Commit | Line | Data |
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b5a0ac70 | 1 | /* Top level stuff for GDB, the GNU debugger. |
637537d0 | 2 | |
0b302171 JB |
3 | Copyright (C) 1999-2002, 2004-2005, 2007-2012 Free Software |
4 | Foundation, Inc. | |
637537d0 | 5 | |
b5a0ac70 SS |
6 | Written by Elena Zannoni <ezannoni@cygnus.com> of Cygnus Solutions. |
7 | ||
8 | This file is part of GDB. | |
9 | ||
10 | This program is free software; you can redistribute it and/or modify | |
11 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 12 | the Free Software Foundation; either version 3 of the License, or |
b5a0ac70 SS |
13 | (at your option) any later version. |
14 | ||
15 | This program is distributed in the hope that it will be useful, | |
16 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | GNU General Public License for more details. | |
19 | ||
20 | You should have received a copy of the GNU General Public License | |
371d5dec | 21 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
b5a0ac70 SS |
22 | |
23 | #include "defs.h" | |
0f71a2f6 | 24 | #include "top.h" |
b5a0ac70 | 25 | #include "inferior.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> |
60250e8b | 32 | #include "exceptions.h" |
16026cd7 | 33 | #include "cli/cli-script.h" /* for reset_command_nest_depth */ |
d01a8610 | 34 | #include "main.h" |
8ea051c5 | 35 | #include "gdbthread.h" |
d17b6f81 | 36 | #include "observer.h" |
be34f849 | 37 | #include "continuations.h" |
371d5dec | 38 | #include "gdbcmd.h" /* for dont_repeat() */ |
104c1213 | 39 | |
371d5dec | 40 | /* readline include files. */ |
dbda9972 AC |
41 | #include "readline/readline.h" |
42 | #include "readline/history.h" | |
b5a0ac70 SS |
43 | |
44 | /* readline defines this. */ | |
45 | #undef savestring | |
46 | ||
c2c6d25f JM |
47 | static void rl_callback_read_char_wrapper (gdb_client_data client_data); |
48 | static void command_line_handler (char *rl); | |
c2c6d25f | 49 | static void change_line_handler (void); |
c2c6d25f | 50 | static void command_handler (char *command); |
ab821bc6 | 51 | static char *top_level_prompt (void); |
b5a0ac70 | 52 | |
371d5dec | 53 | /* Signal handlers. */ |
6d318c73 | 54 | #ifdef SIGQUIT |
c2c6d25f | 55 | static void handle_sigquit (int sig); |
6d318c73 | 56 | #endif |
0f0b8dcd | 57 | #ifdef SIGHUP |
c2c6d25f | 58 | static void handle_sighup (int sig); |
0f0b8dcd | 59 | #endif |
c2c6d25f | 60 | static void handle_sigfpe (int sig); |
d4f3574e | 61 | #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER) |
c2c6d25f | 62 | static void handle_sigwinch (int sig); |
0f71a2f6 | 63 | #endif |
b5a0ac70 SS |
64 | |
65 | /* Functions to be invoked by the event loop in response to | |
371d5dec | 66 | signals. */ |
0f0b8dcd | 67 | #if defined (SIGQUIT) || defined (SIGHUP) |
c2c6d25f | 68 | static void async_do_nothing (gdb_client_data); |
0f0b8dcd DJ |
69 | #endif |
70 | #ifdef SIGHUP | |
c2c6d25f | 71 | static void async_disconnect (gdb_client_data); |
0f0b8dcd | 72 | #endif |
c2c6d25f | 73 | static void async_float_handler (gdb_client_data); |
0f0b8dcd | 74 | #ifdef STOP_SIGNAL |
c2c6d25f | 75 | static void async_stop_sig (gdb_client_data); |
0f0b8dcd | 76 | #endif |
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 | ||
b5a0ac70 | 111 | /* This is the annotation suffix that will be used when the |
371d5dec | 112 | annotation_level is 2. */ |
b5a0ac70 SS |
113 | char *async_annotation_suffix; |
114 | ||
104c1213 | 115 | /* This is used to display the notification of the completion of an |
371d5dec | 116 | asynchronous execution command. */ |
104c1213 JM |
117 | int exec_done_display_p = 0; |
118 | ||
b5a0ac70 | 119 | /* This is the file descriptor for the input stream that GDB uses to |
371d5dec | 120 | read commands from. */ |
b5a0ac70 SS |
121 | int input_fd; |
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. */ | |
97bb9d91 | 129 | void *sigint_token; |
b5a0ac70 | 130 | #ifdef SIGHUP |
97bb9d91 | 131 | void *sighup_token; |
b5a0ac70 | 132 | #endif |
6d318c73 | 133 | #ifdef SIGQUIT |
97bb9d91 | 134 | void *sigquit_token; |
6d318c73 | 135 | #endif |
97bb9d91 | 136 | void *sigfpe_token; |
b5a0ac70 | 137 | #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER) |
97bb9d91 | 138 | void *sigwinch_token; |
b5a0ac70 | 139 | #endif |
0f71a2f6 | 140 | #ifdef STOP_SIGNAL |
97bb9d91 | 141 | void *sigtstp_token; |
0f71a2f6 JM |
142 | #endif |
143 | ||
b5a0ac70 | 144 | /* Structure to save a partially entered command. This is used when |
371d5dec | 145 | the user types '\' at the end of a command line. This is necessary |
b5a0ac70 SS |
146 | because each line of input is handled by a different call to |
147 | command_line_handler, and normally there is no state retained | |
371d5dec | 148 | between different calls. */ |
ab821bc6 | 149 | static int more_to_come = 0; |
b5a0ac70 SS |
150 | |
151 | struct readline_input_state | |
152 | { | |
153 | char *linebuffer; | |
154 | char *linebuffer_ptr; | |
155 | } | |
156 | readline_input_state; | |
467d8519 TT |
157 | |
158 | /* This hook is called by rl_callback_read_char_wrapper after each | |
159 | character is processed. */ | |
b08ee6a2 | 160 | void (*after_char_processing_hook) (void); |
b5a0ac70 SS |
161 | \f |
162 | ||
371d5dec MS |
163 | /* Wrapper function for calling into the readline library. The event |
164 | loop expects the callback function to have a paramter, while | |
165 | readline expects none. */ | |
c2c6d25f JM |
166 | static void |
167 | rl_callback_read_char_wrapper (gdb_client_data client_data) | |
168 | { | |
169 | rl_callback_read_char (); | |
467d8519 TT |
170 | if (after_char_processing_hook) |
171 | (*after_char_processing_hook) (); | |
c2c6d25f JM |
172 | } |
173 | ||
b5a0ac70 | 174 | /* Initialize all the necessary variables, start the event loop, |
371d5dec | 175 | register readline, and stdin, start the loop. */ |
b5a0ac70 | 176 | void |
c2c6d25f | 177 | cli_command_loop (void) |
b5a0ac70 | 178 | { |
7d8e6458 | 179 | display_gdb_prompt (0); |
b5a0ac70 | 180 | |
371d5dec | 181 | /* Now it's time to start the event loop. */ |
085dd6e6 | 182 | start_event_loop (); |
b5a0ac70 SS |
183 | } |
184 | ||
185 | /* Change the function to be invoked every time there is a character | |
371d5dec | 186 | ready on stdin. This is used when the user sets the editing off, |
b5a0ac70 | 187 | therefore bypassing readline, and letting gdb handle the input |
371d5dec | 188 | itself, via gdb_readline2. Also it is used in the opposite case in |
b5a0ac70 | 189 | which the user sets editing on again, by restoring readline |
371d5dec | 190 | handling of the input. */ |
392a587b | 191 | static void |
c2c6d25f | 192 | change_line_handler (void) |
b5a0ac70 | 193 | { |
371d5dec MS |
194 | /* NOTE: this operates on input_fd, not instream. If we are reading |
195 | commands from a file, instream will point to the file. However in | |
c2c6d25f | 196 | async mode, we always read commands from a file with editing |
371d5dec MS |
197 | off. This means that the 'set editing on/off' will have effect |
198 | only on the interactive session. */ | |
c2c6d25f | 199 | |
b5a0ac70 SS |
200 | if (async_command_editing_p) |
201 | { | |
371d5dec | 202 | /* Turn on editing by using readline. */ |
c2c6d25f | 203 | call_readline = rl_callback_read_char_wrapper; |
0f71a2f6 | 204 | input_handler = command_line_handler; |
b5a0ac70 SS |
205 | } |
206 | else | |
207 | { | |
371d5dec | 208 | /* Turn off editing by using gdb_readline2. */ |
b5a0ac70 SS |
209 | rl_callback_handler_remove (); |
210 | call_readline = gdb_readline2; | |
0f71a2f6 JM |
211 | |
212 | /* Set up the command handler as well, in case we are called as | |
371d5dec | 213 | first thing from .gdbinit. */ |
0f71a2f6 | 214 | input_handler = command_line_handler; |
b5a0ac70 | 215 | } |
b5a0ac70 SS |
216 | } |
217 | ||
ab821bc6 PA |
218 | /* Displays the prompt. If the argument NEW_PROMPT is NULL, the |
219 | prompt that is displayed is the current top level prompt. | |
220 | Otherwise, it displays whatever NEW_PROMPT is as a local/secondary | |
221 | prompt. | |
222 | ||
223 | This is used after each gdb command has completed, and in the | |
224 | following cases: | |
225 | ||
371d5dec | 226 | 1. When the user enters a command line which is ended by '\' |
ab821bc6 PA |
227 | indicating that the command will continue on the next line. In |
228 | that case the prompt that is displayed is the empty string. | |
229 | ||
0f71a2f6 | 230 | 2. When the user is entering 'commands' for a breakpoint, or |
371d5dec | 231 | actions for a tracepoint. In this case the prompt will be '>' |
ab821bc6 PA |
232 | |
233 | 3. On prompting for pagination. */ | |
234 | ||
b5a0ac70 | 235 | void |
c2c6d25f | 236 | display_gdb_prompt (char *new_prompt) |
b5a0ac70 | 237 | { |
d17b6f81 | 238 | char *actual_gdb_prompt = NULL; |
ab821bc6 | 239 | struct cleanup *old_chain; |
b5a0ac70 | 240 | |
16026cd7 AS |
241 | /* Reset the nesting depth used when trace-commands is set. */ |
242 | reset_command_nest_depth (); | |
243 | ||
4389a95a AC |
244 | /* Each interpreter has its own rules on displaying the command |
245 | prompt. */ | |
246 | if (!current_interp_display_prompt_p ()) | |
fb40c209 | 247 | return; |
fb40c209 | 248 | |
ab821bc6 | 249 | old_chain = make_cleanup (free_current_contents, &actual_gdb_prompt); |
d17b6f81 | 250 | |
ab821bc6 PA |
251 | /* Do not call the python hook on an explicit prompt change as |
252 | passed to this function, as this forms a secondary/local prompt, | |
253 | IE, displayed but not set. */ | |
254 | if (! new_prompt) | |
adf40b2e | 255 | { |
ab821bc6 | 256 | if (sync_execution) |
d17b6f81 | 257 | { |
ab821bc6 PA |
258 | /* This is to trick readline into not trying to display the |
259 | prompt. Even though we display the prompt using this | |
260 | function, readline still tries to do its own display if | |
261 | we don't call rl_callback_handler_install and | |
262 | rl_callback_handler_remove (which readline detects | |
263 | because a global variable is not set). If readline did | |
264 | that, it could mess up gdb signal handlers for SIGINT. | |
265 | Readline assumes that between calls to rl_set_signals and | |
266 | rl_clear_signals gdb doesn't do anything with the signal | |
267 | handlers. Well, that's not the case, because when the | |
268 | target executes we change the SIGINT signal handler. If | |
269 | we allowed readline to display the prompt, the signal | |
270 | handler change would happen exactly between the calls to | |
271 | the above two functions. Calling | |
272 | rl_callback_handler_remove(), does the job. */ | |
273 | ||
274 | rl_callback_handler_remove (); | |
275 | return; | |
d17b6f81 PM |
276 | } |
277 | else | |
ab821bc6 PA |
278 | { |
279 | /* Display the top level prompt. */ | |
280 | actual_gdb_prompt = top_level_prompt (); | |
281 | } | |
b5a0ac70 | 282 | } |
ab821bc6 PA |
283 | else |
284 | actual_gdb_prompt = xstrdup (new_prompt); | |
b5a0ac70 SS |
285 | |
286 | if (async_command_editing_p) | |
287 | { | |
288 | rl_callback_handler_remove (); | |
d17b6f81 | 289 | rl_callback_handler_install (actual_gdb_prompt, input_handler); |
b5a0ac70 | 290 | } |
371d5dec | 291 | /* new_prompt at this point can be the top of the stack or the one |
d014929c MS |
292 | passed in. It can't be NULL. */ |
293 | else | |
b5a0ac70 SS |
294 | { |
295 | /* Don't use a _filtered function here. It causes the assumed | |
296 | character position to be off, since the newline we read from | |
297 | the user is not accounted for. */ | |
d17b6f81 | 298 | fputs_unfiltered (actual_gdb_prompt, gdb_stdout); |
b5a0ac70 SS |
299 | gdb_flush (gdb_stdout); |
300 | } | |
ab821bc6 PA |
301 | |
302 | do_cleanups (old_chain); | |
b5a0ac70 SS |
303 | } |
304 | ||
ab821bc6 PA |
305 | /* Return the top level prompt, as specified by "set prompt", possibly |
306 | overriden by the python gdb.prompt_hook hook, and then composed | |
307 | with the prompt prefix and suffix (annotations). The caller is | |
308 | responsible for freeing the returned string. */ | |
309 | ||
310 | static char * | |
311 | top_level_prompt (void) | |
b5a0ac70 | 312 | { |
ab821bc6 PA |
313 | char *prefix; |
314 | char *prompt = NULL; | |
315 | char *suffix; | |
316 | char *composed_prompt; | |
317 | size_t prompt_length; | |
b5a0ac70 | 318 | |
ab821bc6 PA |
319 | /* Give observers a chance of changing the prompt. E.g., the python |
320 | `gdb.prompt_hook' is installed as an observer. */ | |
321 | observer_notify_before_prompt (get_prompt ()); | |
322 | ||
323 | prompt = xstrdup (get_prompt ()); | |
b5a0ac70 | 324 | |
ab821bc6 | 325 | if (annotation_level >= 2) |
b5a0ac70 | 326 | { |
ab821bc6 PA |
327 | /* Prefix needs to have new line at end. */ |
328 | prefix = (char *) alloca (strlen (async_annotation_suffix) + 10); | |
329 | strcpy (prefix, "\n\032\032pre-"); | |
330 | strcat (prefix, async_annotation_suffix); | |
331 | strcat (prefix, "\n"); | |
332 | ||
333 | /* Suffix needs to have a new line at end and \032 \032 at | |
334 | beginning. */ | |
335 | suffix = (char *) alloca (strlen (async_annotation_suffix) + 6); | |
336 | strcpy (suffix, "\n\032\032"); | |
337 | strcat (suffix, async_annotation_suffix); | |
338 | strcat (suffix, "\n"); | |
b5a0ac70 SS |
339 | } |
340 | else | |
341 | { | |
ab821bc6 PA |
342 | prefix = ""; |
343 | suffix = ""; | |
b5a0ac70 | 344 | } |
b5a0ac70 | 345 | |
ab821bc6 PA |
346 | prompt_length = strlen (prefix) + strlen (prompt) + strlen (suffix); |
347 | composed_prompt = xmalloc (prompt_length + 1); | |
b5a0ac70 | 348 | |
ab821bc6 PA |
349 | strcpy (composed_prompt, prefix); |
350 | strcat (composed_prompt, prompt); | |
351 | strcat (composed_prompt, suffix); | |
b5a0ac70 | 352 | |
ab821bc6 PA |
353 | xfree (prompt); |
354 | ||
355 | return composed_prompt; | |
b5a0ac70 | 356 | } |
c2c6d25f JM |
357 | |
358 | /* When there is an event ready on the stdin file desriptor, instead | |
359 | of calling readline directly throught the callback function, or | |
360 | instead of calling gdb_readline2, give gdb a chance to detect | |
371d5dec | 361 | errors and do something. */ |
c2c6d25f | 362 | void |
2acceee2 | 363 | stdin_event_handler (int error, gdb_client_data client_data) |
c2c6d25f JM |
364 | { |
365 | if (error) | |
366 | { | |
a3f17187 | 367 | printf_unfiltered (_("error detected on stdin\n")); |
2acceee2 | 368 | delete_file_handler (input_fd); |
c2c6d25f | 369 | discard_all_continuations (); |
604ead4a | 370 | discard_all_intermediate_continuations (); |
371d5dec | 371 | /* If stdin died, we may as well kill gdb. */ |
c5394b80 | 372 | quit_command ((char *) 0, stdin == instream); |
c2c6d25f JM |
373 | } |
374 | else | |
6426a772 | 375 | (*call_readline) (client_data); |
c2c6d25f JM |
376 | } |
377 | ||
6426a772 JM |
378 | /* Re-enable stdin after the end of an execution command in |
379 | synchronous mode, or after an error from the target, and we aborted | |
371d5dec | 380 | the exec operation. */ |
6426a772 JM |
381 | |
382 | void | |
712af3be | 383 | async_enable_stdin (void) |
6426a772 | 384 | { |
32c1e744 VP |
385 | if (sync_execution) |
386 | { | |
371d5dec | 387 | /* See NOTE in async_disable_stdin(). */ |
32c1e744 VP |
388 | /* FIXME: cagney/1999-09-27: Call this before clearing |
389 | sync_execution. Current target_terminal_ours() implementations | |
371d5dec | 390 | check for sync_execution before switching the terminal. */ |
32c1e744 | 391 | target_terminal_ours (); |
32c1e744 VP |
392 | sync_execution = 0; |
393 | } | |
6426a772 JM |
394 | } |
395 | ||
396 | /* Disable reads from stdin (the console) marking the command as | |
371d5dec | 397 | synchronous. */ |
6426a772 JM |
398 | |
399 | void | |
400 | async_disable_stdin (void) | |
401 | { | |
ab821bc6 | 402 | sync_execution = 1; |
6426a772 | 403 | } |
b5a0ac70 | 404 | \f |
6426a772 | 405 | |
371d5dec | 406 | /* Handles a gdb command. This function is called by |
b5a0ac70 | 407 | command_line_handler, which has processed one or more input lines |
371d5dec | 408 | into COMMAND. */ |
392a587b | 409 | /* NOTE: 1999-04-30 This is the asynchronous version of the command_loop |
b5a0ac70 | 410 | function. The command_loop function will be obsolete when we |
371d5dec | 411 | switch to use the event loop at every execution of gdb. */ |
392a587b | 412 | static void |
c2c6d25f | 413 | command_handler (char *command) |
b5a0ac70 | 414 | { |
b5a0ac70 | 415 | int stdin_is_tty = ISATTY (stdin); |
0f3bb72e | 416 | struct cleanup *stat_chain; |
b5a0ac70 | 417 | |
b5a0ac70 SS |
418 | quit_flag = 0; |
419 | if (instream == stdin && stdin_is_tty) | |
420 | reinitialize_more_filter (); | |
b5a0ac70 | 421 | |
371d5dec MS |
422 | /* If readline returned a NULL command, it means that the connection |
423 | with the terminal is gone. This happens at the end of a | |
424 | testsuite run, after Expect has hung up but GDB is still alive. | |
425 | In such a case, we just quit gdb killing the inferior program | |
426 | too. */ | |
b5a0ac70 | 427 | if (command == 0) |
fa3fd85b AS |
428 | { |
429 | printf_unfiltered ("quit\n"); | |
430 | execute_command ("quit", stdin == instream); | |
431 | } | |
b5a0ac70 | 432 | |
0f3bb72e | 433 | stat_chain = make_command_stats_cleanup (1); |
b5a0ac70 SS |
434 | |
435 | execute_command (command, instream == stdin); | |
c5aa993b | 436 | |
347bddb7 PA |
437 | /* Do any commands attached to breakpoint we stopped at. */ |
438 | bpstat_do_actions (); | |
c5aa993b | 439 | |
0f3bb72e | 440 | do_cleanups (stat_chain); |
43ff13b4 JM |
441 | } |
442 | ||
371d5dec MS |
443 | /* Handle a complete line of input. This is called by the callback |
444 | mechanism within the readline library. Deal with incomplete | |
445 | commands as well, by saving the partial input in a global | |
446 | buffer. */ | |
b5a0ac70 | 447 | |
392a587b | 448 | /* NOTE: 1999-04-30 This is the asynchronous version of the |
371d5dec | 449 | command_line_input function; command_line_input will become |
b5a0ac70 | 450 | obsolete once we use the event loop as the default mechanism in |
371d5dec | 451 | GDB. */ |
b5a0ac70 | 452 | static void |
c2c6d25f | 453 | command_line_handler (char *rl) |
b5a0ac70 SS |
454 | { |
455 | static char *linebuffer = 0; | |
456 | static unsigned linelength = 0; | |
52f0bd74 | 457 | char *p; |
b5a0ac70 | 458 | char *p1; |
b5a0ac70 SS |
459 | char *nline; |
460 | char got_eof = 0; | |
461 | ||
b5a0ac70 SS |
462 | int repeat = (instream == stdin); |
463 | ||
464 | if (annotation_level > 1 && instream == stdin) | |
465 | { | |
a3f17187 | 466 | printf_unfiltered (("\n\032\032post-")); |
306d9ac5 | 467 | puts_unfiltered (async_annotation_suffix); |
a3f17187 | 468 | printf_unfiltered (("\n")); |
b5a0ac70 SS |
469 | } |
470 | ||
471 | if (linebuffer == 0) | |
472 | { | |
473 | linelength = 80; | |
474 | linebuffer = (char *) xmalloc (linelength); | |
475 | } | |
476 | ||
477 | p = linebuffer; | |
478 | ||
479 | if (more_to_come) | |
480 | { | |
481 | strcpy (linebuffer, readline_input_state.linebuffer); | |
482 | p = readline_input_state.linebuffer_ptr; | |
b8c9b27d | 483 | xfree (readline_input_state.linebuffer); |
b5a0ac70 | 484 | more_to_come = 0; |
b5a0ac70 SS |
485 | } |
486 | ||
487 | #ifdef STOP_SIGNAL | |
488 | if (job_control) | |
0f71a2f6 | 489 | signal (STOP_SIGNAL, handle_stop_sig); |
b5a0ac70 SS |
490 | #endif |
491 | ||
492 | /* Make sure that all output has been output. Some machines may let | |
371d5dec MS |
493 | you get away with leaving out some of the gdb_flush, but not |
494 | all. */ | |
b5a0ac70 SS |
495 | wrap_here (""); |
496 | gdb_flush (gdb_stdout); | |
497 | gdb_flush (gdb_stderr); | |
498 | ||
499 | if (source_file_name != NULL) | |
637537d0 | 500 | ++source_line_number; |
b5a0ac70 SS |
501 | |
502 | /* If we are in this case, then command_handler will call quit | |
371d5dec | 503 | and exit from gdb. */ |
b5a0ac70 SS |
504 | if (!rl || rl == (char *) EOF) |
505 | { | |
506 | got_eof = 1; | |
507 | command_handler (0); | |
371d5dec | 508 | return; /* Lint. */ |
b5a0ac70 SS |
509 | } |
510 | if (strlen (rl) + 1 + (p - linebuffer) > linelength) | |
511 | { | |
512 | linelength = strlen (rl) + 1 + (p - linebuffer); | |
513 | nline = (char *) xrealloc (linebuffer, linelength); | |
514 | p += nline - linebuffer; | |
515 | linebuffer = nline; | |
516 | } | |
517 | p1 = rl; | |
518 | /* Copy line. Don't copy null at end. (Leaves line alone | |
371d5dec | 519 | if this was just a newline). */ |
b5a0ac70 SS |
520 | while (*p1) |
521 | *p++ = *p1++; | |
522 | ||
b8c9b27d | 523 | xfree (rl); /* Allocated in readline. */ |
b5a0ac70 | 524 | |
4dd79c29 | 525 | if (p > linebuffer && *(p - 1) == '\\') |
b5a0ac70 | 526 | { |
20bb6bc8 | 527 | *p = '\0'; |
b5a0ac70 SS |
528 | p--; /* Put on top of '\'. */ |
529 | ||
1b36a34b | 530 | readline_input_state.linebuffer = xstrdup (linebuffer); |
d96429cd AS |
531 | readline_input_state.linebuffer_ptr = p; |
532 | ||
533 | /* We will not invoke a execute_command if there is more | |
371d5dec MS |
534 | input expected to complete the command. So, we need to |
535 | print an empty prompt here. */ | |
d96429cd | 536 | more_to_come = 1; |
ab821bc6 | 537 | display_gdb_prompt (""); |
d96429cd | 538 | return; |
b5a0ac70 SS |
539 | } |
540 | ||
541 | #ifdef STOP_SIGNAL | |
542 | if (job_control) | |
543 | signal (STOP_SIGNAL, SIG_DFL); | |
544 | #endif | |
545 | ||
546 | #define SERVER_COMMAND_LENGTH 7 | |
547 | server_command = | |
548 | (p - linebuffer > SERVER_COMMAND_LENGTH) | |
bf896cb0 | 549 | && strncmp (linebuffer, "server ", SERVER_COMMAND_LENGTH) == 0; |
b5a0ac70 SS |
550 | if (server_command) |
551 | { | |
552 | /* Note that we don't set `line'. Between this and the check in | |
553 | dont_repeat, this insures that repeating will still do the | |
554 | right thing. */ | |
555 | *p = '\0'; | |
556 | command_handler (linebuffer + SERVER_COMMAND_LENGTH); | |
557 | display_gdb_prompt (0); | |
558 | return; | |
559 | } | |
560 | ||
561 | /* Do history expansion if that is wished. */ | |
562 | if (history_expansion_p && instream == stdin | |
563 | && ISATTY (instream)) | |
564 | { | |
565 | char *history_value; | |
566 | int expanded; | |
567 | ||
568 | *p = '\0'; /* Insert null now. */ | |
569 | expanded = history_expand (linebuffer, &history_value); | |
570 | if (expanded) | |
571 | { | |
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); |
b5a0ac70 SS |
579 | return; |
580 | } | |
581 | if (strlen (history_value) > linelength) | |
582 | { | |
583 | linelength = strlen (history_value) + 1; | |
584 | linebuffer = (char *) xrealloc (linebuffer, linelength); | |
585 | } | |
586 | strcpy (linebuffer, history_value); | |
587 | p = linebuffer + strlen (linebuffer); | |
b5a0ac70 | 588 | } |
f5b73fbb | 589 | xfree (history_value); |
b5a0ac70 SS |
590 | } |
591 | ||
371d5dec MS |
592 | /* If we just got an empty line, and that is supposed to repeat the |
593 | previous command, return the value in the global buffer. */ | |
b5a0ac70 SS |
594 | if (repeat && p == linebuffer && *p != '\\') |
595 | { | |
dc7eb48e | 596 | command_handler (saved_command_line); |
b5a0ac70 SS |
597 | display_gdb_prompt (0); |
598 | return; | |
599 | } | |
600 | ||
601 | for (p1 = linebuffer; *p1 == ' ' || *p1 == '\t'; p1++); | |
602 | if (repeat && !*p1) | |
603 | { | |
dc7eb48e | 604 | command_handler (saved_command_line); |
b5a0ac70 SS |
605 | display_gdb_prompt (0); |
606 | return; | |
607 | } | |
608 | ||
609 | *p = 0; | |
610 | ||
611 | /* Add line to history if appropriate. */ | |
612 | if (instream == stdin | |
613 | && ISATTY (stdin) && *linebuffer) | |
614 | add_history (linebuffer); | |
615 | ||
616 | /* Note: lines consisting solely of comments are added to the command | |
617 | history. This is useful when you type a command, and then | |
618 | realize you don't want to execute it quite yet. You can comment | |
619 | out the command and then later fetch it from the value history | |
620 | and remove the '#'. The kill ring is probably better, but some | |
621 | people are in the habit of commenting things out. */ | |
622 | if (*p1 == '#') | |
371d5dec | 623 | *p1 = '\0'; /* Found a comment. */ |
b5a0ac70 SS |
624 | |
625 | /* Save into global buffer if appropriate. */ | |
626 | if (repeat) | |
627 | { | |
dc7eb48e | 628 | if (linelength > saved_command_line_size) |
b5a0ac70 | 629 | { |
dc7eb48e PA |
630 | saved_command_line = xrealloc (saved_command_line, linelength); |
631 | saved_command_line_size = linelength; | |
b5a0ac70 | 632 | } |
dc7eb48e | 633 | strcpy (saved_command_line, linebuffer); |
b5a0ac70 SS |
634 | if (!more_to_come) |
635 | { | |
dc7eb48e | 636 | command_handler (saved_command_line); |
b5a0ac70 SS |
637 | display_gdb_prompt (0); |
638 | } | |
639 | return; | |
640 | } | |
641 | ||
642 | command_handler (linebuffer); | |
643 | display_gdb_prompt (0); | |
644 | return; | |
645 | } | |
646 | ||
647 | /* Does reading of input from terminal w/o the editing features | |
371d5dec | 648 | provided by the readline library. */ |
b5a0ac70 | 649 | |
371d5dec | 650 | /* NOTE: 1999-04-30 Asynchronous version of gdb_readline; gdb_readline |
b5a0ac70 | 651 | will become obsolete when the event loop is made the default |
371d5dec | 652 | execution for gdb. */ |
085dd6e6 | 653 | void |
c2c6d25f | 654 | gdb_readline2 (gdb_client_data client_data) |
b5a0ac70 SS |
655 | { |
656 | int c; | |
657 | char *result; | |
658 | int input_index = 0; | |
659 | int result_size = 80; | |
7be570e7 JM |
660 | static int done_once = 0; |
661 | ||
662 | /* Unbuffer the input stream, so that, later on, the calls to fgetc | |
371d5dec | 663 | fetch only one char at the time from the stream. The fgetc's will |
7be570e7 | 664 | get up to the first newline, but there may be more chars in the |
371d5dec | 665 | stream after '\n'. If we buffer the input and fgetc drains the |
7be570e7 | 666 | stream, getting stuff beyond the newline as well, a select, done |
371d5dec | 667 | afterwards will not trigger. */ |
7be570e7 JM |
668 | if (!done_once && !ISATTY (instream)) |
669 | { | |
670 | setbuf (instream, NULL); | |
671 | done_once = 1; | |
672 | } | |
b5a0ac70 SS |
673 | |
674 | result = (char *) xmalloc (result_size); | |
675 | ||
676 | /* We still need the while loop here, even though it would seem | |
677 | obvious to invoke gdb_readline2 at every character entered. If | |
678 | not using the readline library, the terminal is in cooked mode, | |
371d5dec MS |
679 | which sends the characters all at once. Poll will notice that the |
680 | input fd has changed state only after enter is pressed. At this | |
681 | point we still need to fetch all the chars entered. */ | |
b5a0ac70 SS |
682 | |
683 | while (1) | |
684 | { | |
685 | /* Read from stdin if we are executing a user defined command. | |
686 | This is the right thing for prompt_for_continue, at least. */ | |
687 | c = fgetc (instream ? instream : stdin); | |
688 | ||
689 | if (c == EOF) | |
690 | { | |
691 | if (input_index > 0) | |
371d5dec MS |
692 | /* The last line does not end with a newline. Return it, |
693 | and if we are called again fgetc will still return EOF | |
694 | and we'll return NULL then. */ | |
b5a0ac70 | 695 | break; |
b8c9b27d | 696 | xfree (result); |
0f71a2f6 | 697 | (*input_handler) (0); |
13ce7133 | 698 | return; |
b5a0ac70 SS |
699 | } |
700 | ||
701 | if (c == '\n') | |
b5a0ac70 SS |
702 | { |
703 | if (input_index > 0 && result[input_index - 1] == '\r') | |
704 | input_index--; | |
705 | break; | |
706 | } | |
b5a0ac70 SS |
707 | |
708 | result[input_index++] = c; | |
709 | while (input_index >= result_size) | |
710 | { | |
711 | result_size *= 2; | |
712 | result = (char *) xrealloc (result, result_size); | |
713 | } | |
714 | } | |
715 | ||
716 | result[input_index++] = '\0'; | |
0f71a2f6 | 717 | (*input_handler) (result); |
b5a0ac70 SS |
718 | } |
719 | \f | |
720 | ||
721 | /* Initialization of signal handlers and tokens. There is a function | |
371d5dec | 722 | handle_sig* for each of the signals GDB cares about. Specifically: |
b5a0ac70 SS |
723 | SIGINT, SIGFPE, SIGQUIT, SIGTSTP, SIGHUP, SIGWINCH. These |
724 | functions are the actual signal handlers associated to the signals | |
725 | via calls to signal(). The only job for these functions is to | |
726 | enqueue the appropriate event/procedure with the event loop. Such | |
371d5dec | 727 | procedures are the old signal handlers. The event loop will take |
b5a0ac70 | 728 | care of invoking the queued procedures to perform the usual tasks |
371d5dec | 729 | associated with the reception of the signal. */ |
392a587b | 730 | /* NOTE: 1999-04-30 This is the asynchronous version of init_signals. |
b5a0ac70 | 731 | init_signals will become obsolete as we move to have to event loop |
371d5dec | 732 | as the default for gdb. */ |
b5a0ac70 | 733 | void |
c2c6d25f | 734 | async_init_signals (void) |
c5aa993b | 735 | { |
b5a0ac70 SS |
736 | signal (SIGINT, handle_sigint); |
737 | sigint_token = | |
0f71a2f6 | 738 | create_async_signal_handler (async_request_quit, NULL); |
a7266fef | 739 | signal (SIGTERM, handle_sigterm); |
b5a0ac70 SS |
740 | |
741 | /* If SIGTRAP was set to SIG_IGN, then the SIG_IGN will get passed | |
742 | to the inferior and breakpoints will be ignored. */ | |
743 | #ifdef SIGTRAP | |
744 | signal (SIGTRAP, SIG_DFL); | |
745 | #endif | |
746 | ||
6d318c73 | 747 | #ifdef SIGQUIT |
b5a0ac70 SS |
748 | /* If we initialize SIGQUIT to SIG_IGN, then the SIG_IGN will get |
749 | passed to the inferior, which we don't want. It would be | |
750 | possible to do a "signal (SIGQUIT, SIG_DFL)" after we fork, but | |
751 | on BSD4.3 systems using vfork, that can affect the | |
752 | GDB process as well as the inferior (the signal handling tables | |
753 | might be in memory, shared between the two). Since we establish | |
754 | a handler for SIGQUIT, when we call exec it will set the signal | |
755 | to SIG_DFL for us. */ | |
756 | signal (SIGQUIT, handle_sigquit); | |
757 | sigquit_token = | |
0f71a2f6 | 758 | create_async_signal_handler (async_do_nothing, NULL); |
6d318c73 | 759 | #endif |
b5a0ac70 SS |
760 | #ifdef SIGHUP |
761 | if (signal (SIGHUP, handle_sighup) != SIG_IGN) | |
762 | sighup_token = | |
0f71a2f6 | 763 | create_async_signal_handler (async_disconnect, NULL); |
b5a0ac70 SS |
764 | else |
765 | sighup_token = | |
0f71a2f6 | 766 | create_async_signal_handler (async_do_nothing, NULL); |
b5a0ac70 SS |
767 | #endif |
768 | signal (SIGFPE, handle_sigfpe); | |
769 | sigfpe_token = | |
0f71a2f6 | 770 | create_async_signal_handler (async_float_handler, NULL); |
b5a0ac70 SS |
771 | |
772 | #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER) | |
773 | signal (SIGWINCH, handle_sigwinch); | |
774 | sigwinch_token = | |
0f71a2f6 | 775 | create_async_signal_handler (SIGWINCH_HANDLER, NULL); |
b5a0ac70 | 776 | #endif |
0f71a2f6 JM |
777 | #ifdef STOP_SIGNAL |
778 | sigtstp_token = | |
779 | create_async_signal_handler (async_stop_sig, NULL); | |
780 | #endif | |
781 | ||
782 | } | |
783 | ||
c5aa993b | 784 | void |
97bb9d91 | 785 | mark_async_signal_handler_wrapper (void *token) |
0f71a2f6 | 786 | { |
c2c6d25f | 787 | mark_async_signal_handler ((struct async_signal_handler *) token); |
b5a0ac70 SS |
788 | } |
789 | ||
371d5dec MS |
790 | /* Tell the event loop what to do if SIGINT is received. |
791 | See event-signal.c. */ | |
c5aa993b | 792 | void |
c2c6d25f | 793 | handle_sigint (int sig) |
b5a0ac70 SS |
794 | { |
795 | signal (sig, handle_sigint); | |
796 | ||
5f960e00 FF |
797 | /* We could be running in a loop reading in symfiles or something so |
798 | it may be quite a while before we get back to the event loop. So | |
371d5dec | 799 | set quit_flag to 1 here. Then if QUIT is called before we get to |
5f960e00 FF |
800 | the event loop, we will unwind as expected. */ |
801 | ||
802 | quit_flag = 1; | |
803 | ||
b5a0ac70 | 804 | /* If immediate_quit is set, we go ahead and process the SIGINT right |
371d5dec | 805 | away, even if we usually would defer this to the event loop. The |
b5a0ac70 | 806 | assumption here is that it is safe to process ^C immediately if |
371d5dec | 807 | immediate_quit is set. If we didn't, SIGINT would be really |
b5a0ac70 SS |
808 | processed only the next time through the event loop. To get to |
809 | that point, though, the command that we want to interrupt needs to | |
b803fb0f | 810 | finish first, which is unacceptable. If immediate quit is not set, |
371d5dec | 811 | we process SIGINT the next time through the loop, which is fine. */ |
b803fb0f | 812 | gdb_call_async_signal_handler (sigint_token, immediate_quit); |
b5a0ac70 SS |
813 | } |
814 | ||
a7266fef AS |
815 | /* Quit GDB if SIGTERM is received. |
816 | GDB would quit anyway, but this way it will clean up properly. */ | |
817 | void | |
818 | handle_sigterm (int sig) | |
819 | { | |
820 | signal (sig, handle_sigterm); | |
821 | quit_force ((char *) 0, stdin == instream); | |
822 | } | |
823 | ||
371d5dec | 824 | /* Do the quit. All the checks have been done by the caller. */ |
c5aa993b | 825 | void |
c2c6d25f | 826 | async_request_quit (gdb_client_data arg) |
b5a0ac70 | 827 | { |
5f960e00 | 828 | /* If the quit_flag has gotten reset back to 0 by the time we get |
4ac94eda FF |
829 | back here, that means that an exception was thrown to unwind the |
830 | current command before we got back to the event loop. So there | |
831 | is no reason to call quit again here, unless immediate_quit is | |
371d5dec | 832 | set. */ |
5f960e00 | 833 | |
4ac94eda FF |
834 | if (quit_flag || immediate_quit) |
835 | quit (); | |
b5a0ac70 SS |
836 | } |
837 | ||
6d318c73 | 838 | #ifdef SIGQUIT |
371d5dec MS |
839 | /* Tell the event loop what to do if SIGQUIT is received. |
840 | See event-signal.c. */ | |
c5aa993b | 841 | static void |
c2c6d25f | 842 | handle_sigquit (int sig) |
b5a0ac70 | 843 | { |
0f71a2f6 | 844 | mark_async_signal_handler_wrapper (sigquit_token); |
b5a0ac70 SS |
845 | signal (sig, handle_sigquit); |
846 | } | |
6d318c73 | 847 | #endif |
b5a0ac70 | 848 | |
0f0b8dcd DJ |
849 | #if defined (SIGQUIT) || defined (SIGHUP) |
850 | /* Called by the event loop in response to a SIGQUIT or an | |
851 | ignored SIGHUP. */ | |
c5aa993b | 852 | static void |
c2c6d25f | 853 | async_do_nothing (gdb_client_data arg) |
b5a0ac70 | 854 | { |
371d5dec | 855 | /* Empty function body. */ |
b5a0ac70 | 856 | } |
0f0b8dcd | 857 | #endif |
b5a0ac70 SS |
858 | |
859 | #ifdef SIGHUP | |
371d5dec MS |
860 | /* Tell the event loop what to do if SIGHUP is received. |
861 | See event-signal.c. */ | |
c5aa993b | 862 | static void |
fba45db2 | 863 | handle_sighup (int sig) |
b5a0ac70 | 864 | { |
0f71a2f6 | 865 | mark_async_signal_handler_wrapper (sighup_token); |
b5a0ac70 SS |
866 | signal (sig, handle_sighup); |
867 | } | |
868 | ||
371d5dec | 869 | /* Called by the event loop to process a SIGHUP. */ |
c5aa993b | 870 | static void |
c2c6d25f | 871 | async_disconnect (gdb_client_data arg) |
b5a0ac70 | 872 | { |
b2cd6b29 JM |
873 | volatile struct gdb_exception exception; |
874 | ||
875 | TRY_CATCH (exception, RETURN_MASK_ALL) | |
876 | { | |
877 | quit_cover (); | |
878 | } | |
879 | ||
880 | if (exception.reason < 0) | |
881 | { | |
882 | fputs_filtered ("Could not kill the program being debugged", | |
883 | gdb_stderr); | |
884 | exception_print (gdb_stderr, exception); | |
885 | } | |
886 | ||
887 | TRY_CATCH (exception, RETURN_MASK_ALL) | |
888 | { | |
889 | pop_all_targets (1); | |
890 | } | |
891 | ||
371d5dec | 892 | signal (SIGHUP, SIG_DFL); /*FIXME: ??????????? */ |
ec4dfccf | 893 | raise (SIGHUP); |
b5a0ac70 SS |
894 | } |
895 | #endif | |
896 | ||
0f71a2f6 | 897 | #ifdef STOP_SIGNAL |
c5aa993b | 898 | void |
c2c6d25f | 899 | handle_stop_sig (int sig) |
0f71a2f6 | 900 | { |
c5aa993b JM |
901 | mark_async_signal_handler_wrapper (sigtstp_token); |
902 | signal (sig, handle_stop_sig); | |
0f71a2f6 JM |
903 | } |
904 | ||
905 | static void | |
c2c6d25f | 906 | async_stop_sig (gdb_client_data arg) |
0f71a2f6 | 907 | { |
ab821bc6 | 908 | char *prompt = get_prompt (); |
d7f9d729 | 909 | |
0f71a2f6 JM |
910 | #if STOP_SIGNAL == SIGTSTP |
911 | signal (SIGTSTP, SIG_DFL); | |
2acceee2 JM |
912 | #if HAVE_SIGPROCMASK |
913 | { | |
914 | sigset_t zero; | |
46711df8 | 915 | |
2acceee2 JM |
916 | sigemptyset (&zero); |
917 | sigprocmask (SIG_SETMASK, &zero, 0); | |
918 | } | |
46711df8 | 919 | #elif HAVE_SIGSETMASK |
0f71a2f6 | 920 | sigsetmask (0); |
2acceee2 | 921 | #endif |
ec4dfccf | 922 | raise (SIGTSTP); |
0f71a2f6 JM |
923 | signal (SIGTSTP, handle_stop_sig); |
924 | #else | |
925 | signal (STOP_SIGNAL, handle_stop_sig); | |
926 | #endif | |
927 | printf_unfiltered ("%s", prompt); | |
928 | gdb_flush (gdb_stdout); | |
929 | ||
371d5dec MS |
930 | /* Forget about any previous command -- null line now will do |
931 | nothing. */ | |
0f71a2f6 JM |
932 | dont_repeat (); |
933 | } | |
934 | #endif /* STOP_SIGNAL */ | |
935 | ||
371d5dec MS |
936 | /* Tell the event loop what to do if SIGFPE is received. |
937 | See event-signal.c. */ | |
c5aa993b | 938 | static void |
c2c6d25f | 939 | handle_sigfpe (int sig) |
b5a0ac70 | 940 | { |
0f71a2f6 | 941 | mark_async_signal_handler_wrapper (sigfpe_token); |
b5a0ac70 SS |
942 | signal (sig, handle_sigfpe); |
943 | } | |
944 | ||
371d5dec | 945 | /* Event loop will call this functin to process a SIGFPE. */ |
c5aa993b | 946 | static void |
c2c6d25f | 947 | async_float_handler (gdb_client_data arg) |
b5a0ac70 | 948 | { |
371d5dec MS |
949 | /* This message is based on ANSI C, section 4.7. Note that integer |
950 | divide by zero causes this, so "float" is a misnomer. */ | |
8a3fe4f8 | 951 | error (_("Erroneous arithmetic operation.")); |
b5a0ac70 SS |
952 | } |
953 | ||
371d5dec MS |
954 | /* Tell the event loop what to do if SIGWINCH is received. |
955 | See event-signal.c. */ | |
b5a0ac70 | 956 | #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER) |
c5aa993b | 957 | static void |
c2c6d25f | 958 | handle_sigwinch (int sig) |
b5a0ac70 | 959 | { |
0f71a2f6 | 960 | mark_async_signal_handler_wrapper (sigwinch_token); |
b5a0ac70 SS |
961 | signal (sig, handle_sigwinch); |
962 | } | |
963 | #endif | |
964 | \f | |
965 | ||
966 | /* Called by do_setshow_command. */ | |
b5a0ac70 | 967 | void |
371d5dec MS |
968 | set_async_editing_command (char *args, int from_tty, |
969 | struct cmd_list_element *c) | |
b5a0ac70 SS |
970 | { |
971 | change_line_handler (); | |
972 | } | |
973 | ||
0f71a2f6 JM |
974 | /* Set things up for readline to be invoked via the alternate |
975 | interface, i.e. via a callback function (rl_callback_read_char), | |
371d5dec | 976 | and hook up instream to the event loop. */ |
0f71a2f6 | 977 | void |
cee6ddeb | 978 | gdb_setup_readline (void) |
0f71a2f6 | 979 | { |
362646f5 AC |
980 | /* This function is a noop for the sync case. The assumption is |
981 | that the sync setup is ALL done in gdb_init, and we would only | |
982 | mess it up here. The sync stuff should really go away over | |
983 | time. */ | |
1a088d06 AS |
984 | if (!batch_silent) |
985 | gdb_stdout = stdio_fileopen (stdout); | |
362646f5 AC |
986 | gdb_stderr = stdio_fileopen (stderr); |
987 | gdb_stdlog = gdb_stderr; /* for moment */ | |
988 | gdb_stdtarg = gdb_stderr; /* for moment */ | |
8d4d924b | 989 | gdb_stdtargerr = gdb_stderr; /* for moment */ |
362646f5 AC |
990 | |
991 | /* If the input stream is connected to a terminal, turn on | |
992 | editing. */ | |
993 | if (ISATTY (instream)) | |
9e0b60a8 | 994 | { |
371d5dec | 995 | /* Tell gdb that we will be using the readline library. This |
362646f5 AC |
996 | could be overwritten by a command in .gdbinit like 'set |
997 | editing on' or 'off'. */ | |
998 | async_command_editing_p = 1; | |
c5201926 | 999 | |
362646f5 AC |
1000 | /* When a character is detected on instream by select or poll, |
1001 | readline will be invoked via this callback function. */ | |
1002 | call_readline = rl_callback_read_char_wrapper; | |
9e0b60a8 | 1003 | } |
362646f5 AC |
1004 | else |
1005 | { | |
1006 | async_command_editing_p = 0; | |
1007 | call_readline = gdb_readline2; | |
1008 | } | |
1009 | ||
1010 | /* When readline has read an end-of-line character, it passes the | |
371d5dec | 1011 | complete line to gdb for processing; command_line_handler is the |
362646f5 AC |
1012 | function that does this. */ |
1013 | input_handler = command_line_handler; | |
1014 | ||
371d5dec | 1015 | /* Tell readline to use the same input stream that gdb uses. */ |
362646f5 AC |
1016 | rl_instream = instream; |
1017 | ||
1018 | /* Get a file descriptor for the input stream, so that we can | |
1019 | register it with the event loop. */ | |
1020 | input_fd = fileno (instream); | |
1021 | ||
1022 | /* Now we need to create the event sources for the input file | |
1023 | descriptor. */ | |
1024 | /* At this point in time, this is the only event source that we | |
371d5dec | 1025 | register with the even loop. Another source is going to be the |
362646f5 AC |
1026 | target program (inferior), but that must be registered only when |
1027 | it actually exists (I.e. after we say 'run' or after we connect | |
1028 | to a remote target. */ | |
1029 | add_file_handler (input_fd, stdin_event_handler, 0); | |
0f71a2f6 | 1030 | } |
cee6ddeb | 1031 | |
7d5b6fdd EZ |
1032 | /* Disable command input through the standard CLI channels. Used in |
1033 | the suspend proc for interpreters that use the standard gdb readline | |
1034 | interface, like the cli & the mi. */ | |
1035 | void | |
1036 | gdb_disable_readline (void) | |
1037 | { | |
362646f5 AC |
1038 | /* FIXME - It is too heavyweight to delete and remake these every |
1039 | time you run an interpreter that needs readline. It is probably | |
1040 | better to have the interpreters cache these, which in turn means | |
1041 | that this needs to be moved into interpreter specific code. */ | |
7d5b6fdd EZ |
1042 | |
1043 | #if 0 | |
362646f5 AC |
1044 | ui_file_delete (gdb_stdout); |
1045 | ui_file_delete (gdb_stderr); | |
1046 | gdb_stdlog = NULL; | |
1047 | gdb_stdtarg = NULL; | |
8d4d924b | 1048 | gdb_stdtargerr = NULL; |
7d5b6fdd EZ |
1049 | #endif |
1050 | ||
362646f5 AC |
1051 | rl_callback_handler_remove (); |
1052 | delete_file_handler (input_fd); | |
7d5b6fdd | 1053 | } |