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b5a0ac70 SS |
1 | /* Top level stuff for GDB, the GNU debugger. |
2 | Copyright 1999 Free Software Foundation, Inc. | |
3 | Written by Elena Zannoni <ezannoni@cygnus.com> of Cygnus Solutions. | |
4 | ||
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program; if not, write to the Free Software | |
c5aa993b JM |
19 | Foundation, Inc., 59 Temple Place - Suite 330, |
20 | Boston, MA 02111-1307, USA. */ | |
b5a0ac70 SS |
21 | |
22 | #include "defs.h" | |
0f71a2f6 | 23 | #include "top.h" |
b5a0ac70 | 24 | #include "inferior.h" |
c5aa993b | 25 | #include "terminal.h" /* for job_control */ |
c2c6d25f | 26 | #include "signals.h" |
9e0b60a8 | 27 | #include "event-loop.h" |
c2c6d25f | 28 | #include "event-top.h" |
b5a0ac70 | 29 | |
104c1213 JM |
30 | /* For dont_repeat() */ |
31 | #include "gdbcmd.h" | |
32 | ||
b5a0ac70 SS |
33 | /* readline include files */ |
34 | #include <readline/readline.h> | |
35 | #include <readline/history.h> | |
36 | ||
37 | /* readline defines this. */ | |
38 | #undef savestring | |
39 | ||
c2c6d25f | 40 | extern void _initialize_event_loop (void); |
b5a0ac70 | 41 | |
c2c6d25f JM |
42 | static void rl_callback_read_char_wrapper (gdb_client_data client_data); |
43 | static void command_line_handler (char *rl); | |
44 | static void command_line_handler_continuation (struct continuation_arg *arg); | |
45 | static void change_line_handler (void); | |
46 | static void change_annotation_level (void); | |
47 | static void command_handler (char *command); | |
48 | void cli_command_loop (void); | |
49 | static void async_do_nothing (gdb_client_data arg); | |
50 | static void async_disconnect (gdb_client_data arg); | |
51 | static void async_stop_sig (gdb_client_data arg); | |
52 | static void async_float_handler (gdb_client_data arg); | |
b5a0ac70 SS |
53 | |
54 | /* Signal handlers. */ | |
c2c6d25f JM |
55 | static void handle_sigquit (int sig); |
56 | static void handle_sighup (int sig); | |
57 | static void handle_sigfpe (int sig); | |
d4f3574e | 58 | #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER) |
c2c6d25f | 59 | static void handle_sigwinch (int sig); |
0f71a2f6 | 60 | #endif |
b5a0ac70 SS |
61 | |
62 | /* Functions to be invoked by the event loop in response to | |
63 | signals. */ | |
c2c6d25f JM |
64 | static void async_do_nothing (gdb_client_data); |
65 | static void async_disconnect (gdb_client_data); | |
66 | static void async_float_handler (gdb_client_data); | |
67 | static void async_stop_sig (gdb_client_data); | |
b5a0ac70 | 68 | |
b5a0ac70 SS |
69 | /* Readline offers an alternate interface, via callback |
70 | functions. These are all included in the file callback.c in the | |
71 | readline distribution. This file provides (mainly) a function, which | |
72 | the event loop uses as callback (i.e. event handler) whenever an event | |
73 | is detected on the standard input file descriptor. | |
74 | readline_callback_read_char is called (by the GDB event loop) whenever | |
75 | there is a new character ready on the input stream. This function | |
76 | incrementally builds a buffer internal to readline where it | |
77 | accumulates the line read up to the point of invocation. In the | |
78 | special case in which the character read is newline, the function | |
79 | invokes a GDB supplied callback routine, which does the processing of | |
80 | a full command line. This latter routine is the asynchronous analog | |
81 | of the old command_line_input in gdb. Instead of invoking (and waiting | |
82 | for) readline to read the command line and pass it back to | |
83 | command_loop for processing, the new command_line_handler function has | |
84 | the command line already available as its parameter. INPUT_HANDLER is | |
85 | to be set to the function that readline will invoke when a complete | |
86 | line of input is ready. CALL_READLINE is to be set to the function | |
87 | that readline offers as callback to the event_loop. */ | |
88 | ||
c2c6d25f JM |
89 | void (*input_handler) (char *); |
90 | void (*call_readline) (gdb_client_data); | |
b5a0ac70 SS |
91 | |
92 | /* Important variables for the event loop. */ | |
93 | ||
94 | /* This is used to determine if GDB is using the readline library or | |
95 | its own simplified form of readline. It is used by the asynchronous | |
0f71a2f6 | 96 | form of the set editing command. |
392a587b | 97 | ezannoni: as of 1999-04-29 I expect that this |
b5a0ac70 SS |
98 | variable will not be used after gdb is changed to use the event |
99 | loop as default engine, and event-top.c is merged into top.c. */ | |
100 | int async_command_editing_p; | |
101 | ||
102 | /* This variable contains the new prompt that the user sets with the | |
103 | set prompt command. */ | |
104 | char *new_async_prompt; | |
105 | ||
106 | /* This is the annotation suffix that will be used when the | |
107 | annotation_level is 2. */ | |
108 | char *async_annotation_suffix; | |
109 | ||
104c1213 JM |
110 | /* This is used to display the notification of the completion of an |
111 | asynchronous execution command. */ | |
112 | int exec_done_display_p = 0; | |
113 | ||
b5a0ac70 SS |
114 | /* This is the file descriptor for the input stream that GDB uses to |
115 | read commands from. */ | |
116 | int input_fd; | |
117 | ||
118 | /* This is the prompt stack. Prompts will be pushed on the stack as | |
119 | needed by the different 'kinds' of user inputs GDB is asking | |
120 | for. See event-loop.h. */ | |
121 | struct prompts the_prompts; | |
122 | ||
123 | /* signal handling variables */ | |
124 | /* Each of these is a pointer to a function that the event loop will | |
125 | invoke if the corresponding signal has received. The real signal | |
126 | handlers mark these functions as ready to be executed and the event | |
127 | loop, in a later iteration, calls them. See the function | |
128 | invoke_async_signal_handler. */ | |
0f71a2f6 | 129 | PTR sigint_token; |
b5a0ac70 | 130 | #ifdef SIGHUP |
0f71a2f6 | 131 | PTR sighup_token; |
b5a0ac70 | 132 | #endif |
0f71a2f6 JM |
133 | PTR sigquit_token; |
134 | PTR sigfpe_token; | |
b5a0ac70 | 135 | #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER) |
0f71a2f6 | 136 | PTR sigwinch_token; |
b5a0ac70 | 137 | #endif |
0f71a2f6 JM |
138 | #ifdef STOP_SIGNAL |
139 | PTR sigtstp_token; | |
140 | #endif | |
141 | ||
b5a0ac70 SS |
142 | /* Structure to save a partially entered command. This is used when |
143 | the user types '\' at the end of a command line. This is necessary | |
144 | because each line of input is handled by a different call to | |
145 | command_line_handler, and normally there is no state retained | |
146 | between different calls. */ | |
147 | int more_to_come = 0; | |
148 | ||
149 | struct readline_input_state | |
150 | { | |
151 | char *linebuffer; | |
152 | char *linebuffer_ptr; | |
153 | } | |
154 | readline_input_state; | |
155 | \f | |
156 | ||
c2c6d25f JM |
157 | /* Wrapper function foe calling into the readline library. The event |
158 | loop expects the callback function to have a paramter, while readline | |
159 | expects none. */ | |
160 | static void | |
161 | rl_callback_read_char_wrapper (gdb_client_data client_data) | |
162 | { | |
163 | rl_callback_read_char (); | |
164 | } | |
165 | ||
b5a0ac70 | 166 | /* Initialize all the necessary variables, start the event loop, |
085dd6e6 | 167 | register readline, and stdin, start the loop. */ |
b5a0ac70 | 168 | void |
c2c6d25f | 169 | cli_command_loop (void) |
b5a0ac70 | 170 | { |
0f71a2f6 JM |
171 | int length; |
172 | char *a_prompt; | |
9e0b60a8 | 173 | char *gdb_prompt = get_prompt (); |
b5a0ac70 | 174 | |
0f71a2f6 JM |
175 | /* If we are using readline, set things up and display the first |
176 | prompt, otherwise just print the prompt. */ | |
177 | if (async_command_editing_p) | |
178 | { | |
179 | /* Tell readline what the prompt to display is and what function it | |
c5aa993b JM |
180 | will need to call after a whole line is read. This also displays |
181 | the first prompt. */ | |
9e0b60a8 | 182 | length = strlen (PREFIX (0)) + strlen (gdb_prompt) + strlen (SUFFIX (0)) + 1; |
0f71a2f6 JM |
183 | a_prompt = (char *) xmalloc (length); |
184 | strcpy (a_prompt, PREFIX (0)); | |
9e0b60a8 | 185 | strcat (a_prompt, gdb_prompt); |
0f71a2f6 JM |
186 | strcat (a_prompt, SUFFIX (0)); |
187 | rl_callback_handler_install (a_prompt, input_handler); | |
188 | } | |
189 | else | |
190 | display_gdb_prompt (0); | |
b5a0ac70 | 191 | |
085dd6e6 JM |
192 | /* Now it's time to start the event loop. */ |
193 | start_event_loop (); | |
b5a0ac70 SS |
194 | } |
195 | ||
196 | /* Change the function to be invoked every time there is a character | |
197 | ready on stdin. This is used when the user sets the editing off, | |
198 | therefore bypassing readline, and letting gdb handle the input | |
199 | itself, via gdb_readline2. Also it is used in the opposite case in | |
200 | which the user sets editing on again, by restoring readline | |
201 | handling of the input. */ | |
392a587b | 202 | static void |
c2c6d25f | 203 | change_line_handler (void) |
b5a0ac70 | 204 | { |
c2c6d25f JM |
205 | /* NOTE: this operates on input_fd, not instream. If we are reading |
206 | commands from a file, instream will point to the file. However in | |
207 | async mode, we always read commands from a file with editing | |
208 | off. This means that the 'set editing on/off' will have effect | |
209 | only on the interactive session. */ | |
210 | ||
b5a0ac70 SS |
211 | if (async_command_editing_p) |
212 | { | |
213 | /* Turn on editing by using readline. */ | |
c2c6d25f | 214 | call_readline = rl_callback_read_char_wrapper; |
0f71a2f6 | 215 | input_handler = command_line_handler; |
b5a0ac70 SS |
216 | } |
217 | else | |
218 | { | |
219 | /* Turn off editing by using gdb_readline2. */ | |
220 | rl_callback_handler_remove (); | |
221 | call_readline = gdb_readline2; | |
0f71a2f6 JM |
222 | |
223 | /* Set up the command handler as well, in case we are called as | |
c5aa993b | 224 | first thing from .gdbinit. */ |
0f71a2f6 | 225 | input_handler = command_line_handler; |
b5a0ac70 | 226 | } |
b5a0ac70 SS |
227 | } |
228 | ||
229 | /* Displays the prompt. The prompt that is displayed is the current | |
230 | top of the prompt stack, if the argument NEW_PROMPT is | |
231 | 0. Otherwise, it displays whatever NEW_PROMPT is. This is used | |
232 | after each gdb command has completed, and in the following cases: | |
0f71a2f6 JM |
233 | 1. when the user enters a command line which is ended by '\' |
234 | indicating that the command will continue on the next line. | |
b5a0ac70 | 235 | In that case the prompt that is displayed is the empty string. |
0f71a2f6 JM |
236 | 2. When the user is entering 'commands' for a breakpoint, or |
237 | actions for a tracepoint. In this case the prompt will be '>' | |
238 | 3. Other???? | |
b5a0ac70 SS |
239 | FIXME: 2. & 3. not implemented yet for async. */ |
240 | void | |
c2c6d25f | 241 | display_gdb_prompt (char *new_prompt) |
b5a0ac70 SS |
242 | { |
243 | int prompt_length = 0; | |
c5aa993b | 244 | char *gdb_prompt = get_prompt (); |
b5a0ac70 | 245 | |
adf40b2e JM |
246 | |
247 | if (target_executing && sync_execution) | |
248 | { | |
249 | /* This is to trick readline into not trying to display the | |
250 | prompt. Even though we display the prompt using this | |
251 | function, readline still tries to do its own display if we | |
252 | don't call rl_callback_handler_install and | |
253 | rl_callback_handler_remove (which readline detects because a | |
254 | global variable is not set). If readline did that, it could | |
255 | mess up gdb signal handlers for SIGINT. Readline assumes | |
256 | that between calls to rl_set_signals and rl_clear_signals gdb | |
257 | doesn't do anything with the signal handlers. Well, that's | |
258 | not the case, because when the target executes we change the | |
259 | SIGINT signal handler. If we allowed readline to display the | |
260 | prompt, the signal handler change would happen exactly | |
261 | between the calls to the above two functions. | |
262 | Calling rl_callback_handler_remove(), does the job. */ | |
263 | ||
264 | rl_callback_handler_remove (); | |
265 | return; | |
266 | } | |
267 | ||
b5a0ac70 SS |
268 | if (!new_prompt) |
269 | { | |
270 | /* Just use the top of the prompt stack. */ | |
271 | prompt_length = strlen (PREFIX (0)) + | |
272 | strlen (SUFFIX (0)) + | |
9e0b60a8 | 273 | strlen (gdb_prompt) + 1; |
b5a0ac70 SS |
274 | |
275 | new_prompt = (char *) alloca (prompt_length); | |
276 | ||
277 | /* Prefix needs to have new line at end. */ | |
278 | strcpy (new_prompt, PREFIX (0)); | |
9e0b60a8 | 279 | strcat (new_prompt, gdb_prompt); |
b5a0ac70 SS |
280 | /* Suffix needs to have a new line at end and \032 \032 at |
281 | beginning. */ | |
282 | strcat (new_prompt, SUFFIX (0)); | |
283 | } | |
284 | ||
285 | if (async_command_editing_p) | |
286 | { | |
287 | rl_callback_handler_remove (); | |
288 | rl_callback_handler_install (new_prompt, input_handler); | |
289 | } | |
adf40b2e | 290 | /* new_prompt at this point can be the top of the stack or the one passed in */ |
b5a0ac70 SS |
291 | else if (new_prompt) |
292 | { | |
293 | /* Don't use a _filtered function here. It causes the assumed | |
294 | character position to be off, since the newline we read from | |
295 | the user is not accounted for. */ | |
296 | fputs_unfiltered (new_prompt, gdb_stdout); | |
297 | ||
298 | #ifdef MPW | |
299 | /* Move to a new line so the entered line doesn't have a prompt | |
300 | on the front of it. */ | |
301 | fputs_unfiltered ("\n", gdb_stdout); | |
302 | #endif /* MPW */ | |
303 | gdb_flush (gdb_stdout); | |
304 | } | |
305 | } | |
306 | ||
307 | /* Used when the user requests a different annotation level, with | |
308 | 'set annotate'. It pushes a new prompt (with prefix and suffix) on top | |
309 | of the prompt stack, if the annotation level desired is 2, otherwise | |
310 | it pops the top of the prompt stack when we want the annotation level | |
adf40b2e | 311 | to be the normal ones (1 or 0). */ |
392a587b | 312 | static void |
c2c6d25f | 313 | change_annotation_level (void) |
b5a0ac70 SS |
314 | { |
315 | char *prefix, *suffix; | |
316 | ||
317 | if (!PREFIX (0) || !PROMPT (0) || !SUFFIX (0)) | |
318 | { | |
319 | /* The prompt stack has not been initialized to "", we are | |
320 | using gdb w/o the --async switch */ | |
321 | warning ("Command has same effect as set annotate"); | |
322 | return; | |
323 | } | |
324 | ||
325 | if (annotation_level > 1) | |
326 | { | |
327 | if (!strcmp (PREFIX (0), "") && !strcmp (SUFFIX (0), "")) | |
328 | { | |
329 | /* Push a new prompt if the previous annotation_level was not >1. */ | |
330 | prefix = (char *) alloca (strlen (async_annotation_suffix) + 10); | |
331 | strcpy (prefix, "\n\032\032pre-"); | |
332 | strcat (prefix, async_annotation_suffix); | |
333 | strcat (prefix, "\n"); | |
334 | ||
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"); | |
339 | ||
340 | push_prompt (prefix, (char *) 0, suffix); | |
341 | } | |
342 | } | |
343 | else | |
344 | { | |
345 | if (strcmp (PREFIX (0), "") && strcmp (SUFFIX (0), "")) | |
346 | { | |
347 | /* Pop the top of the stack, we are going back to annotation < 1. */ | |
348 | pop_prompt (); | |
349 | } | |
350 | } | |
351 | } | |
352 | ||
353 | /* Pushes a new prompt on the prompt stack. Each prompt has three | |
354 | parts: prefix, prompt, suffix. Usually prefix and suffix are empty | |
355 | strings, except when the annotation level is 2. Memory is allocated | |
356 | within savestring for the new prompt. */ | |
43ff13b4 | 357 | void |
c2c6d25f | 358 | push_prompt (char *prefix, char *prompt, char *suffix) |
b5a0ac70 SS |
359 | { |
360 | the_prompts.top++; | |
361 | PREFIX (0) = savestring (prefix, strlen (prefix)); | |
362 | ||
43ff13b4 JM |
363 | /* Note that this function is used by the set annotate 2 |
364 | command. This is why we take care of saving the old prompt | |
365 | in case a new one is not specified. */ | |
b5a0ac70 SS |
366 | if (prompt) |
367 | PROMPT (0) = savestring (prompt, strlen (prompt)); | |
368 | else | |
369 | PROMPT (0) = savestring (PROMPT (-1), strlen (PROMPT (-1))); | |
370 | ||
371 | SUFFIX (0) = savestring (suffix, strlen (suffix)); | |
372 | } | |
373 | ||
374 | /* Pops the top of the prompt stack, and frees the memory allocated for it. */ | |
43ff13b4 | 375 | void |
c2c6d25f | 376 | pop_prompt (void) |
b5a0ac70 | 377 | { |
43ff13b4 JM |
378 | /* If we are not during a 'synchronous' execution command, in which |
379 | case, the top prompt would be empty. */ | |
380 | if (strcmp (PROMPT (0), "")) | |
381 | /* This is for the case in which the prompt is set while the | |
382 | annotation level is 2. The top prompt will be changed, but when | |
383 | we return to annotation level < 2, we want that new prompt to be | |
384 | in effect, until the user does another 'set prompt'. */ | |
385 | if (strcmp (PROMPT (0), PROMPT (-1))) | |
386 | { | |
387 | free (PROMPT (-1)); | |
388 | PROMPT (-1) = savestring (PROMPT (0), strlen (PROMPT (0))); | |
389 | } | |
b5a0ac70 SS |
390 | |
391 | free (PREFIX (0)); | |
392 | free (PROMPT (0)); | |
393 | free (SUFFIX (0)); | |
394 | the_prompts.top--; | |
395 | } | |
c2c6d25f JM |
396 | |
397 | /* When there is an event ready on the stdin file desriptor, instead | |
398 | of calling readline directly throught the callback function, or | |
399 | instead of calling gdb_readline2, give gdb a chance to detect | |
400 | errors and do something. */ | |
401 | void | |
402 | stdin_event_handler (int error, int fd, gdb_client_data client_data) | |
403 | { | |
404 | if (error) | |
405 | { | |
406 | printf_unfiltered ("error detected on stdin, fd %d\n", fd); | |
407 | delete_file_handler (fd); | |
408 | discard_all_continuations (); | |
409 | /* If stdin died, we may as well kill gdb. */ | |
410 | exit (1); | |
411 | } | |
412 | else | |
413 | (*call_readline) (client_data); | |
414 | } | |
415 | ||
b5a0ac70 SS |
416 | \f |
417 | /* Handles a gdb command. This function is called by | |
418 | command_line_handler, which has processed one or more input lines | |
419 | into COMMAND. */ | |
392a587b | 420 | /* NOTE: 1999-04-30 This is the asynchronous version of the command_loop |
b5a0ac70 SS |
421 | function. The command_loop function will be obsolete when we |
422 | switch to use the event loop at every execution of gdb. */ | |
392a587b | 423 | static void |
c2c6d25f | 424 | command_handler (char *command) |
b5a0ac70 SS |
425 | { |
426 | struct cleanup *old_chain; | |
427 | int stdin_is_tty = ISATTY (stdin); | |
43ff13b4 JM |
428 | struct continuation_arg *arg1; |
429 | struct continuation_arg *arg2; | |
b5a0ac70 SS |
430 | long time_at_cmd_start; |
431 | #ifdef HAVE_SBRK | |
432 | long space_at_cmd_start = 0; | |
433 | #endif | |
434 | extern int display_time; | |
435 | extern int display_space; | |
436 | ||
437 | #if defined(TUI) | |
438 | extern int insert_mode; | |
439 | #endif | |
440 | ||
441 | quit_flag = 0; | |
442 | if (instream == stdin && stdin_is_tty) | |
443 | reinitialize_more_filter (); | |
444 | old_chain = make_cleanup ((make_cleanup_func) command_loop_marker, 0); | |
445 | ||
446 | #if defined(TUI) | |
447 | insert_mode = 0; | |
448 | #endif | |
449 | /* If readline returned a NULL command, it means that the | |
450 | connection with the terminal is gone. This happens at the | |
451 | end of a testsuite run, after Expect has hung up | |
452 | but GDB is still alive. In such a case, we just quit gdb | |
453 | killing the inferior program too. */ | |
454 | if (command == 0) | |
455 | quit_command ((char *) 0, stdin == instream); | |
456 | ||
457 | time_at_cmd_start = get_run_time (); | |
458 | ||
459 | if (display_space) | |
460 | { | |
461 | #ifdef HAVE_SBRK | |
462 | extern char **environ; | |
463 | char *lim = (char *) sbrk (0); | |
464 | ||
465 | space_at_cmd_start = (long) (lim - (char *) &environ); | |
466 | #endif | |
467 | } | |
468 | ||
469 | execute_command (command, instream == stdin); | |
c5aa993b | 470 | |
43ff13b4 JM |
471 | /* Set things up for this function to be compete later, once the |
472 | executin has completed, if we are doing an execution command, | |
473 | otherwise, just go ahead and finish. */ | |
474 | if (target_has_async && target_executing) | |
475 | { | |
c5aa993b | 476 | arg1 = |
43ff13b4 | 477 | (struct continuation_arg *) xmalloc (sizeof (struct continuation_arg)); |
c5aa993b | 478 | arg2 = |
43ff13b4 JM |
479 | (struct continuation_arg *) xmalloc (sizeof (struct continuation_arg)); |
480 | arg1->next = arg2; | |
481 | arg2->next = NULL; | |
482 | arg1->data = (PTR) time_at_cmd_start; | |
483 | arg2->data = (PTR) space_at_cmd_start; | |
484 | add_continuation (command_line_handler_continuation, arg1); | |
485 | } | |
b5a0ac70 | 486 | |
43ff13b4 JM |
487 | /* Do any commands attached to breakpoint we stopped at. Only if we |
488 | are always running synchronously. Or if we have just executed a | |
489 | command that doesn't start the target. */ | |
490 | if (!target_has_async || !target_executing) | |
491 | { | |
492 | bpstat_do_actions (&stop_bpstat); | |
493 | do_cleanups (old_chain); | |
c5aa993b | 494 | |
43ff13b4 JM |
495 | if (display_time) |
496 | { | |
497 | long cmd_time = get_run_time () - time_at_cmd_start; | |
498 | ||
499 | printf_unfiltered ("Command execution time: %ld.%06ld\n", | |
500 | cmd_time / 1000000, cmd_time % 1000000); | |
501 | } | |
502 | ||
503 | if (display_space) | |
504 | { | |
505 | #ifdef HAVE_SBRK | |
506 | extern char **environ; | |
507 | char *lim = (char *) sbrk (0); | |
508 | long space_now = lim - (char *) &environ; | |
509 | long space_diff = space_now - space_at_cmd_start; | |
510 | ||
511 | printf_unfiltered ("Space used: %ld (%c%ld for this command)\n", | |
512 | space_now, | |
513 | (space_diff >= 0 ? '+' : '-'), | |
514 | space_diff); | |
515 | #endif | |
516 | } | |
517 | } | |
518 | } | |
519 | ||
520 | /* Do any commands attached to breakpoint we stopped at. Only if we | |
521 | are always running synchronously. Or if we have just executed a | |
522 | command that doesn't start the target. */ | |
523 | void | |
c2c6d25f | 524 | command_line_handler_continuation (struct continuation_arg *arg) |
c5aa993b | 525 | { |
43ff13b4 JM |
526 | extern int display_time; |
527 | extern int display_space; | |
528 | ||
529 | long time_at_cmd_start = (long) arg->data; | |
530 | long space_at_cmd_start = (long) arg->next->data; | |
b5a0ac70 | 531 | |
43ff13b4 | 532 | bpstat_do_actions (&stop_bpstat); |
c5aa993b JM |
533 | /*do_cleanups (old_chain); *//*?????FIXME????? */ |
534 | ||
b5a0ac70 SS |
535 | if (display_time) |
536 | { | |
537 | long cmd_time = get_run_time () - time_at_cmd_start; | |
538 | ||
539 | printf_unfiltered ("Command execution time: %ld.%06ld\n", | |
540 | cmd_time / 1000000, cmd_time % 1000000); | |
541 | } | |
b5a0ac70 SS |
542 | if (display_space) |
543 | { | |
544 | #ifdef HAVE_SBRK | |
545 | extern char **environ; | |
546 | char *lim = (char *) sbrk (0); | |
547 | long space_now = lim - (char *) &environ; | |
548 | long space_diff = space_now - space_at_cmd_start; | |
549 | ||
550 | printf_unfiltered ("Space used: %ld (%c%ld for this command)\n", | |
551 | space_now, | |
552 | (space_diff >= 0 ? '+' : '-'), | |
553 | space_diff); | |
554 | #endif | |
555 | } | |
556 | } | |
557 | ||
558 | /* Handle a complete line of input. This is called by the callback | |
559 | mechanism within the readline library. Deal with incomplete commands | |
560 | as well, by saving the partial input in a global buffer. */ | |
561 | ||
392a587b | 562 | /* NOTE: 1999-04-30 This is the asynchronous version of the |
b5a0ac70 SS |
563 | command_line_input function. command_line_input will become |
564 | obsolete once we use the event loop as the default mechanism in | |
565 | GDB. */ | |
566 | static void | |
c2c6d25f | 567 | command_line_handler (char *rl) |
b5a0ac70 SS |
568 | { |
569 | static char *linebuffer = 0; | |
570 | static unsigned linelength = 0; | |
571 | register char *p; | |
572 | char *p1; | |
b5a0ac70 SS |
573 | extern char *line; |
574 | extern int linesize; | |
575 | char *nline; | |
576 | char got_eof = 0; | |
577 | ||
578 | ||
579 | int repeat = (instream == stdin); | |
580 | ||
581 | if (annotation_level > 1 && instream == stdin) | |
582 | { | |
583 | printf_unfiltered ("\n\032\032post-"); | |
584 | printf_unfiltered (async_annotation_suffix); | |
585 | printf_unfiltered ("\n"); | |
586 | } | |
587 | ||
588 | if (linebuffer == 0) | |
589 | { | |
590 | linelength = 80; | |
591 | linebuffer = (char *) xmalloc (linelength); | |
592 | } | |
593 | ||
594 | p = linebuffer; | |
595 | ||
596 | if (more_to_come) | |
597 | { | |
598 | strcpy (linebuffer, readline_input_state.linebuffer); | |
599 | p = readline_input_state.linebuffer_ptr; | |
600 | free (readline_input_state.linebuffer); | |
601 | more_to_come = 0; | |
adf40b2e | 602 | pop_prompt (); |
b5a0ac70 SS |
603 | } |
604 | ||
605 | #ifdef STOP_SIGNAL | |
606 | if (job_control) | |
0f71a2f6 | 607 | signal (STOP_SIGNAL, handle_stop_sig); |
b5a0ac70 SS |
608 | #endif |
609 | ||
610 | /* Make sure that all output has been output. Some machines may let | |
611 | you get away with leaving out some of the gdb_flush, but not all. */ | |
612 | wrap_here (""); | |
613 | gdb_flush (gdb_stdout); | |
614 | gdb_flush (gdb_stderr); | |
615 | ||
616 | if (source_file_name != NULL) | |
617 | { | |
618 | ++source_line_number; | |
619 | sprintf (source_error, | |
620 | "%s%s:%d: Error in sourced command file:\n", | |
621 | source_pre_error, | |
622 | source_file_name, | |
623 | source_line_number); | |
624 | error_pre_print = source_error; | |
625 | } | |
626 | ||
627 | /* If we are in this case, then command_handler will call quit | |
628 | and exit from gdb. */ | |
629 | if (!rl || rl == (char *) EOF) | |
630 | { | |
631 | got_eof = 1; | |
632 | command_handler (0); | |
633 | } | |
634 | if (strlen (rl) + 1 + (p - linebuffer) > linelength) | |
635 | { | |
636 | linelength = strlen (rl) + 1 + (p - linebuffer); | |
637 | nline = (char *) xrealloc (linebuffer, linelength); | |
638 | p += nline - linebuffer; | |
639 | linebuffer = nline; | |
640 | } | |
641 | p1 = rl; | |
642 | /* Copy line. Don't copy null at end. (Leaves line alone | |
643 | if this was just a newline) */ | |
644 | while (*p1) | |
645 | *p++ = *p1++; | |
646 | ||
647 | free (rl); /* Allocated in readline. */ | |
648 | ||
a0b3c4fd | 649 | if (*(p - 1) == '\\') |
b5a0ac70 | 650 | { |
b5a0ac70 SS |
651 | p--; /* Put on top of '\'. */ |
652 | ||
653 | if (*p == '\\') | |
654 | { | |
655 | readline_input_state.linebuffer = savestring (linebuffer, | |
656 | strlen (linebuffer)); | |
657 | readline_input_state.linebuffer_ptr = p; | |
658 | ||
659 | /* We will not invoke a execute_command if there is more | |
660 | input expected to complete the command. So, we need to | |
661 | print an empty prompt here. */ | |
b5a0ac70 | 662 | more_to_come = 1; |
adf40b2e JM |
663 | push_prompt ("", "", ""); |
664 | display_gdb_prompt (0); | |
665 | return; | |
b5a0ac70 SS |
666 | } |
667 | } | |
668 | ||
669 | #ifdef STOP_SIGNAL | |
670 | if (job_control) | |
671 | signal (STOP_SIGNAL, SIG_DFL); | |
672 | #endif | |
673 | ||
674 | #define SERVER_COMMAND_LENGTH 7 | |
675 | server_command = | |
676 | (p - linebuffer > SERVER_COMMAND_LENGTH) | |
677 | && STREQN (linebuffer, "server ", SERVER_COMMAND_LENGTH); | |
678 | if (server_command) | |
679 | { | |
680 | /* Note that we don't set `line'. Between this and the check in | |
681 | dont_repeat, this insures that repeating will still do the | |
682 | right thing. */ | |
683 | *p = '\0'; | |
684 | command_handler (linebuffer + SERVER_COMMAND_LENGTH); | |
685 | display_gdb_prompt (0); | |
686 | return; | |
687 | } | |
688 | ||
689 | /* Do history expansion if that is wished. */ | |
690 | if (history_expansion_p && instream == stdin | |
691 | && ISATTY (instream)) | |
692 | { | |
693 | char *history_value; | |
694 | int expanded; | |
695 | ||
696 | *p = '\0'; /* Insert null now. */ | |
697 | expanded = history_expand (linebuffer, &history_value); | |
698 | if (expanded) | |
699 | { | |
700 | /* Print the changes. */ | |
701 | printf_unfiltered ("%s\n", history_value); | |
702 | ||
703 | /* If there was an error, call this function again. */ | |
704 | if (expanded < 0) | |
705 | { | |
706 | free (history_value); | |
707 | return; | |
708 | } | |
709 | if (strlen (history_value) > linelength) | |
710 | { | |
711 | linelength = strlen (history_value) + 1; | |
712 | linebuffer = (char *) xrealloc (linebuffer, linelength); | |
713 | } | |
714 | strcpy (linebuffer, history_value); | |
715 | p = linebuffer + strlen (linebuffer); | |
716 | free (history_value); | |
717 | } | |
718 | } | |
719 | ||
720 | /* If we just got an empty line, and that is supposed | |
721 | to repeat the previous command, return the value in the | |
722 | global buffer. */ | |
723 | if (repeat && p == linebuffer && *p != '\\') | |
724 | { | |
725 | command_handler (line); | |
726 | display_gdb_prompt (0); | |
727 | return; | |
728 | } | |
729 | ||
730 | for (p1 = linebuffer; *p1 == ' ' || *p1 == '\t'; p1++); | |
731 | if (repeat && !*p1) | |
732 | { | |
733 | command_handler (line); | |
734 | display_gdb_prompt (0); | |
735 | return; | |
736 | } | |
737 | ||
738 | *p = 0; | |
739 | ||
740 | /* Add line to history if appropriate. */ | |
741 | if (instream == stdin | |
742 | && ISATTY (stdin) && *linebuffer) | |
743 | add_history (linebuffer); | |
744 | ||
745 | /* Note: lines consisting solely of comments are added to the command | |
746 | history. This is useful when you type a command, and then | |
747 | realize you don't want to execute it quite yet. You can comment | |
748 | out the command and then later fetch it from the value history | |
749 | and remove the '#'. The kill ring is probably better, but some | |
750 | people are in the habit of commenting things out. */ | |
751 | if (*p1 == '#') | |
752 | *p1 = '\0'; /* Found a comment. */ | |
753 | ||
754 | /* Save into global buffer if appropriate. */ | |
755 | if (repeat) | |
756 | { | |
757 | if (linelength > linesize) | |
758 | { | |
759 | line = xrealloc (line, linelength); | |
760 | linesize = linelength; | |
761 | } | |
762 | strcpy (line, linebuffer); | |
763 | if (!more_to_come) | |
764 | { | |
765 | command_handler (line); | |
766 | display_gdb_prompt (0); | |
767 | } | |
768 | return; | |
769 | } | |
770 | ||
771 | command_handler (linebuffer); | |
772 | display_gdb_prompt (0); | |
773 | return; | |
774 | } | |
775 | ||
776 | /* Does reading of input from terminal w/o the editing features | |
777 | provided by the readline library. */ | |
778 | ||
392a587b | 779 | /* NOTE: 1999-04-30 Asynchronous version of gdb_readline. gdb_readline |
b5a0ac70 SS |
780 | will become obsolete when the event loop is made the default |
781 | execution for gdb. */ | |
085dd6e6 | 782 | void |
c2c6d25f | 783 | gdb_readline2 (gdb_client_data client_data) |
b5a0ac70 SS |
784 | { |
785 | int c; | |
786 | char *result; | |
787 | int input_index = 0; | |
788 | int result_size = 80; | |
7be570e7 JM |
789 | static int done_once = 0; |
790 | ||
791 | /* Unbuffer the input stream, so that, later on, the calls to fgetc | |
792 | fetch only one char at the time from the stream. The fgetc's will | |
793 | get up to the first newline, but there may be more chars in the | |
794 | stream after '\n'. If we buffer the input and fgetc drains the | |
795 | stream, getting stuff beyond the newline as well, a select, done | |
796 | afterwards will not trigger. */ | |
797 | if (!done_once && !ISATTY (instream)) | |
798 | { | |
799 | setbuf (instream, NULL); | |
800 | done_once = 1; | |
801 | } | |
b5a0ac70 SS |
802 | |
803 | result = (char *) xmalloc (result_size); | |
804 | ||
805 | /* We still need the while loop here, even though it would seem | |
806 | obvious to invoke gdb_readline2 at every character entered. If | |
807 | not using the readline library, the terminal is in cooked mode, | |
808 | which sends the characters all at once. Poll will notice that the | |
809 | input fd has changed state only after enter is pressed. At this | |
810 | point we still need to fetch all the chars entered. */ | |
811 | ||
812 | while (1) | |
813 | { | |
814 | /* Read from stdin if we are executing a user defined command. | |
815 | This is the right thing for prompt_for_continue, at least. */ | |
816 | c = fgetc (instream ? instream : stdin); | |
817 | ||
818 | if (c == EOF) | |
819 | { | |
820 | if (input_index > 0) | |
821 | /* The last line does not end with a newline. Return it, and | |
822 | if we are called again fgetc will still return EOF and | |
823 | we'll return NULL then. */ | |
824 | break; | |
825 | free (result); | |
0f71a2f6 | 826 | (*input_handler) (0); |
b5a0ac70 SS |
827 | } |
828 | ||
829 | if (c == '\n') | |
830 | #ifndef CRLF_SOURCE_FILES | |
831 | break; | |
832 | #else | |
833 | { | |
834 | if (input_index > 0 && result[input_index - 1] == '\r') | |
835 | input_index--; | |
836 | break; | |
837 | } | |
838 | #endif | |
839 | ||
840 | result[input_index++] = c; | |
841 | while (input_index >= result_size) | |
842 | { | |
843 | result_size *= 2; | |
844 | result = (char *) xrealloc (result, result_size); | |
845 | } | |
846 | } | |
847 | ||
848 | result[input_index++] = '\0'; | |
0f71a2f6 | 849 | (*input_handler) (result); |
b5a0ac70 SS |
850 | } |
851 | \f | |
852 | ||
853 | /* Initialization of signal handlers and tokens. There is a function | |
854 | handle_sig* for each of the signals GDB cares about. Specifically: | |
855 | SIGINT, SIGFPE, SIGQUIT, SIGTSTP, SIGHUP, SIGWINCH. These | |
856 | functions are the actual signal handlers associated to the signals | |
857 | via calls to signal(). The only job for these functions is to | |
858 | enqueue the appropriate event/procedure with the event loop. Such | |
859 | procedures are the old signal handlers. The event loop will take | |
860 | care of invoking the queued procedures to perform the usual tasks | |
861 | associated with the reception of the signal. */ | |
392a587b | 862 | /* NOTE: 1999-04-30 This is the asynchronous version of init_signals. |
b5a0ac70 SS |
863 | init_signals will become obsolete as we move to have to event loop |
864 | as the default for gdb. */ | |
865 | void | |
c2c6d25f | 866 | async_init_signals (void) |
c5aa993b | 867 | { |
b5a0ac70 SS |
868 | signal (SIGINT, handle_sigint); |
869 | sigint_token = | |
0f71a2f6 | 870 | create_async_signal_handler (async_request_quit, NULL); |
b5a0ac70 SS |
871 | |
872 | /* If SIGTRAP was set to SIG_IGN, then the SIG_IGN will get passed | |
873 | to the inferior and breakpoints will be ignored. */ | |
874 | #ifdef SIGTRAP | |
875 | signal (SIGTRAP, SIG_DFL); | |
876 | #endif | |
877 | ||
878 | /* If we initialize SIGQUIT to SIG_IGN, then the SIG_IGN will get | |
879 | passed to the inferior, which we don't want. It would be | |
880 | possible to do a "signal (SIGQUIT, SIG_DFL)" after we fork, but | |
881 | on BSD4.3 systems using vfork, that can affect the | |
882 | GDB process as well as the inferior (the signal handling tables | |
883 | might be in memory, shared between the two). Since we establish | |
884 | a handler for SIGQUIT, when we call exec it will set the signal | |
885 | to SIG_DFL for us. */ | |
886 | signal (SIGQUIT, handle_sigquit); | |
887 | sigquit_token = | |
0f71a2f6 | 888 | create_async_signal_handler (async_do_nothing, NULL); |
b5a0ac70 SS |
889 | #ifdef SIGHUP |
890 | if (signal (SIGHUP, handle_sighup) != SIG_IGN) | |
891 | sighup_token = | |
0f71a2f6 | 892 | create_async_signal_handler (async_disconnect, NULL); |
b5a0ac70 SS |
893 | else |
894 | sighup_token = | |
0f71a2f6 | 895 | create_async_signal_handler (async_do_nothing, NULL); |
b5a0ac70 SS |
896 | #endif |
897 | signal (SIGFPE, handle_sigfpe); | |
898 | sigfpe_token = | |
0f71a2f6 | 899 | create_async_signal_handler (async_float_handler, NULL); |
b5a0ac70 SS |
900 | |
901 | #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER) | |
902 | signal (SIGWINCH, handle_sigwinch); | |
903 | sigwinch_token = | |
0f71a2f6 | 904 | create_async_signal_handler (SIGWINCH_HANDLER, NULL); |
b5a0ac70 | 905 | #endif |
0f71a2f6 JM |
906 | #ifdef STOP_SIGNAL |
907 | sigtstp_token = | |
908 | create_async_signal_handler (async_stop_sig, NULL); | |
909 | #endif | |
910 | ||
911 | } | |
912 | ||
c5aa993b | 913 | void |
c2c6d25f | 914 | mark_async_signal_handler_wrapper (PTR token) |
0f71a2f6 | 915 | { |
c2c6d25f | 916 | mark_async_signal_handler ((struct async_signal_handler *) token); |
b5a0ac70 SS |
917 | } |
918 | ||
919 | /* Tell the event loop what to do if SIGINT is received. | |
920 | See event-signal.c. */ | |
c5aa993b | 921 | void |
c2c6d25f | 922 | handle_sigint (int sig) |
b5a0ac70 SS |
923 | { |
924 | signal (sig, handle_sigint); | |
925 | ||
926 | /* If immediate_quit is set, we go ahead and process the SIGINT right | |
927 | away, even if we usually would defer this to the event loop. The | |
928 | assumption here is that it is safe to process ^C immediately if | |
929 | immediate_quit is set. If we didn't, SIGINT would be really | |
930 | processed only the next time through the event loop. To get to | |
931 | that point, though, the command that we want to interrupt needs to | |
932 | finish first, which is unacceptable. */ | |
933 | if (immediate_quit) | |
0f71a2f6 | 934 | async_request_quit (0); |
b5a0ac70 SS |
935 | else |
936 | /* If immediate quit is not set, we process SIGINT the next time | |
937 | through the loop, which is fine. */ | |
0f71a2f6 | 938 | mark_async_signal_handler_wrapper (sigint_token); |
b5a0ac70 SS |
939 | } |
940 | ||
941 | /* Do the quit. All the checks have been done by the caller. */ | |
c5aa993b | 942 | void |
c2c6d25f | 943 | async_request_quit (gdb_client_data arg) |
b5a0ac70 SS |
944 | { |
945 | quit_flag = 1; | |
946 | #ifdef REQUEST_QUIT | |
947 | REQUEST_QUIT; | |
948 | #else | |
949 | quit (); | |
950 | #endif | |
951 | } | |
952 | ||
953 | /* Tell the event loop what to do if SIGQUIT is received. | |
954 | See event-signal.c. */ | |
c5aa993b | 955 | static void |
c2c6d25f | 956 | handle_sigquit (int sig) |
b5a0ac70 | 957 | { |
0f71a2f6 | 958 | mark_async_signal_handler_wrapper (sigquit_token); |
b5a0ac70 SS |
959 | signal (sig, handle_sigquit); |
960 | } | |
961 | ||
962 | /* Called by the event loop in response to a SIGQUIT. */ | |
c5aa993b | 963 | static void |
c2c6d25f | 964 | async_do_nothing (gdb_client_data arg) |
b5a0ac70 SS |
965 | { |
966 | /* Empty function body. */ | |
967 | } | |
968 | ||
969 | #ifdef SIGHUP | |
970 | /* Tell the event loop what to do if SIGHUP is received. | |
971 | See event-signal.c. */ | |
c5aa993b | 972 | static void |
b5a0ac70 SS |
973 | handle_sighup (sig) |
974 | int sig; | |
975 | { | |
0f71a2f6 | 976 | mark_async_signal_handler_wrapper (sighup_token); |
b5a0ac70 SS |
977 | signal (sig, handle_sighup); |
978 | } | |
979 | ||
0f71a2f6 | 980 | /* Called by the event loop to process a SIGHUP */ |
c5aa993b | 981 | static void |
c2c6d25f | 982 | async_disconnect (gdb_client_data arg) |
b5a0ac70 SS |
983 | { |
984 | catch_errors (quit_cover, NULL, | |
985 | "Could not kill the program being debugged", | |
986 | RETURN_MASK_ALL); | |
987 | signal (SIGHUP, SIG_DFL); /*FIXME: ??????????? */ | |
988 | kill (getpid (), SIGHUP); | |
989 | } | |
990 | #endif | |
991 | ||
0f71a2f6 | 992 | #ifdef STOP_SIGNAL |
c5aa993b | 993 | void |
c2c6d25f | 994 | handle_stop_sig (int sig) |
0f71a2f6 | 995 | { |
c5aa993b JM |
996 | mark_async_signal_handler_wrapper (sigtstp_token); |
997 | signal (sig, handle_stop_sig); | |
0f71a2f6 JM |
998 | } |
999 | ||
1000 | static void | |
c2c6d25f | 1001 | async_stop_sig (gdb_client_data arg) |
0f71a2f6 | 1002 | { |
c5aa993b | 1003 | char *prompt = get_prompt (); |
0f71a2f6 JM |
1004 | #if STOP_SIGNAL == SIGTSTP |
1005 | signal (SIGTSTP, SIG_DFL); | |
1006 | sigsetmask (0); | |
1007 | kill (getpid (), SIGTSTP); | |
1008 | signal (SIGTSTP, handle_stop_sig); | |
1009 | #else | |
1010 | signal (STOP_SIGNAL, handle_stop_sig); | |
1011 | #endif | |
1012 | printf_unfiltered ("%s", prompt); | |
1013 | gdb_flush (gdb_stdout); | |
1014 | ||
1015 | /* Forget about any previous command -- null line now will do nothing. */ | |
1016 | dont_repeat (); | |
1017 | } | |
1018 | #endif /* STOP_SIGNAL */ | |
1019 | ||
b5a0ac70 SS |
1020 | /* Tell the event loop what to do if SIGFPE is received. |
1021 | See event-signal.c. */ | |
c5aa993b | 1022 | static void |
c2c6d25f | 1023 | handle_sigfpe (int sig) |
b5a0ac70 | 1024 | { |
0f71a2f6 | 1025 | mark_async_signal_handler_wrapper (sigfpe_token); |
b5a0ac70 SS |
1026 | signal (sig, handle_sigfpe); |
1027 | } | |
1028 | ||
1029 | /* Event loop will call this functin to process a SIGFPE. */ | |
c5aa993b | 1030 | static void |
c2c6d25f | 1031 | async_float_handler (gdb_client_data arg) |
b5a0ac70 SS |
1032 | { |
1033 | /* This message is based on ANSI C, section 4.7. Note that integer | |
1034 | divide by zero causes this, so "float" is a misnomer. */ | |
1035 | error ("Erroneous arithmetic operation."); | |
1036 | } | |
1037 | ||
1038 | /* Tell the event loop what to do if SIGWINCH is received. | |
1039 | See event-signal.c. */ | |
1040 | #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER) | |
c5aa993b | 1041 | static void |
c2c6d25f | 1042 | handle_sigwinch (int sig) |
b5a0ac70 | 1043 | { |
0f71a2f6 | 1044 | mark_async_signal_handler_wrapper (sigwinch_token); |
b5a0ac70 SS |
1045 | signal (sig, handle_sigwinch); |
1046 | } | |
1047 | #endif | |
1048 | \f | |
1049 | ||
1050 | /* Called by do_setshow_command. */ | |
1051 | /* ARGSUSED */ | |
1052 | void | |
c2c6d25f | 1053 | set_async_editing_command (char *args, int from_tty, struct cmd_list_element *c) |
b5a0ac70 SS |
1054 | { |
1055 | change_line_handler (); | |
1056 | } | |
1057 | ||
1058 | /* Called by do_setshow_command. */ | |
1059 | /* ARGSUSED */ | |
1060 | void | |
c2c6d25f | 1061 | set_async_annotation_level (char *args, int from_tty, struct cmd_list_element *c) |
b5a0ac70 SS |
1062 | { |
1063 | change_annotation_level (); | |
1064 | } | |
1065 | ||
1066 | /* Called by do_setshow_command. */ | |
1067 | /* ARGSUSED */ | |
1068 | void | |
c2c6d25f | 1069 | set_async_prompt (char *args, int from_tty, struct cmd_list_element *c) |
b5a0ac70 SS |
1070 | { |
1071 | PROMPT (0) = savestring (new_async_prompt, strlen (new_async_prompt)); | |
1072 | } | |
1073 | ||
0f71a2f6 JM |
1074 | /* Set things up for readline to be invoked via the alternate |
1075 | interface, i.e. via a callback function (rl_callback_read_char), | |
c5aa993b | 1076 | and hook up instream to the event loop. */ |
0f71a2f6 | 1077 | void |
c2c6d25f | 1078 | _initialize_event_loop (void) |
0f71a2f6 | 1079 | { |
9e0b60a8 JM |
1080 | if (async_p) |
1081 | { | |
1082 | /* When a character is detected on instream by select or poll, | |
c5aa993b | 1083 | readline will be invoked via this callback function. */ |
c2c6d25f | 1084 | call_readline = rl_callback_read_char_wrapper; |
9e0b60a8 JM |
1085 | |
1086 | /* When readline has read an end-of-line character, it passes | |
c5aa993b JM |
1087 | the complete line to gdb for processing. command_line_handler |
1088 | is the function that does this. */ | |
9e0b60a8 JM |
1089 | input_handler = command_line_handler; |
1090 | ||
1091 | /* Tell readline to use the same input stream that gdb uses. */ | |
1092 | rl_instream = instream; | |
1093 | ||
1094 | /* Get a file descriptor for the input stream, so that we can | |
085dd6e6 | 1095 | register it with the event loop. */ |
9e0b60a8 JM |
1096 | input_fd = fileno (instream); |
1097 | ||
085dd6e6 JM |
1098 | /* Tell gdb to use the cli_command_loop as the main loop. */ |
1099 | command_loop_hook = cli_command_loop; | |
1100 | ||
9e0b60a8 JM |
1101 | /* Now we need to create the event sources for the input file |
1102 | descriptor. */ | |
1103 | /* At this point in time, this is the only event source that we | |
c5aa993b JM |
1104 | register with the even loop. Another source is going to be |
1105 | the target program (inferior), but that must be registered | |
1106 | only when it actually exists (I.e. after we say 'run' or | |
1107 | after we connect to a remote target. */ | |
c2c6d25f | 1108 | add_file_handler (input_fd, stdin_event_handler, 0); |
c5aa993b | 1109 | |
085dd6e6 | 1110 | /* Tell gdb that we will be using the readline library. This |
c5aa993b JM |
1111 | could be overwritten by a command in .gdbinit like 'set |
1112 | editing on' or 'off'. */ | |
085dd6e6 | 1113 | async_command_editing_p = 1; |
9e0b60a8 | 1114 | } |
0f71a2f6 | 1115 | } |