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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" |
e514a9d6 | 25 | #include "target.h" |
c5aa993b | 26 | #include "terminal.h" /* for job_control */ |
c2c6d25f | 27 | #include "signals.h" |
9e0b60a8 | 28 | #include "event-loop.h" |
c2c6d25f | 29 | #include "event-top.h" |
b5a0ac70 | 30 | |
104c1213 JM |
31 | /* For dont_repeat() */ |
32 | #include "gdbcmd.h" | |
33 | ||
b5a0ac70 SS |
34 | /* readline include files */ |
35 | #include <readline/readline.h> | |
36 | #include <readline/history.h> | |
37 | ||
2acceee2 JM |
38 | #include <signal.h> |
39 | ||
b5a0ac70 SS |
40 | /* readline defines this. */ |
41 | #undef savestring | |
42 | ||
c2c6d25f | 43 | extern void _initialize_event_loop (void); |
b5a0ac70 | 44 | |
c2c6d25f JM |
45 | static void rl_callback_read_char_wrapper (gdb_client_data client_data); |
46 | static void command_line_handler (char *rl); | |
47 | static void command_line_handler_continuation (struct continuation_arg *arg); | |
48 | static void change_line_handler (void); | |
49 | static void change_annotation_level (void); | |
50 | static void command_handler (char *command); | |
51 | void cli_command_loop (void); | |
52 | static void async_do_nothing (gdb_client_data arg); | |
53 | static void async_disconnect (gdb_client_data arg); | |
54 | static void async_stop_sig (gdb_client_data arg); | |
55 | static void async_float_handler (gdb_client_data arg); | |
b5a0ac70 SS |
56 | |
57 | /* Signal handlers. */ | |
c2c6d25f JM |
58 | static void handle_sigquit (int sig); |
59 | static void handle_sighup (int sig); | |
60 | static void handle_sigfpe (int sig); | |
d4f3574e | 61 | #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER) |
c2c6d25f | 62 | static void handle_sigwinch (int sig); |
0f71a2f6 | 63 | #endif |
b5a0ac70 SS |
64 | |
65 | /* Functions to be invoked by the event loop in response to | |
66 | signals. */ | |
c2c6d25f JM |
67 | static void async_do_nothing (gdb_client_data); |
68 | static void async_disconnect (gdb_client_data); | |
69 | static void async_float_handler (gdb_client_data); | |
70 | static void async_stop_sig (gdb_client_data); | |
b5a0ac70 | 71 | |
b5a0ac70 SS |
72 | /* Readline offers an alternate interface, via callback |
73 | functions. These are all included in the file callback.c in the | |
74 | readline distribution. This file provides (mainly) a function, which | |
75 | the event loop uses as callback (i.e. event handler) whenever an event | |
76 | is detected on the standard input file descriptor. | |
77 | readline_callback_read_char is called (by the GDB event loop) whenever | |
78 | there is a new character ready on the input stream. This function | |
79 | incrementally builds a buffer internal to readline where it | |
80 | accumulates the line read up to the point of invocation. In the | |
81 | special case in which the character read is newline, the function | |
82 | invokes a GDB supplied callback routine, which does the processing of | |
83 | a full command line. This latter routine is the asynchronous analog | |
84 | of the old command_line_input in gdb. Instead of invoking (and waiting | |
85 | for) readline to read the command line and pass it back to | |
86 | command_loop for processing, the new command_line_handler function has | |
87 | the command line already available as its parameter. INPUT_HANDLER is | |
88 | to be set to the function that readline will invoke when a complete | |
89 | line of input is ready. CALL_READLINE is to be set to the function | |
90 | that readline offers as callback to the event_loop. */ | |
91 | ||
c2c6d25f JM |
92 | void (*input_handler) (char *); |
93 | void (*call_readline) (gdb_client_data); | |
b5a0ac70 SS |
94 | |
95 | /* Important variables for the event loop. */ | |
96 | ||
97 | /* This is used to determine if GDB is using the readline library or | |
98 | its own simplified form of readline. It is used by the asynchronous | |
0f71a2f6 | 99 | form of the set editing command. |
392a587b | 100 | ezannoni: as of 1999-04-29 I expect that this |
b5a0ac70 SS |
101 | variable will not be used after gdb is changed to use the event |
102 | loop as default engine, and event-top.c is merged into top.c. */ | |
103 | int async_command_editing_p; | |
104 | ||
105 | /* This variable contains the new prompt that the user sets with the | |
106 | set prompt command. */ | |
107 | char *new_async_prompt; | |
108 | ||
109 | /* This is the annotation suffix that will be used when the | |
110 | annotation_level is 2. */ | |
111 | char *async_annotation_suffix; | |
112 | ||
104c1213 JM |
113 | /* This is used to display the notification of the completion of an |
114 | asynchronous execution command. */ | |
115 | int exec_done_display_p = 0; | |
116 | ||
b5a0ac70 SS |
117 | /* This is the file descriptor for the input stream that GDB uses to |
118 | read commands from. */ | |
119 | int input_fd; | |
120 | ||
121 | /* This is the prompt stack. Prompts will be pushed on the stack as | |
122 | needed by the different 'kinds' of user inputs GDB is asking | |
123 | for. See event-loop.h. */ | |
124 | struct prompts the_prompts; | |
125 | ||
126 | /* signal handling variables */ | |
127 | /* Each of these is a pointer to a function that the event loop will | |
128 | invoke if the corresponding signal has received. The real signal | |
129 | handlers mark these functions as ready to be executed and the event | |
130 | loop, in a later iteration, calls them. See the function | |
131 | invoke_async_signal_handler. */ | |
0f71a2f6 | 132 | PTR sigint_token; |
b5a0ac70 | 133 | #ifdef SIGHUP |
0f71a2f6 | 134 | PTR sighup_token; |
b5a0ac70 | 135 | #endif |
0f71a2f6 JM |
136 | PTR sigquit_token; |
137 | PTR sigfpe_token; | |
b5a0ac70 | 138 | #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER) |
0f71a2f6 | 139 | PTR sigwinch_token; |
b5a0ac70 | 140 | #endif |
0f71a2f6 JM |
141 | #ifdef STOP_SIGNAL |
142 | PTR sigtstp_token; | |
143 | #endif | |
144 | ||
b5a0ac70 SS |
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 | ||
c2c6d25f JM |
160 | /* Wrapper function foe calling into the readline library. The event |
161 | loop expects the callback function to have a paramter, while readline | |
162 | expects none. */ | |
163 | static void | |
164 | rl_callback_read_char_wrapper (gdb_client_data client_data) | |
165 | { | |
166 | rl_callback_read_char (); | |
167 | } | |
168 | ||
b5a0ac70 | 169 | /* Initialize all the necessary variables, start the event loop, |
085dd6e6 | 170 | register readline, and stdin, start the loop. */ |
b5a0ac70 | 171 | void |
c2c6d25f | 172 | cli_command_loop (void) |
b5a0ac70 | 173 | { |
0f71a2f6 JM |
174 | int length; |
175 | char *a_prompt; | |
9e0b60a8 | 176 | char *gdb_prompt = get_prompt (); |
b5a0ac70 | 177 | |
0f71a2f6 JM |
178 | /* If we are using readline, set things up and display the first |
179 | prompt, otherwise just print the prompt. */ | |
180 | if (async_command_editing_p) | |
181 | { | |
182 | /* Tell readline what the prompt to display is and what function it | |
c5aa993b JM |
183 | will need to call after a whole line is read. This also displays |
184 | the first prompt. */ | |
9e0b60a8 | 185 | length = strlen (PREFIX (0)) + strlen (gdb_prompt) + strlen (SUFFIX (0)) + 1; |
0f71a2f6 JM |
186 | a_prompt = (char *) xmalloc (length); |
187 | strcpy (a_prompt, PREFIX (0)); | |
9e0b60a8 | 188 | strcat (a_prompt, gdb_prompt); |
0f71a2f6 JM |
189 | strcat (a_prompt, SUFFIX (0)); |
190 | rl_callback_handler_install (a_prompt, input_handler); | |
191 | } | |
192 | else | |
193 | display_gdb_prompt (0); | |
b5a0ac70 | 194 | |
085dd6e6 JM |
195 | /* Now it's time to start the event loop. */ |
196 | start_event_loop (); | |
b5a0ac70 SS |
197 | } |
198 | ||
199 | /* Change the function to be invoked every time there is a character | |
200 | ready on stdin. This is used when the user sets the editing off, | |
201 | therefore bypassing readline, and letting gdb handle the input | |
202 | itself, via gdb_readline2. Also it is used in the opposite case in | |
203 | which the user sets editing on again, by restoring readline | |
204 | handling of the input. */ | |
392a587b | 205 | static void |
c2c6d25f | 206 | change_line_handler (void) |
b5a0ac70 | 207 | { |
c2c6d25f JM |
208 | /* NOTE: this operates on input_fd, not instream. If we are reading |
209 | commands from a file, instream will point to the file. However in | |
210 | async mode, we always read commands from a file with editing | |
211 | off. This means that the 'set editing on/off' will have effect | |
212 | only on the interactive session. */ | |
213 | ||
b5a0ac70 SS |
214 | if (async_command_editing_p) |
215 | { | |
216 | /* Turn on editing by using readline. */ | |
c2c6d25f | 217 | call_readline = rl_callback_read_char_wrapper; |
0f71a2f6 | 218 | input_handler = command_line_handler; |
b5a0ac70 SS |
219 | } |
220 | else | |
221 | { | |
222 | /* Turn off editing by using gdb_readline2. */ | |
223 | rl_callback_handler_remove (); | |
224 | call_readline = gdb_readline2; | |
0f71a2f6 JM |
225 | |
226 | /* Set up the command handler as well, in case we are called as | |
c5aa993b | 227 | first thing from .gdbinit. */ |
0f71a2f6 | 228 | input_handler = command_line_handler; |
b5a0ac70 | 229 | } |
b5a0ac70 SS |
230 | } |
231 | ||
232 | /* Displays the prompt. The prompt that is displayed is the current | |
233 | top of the prompt stack, if the argument NEW_PROMPT is | |
234 | 0. Otherwise, it displays whatever NEW_PROMPT is. This is used | |
235 | after each gdb command has completed, and in the following cases: | |
0f71a2f6 JM |
236 | 1. when the user enters a command line which is ended by '\' |
237 | indicating that the command will continue on the next line. | |
b5a0ac70 | 238 | In that case the prompt that is displayed is the empty string. |
0f71a2f6 JM |
239 | 2. When the user is entering 'commands' for a breakpoint, or |
240 | actions for a tracepoint. In this case the prompt will be '>' | |
241 | 3. Other???? | |
b5a0ac70 SS |
242 | FIXME: 2. & 3. not implemented yet for async. */ |
243 | void | |
c2c6d25f | 244 | display_gdb_prompt (char *new_prompt) |
b5a0ac70 SS |
245 | { |
246 | int prompt_length = 0; | |
c5aa993b | 247 | char *gdb_prompt = get_prompt (); |
b5a0ac70 | 248 | |
adf40b2e | 249 | |
6426a772 | 250 | if (target_executing && sync_execution) |
adf40b2e JM |
251 | { |
252 | /* This is to trick readline into not trying to display the | |
6426a772 JM |
253 | prompt. Even though we display the prompt using this |
254 | function, readline still tries to do its own display if we | |
255 | don't call rl_callback_handler_install and | |
256 | rl_callback_handler_remove (which readline detects because a | |
257 | global variable is not set). If readline did that, it could | |
258 | mess up gdb signal handlers for SIGINT. Readline assumes | |
259 | that between calls to rl_set_signals and rl_clear_signals gdb | |
260 | doesn't do anything with the signal handlers. Well, that's | |
261 | not the case, because when the target executes we change the | |
262 | SIGINT signal handler. If we allowed readline to display the | |
263 | prompt, the signal handler change would happen exactly | |
264 | between the calls to the above two functions. | |
265 | Calling rl_callback_handler_remove(), does the job. */ | |
adf40b2e JM |
266 | |
267 | rl_callback_handler_remove (); | |
268 | return; | |
269 | } | |
270 | ||
b5a0ac70 SS |
271 | if (!new_prompt) |
272 | { | |
273 | /* Just use the top of the prompt stack. */ | |
274 | prompt_length = strlen (PREFIX (0)) + | |
275 | strlen (SUFFIX (0)) + | |
9e0b60a8 | 276 | strlen (gdb_prompt) + 1; |
b5a0ac70 SS |
277 | |
278 | new_prompt = (char *) alloca (prompt_length); | |
279 | ||
280 | /* Prefix needs to have new line at end. */ | |
281 | strcpy (new_prompt, PREFIX (0)); | |
9e0b60a8 | 282 | strcat (new_prompt, gdb_prompt); |
b5a0ac70 SS |
283 | /* Suffix needs to have a new line at end and \032 \032 at |
284 | beginning. */ | |
285 | strcat (new_prompt, SUFFIX (0)); | |
286 | } | |
287 | ||
288 | if (async_command_editing_p) | |
289 | { | |
290 | rl_callback_handler_remove (); | |
291 | rl_callback_handler_install (new_prompt, input_handler); | |
292 | } | |
adf40b2e | 293 | /* new_prompt at this point can be the top of the stack or the one passed in */ |
b5a0ac70 SS |
294 | else if (new_prompt) |
295 | { | |
296 | /* Don't use a _filtered function here. It causes the assumed | |
297 | character position to be off, since the newline we read from | |
298 | the user is not accounted for. */ | |
299 | fputs_unfiltered (new_prompt, gdb_stdout); | |
300 | ||
301 | #ifdef MPW | |
302 | /* Move to a new line so the entered line doesn't have a prompt | |
303 | on the front of it. */ | |
304 | fputs_unfiltered ("\n", gdb_stdout); | |
305 | #endif /* MPW */ | |
306 | gdb_flush (gdb_stdout); | |
307 | } | |
308 | } | |
309 | ||
310 | /* Used when the user requests a different annotation level, with | |
311 | 'set annotate'. It pushes a new prompt (with prefix and suffix) on top | |
312 | of the prompt stack, if the annotation level desired is 2, otherwise | |
313 | it pops the top of the prompt stack when we want the annotation level | |
adf40b2e | 314 | to be the normal ones (1 or 0). */ |
392a587b | 315 | static void |
c2c6d25f | 316 | change_annotation_level (void) |
b5a0ac70 SS |
317 | { |
318 | char *prefix, *suffix; | |
319 | ||
320 | if (!PREFIX (0) || !PROMPT (0) || !SUFFIX (0)) | |
321 | { | |
322 | /* The prompt stack has not been initialized to "", we are | |
323 | using gdb w/o the --async switch */ | |
324 | warning ("Command has same effect as set annotate"); | |
325 | return; | |
326 | } | |
327 | ||
328 | if (annotation_level > 1) | |
329 | { | |
330 | if (!strcmp (PREFIX (0), "") && !strcmp (SUFFIX (0), "")) | |
331 | { | |
332 | /* Push a new prompt if the previous annotation_level was not >1. */ | |
333 | prefix = (char *) alloca (strlen (async_annotation_suffix) + 10); | |
334 | strcpy (prefix, "\n\032\032pre-"); | |
335 | strcat (prefix, async_annotation_suffix); | |
336 | strcat (prefix, "\n"); | |
337 | ||
338 | suffix = (char *) alloca (strlen (async_annotation_suffix) + 6); | |
339 | strcpy (suffix, "\n\032\032"); | |
340 | strcat (suffix, async_annotation_suffix); | |
341 | strcat (suffix, "\n"); | |
342 | ||
343 | push_prompt (prefix, (char *) 0, suffix); | |
344 | } | |
345 | } | |
346 | else | |
347 | { | |
348 | if (strcmp (PREFIX (0), "") && strcmp (SUFFIX (0), "")) | |
349 | { | |
350 | /* Pop the top of the stack, we are going back to annotation < 1. */ | |
351 | pop_prompt (); | |
352 | } | |
353 | } | |
354 | } | |
355 | ||
356 | /* Pushes a new prompt on the prompt stack. Each prompt has three | |
357 | parts: prefix, prompt, suffix. Usually prefix and suffix are empty | |
358 | strings, except when the annotation level is 2. Memory is allocated | |
359 | within savestring for the new prompt. */ | |
43ff13b4 | 360 | void |
c2c6d25f | 361 | push_prompt (char *prefix, char *prompt, char *suffix) |
b5a0ac70 SS |
362 | { |
363 | the_prompts.top++; | |
364 | PREFIX (0) = savestring (prefix, strlen (prefix)); | |
365 | ||
43ff13b4 JM |
366 | /* Note that this function is used by the set annotate 2 |
367 | command. This is why we take care of saving the old prompt | |
368 | in case a new one is not specified. */ | |
b5a0ac70 SS |
369 | if (prompt) |
370 | PROMPT (0) = savestring (prompt, strlen (prompt)); | |
371 | else | |
372 | PROMPT (0) = savestring (PROMPT (-1), strlen (PROMPT (-1))); | |
373 | ||
374 | SUFFIX (0) = savestring (suffix, strlen (suffix)); | |
375 | } | |
376 | ||
377 | /* Pops the top of the prompt stack, and frees the memory allocated for it. */ | |
43ff13b4 | 378 | void |
c2c6d25f | 379 | pop_prompt (void) |
b5a0ac70 | 380 | { |
43ff13b4 JM |
381 | /* If we are not during a 'synchronous' execution command, in which |
382 | case, the top prompt would be empty. */ | |
383 | if (strcmp (PROMPT (0), "")) | |
384 | /* This is for the case in which the prompt is set while the | |
385 | annotation level is 2. The top prompt will be changed, but when | |
386 | we return to annotation level < 2, we want that new prompt to be | |
387 | in effect, until the user does another 'set prompt'. */ | |
388 | if (strcmp (PROMPT (0), PROMPT (-1))) | |
389 | { | |
390 | free (PROMPT (-1)); | |
391 | PROMPT (-1) = savestring (PROMPT (0), strlen (PROMPT (0))); | |
392 | } | |
b5a0ac70 SS |
393 | |
394 | free (PREFIX (0)); | |
395 | free (PROMPT (0)); | |
396 | free (SUFFIX (0)); | |
397 | the_prompts.top--; | |
398 | } | |
c2c6d25f JM |
399 | |
400 | /* When there is an event ready on the stdin file desriptor, instead | |
401 | of calling readline directly throught the callback function, or | |
402 | instead of calling gdb_readline2, give gdb a chance to detect | |
403 | errors and do something. */ | |
404 | void | |
2acceee2 | 405 | stdin_event_handler (int error, gdb_client_data client_data) |
c2c6d25f JM |
406 | { |
407 | if (error) | |
408 | { | |
2acceee2 JM |
409 | printf_unfiltered ("error detected on stdin\n"); |
410 | delete_file_handler (input_fd); | |
c2c6d25f JM |
411 | discard_all_continuations (); |
412 | /* If stdin died, we may as well kill gdb. */ | |
413 | exit (1); | |
414 | } | |
415 | else | |
6426a772 | 416 | (*call_readline) (client_data); |
c2c6d25f JM |
417 | } |
418 | ||
6426a772 JM |
419 | /* Re-enable stdin after the end of an execution command in |
420 | synchronous mode, or after an error from the target, and we aborted | |
421 | the exec operation. */ | |
422 | ||
423 | void | |
424 | async_enable_stdin (void *dummy) | |
425 | { | |
426 | /* See NOTE in async_disable_stdin() */ | |
427 | /* FIXME: cagney/1999-09-27: Call this before clearing | |
428 | sync_execution. Current target_terminal_ours() implementations | |
429 | check for sync_execution before switching the terminal. */ | |
430 | target_terminal_ours (); | |
431 | pop_prompt (); | |
432 | sync_execution = 0; | |
433 | } | |
434 | ||
435 | /* Disable reads from stdin (the console) marking the command as | |
436 | synchronous. */ | |
437 | ||
438 | void | |
439 | async_disable_stdin (void) | |
440 | { | |
441 | sync_execution = 1; | |
442 | push_prompt ("", "", ""); | |
443 | /* FIXME: cagney/1999-09-27: At present this call is technically | |
444 | redundant since infcmd.c and infrun.c both already call | |
445 | target_terminal_inferior(). As the terminal handling (in | |
446 | sync/async mode) is refined, the duplicate calls can be | |
447 | eliminated (Here or in infcmd.c/infrun.c). */ | |
448 | target_terminal_inferior (); | |
2acceee2 JM |
449 | /* Add the reinstate of stdin to the list of cleanups to be done |
450 | in case the target errors out and dies. These cleanups are also | |
451 | done in case of normal successful termination of the execution | |
452 | command, by complete_execution(). */ | |
6426a772 JM |
453 | make_exec_error_cleanup (async_enable_stdin, NULL); |
454 | } | |
b5a0ac70 | 455 | \f |
6426a772 | 456 | |
b5a0ac70 SS |
457 | /* Handles a gdb command. This function is called by |
458 | command_line_handler, which has processed one or more input lines | |
459 | into COMMAND. */ | |
392a587b | 460 | /* NOTE: 1999-04-30 This is the asynchronous version of the command_loop |
b5a0ac70 SS |
461 | function. The command_loop function will be obsolete when we |
462 | switch to use the event loop at every execution of gdb. */ | |
392a587b | 463 | static void |
c2c6d25f | 464 | command_handler (char *command) |
b5a0ac70 SS |
465 | { |
466 | struct cleanup *old_chain; | |
467 | int stdin_is_tty = ISATTY (stdin); | |
43ff13b4 JM |
468 | struct continuation_arg *arg1; |
469 | struct continuation_arg *arg2; | |
b5a0ac70 SS |
470 | long time_at_cmd_start; |
471 | #ifdef HAVE_SBRK | |
472 | long space_at_cmd_start = 0; | |
473 | #endif | |
474 | extern int display_time; | |
475 | extern int display_space; | |
476 | ||
477 | #if defined(TUI) | |
478 | extern int insert_mode; | |
479 | #endif | |
480 | ||
481 | quit_flag = 0; | |
482 | if (instream == stdin && stdin_is_tty) | |
483 | reinitialize_more_filter (); | |
484 | old_chain = make_cleanup ((make_cleanup_func) command_loop_marker, 0); | |
485 | ||
486 | #if defined(TUI) | |
487 | insert_mode = 0; | |
488 | #endif | |
489 | /* If readline returned a NULL command, it means that the | |
490 | connection with the terminal is gone. This happens at the | |
491 | end of a testsuite run, after Expect has hung up | |
492 | but GDB is still alive. In such a case, we just quit gdb | |
493 | killing the inferior program too. */ | |
494 | if (command == 0) | |
495 | quit_command ((char *) 0, stdin == instream); | |
496 | ||
497 | time_at_cmd_start = get_run_time (); | |
498 | ||
499 | if (display_space) | |
500 | { | |
501 | #ifdef HAVE_SBRK | |
502 | extern char **environ; | |
503 | char *lim = (char *) sbrk (0); | |
504 | ||
505 | space_at_cmd_start = (long) (lim - (char *) &environ); | |
506 | #endif | |
507 | } | |
508 | ||
509 | execute_command (command, instream == stdin); | |
c5aa993b | 510 | |
43ff13b4 JM |
511 | /* Set things up for this function to be compete later, once the |
512 | executin has completed, if we are doing an execution command, | |
513 | otherwise, just go ahead and finish. */ | |
6426a772 | 514 | if (target_can_async_p () && target_executing) |
43ff13b4 | 515 | { |
c5aa993b | 516 | arg1 = |
43ff13b4 | 517 | (struct continuation_arg *) xmalloc (sizeof (struct continuation_arg)); |
c5aa993b | 518 | arg2 = |
43ff13b4 JM |
519 | (struct continuation_arg *) xmalloc (sizeof (struct continuation_arg)); |
520 | arg1->next = arg2; | |
521 | arg2->next = NULL; | |
522 | arg1->data = (PTR) time_at_cmd_start; | |
523 | arg2->data = (PTR) space_at_cmd_start; | |
524 | add_continuation (command_line_handler_continuation, arg1); | |
525 | } | |
b5a0ac70 | 526 | |
43ff13b4 JM |
527 | /* Do any commands attached to breakpoint we stopped at. Only if we |
528 | are always running synchronously. Or if we have just executed a | |
529 | command that doesn't start the target. */ | |
6426a772 | 530 | if (!target_can_async_p () || !target_executing) |
43ff13b4 JM |
531 | { |
532 | bpstat_do_actions (&stop_bpstat); | |
533 | do_cleanups (old_chain); | |
c5aa993b | 534 | |
43ff13b4 JM |
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 | } | |
542 | ||
543 | if (display_space) | |
544 | { | |
545 | #ifdef HAVE_SBRK | |
546 | extern char **environ; | |
547 | char *lim = (char *) sbrk (0); | |
548 | long space_now = lim - (char *) &environ; | |
549 | long space_diff = space_now - space_at_cmd_start; | |
550 | ||
551 | printf_unfiltered ("Space used: %ld (%c%ld for this command)\n", | |
552 | space_now, | |
553 | (space_diff >= 0 ? '+' : '-'), | |
554 | space_diff); | |
555 | #endif | |
556 | } | |
557 | } | |
558 | } | |
559 | ||
560 | /* Do any commands attached to breakpoint we stopped at. Only if we | |
561 | are always running synchronously. Or if we have just executed a | |
562 | command that doesn't start the target. */ | |
563 | void | |
c2c6d25f | 564 | command_line_handler_continuation (struct continuation_arg *arg) |
c5aa993b | 565 | { |
43ff13b4 JM |
566 | extern int display_time; |
567 | extern int display_space; | |
568 | ||
569 | long time_at_cmd_start = (long) arg->data; | |
570 | long space_at_cmd_start = (long) arg->next->data; | |
b5a0ac70 | 571 | |
43ff13b4 | 572 | bpstat_do_actions (&stop_bpstat); |
c5aa993b JM |
573 | /*do_cleanups (old_chain); *//*?????FIXME????? */ |
574 | ||
b5a0ac70 SS |
575 | if (display_time) |
576 | { | |
577 | long cmd_time = get_run_time () - time_at_cmd_start; | |
578 | ||
579 | printf_unfiltered ("Command execution time: %ld.%06ld\n", | |
580 | cmd_time / 1000000, cmd_time % 1000000); | |
581 | } | |
b5a0ac70 SS |
582 | if (display_space) |
583 | { | |
584 | #ifdef HAVE_SBRK | |
585 | extern char **environ; | |
586 | char *lim = (char *) sbrk (0); | |
587 | long space_now = lim - (char *) &environ; | |
588 | long space_diff = space_now - space_at_cmd_start; | |
589 | ||
590 | printf_unfiltered ("Space used: %ld (%c%ld for this command)\n", | |
591 | space_now, | |
592 | (space_diff >= 0 ? '+' : '-'), | |
593 | space_diff); | |
594 | #endif | |
595 | } | |
596 | } | |
597 | ||
598 | /* Handle a complete line of input. This is called by the callback | |
599 | mechanism within the readline library. Deal with incomplete commands | |
600 | as well, by saving the partial input in a global buffer. */ | |
601 | ||
392a587b | 602 | /* NOTE: 1999-04-30 This is the asynchronous version of the |
b5a0ac70 SS |
603 | command_line_input function. command_line_input will become |
604 | obsolete once we use the event loop as the default mechanism in | |
605 | GDB. */ | |
606 | static void | |
c2c6d25f | 607 | command_line_handler (char *rl) |
b5a0ac70 SS |
608 | { |
609 | static char *linebuffer = 0; | |
610 | static unsigned linelength = 0; | |
611 | register char *p; | |
612 | char *p1; | |
b5a0ac70 SS |
613 | extern char *line; |
614 | extern int linesize; | |
615 | char *nline; | |
616 | char got_eof = 0; | |
617 | ||
618 | ||
619 | int repeat = (instream == stdin); | |
620 | ||
621 | if (annotation_level > 1 && instream == stdin) | |
622 | { | |
623 | printf_unfiltered ("\n\032\032post-"); | |
624 | printf_unfiltered (async_annotation_suffix); | |
625 | printf_unfiltered ("\n"); | |
626 | } | |
627 | ||
628 | if (linebuffer == 0) | |
629 | { | |
630 | linelength = 80; | |
631 | linebuffer = (char *) xmalloc (linelength); | |
632 | } | |
633 | ||
634 | p = linebuffer; | |
635 | ||
636 | if (more_to_come) | |
637 | { | |
638 | strcpy (linebuffer, readline_input_state.linebuffer); | |
639 | p = readline_input_state.linebuffer_ptr; | |
640 | free (readline_input_state.linebuffer); | |
641 | more_to_come = 0; | |
adf40b2e | 642 | pop_prompt (); |
b5a0ac70 SS |
643 | } |
644 | ||
645 | #ifdef STOP_SIGNAL | |
646 | if (job_control) | |
0f71a2f6 | 647 | signal (STOP_SIGNAL, handle_stop_sig); |
b5a0ac70 SS |
648 | #endif |
649 | ||
650 | /* Make sure that all output has been output. Some machines may let | |
651 | you get away with leaving out some of the gdb_flush, but not all. */ | |
652 | wrap_here (""); | |
653 | gdb_flush (gdb_stdout); | |
654 | gdb_flush (gdb_stderr); | |
655 | ||
656 | if (source_file_name != NULL) | |
657 | { | |
658 | ++source_line_number; | |
659 | sprintf (source_error, | |
660 | "%s%s:%d: Error in sourced command file:\n", | |
661 | source_pre_error, | |
662 | source_file_name, | |
663 | source_line_number); | |
664 | error_pre_print = source_error; | |
665 | } | |
666 | ||
667 | /* If we are in this case, then command_handler will call quit | |
668 | and exit from gdb. */ | |
669 | if (!rl || rl == (char *) EOF) | |
670 | { | |
671 | got_eof = 1; | |
672 | command_handler (0); | |
673 | } | |
674 | if (strlen (rl) + 1 + (p - linebuffer) > linelength) | |
675 | { | |
676 | linelength = strlen (rl) + 1 + (p - linebuffer); | |
677 | nline = (char *) xrealloc (linebuffer, linelength); | |
678 | p += nline - linebuffer; | |
679 | linebuffer = nline; | |
680 | } | |
681 | p1 = rl; | |
682 | /* Copy line. Don't copy null at end. (Leaves line alone | |
683 | if this was just a newline) */ | |
684 | while (*p1) | |
685 | *p++ = *p1++; | |
686 | ||
687 | free (rl); /* Allocated in readline. */ | |
688 | ||
a0b3c4fd | 689 | if (*(p - 1) == '\\') |
b5a0ac70 | 690 | { |
b5a0ac70 SS |
691 | p--; /* Put on top of '\'. */ |
692 | ||
693 | if (*p == '\\') | |
694 | { | |
695 | readline_input_state.linebuffer = savestring (linebuffer, | |
696 | strlen (linebuffer)); | |
697 | readline_input_state.linebuffer_ptr = p; | |
698 | ||
699 | /* We will not invoke a execute_command if there is more | |
700 | input expected to complete the command. So, we need to | |
701 | print an empty prompt here. */ | |
b5a0ac70 | 702 | more_to_come = 1; |
adf40b2e JM |
703 | push_prompt ("", "", ""); |
704 | display_gdb_prompt (0); | |
705 | return; | |
b5a0ac70 SS |
706 | } |
707 | } | |
708 | ||
709 | #ifdef STOP_SIGNAL | |
710 | if (job_control) | |
711 | signal (STOP_SIGNAL, SIG_DFL); | |
712 | #endif | |
713 | ||
714 | #define SERVER_COMMAND_LENGTH 7 | |
715 | server_command = | |
716 | (p - linebuffer > SERVER_COMMAND_LENGTH) | |
717 | && STREQN (linebuffer, "server ", SERVER_COMMAND_LENGTH); | |
718 | if (server_command) | |
719 | { | |
720 | /* Note that we don't set `line'. Between this and the check in | |
721 | dont_repeat, this insures that repeating will still do the | |
722 | right thing. */ | |
723 | *p = '\0'; | |
724 | command_handler (linebuffer + SERVER_COMMAND_LENGTH); | |
725 | display_gdb_prompt (0); | |
726 | return; | |
727 | } | |
728 | ||
729 | /* Do history expansion if that is wished. */ | |
730 | if (history_expansion_p && instream == stdin | |
731 | && ISATTY (instream)) | |
732 | { | |
733 | char *history_value; | |
734 | int expanded; | |
735 | ||
736 | *p = '\0'; /* Insert null now. */ | |
737 | expanded = history_expand (linebuffer, &history_value); | |
738 | if (expanded) | |
739 | { | |
740 | /* Print the changes. */ | |
741 | printf_unfiltered ("%s\n", history_value); | |
742 | ||
743 | /* If there was an error, call this function again. */ | |
744 | if (expanded < 0) | |
745 | { | |
746 | free (history_value); | |
747 | return; | |
748 | } | |
749 | if (strlen (history_value) > linelength) | |
750 | { | |
751 | linelength = strlen (history_value) + 1; | |
752 | linebuffer = (char *) xrealloc (linebuffer, linelength); | |
753 | } | |
754 | strcpy (linebuffer, history_value); | |
755 | p = linebuffer + strlen (linebuffer); | |
756 | free (history_value); | |
757 | } | |
758 | } | |
759 | ||
760 | /* If we just got an empty line, and that is supposed | |
761 | to repeat the previous command, return the value in the | |
762 | global buffer. */ | |
763 | if (repeat && p == linebuffer && *p != '\\') | |
764 | { | |
765 | command_handler (line); | |
766 | display_gdb_prompt (0); | |
767 | return; | |
768 | } | |
769 | ||
770 | for (p1 = linebuffer; *p1 == ' ' || *p1 == '\t'; p1++); | |
771 | if (repeat && !*p1) | |
772 | { | |
773 | command_handler (line); | |
774 | display_gdb_prompt (0); | |
775 | return; | |
776 | } | |
777 | ||
778 | *p = 0; | |
779 | ||
780 | /* Add line to history if appropriate. */ | |
781 | if (instream == stdin | |
782 | && ISATTY (stdin) && *linebuffer) | |
783 | add_history (linebuffer); | |
784 | ||
785 | /* Note: lines consisting solely of comments are added to the command | |
786 | history. This is useful when you type a command, and then | |
787 | realize you don't want to execute it quite yet. You can comment | |
788 | out the command and then later fetch it from the value history | |
789 | and remove the '#'. The kill ring is probably better, but some | |
790 | people are in the habit of commenting things out. */ | |
791 | if (*p1 == '#') | |
792 | *p1 = '\0'; /* Found a comment. */ | |
793 | ||
794 | /* Save into global buffer if appropriate. */ | |
795 | if (repeat) | |
796 | { | |
797 | if (linelength > linesize) | |
798 | { | |
799 | line = xrealloc (line, linelength); | |
800 | linesize = linelength; | |
801 | } | |
802 | strcpy (line, linebuffer); | |
803 | if (!more_to_come) | |
804 | { | |
805 | command_handler (line); | |
806 | display_gdb_prompt (0); | |
807 | } | |
808 | return; | |
809 | } | |
810 | ||
811 | command_handler (linebuffer); | |
812 | display_gdb_prompt (0); | |
813 | return; | |
814 | } | |
815 | ||
816 | /* Does reading of input from terminal w/o the editing features | |
817 | provided by the readline library. */ | |
818 | ||
392a587b | 819 | /* NOTE: 1999-04-30 Asynchronous version of gdb_readline. gdb_readline |
b5a0ac70 SS |
820 | will become obsolete when the event loop is made the default |
821 | execution for gdb. */ | |
085dd6e6 | 822 | void |
c2c6d25f | 823 | gdb_readline2 (gdb_client_data client_data) |
b5a0ac70 SS |
824 | { |
825 | int c; | |
826 | char *result; | |
827 | int input_index = 0; | |
828 | int result_size = 80; | |
7be570e7 JM |
829 | static int done_once = 0; |
830 | ||
831 | /* Unbuffer the input stream, so that, later on, the calls to fgetc | |
832 | fetch only one char at the time from the stream. The fgetc's will | |
833 | get up to the first newline, but there may be more chars in the | |
834 | stream after '\n'. If we buffer the input and fgetc drains the | |
835 | stream, getting stuff beyond the newline as well, a select, done | |
836 | afterwards will not trigger. */ | |
837 | if (!done_once && !ISATTY (instream)) | |
838 | { | |
839 | setbuf (instream, NULL); | |
840 | done_once = 1; | |
841 | } | |
b5a0ac70 SS |
842 | |
843 | result = (char *) xmalloc (result_size); | |
844 | ||
845 | /* We still need the while loop here, even though it would seem | |
846 | obvious to invoke gdb_readline2 at every character entered. If | |
847 | not using the readline library, the terminal is in cooked mode, | |
848 | which sends the characters all at once. Poll will notice that the | |
849 | input fd has changed state only after enter is pressed. At this | |
850 | point we still need to fetch all the chars entered. */ | |
851 | ||
852 | while (1) | |
853 | { | |
854 | /* Read from stdin if we are executing a user defined command. | |
855 | This is the right thing for prompt_for_continue, at least. */ | |
856 | c = fgetc (instream ? instream : stdin); | |
857 | ||
858 | if (c == EOF) | |
859 | { | |
860 | if (input_index > 0) | |
861 | /* The last line does not end with a newline. Return it, and | |
862 | if we are called again fgetc will still return EOF and | |
863 | we'll return NULL then. */ | |
864 | break; | |
865 | free (result); | |
0f71a2f6 | 866 | (*input_handler) (0); |
b5a0ac70 SS |
867 | } |
868 | ||
869 | if (c == '\n') | |
870 | #ifndef CRLF_SOURCE_FILES | |
871 | break; | |
872 | #else | |
873 | { | |
874 | if (input_index > 0 && result[input_index - 1] == '\r') | |
875 | input_index--; | |
876 | break; | |
877 | } | |
878 | #endif | |
879 | ||
880 | result[input_index++] = c; | |
881 | while (input_index >= result_size) | |
882 | { | |
883 | result_size *= 2; | |
884 | result = (char *) xrealloc (result, result_size); | |
885 | } | |
886 | } | |
887 | ||
888 | result[input_index++] = '\0'; | |
0f71a2f6 | 889 | (*input_handler) (result); |
b5a0ac70 SS |
890 | } |
891 | \f | |
892 | ||
893 | /* Initialization of signal handlers and tokens. There is a function | |
894 | handle_sig* for each of the signals GDB cares about. Specifically: | |
895 | SIGINT, SIGFPE, SIGQUIT, SIGTSTP, SIGHUP, SIGWINCH. These | |
896 | functions are the actual signal handlers associated to the signals | |
897 | via calls to signal(). The only job for these functions is to | |
898 | enqueue the appropriate event/procedure with the event loop. Such | |
899 | procedures are the old signal handlers. The event loop will take | |
900 | care of invoking the queued procedures to perform the usual tasks | |
901 | associated with the reception of the signal. */ | |
392a587b | 902 | /* NOTE: 1999-04-30 This is the asynchronous version of init_signals. |
b5a0ac70 SS |
903 | init_signals will become obsolete as we move to have to event loop |
904 | as the default for gdb. */ | |
905 | void | |
c2c6d25f | 906 | async_init_signals (void) |
c5aa993b | 907 | { |
b5a0ac70 SS |
908 | signal (SIGINT, handle_sigint); |
909 | sigint_token = | |
0f71a2f6 | 910 | create_async_signal_handler (async_request_quit, NULL); |
b5a0ac70 SS |
911 | |
912 | /* If SIGTRAP was set to SIG_IGN, then the SIG_IGN will get passed | |
913 | to the inferior and breakpoints will be ignored. */ | |
914 | #ifdef SIGTRAP | |
915 | signal (SIGTRAP, SIG_DFL); | |
916 | #endif | |
917 | ||
918 | /* If we initialize SIGQUIT to SIG_IGN, then the SIG_IGN will get | |
919 | passed to the inferior, which we don't want. It would be | |
920 | possible to do a "signal (SIGQUIT, SIG_DFL)" after we fork, but | |
921 | on BSD4.3 systems using vfork, that can affect the | |
922 | GDB process as well as the inferior (the signal handling tables | |
923 | might be in memory, shared between the two). Since we establish | |
924 | a handler for SIGQUIT, when we call exec it will set the signal | |
925 | to SIG_DFL for us. */ | |
926 | signal (SIGQUIT, handle_sigquit); | |
927 | sigquit_token = | |
0f71a2f6 | 928 | create_async_signal_handler (async_do_nothing, NULL); |
b5a0ac70 SS |
929 | #ifdef SIGHUP |
930 | if (signal (SIGHUP, handle_sighup) != SIG_IGN) | |
931 | sighup_token = | |
0f71a2f6 | 932 | create_async_signal_handler (async_disconnect, NULL); |
b5a0ac70 SS |
933 | else |
934 | sighup_token = | |
0f71a2f6 | 935 | create_async_signal_handler (async_do_nothing, NULL); |
b5a0ac70 SS |
936 | #endif |
937 | signal (SIGFPE, handle_sigfpe); | |
938 | sigfpe_token = | |
0f71a2f6 | 939 | create_async_signal_handler (async_float_handler, NULL); |
b5a0ac70 SS |
940 | |
941 | #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER) | |
942 | signal (SIGWINCH, handle_sigwinch); | |
943 | sigwinch_token = | |
0f71a2f6 | 944 | create_async_signal_handler (SIGWINCH_HANDLER, NULL); |
b5a0ac70 | 945 | #endif |
0f71a2f6 JM |
946 | #ifdef STOP_SIGNAL |
947 | sigtstp_token = | |
948 | create_async_signal_handler (async_stop_sig, NULL); | |
949 | #endif | |
950 | ||
951 | } | |
952 | ||
c5aa993b | 953 | void |
c2c6d25f | 954 | mark_async_signal_handler_wrapper (PTR token) |
0f71a2f6 | 955 | { |
c2c6d25f | 956 | mark_async_signal_handler ((struct async_signal_handler *) token); |
b5a0ac70 SS |
957 | } |
958 | ||
959 | /* Tell the event loop what to do if SIGINT is received. | |
960 | See event-signal.c. */ | |
c5aa993b | 961 | void |
c2c6d25f | 962 | handle_sigint (int sig) |
b5a0ac70 SS |
963 | { |
964 | signal (sig, handle_sigint); | |
965 | ||
966 | /* If immediate_quit is set, we go ahead and process the SIGINT right | |
967 | away, even if we usually would defer this to the event loop. The | |
968 | assumption here is that it is safe to process ^C immediately if | |
969 | immediate_quit is set. If we didn't, SIGINT would be really | |
970 | processed only the next time through the event loop. To get to | |
971 | that point, though, the command that we want to interrupt needs to | |
972 | finish first, which is unacceptable. */ | |
973 | if (immediate_quit) | |
0f71a2f6 | 974 | async_request_quit (0); |
b5a0ac70 SS |
975 | else |
976 | /* If immediate quit is not set, we process SIGINT the next time | |
977 | through the loop, which is fine. */ | |
0f71a2f6 | 978 | mark_async_signal_handler_wrapper (sigint_token); |
b5a0ac70 SS |
979 | } |
980 | ||
981 | /* Do the quit. All the checks have been done by the caller. */ | |
c5aa993b | 982 | void |
c2c6d25f | 983 | async_request_quit (gdb_client_data arg) |
b5a0ac70 SS |
984 | { |
985 | quit_flag = 1; | |
986 | #ifdef REQUEST_QUIT | |
987 | REQUEST_QUIT; | |
988 | #else | |
989 | quit (); | |
990 | #endif | |
991 | } | |
992 | ||
993 | /* Tell the event loop what to do if SIGQUIT is received. | |
994 | See event-signal.c. */ | |
c5aa993b | 995 | static void |
c2c6d25f | 996 | handle_sigquit (int sig) |
b5a0ac70 | 997 | { |
0f71a2f6 | 998 | mark_async_signal_handler_wrapper (sigquit_token); |
b5a0ac70 SS |
999 | signal (sig, handle_sigquit); |
1000 | } | |
1001 | ||
1002 | /* Called by the event loop in response to a SIGQUIT. */ | |
c5aa993b | 1003 | static void |
c2c6d25f | 1004 | async_do_nothing (gdb_client_data arg) |
b5a0ac70 SS |
1005 | { |
1006 | /* Empty function body. */ | |
1007 | } | |
1008 | ||
1009 | #ifdef SIGHUP | |
1010 | /* Tell the event loop what to do if SIGHUP is received. | |
1011 | See event-signal.c. */ | |
c5aa993b | 1012 | static void |
b5a0ac70 SS |
1013 | handle_sighup (sig) |
1014 | int sig; | |
1015 | { | |
0f71a2f6 | 1016 | mark_async_signal_handler_wrapper (sighup_token); |
b5a0ac70 SS |
1017 | signal (sig, handle_sighup); |
1018 | } | |
1019 | ||
0f71a2f6 | 1020 | /* Called by the event loop to process a SIGHUP */ |
c5aa993b | 1021 | static void |
c2c6d25f | 1022 | async_disconnect (gdb_client_data arg) |
b5a0ac70 SS |
1023 | { |
1024 | catch_errors (quit_cover, NULL, | |
1025 | "Could not kill the program being debugged", | |
1026 | RETURN_MASK_ALL); | |
1027 | signal (SIGHUP, SIG_DFL); /*FIXME: ??????????? */ | |
1028 | kill (getpid (), SIGHUP); | |
1029 | } | |
1030 | #endif | |
1031 | ||
0f71a2f6 | 1032 | #ifdef STOP_SIGNAL |
c5aa993b | 1033 | void |
c2c6d25f | 1034 | handle_stop_sig (int sig) |
0f71a2f6 | 1035 | { |
c5aa993b JM |
1036 | mark_async_signal_handler_wrapper (sigtstp_token); |
1037 | signal (sig, handle_stop_sig); | |
0f71a2f6 JM |
1038 | } |
1039 | ||
1040 | static void | |
c2c6d25f | 1041 | async_stop_sig (gdb_client_data arg) |
0f71a2f6 | 1042 | { |
c5aa993b | 1043 | char *prompt = get_prompt (); |
0f71a2f6 JM |
1044 | #if STOP_SIGNAL == SIGTSTP |
1045 | signal (SIGTSTP, SIG_DFL); | |
2acceee2 JM |
1046 | #if HAVE_SIGPROCMASK |
1047 | { | |
1048 | sigset_t zero; | |
1049 | sigemptyset (&zero); | |
1050 | sigprocmask (SIG_SETMASK, &zero, 0); | |
1051 | } | |
1052 | #else | |
0f71a2f6 | 1053 | sigsetmask (0); |
2acceee2 | 1054 | #endif |
0f71a2f6 JM |
1055 | kill (getpid (), SIGTSTP); |
1056 | signal (SIGTSTP, handle_stop_sig); | |
1057 | #else | |
1058 | signal (STOP_SIGNAL, handle_stop_sig); | |
1059 | #endif | |
1060 | printf_unfiltered ("%s", prompt); | |
1061 | gdb_flush (gdb_stdout); | |
1062 | ||
1063 | /* Forget about any previous command -- null line now will do nothing. */ | |
1064 | dont_repeat (); | |
1065 | } | |
1066 | #endif /* STOP_SIGNAL */ | |
1067 | ||
b5a0ac70 SS |
1068 | /* Tell the event loop what to do if SIGFPE is received. |
1069 | See event-signal.c. */ | |
c5aa993b | 1070 | static void |
c2c6d25f | 1071 | handle_sigfpe (int sig) |
b5a0ac70 | 1072 | { |
0f71a2f6 | 1073 | mark_async_signal_handler_wrapper (sigfpe_token); |
b5a0ac70 SS |
1074 | signal (sig, handle_sigfpe); |
1075 | } | |
1076 | ||
1077 | /* Event loop will call this functin to process a SIGFPE. */ | |
c5aa993b | 1078 | static void |
c2c6d25f | 1079 | async_float_handler (gdb_client_data arg) |
b5a0ac70 SS |
1080 | { |
1081 | /* This message is based on ANSI C, section 4.7. Note that integer | |
1082 | divide by zero causes this, so "float" is a misnomer. */ | |
1083 | error ("Erroneous arithmetic operation."); | |
1084 | } | |
1085 | ||
1086 | /* Tell the event loop what to do if SIGWINCH is received. | |
1087 | See event-signal.c. */ | |
1088 | #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER) | |
c5aa993b | 1089 | static void |
c2c6d25f | 1090 | handle_sigwinch (int sig) |
b5a0ac70 | 1091 | { |
0f71a2f6 | 1092 | mark_async_signal_handler_wrapper (sigwinch_token); |
b5a0ac70 SS |
1093 | signal (sig, handle_sigwinch); |
1094 | } | |
1095 | #endif | |
1096 | \f | |
1097 | ||
1098 | /* Called by do_setshow_command. */ | |
1099 | /* ARGSUSED */ | |
1100 | void | |
c2c6d25f | 1101 | set_async_editing_command (char *args, int from_tty, struct cmd_list_element *c) |
b5a0ac70 SS |
1102 | { |
1103 | change_line_handler (); | |
1104 | } | |
1105 | ||
1106 | /* Called by do_setshow_command. */ | |
1107 | /* ARGSUSED */ | |
1108 | void | |
c2c6d25f | 1109 | set_async_annotation_level (char *args, int from_tty, struct cmd_list_element *c) |
b5a0ac70 SS |
1110 | { |
1111 | change_annotation_level (); | |
1112 | } | |
1113 | ||
1114 | /* Called by do_setshow_command. */ | |
1115 | /* ARGSUSED */ | |
1116 | void | |
c2c6d25f | 1117 | set_async_prompt (char *args, int from_tty, struct cmd_list_element *c) |
b5a0ac70 SS |
1118 | { |
1119 | PROMPT (0) = savestring (new_async_prompt, strlen (new_async_prompt)); | |
1120 | } | |
1121 | ||
0f71a2f6 JM |
1122 | /* Set things up for readline to be invoked via the alternate |
1123 | interface, i.e. via a callback function (rl_callback_read_char), | |
c5aa993b | 1124 | and hook up instream to the event loop. */ |
0f71a2f6 | 1125 | void |
c2c6d25f | 1126 | _initialize_event_loop (void) |
0f71a2f6 | 1127 | { |
6426a772 | 1128 | if (event_loop_p) |
9e0b60a8 JM |
1129 | { |
1130 | /* When a character is detected on instream by select or poll, | |
c5aa993b | 1131 | readline will be invoked via this callback function. */ |
c2c6d25f | 1132 | call_readline = rl_callback_read_char_wrapper; |
9e0b60a8 JM |
1133 | |
1134 | /* When readline has read an end-of-line character, it passes | |
c5aa993b JM |
1135 | the complete line to gdb for processing. command_line_handler |
1136 | is the function that does this. */ | |
9e0b60a8 JM |
1137 | input_handler = command_line_handler; |
1138 | ||
1139 | /* Tell readline to use the same input stream that gdb uses. */ | |
1140 | rl_instream = instream; | |
1141 | ||
1142 | /* Get a file descriptor for the input stream, so that we can | |
085dd6e6 | 1143 | register it with the event loop. */ |
9e0b60a8 JM |
1144 | input_fd = fileno (instream); |
1145 | ||
085dd6e6 JM |
1146 | /* Tell gdb to use the cli_command_loop as the main loop. */ |
1147 | command_loop_hook = cli_command_loop; | |
1148 | ||
9e0b60a8 JM |
1149 | /* Now we need to create the event sources for the input file |
1150 | descriptor. */ | |
1151 | /* At this point in time, this is the only event source that we | |
c5aa993b JM |
1152 | register with the even loop. Another source is going to be |
1153 | the target program (inferior), but that must be registered | |
1154 | only when it actually exists (I.e. after we say 'run' or | |
1155 | after we connect to a remote target. */ | |
c2c6d25f | 1156 | add_file_handler (input_fd, stdin_event_handler, 0); |
c5aa993b | 1157 | |
085dd6e6 | 1158 | /* Tell gdb that we will be using the readline library. This |
c5aa993b JM |
1159 | could be overwritten by a command in .gdbinit like 'set |
1160 | editing on' or 'off'. */ | |
085dd6e6 | 1161 | async_command_editing_p = 1; |
9e0b60a8 | 1162 | } |
0f71a2f6 | 1163 | } |