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b5a0ac70 | 1 | /* Top level stuff for GDB, the GNU debugger. |
b6ba6518 | 2 | Copyright 1999, 2000, 2001 Free Software Foundation, Inc. |
b5a0ac70 SS |
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 */ |
9e0b60a8 | 27 | #include "event-loop.h" |
c2c6d25f | 28 | #include "event-top.h" |
042be3a9 | 29 | #include <signal.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 | ||
38 | /* readline defines this. */ | |
39 | #undef savestring | |
40 | ||
c2c6d25f | 41 | extern void _initialize_event_loop (void); |
b5a0ac70 | 42 | |
c2c6d25f JM |
43 | static void rl_callback_read_char_wrapper (gdb_client_data client_data); |
44 | static void command_line_handler (char *rl); | |
45 | static void command_line_handler_continuation (struct continuation_arg *arg); | |
46 | static void change_line_handler (void); | |
47 | static void change_annotation_level (void); | |
48 | static void command_handler (char *command); | |
49 | void cli_command_loop (void); | |
50 | static void async_do_nothing (gdb_client_data arg); | |
51 | static void async_disconnect (gdb_client_data arg); | |
52 | static void async_stop_sig (gdb_client_data arg); | |
53 | static void async_float_handler (gdb_client_data arg); | |
b5a0ac70 SS |
54 | |
55 | /* Signal handlers. */ | |
c2c6d25f JM |
56 | static void handle_sigquit (int sig); |
57 | static void handle_sighup (int sig); | |
58 | static void handle_sigfpe (int sig); | |
d4f3574e | 59 | #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER) |
c2c6d25f | 60 | static void handle_sigwinch (int sig); |
0f71a2f6 | 61 | #endif |
b5a0ac70 SS |
62 | |
63 | /* Functions to be invoked by the event loop in response to | |
64 | signals. */ | |
c2c6d25f JM |
65 | static void async_do_nothing (gdb_client_data); |
66 | static void async_disconnect (gdb_client_data); | |
67 | static void async_float_handler (gdb_client_data); | |
68 | static void async_stop_sig (gdb_client_data); | |
b5a0ac70 | 69 | |
b5a0ac70 SS |
70 | /* Readline offers an alternate interface, via callback |
71 | functions. These are all included in the file callback.c in the | |
72 | readline distribution. This file provides (mainly) a function, which | |
73 | the event loop uses as callback (i.e. event handler) whenever an event | |
74 | is detected on the standard input file descriptor. | |
75 | readline_callback_read_char is called (by the GDB event loop) whenever | |
76 | there is a new character ready on the input stream. This function | |
77 | incrementally builds a buffer internal to readline where it | |
78 | accumulates the line read up to the point of invocation. In the | |
79 | special case in which the character read is newline, the function | |
80 | invokes a GDB supplied callback routine, which does the processing of | |
81 | a full command line. This latter routine is the asynchronous analog | |
82 | of the old command_line_input in gdb. Instead of invoking (and waiting | |
83 | for) readline to read the command line and pass it back to | |
84 | command_loop for processing, the new command_line_handler function has | |
85 | the command line already available as its parameter. INPUT_HANDLER is | |
86 | to be set to the function that readline will invoke when a complete | |
87 | line of input is ready. CALL_READLINE is to be set to the function | |
88 | that readline offers as callback to the event_loop. */ | |
89 | ||
c2c6d25f JM |
90 | void (*input_handler) (char *); |
91 | void (*call_readline) (gdb_client_data); | |
b5a0ac70 SS |
92 | |
93 | /* Important variables for the event loop. */ | |
94 | ||
95 | /* This is used to determine if GDB is using the readline library or | |
96 | its own simplified form of readline. It is used by the asynchronous | |
0f71a2f6 | 97 | form of the set editing command. |
392a587b | 98 | ezannoni: as of 1999-04-29 I expect that this |
b5a0ac70 SS |
99 | variable will not be used after gdb is changed to use the event |
100 | loop as default engine, and event-top.c is merged into top.c. */ | |
101 | int async_command_editing_p; | |
102 | ||
103 | /* This variable contains the new prompt that the user sets with the | |
104 | set prompt command. */ | |
105 | char *new_async_prompt; | |
106 | ||
107 | /* This is the annotation suffix that will be used when the | |
108 | annotation_level is 2. */ | |
109 | char *async_annotation_suffix; | |
110 | ||
104c1213 JM |
111 | /* This is used to display the notification of the completion of an |
112 | asynchronous execution command. */ | |
113 | int exec_done_display_p = 0; | |
114 | ||
b5a0ac70 SS |
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. */ | |
97bb9d91 | 130 | void *sigint_token; |
b5a0ac70 | 131 | #ifdef SIGHUP |
97bb9d91 | 132 | void *sighup_token; |
b5a0ac70 | 133 | #endif |
97bb9d91 EZ |
134 | void *sigquit_token; |
135 | void *sigfpe_token; | |
b5a0ac70 | 136 | #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER) |
97bb9d91 | 137 | void *sigwinch_token; |
b5a0ac70 | 138 | #endif |
0f71a2f6 | 139 | #ifdef STOP_SIGNAL |
97bb9d91 | 140 | void *sigtstp_token; |
0f71a2f6 JM |
141 | #endif |
142 | ||
b5a0ac70 SS |
143 | /* Structure to save a partially entered command. This is used when |
144 | the user types '\' at the end of a command line. This is necessary | |
145 | because each line of input is handled by a different call to | |
146 | command_line_handler, and normally there is no state retained | |
147 | between different calls. */ | |
148 | int more_to_come = 0; | |
149 | ||
150 | struct readline_input_state | |
151 | { | |
152 | char *linebuffer; | |
153 | char *linebuffer_ptr; | |
154 | } | |
155 | readline_input_state; | |
467d8519 TT |
156 | |
157 | /* This hook is called by rl_callback_read_char_wrapper after each | |
158 | character is processed. */ | |
159 | void (*after_char_processing_hook) (); | |
b5a0ac70 SS |
160 | \f |
161 | ||
701f9765 | 162 | /* Wrapper function for calling into the readline library. The event |
c2c6d25f JM |
163 | loop expects the callback function to have a paramter, while readline |
164 | expects none. */ | |
165 | static void | |
166 | rl_callback_read_char_wrapper (gdb_client_data client_data) | |
167 | { | |
168 | rl_callback_read_char (); | |
467d8519 TT |
169 | if (after_char_processing_hook) |
170 | (*after_char_processing_hook) (); | |
c2c6d25f JM |
171 | } |
172 | ||
b5a0ac70 | 173 | /* Initialize all the necessary variables, start the event loop, |
085dd6e6 | 174 | register readline, and stdin, start the loop. */ |
b5a0ac70 | 175 | void |
c2c6d25f | 176 | cli_command_loop (void) |
b5a0ac70 | 177 | { |
0f71a2f6 JM |
178 | int length; |
179 | char *a_prompt; | |
9e0b60a8 | 180 | char *gdb_prompt = get_prompt (); |
b5a0ac70 | 181 | |
0f71a2f6 JM |
182 | /* If we are using readline, set things up and display the first |
183 | prompt, otherwise just print the prompt. */ | |
184 | if (async_command_editing_p) | |
185 | { | |
186 | /* Tell readline what the prompt to display is and what function it | |
c5aa993b JM |
187 | will need to call after a whole line is read. This also displays |
188 | the first prompt. */ | |
9e0b60a8 | 189 | length = strlen (PREFIX (0)) + strlen (gdb_prompt) + strlen (SUFFIX (0)) + 1; |
0f71a2f6 JM |
190 | a_prompt = (char *) xmalloc (length); |
191 | strcpy (a_prompt, PREFIX (0)); | |
9e0b60a8 | 192 | strcat (a_prompt, gdb_prompt); |
0f71a2f6 JM |
193 | strcat (a_prompt, SUFFIX (0)); |
194 | rl_callback_handler_install (a_prompt, input_handler); | |
195 | } | |
196 | else | |
197 | display_gdb_prompt (0); | |
b5a0ac70 | 198 | |
085dd6e6 JM |
199 | /* Now it's time to start the event loop. */ |
200 | start_event_loop (); | |
b5a0ac70 SS |
201 | } |
202 | ||
203 | /* Change the function to be invoked every time there is a character | |
204 | ready on stdin. This is used when the user sets the editing off, | |
205 | therefore bypassing readline, and letting gdb handle the input | |
206 | itself, via gdb_readline2. Also it is used in the opposite case in | |
207 | which the user sets editing on again, by restoring readline | |
208 | handling of the input. */ | |
392a587b | 209 | static void |
c2c6d25f | 210 | change_line_handler (void) |
b5a0ac70 | 211 | { |
c2c6d25f JM |
212 | /* NOTE: this operates on input_fd, not instream. If we are reading |
213 | commands from a file, instream will point to the file. However in | |
214 | async mode, we always read commands from a file with editing | |
215 | off. This means that the 'set editing on/off' will have effect | |
216 | only on the interactive session. */ | |
217 | ||
b5a0ac70 SS |
218 | if (async_command_editing_p) |
219 | { | |
220 | /* Turn on editing by using readline. */ | |
c2c6d25f | 221 | call_readline = rl_callback_read_char_wrapper; |
0f71a2f6 | 222 | input_handler = command_line_handler; |
b5a0ac70 SS |
223 | } |
224 | else | |
225 | { | |
226 | /* Turn off editing by using gdb_readline2. */ | |
227 | rl_callback_handler_remove (); | |
228 | call_readline = gdb_readline2; | |
0f71a2f6 JM |
229 | |
230 | /* Set up the command handler as well, in case we are called as | |
c5aa993b | 231 | first thing from .gdbinit. */ |
0f71a2f6 | 232 | input_handler = command_line_handler; |
b5a0ac70 | 233 | } |
b5a0ac70 SS |
234 | } |
235 | ||
236 | /* Displays the prompt. The prompt that is displayed is the current | |
237 | top of the prompt stack, if the argument NEW_PROMPT is | |
238 | 0. Otherwise, it displays whatever NEW_PROMPT is. This is used | |
239 | after each gdb command has completed, and in the following cases: | |
0f71a2f6 JM |
240 | 1. when the user enters a command line which is ended by '\' |
241 | indicating that the command will continue on the next line. | |
b5a0ac70 | 242 | In that case the prompt that is displayed is the empty string. |
0f71a2f6 JM |
243 | 2. When the user is entering 'commands' for a breakpoint, or |
244 | actions for a tracepoint. In this case the prompt will be '>' | |
245 | 3. Other???? | |
b5a0ac70 SS |
246 | FIXME: 2. & 3. not implemented yet for async. */ |
247 | void | |
c2c6d25f | 248 | display_gdb_prompt (char *new_prompt) |
b5a0ac70 SS |
249 | { |
250 | int prompt_length = 0; | |
c5aa993b | 251 | char *gdb_prompt = get_prompt (); |
b5a0ac70 | 252 | |
fb40c209 AC |
253 | #ifdef UI_OUT |
254 | /* When an alternative interpreter has been installed, do not | |
255 | display the comand prompt. */ | |
256 | if (interpreter_p) | |
257 | return; | |
258 | #endif | |
259 | ||
6426a772 | 260 | if (target_executing && sync_execution) |
adf40b2e JM |
261 | { |
262 | /* This is to trick readline into not trying to display the | |
6426a772 JM |
263 | prompt. Even though we display the prompt using this |
264 | function, readline still tries to do its own display if we | |
265 | don't call rl_callback_handler_install and | |
266 | rl_callback_handler_remove (which readline detects because a | |
267 | global variable is not set). If readline did that, it could | |
268 | mess up gdb signal handlers for SIGINT. Readline assumes | |
269 | that between calls to rl_set_signals and rl_clear_signals gdb | |
270 | doesn't do anything with the signal handlers. Well, that's | |
271 | not the case, because when the target executes we change the | |
272 | SIGINT signal handler. If we allowed readline to display the | |
273 | prompt, the signal handler change would happen exactly | |
274 | between the calls to the above two functions. | |
275 | Calling rl_callback_handler_remove(), does the job. */ | |
adf40b2e JM |
276 | |
277 | rl_callback_handler_remove (); | |
278 | return; | |
279 | } | |
280 | ||
b5a0ac70 SS |
281 | if (!new_prompt) |
282 | { | |
283 | /* Just use the top of the prompt stack. */ | |
284 | prompt_length = strlen (PREFIX (0)) + | |
285 | strlen (SUFFIX (0)) + | |
9e0b60a8 | 286 | strlen (gdb_prompt) + 1; |
b5a0ac70 SS |
287 | |
288 | new_prompt = (char *) alloca (prompt_length); | |
289 | ||
290 | /* Prefix needs to have new line at end. */ | |
291 | strcpy (new_prompt, PREFIX (0)); | |
9e0b60a8 | 292 | strcat (new_prompt, gdb_prompt); |
b5a0ac70 SS |
293 | /* Suffix needs to have a new line at end and \032 \032 at |
294 | beginning. */ | |
295 | strcat (new_prompt, SUFFIX (0)); | |
296 | } | |
297 | ||
298 | if (async_command_editing_p) | |
299 | { | |
300 | rl_callback_handler_remove (); | |
301 | rl_callback_handler_install (new_prompt, input_handler); | |
302 | } | |
adf40b2e | 303 | /* new_prompt at this point can be the top of the stack or the one passed in */ |
b5a0ac70 SS |
304 | else if (new_prompt) |
305 | { | |
306 | /* Don't use a _filtered function here. It causes the assumed | |
307 | character position to be off, since the newline we read from | |
308 | the user is not accounted for. */ | |
309 | fputs_unfiltered (new_prompt, gdb_stdout); | |
310 | ||
d036b4d9 AC |
311 | /* OBSOLETE #ifdef MPW */ |
312 | /* OBSOLETE *//* Move to a new line so the entered line doesn't have a prompt */ | |
313 | /* OBSOLETE on the front of it. */ | |
314 | /* OBSOLETE fputs_unfiltered ("\n", gdb_stdout); */ | |
315 | /* OBSOLETE #endif *//* MPW */ | |
b5a0ac70 SS |
316 | gdb_flush (gdb_stdout); |
317 | } | |
318 | } | |
319 | ||
320 | /* Used when the user requests a different annotation level, with | |
321 | 'set annotate'. It pushes a new prompt (with prefix and suffix) on top | |
322 | of the prompt stack, if the annotation level desired is 2, otherwise | |
323 | it pops the top of the prompt stack when we want the annotation level | |
adf40b2e | 324 | to be the normal ones (1 or 0). */ |
392a587b | 325 | static void |
c2c6d25f | 326 | change_annotation_level (void) |
b5a0ac70 SS |
327 | { |
328 | char *prefix, *suffix; | |
329 | ||
330 | if (!PREFIX (0) || !PROMPT (0) || !SUFFIX (0)) | |
331 | { | |
332 | /* The prompt stack has not been initialized to "", we are | |
333 | using gdb w/o the --async switch */ | |
334 | warning ("Command has same effect as set annotate"); | |
335 | return; | |
336 | } | |
337 | ||
338 | if (annotation_level > 1) | |
339 | { | |
340 | if (!strcmp (PREFIX (0), "") && !strcmp (SUFFIX (0), "")) | |
341 | { | |
342 | /* Push a new prompt if the previous annotation_level was not >1. */ | |
343 | prefix = (char *) alloca (strlen (async_annotation_suffix) + 10); | |
344 | strcpy (prefix, "\n\032\032pre-"); | |
345 | strcat (prefix, async_annotation_suffix); | |
346 | strcat (prefix, "\n"); | |
347 | ||
348 | suffix = (char *) alloca (strlen (async_annotation_suffix) + 6); | |
349 | strcpy (suffix, "\n\032\032"); | |
350 | strcat (suffix, async_annotation_suffix); | |
351 | strcat (suffix, "\n"); | |
352 | ||
353 | push_prompt (prefix, (char *) 0, suffix); | |
354 | } | |
355 | } | |
356 | else | |
357 | { | |
358 | if (strcmp (PREFIX (0), "") && strcmp (SUFFIX (0), "")) | |
359 | { | |
360 | /* Pop the top of the stack, we are going back to annotation < 1. */ | |
361 | pop_prompt (); | |
362 | } | |
363 | } | |
364 | } | |
365 | ||
366 | /* Pushes a new prompt on the prompt stack. Each prompt has three | |
367 | parts: prefix, prompt, suffix. Usually prefix and suffix are empty | |
368 | strings, except when the annotation level is 2. Memory is allocated | |
369 | within savestring for the new prompt. */ | |
43ff13b4 | 370 | void |
c2c6d25f | 371 | push_prompt (char *prefix, char *prompt, char *suffix) |
b5a0ac70 SS |
372 | { |
373 | the_prompts.top++; | |
374 | PREFIX (0) = savestring (prefix, strlen (prefix)); | |
375 | ||
43ff13b4 JM |
376 | /* Note that this function is used by the set annotate 2 |
377 | command. This is why we take care of saving the old prompt | |
378 | in case a new one is not specified. */ | |
b5a0ac70 SS |
379 | if (prompt) |
380 | PROMPT (0) = savestring (prompt, strlen (prompt)); | |
381 | else | |
382 | PROMPT (0) = savestring (PROMPT (-1), strlen (PROMPT (-1))); | |
383 | ||
384 | SUFFIX (0) = savestring (suffix, strlen (suffix)); | |
385 | } | |
386 | ||
387 | /* Pops the top of the prompt stack, and frees the memory allocated for it. */ | |
43ff13b4 | 388 | void |
c2c6d25f | 389 | pop_prompt (void) |
b5a0ac70 | 390 | { |
43ff13b4 JM |
391 | /* If we are not during a 'synchronous' execution command, in which |
392 | case, the top prompt would be empty. */ | |
393 | if (strcmp (PROMPT (0), "")) | |
394 | /* This is for the case in which the prompt is set while the | |
395 | annotation level is 2. The top prompt will be changed, but when | |
396 | we return to annotation level < 2, we want that new prompt to be | |
397 | in effect, until the user does another 'set prompt'. */ | |
398 | if (strcmp (PROMPT (0), PROMPT (-1))) | |
399 | { | |
b8c9b27d | 400 | xfree (PROMPT (-1)); |
43ff13b4 JM |
401 | PROMPT (-1) = savestring (PROMPT (0), strlen (PROMPT (0))); |
402 | } | |
b5a0ac70 | 403 | |
b8c9b27d KB |
404 | xfree (PREFIX (0)); |
405 | xfree (PROMPT (0)); | |
406 | xfree (SUFFIX (0)); | |
b5a0ac70 SS |
407 | the_prompts.top--; |
408 | } | |
c2c6d25f JM |
409 | |
410 | /* When there is an event ready on the stdin file desriptor, instead | |
411 | of calling readline directly throught the callback function, or | |
412 | instead of calling gdb_readline2, give gdb a chance to detect | |
413 | errors and do something. */ | |
414 | void | |
2acceee2 | 415 | stdin_event_handler (int error, gdb_client_data client_data) |
c2c6d25f JM |
416 | { |
417 | if (error) | |
418 | { | |
2acceee2 JM |
419 | printf_unfiltered ("error detected on stdin\n"); |
420 | delete_file_handler (input_fd); | |
c2c6d25f JM |
421 | discard_all_continuations (); |
422 | /* If stdin died, we may as well kill gdb. */ | |
c5394b80 | 423 | quit_command ((char *) 0, stdin == instream); |
c2c6d25f JM |
424 | } |
425 | else | |
6426a772 | 426 | (*call_readline) (client_data); |
c2c6d25f JM |
427 | } |
428 | ||
6426a772 JM |
429 | /* Re-enable stdin after the end of an execution command in |
430 | synchronous mode, or after an error from the target, and we aborted | |
431 | the exec operation. */ | |
432 | ||
433 | void | |
434 | async_enable_stdin (void *dummy) | |
435 | { | |
436 | /* See NOTE in async_disable_stdin() */ | |
437 | /* FIXME: cagney/1999-09-27: Call this before clearing | |
438 | sync_execution. Current target_terminal_ours() implementations | |
439 | check for sync_execution before switching the terminal. */ | |
440 | target_terminal_ours (); | |
441 | pop_prompt (); | |
442 | sync_execution = 0; | |
443 | } | |
444 | ||
445 | /* Disable reads from stdin (the console) marking the command as | |
446 | synchronous. */ | |
447 | ||
448 | void | |
449 | async_disable_stdin (void) | |
450 | { | |
451 | sync_execution = 1; | |
452 | push_prompt ("", "", ""); | |
453 | /* FIXME: cagney/1999-09-27: At present this call is technically | |
454 | redundant since infcmd.c and infrun.c both already call | |
455 | target_terminal_inferior(). As the terminal handling (in | |
456 | sync/async mode) is refined, the duplicate calls can be | |
457 | eliminated (Here or in infcmd.c/infrun.c). */ | |
458 | target_terminal_inferior (); | |
2acceee2 JM |
459 | /* Add the reinstate of stdin to the list of cleanups to be done |
460 | in case the target errors out and dies. These cleanups are also | |
461 | done in case of normal successful termination of the execution | |
462 | command, by complete_execution(). */ | |
6426a772 JM |
463 | make_exec_error_cleanup (async_enable_stdin, NULL); |
464 | } | |
b5a0ac70 | 465 | \f |
6426a772 | 466 | |
b5a0ac70 SS |
467 | /* Handles a gdb command. This function is called by |
468 | command_line_handler, which has processed one or more input lines | |
469 | into COMMAND. */ | |
392a587b | 470 | /* NOTE: 1999-04-30 This is the asynchronous version of the command_loop |
b5a0ac70 SS |
471 | function. The command_loop function will be obsolete when we |
472 | switch to use the event loop at every execution of gdb. */ | |
392a587b | 473 | static void |
c2c6d25f | 474 | command_handler (char *command) |
b5a0ac70 SS |
475 | { |
476 | struct cleanup *old_chain; | |
477 | int stdin_is_tty = ISATTY (stdin); | |
43ff13b4 JM |
478 | struct continuation_arg *arg1; |
479 | struct continuation_arg *arg2; | |
b5a0ac70 SS |
480 | long time_at_cmd_start; |
481 | #ifdef HAVE_SBRK | |
482 | long space_at_cmd_start = 0; | |
483 | #endif | |
484 | extern int display_time; | |
485 | extern int display_space; | |
486 | ||
b5a0ac70 SS |
487 | quit_flag = 0; |
488 | if (instream == stdin && stdin_is_tty) | |
489 | reinitialize_more_filter (); | |
e2273c6d | 490 | old_chain = make_cleanup (null_cleanup, 0); |
b5a0ac70 | 491 | |
b5a0ac70 SS |
492 | /* If readline returned a NULL command, it means that the |
493 | connection with the terminal is gone. This happens at the | |
494 | end of a testsuite run, after Expect has hung up | |
495 | but GDB is still alive. In such a case, we just quit gdb | |
496 | killing the inferior program too. */ | |
497 | if (command == 0) | |
498 | quit_command ((char *) 0, stdin == instream); | |
499 | ||
500 | time_at_cmd_start = get_run_time (); | |
501 | ||
502 | if (display_space) | |
503 | { | |
504 | #ifdef HAVE_SBRK | |
505 | extern char **environ; | |
506 | char *lim = (char *) sbrk (0); | |
507 | ||
508 | space_at_cmd_start = (long) (lim - (char *) &environ); | |
509 | #endif | |
510 | } | |
511 | ||
512 | execute_command (command, instream == stdin); | |
c5aa993b | 513 | |
43ff13b4 | 514 | /* Set things up for this function to be compete later, once the |
701f9765 | 515 | execution has completed, if we are doing an execution command, |
43ff13b4 | 516 | otherwise, just go ahead and finish. */ |
6426a772 | 517 | if (target_can_async_p () && target_executing) |
43ff13b4 | 518 | { |
c5aa993b | 519 | arg1 = |
43ff13b4 | 520 | (struct continuation_arg *) xmalloc (sizeof (struct continuation_arg)); |
c5aa993b | 521 | arg2 = |
43ff13b4 JM |
522 | (struct continuation_arg *) xmalloc (sizeof (struct continuation_arg)); |
523 | arg1->next = arg2; | |
524 | arg2->next = NULL; | |
57e687d9 MS |
525 | arg1->data.integer = time_at_cmd_start; |
526 | arg2->data.integer = space_at_cmd_start; | |
43ff13b4 JM |
527 | add_continuation (command_line_handler_continuation, arg1); |
528 | } | |
b5a0ac70 | 529 | |
43ff13b4 JM |
530 | /* Do any commands attached to breakpoint we stopped at. Only if we |
531 | are always running synchronously. Or if we have just executed a | |
532 | command that doesn't start the target. */ | |
6426a772 | 533 | if (!target_can_async_p () || !target_executing) |
43ff13b4 JM |
534 | { |
535 | bpstat_do_actions (&stop_bpstat); | |
536 | do_cleanups (old_chain); | |
c5aa993b | 537 | |
43ff13b4 JM |
538 | if (display_time) |
539 | { | |
540 | long cmd_time = get_run_time () - time_at_cmd_start; | |
541 | ||
542 | printf_unfiltered ("Command execution time: %ld.%06ld\n", | |
543 | cmd_time / 1000000, cmd_time % 1000000); | |
544 | } | |
545 | ||
546 | if (display_space) | |
547 | { | |
548 | #ifdef HAVE_SBRK | |
549 | extern char **environ; | |
550 | char *lim = (char *) sbrk (0); | |
551 | long space_now = lim - (char *) &environ; | |
552 | long space_diff = space_now - space_at_cmd_start; | |
553 | ||
554 | printf_unfiltered ("Space used: %ld (%c%ld for this command)\n", | |
555 | space_now, | |
556 | (space_diff >= 0 ? '+' : '-'), | |
557 | space_diff); | |
558 | #endif | |
559 | } | |
560 | } | |
561 | } | |
562 | ||
563 | /* Do any commands attached to breakpoint we stopped at. Only if we | |
564 | are always running synchronously. Or if we have just executed a | |
565 | command that doesn't start the target. */ | |
566 | void | |
c2c6d25f | 567 | command_line_handler_continuation (struct continuation_arg *arg) |
c5aa993b | 568 | { |
43ff13b4 JM |
569 | extern int display_time; |
570 | extern int display_space; | |
571 | ||
57e687d9 MS |
572 | long time_at_cmd_start = arg->data.longint; |
573 | long space_at_cmd_start = arg->next->data.longint; | |
b5a0ac70 | 574 | |
43ff13b4 | 575 | bpstat_do_actions (&stop_bpstat); |
c5aa993b JM |
576 | /*do_cleanups (old_chain); *//*?????FIXME????? */ |
577 | ||
b5a0ac70 SS |
578 | if (display_time) |
579 | { | |
580 | long cmd_time = get_run_time () - time_at_cmd_start; | |
581 | ||
582 | printf_unfiltered ("Command execution time: %ld.%06ld\n", | |
583 | cmd_time / 1000000, cmd_time % 1000000); | |
584 | } | |
b5a0ac70 SS |
585 | if (display_space) |
586 | { | |
587 | #ifdef HAVE_SBRK | |
588 | extern char **environ; | |
589 | char *lim = (char *) sbrk (0); | |
590 | long space_now = lim - (char *) &environ; | |
591 | long space_diff = space_now - space_at_cmd_start; | |
592 | ||
593 | printf_unfiltered ("Space used: %ld (%c%ld for this command)\n", | |
594 | space_now, | |
595 | (space_diff >= 0 ? '+' : '-'), | |
596 | space_diff); | |
597 | #endif | |
598 | } | |
599 | } | |
600 | ||
601 | /* Handle a complete line of input. This is called by the callback | |
602 | mechanism within the readline library. Deal with incomplete commands | |
603 | as well, by saving the partial input in a global buffer. */ | |
604 | ||
392a587b | 605 | /* NOTE: 1999-04-30 This is the asynchronous version of the |
b5a0ac70 SS |
606 | command_line_input function. command_line_input will become |
607 | obsolete once we use the event loop as the default mechanism in | |
608 | GDB. */ | |
609 | static void | |
c2c6d25f | 610 | command_line_handler (char *rl) |
b5a0ac70 SS |
611 | { |
612 | static char *linebuffer = 0; | |
613 | static unsigned linelength = 0; | |
614 | register char *p; | |
615 | char *p1; | |
b5a0ac70 SS |
616 | extern char *line; |
617 | extern int linesize; | |
618 | char *nline; | |
619 | char got_eof = 0; | |
620 | ||
621 | ||
622 | int repeat = (instream == stdin); | |
623 | ||
624 | if (annotation_level > 1 && instream == stdin) | |
625 | { | |
626 | printf_unfiltered ("\n\032\032post-"); | |
627 | printf_unfiltered (async_annotation_suffix); | |
628 | printf_unfiltered ("\n"); | |
629 | } | |
630 | ||
631 | if (linebuffer == 0) | |
632 | { | |
633 | linelength = 80; | |
634 | linebuffer = (char *) xmalloc (linelength); | |
635 | } | |
636 | ||
637 | p = linebuffer; | |
638 | ||
639 | if (more_to_come) | |
640 | { | |
641 | strcpy (linebuffer, readline_input_state.linebuffer); | |
642 | p = readline_input_state.linebuffer_ptr; | |
b8c9b27d | 643 | xfree (readline_input_state.linebuffer); |
b5a0ac70 | 644 | more_to_come = 0; |
adf40b2e | 645 | pop_prompt (); |
b5a0ac70 SS |
646 | } |
647 | ||
648 | #ifdef STOP_SIGNAL | |
649 | if (job_control) | |
0f71a2f6 | 650 | signal (STOP_SIGNAL, handle_stop_sig); |
b5a0ac70 SS |
651 | #endif |
652 | ||
653 | /* Make sure that all output has been output. Some machines may let | |
654 | you get away with leaving out some of the gdb_flush, but not all. */ | |
655 | wrap_here (""); | |
656 | gdb_flush (gdb_stdout); | |
657 | gdb_flush (gdb_stderr); | |
658 | ||
659 | if (source_file_name != NULL) | |
660 | { | |
661 | ++source_line_number; | |
662 | sprintf (source_error, | |
663 | "%s%s:%d: Error in sourced command file:\n", | |
664 | source_pre_error, | |
665 | source_file_name, | |
666 | source_line_number); | |
667 | error_pre_print = source_error; | |
668 | } | |
669 | ||
670 | /* If we are in this case, then command_handler will call quit | |
671 | and exit from gdb. */ | |
672 | if (!rl || rl == (char *) EOF) | |
673 | { | |
674 | got_eof = 1; | |
675 | command_handler (0); | |
676 | } | |
677 | if (strlen (rl) + 1 + (p - linebuffer) > linelength) | |
678 | { | |
679 | linelength = strlen (rl) + 1 + (p - linebuffer); | |
680 | nline = (char *) xrealloc (linebuffer, linelength); | |
681 | p += nline - linebuffer; | |
682 | linebuffer = nline; | |
683 | } | |
684 | p1 = rl; | |
685 | /* Copy line. Don't copy null at end. (Leaves line alone | |
686 | if this was just a newline) */ | |
687 | while (*p1) | |
688 | *p++ = *p1++; | |
689 | ||
b8c9b27d | 690 | xfree (rl); /* Allocated in readline. */ |
b5a0ac70 | 691 | |
a0b3c4fd | 692 | if (*(p - 1) == '\\') |
b5a0ac70 | 693 | { |
b5a0ac70 SS |
694 | p--; /* Put on top of '\'. */ |
695 | ||
696 | if (*p == '\\') | |
697 | { | |
698 | readline_input_state.linebuffer = savestring (linebuffer, | |
699 | strlen (linebuffer)); | |
700 | readline_input_state.linebuffer_ptr = p; | |
701 | ||
702 | /* We will not invoke a execute_command if there is more | |
703 | input expected to complete the command. So, we need to | |
704 | print an empty prompt here. */ | |
b5a0ac70 | 705 | more_to_come = 1; |
adf40b2e JM |
706 | push_prompt ("", "", ""); |
707 | display_gdb_prompt (0); | |
708 | return; | |
b5a0ac70 SS |
709 | } |
710 | } | |
711 | ||
712 | #ifdef STOP_SIGNAL | |
713 | if (job_control) | |
714 | signal (STOP_SIGNAL, SIG_DFL); | |
715 | #endif | |
716 | ||
717 | #define SERVER_COMMAND_LENGTH 7 | |
718 | server_command = | |
719 | (p - linebuffer > SERVER_COMMAND_LENGTH) | |
720 | && STREQN (linebuffer, "server ", SERVER_COMMAND_LENGTH); | |
721 | if (server_command) | |
722 | { | |
723 | /* Note that we don't set `line'. Between this and the check in | |
724 | dont_repeat, this insures that repeating will still do the | |
725 | right thing. */ | |
726 | *p = '\0'; | |
727 | command_handler (linebuffer + SERVER_COMMAND_LENGTH); | |
728 | display_gdb_prompt (0); | |
729 | return; | |
730 | } | |
731 | ||
732 | /* Do history expansion if that is wished. */ | |
733 | if (history_expansion_p && instream == stdin | |
734 | && ISATTY (instream)) | |
735 | { | |
736 | char *history_value; | |
737 | int expanded; | |
738 | ||
739 | *p = '\0'; /* Insert null now. */ | |
740 | expanded = history_expand (linebuffer, &history_value); | |
741 | if (expanded) | |
742 | { | |
743 | /* Print the changes. */ | |
744 | printf_unfiltered ("%s\n", history_value); | |
745 | ||
746 | /* If there was an error, call this function again. */ | |
747 | if (expanded < 0) | |
748 | { | |
b8c9b27d | 749 | xfree (history_value); |
b5a0ac70 SS |
750 | return; |
751 | } | |
752 | if (strlen (history_value) > linelength) | |
753 | { | |
754 | linelength = strlen (history_value) + 1; | |
755 | linebuffer = (char *) xrealloc (linebuffer, linelength); | |
756 | } | |
757 | strcpy (linebuffer, history_value); | |
758 | p = linebuffer + strlen (linebuffer); | |
b8c9b27d | 759 | xfree (history_value); |
b5a0ac70 SS |
760 | } |
761 | } | |
762 | ||
763 | /* If we just got an empty line, and that is supposed | |
764 | to repeat the previous command, return the value in the | |
765 | global buffer. */ | |
766 | if (repeat && p == linebuffer && *p != '\\') | |
767 | { | |
768 | command_handler (line); | |
769 | display_gdb_prompt (0); | |
770 | return; | |
771 | } | |
772 | ||
773 | for (p1 = linebuffer; *p1 == ' ' || *p1 == '\t'; p1++); | |
774 | if (repeat && !*p1) | |
775 | { | |
776 | command_handler (line); | |
777 | display_gdb_prompt (0); | |
778 | return; | |
779 | } | |
780 | ||
781 | *p = 0; | |
782 | ||
783 | /* Add line to history if appropriate. */ | |
784 | if (instream == stdin | |
785 | && ISATTY (stdin) && *linebuffer) | |
786 | add_history (linebuffer); | |
787 | ||
788 | /* Note: lines consisting solely of comments are added to the command | |
789 | history. This is useful when you type a command, and then | |
790 | realize you don't want to execute it quite yet. You can comment | |
791 | out the command and then later fetch it from the value history | |
792 | and remove the '#'. The kill ring is probably better, but some | |
793 | people are in the habit of commenting things out. */ | |
794 | if (*p1 == '#') | |
795 | *p1 = '\0'; /* Found a comment. */ | |
796 | ||
797 | /* Save into global buffer if appropriate. */ | |
798 | if (repeat) | |
799 | { | |
800 | if (linelength > linesize) | |
801 | { | |
802 | line = xrealloc (line, linelength); | |
803 | linesize = linelength; | |
804 | } | |
805 | strcpy (line, linebuffer); | |
806 | if (!more_to_come) | |
807 | { | |
808 | command_handler (line); | |
809 | display_gdb_prompt (0); | |
810 | } | |
811 | return; | |
812 | } | |
813 | ||
814 | command_handler (linebuffer); | |
815 | display_gdb_prompt (0); | |
816 | return; | |
817 | } | |
818 | ||
819 | /* Does reading of input from terminal w/o the editing features | |
820 | provided by the readline library. */ | |
821 | ||
392a587b | 822 | /* NOTE: 1999-04-30 Asynchronous version of gdb_readline. gdb_readline |
b5a0ac70 SS |
823 | will become obsolete when the event loop is made the default |
824 | execution for gdb. */ | |
085dd6e6 | 825 | void |
c2c6d25f | 826 | gdb_readline2 (gdb_client_data client_data) |
b5a0ac70 SS |
827 | { |
828 | int c; | |
829 | char *result; | |
830 | int input_index = 0; | |
831 | int result_size = 80; | |
7be570e7 JM |
832 | static int done_once = 0; |
833 | ||
834 | /* Unbuffer the input stream, so that, later on, the calls to fgetc | |
835 | fetch only one char at the time from the stream. The fgetc's will | |
836 | get up to the first newline, but there may be more chars in the | |
837 | stream after '\n'. If we buffer the input and fgetc drains the | |
838 | stream, getting stuff beyond the newline as well, a select, done | |
839 | afterwards will not trigger. */ | |
840 | if (!done_once && !ISATTY (instream)) | |
841 | { | |
842 | setbuf (instream, NULL); | |
843 | done_once = 1; | |
844 | } | |
b5a0ac70 SS |
845 | |
846 | result = (char *) xmalloc (result_size); | |
847 | ||
848 | /* We still need the while loop here, even though it would seem | |
849 | obvious to invoke gdb_readline2 at every character entered. If | |
850 | not using the readline library, the terminal is in cooked mode, | |
851 | which sends the characters all at once. Poll will notice that the | |
852 | input fd has changed state only after enter is pressed. At this | |
853 | point we still need to fetch all the chars entered. */ | |
854 | ||
855 | while (1) | |
856 | { | |
857 | /* Read from stdin if we are executing a user defined command. | |
858 | This is the right thing for prompt_for_continue, at least. */ | |
859 | c = fgetc (instream ? instream : stdin); | |
860 | ||
861 | if (c == EOF) | |
862 | { | |
863 | if (input_index > 0) | |
864 | /* The last line does not end with a newline. Return it, and | |
865 | if we are called again fgetc will still return EOF and | |
866 | we'll return NULL then. */ | |
867 | break; | |
b8c9b27d | 868 | xfree (result); |
0f71a2f6 | 869 | (*input_handler) (0); |
b5a0ac70 SS |
870 | } |
871 | ||
872 | if (c == '\n') | |
873 | #ifndef CRLF_SOURCE_FILES | |
874 | break; | |
875 | #else | |
876 | { | |
877 | if (input_index > 0 && result[input_index - 1] == '\r') | |
878 | input_index--; | |
879 | break; | |
880 | } | |
881 | #endif | |
882 | ||
883 | result[input_index++] = c; | |
884 | while (input_index >= result_size) | |
885 | { | |
886 | result_size *= 2; | |
887 | result = (char *) xrealloc (result, result_size); | |
888 | } | |
889 | } | |
890 | ||
891 | result[input_index++] = '\0'; | |
0f71a2f6 | 892 | (*input_handler) (result); |
b5a0ac70 SS |
893 | } |
894 | \f | |
895 | ||
896 | /* Initialization of signal handlers and tokens. There is a function | |
897 | handle_sig* for each of the signals GDB cares about. Specifically: | |
898 | SIGINT, SIGFPE, SIGQUIT, SIGTSTP, SIGHUP, SIGWINCH. These | |
899 | functions are the actual signal handlers associated to the signals | |
900 | via calls to signal(). The only job for these functions is to | |
901 | enqueue the appropriate event/procedure with the event loop. Such | |
902 | procedures are the old signal handlers. The event loop will take | |
903 | care of invoking the queued procedures to perform the usual tasks | |
904 | associated with the reception of the signal. */ | |
392a587b | 905 | /* NOTE: 1999-04-30 This is the asynchronous version of init_signals. |
b5a0ac70 SS |
906 | init_signals will become obsolete as we move to have to event loop |
907 | as the default for gdb. */ | |
908 | void | |
c2c6d25f | 909 | async_init_signals (void) |
c5aa993b | 910 | { |
b5a0ac70 SS |
911 | signal (SIGINT, handle_sigint); |
912 | sigint_token = | |
0f71a2f6 | 913 | create_async_signal_handler (async_request_quit, NULL); |
b5a0ac70 SS |
914 | |
915 | /* If SIGTRAP was set to SIG_IGN, then the SIG_IGN will get passed | |
916 | to the inferior and breakpoints will be ignored. */ | |
917 | #ifdef SIGTRAP | |
918 | signal (SIGTRAP, SIG_DFL); | |
919 | #endif | |
920 | ||
921 | /* If we initialize SIGQUIT to SIG_IGN, then the SIG_IGN will get | |
922 | passed to the inferior, which we don't want. It would be | |
923 | possible to do a "signal (SIGQUIT, SIG_DFL)" after we fork, but | |
924 | on BSD4.3 systems using vfork, that can affect the | |
925 | GDB process as well as the inferior (the signal handling tables | |
926 | might be in memory, shared between the two). Since we establish | |
927 | a handler for SIGQUIT, when we call exec it will set the signal | |
928 | to SIG_DFL for us. */ | |
929 | signal (SIGQUIT, handle_sigquit); | |
930 | sigquit_token = | |
0f71a2f6 | 931 | create_async_signal_handler (async_do_nothing, NULL); |
b5a0ac70 SS |
932 | #ifdef SIGHUP |
933 | if (signal (SIGHUP, handle_sighup) != SIG_IGN) | |
934 | sighup_token = | |
0f71a2f6 | 935 | create_async_signal_handler (async_disconnect, NULL); |
b5a0ac70 SS |
936 | else |
937 | sighup_token = | |
0f71a2f6 | 938 | create_async_signal_handler (async_do_nothing, NULL); |
b5a0ac70 SS |
939 | #endif |
940 | signal (SIGFPE, handle_sigfpe); | |
941 | sigfpe_token = | |
0f71a2f6 | 942 | create_async_signal_handler (async_float_handler, NULL); |
b5a0ac70 SS |
943 | |
944 | #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER) | |
945 | signal (SIGWINCH, handle_sigwinch); | |
946 | sigwinch_token = | |
0f71a2f6 | 947 | create_async_signal_handler (SIGWINCH_HANDLER, NULL); |
b5a0ac70 | 948 | #endif |
0f71a2f6 JM |
949 | #ifdef STOP_SIGNAL |
950 | sigtstp_token = | |
951 | create_async_signal_handler (async_stop_sig, NULL); | |
952 | #endif | |
953 | ||
954 | } | |
955 | ||
c5aa993b | 956 | void |
97bb9d91 | 957 | mark_async_signal_handler_wrapper (void *token) |
0f71a2f6 | 958 | { |
c2c6d25f | 959 | mark_async_signal_handler ((struct async_signal_handler *) token); |
b5a0ac70 SS |
960 | } |
961 | ||
962 | /* Tell the event loop what to do if SIGINT is received. | |
963 | See event-signal.c. */ | |
c5aa993b | 964 | void |
c2c6d25f | 965 | handle_sigint (int sig) |
b5a0ac70 SS |
966 | { |
967 | signal (sig, handle_sigint); | |
968 | ||
969 | /* If immediate_quit is set, we go ahead and process the SIGINT right | |
970 | away, even if we usually would defer this to the event loop. The | |
971 | assumption here is that it is safe to process ^C immediately if | |
972 | immediate_quit is set. If we didn't, SIGINT would be really | |
973 | processed only the next time through the event loop. To get to | |
974 | that point, though, the command that we want to interrupt needs to | |
975 | finish first, which is unacceptable. */ | |
976 | if (immediate_quit) | |
0f71a2f6 | 977 | async_request_quit (0); |
b5a0ac70 SS |
978 | else |
979 | /* If immediate quit is not set, we process SIGINT the next time | |
980 | through the loop, which is fine. */ | |
0f71a2f6 | 981 | mark_async_signal_handler_wrapper (sigint_token); |
b5a0ac70 SS |
982 | } |
983 | ||
984 | /* Do the quit. All the checks have been done by the caller. */ | |
c5aa993b | 985 | void |
c2c6d25f | 986 | async_request_quit (gdb_client_data arg) |
b5a0ac70 SS |
987 | { |
988 | quit_flag = 1; | |
989 | #ifdef REQUEST_QUIT | |
990 | REQUEST_QUIT; | |
991 | #else | |
992 | quit (); | |
993 | #endif | |
994 | } | |
995 | ||
996 | /* Tell the event loop what to do if SIGQUIT is received. | |
997 | See event-signal.c. */ | |
c5aa993b | 998 | static void |
c2c6d25f | 999 | handle_sigquit (int sig) |
b5a0ac70 | 1000 | { |
0f71a2f6 | 1001 | mark_async_signal_handler_wrapper (sigquit_token); |
b5a0ac70 SS |
1002 | signal (sig, handle_sigquit); |
1003 | } | |
1004 | ||
1005 | /* Called by the event loop in response to a SIGQUIT. */ | |
c5aa993b | 1006 | static void |
c2c6d25f | 1007 | async_do_nothing (gdb_client_data arg) |
b5a0ac70 SS |
1008 | { |
1009 | /* Empty function body. */ | |
1010 | } | |
1011 | ||
1012 | #ifdef SIGHUP | |
1013 | /* Tell the event loop what to do if SIGHUP is received. | |
1014 | See event-signal.c. */ | |
c5aa993b | 1015 | static void |
fba45db2 | 1016 | handle_sighup (int sig) |
b5a0ac70 | 1017 | { |
0f71a2f6 | 1018 | mark_async_signal_handler_wrapper (sighup_token); |
b5a0ac70 SS |
1019 | signal (sig, handle_sighup); |
1020 | } | |
1021 | ||
0f71a2f6 | 1022 | /* Called by the event loop to process a SIGHUP */ |
c5aa993b | 1023 | static void |
c2c6d25f | 1024 | async_disconnect (gdb_client_data arg) |
b5a0ac70 SS |
1025 | { |
1026 | catch_errors (quit_cover, NULL, | |
1027 | "Could not kill the program being debugged", | |
1028 | RETURN_MASK_ALL); | |
1029 | signal (SIGHUP, SIG_DFL); /*FIXME: ??????????? */ | |
1030 | kill (getpid (), SIGHUP); | |
1031 | } | |
1032 | #endif | |
1033 | ||
0f71a2f6 | 1034 | #ifdef STOP_SIGNAL |
c5aa993b | 1035 | void |
c2c6d25f | 1036 | handle_stop_sig (int sig) |
0f71a2f6 | 1037 | { |
c5aa993b JM |
1038 | mark_async_signal_handler_wrapper (sigtstp_token); |
1039 | signal (sig, handle_stop_sig); | |
0f71a2f6 JM |
1040 | } |
1041 | ||
1042 | static void | |
c2c6d25f | 1043 | async_stop_sig (gdb_client_data arg) |
0f71a2f6 | 1044 | { |
c5aa993b | 1045 | char *prompt = get_prompt (); |
0f71a2f6 JM |
1046 | #if STOP_SIGNAL == SIGTSTP |
1047 | signal (SIGTSTP, SIG_DFL); | |
2acceee2 JM |
1048 | #if HAVE_SIGPROCMASK |
1049 | { | |
1050 | sigset_t zero; | |
46711df8 | 1051 | |
2acceee2 JM |
1052 | sigemptyset (&zero); |
1053 | sigprocmask (SIG_SETMASK, &zero, 0); | |
1054 | } | |
46711df8 | 1055 | #elif HAVE_SIGSETMASK |
0f71a2f6 | 1056 | sigsetmask (0); |
2acceee2 | 1057 | #endif |
0f71a2f6 JM |
1058 | kill (getpid (), SIGTSTP); |
1059 | signal (SIGTSTP, handle_stop_sig); | |
1060 | #else | |
1061 | signal (STOP_SIGNAL, handle_stop_sig); | |
1062 | #endif | |
1063 | printf_unfiltered ("%s", prompt); | |
1064 | gdb_flush (gdb_stdout); | |
1065 | ||
1066 | /* Forget about any previous command -- null line now will do nothing. */ | |
1067 | dont_repeat (); | |
1068 | } | |
1069 | #endif /* STOP_SIGNAL */ | |
1070 | ||
b5a0ac70 SS |
1071 | /* Tell the event loop what to do if SIGFPE is received. |
1072 | See event-signal.c. */ | |
c5aa993b | 1073 | static void |
c2c6d25f | 1074 | handle_sigfpe (int sig) |
b5a0ac70 | 1075 | { |
0f71a2f6 | 1076 | mark_async_signal_handler_wrapper (sigfpe_token); |
b5a0ac70 SS |
1077 | signal (sig, handle_sigfpe); |
1078 | } | |
1079 | ||
1080 | /* Event loop will call this functin to process a SIGFPE. */ | |
c5aa993b | 1081 | static void |
c2c6d25f | 1082 | async_float_handler (gdb_client_data arg) |
b5a0ac70 SS |
1083 | { |
1084 | /* This message is based on ANSI C, section 4.7. Note that integer | |
1085 | divide by zero causes this, so "float" is a misnomer. */ | |
1086 | error ("Erroneous arithmetic operation."); | |
1087 | } | |
1088 | ||
1089 | /* Tell the event loop what to do if SIGWINCH is received. | |
1090 | See event-signal.c. */ | |
1091 | #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER) | |
c5aa993b | 1092 | static void |
c2c6d25f | 1093 | handle_sigwinch (int sig) |
b5a0ac70 | 1094 | { |
0f71a2f6 | 1095 | mark_async_signal_handler_wrapper (sigwinch_token); |
b5a0ac70 SS |
1096 | signal (sig, handle_sigwinch); |
1097 | } | |
1098 | #endif | |
1099 | \f | |
1100 | ||
1101 | /* Called by do_setshow_command. */ | |
1102 | /* ARGSUSED */ | |
1103 | void | |
c2c6d25f | 1104 | set_async_editing_command (char *args, int from_tty, struct cmd_list_element *c) |
b5a0ac70 SS |
1105 | { |
1106 | change_line_handler (); | |
1107 | } | |
1108 | ||
1109 | /* Called by do_setshow_command. */ | |
1110 | /* ARGSUSED */ | |
1111 | void | |
c2c6d25f | 1112 | set_async_annotation_level (char *args, int from_tty, struct cmd_list_element *c) |
b5a0ac70 SS |
1113 | { |
1114 | change_annotation_level (); | |
1115 | } | |
1116 | ||
1117 | /* Called by do_setshow_command. */ | |
1118 | /* ARGSUSED */ | |
1119 | void | |
c2c6d25f | 1120 | set_async_prompt (char *args, int from_tty, struct cmd_list_element *c) |
b5a0ac70 SS |
1121 | { |
1122 | PROMPT (0) = savestring (new_async_prompt, strlen (new_async_prompt)); | |
1123 | } | |
1124 | ||
0f71a2f6 JM |
1125 | /* Set things up for readline to be invoked via the alternate |
1126 | interface, i.e. via a callback function (rl_callback_read_char), | |
c5aa993b | 1127 | and hook up instream to the event loop. */ |
0f71a2f6 | 1128 | void |
c2c6d25f | 1129 | _initialize_event_loop (void) |
0f71a2f6 | 1130 | { |
6426a772 | 1131 | if (event_loop_p) |
9e0b60a8 | 1132 | { |
c5201926 EZ |
1133 | /* If the input stream is connected to a terminal, turn on |
1134 | editing. */ | |
1135 | if (ISATTY (instream)) | |
1136 | { | |
1137 | /* Tell gdb that we will be using the readline library. This | |
1138 | could be overwritten by a command in .gdbinit like 'set | |
1139 | editing on' or 'off'. */ | |
1140 | async_command_editing_p = 1; | |
1141 | ||
1142 | /* When a character is detected on instream by select or | |
1143 | poll, readline will be invoked via this callback | |
1144 | function. */ | |
1145 | call_readline = rl_callback_read_char_wrapper; | |
1146 | } | |
1147 | else | |
1148 | { | |
1149 | async_command_editing_p = 0; | |
1150 | call_readline = gdb_readline2; | |
1151 | } | |
9e0b60a8 JM |
1152 | |
1153 | /* When readline has read an end-of-line character, it passes | |
c5aa993b JM |
1154 | the complete line to gdb for processing. command_line_handler |
1155 | is the function that does this. */ | |
9e0b60a8 JM |
1156 | input_handler = command_line_handler; |
1157 | ||
1158 | /* Tell readline to use the same input stream that gdb uses. */ | |
1159 | rl_instream = instream; | |
1160 | ||
1161 | /* Get a file descriptor for the input stream, so that we can | |
085dd6e6 | 1162 | register it with the event loop. */ |
9e0b60a8 JM |
1163 | input_fd = fileno (instream); |
1164 | ||
085dd6e6 JM |
1165 | /* Tell gdb to use the cli_command_loop as the main loop. */ |
1166 | command_loop_hook = cli_command_loop; | |
1167 | ||
9e0b60a8 JM |
1168 | /* Now we need to create the event sources for the input file |
1169 | descriptor. */ | |
1170 | /* At this point in time, this is the only event source that we | |
c5aa993b JM |
1171 | register with the even loop. Another source is going to be |
1172 | the target program (inferior), but that must be registered | |
1173 | only when it actually exists (I.e. after we say 'run' or | |
1174 | after we connect to a remote target. */ | |
c2c6d25f | 1175 | add_file_handler (input_fd, stdin_event_handler, 0); |
9e0b60a8 | 1176 | } |
0f71a2f6 | 1177 | } |