1 /* Top level stuff for GDB, the GNU debugger.
3 Copyright (C) 1999, 2000, 2001, 2002, 2004, 2005 Free Software
6 Written by Elena Zannoni <ezannoni@cygnus.com> of Cygnus Solutions.
8 This file is part of GDB.
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 2 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program; if not, write to the Free Software
22 Foundation, Inc., 51 Franklin Street, Fifth Floor,
23 Boston, MA 02110-1301, USA. */
29 #include "terminal.h" /* for job_control */
30 #include "event-loop.h"
31 #include "event-top.h"
34 #include "exceptions.h"
36 /* For dont_repeat() */
39 /* readline include files */
40 #include "readline/readline.h"
41 #include "readline/history.h"
43 /* readline defines this. */
46 static void rl_callback_read_char_wrapper (gdb_client_data client_data
);
47 static void command_line_handler (char *rl
);
48 static void command_line_handler_continuation (struct continuation_arg
*arg
);
49 static void change_line_handler (void);
50 static void change_annotation_level (void);
51 static void command_handler (char *command
);
53 /* Signal handlers. */
55 static void handle_sigquit (int sig
);
58 static void handle_sighup (int sig
);
60 static void handle_sigfpe (int sig
);
61 #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER)
62 static void handle_sigwinch (int sig
);
65 /* Functions to be invoked by the event loop in response to
67 #if defined (SIGQUIT) || defined (SIGHUP)
68 static void async_do_nothing (gdb_client_data
);
71 static void async_disconnect (gdb_client_data
);
73 static void async_float_handler (gdb_client_data
);
75 static void async_stop_sig (gdb_client_data
);
78 /* Readline offers an alternate interface, via callback
79 functions. These are all included in the file callback.c in the
80 readline distribution. This file provides (mainly) a function, which
81 the event loop uses as callback (i.e. event handler) whenever an event
82 is detected on the standard input file descriptor.
83 readline_callback_read_char is called (by the GDB event loop) whenever
84 there is a new character ready on the input stream. This function
85 incrementally builds a buffer internal to readline where it
86 accumulates the line read up to the point of invocation. In the
87 special case in which the character read is newline, the function
88 invokes a GDB supplied callback routine, which does the processing of
89 a full command line. This latter routine is the asynchronous analog
90 of the old command_line_input in gdb. Instead of invoking (and waiting
91 for) readline to read the command line and pass it back to
92 command_loop for processing, the new command_line_handler function has
93 the command line already available as its parameter. INPUT_HANDLER is
94 to be set to the function that readline will invoke when a complete
95 line of input is ready. CALL_READLINE is to be set to the function
96 that readline offers as callback to the event_loop. */
98 void (*input_handler
) (char *);
99 void (*call_readline
) (gdb_client_data
);
101 /* Important variables for the event loop. */
103 /* This is used to determine if GDB is using the readline library or
104 its own simplified form of readline. It is used by the asynchronous
105 form of the set editing command.
106 ezannoni: as of 1999-04-29 I expect that this
107 variable will not be used after gdb is changed to use the event
108 loop as default engine, and event-top.c is merged into top.c. */
109 int async_command_editing_p
;
111 /* This variable contains the new prompt that the user sets with the
112 set prompt command. */
113 char *new_async_prompt
;
115 /* This is the annotation suffix that will be used when the
116 annotation_level is 2. */
117 char *async_annotation_suffix
;
119 /* This is used to display the notification of the completion of an
120 asynchronous execution command. */
121 int exec_done_display_p
= 0;
123 /* This is the file descriptor for the input stream that GDB uses to
124 read commands from. */
127 /* This is the prompt stack. Prompts will be pushed on the stack as
128 needed by the different 'kinds' of user inputs GDB is asking
129 for. See event-loop.h. */
130 struct prompts the_prompts
;
132 /* signal handling variables */
133 /* Each of these is a pointer to a function that the event loop will
134 invoke if the corresponding signal has received. The real signal
135 handlers mark these functions as ready to be executed and the event
136 loop, in a later iteration, calls them. See the function
137 invoke_async_signal_handler. */
146 #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER)
147 void *sigwinch_token
;
153 /* Structure to save a partially entered command. This is used when
154 the user types '\' at the end of a command line. This is necessary
155 because each line of input is handled by a different call to
156 command_line_handler, and normally there is no state retained
157 between different calls. */
158 int more_to_come
= 0;
160 struct readline_input_state
163 char *linebuffer_ptr
;
165 readline_input_state
;
167 /* This hook is called by rl_callback_read_char_wrapper after each
168 character is processed. */
169 void (*after_char_processing_hook
) ();
172 /* Wrapper function for calling into the readline library. The event
173 loop expects the callback function to have a paramter, while readline
176 rl_callback_read_char_wrapper (gdb_client_data client_data
)
178 rl_callback_read_char ();
179 if (after_char_processing_hook
)
180 (*after_char_processing_hook
) ();
183 /* Initialize all the necessary variables, start the event loop,
184 register readline, and stdin, start the loop. */
186 cli_command_loop (void)
190 char *gdb_prompt
= get_prompt ();
192 /* If we are using readline, set things up and display the first
193 prompt, otherwise just print the prompt. */
194 if (async_command_editing_p
)
196 /* Tell readline what the prompt to display is and what function it
197 will need to call after a whole line is read. This also displays
199 length
= strlen (PREFIX (0)) + strlen (gdb_prompt
) + strlen (SUFFIX (0)) + 1;
200 a_prompt
= (char *) xmalloc (length
);
201 strcpy (a_prompt
, PREFIX (0));
202 strcat (a_prompt
, gdb_prompt
);
203 strcat (a_prompt
, SUFFIX (0));
204 rl_callback_handler_install (a_prompt
, input_handler
);
207 display_gdb_prompt (0);
209 /* Now it's time to start the event loop. */
213 /* Change the function to be invoked every time there is a character
214 ready on stdin. This is used when the user sets the editing off,
215 therefore bypassing readline, and letting gdb handle the input
216 itself, via gdb_readline2. Also it is used in the opposite case in
217 which the user sets editing on again, by restoring readline
218 handling of the input. */
220 change_line_handler (void)
222 /* NOTE: this operates on input_fd, not instream. If we are reading
223 commands from a file, instream will point to the file. However in
224 async mode, we always read commands from a file with editing
225 off. This means that the 'set editing on/off' will have effect
226 only on the interactive session. */
228 if (async_command_editing_p
)
230 /* Turn on editing by using readline. */
231 call_readline
= rl_callback_read_char_wrapper
;
232 input_handler
= command_line_handler
;
236 /* Turn off editing by using gdb_readline2. */
237 rl_callback_handler_remove ();
238 call_readline
= gdb_readline2
;
240 /* Set up the command handler as well, in case we are called as
241 first thing from .gdbinit. */
242 input_handler
= command_line_handler
;
246 /* Displays the prompt. The prompt that is displayed is the current
247 top of the prompt stack, if the argument NEW_PROMPT is
248 0. Otherwise, it displays whatever NEW_PROMPT is. This is used
249 after each gdb command has completed, and in the following cases:
250 1. when the user enters a command line which is ended by '\'
251 indicating that the command will continue on the next line.
252 In that case the prompt that is displayed is the empty string.
253 2. When the user is entering 'commands' for a breakpoint, or
254 actions for a tracepoint. In this case the prompt will be '>'
256 FIXME: 2. & 3. not implemented yet for async. */
258 display_gdb_prompt (char *new_prompt
)
260 int prompt_length
= 0;
261 char *gdb_prompt
= get_prompt ();
263 /* Each interpreter has its own rules on displaying the command
265 if (!current_interp_display_prompt_p ())
268 if (target_executing
&& sync_execution
)
270 /* This is to trick readline into not trying to display the
271 prompt. Even though we display the prompt using this
272 function, readline still tries to do its own display if we
273 don't call rl_callback_handler_install and
274 rl_callback_handler_remove (which readline detects because a
275 global variable is not set). If readline did that, it could
276 mess up gdb signal handlers for SIGINT. Readline assumes
277 that between calls to rl_set_signals and rl_clear_signals gdb
278 doesn't do anything with the signal handlers. Well, that's
279 not the case, because when the target executes we change the
280 SIGINT signal handler. If we allowed readline to display the
281 prompt, the signal handler change would happen exactly
282 between the calls to the above two functions.
283 Calling rl_callback_handler_remove(), does the job. */
285 rl_callback_handler_remove ();
291 /* Just use the top of the prompt stack. */
292 prompt_length
= strlen (PREFIX (0)) +
293 strlen (SUFFIX (0)) +
294 strlen (gdb_prompt
) + 1;
296 new_prompt
= (char *) alloca (prompt_length
);
298 /* Prefix needs to have new line at end. */
299 strcpy (new_prompt
, PREFIX (0));
300 strcat (new_prompt
, gdb_prompt
);
301 /* Suffix needs to have a new line at end and \032 \032 at
303 strcat (new_prompt
, SUFFIX (0));
306 if (async_command_editing_p
)
308 rl_callback_handler_remove ();
309 rl_callback_handler_install (new_prompt
, input_handler
);
311 /* new_prompt at this point can be the top of the stack or the one passed in */
314 /* Don't use a _filtered function here. It causes the assumed
315 character position to be off, since the newline we read from
316 the user is not accounted for. */
317 fputs_unfiltered (new_prompt
, gdb_stdout
);
318 gdb_flush (gdb_stdout
);
322 /* Used when the user requests a different annotation level, with
323 'set annotate'. It pushes a new prompt (with prefix and suffix) on top
324 of the prompt stack, if the annotation level desired is 2, otherwise
325 it pops the top of the prompt stack when we want the annotation level
326 to be the normal ones (1 or 0). */
328 change_annotation_level (void)
330 char *prefix
, *suffix
;
332 if (!PREFIX (0) || !PROMPT (0) || !SUFFIX (0))
334 /* The prompt stack has not been initialized to "", we are
335 using gdb w/o the --async switch */
336 warning (_("Command has same effect as set annotate"));
340 if (annotation_level
> 1)
342 if (!strcmp (PREFIX (0), "") && !strcmp (SUFFIX (0), ""))
344 /* Push a new prompt if the previous annotation_level was not >1. */
345 prefix
= (char *) alloca (strlen (async_annotation_suffix
) + 10);
346 strcpy (prefix
, "\n\032\032pre-");
347 strcat (prefix
, async_annotation_suffix
);
348 strcat (prefix
, "\n");
350 suffix
= (char *) alloca (strlen (async_annotation_suffix
) + 6);
351 strcpy (suffix
, "\n\032\032");
352 strcat (suffix
, async_annotation_suffix
);
353 strcat (suffix
, "\n");
355 push_prompt (prefix
, (char *) 0, suffix
);
360 if (strcmp (PREFIX (0), "") && strcmp (SUFFIX (0), ""))
362 /* Pop the top of the stack, we are going back to annotation < 1. */
368 /* Pushes a new prompt on the prompt stack. Each prompt has three
369 parts: prefix, prompt, suffix. Usually prefix and suffix are empty
370 strings, except when the annotation level is 2. Memory is allocated
371 within savestring for the new prompt. */
373 push_prompt (char *prefix
, char *prompt
, char *suffix
)
376 PREFIX (0) = savestring (prefix
, strlen (prefix
));
378 /* Note that this function is used by the set annotate 2
379 command. This is why we take care of saving the old prompt
380 in case a new one is not specified. */
382 PROMPT (0) = savestring (prompt
, strlen (prompt
));
384 PROMPT (0) = savestring (PROMPT (-1), strlen (PROMPT (-1)));
386 SUFFIX (0) = savestring (suffix
, strlen (suffix
));
389 /* Pops the top of the prompt stack, and frees the memory allocated for it. */
393 /* If we are not during a 'synchronous' execution command, in which
394 case, the top prompt would be empty. */
395 if (strcmp (PROMPT (0), ""))
396 /* This is for the case in which the prompt is set while the
397 annotation level is 2. The top prompt will be changed, but when
398 we return to annotation level < 2, we want that new prompt to be
399 in effect, until the user does another 'set prompt'. */
400 if (strcmp (PROMPT (0), PROMPT (-1)))
403 PROMPT (-1) = savestring (PROMPT (0), strlen (PROMPT (0)));
412 /* When there is an event ready on the stdin file desriptor, instead
413 of calling readline directly throught the callback function, or
414 instead of calling gdb_readline2, give gdb a chance to detect
415 errors and do something. */
417 stdin_event_handler (int error
, gdb_client_data client_data
)
421 printf_unfiltered (_("error detected on stdin\n"));
422 delete_file_handler (input_fd
);
423 discard_all_continuations ();
424 /* If stdin died, we may as well kill gdb. */
425 quit_command ((char *) 0, stdin
== instream
);
428 (*call_readline
) (client_data
);
431 /* Re-enable stdin after the end of an execution command in
432 synchronous mode, or after an error from the target, and we aborted
433 the exec operation. */
436 async_enable_stdin (void *dummy
)
438 /* See NOTE in async_disable_stdin() */
439 /* FIXME: cagney/1999-09-27: Call this before clearing
440 sync_execution. Current target_terminal_ours() implementations
441 check for sync_execution before switching the terminal. */
442 target_terminal_ours ();
447 /* Disable reads from stdin (the console) marking the command as
451 async_disable_stdin (void)
454 push_prompt ("", "", "");
455 /* FIXME: cagney/1999-09-27: At present this call is technically
456 redundant since infcmd.c and infrun.c both already call
457 target_terminal_inferior(). As the terminal handling (in
458 sync/async mode) is refined, the duplicate calls can be
459 eliminated (Here or in infcmd.c/infrun.c). */
460 target_terminal_inferior ();
461 /* Add the reinstate of stdin to the list of cleanups to be done
462 in case the target errors out and dies. These cleanups are also
463 done in case of normal successful termination of the execution
464 command, by complete_execution(). */
465 make_exec_error_cleanup (async_enable_stdin
, NULL
);
469 /* Handles a gdb command. This function is called by
470 command_line_handler, which has processed one or more input lines
472 /* NOTE: 1999-04-30 This is the asynchronous version of the command_loop
473 function. The command_loop function will be obsolete when we
474 switch to use the event loop at every execution of gdb. */
476 command_handler (char *command
)
478 struct cleanup
*old_chain
;
479 int stdin_is_tty
= ISATTY (stdin
);
480 struct continuation_arg
*arg1
;
481 struct continuation_arg
*arg2
;
482 long time_at_cmd_start
;
484 long space_at_cmd_start
= 0;
486 extern int display_time
;
487 extern int display_space
;
490 if (instream
== stdin
&& stdin_is_tty
)
491 reinitialize_more_filter ();
492 old_chain
= make_cleanup (null_cleanup
, 0);
494 /* If readline returned a NULL command, it means that the
495 connection with the terminal is gone. This happens at the
496 end of a testsuite run, after Expect has hung up
497 but GDB is still alive. In such a case, we just quit gdb
498 killing the inferior program too. */
500 quit_command ((char *) 0, stdin
== instream
);
502 time_at_cmd_start
= get_run_time ();
507 char *lim
= (char *) sbrk (0);
508 space_at_cmd_start
= lim
- lim_at_start
;
512 execute_command (command
, instream
== stdin
);
514 /* Set things up for this function to be compete later, once the
515 execution has completed, if we are doing an execution command,
516 otherwise, just go ahead and finish. */
517 if (target_can_async_p () && target_executing
)
520 (struct continuation_arg
*) xmalloc (sizeof (struct continuation_arg
));
522 (struct continuation_arg
*) xmalloc (sizeof (struct continuation_arg
));
525 arg1
->data
.longint
= time_at_cmd_start
;
527 arg2
->data
.longint
= space_at_cmd_start
;
529 add_continuation (command_line_handler_continuation
, arg1
);
532 /* Do any commands attached to breakpoint we stopped at. Only if we
533 are always running synchronously. Or if we have just executed a
534 command that doesn't start the target. */
535 if (!target_can_async_p () || !target_executing
)
537 bpstat_do_actions (&stop_bpstat
);
538 do_cleanups (old_chain
);
542 long cmd_time
= get_run_time () - time_at_cmd_start
;
544 printf_unfiltered (_("Command execution time: %ld.%06ld\n"),
545 cmd_time
/ 1000000, cmd_time
% 1000000);
551 char *lim
= (char *) sbrk (0);
552 long space_now
= lim
- lim_at_start
;
553 long space_diff
= space_now
- space_at_cmd_start
;
555 printf_unfiltered (_("Space used: %ld (%c%ld for this command)\n"),
557 (space_diff
>= 0 ? '+' : '-'),
564 /* Do any commands attached to breakpoint we stopped at. Only if we
565 are always running synchronously. Or if we have just executed a
566 command that doesn't start the target. */
568 command_line_handler_continuation (struct continuation_arg
*arg
)
570 extern int display_time
;
571 extern int display_space
;
573 long time_at_cmd_start
= arg
->data
.longint
;
574 long space_at_cmd_start
= arg
->next
->data
.longint
;
576 bpstat_do_actions (&stop_bpstat
);
577 /*do_cleanups (old_chain); *//*?????FIXME????? */
581 long cmd_time
= get_run_time () - time_at_cmd_start
;
583 printf_unfiltered (_("Command execution time: %ld.%06ld\n"),
584 cmd_time
/ 1000000, cmd_time
% 1000000);
589 char *lim
= (char *) sbrk (0);
590 long space_now
= lim
- lim_at_start
;
591 long space_diff
= space_now
- space_at_cmd_start
;
593 printf_unfiltered (_("Space used: %ld (%c%ld for this command)\n"),
595 (space_diff
>= 0 ? '+' : '-'),
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. */
605 /* NOTE: 1999-04-30 This is the asynchronous version of the
606 command_line_input function. command_line_input will become
607 obsolete once we use the event loop as the default mechanism in
610 command_line_handler (char *rl
)
612 static char *linebuffer
= 0;
613 static unsigned linelength
= 0;
622 int repeat
= (instream
== stdin
);
624 if (annotation_level
> 1 && instream
== stdin
)
626 printf_unfiltered (("\n\032\032post-"));
627 puts_unfiltered (async_annotation_suffix
);
628 printf_unfiltered (("\n"));
634 linebuffer
= (char *) xmalloc (linelength
);
641 strcpy (linebuffer
, readline_input_state
.linebuffer
);
642 p
= readline_input_state
.linebuffer_ptr
;
643 xfree (readline_input_state
.linebuffer
);
650 signal (STOP_SIGNAL
, handle_stop_sig
);
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. */
656 gdb_flush (gdb_stdout
);
657 gdb_flush (gdb_stderr
);
659 if (source_file_name
!= NULL
)
660 ++source_line_number
;
662 /* If we are in this case, then command_handler will call quit
663 and exit from gdb. */
664 if (!rl
|| rl
== (char *) EOF
)
669 if (strlen (rl
) + 1 + (p
- linebuffer
) > linelength
)
671 linelength
= strlen (rl
) + 1 + (p
- linebuffer
);
672 nline
= (char *) xrealloc (linebuffer
, linelength
);
673 p
+= nline
- linebuffer
;
677 /* Copy line. Don't copy null at end. (Leaves line alone
678 if this was just a newline) */
682 xfree (rl
); /* Allocated in readline. */
684 if (p
> linebuffer
&& *(p
- 1) == '\\')
686 p
--; /* Put on top of '\'. */
688 readline_input_state
.linebuffer
= savestring (linebuffer
,
689 strlen (linebuffer
));
690 readline_input_state
.linebuffer_ptr
= p
;
692 /* We will not invoke a execute_command if there is more
693 input expected to complete the command. So, we need to
694 print an empty prompt here. */
696 push_prompt ("", "", "");
697 display_gdb_prompt (0);
703 signal (STOP_SIGNAL
, SIG_DFL
);
706 #define SERVER_COMMAND_LENGTH 7
708 (p
- linebuffer
> SERVER_COMMAND_LENGTH
)
709 && strncmp (linebuffer
, "server ", SERVER_COMMAND_LENGTH
) == 0;
712 /* Note that we don't set `line'. Between this and the check in
713 dont_repeat, this insures that repeating will still do the
716 command_handler (linebuffer
+ SERVER_COMMAND_LENGTH
);
717 display_gdb_prompt (0);
721 /* Do history expansion if that is wished. */
722 if (history_expansion_p
&& instream
== stdin
723 && ISATTY (instream
))
728 *p
= '\0'; /* Insert null now. */
729 expanded
= history_expand (linebuffer
, &history_value
);
732 /* Print the changes. */
733 printf_unfiltered ("%s\n", history_value
);
735 /* If there was an error, call this function again. */
738 xfree (history_value
);
741 if (strlen (history_value
) > linelength
)
743 linelength
= strlen (history_value
) + 1;
744 linebuffer
= (char *) xrealloc (linebuffer
, linelength
);
746 strcpy (linebuffer
, history_value
);
747 p
= linebuffer
+ strlen (linebuffer
);
748 xfree (history_value
);
752 /* If we just got an empty line, and that is supposed
753 to repeat the previous command, return the value in the
755 if (repeat
&& p
== linebuffer
&& *p
!= '\\')
757 command_handler (line
);
758 display_gdb_prompt (0);
762 for (p1
= linebuffer
; *p1
== ' ' || *p1
== '\t'; p1
++);
765 command_handler (line
);
766 display_gdb_prompt (0);
772 /* Add line to history if appropriate. */
773 if (instream
== stdin
774 && ISATTY (stdin
) && *linebuffer
)
775 add_history (linebuffer
);
777 /* Note: lines consisting solely of comments are added to the command
778 history. This is useful when you type a command, and then
779 realize you don't want to execute it quite yet. You can comment
780 out the command and then later fetch it from the value history
781 and remove the '#'. The kill ring is probably better, but some
782 people are in the habit of commenting things out. */
784 *p1
= '\0'; /* Found a comment. */
786 /* Save into global buffer if appropriate. */
789 if (linelength
> linesize
)
791 line
= xrealloc (line
, linelength
);
792 linesize
= linelength
;
794 strcpy (line
, linebuffer
);
797 command_handler (line
);
798 display_gdb_prompt (0);
803 command_handler (linebuffer
);
804 display_gdb_prompt (0);
808 /* Does reading of input from terminal w/o the editing features
809 provided by the readline library. */
811 /* NOTE: 1999-04-30 Asynchronous version of gdb_readline. gdb_readline
812 will become obsolete when the event loop is made the default
813 execution for gdb. */
815 gdb_readline2 (gdb_client_data client_data
)
820 int result_size
= 80;
821 static int done_once
= 0;
823 /* Unbuffer the input stream, so that, later on, the calls to fgetc
824 fetch only one char at the time from the stream. The fgetc's will
825 get up to the first newline, but there may be more chars in the
826 stream after '\n'. If we buffer the input and fgetc drains the
827 stream, getting stuff beyond the newline as well, a select, done
828 afterwards will not trigger. */
829 if (!done_once
&& !ISATTY (instream
))
831 setbuf (instream
, NULL
);
835 result
= (char *) xmalloc (result_size
);
837 /* We still need the while loop here, even though it would seem
838 obvious to invoke gdb_readline2 at every character entered. If
839 not using the readline library, the terminal is in cooked mode,
840 which sends the characters all at once. Poll will notice that the
841 input fd has changed state only after enter is pressed. At this
842 point we still need to fetch all the chars entered. */
846 /* Read from stdin if we are executing a user defined command.
847 This is the right thing for prompt_for_continue, at least. */
848 c
= fgetc (instream
? instream
: stdin
);
853 /* The last line does not end with a newline. Return it, and
854 if we are called again fgetc will still return EOF and
855 we'll return NULL then. */
858 (*input_handler
) (0);
863 if (input_index
> 0 && result
[input_index
- 1] == '\r')
868 result
[input_index
++] = c
;
869 while (input_index
>= result_size
)
872 result
= (char *) xrealloc (result
, result_size
);
876 result
[input_index
++] = '\0';
877 (*input_handler
) (result
);
881 /* Initialization of signal handlers and tokens. There is a function
882 handle_sig* for each of the signals GDB cares about. Specifically:
883 SIGINT, SIGFPE, SIGQUIT, SIGTSTP, SIGHUP, SIGWINCH. These
884 functions are the actual signal handlers associated to the signals
885 via calls to signal(). The only job for these functions is to
886 enqueue the appropriate event/procedure with the event loop. Such
887 procedures are the old signal handlers. The event loop will take
888 care of invoking the queued procedures to perform the usual tasks
889 associated with the reception of the signal. */
890 /* NOTE: 1999-04-30 This is the asynchronous version of init_signals.
891 init_signals will become obsolete as we move to have to event loop
892 as the default for gdb. */
894 async_init_signals (void)
896 signal (SIGINT
, handle_sigint
);
898 create_async_signal_handler (async_request_quit
, NULL
);
899 signal (SIGTERM
, handle_sigterm
);
901 /* If SIGTRAP was set to SIG_IGN, then the SIG_IGN will get passed
902 to the inferior and breakpoints will be ignored. */
904 signal (SIGTRAP
, SIG_DFL
);
908 /* If we initialize SIGQUIT to SIG_IGN, then the SIG_IGN will get
909 passed to the inferior, which we don't want. It would be
910 possible to do a "signal (SIGQUIT, SIG_DFL)" after we fork, but
911 on BSD4.3 systems using vfork, that can affect the
912 GDB process as well as the inferior (the signal handling tables
913 might be in memory, shared between the two). Since we establish
914 a handler for SIGQUIT, when we call exec it will set the signal
915 to SIG_DFL for us. */
916 signal (SIGQUIT
, handle_sigquit
);
918 create_async_signal_handler (async_do_nothing
, NULL
);
921 if (signal (SIGHUP
, handle_sighup
) != SIG_IGN
)
923 create_async_signal_handler (async_disconnect
, NULL
);
926 create_async_signal_handler (async_do_nothing
, NULL
);
928 signal (SIGFPE
, handle_sigfpe
);
930 create_async_signal_handler (async_float_handler
, NULL
);
932 #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER)
933 signal (SIGWINCH
, handle_sigwinch
);
935 create_async_signal_handler (SIGWINCH_HANDLER
, NULL
);
939 create_async_signal_handler (async_stop_sig
, NULL
);
945 mark_async_signal_handler_wrapper (void *token
)
947 mark_async_signal_handler ((struct async_signal_handler
*) token
);
950 /* Tell the event loop what to do if SIGINT is received.
951 See event-signal.c. */
953 handle_sigint (int sig
)
955 signal (sig
, handle_sigint
);
957 /* If immediate_quit is set, we go ahead and process the SIGINT right
958 away, even if we usually would defer this to the event loop. The
959 assumption here is that it is safe to process ^C immediately if
960 immediate_quit is set. If we didn't, SIGINT would be really
961 processed only the next time through the event loop. To get to
962 that point, though, the command that we want to interrupt needs to
963 finish first, which is unacceptable. */
965 async_request_quit (0);
967 /* If immediate quit is not set, we process SIGINT the next time
968 through the loop, which is fine. */
969 mark_async_signal_handler_wrapper (sigint_token
);
972 /* Quit GDB if SIGTERM is received.
973 GDB would quit anyway, but this way it will clean up properly. */
975 handle_sigterm (int sig
)
977 signal (sig
, handle_sigterm
);
978 quit_force ((char *) 0, stdin
== instream
);
981 /* Do the quit. All the checks have been done by the caller. */
983 async_request_quit (gdb_client_data arg
)
990 /* Tell the event loop what to do if SIGQUIT is received.
991 See event-signal.c. */
993 handle_sigquit (int sig
)
995 mark_async_signal_handler_wrapper (sigquit_token
);
996 signal (sig
, handle_sigquit
);
1000 #if defined (SIGQUIT) || defined (SIGHUP)
1001 /* Called by the event loop in response to a SIGQUIT or an
1004 async_do_nothing (gdb_client_data arg
)
1006 /* Empty function body. */
1011 /* Tell the event loop what to do if SIGHUP is received.
1012 See event-signal.c. */
1014 handle_sighup (int sig
)
1016 mark_async_signal_handler_wrapper (sighup_token
);
1017 signal (sig
, handle_sighup
);
1020 /* Called by the event loop to process a SIGHUP */
1022 async_disconnect (gdb_client_data arg
)
1024 catch_errors (quit_cover
, NULL
,
1025 "Could not kill the program being debugged",
1027 signal (SIGHUP
, SIG_DFL
); /*FIXME: ??????????? */
1028 kill (getpid (), SIGHUP
);
1034 handle_stop_sig (int sig
)
1036 mark_async_signal_handler_wrapper (sigtstp_token
);
1037 signal (sig
, handle_stop_sig
);
1041 async_stop_sig (gdb_client_data arg
)
1043 char *prompt
= get_prompt ();
1044 #if STOP_SIGNAL == SIGTSTP
1045 signal (SIGTSTP
, SIG_DFL
);
1046 #if HAVE_SIGPROCMASK
1050 sigemptyset (&zero
);
1051 sigprocmask (SIG_SETMASK
, &zero
, 0);
1053 #elif HAVE_SIGSETMASK
1056 kill (getpid (), SIGTSTP
);
1057 signal (SIGTSTP
, handle_stop_sig
);
1059 signal (STOP_SIGNAL
, handle_stop_sig
);
1061 printf_unfiltered ("%s", prompt
);
1062 gdb_flush (gdb_stdout
);
1064 /* Forget about any previous command -- null line now will do nothing. */
1067 #endif /* STOP_SIGNAL */
1069 /* Tell the event loop what to do if SIGFPE is received.
1070 See event-signal.c. */
1072 handle_sigfpe (int sig
)
1074 mark_async_signal_handler_wrapper (sigfpe_token
);
1075 signal (sig
, handle_sigfpe
);
1078 /* Event loop will call this functin to process a SIGFPE. */
1080 async_float_handler (gdb_client_data arg
)
1082 /* This message is based on ANSI C, section 4.7. Note that integer
1083 divide by zero causes this, so "float" is a misnomer. */
1084 error (_("Erroneous arithmetic operation."));
1087 /* Tell the event loop what to do if SIGWINCH is received.
1088 See event-signal.c. */
1089 #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER)
1091 handle_sigwinch (int sig
)
1093 mark_async_signal_handler_wrapper (sigwinch_token
);
1094 signal (sig
, handle_sigwinch
);
1099 /* Called by do_setshow_command. */
1101 set_async_editing_command (char *args
, int from_tty
, struct cmd_list_element
*c
)
1103 change_line_handler ();
1106 /* Called by do_setshow_command. */
1108 set_async_annotation_level (char *args
, int from_tty
, struct cmd_list_element
*c
)
1110 change_annotation_level ();
1113 /* Called by do_setshow_command. */
1115 set_async_prompt (char *args
, int from_tty
, struct cmd_list_element
*c
)
1117 PROMPT (0) = savestring (new_async_prompt
, strlen (new_async_prompt
));
1120 /* Set things up for readline to be invoked via the alternate
1121 interface, i.e. via a callback function (rl_callback_read_char),
1122 and hook up instream to the event loop. */
1124 gdb_setup_readline (void)
1126 /* This function is a noop for the sync case. The assumption is
1127 that the sync setup is ALL done in gdb_init, and we would only
1128 mess it up here. The sync stuff should really go away over
1130 extern int batch_silent
;
1133 gdb_stdout
= stdio_fileopen (stdout
);
1134 gdb_stderr
= stdio_fileopen (stderr
);
1135 gdb_stdlog
= gdb_stderr
; /* for moment */
1136 gdb_stdtarg
= gdb_stderr
; /* for moment */
1138 /* If the input stream is connected to a terminal, turn on
1140 if (ISATTY (instream
))
1142 /* Tell gdb that we will be using the readline library. This
1143 could be overwritten by a command in .gdbinit like 'set
1144 editing on' or 'off'. */
1145 async_command_editing_p
= 1;
1147 /* When a character is detected on instream by select or poll,
1148 readline will be invoked via this callback function. */
1149 call_readline
= rl_callback_read_char_wrapper
;
1153 async_command_editing_p
= 0;
1154 call_readline
= gdb_readline2
;
1157 /* When readline has read an end-of-line character, it passes the
1158 complete line to gdb for processing. command_line_handler is the
1159 function that does this. */
1160 input_handler
= command_line_handler
;
1162 /* Tell readline to use the same input stream that gdb uses. */
1163 rl_instream
= instream
;
1165 /* Get a file descriptor for the input stream, so that we can
1166 register it with the event loop. */
1167 input_fd
= fileno (instream
);
1169 /* Now we need to create the event sources for the input file
1171 /* At this point in time, this is the only event source that we
1172 register with the even loop. Another source is going to be the
1173 target program (inferior), but that must be registered only when
1174 it actually exists (I.e. after we say 'run' or after we connect
1175 to a remote target. */
1176 add_file_handler (input_fd
, stdin_event_handler
, 0);
1179 /* Disable command input through the standard CLI channels. Used in
1180 the suspend proc for interpreters that use the standard gdb readline
1181 interface, like the cli & the mi. */
1183 gdb_disable_readline (void)
1185 /* FIXME - It is too heavyweight to delete and remake these every
1186 time you run an interpreter that needs readline. It is probably
1187 better to have the interpreters cache these, which in turn means
1188 that this needs to be moved into interpreter specific code. */
1191 ui_file_delete (gdb_stdout
);
1192 ui_file_delete (gdb_stderr
);
1197 rl_callback_handler_remove ();
1198 delete_file_handler (input_fd
);