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