1 /* Top level stuff for GDB, the GNU debugger.
2 Copyright 1999, 2000, 2001, 2002 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"
32 /* For dont_repeat() */
35 /* readline include files */
36 #include <readline/readline.h>
37 #include <readline/history.h>
39 /* readline defines this. */
42 extern void _initialize_event_loop (void);
44 static void rl_callback_read_char_wrapper (gdb_client_data client_data
);
45 static void command_line_handler (char *rl
);
46 static void command_line_handler_continuation (struct continuation_arg
*arg
);
47 static void change_line_handler (void);
48 static void change_annotation_level (void);
49 static void command_handler (char *command
);
50 void cli_command_loop (void);
51 static void async_do_nothing (gdb_client_data arg
);
52 static void async_disconnect (gdb_client_data arg
);
53 static void async_stop_sig (gdb_client_data arg
);
54 static void async_float_handler (gdb_client_data arg
);
56 /* Signal handlers. */
57 static void handle_sigquit (int sig
);
58 static void handle_sighup (int sig
);
59 static void handle_sigfpe (int sig
);
60 #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER)
61 static void handle_sigwinch (int sig
);
64 /* Functions to be invoked by the event loop in response to
66 static void async_do_nothing (gdb_client_data
);
67 static void async_disconnect (gdb_client_data
);
68 static void async_float_handler (gdb_client_data
);
69 static void async_stop_sig (gdb_client_data
);
71 /* Readline offers an alternate interface, via callback
72 functions. These are all included in the file callback.c in the
73 readline distribution. This file provides (mainly) a function, which
74 the event loop uses as callback (i.e. event handler) whenever an event
75 is detected on the standard input file descriptor.
76 readline_callback_read_char is called (by the GDB event loop) whenever
77 there is a new character ready on the input stream. This function
78 incrementally builds a buffer internal to readline where it
79 accumulates the line read up to the point of invocation. In the
80 special case in which the character read is newline, the function
81 invokes a GDB supplied callback routine, which does the processing of
82 a full command line. This latter routine is the asynchronous analog
83 of the old command_line_input in gdb. Instead of invoking (and waiting
84 for) readline to read the command line and pass it back to
85 command_loop for processing, the new command_line_handler function has
86 the command line already available as its parameter. INPUT_HANDLER is
87 to be set to the function that readline will invoke when a complete
88 line of input is ready. CALL_READLINE is to be set to the function
89 that readline offers as callback to the event_loop. */
91 void (*input_handler
) (char *);
92 void (*call_readline
) (gdb_client_data
);
94 /* Important variables for the event loop. */
96 /* This is used to determine if GDB is using the readline library or
97 its own simplified form of readline. It is used by the asynchronous
98 form of the set editing command.
99 ezannoni: as of 1999-04-29 I expect that this
100 variable will not be used after gdb is changed to use the event
101 loop as default engine, and event-top.c is merged into top.c. */
102 int async_command_editing_p
;
104 /* This variable contains the new prompt that the user sets with the
105 set prompt command. */
106 char *new_async_prompt
;
108 /* This is the annotation suffix that will be used when the
109 annotation_level is 2. */
110 char *async_annotation_suffix
;
112 /* This is used to display the notification of the completion of an
113 asynchronous execution command. */
114 int exec_done_display_p
= 0;
116 /* This is the file descriptor for the input stream that GDB uses to
117 read commands from. */
120 /* This is the prompt stack. Prompts will be pushed on the stack as
121 needed by the different 'kinds' of user inputs GDB is asking
122 for. See event-loop.h. */
123 struct prompts the_prompts
;
125 /* signal handling variables */
126 /* Each of these is a pointer to a function that the event loop will
127 invoke if the corresponding signal has received. The real signal
128 handlers mark these functions as ready to be executed and the event
129 loop, in a later iteration, calls them. See the function
130 invoke_async_signal_handler. */
137 #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER)
138 void *sigwinch_token
;
144 /* Structure to save a partially entered command. This is used when
145 the user types '\' at the end of a command line. This is necessary
146 because each line of input is handled by a different call to
147 command_line_handler, and normally there is no state retained
148 between different calls. */
149 int more_to_come
= 0;
151 struct readline_input_state
154 char *linebuffer_ptr
;
156 readline_input_state
;
158 /* This hook is called by rl_callback_read_char_wrapper after each
159 character is processed. */
160 void (*after_char_processing_hook
) ();
163 /* Wrapper function for calling into the readline library. The event
164 loop expects the callback function to have a paramter, while readline
167 rl_callback_read_char_wrapper (gdb_client_data client_data
)
169 rl_callback_read_char ();
170 if (after_char_processing_hook
)
171 (*after_char_processing_hook
) ();
174 /* Initialize all the necessary variables, start the event loop,
175 register readline, and stdin, start the loop. */
177 cli_command_loop (void)
181 char *gdb_prompt
= get_prompt ();
183 /* If we are using readline, set things up and display the first
184 prompt, otherwise just print the prompt. */
185 if (async_command_editing_p
)
187 /* Tell readline what the prompt to display is and what function it
188 will need to call after a whole line is read. This also displays
190 length
= strlen (PREFIX (0)) + strlen (gdb_prompt
) + strlen (SUFFIX (0)) + 1;
191 a_prompt
= (char *) xmalloc (length
);
192 strcpy (a_prompt
, PREFIX (0));
193 strcat (a_prompt
, gdb_prompt
);
194 strcat (a_prompt
, SUFFIX (0));
195 rl_callback_handler_install (a_prompt
, input_handler
);
198 display_gdb_prompt (0);
200 /* Now it's time to start the event loop. */
204 /* Change the function to be invoked every time there is a character
205 ready on stdin. This is used when the user sets the editing off,
206 therefore bypassing readline, and letting gdb handle the input
207 itself, via gdb_readline2. Also it is used in the opposite case in
208 which the user sets editing on again, by restoring readline
209 handling of the input. */
211 change_line_handler (void)
213 /* NOTE: this operates on input_fd, not instream. If we are reading
214 commands from a file, instream will point to the file. However in
215 async mode, we always read commands from a file with editing
216 off. This means that the 'set editing on/off' will have effect
217 only on the interactive session. */
219 if (async_command_editing_p
)
221 /* Turn on editing by using readline. */
222 call_readline
= rl_callback_read_char_wrapper
;
223 input_handler
= command_line_handler
;
227 /* Turn off editing by using gdb_readline2. */
228 rl_callback_handler_remove ();
229 call_readline
= gdb_readline2
;
231 /* Set up the command handler as well, in case we are called as
232 first thing from .gdbinit. */
233 input_handler
= command_line_handler
;
237 /* Displays the prompt. The prompt that is displayed is the current
238 top of the prompt stack, if the argument NEW_PROMPT is
239 0. Otherwise, it displays whatever NEW_PROMPT is. This is used
240 after each gdb command has completed, and in the following cases:
241 1. when the user enters a command line which is ended by '\'
242 indicating that the command will continue on the next line.
243 In that case the prompt that is displayed is the empty string.
244 2. When the user is entering 'commands' for a breakpoint, or
245 actions for a tracepoint. In this case the prompt will be '>'
247 FIXME: 2. & 3. not implemented yet for async. */
249 display_gdb_prompt (char *new_prompt
)
251 int prompt_length
= 0;
252 char *gdb_prompt
= get_prompt ();
254 /* Each interpreter has its own rules on displaying the command
256 if (!current_interp_display_prompt_p ())
259 if (target_executing
&& sync_execution
)
261 /* This is to trick readline into not trying to display the
262 prompt. Even though we display the prompt using this
263 function, readline still tries to do its own display if we
264 don't call rl_callback_handler_install and
265 rl_callback_handler_remove (which readline detects because a
266 global variable is not set). If readline did that, it could
267 mess up gdb signal handlers for SIGINT. Readline assumes
268 that between calls to rl_set_signals and rl_clear_signals gdb
269 doesn't do anything with the signal handlers. Well, that's
270 not the case, because when the target executes we change the
271 SIGINT signal handler. If we allowed readline to display the
272 prompt, the signal handler change would happen exactly
273 between the calls to the above two functions.
274 Calling rl_callback_handler_remove(), does the job. */
276 rl_callback_handler_remove ();
282 /* Just use the top of the prompt stack. */
283 prompt_length
= strlen (PREFIX (0)) +
284 strlen (SUFFIX (0)) +
285 strlen (gdb_prompt
) + 1;
287 new_prompt
= (char *) alloca (prompt_length
);
289 /* Prefix needs to have new line at end. */
290 strcpy (new_prompt
, PREFIX (0));
291 strcat (new_prompt
, gdb_prompt
);
292 /* Suffix needs to have a new line at end and \032 \032 at
294 strcat (new_prompt
, SUFFIX (0));
297 if (async_command_editing_p
)
299 rl_callback_handler_remove ();
300 rl_callback_handler_install (new_prompt
, input_handler
);
302 /* new_prompt at this point can be the top of the stack or the one passed in */
305 /* Don't use a _filtered function here. It causes the assumed
306 character position to be off, since the newline we read from
307 the user is not accounted for. */
308 fputs_unfiltered (new_prompt
, gdb_stdout
);
309 gdb_flush (gdb_stdout
);
313 /* Used when the user requests a different annotation level, with
314 'set annotate'. It pushes a new prompt (with prefix and suffix) on top
315 of the prompt stack, if the annotation level desired is 2, otherwise
316 it pops the top of the prompt stack when we want the annotation level
317 to be the normal ones (1 or 0). */
319 change_annotation_level (void)
321 char *prefix
, *suffix
;
323 if (!PREFIX (0) || !PROMPT (0) || !SUFFIX (0))
325 /* The prompt stack has not been initialized to "", we are
326 using gdb w/o the --async switch */
327 warning ("Command has same effect as set annotate");
331 if (annotation_level
> 1)
333 if (!strcmp (PREFIX (0), "") && !strcmp (SUFFIX (0), ""))
335 /* Push a new prompt if the previous annotation_level was not >1. */
336 prefix
= (char *) alloca (strlen (async_annotation_suffix
) + 10);
337 strcpy (prefix
, "\n\032\032pre-");
338 strcat (prefix
, async_annotation_suffix
);
339 strcat (prefix
, "\n");
341 suffix
= (char *) alloca (strlen (async_annotation_suffix
) + 6);
342 strcpy (suffix
, "\n\032\032");
343 strcat (suffix
, async_annotation_suffix
);
344 strcat (suffix
, "\n");
346 push_prompt (prefix
, (char *) 0, suffix
);
351 if (strcmp (PREFIX (0), "") && strcmp (SUFFIX (0), ""))
353 /* Pop the top of the stack, we are going back to annotation < 1. */
359 /* Pushes a new prompt on the prompt stack. Each prompt has three
360 parts: prefix, prompt, suffix. Usually prefix and suffix are empty
361 strings, except when the annotation level is 2. Memory is allocated
362 within savestring for the new prompt. */
364 push_prompt (char *prefix
, char *prompt
, char *suffix
)
367 PREFIX (0) = savestring (prefix
, strlen (prefix
));
369 /* Note that this function is used by the set annotate 2
370 command. This is why we take care of saving the old prompt
371 in case a new one is not specified. */
373 PROMPT (0) = savestring (prompt
, strlen (prompt
));
375 PROMPT (0) = savestring (PROMPT (-1), strlen (PROMPT (-1)));
377 SUFFIX (0) = savestring (suffix
, strlen (suffix
));
380 /* Pops the top of the prompt stack, and frees the memory allocated for it. */
384 /* If we are not during a 'synchronous' execution command, in which
385 case, the top prompt would be empty. */
386 if (strcmp (PROMPT (0), ""))
387 /* This is for the case in which the prompt is set while the
388 annotation level is 2. The top prompt will be changed, but when
389 we return to annotation level < 2, we want that new prompt to be
390 in effect, until the user does another 'set prompt'. */
391 if (strcmp (PROMPT (0), PROMPT (-1)))
394 PROMPT (-1) = savestring (PROMPT (0), strlen (PROMPT (0)));
403 /* When there is an event ready on the stdin file desriptor, instead
404 of calling readline directly throught the callback function, or
405 instead of calling gdb_readline2, give gdb a chance to detect
406 errors and do something. */
408 stdin_event_handler (int error
, gdb_client_data client_data
)
412 printf_unfiltered ("error detected on stdin\n");
413 delete_file_handler (input_fd
);
414 discard_all_continuations ();
415 /* If stdin died, we may as well kill gdb. */
416 quit_command ((char *) 0, stdin
== instream
);
419 (*call_readline
) (client_data
);
422 /* Re-enable stdin after the end of an execution command in
423 synchronous mode, or after an error from the target, and we aborted
424 the exec operation. */
427 async_enable_stdin (void *dummy
)
429 /* See NOTE in async_disable_stdin() */
430 /* FIXME: cagney/1999-09-27: Call this before clearing
431 sync_execution. Current target_terminal_ours() implementations
432 check for sync_execution before switching the terminal. */
433 target_terminal_ours ();
438 /* Disable reads from stdin (the console) marking the command as
442 async_disable_stdin (void)
445 push_prompt ("", "", "");
446 /* FIXME: cagney/1999-09-27: At present this call is technically
447 redundant since infcmd.c and infrun.c both already call
448 target_terminal_inferior(). As the terminal handling (in
449 sync/async mode) is refined, the duplicate calls can be
450 eliminated (Here or in infcmd.c/infrun.c). */
451 target_terminal_inferior ();
452 /* Add the reinstate of stdin to the list of cleanups to be done
453 in case the target errors out and dies. These cleanups are also
454 done in case of normal successful termination of the execution
455 command, by complete_execution(). */
456 make_exec_error_cleanup (async_enable_stdin
, NULL
);
460 /* Handles a gdb command. This function is called by
461 command_line_handler, which has processed one or more input lines
463 /* NOTE: 1999-04-30 This is the asynchronous version of the command_loop
464 function. The command_loop function will be obsolete when we
465 switch to use the event loop at every execution of gdb. */
467 command_handler (char *command
)
469 struct cleanup
*old_chain
;
470 int stdin_is_tty
= ISATTY (stdin
);
471 struct continuation_arg
*arg1
;
472 struct continuation_arg
*arg2
;
473 long time_at_cmd_start
;
475 long space_at_cmd_start
= 0;
477 extern int display_time
;
478 extern int display_space
;
481 if (instream
== stdin
&& stdin_is_tty
)
482 reinitialize_more_filter ();
483 old_chain
= make_cleanup (null_cleanup
, 0);
485 /* If readline returned a NULL command, it means that the
486 connection with the terminal is gone. This happens at the
487 end of a testsuite run, after Expect has hung up
488 but GDB is still alive. In such a case, we just quit gdb
489 killing the inferior program too. */
491 quit_command ((char *) 0, stdin
== instream
);
493 time_at_cmd_start
= get_run_time ();
498 extern char **environ
;
499 char *lim
= (char *) sbrk (0);
501 space_at_cmd_start
= (long) (lim
- (char *) &environ
);
505 execute_command (command
, instream
== stdin
);
507 /* Set things up for this function to be compete later, once the
508 execution has completed, if we are doing an execution command,
509 otherwise, just go ahead and finish. */
510 if (target_can_async_p () && target_executing
)
513 (struct continuation_arg
*) xmalloc (sizeof (struct continuation_arg
));
515 (struct continuation_arg
*) xmalloc (sizeof (struct continuation_arg
));
518 arg1
->data
.longint
= time_at_cmd_start
;
520 arg2
->data
.longint
= space_at_cmd_start
;
522 add_continuation (command_line_handler_continuation
, arg1
);
525 /* Do any commands attached to breakpoint we stopped at. Only if we
526 are always running synchronously. Or if we have just executed a
527 command that doesn't start the target. */
528 if (!target_can_async_p () || !target_executing
)
530 bpstat_do_actions (&stop_bpstat
);
531 do_cleanups (old_chain
);
535 long cmd_time
= get_run_time () - time_at_cmd_start
;
537 printf_unfiltered ("Command execution time: %ld.%06ld\n",
538 cmd_time
/ 1000000, cmd_time
% 1000000);
544 extern char **environ
;
545 char *lim
= (char *) sbrk (0);
546 long space_now
= lim
- (char *) &environ
;
547 long space_diff
= space_now
- space_at_cmd_start
;
549 printf_unfiltered ("Space used: %ld (%c%ld for this command)\n",
551 (space_diff
>= 0 ? '+' : '-'),
558 /* Do any commands attached to breakpoint we stopped at. Only if we
559 are always running synchronously. Or if we have just executed a
560 command that doesn't start the target. */
562 command_line_handler_continuation (struct continuation_arg
*arg
)
564 extern int display_time
;
565 extern int display_space
;
567 long time_at_cmd_start
= arg
->data
.longint
;
568 long space_at_cmd_start
= arg
->next
->data
.longint
;
570 bpstat_do_actions (&stop_bpstat
);
571 /*do_cleanups (old_chain); *//*?????FIXME????? */
575 long cmd_time
= get_run_time () - time_at_cmd_start
;
577 printf_unfiltered ("Command execution time: %ld.%06ld\n",
578 cmd_time
/ 1000000, cmd_time
% 1000000);
583 extern char **environ
;
584 char *lim
= (char *) sbrk (0);
585 long space_now
= lim
- (char *) &environ
;
586 long space_diff
= space_now
- space_at_cmd_start
;
588 printf_unfiltered ("Space used: %ld (%c%ld for this command)\n",
590 (space_diff
>= 0 ? '+' : '-'),
596 /* Handle a complete line of input. This is called by the callback
597 mechanism within the readline library. Deal with incomplete commands
598 as well, by saving the partial input in a global buffer. */
600 /* NOTE: 1999-04-30 This is the asynchronous version of the
601 command_line_input function. command_line_input will become
602 obsolete once we use the event loop as the default mechanism in
605 command_line_handler (char *rl
)
607 static char *linebuffer
= 0;
608 static unsigned linelength
= 0;
617 int repeat
= (instream
== stdin
);
619 if (annotation_level
> 1 && instream
== stdin
)
621 printf_unfiltered ("\n\032\032post-");
622 printf_unfiltered (async_annotation_suffix
);
623 printf_unfiltered ("\n");
629 linebuffer
= (char *) xmalloc (linelength
);
636 strcpy (linebuffer
, readline_input_state
.linebuffer
);
637 p
= readline_input_state
.linebuffer_ptr
;
638 xfree (readline_input_state
.linebuffer
);
645 signal (STOP_SIGNAL
, handle_stop_sig
);
648 /* Make sure that all output has been output. Some machines may let
649 you get away with leaving out some of the gdb_flush, but not all. */
651 gdb_flush (gdb_stdout
);
652 gdb_flush (gdb_stderr
);
654 if (source_file_name
!= NULL
)
656 ++source_line_number
;
657 sprintf (source_error
,
658 "%s%s:%d: Error in sourced command file:\n",
662 error_pre_print
= source_error
;
665 /* If we are in this case, then command_handler will call quit
666 and exit from gdb. */
667 if (!rl
|| rl
== (char *) EOF
)
672 if (strlen (rl
) + 1 + (p
- linebuffer
) > linelength
)
674 linelength
= strlen (rl
) + 1 + (p
- linebuffer
);
675 nline
= (char *) xrealloc (linebuffer
, linelength
);
676 p
+= nline
- linebuffer
;
680 /* Copy line. Don't copy null at end. (Leaves line alone
681 if this was just a newline) */
685 xfree (rl
); /* Allocated in readline. */
687 if (p
> linebuffer
&& *(p
- 1) == '\\')
689 p
--; /* Put on top of '\'. */
691 readline_input_state
.linebuffer
= savestring (linebuffer
,
692 strlen (linebuffer
));
693 readline_input_state
.linebuffer_ptr
= p
;
695 /* We will not invoke a execute_command if there is more
696 input expected to complete the command. So, we need to
697 print an empty prompt here. */
699 push_prompt ("", "", "");
700 display_gdb_prompt (0);
706 signal (STOP_SIGNAL
, SIG_DFL
);
709 #define SERVER_COMMAND_LENGTH 7
711 (p
- linebuffer
> SERVER_COMMAND_LENGTH
)
712 && STREQN (linebuffer
, "server ", SERVER_COMMAND_LENGTH
);
715 /* Note that we don't set `line'. Between this and the check in
716 dont_repeat, this insures that repeating will still do the
719 command_handler (linebuffer
+ SERVER_COMMAND_LENGTH
);
720 display_gdb_prompt (0);
724 /* Do history expansion if that is wished. */
725 if (history_expansion_p
&& instream
== stdin
726 && ISATTY (instream
))
731 *p
= '\0'; /* Insert null now. */
732 expanded
= history_expand (linebuffer
, &history_value
);
735 /* Print the changes. */
736 printf_unfiltered ("%s\n", history_value
);
738 /* If there was an error, call this function again. */
741 xfree (history_value
);
744 if (strlen (history_value
) > linelength
)
746 linelength
= strlen (history_value
) + 1;
747 linebuffer
= (char *) xrealloc (linebuffer
, linelength
);
749 strcpy (linebuffer
, history_value
);
750 p
= linebuffer
+ strlen (linebuffer
);
751 xfree (history_value
);
755 /* If we just got an empty line, and that is supposed
756 to repeat the previous command, return the value in the
758 if (repeat
&& p
== linebuffer
&& *p
!= '\\')
760 command_handler (line
);
761 display_gdb_prompt (0);
765 for (p1
= linebuffer
; *p1
== ' ' || *p1
== '\t'; p1
++);
768 command_handler (line
);
769 display_gdb_prompt (0);
775 /* Add line to history if appropriate. */
776 if (instream
== stdin
777 && ISATTY (stdin
) && *linebuffer
)
778 add_history (linebuffer
);
780 /* Note: lines consisting solely of comments are added to the command
781 history. This is useful when you type a command, and then
782 realize you don't want to execute it quite yet. You can comment
783 out the command and then later fetch it from the value history
784 and remove the '#'. The kill ring is probably better, but some
785 people are in the habit of commenting things out. */
787 *p1
= '\0'; /* Found a comment. */
789 /* Save into global buffer if appropriate. */
792 if (linelength
> linesize
)
794 line
= xrealloc (line
, linelength
);
795 linesize
= linelength
;
797 strcpy (line
, linebuffer
);
800 command_handler (line
);
801 display_gdb_prompt (0);
806 command_handler (linebuffer
);
807 display_gdb_prompt (0);
811 /* Does reading of input from terminal w/o the editing features
812 provided by the readline library. */
814 /* NOTE: 1999-04-30 Asynchronous version of gdb_readline. gdb_readline
815 will become obsolete when the event loop is made the default
816 execution for gdb. */
818 gdb_readline2 (gdb_client_data client_data
)
823 int result_size
= 80;
824 static int done_once
= 0;
826 /* Unbuffer the input stream, so that, later on, the calls to fgetc
827 fetch only one char at the time from the stream. The fgetc's will
828 get up to the first newline, but there may be more chars in the
829 stream after '\n'. If we buffer the input and fgetc drains the
830 stream, getting stuff beyond the newline as well, a select, done
831 afterwards will not trigger. */
832 if (!done_once
&& !ISATTY (instream
))
834 setbuf (instream
, NULL
);
838 result
= (char *) xmalloc (result_size
);
840 /* We still need the while loop here, even though it would seem
841 obvious to invoke gdb_readline2 at every character entered. If
842 not using the readline library, the terminal is in cooked mode,
843 which sends the characters all at once. Poll will notice that the
844 input fd has changed state only after enter is pressed. At this
845 point we still need to fetch all the chars entered. */
849 /* Read from stdin if we are executing a user defined command.
850 This is the right thing for prompt_for_continue, at least. */
851 c
= fgetc (instream
? instream
: stdin
);
856 /* The last line does not end with a newline. Return it, and
857 if we are called again fgetc will still return EOF and
858 we'll return NULL then. */
861 (*input_handler
) (0);
865 #ifndef CRLF_SOURCE_FILES
869 if (input_index
> 0 && result
[input_index
- 1] == '\r')
875 result
[input_index
++] = c
;
876 while (input_index
>= result_size
)
879 result
= (char *) xrealloc (result
, result_size
);
883 result
[input_index
++] = '\0';
884 (*input_handler
) (result
);
888 /* Initialization of signal handlers and tokens. There is a function
889 handle_sig* for each of the signals GDB cares about. Specifically:
890 SIGINT, SIGFPE, SIGQUIT, SIGTSTP, SIGHUP, SIGWINCH. These
891 functions are the actual signal handlers associated to the signals
892 via calls to signal(). The only job for these functions is to
893 enqueue the appropriate event/procedure with the event loop. Such
894 procedures are the old signal handlers. The event loop will take
895 care of invoking the queued procedures to perform the usual tasks
896 associated with the reception of the signal. */
897 /* NOTE: 1999-04-30 This is the asynchronous version of init_signals.
898 init_signals will become obsolete as we move to have to event loop
899 as the default for gdb. */
901 async_init_signals (void)
903 signal (SIGINT
, handle_sigint
);
905 create_async_signal_handler (async_request_quit
, NULL
);
907 /* If SIGTRAP was set to SIG_IGN, then the SIG_IGN will get passed
908 to the inferior and breakpoints will be ignored. */
910 signal (SIGTRAP
, SIG_DFL
);
913 /* If we initialize SIGQUIT to SIG_IGN, then the SIG_IGN will get
914 passed to the inferior, which we don't want. It would be
915 possible to do a "signal (SIGQUIT, SIG_DFL)" after we fork, but
916 on BSD4.3 systems using vfork, that can affect the
917 GDB process as well as the inferior (the signal handling tables
918 might be in memory, shared between the two). Since we establish
919 a handler for SIGQUIT, when we call exec it will set the signal
920 to SIG_DFL for us. */
921 signal (SIGQUIT
, handle_sigquit
);
923 create_async_signal_handler (async_do_nothing
, NULL
);
925 if (signal (SIGHUP
, handle_sighup
) != SIG_IGN
)
927 create_async_signal_handler (async_disconnect
, NULL
);
930 create_async_signal_handler (async_do_nothing
, NULL
);
932 signal (SIGFPE
, handle_sigfpe
);
934 create_async_signal_handler (async_float_handler
, NULL
);
936 #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER)
937 signal (SIGWINCH
, handle_sigwinch
);
939 create_async_signal_handler (SIGWINCH_HANDLER
, NULL
);
943 create_async_signal_handler (async_stop_sig
, NULL
);
949 mark_async_signal_handler_wrapper (void *token
)
951 mark_async_signal_handler ((struct async_signal_handler
*) token
);
954 /* Tell the event loop what to do if SIGINT is received.
955 See event-signal.c. */
957 handle_sigint (int sig
)
959 signal (sig
, handle_sigint
);
961 /* If immediate_quit is set, we go ahead and process the SIGINT right
962 away, even if we usually would defer this to the event loop. The
963 assumption here is that it is safe to process ^C immediately if
964 immediate_quit is set. If we didn't, SIGINT would be really
965 processed only the next time through the event loop. To get to
966 that point, though, the command that we want to interrupt needs to
967 finish first, which is unacceptable. */
969 async_request_quit (0);
971 /* If immediate quit is not set, we process SIGINT the next time
972 through the loop, which is fine. */
973 mark_async_signal_handler_wrapper (sigint_token
);
976 /* Do the quit. All the checks have been done by the caller. */
978 async_request_quit (gdb_client_data arg
)
988 /* Tell the event loop what to do if SIGQUIT is received.
989 See event-signal.c. */
991 handle_sigquit (int sig
)
993 mark_async_signal_handler_wrapper (sigquit_token
);
994 signal (sig
, handle_sigquit
);
997 /* Called by the event loop in response to a SIGQUIT. */
999 async_do_nothing (gdb_client_data arg
)
1001 /* Empty function body. */
1005 /* Tell the event loop what to do if SIGHUP is received.
1006 See event-signal.c. */
1008 handle_sighup (int sig
)
1010 mark_async_signal_handler_wrapper (sighup_token
);
1011 signal (sig
, handle_sighup
);
1014 /* Called by the event loop to process a SIGHUP */
1016 async_disconnect (gdb_client_data arg
)
1018 catch_errors (quit_cover
, NULL
,
1019 "Could not kill the program being debugged",
1021 signal (SIGHUP
, SIG_DFL
); /*FIXME: ??????????? */
1022 kill (getpid (), SIGHUP
);
1028 handle_stop_sig (int sig
)
1030 mark_async_signal_handler_wrapper (sigtstp_token
);
1031 signal (sig
, handle_stop_sig
);
1035 async_stop_sig (gdb_client_data arg
)
1037 char *prompt
= get_prompt ();
1038 #if STOP_SIGNAL == SIGTSTP
1039 signal (SIGTSTP
, SIG_DFL
);
1040 #if HAVE_SIGPROCMASK
1044 sigemptyset (&zero
);
1045 sigprocmask (SIG_SETMASK
, &zero
, 0);
1047 #elif HAVE_SIGSETMASK
1050 kill (getpid (), SIGTSTP
);
1051 signal (SIGTSTP
, handle_stop_sig
);
1053 signal (STOP_SIGNAL
, handle_stop_sig
);
1055 printf_unfiltered ("%s", prompt
);
1056 gdb_flush (gdb_stdout
);
1058 /* Forget about any previous command -- null line now will do nothing. */
1061 #endif /* STOP_SIGNAL */
1063 /* Tell the event loop what to do if SIGFPE is received.
1064 See event-signal.c. */
1066 handle_sigfpe (int sig
)
1068 mark_async_signal_handler_wrapper (sigfpe_token
);
1069 signal (sig
, handle_sigfpe
);
1072 /* Event loop will call this functin to process a SIGFPE. */
1074 async_float_handler (gdb_client_data arg
)
1076 /* This message is based on ANSI C, section 4.7. Note that integer
1077 divide by zero causes this, so "float" is a misnomer. */
1078 error ("Erroneous arithmetic operation.");
1081 /* Tell the event loop what to do if SIGWINCH is received.
1082 See event-signal.c. */
1083 #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER)
1085 handle_sigwinch (int sig
)
1087 mark_async_signal_handler_wrapper (sigwinch_token
);
1088 signal (sig
, handle_sigwinch
);
1093 /* Called by do_setshow_command. */
1096 set_async_editing_command (char *args
, int from_tty
, struct cmd_list_element
*c
)
1098 change_line_handler ();
1101 /* Called by do_setshow_command. */
1104 set_async_annotation_level (char *args
, int from_tty
, struct cmd_list_element
*c
)
1106 change_annotation_level ();
1109 /* Called by do_setshow_command. */
1112 set_async_prompt (char *args
, int from_tty
, struct cmd_list_element
*c
)
1114 PROMPT (0) = savestring (new_async_prompt
, strlen (new_async_prompt
));
1117 /* Set things up for readline to be invoked via the alternate
1118 interface, i.e. via a callback function (rl_callback_read_char),
1119 and hook up instream to the event loop. */
1121 gdb_setup_readline (void)
1123 /* This function is a noop for the sync case. The assumption is that
1124 the sync setup is ALL done in gdb_init, and we would only mess it up
1125 here. The sync stuff should really go away over time. */
1129 gdb_stdout
= stdio_fileopen (stdout
);
1130 gdb_stderr
= stdio_fileopen (stderr
);
1131 gdb_stdlog
= gdb_stderr
; /* for moment */
1132 gdb_stdtarg
= gdb_stderr
; /* for moment */
1134 /* If the input stream is connected to a terminal, turn on
1136 if (ISATTY (instream
))
1138 /* Tell gdb that we will be using the readline library. This
1139 could be overwritten by a command in .gdbinit like 'set
1140 editing on' or 'off'. */
1141 async_command_editing_p
= 1;
1143 /* When a character is detected on instream by select or
1144 poll, readline will be invoked via this callback
1146 call_readline
= rl_callback_read_char_wrapper
;
1150 async_command_editing_p
= 0;
1151 call_readline
= gdb_readline2
;
1154 /* When readline has read an end-of-line character, it passes
1155 the complete line to gdb for processing. command_line_handler
1156 is the function that does this. */
1157 input_handler
= command_line_handler
;
1159 /* Tell readline to use the same input stream that gdb uses. */
1160 rl_instream
= instream
;
1162 /* Get a file descriptor for the input stream, so that we can
1163 register it with the event loop. */
1164 input_fd
= fileno (instream
);
1166 /* Now we need to create the event sources for the input file
1168 /* At this point in time, this is the only event source that we
1169 register with the even loop. Another source is going to be
1170 the target program (inferior), but that must be registered
1171 only when it actually exists (I.e. after we say 'run' or
1172 after we connect to a remote target. */
1173 add_file_handler (input_fd
, stdin_event_handler
, 0);
1177 /* Disable command input through the standard CLI channels. Used in
1178 the suspend proc for interpreters that use the standard gdb readline
1179 interface, like the cli & the mi. */
1181 gdb_disable_readline (void)
1185 /* FIXME - It is too heavyweight to delete and remake these
1186 every time you run an interpreter that needs readline.
1187 It is probably better to have the interpreters cache these,
1188 which in turn means that this needs to be moved into interpreter
1192 ui_file_delete (gdb_stdout
);
1193 ui_file_delete (gdb_stderr
);
1198 rl_callback_handler_remove ();
1199 delete_file_handler (input_fd
);
1204 _initialize_event_loop (void)
1206 /* Tell gdb to use the cli_command_loop as the main loop. */
1207 if (event_loop_p
&& command_loop_hook
== NULL
)
1208 command_loop_hook
= cli_command_loop
;