1 /* Top level stuff for GDB, the GNU debugger.
2 Copyright 1999, 2000, 2001, 2002, 2004 Free Software Foundation, Inc.
3 Written by Elena Zannoni <ezannoni@cygnus.com> of Cygnus Solutions.
5 This file is part of GDB.
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.
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.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
26 #include "terminal.h" /* for job_control */
27 #include "event-loop.h"
28 #include "event-top.h"
31 #include "exceptions.h"
33 /* For dont_repeat() */
36 /* readline include files */
37 #include "readline/readline.h"
38 #include "readline/history.h"
40 /* readline defines this. */
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 static void async_do_nothing (gdb_client_data arg
);
50 static void async_disconnect (gdb_client_data arg
);
51 static void async_stop_sig (gdb_client_data arg
);
52 static void async_float_handler (gdb_client_data arg
);
54 /* Signal handlers. */
55 static void handle_sigquit (int sig
);
56 static void handle_sighup (int sig
);
57 static void handle_sigfpe (int sig
);
58 #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER)
59 static void handle_sigwinch (int sig
);
62 /* Functions to be invoked by the event loop in response to
64 static void async_do_nothing (gdb_client_data
);
65 static void async_disconnect (gdb_client_data
);
66 static void async_float_handler (gdb_client_data
);
67 static void async_stop_sig (gdb_client_data
);
69 /* Readline offers an alternate interface, via callback
70 functions. These are all included in the file callback.c in the
71 readline distribution. This file provides (mainly) a function, which
72 the event loop uses as callback (i.e. event handler) whenever an event
73 is detected on the standard input file descriptor.
74 readline_callback_read_char is called (by the GDB event loop) whenever
75 there is a new character ready on the input stream. This function
76 incrementally builds a buffer internal to readline where it
77 accumulates the line read up to the point of invocation. In the
78 special case in which the character read is newline, the function
79 invokes a GDB supplied callback routine, which does the processing of
80 a full command line. This latter routine is the asynchronous analog
81 of the old command_line_input in gdb. Instead of invoking (and waiting
82 for) readline to read the command line and pass it back to
83 command_loop for processing, the new command_line_handler function has
84 the command line already available as its parameter. INPUT_HANDLER is
85 to be set to the function that readline will invoke when a complete
86 line of input is ready. CALL_READLINE is to be set to the function
87 that readline offers as callback to the event_loop. */
89 void (*input_handler
) (char *);
90 void (*call_readline
) (gdb_client_data
);
92 /* Important variables for the event loop. */
94 /* This is used to determine if GDB is using the readline library or
95 its own simplified form of readline. It is used by the asynchronous
96 form of the set editing command.
97 ezannoni: as of 1999-04-29 I expect that this
98 variable will not be used after gdb is changed to use the event
99 loop as default engine, and event-top.c is merged into top.c. */
100 int async_command_editing_p
;
102 /* This variable contains the new prompt that the user sets with the
103 set prompt command. */
104 char *new_async_prompt
;
106 /* This is the annotation suffix that will be used when the
107 annotation_level is 2. */
108 char *async_annotation_suffix
;
110 /* This is used to display the notification of the completion of an
111 asynchronous execution command. */
112 int exec_done_display_p
= 0;
114 /* This is the file descriptor for the input stream that GDB uses to
115 read commands from. */
118 /* This is the prompt stack. Prompts will be pushed on the stack as
119 needed by the different 'kinds' of user inputs GDB is asking
120 for. See event-loop.h. */
121 struct prompts the_prompts
;
123 /* signal handling variables */
124 /* Each of these is a pointer to a function that the event loop will
125 invoke if the corresponding signal has received. The real signal
126 handlers mark these functions as ready to be executed and the event
127 loop, in a later iteration, calls them. See the function
128 invoke_async_signal_handler. */
135 #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER)
136 void *sigwinch_token
;
142 /* Structure to save a partially entered command. This is used when
143 the user types '\' at the end of a command line. This is necessary
144 because each line of input is handled by a different call to
145 command_line_handler, and normally there is no state retained
146 between different calls. */
147 int more_to_come
= 0;
149 struct readline_input_state
152 char *linebuffer_ptr
;
154 readline_input_state
;
156 /* This hook is called by rl_callback_read_char_wrapper after each
157 character is processed. */
158 void (*after_char_processing_hook
) ();
161 /* Wrapper function for calling into the readline library. The event
162 loop expects the callback function to have a paramter, while readline
165 rl_callback_read_char_wrapper (gdb_client_data client_data
)
167 rl_callback_read_char ();
168 if (after_char_processing_hook
)
169 (*after_char_processing_hook
) ();
172 /* Initialize all the necessary variables, start the event loop,
173 register readline, and stdin, start the loop. */
175 cli_command_loop (void)
179 char *gdb_prompt
= get_prompt ();
181 /* If we are using readline, set things up and display the first
182 prompt, otherwise just print the prompt. */
183 if (async_command_editing_p
)
185 /* Tell readline what the prompt to display is and what function it
186 will need to call after a whole line is read. This also displays
188 length
= strlen (PREFIX (0)) + strlen (gdb_prompt
) + strlen (SUFFIX (0)) + 1;
189 a_prompt
= (char *) xmalloc (length
);
190 strcpy (a_prompt
, PREFIX (0));
191 strcat (a_prompt
, gdb_prompt
);
192 strcat (a_prompt
, SUFFIX (0));
193 rl_callback_handler_install (a_prompt
, input_handler
);
196 display_gdb_prompt (0);
198 /* Now it's time to start the event loop. */
202 /* Change the function to be invoked every time there is a character
203 ready on stdin. This is used when the user sets the editing off,
204 therefore bypassing readline, and letting gdb handle the input
205 itself, via gdb_readline2. Also it is used in the opposite case in
206 which the user sets editing on again, by restoring readline
207 handling of the input. */
209 change_line_handler (void)
211 /* NOTE: this operates on input_fd, not instream. If we are reading
212 commands from a file, instream will point to the file. However in
213 async mode, we always read commands from a file with editing
214 off. This means that the 'set editing on/off' will have effect
215 only on the interactive session. */
217 if (async_command_editing_p
)
219 /* Turn on editing by using readline. */
220 call_readline
= rl_callback_read_char_wrapper
;
221 input_handler
= command_line_handler
;
225 /* Turn off editing by using gdb_readline2. */
226 rl_callback_handler_remove ();
227 call_readline
= gdb_readline2
;
229 /* Set up the command handler as well, in case we are called as
230 first thing from .gdbinit. */
231 input_handler
= command_line_handler
;
235 /* Displays the prompt. The prompt that is displayed is the current
236 top of the prompt stack, if the argument NEW_PROMPT is
237 0. Otherwise, it displays whatever NEW_PROMPT is. This is used
238 after each gdb command has completed, and in the following cases:
239 1. when the user enters a command line which is ended by '\'
240 indicating that the command will continue on the next line.
241 In that case the prompt that is displayed is the empty string.
242 2. When the user is entering 'commands' for a breakpoint, or
243 actions for a tracepoint. In this case the prompt will be '>'
245 FIXME: 2. & 3. not implemented yet for async. */
247 display_gdb_prompt (char *new_prompt
)
249 int prompt_length
= 0;
250 char *gdb_prompt
= get_prompt ();
252 /* Each interpreter has its own rules on displaying the command
254 if (!current_interp_display_prompt_p ())
257 if (target_executing
&& sync_execution
)
259 /* This is to trick readline into not trying to display the
260 prompt. Even though we display the prompt using this
261 function, readline still tries to do its own display if we
262 don't call rl_callback_handler_install and
263 rl_callback_handler_remove (which readline detects because a
264 global variable is not set). If readline did that, it could
265 mess up gdb signal handlers for SIGINT. Readline assumes
266 that between calls to rl_set_signals and rl_clear_signals gdb
267 doesn't do anything with the signal handlers. Well, that's
268 not the case, because when the target executes we change the
269 SIGINT signal handler. If we allowed readline to display the
270 prompt, the signal handler change would happen exactly
271 between the calls to the above two functions.
272 Calling rl_callback_handler_remove(), does the job. */
274 rl_callback_handler_remove ();
280 /* Just use the top of the prompt stack. */
281 prompt_length
= strlen (PREFIX (0)) +
282 strlen (SUFFIX (0)) +
283 strlen (gdb_prompt
) + 1;
285 new_prompt
= (char *) alloca (prompt_length
);
287 /* Prefix needs to have new line at end. */
288 strcpy (new_prompt
, PREFIX (0));
289 strcat (new_prompt
, gdb_prompt
);
290 /* Suffix needs to have a new line at end and \032 \032 at
292 strcat (new_prompt
, SUFFIX (0));
295 if (async_command_editing_p
)
297 rl_callback_handler_remove ();
298 rl_callback_handler_install (new_prompt
, input_handler
);
300 /* new_prompt at this point can be the top of the stack or the one passed in */
303 /* Don't use a _filtered function here. It causes the assumed
304 character position to be off, since the newline we read from
305 the user is not accounted for. */
306 fputs_unfiltered (new_prompt
, gdb_stdout
);
307 gdb_flush (gdb_stdout
);
311 /* Used when the user requests a different annotation level, with
312 'set annotate'. It pushes a new prompt (with prefix and suffix) on top
313 of the prompt stack, if the annotation level desired is 2, otherwise
314 it pops the top of the prompt stack when we want the annotation level
315 to be the normal ones (1 or 0). */
317 change_annotation_level (void)
319 char *prefix
, *suffix
;
321 if (!PREFIX (0) || !PROMPT (0) || !SUFFIX (0))
323 /* The prompt stack has not been initialized to "", we are
324 using gdb w/o the --async switch */
325 warning ("Command has same effect as set annotate");
329 if (annotation_level
> 1)
331 if (!strcmp (PREFIX (0), "") && !strcmp (SUFFIX (0), ""))
333 /* Push a new prompt if the previous annotation_level was not >1. */
334 prefix
= (char *) alloca (strlen (async_annotation_suffix
) + 10);
335 strcpy (prefix
, "\n\032\032pre-");
336 strcat (prefix
, async_annotation_suffix
);
337 strcat (prefix
, "\n");
339 suffix
= (char *) alloca (strlen (async_annotation_suffix
) + 6);
340 strcpy (suffix
, "\n\032\032");
341 strcat (suffix
, async_annotation_suffix
);
342 strcat (suffix
, "\n");
344 push_prompt (prefix
, (char *) 0, suffix
);
349 if (strcmp (PREFIX (0), "") && strcmp (SUFFIX (0), ""))
351 /* Pop the top of the stack, we are going back to annotation < 1. */
357 /* Pushes a new prompt on the prompt stack. Each prompt has three
358 parts: prefix, prompt, suffix. Usually prefix and suffix are empty
359 strings, except when the annotation level is 2. Memory is allocated
360 within savestring for the new prompt. */
362 push_prompt (char *prefix
, char *prompt
, char *suffix
)
365 PREFIX (0) = savestring (prefix
, strlen (prefix
));
367 /* Note that this function is used by the set annotate 2
368 command. This is why we take care of saving the old prompt
369 in case a new one is not specified. */
371 PROMPT (0) = savestring (prompt
, strlen (prompt
));
373 PROMPT (0) = savestring (PROMPT (-1), strlen (PROMPT (-1)));
375 SUFFIX (0) = savestring (suffix
, strlen (suffix
));
378 /* Pops the top of the prompt stack, and frees the memory allocated for it. */
382 /* If we are not during a 'synchronous' execution command, in which
383 case, the top prompt would be empty. */
384 if (strcmp (PROMPT (0), ""))
385 /* This is for the case in which the prompt is set while the
386 annotation level is 2. The top prompt will be changed, but when
387 we return to annotation level < 2, we want that new prompt to be
388 in effect, until the user does another 'set prompt'. */
389 if (strcmp (PROMPT (0), PROMPT (-1)))
392 PROMPT (-1) = savestring (PROMPT (0), strlen (PROMPT (0)));
401 /* When there is an event ready on the stdin file desriptor, instead
402 of calling readline directly throught the callback function, or
403 instead of calling gdb_readline2, give gdb a chance to detect
404 errors and do something. */
406 stdin_event_handler (int error
, gdb_client_data client_data
)
410 printf_unfiltered ("error detected on stdin\n");
411 delete_file_handler (input_fd
);
412 discard_all_continuations ();
413 /* If stdin died, we may as well kill gdb. */
414 quit_command ((char *) 0, stdin
== instream
);
417 (*call_readline
) (client_data
);
420 /* Re-enable stdin after the end of an execution command in
421 synchronous mode, or after an error from the target, and we aborted
422 the exec operation. */
425 async_enable_stdin (void *dummy
)
427 /* See NOTE in async_disable_stdin() */
428 /* FIXME: cagney/1999-09-27: Call this before clearing
429 sync_execution. Current target_terminal_ours() implementations
430 check for sync_execution before switching the terminal. */
431 target_terminal_ours ();
436 /* Disable reads from stdin (the console) marking the command as
440 async_disable_stdin (void)
443 push_prompt ("", "", "");
444 /* FIXME: cagney/1999-09-27: At present this call is technically
445 redundant since infcmd.c and infrun.c both already call
446 target_terminal_inferior(). As the terminal handling (in
447 sync/async mode) is refined, the duplicate calls can be
448 eliminated (Here or in infcmd.c/infrun.c). */
449 target_terminal_inferior ();
450 /* Add the reinstate of stdin to the list of cleanups to be done
451 in case the target errors out and dies. These cleanups are also
452 done in case of normal successful termination of the execution
453 command, by complete_execution(). */
454 make_exec_error_cleanup (async_enable_stdin
, NULL
);
458 /* Handles a gdb command. This function is called by
459 command_line_handler, which has processed one or more input lines
461 /* NOTE: 1999-04-30 This is the asynchronous version of the command_loop
462 function. The command_loop function will be obsolete when we
463 switch to use the event loop at every execution of gdb. */
465 command_handler (char *command
)
467 struct cleanup
*old_chain
;
468 int stdin_is_tty
= ISATTY (stdin
);
469 struct continuation_arg
*arg1
;
470 struct continuation_arg
*arg2
;
471 long time_at_cmd_start
;
473 long space_at_cmd_start
= 0;
475 extern int display_time
;
476 extern int display_space
;
479 if (instream
== stdin
&& stdin_is_tty
)
480 reinitialize_more_filter ();
481 old_chain
= make_cleanup (null_cleanup
, 0);
483 /* If readline returned a NULL command, it means that the
484 connection with the terminal is gone. This happens at the
485 end of a testsuite run, after Expect has hung up
486 but GDB is still alive. In such a case, we just quit gdb
487 killing the inferior program too. */
489 quit_command ((char *) 0, stdin
== instream
);
491 time_at_cmd_start
= get_run_time ();
496 char *lim
= (char *) sbrk (0);
497 space_at_cmd_start
= lim
- lim_at_start
;
501 execute_command (command
, instream
== stdin
);
503 /* Set things up for this function to be compete later, once the
504 execution has completed, if we are doing an execution command,
505 otherwise, just go ahead and finish. */
506 if (target_can_async_p () && target_executing
)
509 (struct continuation_arg
*) xmalloc (sizeof (struct continuation_arg
));
511 (struct continuation_arg
*) xmalloc (sizeof (struct continuation_arg
));
514 arg1
->data
.longint
= time_at_cmd_start
;
516 arg2
->data
.longint
= space_at_cmd_start
;
518 add_continuation (command_line_handler_continuation
, arg1
);
521 /* Do any commands attached to breakpoint we stopped at. Only if we
522 are always running synchronously. Or if we have just executed a
523 command that doesn't start the target. */
524 if (!target_can_async_p () || !target_executing
)
526 bpstat_do_actions (&stop_bpstat
);
527 do_cleanups (old_chain
);
531 long cmd_time
= get_run_time () - time_at_cmd_start
;
533 printf_unfiltered ("Command execution time: %ld.%06ld\n",
534 cmd_time
/ 1000000, cmd_time
% 1000000);
540 char *lim
= (char *) sbrk (0);
541 long space_now
= lim
- lim_at_start
;
542 long space_diff
= space_now
- space_at_cmd_start
;
544 printf_unfiltered ("Space used: %ld (%c%ld for this command)\n",
546 (space_diff
>= 0 ? '+' : '-'),
553 /* Do any commands attached to breakpoint we stopped at. Only if we
554 are always running synchronously. Or if we have just executed a
555 command that doesn't start the target. */
557 command_line_handler_continuation (struct continuation_arg
*arg
)
559 extern int display_time
;
560 extern int display_space
;
562 long time_at_cmd_start
= arg
->data
.longint
;
563 long space_at_cmd_start
= arg
->next
->data
.longint
;
565 bpstat_do_actions (&stop_bpstat
);
566 /*do_cleanups (old_chain); *//*?????FIXME????? */
570 long cmd_time
= get_run_time () - time_at_cmd_start
;
572 printf_unfiltered ("Command execution time: %ld.%06ld\n",
573 cmd_time
/ 1000000, cmd_time
% 1000000);
578 char *lim
= (char *) sbrk (0);
579 long space_now
= lim
- lim_at_start
;
580 long space_diff
= space_now
- space_at_cmd_start
;
582 printf_unfiltered ("Space used: %ld (%c%ld for this command)\n",
584 (space_diff
>= 0 ? '+' : '-'),
590 /* Handle a complete line of input. This is called by the callback
591 mechanism within the readline library. Deal with incomplete commands
592 as well, by saving the partial input in a global buffer. */
594 /* NOTE: 1999-04-30 This is the asynchronous version of the
595 command_line_input function. command_line_input will become
596 obsolete once we use the event loop as the default mechanism in
599 command_line_handler (char *rl
)
601 static char *linebuffer
= 0;
602 static unsigned linelength
= 0;
611 int repeat
= (instream
== stdin
);
613 if (annotation_level
> 1 && instream
== stdin
)
615 printf_unfiltered ("\n\032\032post-");
616 puts_unfiltered (async_annotation_suffix
);
617 printf_unfiltered ("\n");
623 linebuffer
= (char *) xmalloc (linelength
);
630 strcpy (linebuffer
, readline_input_state
.linebuffer
);
631 p
= readline_input_state
.linebuffer_ptr
;
632 xfree (readline_input_state
.linebuffer
);
639 signal (STOP_SIGNAL
, handle_stop_sig
);
642 /* Make sure that all output has been output. Some machines may let
643 you get away with leaving out some of the gdb_flush, but not all. */
645 gdb_flush (gdb_stdout
);
646 gdb_flush (gdb_stderr
);
648 if (source_file_name
!= NULL
)
650 ++source_line_number
;
651 sprintf (source_error
,
652 "%s%s:%d: Error in sourced command file:\n",
656 error_pre_print
= source_error
;
659 /* If we are in this case, then command_handler will call quit
660 and exit from gdb. */
661 if (!rl
|| rl
== (char *) EOF
)
666 if (strlen (rl
) + 1 + (p
- linebuffer
) > linelength
)
668 linelength
= strlen (rl
) + 1 + (p
- linebuffer
);
669 nline
= (char *) xrealloc (linebuffer
, linelength
);
670 p
+= nline
- linebuffer
;
674 /* Copy line. Don't copy null at end. (Leaves line alone
675 if this was just a newline) */
679 xfree (rl
); /* Allocated in readline. */
681 if (p
> linebuffer
&& *(p
- 1) == '\\')
683 p
--; /* Put on top of '\'. */
685 readline_input_state
.linebuffer
= savestring (linebuffer
,
686 strlen (linebuffer
));
687 readline_input_state
.linebuffer_ptr
= p
;
689 /* We will not invoke a execute_command if there is more
690 input expected to complete the command. So, we need to
691 print an empty prompt here. */
693 push_prompt ("", "", "");
694 display_gdb_prompt (0);
700 signal (STOP_SIGNAL
, SIG_DFL
);
703 #define SERVER_COMMAND_LENGTH 7
705 (p
- linebuffer
> SERVER_COMMAND_LENGTH
)
706 && strncmp (linebuffer
, "server ", SERVER_COMMAND_LENGTH
) == 0;
709 /* Note that we don't set `line'. Between this and the check in
710 dont_repeat, this insures that repeating will still do the
713 command_handler (linebuffer
+ SERVER_COMMAND_LENGTH
);
714 display_gdb_prompt (0);
718 /* Do history expansion if that is wished. */
719 if (history_expansion_p
&& instream
== stdin
720 && ISATTY (instream
))
725 *p
= '\0'; /* Insert null now. */
726 expanded
= history_expand (linebuffer
, &history_value
);
729 /* Print the changes. */
730 printf_unfiltered ("%s\n", history_value
);
732 /* If there was an error, call this function again. */
735 xfree (history_value
);
738 if (strlen (history_value
) > linelength
)
740 linelength
= strlen (history_value
) + 1;
741 linebuffer
= (char *) xrealloc (linebuffer
, linelength
);
743 strcpy (linebuffer
, history_value
);
744 p
= linebuffer
+ strlen (linebuffer
);
745 xfree (history_value
);
749 /* If we just got an empty line, and that is supposed
750 to repeat the previous command, return the value in the
752 if (repeat
&& p
== linebuffer
&& *p
!= '\\')
754 command_handler (line
);
755 display_gdb_prompt (0);
759 for (p1
= linebuffer
; *p1
== ' ' || *p1
== '\t'; p1
++);
762 command_handler (line
);
763 display_gdb_prompt (0);
769 /* Add line to history if appropriate. */
770 if (instream
== stdin
771 && ISATTY (stdin
) && *linebuffer
)
772 add_history (linebuffer
);
774 /* Note: lines consisting solely of comments are added to the command
775 history. This is useful when you type a command, and then
776 realize you don't want to execute it quite yet. You can comment
777 out the command and then later fetch it from the value history
778 and remove the '#'. The kill ring is probably better, but some
779 people are in the habit of commenting things out. */
781 *p1
= '\0'; /* Found a comment. */
783 /* Save into global buffer if appropriate. */
786 if (linelength
> linesize
)
788 line
= xrealloc (line
, linelength
);
789 linesize
= linelength
;
791 strcpy (line
, linebuffer
);
794 command_handler (line
);
795 display_gdb_prompt (0);
800 command_handler (linebuffer
);
801 display_gdb_prompt (0);
805 /* Does reading of input from terminal w/o the editing features
806 provided by the readline library. */
808 /* NOTE: 1999-04-30 Asynchronous version of gdb_readline. gdb_readline
809 will become obsolete when the event loop is made the default
810 execution for gdb. */
812 gdb_readline2 (gdb_client_data client_data
)
817 int result_size
= 80;
818 static int done_once
= 0;
820 /* Unbuffer the input stream, so that, later on, the calls to fgetc
821 fetch only one char at the time from the stream. The fgetc's will
822 get up to the first newline, but there may be more chars in the
823 stream after '\n'. If we buffer the input and fgetc drains the
824 stream, getting stuff beyond the newline as well, a select, done
825 afterwards will not trigger. */
826 if (!done_once
&& !ISATTY (instream
))
828 setbuf (instream
, NULL
);
832 result
= (char *) xmalloc (result_size
);
834 /* We still need the while loop here, even though it would seem
835 obvious to invoke gdb_readline2 at every character entered. If
836 not using the readline library, the terminal is in cooked mode,
837 which sends the characters all at once. Poll will notice that the
838 input fd has changed state only after enter is pressed. At this
839 point we still need to fetch all the chars entered. */
843 /* Read from stdin if we are executing a user defined command.
844 This is the right thing for prompt_for_continue, at least. */
845 c
= fgetc (instream
? instream
: stdin
);
850 /* The last line does not end with a newline. Return it, and
851 if we are called again fgetc will still return EOF and
852 we'll return NULL then. */
855 (*input_handler
) (0);
860 if (input_index
> 0 && result
[input_index
- 1] == '\r')
865 result
[input_index
++] = c
;
866 while (input_index
>= result_size
)
869 result
= (char *) xrealloc (result
, result_size
);
873 result
[input_index
++] = '\0';
874 (*input_handler
) (result
);
878 /* Initialization of signal handlers and tokens. There is a function
879 handle_sig* for each of the signals GDB cares about. Specifically:
880 SIGINT, SIGFPE, SIGQUIT, SIGTSTP, SIGHUP, SIGWINCH. These
881 functions are the actual signal handlers associated to the signals
882 via calls to signal(). The only job for these functions is to
883 enqueue the appropriate event/procedure with the event loop. Such
884 procedures are the old signal handlers. The event loop will take
885 care of invoking the queued procedures to perform the usual tasks
886 associated with the reception of the signal. */
887 /* NOTE: 1999-04-30 This is the asynchronous version of init_signals.
888 init_signals will become obsolete as we move to have to event loop
889 as the default for gdb. */
891 async_init_signals (void)
893 signal (SIGINT
, handle_sigint
);
895 create_async_signal_handler (async_request_quit
, NULL
);
897 /* If SIGTRAP was set to SIG_IGN, then the SIG_IGN will get passed
898 to the inferior and breakpoints will be ignored. */
900 signal (SIGTRAP
, SIG_DFL
);
903 /* If we initialize SIGQUIT to SIG_IGN, then the SIG_IGN will get
904 passed to the inferior, which we don't want. It would be
905 possible to do a "signal (SIGQUIT, SIG_DFL)" after we fork, but
906 on BSD4.3 systems using vfork, that can affect the
907 GDB process as well as the inferior (the signal handling tables
908 might be in memory, shared between the two). Since we establish
909 a handler for SIGQUIT, when we call exec it will set the signal
910 to SIG_DFL for us. */
911 signal (SIGQUIT
, handle_sigquit
);
913 create_async_signal_handler (async_do_nothing
, NULL
);
915 if (signal (SIGHUP
, handle_sighup
) != SIG_IGN
)
917 create_async_signal_handler (async_disconnect
, NULL
);
920 create_async_signal_handler (async_do_nothing
, NULL
);
922 signal (SIGFPE
, handle_sigfpe
);
924 create_async_signal_handler (async_float_handler
, NULL
);
926 #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER)
927 signal (SIGWINCH
, handle_sigwinch
);
929 create_async_signal_handler (SIGWINCH_HANDLER
, NULL
);
933 create_async_signal_handler (async_stop_sig
, NULL
);
939 mark_async_signal_handler_wrapper (void *token
)
941 mark_async_signal_handler ((struct async_signal_handler
*) token
);
944 /* Tell the event loop what to do if SIGINT is received.
945 See event-signal.c. */
947 handle_sigint (int sig
)
949 signal (sig
, handle_sigint
);
951 /* If immediate_quit is set, we go ahead and process the SIGINT right
952 away, even if we usually would defer this to the event loop. The
953 assumption here is that it is safe to process ^C immediately if
954 immediate_quit is set. If we didn't, SIGINT would be really
955 processed only the next time through the event loop. To get to
956 that point, though, the command that we want to interrupt needs to
957 finish first, which is unacceptable. */
959 async_request_quit (0);
961 /* If immediate quit is not set, we process SIGINT the next time
962 through the loop, which is fine. */
963 mark_async_signal_handler_wrapper (sigint_token
);
966 /* Do the quit. All the checks have been done by the caller. */
968 async_request_quit (gdb_client_data arg
)
974 /* Tell the event loop what to do if SIGQUIT is received.
975 See event-signal.c. */
977 handle_sigquit (int sig
)
979 mark_async_signal_handler_wrapper (sigquit_token
);
980 signal (sig
, handle_sigquit
);
983 /* Called by the event loop in response to a SIGQUIT. */
985 async_do_nothing (gdb_client_data arg
)
987 /* Empty function body. */
991 /* Tell the event loop what to do if SIGHUP is received.
992 See event-signal.c. */
994 handle_sighup (int sig
)
996 mark_async_signal_handler_wrapper (sighup_token
);
997 signal (sig
, handle_sighup
);
1000 /* Called by the event loop to process a SIGHUP */
1002 async_disconnect (gdb_client_data arg
)
1004 catch_errors (quit_cover
, NULL
,
1005 "Could not kill the program being debugged",
1007 signal (SIGHUP
, SIG_DFL
); /*FIXME: ??????????? */
1008 kill (getpid (), SIGHUP
);
1014 handle_stop_sig (int sig
)
1016 mark_async_signal_handler_wrapper (sigtstp_token
);
1017 signal (sig
, handle_stop_sig
);
1021 async_stop_sig (gdb_client_data arg
)
1023 char *prompt
= get_prompt ();
1024 #if STOP_SIGNAL == SIGTSTP
1025 signal (SIGTSTP
, SIG_DFL
);
1026 #if HAVE_SIGPROCMASK
1030 sigemptyset (&zero
);
1031 sigprocmask (SIG_SETMASK
, &zero
, 0);
1033 #elif HAVE_SIGSETMASK
1036 kill (getpid (), SIGTSTP
);
1037 signal (SIGTSTP
, handle_stop_sig
);
1039 signal (STOP_SIGNAL
, handle_stop_sig
);
1041 printf_unfiltered ("%s", prompt
);
1042 gdb_flush (gdb_stdout
);
1044 /* Forget about any previous command -- null line now will do nothing. */
1047 #endif /* STOP_SIGNAL */
1049 /* Tell the event loop what to do if SIGFPE is received.
1050 See event-signal.c. */
1052 handle_sigfpe (int sig
)
1054 mark_async_signal_handler_wrapper (sigfpe_token
);
1055 signal (sig
, handle_sigfpe
);
1058 /* Event loop will call this functin to process a SIGFPE. */
1060 async_float_handler (gdb_client_data arg
)
1062 /* This message is based on ANSI C, section 4.7. Note that integer
1063 divide by zero causes this, so "float" is a misnomer. */
1064 error ("Erroneous arithmetic operation.");
1067 /* Tell the event loop what to do if SIGWINCH is received.
1068 See event-signal.c. */
1069 #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER)
1071 handle_sigwinch (int sig
)
1073 mark_async_signal_handler_wrapper (sigwinch_token
);
1074 signal (sig
, handle_sigwinch
);
1079 /* Called by do_setshow_command. */
1081 set_async_editing_command (char *args
, int from_tty
, struct cmd_list_element
*c
)
1083 change_line_handler ();
1086 /* Called by do_setshow_command. */
1088 set_async_annotation_level (char *args
, int from_tty
, struct cmd_list_element
*c
)
1090 change_annotation_level ();
1093 /* Called by do_setshow_command. */
1095 set_async_prompt (char *args
, int from_tty
, struct cmd_list_element
*c
)
1097 PROMPT (0) = savestring (new_async_prompt
, strlen (new_async_prompt
));
1100 /* Set things up for readline to be invoked via the alternate
1101 interface, i.e. via a callback function (rl_callback_read_char),
1102 and hook up instream to the event loop. */
1104 gdb_setup_readline (void)
1106 /* This function is a noop for the sync case. The assumption is
1107 that the sync setup is ALL done in gdb_init, and we would only
1108 mess it up here. The sync stuff should really go away over
1111 gdb_stdout
= stdio_fileopen (stdout
);
1112 gdb_stderr
= stdio_fileopen (stderr
);
1113 gdb_stdlog
= gdb_stderr
; /* for moment */
1114 gdb_stdtarg
= gdb_stderr
; /* for moment */
1116 /* If the input stream is connected to a terminal, turn on
1118 if (ISATTY (instream
))
1120 /* Tell gdb that we will be using the readline library. This
1121 could be overwritten by a command in .gdbinit like 'set
1122 editing on' or 'off'. */
1123 async_command_editing_p
= 1;
1125 /* When a character is detected on instream by select or poll,
1126 readline will be invoked via this callback function. */
1127 call_readline
= rl_callback_read_char_wrapper
;
1131 async_command_editing_p
= 0;
1132 call_readline
= gdb_readline2
;
1135 /* When readline has read an end-of-line character, it passes the
1136 complete line to gdb for processing. command_line_handler is the
1137 function that does this. */
1138 input_handler
= command_line_handler
;
1140 /* Tell readline to use the same input stream that gdb uses. */
1141 rl_instream
= instream
;
1143 /* Get a file descriptor for the input stream, so that we can
1144 register it with the event loop. */
1145 input_fd
= fileno (instream
);
1147 /* Now we need to create the event sources for the input file
1149 /* At this point in time, this is the only event source that we
1150 register with the even loop. Another source is going to be the
1151 target program (inferior), but that must be registered only when
1152 it actually exists (I.e. after we say 'run' or after we connect
1153 to a remote target. */
1154 add_file_handler (input_fd
, stdin_event_handler
, 0);
1157 /* Disable command input through the standard CLI channels. Used in
1158 the suspend proc for interpreters that use the standard gdb readline
1159 interface, like the cli & the mi. */
1161 gdb_disable_readline (void)
1163 /* FIXME - It is too heavyweight to delete and remake these every
1164 time you run an interpreter that needs readline. It is probably
1165 better to have the interpreters cache these, which in turn means
1166 that this needs to be moved into interpreter specific code. */
1169 ui_file_delete (gdb_stdout
);
1170 ui_file_delete (gdb_stderr
);
1175 rl_callback_handler_remove ();
1176 delete_file_handler (input_fd
);