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