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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 *)); | |
43ff13b4 | 38 | static void command_line_handler_continuation PARAMS ((struct continuation_arg *)); |
085dd6e6 | 39 | void gdb_readline2 PARAMS ((void)); |
43ff13b4 JM |
40 | void pop_prompt PARAMS ((void)); |
41 | void push_prompt PARAMS ((char *, char *, char *)); | |
392a587b JM |
42 | static void change_line_handler PARAMS ((void)); |
43 | static void change_annotation_level PARAMS ((void)); | |
44 | static void command_handler PARAMS ((char *)); | |
b5a0ac70 SS |
45 | |
46 | /* Signal handlers. */ | |
43ff13b4 | 47 | void handle_sigint PARAMS ((int)); |
0f71a2f6 JM |
48 | static void handle_sigquit PARAMS ((int)); |
49 | static void handle_sighup PARAMS ((int)); | |
50 | static void handle_sigfpe PARAMS ((int)); | |
51 | static void handle_sigwinch PARAMS ((int)); | |
52 | /* Signal to catch ^Z typed while reading a command: SIGTSTP or SIGCONT. */ | |
53 | #ifndef STOP_SIGNAL | |
54 | #ifdef SIGTSTP | |
55 | #define STOP_SIGNAL SIGTSTP | |
56 | void handle_stop_sig PARAMS ((int)); | |
57 | #endif | |
58 | #endif | |
b5a0ac70 SS |
59 | |
60 | /* Functions to be invoked by the event loop in response to | |
61 | signals. */ | |
0f71a2f6 JM |
62 | void async_request_quit PARAMS ((gdb_client_data)); |
63 | static void async_do_nothing PARAMS ((gdb_client_data)); | |
64 | static void async_disconnect PARAMS ((gdb_client_data)); | |
65 | static void async_float_handler PARAMS ((gdb_client_data)); | |
66 | static void async_stop_sig PARAMS ((gdb_client_data)); | |
b5a0ac70 SS |
67 | |
68 | /* If this definition isn't overridden by the header files, assume | |
69 | that isatty and fileno exist on this system. */ | |
70 | #ifndef ISATTY | |
71 | #define ISATTY(FP) (isatty (fileno (FP))) | |
72 | #endif | |
73 | ||
b5a0ac70 SS |
74 | /* Readline offers an alternate interface, via callback |
75 | functions. These are all included in the file callback.c in the | |
76 | readline distribution. This file provides (mainly) a function, which | |
77 | the event loop uses as callback (i.e. event handler) whenever an event | |
78 | is detected on the standard input file descriptor. | |
79 | readline_callback_read_char is called (by the GDB event loop) whenever | |
80 | there is a new character ready on the input stream. This function | |
81 | incrementally builds a buffer internal to readline where it | |
82 | accumulates the line read up to the point of invocation. In the | |
83 | special case in which the character read is newline, the function | |
84 | invokes a GDB supplied callback routine, which does the processing of | |
85 | a full command line. This latter routine is the asynchronous analog | |
86 | of the old command_line_input in gdb. Instead of invoking (and waiting | |
87 | for) readline to read the command line and pass it back to | |
88 | command_loop for processing, the new command_line_handler function has | |
89 | the command line already available as its parameter. INPUT_HANDLER is | |
90 | to be set to the function that readline will invoke when a complete | |
91 | line of input is ready. CALL_READLINE is to be set to the function | |
92 | that readline offers as callback to the event_loop. */ | |
93 | ||
94 | void (*input_handler) PARAMS ((char *)); | |
95 | void (*call_readline) PARAMS ((void)); | |
96 | ||
97 | /* Important variables for the event loop. */ | |
98 | ||
99 | /* This is used to determine if GDB is using the readline library or | |
100 | its own simplified form of readline. It is used by the asynchronous | |
0f71a2f6 | 101 | form of the set editing command. |
392a587b | 102 | ezannoni: as of 1999-04-29 I expect that this |
b5a0ac70 SS |
103 | variable will not be used after gdb is changed to use the event |
104 | loop as default engine, and event-top.c is merged into top.c. */ | |
105 | int async_command_editing_p; | |
106 | ||
107 | /* This variable contains the new prompt that the user sets with the | |
108 | set prompt command. */ | |
109 | char *new_async_prompt; | |
110 | ||
111 | /* This is the annotation suffix that will be used when the | |
112 | annotation_level is 2. */ | |
113 | char *async_annotation_suffix; | |
114 | ||
115 | /* This is the file descriptor for the input stream that GDB uses to | |
116 | read commands from. */ | |
117 | int input_fd; | |
118 | ||
119 | /* This is the prompt stack. Prompts will be pushed on the stack as | |
120 | needed by the different 'kinds' of user inputs GDB is asking | |
121 | for. See event-loop.h. */ | |
122 | struct prompts the_prompts; | |
123 | ||
124 | /* signal handling variables */ | |
125 | /* Each of these is a pointer to a function that the event loop will | |
126 | invoke if the corresponding signal has received. The real signal | |
127 | handlers mark these functions as ready to be executed and the event | |
128 | loop, in a later iteration, calls them. See the function | |
129 | invoke_async_signal_handler. */ | |
0f71a2f6 | 130 | PTR sigint_token; |
b5a0ac70 | 131 | #ifdef SIGHUP |
0f71a2f6 | 132 | PTR sighup_token; |
b5a0ac70 | 133 | #endif |
0f71a2f6 JM |
134 | PTR sigquit_token; |
135 | PTR sigfpe_token; | |
b5a0ac70 | 136 | #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER) |
0f71a2f6 | 137 | PTR sigwinch_token; |
b5a0ac70 | 138 | #endif |
0f71a2f6 JM |
139 | #ifdef STOP_SIGNAL |
140 | PTR sigtstp_token; | |
141 | #endif | |
142 | ||
143 | void mark_async_signal_handler_wrapper PARAMS ((void *)); | |
b5a0ac70 SS |
144 | |
145 | /* Structure to save a partially entered command. This is used when | |
146 | the user types '\' at the end of a command line. This is necessary | |
147 | because each line of input is handled by a different call to | |
148 | command_line_handler, and normally there is no state retained | |
149 | between different calls. */ | |
150 | int more_to_come = 0; | |
151 | ||
152 | struct readline_input_state | |
153 | { | |
154 | char *linebuffer; | |
155 | char *linebuffer_ptr; | |
156 | } | |
157 | readline_input_state; | |
158 | \f | |
159 | ||
160 | /* Initialize all the necessary variables, start the event loop, | |
085dd6e6 | 161 | register readline, and stdin, start the loop. */ |
b5a0ac70 | 162 | void |
085dd6e6 | 163 | cli_command_loop () |
b5a0ac70 | 164 | { |
0f71a2f6 JM |
165 | int length; |
166 | char *a_prompt; | |
9e0b60a8 | 167 | char *gdb_prompt = get_prompt (); |
b5a0ac70 | 168 | |
0f71a2f6 JM |
169 | /* If we are using readline, set things up and display the first |
170 | prompt, otherwise just print the prompt. */ | |
171 | if (async_command_editing_p) | |
172 | { | |
173 | /* Tell readline what the prompt to display is and what function it | |
174 | will need to call after a whole line is read. This also displays | |
175 | the first prompt.*/ | |
9e0b60a8 | 176 | length = strlen (PREFIX (0)) + strlen (gdb_prompt) + strlen (SUFFIX (0)) + 1; |
0f71a2f6 JM |
177 | a_prompt = (char *) xmalloc (length); |
178 | strcpy (a_prompt, PREFIX (0)); | |
9e0b60a8 | 179 | strcat (a_prompt, gdb_prompt); |
0f71a2f6 JM |
180 | strcat (a_prompt, SUFFIX (0)); |
181 | rl_callback_handler_install (a_prompt, input_handler); | |
182 | } | |
183 | else | |
184 | display_gdb_prompt (0); | |
b5a0ac70 | 185 | |
085dd6e6 JM |
186 | /* Now it's time to start the event loop. */ |
187 | start_event_loop (); | |
b5a0ac70 SS |
188 | } |
189 | ||
190 | /* Change the function to be invoked every time there is a character | |
191 | ready on stdin. This is used when the user sets the editing off, | |
192 | therefore bypassing readline, and letting gdb handle the input | |
193 | itself, via gdb_readline2. Also it is used in the opposite case in | |
194 | which the user sets editing on again, by restoring readline | |
195 | handling of the input. */ | |
392a587b | 196 | static void |
b5a0ac70 SS |
197 | change_line_handler () |
198 | { | |
199 | if (async_command_editing_p) | |
200 | { | |
201 | /* Turn on editing by using readline. */ | |
202 | call_readline = rl_callback_read_char; | |
0f71a2f6 | 203 | input_handler = command_line_handler; |
b5a0ac70 SS |
204 | } |
205 | else | |
206 | { | |
207 | /* Turn off editing by using gdb_readline2. */ | |
208 | rl_callback_handler_remove (); | |
209 | call_readline = gdb_readline2; | |
0f71a2f6 JM |
210 | |
211 | /* Set up the command handler as well, in case we are called as | |
212 | first thing from .gdbinit. */ | |
213 | input_handler = command_line_handler; | |
b5a0ac70 SS |
214 | } |
215 | ||
216 | /* To tell the event loop to change the handler associated with the | |
217 | input file descriptor, we need to create a new event source, | |
218 | corresponding to the same fd, but with a new event handler | |
219 | function. */ | |
085dd6e6 JM |
220 | /* NOTE: this operates on input_fd, not instream. If we are reading |
221 | commands from a file, instream will point to the file. However in | |
222 | async mode, we always read commands from a file with editing | |
223 | off. This means that the 'set editing on/off' will have effect | |
224 | only on the interactive session. */ | |
b5a0ac70 | 225 | delete_file_handler (input_fd); |
085dd6e6 | 226 | add_file_handler (input_fd, (file_handler_func *) call_readline, 0); |
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 | |
241 | display_gdb_prompt (new_prompt) | |
242 | char *new_prompt; | |
243 | { | |
244 | int prompt_length = 0; | |
9e0b60a8 | 245 | char *gdb_prompt = get_prompt (); |
b5a0ac70 SS |
246 | |
247 | if (!new_prompt) | |
248 | { | |
249 | /* Just use the top of the prompt stack. */ | |
250 | prompt_length = strlen (PREFIX (0)) + | |
251 | strlen (SUFFIX (0)) + | |
9e0b60a8 | 252 | strlen (gdb_prompt) + 1; |
b5a0ac70 SS |
253 | |
254 | new_prompt = (char *) alloca (prompt_length); | |
255 | ||
256 | /* Prefix needs to have new line at end. */ | |
257 | strcpy (new_prompt, PREFIX (0)); | |
9e0b60a8 | 258 | strcat (new_prompt, gdb_prompt); |
b5a0ac70 SS |
259 | /* Suffix needs to have a new line at end and \032 \032 at |
260 | beginning. */ | |
261 | strcat (new_prompt, SUFFIX (0)); | |
262 | } | |
263 | ||
264 | if (async_command_editing_p) | |
265 | { | |
266 | rl_callback_handler_remove (); | |
267 | rl_callback_handler_install (new_prompt, input_handler); | |
268 | } | |
269 | else if (new_prompt) | |
270 | { | |
271 | /* Don't use a _filtered function here. It causes the assumed | |
272 | character position to be off, since the newline we read from | |
273 | the user is not accounted for. */ | |
274 | fputs_unfiltered (new_prompt, gdb_stdout); | |
275 | ||
276 | #ifdef MPW | |
277 | /* Move to a new line so the entered line doesn't have a prompt | |
278 | on the front of it. */ | |
279 | fputs_unfiltered ("\n", gdb_stdout); | |
280 | #endif /* MPW */ | |
281 | gdb_flush (gdb_stdout); | |
282 | } | |
283 | } | |
284 | ||
285 | /* Used when the user requests a different annotation level, with | |
286 | 'set annotate'. It pushes a new prompt (with prefix and suffix) on top | |
287 | of the prompt stack, if the annotation level desired is 2, otherwise | |
288 | it pops the top of the prompt stack when we want the annotation level | |
289 | to be the normal ones (1 or 2). */ | |
392a587b | 290 | static void |
b5a0ac70 SS |
291 | change_annotation_level () |
292 | { | |
293 | char *prefix, *suffix; | |
294 | ||
295 | if (!PREFIX (0) || !PROMPT (0) || !SUFFIX (0)) | |
296 | { | |
297 | /* The prompt stack has not been initialized to "", we are | |
298 | using gdb w/o the --async switch */ | |
299 | warning ("Command has same effect as set annotate"); | |
300 | return; | |
301 | } | |
302 | ||
303 | if (annotation_level > 1) | |
304 | { | |
305 | if (!strcmp (PREFIX (0), "") && !strcmp (SUFFIX (0), "")) | |
306 | { | |
307 | /* Push a new prompt if the previous annotation_level was not >1. */ | |
308 | prefix = (char *) alloca (strlen (async_annotation_suffix) + 10); | |
309 | strcpy (prefix, "\n\032\032pre-"); | |
310 | strcat (prefix, async_annotation_suffix); | |
311 | strcat (prefix, "\n"); | |
312 | ||
313 | suffix = (char *) alloca (strlen (async_annotation_suffix) + 6); | |
314 | strcpy (suffix, "\n\032\032"); | |
315 | strcat (suffix, async_annotation_suffix); | |
316 | strcat (suffix, "\n"); | |
317 | ||
318 | push_prompt (prefix, (char *) 0, suffix); | |
319 | } | |
320 | } | |
321 | else | |
322 | { | |
323 | if (strcmp (PREFIX (0), "") && strcmp (SUFFIX (0), "")) | |
324 | { | |
325 | /* Pop the top of the stack, we are going back to annotation < 1. */ | |
326 | pop_prompt (); | |
327 | } | |
328 | } | |
329 | } | |
330 | ||
331 | /* Pushes a new prompt on the prompt stack. Each prompt has three | |
332 | parts: prefix, prompt, suffix. Usually prefix and suffix are empty | |
333 | strings, except when the annotation level is 2. Memory is allocated | |
334 | within savestring for the new prompt. */ | |
43ff13b4 | 335 | void |
b5a0ac70 SS |
336 | push_prompt (prefix, prompt, suffix) |
337 | char *prefix; | |
338 | char *prompt; | |
339 | char *suffix; | |
340 | { | |
341 | the_prompts.top++; | |
342 | PREFIX (0) = savestring (prefix, strlen (prefix)); | |
343 | ||
43ff13b4 JM |
344 | /* Note that this function is used by the set annotate 2 |
345 | command. This is why we take care of saving the old prompt | |
346 | in case a new one is not specified. */ | |
b5a0ac70 SS |
347 | if (prompt) |
348 | PROMPT (0) = savestring (prompt, strlen (prompt)); | |
349 | else | |
350 | PROMPT (0) = savestring (PROMPT (-1), strlen (PROMPT (-1))); | |
351 | ||
352 | SUFFIX (0) = savestring (suffix, strlen (suffix)); | |
353 | } | |
354 | ||
355 | /* Pops the top of the prompt stack, and frees the memory allocated for it. */ | |
43ff13b4 | 356 | void |
b5a0ac70 SS |
357 | pop_prompt () |
358 | { | |
43ff13b4 JM |
359 | /* If we are not during a 'synchronous' execution command, in which |
360 | case, the top prompt would be empty. */ | |
361 | if (strcmp (PROMPT (0), "")) | |
362 | /* This is for the case in which the prompt is set while the | |
363 | annotation level is 2. The top prompt will be changed, but when | |
364 | we return to annotation level < 2, we want that new prompt to be | |
365 | in effect, until the user does another 'set prompt'. */ | |
366 | if (strcmp (PROMPT (0), PROMPT (-1))) | |
367 | { | |
368 | free (PROMPT (-1)); | |
369 | PROMPT (-1) = savestring (PROMPT (0), strlen (PROMPT (0))); | |
370 | } | |
b5a0ac70 SS |
371 | |
372 | free (PREFIX (0)); | |
373 | free (PROMPT (0)); | |
374 | free (SUFFIX (0)); | |
375 | the_prompts.top--; | |
376 | } | |
377 | \f | |
378 | /* Handles a gdb command. This function is called by | |
379 | command_line_handler, which has processed one or more input lines | |
380 | into COMMAND. */ | |
392a587b | 381 | /* NOTE: 1999-04-30 This is the asynchronous version of the command_loop |
b5a0ac70 SS |
382 | function. The command_loop function will be obsolete when we |
383 | switch to use the event loop at every execution of gdb. */ | |
392a587b | 384 | static void |
b5a0ac70 SS |
385 | command_handler (command) |
386 | char *command; | |
387 | { | |
388 | struct cleanup *old_chain; | |
389 | int stdin_is_tty = ISATTY (stdin); | |
43ff13b4 JM |
390 | struct continuation_arg *arg1; |
391 | struct continuation_arg *arg2; | |
b5a0ac70 SS |
392 | long time_at_cmd_start; |
393 | #ifdef HAVE_SBRK | |
394 | long space_at_cmd_start = 0; | |
395 | #endif | |
396 | extern int display_time; | |
397 | extern int display_space; | |
398 | ||
399 | #if defined(TUI) | |
400 | extern int insert_mode; | |
401 | #endif | |
402 | ||
403 | quit_flag = 0; | |
404 | if (instream == stdin && stdin_is_tty) | |
405 | reinitialize_more_filter (); | |
406 | old_chain = make_cleanup ((make_cleanup_func) command_loop_marker, 0); | |
407 | ||
408 | #if defined(TUI) | |
409 | insert_mode = 0; | |
410 | #endif | |
411 | /* If readline returned a NULL command, it means that the | |
412 | connection with the terminal is gone. This happens at the | |
413 | end of a testsuite run, after Expect has hung up | |
414 | but GDB is still alive. In such a case, we just quit gdb | |
415 | killing the inferior program too. */ | |
416 | if (command == 0) | |
417 | quit_command ((char *) 0, stdin == instream); | |
418 | ||
419 | time_at_cmd_start = get_run_time (); | |
420 | ||
421 | if (display_space) | |
422 | { | |
423 | #ifdef HAVE_SBRK | |
424 | extern char **environ; | |
425 | char *lim = (char *) sbrk (0); | |
426 | ||
427 | space_at_cmd_start = (long) (lim - (char *) &environ); | |
428 | #endif | |
429 | } | |
430 | ||
431 | execute_command (command, instream == stdin); | |
43ff13b4 JM |
432 | |
433 | /* Set things up for this function to be compete later, once the | |
434 | executin has completed, if we are doing an execution command, | |
435 | otherwise, just go ahead and finish. */ | |
436 | if (target_has_async && target_executing) | |
437 | { | |
438 | arg1 = | |
439 | (struct continuation_arg *) xmalloc (sizeof (struct continuation_arg)); | |
440 | arg2 = | |
441 | (struct continuation_arg *) xmalloc (sizeof (struct continuation_arg)); | |
442 | arg1->next = arg2; | |
443 | arg2->next = NULL; | |
444 | arg1->data = (PTR) time_at_cmd_start; | |
445 | arg2->data = (PTR) space_at_cmd_start; | |
446 | add_continuation (command_line_handler_continuation, arg1); | |
447 | } | |
b5a0ac70 | 448 | |
43ff13b4 JM |
449 | /* Do any commands attached to breakpoint we stopped at. Only if we |
450 | are always running synchronously. Or if we have just executed a | |
451 | command that doesn't start the target. */ | |
452 | if (!target_has_async || !target_executing) | |
453 | { | |
454 | bpstat_do_actions (&stop_bpstat); | |
455 | do_cleanups (old_chain); | |
456 | ||
457 | if (display_time) | |
458 | { | |
459 | long cmd_time = get_run_time () - time_at_cmd_start; | |
460 | ||
461 | printf_unfiltered ("Command execution time: %ld.%06ld\n", | |
462 | cmd_time / 1000000, cmd_time % 1000000); | |
463 | } | |
464 | ||
465 | if (display_space) | |
466 | { | |
467 | #ifdef HAVE_SBRK | |
468 | extern char **environ; | |
469 | char *lim = (char *) sbrk (0); | |
470 | long space_now = lim - (char *) &environ; | |
471 | long space_diff = space_now - space_at_cmd_start; | |
472 | ||
473 | printf_unfiltered ("Space used: %ld (%c%ld for this command)\n", | |
474 | space_now, | |
475 | (space_diff >= 0 ? '+' : '-'), | |
476 | space_diff); | |
477 | #endif | |
478 | } | |
479 | } | |
480 | } | |
481 | ||
482 | /* Do any commands attached to breakpoint we stopped at. Only if we | |
483 | are always running synchronously. Or if we have just executed a | |
484 | command that doesn't start the target. */ | |
485 | void | |
486 | command_line_handler_continuation (arg) | |
487 | struct continuation_arg *arg; | |
488 | { | |
489 | extern int display_time; | |
490 | extern int display_space; | |
491 | ||
492 | long time_at_cmd_start = (long) arg->data; | |
493 | long space_at_cmd_start = (long) arg->next->data; | |
b5a0ac70 | 494 | |
43ff13b4 JM |
495 | bpstat_do_actions (&stop_bpstat); |
496 | /*do_cleanups (old_chain);*/ /*?????FIXME?????*/ | |
497 | ||
b5a0ac70 SS |
498 | if (display_time) |
499 | { | |
500 | long cmd_time = get_run_time () - time_at_cmd_start; | |
501 | ||
502 | printf_unfiltered ("Command execution time: %ld.%06ld\n", | |
503 | cmd_time / 1000000, cmd_time % 1000000); | |
504 | } | |
b5a0ac70 SS |
505 | if (display_space) |
506 | { | |
507 | #ifdef HAVE_SBRK | |
508 | extern char **environ; | |
509 | char *lim = (char *) sbrk (0); | |
510 | long space_now = lim - (char *) &environ; | |
511 | long space_diff = space_now - space_at_cmd_start; | |
512 | ||
513 | printf_unfiltered ("Space used: %ld (%c%ld for this command)\n", | |
514 | space_now, | |
515 | (space_diff >= 0 ? '+' : '-'), | |
516 | space_diff); | |
517 | #endif | |
518 | } | |
519 | } | |
520 | ||
521 | /* Handle a complete line of input. This is called by the callback | |
522 | mechanism within the readline library. Deal with incomplete commands | |
523 | as well, by saving the partial input in a global buffer. */ | |
524 | ||
392a587b | 525 | /* NOTE: 1999-04-30 This is the asynchronous version of the |
b5a0ac70 SS |
526 | command_line_input function. command_line_input will become |
527 | obsolete once we use the event loop as the default mechanism in | |
528 | GDB. */ | |
529 | static void | |
530 | command_line_handler (rl) | |
531 | char *rl; | |
532 | { | |
533 | static char *linebuffer = 0; | |
534 | static unsigned linelength = 0; | |
535 | register char *p; | |
536 | char *p1; | |
537 | int change_prompt = 0; | |
538 | extern char *line; | |
539 | extern int linesize; | |
540 | char *nline; | |
541 | char got_eof = 0; | |
542 | ||
543 | ||
544 | int repeat = (instream == stdin); | |
545 | ||
546 | if (annotation_level > 1 && instream == stdin) | |
547 | { | |
548 | printf_unfiltered ("\n\032\032post-"); | |
549 | printf_unfiltered (async_annotation_suffix); | |
550 | printf_unfiltered ("\n"); | |
551 | } | |
552 | ||
553 | if (linebuffer == 0) | |
554 | { | |
555 | linelength = 80; | |
556 | linebuffer = (char *) xmalloc (linelength); | |
557 | } | |
558 | ||
559 | p = linebuffer; | |
560 | ||
561 | if (more_to_come) | |
562 | { | |
563 | strcpy (linebuffer, readline_input_state.linebuffer); | |
564 | p = readline_input_state.linebuffer_ptr; | |
565 | free (readline_input_state.linebuffer); | |
566 | more_to_come = 0; | |
567 | change_prompt = 1; | |
568 | } | |
569 | ||
570 | #ifdef STOP_SIGNAL | |
571 | if (job_control) | |
0f71a2f6 | 572 | signal (STOP_SIGNAL, handle_stop_sig); |
b5a0ac70 SS |
573 | #endif |
574 | ||
575 | /* Make sure that all output has been output. Some machines may let | |
576 | you get away with leaving out some of the gdb_flush, but not all. */ | |
577 | wrap_here (""); | |
578 | gdb_flush (gdb_stdout); | |
579 | gdb_flush (gdb_stderr); | |
580 | ||
581 | if (source_file_name != NULL) | |
582 | { | |
583 | ++source_line_number; | |
584 | sprintf (source_error, | |
585 | "%s%s:%d: Error in sourced command file:\n", | |
586 | source_pre_error, | |
587 | source_file_name, | |
588 | source_line_number); | |
589 | error_pre_print = source_error; | |
590 | } | |
591 | ||
592 | /* If we are in this case, then command_handler will call quit | |
593 | and exit from gdb. */ | |
594 | if (!rl || rl == (char *) EOF) | |
595 | { | |
596 | got_eof = 1; | |
597 | command_handler (0); | |
598 | } | |
599 | if (strlen (rl) + 1 + (p - linebuffer) > linelength) | |
600 | { | |
601 | linelength = strlen (rl) + 1 + (p - linebuffer); | |
602 | nline = (char *) xrealloc (linebuffer, linelength); | |
603 | p += nline - linebuffer; | |
604 | linebuffer = nline; | |
605 | } | |
606 | p1 = rl; | |
607 | /* Copy line. Don't copy null at end. (Leaves line alone | |
608 | if this was just a newline) */ | |
609 | while (*p1) | |
610 | *p++ = *p1++; | |
611 | ||
612 | free (rl); /* Allocated in readline. */ | |
613 | ||
614 | if (p == linebuffer || *(p - 1) == '\\') | |
615 | { | |
616 | /* We come here also if the line entered is empty (just a 'return') */ | |
617 | p--; /* Put on top of '\'. */ | |
618 | ||
619 | if (*p == '\\') | |
620 | { | |
621 | readline_input_state.linebuffer = savestring (linebuffer, | |
622 | strlen (linebuffer)); | |
623 | readline_input_state.linebuffer_ptr = p; | |
624 | ||
625 | /* We will not invoke a execute_command if there is more | |
626 | input expected to complete the command. So, we need to | |
627 | print an empty prompt here. */ | |
628 | display_gdb_prompt (""); | |
629 | more_to_come = 1; | |
630 | } | |
631 | } | |
632 | ||
633 | #ifdef STOP_SIGNAL | |
634 | if (job_control) | |
635 | signal (STOP_SIGNAL, SIG_DFL); | |
636 | #endif | |
637 | ||
638 | #define SERVER_COMMAND_LENGTH 7 | |
639 | server_command = | |
640 | (p - linebuffer > SERVER_COMMAND_LENGTH) | |
641 | && STREQN (linebuffer, "server ", SERVER_COMMAND_LENGTH); | |
642 | if (server_command) | |
643 | { | |
644 | /* Note that we don't set `line'. Between this and the check in | |
645 | dont_repeat, this insures that repeating will still do the | |
646 | right thing. */ | |
647 | *p = '\0'; | |
648 | command_handler (linebuffer + SERVER_COMMAND_LENGTH); | |
649 | display_gdb_prompt (0); | |
650 | return; | |
651 | } | |
652 | ||
653 | /* Do history expansion if that is wished. */ | |
654 | if (history_expansion_p && instream == stdin | |
655 | && ISATTY (instream)) | |
656 | { | |
657 | char *history_value; | |
658 | int expanded; | |
659 | ||
660 | *p = '\0'; /* Insert null now. */ | |
661 | expanded = history_expand (linebuffer, &history_value); | |
662 | if (expanded) | |
663 | { | |
664 | /* Print the changes. */ | |
665 | printf_unfiltered ("%s\n", history_value); | |
666 | ||
667 | /* If there was an error, call this function again. */ | |
668 | if (expanded < 0) | |
669 | { | |
670 | free (history_value); | |
671 | return; | |
672 | } | |
673 | if (strlen (history_value) > linelength) | |
674 | { | |
675 | linelength = strlen (history_value) + 1; | |
676 | linebuffer = (char *) xrealloc (linebuffer, linelength); | |
677 | } | |
678 | strcpy (linebuffer, history_value); | |
679 | p = linebuffer + strlen (linebuffer); | |
680 | free (history_value); | |
681 | } | |
682 | } | |
683 | ||
684 | /* If we just got an empty line, and that is supposed | |
685 | to repeat the previous command, return the value in the | |
686 | global buffer. */ | |
687 | if (repeat && p == linebuffer && *p != '\\') | |
688 | { | |
689 | command_handler (line); | |
690 | display_gdb_prompt (0); | |
691 | return; | |
692 | } | |
693 | ||
694 | for (p1 = linebuffer; *p1 == ' ' || *p1 == '\t'; p1++); | |
695 | if (repeat && !*p1) | |
696 | { | |
697 | command_handler (line); | |
698 | display_gdb_prompt (0); | |
699 | return; | |
700 | } | |
701 | ||
702 | *p = 0; | |
703 | ||
704 | /* Add line to history if appropriate. */ | |
705 | if (instream == stdin | |
706 | && ISATTY (stdin) && *linebuffer) | |
707 | add_history (linebuffer); | |
708 | ||
709 | /* Note: lines consisting solely of comments are added to the command | |
710 | history. This is useful when you type a command, and then | |
711 | realize you don't want to execute it quite yet. You can comment | |
712 | out the command and then later fetch it from the value history | |
713 | and remove the '#'. The kill ring is probably better, but some | |
714 | people are in the habit of commenting things out. */ | |
715 | if (*p1 == '#') | |
716 | *p1 = '\0'; /* Found a comment. */ | |
717 | ||
718 | /* Save into global buffer if appropriate. */ | |
719 | if (repeat) | |
720 | { | |
721 | if (linelength > linesize) | |
722 | { | |
723 | line = xrealloc (line, linelength); | |
724 | linesize = linelength; | |
725 | } | |
726 | strcpy (line, linebuffer); | |
727 | if (!more_to_come) | |
728 | { | |
729 | command_handler (line); | |
730 | display_gdb_prompt (0); | |
731 | } | |
732 | return; | |
733 | } | |
734 | ||
735 | command_handler (linebuffer); | |
736 | display_gdb_prompt (0); | |
737 | return; | |
738 | } | |
739 | ||
740 | /* Does reading of input from terminal w/o the editing features | |
741 | provided by the readline library. */ | |
742 | ||
392a587b | 743 | /* NOTE: 1999-04-30 Asynchronous version of gdb_readline. gdb_readline |
b5a0ac70 SS |
744 | will become obsolete when the event loop is made the default |
745 | execution for gdb. */ | |
085dd6e6 | 746 | void |
b5a0ac70 SS |
747 | gdb_readline2 () |
748 | { | |
749 | int c; | |
750 | char *result; | |
751 | int input_index = 0; | |
752 | int result_size = 80; | |
753 | ||
754 | result = (char *) xmalloc (result_size); | |
755 | ||
756 | /* We still need the while loop here, even though it would seem | |
757 | obvious to invoke gdb_readline2 at every character entered. If | |
758 | not using the readline library, the terminal is in cooked mode, | |
759 | which sends the characters all at once. Poll will notice that the | |
760 | input fd has changed state only after enter is pressed. At this | |
761 | point we still need to fetch all the chars entered. */ | |
762 | ||
763 | while (1) | |
764 | { | |
765 | /* Read from stdin if we are executing a user defined command. | |
766 | This is the right thing for prompt_for_continue, at least. */ | |
767 | c = fgetc (instream ? instream : stdin); | |
768 | ||
769 | if (c == EOF) | |
770 | { | |
771 | if (input_index > 0) | |
772 | /* The last line does not end with a newline. Return it, and | |
773 | if we are called again fgetc will still return EOF and | |
774 | we'll return NULL then. */ | |
775 | break; | |
776 | free (result); | |
0f71a2f6 | 777 | (*input_handler) (0); |
b5a0ac70 SS |
778 | } |
779 | ||
780 | if (c == '\n') | |
781 | #ifndef CRLF_SOURCE_FILES | |
782 | break; | |
783 | #else | |
784 | { | |
785 | if (input_index > 0 && result[input_index - 1] == '\r') | |
786 | input_index--; | |
787 | break; | |
788 | } | |
789 | #endif | |
790 | ||
791 | result[input_index++] = c; | |
792 | while (input_index >= result_size) | |
793 | { | |
794 | result_size *= 2; | |
795 | result = (char *) xrealloc (result, result_size); | |
796 | } | |
797 | } | |
798 | ||
799 | result[input_index++] = '\0'; | |
0f71a2f6 | 800 | (*input_handler) (result); |
b5a0ac70 SS |
801 | } |
802 | \f | |
803 | ||
804 | /* Initialization of signal handlers and tokens. There is a function | |
805 | handle_sig* for each of the signals GDB cares about. Specifically: | |
806 | SIGINT, SIGFPE, SIGQUIT, SIGTSTP, SIGHUP, SIGWINCH. These | |
807 | functions are the actual signal handlers associated to the signals | |
808 | via calls to signal(). The only job for these functions is to | |
809 | enqueue the appropriate event/procedure with the event loop. Such | |
810 | procedures are the old signal handlers. The event loop will take | |
811 | care of invoking the queued procedures to perform the usual tasks | |
812 | associated with the reception of the signal. */ | |
392a587b | 813 | /* NOTE: 1999-04-30 This is the asynchronous version of init_signals. |
b5a0ac70 SS |
814 | init_signals will become obsolete as we move to have to event loop |
815 | as the default for gdb. */ | |
816 | void | |
817 | async_init_signals () | |
0f71a2f6 | 818 | { |
b5a0ac70 SS |
819 | signal (SIGINT, handle_sigint); |
820 | sigint_token = | |
0f71a2f6 | 821 | create_async_signal_handler (async_request_quit, NULL); |
b5a0ac70 SS |
822 | |
823 | /* If SIGTRAP was set to SIG_IGN, then the SIG_IGN will get passed | |
824 | to the inferior and breakpoints will be ignored. */ | |
825 | #ifdef SIGTRAP | |
826 | signal (SIGTRAP, SIG_DFL); | |
827 | #endif | |
828 | ||
829 | /* If we initialize SIGQUIT to SIG_IGN, then the SIG_IGN will get | |
830 | passed to the inferior, which we don't want. It would be | |
831 | possible to do a "signal (SIGQUIT, SIG_DFL)" after we fork, but | |
832 | on BSD4.3 systems using vfork, that can affect the | |
833 | GDB process as well as the inferior (the signal handling tables | |
834 | might be in memory, shared between the two). Since we establish | |
835 | a handler for SIGQUIT, when we call exec it will set the signal | |
836 | to SIG_DFL for us. */ | |
837 | signal (SIGQUIT, handle_sigquit); | |
838 | sigquit_token = | |
0f71a2f6 | 839 | create_async_signal_handler (async_do_nothing, NULL); |
b5a0ac70 SS |
840 | #ifdef SIGHUP |
841 | if (signal (SIGHUP, handle_sighup) != SIG_IGN) | |
842 | sighup_token = | |
0f71a2f6 | 843 | create_async_signal_handler (async_disconnect, NULL); |
b5a0ac70 SS |
844 | else |
845 | sighup_token = | |
0f71a2f6 | 846 | create_async_signal_handler (async_do_nothing, NULL); |
b5a0ac70 SS |
847 | #endif |
848 | signal (SIGFPE, handle_sigfpe); | |
849 | sigfpe_token = | |
0f71a2f6 | 850 | create_async_signal_handler (async_float_handler, NULL); |
b5a0ac70 SS |
851 | |
852 | #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER) | |
853 | signal (SIGWINCH, handle_sigwinch); | |
854 | sigwinch_token = | |
0f71a2f6 | 855 | create_async_signal_handler (SIGWINCH_HANDLER, NULL); |
b5a0ac70 | 856 | #endif |
0f71a2f6 JM |
857 | #ifdef STOP_SIGNAL |
858 | sigtstp_token = | |
859 | create_async_signal_handler (async_stop_sig, NULL); | |
860 | #endif | |
861 | ||
862 | } | |
863 | ||
864 | void | |
865 | mark_async_signal_handler_wrapper (token) | |
866 | void *token; | |
867 | { | |
868 | mark_async_signal_handler ((async_signal_handler *) token); | |
b5a0ac70 SS |
869 | } |
870 | ||
871 | /* Tell the event loop what to do if SIGINT is received. | |
872 | See event-signal.c. */ | |
43ff13b4 | 873 | void |
b5a0ac70 SS |
874 | handle_sigint (sig) |
875 | int sig; | |
876 | { | |
877 | signal (sig, handle_sigint); | |
878 | ||
879 | /* If immediate_quit is set, we go ahead and process the SIGINT right | |
880 | away, even if we usually would defer this to the event loop. The | |
881 | assumption here is that it is safe to process ^C immediately if | |
882 | immediate_quit is set. If we didn't, SIGINT would be really | |
883 | processed only the next time through the event loop. To get to | |
884 | that point, though, the command that we want to interrupt needs to | |
885 | finish first, which is unacceptable. */ | |
886 | if (immediate_quit) | |
0f71a2f6 | 887 | async_request_quit (0); |
b5a0ac70 SS |
888 | else |
889 | /* If immediate quit is not set, we process SIGINT the next time | |
890 | through the loop, which is fine. */ | |
0f71a2f6 | 891 | mark_async_signal_handler_wrapper (sigint_token); |
b5a0ac70 SS |
892 | } |
893 | ||
894 | /* Do the quit. All the checks have been done by the caller. */ | |
895 | void | |
0f71a2f6 JM |
896 | async_request_quit (arg) |
897 | gdb_client_data arg; | |
b5a0ac70 SS |
898 | { |
899 | quit_flag = 1; | |
900 | #ifdef REQUEST_QUIT | |
901 | REQUEST_QUIT; | |
902 | #else | |
903 | quit (); | |
904 | #endif | |
905 | } | |
906 | ||
907 | /* Tell the event loop what to do if SIGQUIT is received. | |
908 | See event-signal.c. */ | |
0f71a2f6 | 909 | static void |
b5a0ac70 SS |
910 | handle_sigquit (sig) |
911 | int sig; | |
912 | { | |
0f71a2f6 | 913 | mark_async_signal_handler_wrapper (sigquit_token); |
b5a0ac70 SS |
914 | signal (sig, handle_sigquit); |
915 | } | |
916 | ||
917 | /* Called by the event loop in response to a SIGQUIT. */ | |
0f71a2f6 JM |
918 | static void |
919 | async_do_nothing (arg) | |
920 | gdb_client_data arg; | |
b5a0ac70 SS |
921 | { |
922 | /* Empty function body. */ | |
923 | } | |
924 | ||
925 | #ifdef SIGHUP | |
926 | /* Tell the event loop what to do if SIGHUP is received. | |
927 | See event-signal.c. */ | |
0f71a2f6 | 928 | static void |
b5a0ac70 SS |
929 | handle_sighup (sig) |
930 | int sig; | |
931 | { | |
0f71a2f6 | 932 | mark_async_signal_handler_wrapper (sighup_token); |
b5a0ac70 SS |
933 | signal (sig, handle_sighup); |
934 | } | |
935 | ||
0f71a2f6 JM |
936 | /* Called by the event loop to process a SIGHUP */ |
937 | static void | |
938 | async_disconnect (arg) | |
939 | gdb_client_data arg; | |
b5a0ac70 SS |
940 | { |
941 | catch_errors (quit_cover, NULL, | |
942 | "Could not kill the program being debugged", | |
943 | RETURN_MASK_ALL); | |
944 | signal (SIGHUP, SIG_DFL); /*FIXME: ??????????? */ | |
945 | kill (getpid (), SIGHUP); | |
946 | } | |
947 | #endif | |
948 | ||
0f71a2f6 JM |
949 | #ifdef STOP_SIGNAL |
950 | void handle_stop_sig (sig) | |
951 | int sig; | |
952 | { | |
953 | mark_async_signal_handler_wrapper (sigtstp_token); | |
954 | signal (sig, handle_stop_sig); | |
955 | } | |
956 | ||
957 | static void | |
958 | async_stop_sig (arg) | |
959 | gdb_client_data arg; | |
960 | { | |
9e0b60a8 | 961 | char *prompt = get_prompt (); |
0f71a2f6 JM |
962 | #if STOP_SIGNAL == SIGTSTP |
963 | signal (SIGTSTP, SIG_DFL); | |
964 | sigsetmask (0); | |
965 | kill (getpid (), SIGTSTP); | |
966 | signal (SIGTSTP, handle_stop_sig); | |
967 | #else | |
968 | signal (STOP_SIGNAL, handle_stop_sig); | |
969 | #endif | |
970 | printf_unfiltered ("%s", prompt); | |
971 | gdb_flush (gdb_stdout); | |
972 | ||
973 | /* Forget about any previous command -- null line now will do nothing. */ | |
974 | dont_repeat (); | |
975 | } | |
976 | #endif /* STOP_SIGNAL */ | |
977 | ||
b5a0ac70 SS |
978 | /* Tell the event loop what to do if SIGFPE is received. |
979 | See event-signal.c. */ | |
0f71a2f6 | 980 | static void |
b5a0ac70 SS |
981 | handle_sigfpe (sig) |
982 | int sig; | |
983 | { | |
0f71a2f6 | 984 | mark_async_signal_handler_wrapper (sigfpe_token); |
b5a0ac70 SS |
985 | signal (sig, handle_sigfpe); |
986 | } | |
987 | ||
988 | /* Event loop will call this functin to process a SIGFPE. */ | |
0f71a2f6 JM |
989 | static void |
990 | async_float_handler (arg) | |
991 | gdb_client_data arg; | |
b5a0ac70 SS |
992 | { |
993 | /* This message is based on ANSI C, section 4.7. Note that integer | |
994 | divide by zero causes this, so "float" is a misnomer. */ | |
995 | error ("Erroneous arithmetic operation."); | |
996 | } | |
997 | ||
998 | /* Tell the event loop what to do if SIGWINCH is received. | |
999 | See event-signal.c. */ | |
1000 | #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER) | |
0f71a2f6 | 1001 | static void |
b5a0ac70 SS |
1002 | handle_sigwinch (sig) |
1003 | int sig; | |
1004 | { | |
0f71a2f6 | 1005 | mark_async_signal_handler_wrapper (sigwinch_token); |
b5a0ac70 SS |
1006 | signal (sig, handle_sigwinch); |
1007 | } | |
1008 | #endif | |
1009 | \f | |
1010 | ||
1011 | /* Called by do_setshow_command. */ | |
1012 | /* ARGSUSED */ | |
1013 | void | |
1014 | set_async_editing_command (args, from_tty, c) | |
1015 | char *args; | |
1016 | int from_tty; | |
1017 | struct cmd_list_element *c; | |
1018 | { | |
1019 | change_line_handler (); | |
1020 | } | |
1021 | ||
1022 | /* Called by do_setshow_command. */ | |
1023 | /* ARGSUSED */ | |
1024 | void | |
1025 | set_async_annotation_level (args, from_tty, c) | |
1026 | char *args; | |
1027 | int from_tty; | |
1028 | struct cmd_list_element *c; | |
1029 | { | |
1030 | change_annotation_level (); | |
1031 | } | |
1032 | ||
1033 | /* Called by do_setshow_command. */ | |
1034 | /* ARGSUSED */ | |
1035 | void | |
1036 | set_async_prompt (args, from_tty, c) | |
1037 | char *args; | |
1038 | int from_tty; | |
1039 | struct cmd_list_element *c; | |
1040 | { | |
1041 | PROMPT (0) = savestring (new_async_prompt, strlen (new_async_prompt)); | |
1042 | } | |
1043 | ||
0f71a2f6 JM |
1044 | /* Set things up for readline to be invoked via the alternate |
1045 | interface, i.e. via a callback function (rl_callback_read_char), | |
1046 | and hook up instream to the event loop.*/ | |
1047 | void | |
1048 | _initialize_event_loop () | |
1049 | { | |
9e0b60a8 JM |
1050 | if (async_p) |
1051 | { | |
1052 | /* When a character is detected on instream by select or poll, | |
1053 | readline will be invoked via this callback function. */ | |
1054 | call_readline = rl_callback_read_char; | |
1055 | ||
1056 | /* When readline has read an end-of-line character, it passes | |
1057 | the complete line to gdb for processing. command_line_handler | |
1058 | is the function that does this. */ | |
1059 | input_handler = command_line_handler; | |
1060 | ||
1061 | /* Tell readline to use the same input stream that gdb uses. */ | |
1062 | rl_instream = instream; | |
1063 | ||
1064 | /* Get a file descriptor for the input stream, so that we can | |
085dd6e6 | 1065 | register it with the event loop. */ |
9e0b60a8 JM |
1066 | input_fd = fileno (instream); |
1067 | ||
085dd6e6 JM |
1068 | /* Tell gdb to use the cli_command_loop as the main loop. */ |
1069 | command_loop_hook = cli_command_loop; | |
1070 | ||
9e0b60a8 JM |
1071 | /* Now we need to create the event sources for the input file |
1072 | descriptor. */ | |
1073 | /* At this point in time, this is the only event source that we | |
1074 | register with the even loop. Another source is going to be | |
1075 | the target program (inferior), but that must be registered | |
1076 | only when it actually exists (I.e. after we say 'run' or | |
1077 | after we connect to a remote target. */ | |
085dd6e6 JM |
1078 | add_file_handler (input_fd, (file_handler_func *) call_readline, 0); |
1079 | ||
1080 | /* Tell gdb that we will be using the readline library. This | |
1081 | could be overwritten by a command in .gdbinit like 'set | |
1082 | editing on' or 'off'. */ | |
1083 | async_command_editing_p = 1; | |
9e0b60a8 | 1084 | } |
0f71a2f6 | 1085 | } |
b5a0ac70 | 1086 |