for the input stream, so that we can | |
1039 | register it with the event loop. */ | |
1040 | input_fd = fileno (instream); | |
1041 | ||
1042 | /* Now we need to create the event sources for the input file | |
1043 | descriptor. */ | |
1044 | /* At this point in time, this is the only event source that we | |
371d5dec | 1045 | register with the even loop. Another source is going to be the |
362646f5 AC |
1046 | target program (inferior), but that must be registered only when |
1047 | it actually exists (I.e. after we say 'run' or after we connect | |
1048 | to a remote target. */ | |
1049 | add_file_handler (input_fd, stdin_event_handler, 0); | |
0f71a2f6 | 1050 | } |
cee6ddeb | 1051 | |
7d5b6fdd EZ |
1052 | /* Disable command input through the standard CLI channels. Used in |
1053 | the suspend proc for interpreters that use the standard gdb readline | |
1054 | interface, like the cli & the mi. */ | |
1055 | void | |
1056 | gdb_disable_readline (void) | |
1057 | { | |
362646f5 AC |
1058 | /* FIXME - It is too heavyweight to delete and remake these every |
1059 | time you run an interpreter that needs readline. It is probably | |
1060 | better to have the interpreters cache these, which in turn means | |
1061 | that this needs to be moved into interpreter specific code. */ | |
7d5b6fdd EZ |
1062 | |
1063 | #if 0 | |
362646f5 AC |
1064 | ui_file_delete (gdb_stdout); |
1065 | ui_file_delete (gdb_stderr); | |
1066 | gdb_stdlog = NULL; | |
1067 | gdb_stdtarg = NULL; | |
8d4d924b | 1068 | gdb_stdtargerr = NULL; |
7d5b6fdd EZ |
1069 | #endif |
1070 | ||
d3d4baed | 1071 | gdb_rl_callback_handler_remove (); |
362646f5 | 1072 | delete_file_handler (input_fd); |
7d5b6fdd | 1073 | } |