1 /* Top level stuff for GDB, the GNU debugger.
3 Copyright (C) 1999-2016 Free Software Foundation, Inc.
5 Written by Elena Zannoni <ezannoni@cygnus.com> of Cygnus Solutions.
7 This file is part of GDB.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>. */
27 #include "terminal.h" /* for job_control */
28 #include "event-loop.h"
29 #include "event-top.h"
32 #include "cli/cli-script.h" /* for reset_command_nest_depth */
34 #include "gdbthread.h"
36 #include "continuations.h"
37 #include "gdbcmd.h" /* for dont_repeat() */
41 /* readline include files. */
42 #include "readline/readline.h"
43 #include "readline/history.h"
45 /* readline defines this. */
48 static void rl_callback_read_char_wrapper (gdb_client_data client_data
);
49 static void command_line_handler (char *rl
);
50 static void change_line_handler (void);
51 static void command_handler (char *command
);
52 static char *top_level_prompt (void);
54 /* Signal handlers. */
56 static void handle_sigquit (int sig
);
59 static void handle_sighup (int sig
);
61 static void handle_sigfpe (int sig
);
63 /* Functions to be invoked by the event loop in response to
65 #if defined (SIGQUIT) || defined (SIGHUP)
66 static void async_do_nothing (gdb_client_data
);
69 static void async_disconnect (gdb_client_data
);
71 static void async_float_handler (gdb_client_data
);
73 static void async_stop_sig (gdb_client_data
);
75 static void async_sigterm_handler (gdb_client_data arg
);
77 /* Readline offers an alternate interface, via callback
78 functions. These are all included in the file callback.c in the
79 readline distribution. This file provides (mainly) a function, which
80 the event loop uses as callback (i.e. event handler) whenever an event
81 is detected on the standard input file descriptor.
82 readline_callback_read_char is called (by the GDB event loop) whenever
83 there is a new character ready on the input stream. This function
84 incrementally builds a buffer internal to readline where it
85 accumulates the line read up to the point of invocation. In the
86 special case in which the character read is newline, the function
87 invokes a GDB supplied callback routine, which does the processing of
88 a full command line. This latter routine is the asynchronous analog
89 of the old command_line_input in gdb. Instead of invoking (and waiting
90 for) readline to read the command line and pass it back to
91 command_loop for processing, the new command_line_handler function has
92 the command line already available as its parameter. INPUT_HANDLER is
93 to be set to the function that readline will invoke when a complete
94 line of input is ready. CALL_READLINE is to be set to the function
95 that readline offers as callback to the event_loop. */
97 void (*input_handler
) (char *);
98 void (*call_readline
) (gdb_client_data
);
100 /* Important variables for the event loop. */
102 /* This is used to determine if GDB is using the readline library or
103 its own simplified form of readline. It is used by the asynchronous
104 form of the set editing command.
105 ezannoni: as of 1999-04-29 I expect that this
106 variable will not be used after gdb is changed to use the event
107 loop as default engine, and event-top.c is merged into top.c. */
108 int async_command_editing_p
;
110 /* This is the annotation suffix that will be used when the
111 annotation_level is 2. */
112 char *async_annotation_suffix
;
114 /* This is used to display the notification of the completion of an
115 asynchronous execution command. */
116 int exec_done_display_p
= 0;
118 /* This is the file descriptor for the input stream that GDB uses to
119 read commands from. */
122 /* Used by the stdin event handler to compensate for missed stdin events.
123 Setting this to a non-zero value inside an stdin callback makes the callback
125 int call_stdin_event_handler_again_p
;
127 /* Signal handling variables. */
128 /* Each of these is a pointer to a function that the event loop will
129 invoke if the corresponding signal has received. The real signal
130 handlers mark these functions as ready to be executed and the event
131 loop, in a later iteration, calls them. See the function
132 invoke_async_signal_handler. */
133 static struct async_signal_handler
*sigint_token
;
135 static struct async_signal_handler
*sighup_token
;
138 static struct async_signal_handler
*sigquit_token
;
140 static struct async_signal_handler
*sigfpe_token
;
142 static struct async_signal_handler
*sigtstp_token
;
144 static struct async_signal_handler
*async_sigterm_token
;
146 /* Structure to save a partially entered command. This is used when
147 the user types '\' at the end of a command line. This is necessary
148 because each line of input is handled by a different call to
149 command_line_handler, and normally there is no state retained
150 between different calls. */
151 static int more_to_come
= 0;
153 struct readline_input_state
156 char *linebuffer_ptr
;
158 readline_input_state
;
160 /* This hook is called by rl_callback_read_char_wrapper after each
161 character is processed. */
162 void (*after_char_processing_hook
) (void);
165 /* Wrapper function for calling into the readline library. The event
166 loop expects the callback function to have a paramter, while
167 readline expects none. */
169 rl_callback_read_char_wrapper (gdb_client_data client_data
)
171 rl_callback_read_char ();
172 if (after_char_processing_hook
)
173 (*after_char_processing_hook
) ();
176 /* Initialize all the necessary variables, start the event loop,
177 register readline, and stdin, start the loop. The DATA is the
178 interpreter data cookie, ignored for now. */
181 cli_command_loop (void *data
)
183 display_gdb_prompt (0);
185 /* Now it's time to start the event loop. */
189 /* Change the function to be invoked every time there is a character
190 ready on stdin. This is used when the user sets the editing off,
191 therefore bypassing readline, and letting gdb handle the input
192 itself, via gdb_readline_no_editing_callback. Also it is used in
193 the opposite case in which the user sets editing on again, by
194 restoring readline handling of the input. */
196 change_line_handler (void)
198 /* NOTE: this operates on input_fd, not instream. If we are reading
199 commands from a file, instream will point to the file. However in
200 async mode, we always read commands from a file with editing
201 off. This means that the 'set editing on/off' will have effect
202 only on the interactive session. */
204 if (async_command_editing_p
)
206 /* Turn on editing by using readline. */
207 call_readline
= rl_callback_read_char_wrapper
;
208 input_handler
= command_line_handler
;
212 /* Turn off editing by using gdb_readline_no_editing_callback. */
213 gdb_rl_callback_handler_remove ();
214 call_readline
= gdb_readline_no_editing_callback
;
216 /* Set up the command handler as well, in case we are called as
217 first thing from .gdbinit. */
218 input_handler
= command_line_handler
;
222 /* The functions below are wrappers for rl_callback_handler_remove and
223 rl_callback_handler_install that keep track of whether the callback
224 handler is installed in readline. This is necessary because after
225 handling a target event of a background execution command, we may
226 need to reinstall the callback handler if it was removed due to a
227 secondary prompt. See gdb_readline_wrapper_line. We don't
228 unconditionally install the handler for every target event because
229 that also clears the line buffer, thus installing it while the user
230 is typing would lose input. */
232 /* Whether we've registered a callback handler with readline. */
233 static int callback_handler_installed
;
235 /* See event-top.h, and above. */
238 gdb_rl_callback_handler_remove (void)
240 rl_callback_handler_remove ();
241 callback_handler_installed
= 0;
244 /* See event-top.h, and above. Note this wrapper doesn't have an
245 actual callback parameter because we always install
249 gdb_rl_callback_handler_install (const char *prompt
)
251 /* Calling rl_callback_handler_install resets readline's input
252 buffer. Calling this when we were already processing input
253 therefore loses input. */
254 gdb_assert (!callback_handler_installed
);
256 rl_callback_handler_install (prompt
, input_handler
);
257 callback_handler_installed
= 1;
260 /* See event-top.h, and above. */
263 gdb_rl_callback_handler_reinstall (void)
265 if (!callback_handler_installed
)
267 /* Passing NULL as prompt argument tells readline to not display
269 gdb_rl_callback_handler_install (NULL
);
273 /* Displays the prompt. If the argument NEW_PROMPT is NULL, the
274 prompt that is displayed is the current top level prompt.
275 Otherwise, it displays whatever NEW_PROMPT is as a local/secondary
278 This is used after each gdb command has completed, and in the
281 1. When the user enters a command line which is ended by '\'
282 indicating that the command will continue on the next line. In
283 that case the prompt that is displayed is the empty string.
285 2. When the user is entering 'commands' for a breakpoint, or
286 actions for a tracepoint. In this case the prompt will be '>'
288 3. On prompting for pagination. */
291 display_gdb_prompt (const char *new_prompt
)
293 char *actual_gdb_prompt
= NULL
;
294 struct cleanup
*old_chain
;
296 annotate_display_prompt ();
298 /* Reset the nesting depth used when trace-commands is set. */
299 reset_command_nest_depth ();
301 old_chain
= make_cleanup (free_current_contents
, &actual_gdb_prompt
);
303 /* Do not call the python hook on an explicit prompt change as
304 passed to this function, as this forms a secondary/local prompt,
305 IE, displayed but not set. */
310 /* This is to trick readline into not trying to display the
311 prompt. Even though we display the prompt using this
312 function, readline still tries to do its own display if
313 we don't call rl_callback_handler_install and
314 rl_callback_handler_remove (which readline detects
315 because a global variable is not set). If readline did
316 that, it could mess up gdb signal handlers for SIGINT.
317 Readline assumes that between calls to rl_set_signals and
318 rl_clear_signals gdb doesn't do anything with the signal
319 handlers. Well, that's not the case, because when the
320 target executes we change the SIGINT signal handler. If
321 we allowed readline to display the prompt, the signal
322 handler change would happen exactly between the calls to
323 the above two functions. Calling
324 rl_callback_handler_remove(), does the job. */
326 gdb_rl_callback_handler_remove ();
327 do_cleanups (old_chain
);
332 /* Display the top level prompt. */
333 actual_gdb_prompt
= top_level_prompt ();
337 actual_gdb_prompt
= xstrdup (new_prompt
);
339 if (async_command_editing_p
)
341 gdb_rl_callback_handler_remove ();
342 gdb_rl_callback_handler_install (actual_gdb_prompt
);
344 /* new_prompt at this point can be the top of the stack or the one
345 passed in. It can't be NULL. */
348 /* Don't use a _filtered function here. It causes the assumed
349 character position to be off, since the newline we read from
350 the user is not accounted for. */
351 fputs_unfiltered (actual_gdb_prompt
, gdb_stdout
);
352 gdb_flush (gdb_stdout
);
355 do_cleanups (old_chain
);
358 /* Return the top level prompt, as specified by "set prompt", possibly
359 overriden by the python gdb.prompt_hook hook, and then composed
360 with the prompt prefix and suffix (annotations). The caller is
361 responsible for freeing the returned string. */
364 top_level_prompt (void)
369 char *composed_prompt
;
370 size_t prompt_length
;
372 /* Give observers a chance of changing the prompt. E.g., the python
373 `gdb.prompt_hook' is installed as an observer. */
374 observer_notify_before_prompt (get_prompt ());
376 prompt
= xstrdup (get_prompt ());
378 if (annotation_level
>= 2)
380 /* Prefix needs to have new line at end. */
381 prefix
= (char *) alloca (strlen (async_annotation_suffix
) + 10);
382 strcpy (prefix
, "\n\032\032pre-");
383 strcat (prefix
, async_annotation_suffix
);
384 strcat (prefix
, "\n");
386 /* Suffix needs to have a new line at end and \032 \032 at
388 suffix
= (char *) alloca (strlen (async_annotation_suffix
) + 6);
389 strcpy (suffix
, "\n\032\032");
390 strcat (suffix
, async_annotation_suffix
);
391 strcat (suffix
, "\n");
399 prompt_length
= strlen (prefix
) + strlen (prompt
) + strlen (suffix
);
400 composed_prompt
= (char *) xmalloc (prompt_length
+ 1);
402 strcpy (composed_prompt
, prefix
);
403 strcat (composed_prompt
, prompt
);
404 strcat (composed_prompt
, suffix
);
408 return composed_prompt
;
411 /* When there is an event ready on the stdin file desriptor, instead
412 of calling readline directly throught the callback function, or
413 instead of calling gdb_readline_no_editing_callback, give gdb a
414 chance to detect 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 /* If stdin died, we may as well kill gdb. */
424 quit_command ((char *) 0, stdin
== instream
);
430 call_stdin_event_handler_again_p
= 0;
431 (*call_readline
) (client_data
);
432 } while (call_stdin_event_handler_again_p
!= 0);
436 /* Re-enable stdin after the end of an execution command in
437 synchronous mode, or after an error from the target, and we aborted
438 the exec operation. */
441 async_enable_stdin (void)
445 /* See NOTE in async_disable_stdin(). */
446 /* FIXME: cagney/1999-09-27: Call this before clearing
447 sync_execution. Current target_terminal_ours() implementations
448 check for sync_execution before switching the terminal. */
449 target_terminal_ours ();
454 /* Disable reads from stdin (the console) marking the command as
458 async_disable_stdin (void)
464 /* Handles a gdb command. This function is called by
465 command_line_handler, which has processed one or more input lines
467 /* NOTE: 1999-04-30 This is the asynchronous version of the command_loop
468 function. The command_loop function will be obsolete when we
469 switch to use the event loop at every execution of gdb. */
471 command_handler (char *command
)
473 struct cleanup
*stat_chain
;
476 if (instream
== stdin
)
477 reinitialize_more_filter ();
479 /* If readline returned a NULL command, it means that the connection
480 with the terminal is gone. This happens at the end of a
481 testsuite run, after Expect has hung up but GDB is still alive.
482 In such a case, we just quit gdb killing the inferior program
486 printf_unfiltered ("quit\n");
487 execute_command ("quit", stdin
== instream
);
490 stat_chain
= make_command_stats_cleanup (1);
492 execute_command (command
, instream
== stdin
);
494 /* Do any commands attached to breakpoint we stopped at. */
495 bpstat_do_actions ();
497 do_cleanups (stat_chain
);
500 /* Handle a complete line of input. This is called by the callback
501 mechanism within the readline library. Deal with incomplete
502 commands as well, by saving the partial input in a global
505 /* NOTE: 1999-04-30 This is the asynchronous version of the
506 command_line_input function; command_line_input will become
507 obsolete once we use the event loop as the default mechanism in
510 command_line_handler (char *rl
)
512 static char *linebuffer
= 0;
513 static unsigned linelength
= 0;
517 int repeat
= (instream
== stdin
);
519 if (annotation_level
> 1 && instream
== stdin
)
521 printf_unfiltered (("\n\032\032post-"));
522 puts_unfiltered (async_annotation_suffix
);
523 printf_unfiltered (("\n"));
529 linebuffer
= (char *) xmalloc (linelength
);
530 linebuffer
[0] = '\0';
537 strcpy (linebuffer
, readline_input_state
.linebuffer
);
538 p
= readline_input_state
.linebuffer_ptr
;
539 xfree (readline_input_state
.linebuffer
);
545 signal (STOP_SIGNAL
, handle_stop_sig
);
548 /* Make sure that all output has been output. Some machines may let
549 you get away with leaving out some of the gdb_flush, but not
552 gdb_flush (gdb_stdout
);
553 gdb_flush (gdb_stderr
);
555 if (source_file_name
!= NULL
)
556 ++source_line_number
;
558 /* If we are in this case, then command_handler will call quit
559 and exit from gdb. */
560 if (!rl
|| rl
== (char *) EOF
)
565 if (strlen (rl
) + 1 + (p
- linebuffer
) > linelength
)
567 linelength
= strlen (rl
) + 1 + (p
- linebuffer
);
568 nline
= (char *) xrealloc (linebuffer
, linelength
);
569 p
+= nline
- linebuffer
;
573 /* Copy line. Don't copy null at end. (Leaves line alone
574 if this was just a newline). */
578 xfree (rl
); /* Allocated in readline. */
580 if (p
> linebuffer
&& *(p
- 1) == '\\')
583 p
--; /* Put on top of '\'. */
585 readline_input_state
.linebuffer
= xstrdup (linebuffer
);
586 readline_input_state
.linebuffer_ptr
= p
;
588 /* We will not invoke a execute_command if there is more
589 input expected to complete the command. So, we need to
590 print an empty prompt here. */
592 display_gdb_prompt ("");
598 signal (STOP_SIGNAL
, SIG_DFL
);
601 #define SERVER_COMMAND_LENGTH 7
603 (p
- linebuffer
> SERVER_COMMAND_LENGTH
)
604 && strncmp (linebuffer
, "server ", SERVER_COMMAND_LENGTH
) == 0;
607 /* Note that we don't set `line'. Between this and the check in
608 dont_repeat, this insures that repeating will still do the
611 command_handler (linebuffer
+ SERVER_COMMAND_LENGTH
);
612 display_gdb_prompt (0);
616 /* Do history expansion if that is wished. */
617 if (history_expansion_p
&& instream
== stdin
618 && ISATTY (instream
))
623 *p
= '\0'; /* Insert null now. */
624 expanded
= history_expand (linebuffer
, &history_value
);
627 /* Print the changes. */
628 printf_unfiltered ("%s\n", history_value
);
630 /* If there was an error, call this function again. */
633 xfree (history_value
);
636 if (strlen (history_value
) > linelength
)
638 linelength
= strlen (history_value
) + 1;
639 linebuffer
= (char *) xrealloc (linebuffer
, linelength
);
641 strcpy (linebuffer
, history_value
);
642 p
= linebuffer
+ strlen (linebuffer
);
644 xfree (history_value
);
647 /* If we just got an empty line, and that is supposed to repeat the
648 previous command, return the value in the global buffer. */
649 if (repeat
&& p
== linebuffer
&& *p
!= '\\')
651 command_handler (saved_command_line
);
652 display_gdb_prompt (0);
656 for (p1
= linebuffer
; *p1
== ' ' || *p1
== '\t'; p1
++);
659 command_handler (saved_command_line
);
660 display_gdb_prompt (0);
666 /* Add line to history if appropriate. */
667 if (*linebuffer
&& input_from_terminal_p ())
668 gdb_add_history (linebuffer
);
670 /* Note: lines consisting solely of comments are added to the command
671 history. This is useful when you type a command, and then
672 realize you don't want to execute it quite yet. You can comment
673 out the command and then later fetch it from the value history
674 and remove the '#'. The kill ring is probably better, but some
675 people are in the habit of commenting things out. */
677 *p1
= '\0'; /* Found a comment. */
679 /* Save into global buffer if appropriate. */
682 if (linelength
> saved_command_line_size
)
685 = (char *) xrealloc (saved_command_line
, linelength
);
686 saved_command_line_size
= linelength
;
688 strcpy (saved_command_line
, linebuffer
);
691 command_handler (saved_command_line
);
692 display_gdb_prompt (0);
697 command_handler (linebuffer
);
698 display_gdb_prompt (0);
702 /* Does reading of input from terminal w/o the editing features
703 provided by the readline library. Calls the line input handler
704 once we have a whole input line. */
707 gdb_readline_no_editing_callback (gdb_client_data client_data
)
712 int result_size
= 80;
713 static int done_once
= 0;
715 /* Unbuffer the input stream, so that, later on, the calls to fgetc
716 fetch only one char at the time from the stream. The fgetc's will
717 get up to the first newline, but there may be more chars in the
718 stream after '\n'. If we buffer the input and fgetc drains the
719 stream, getting stuff beyond the newline as well, a select, done
720 afterwards will not trigger. */
721 if (!done_once
&& !ISATTY (instream
))
723 setbuf (instream
, NULL
);
727 result
= (char *) xmalloc (result_size
);
729 /* We still need the while loop here, even though it would seem
730 obvious to invoke gdb_readline_no_editing_callback at every
731 character entered. If not using the readline library, the
732 terminal is in cooked mode, which sends the characters all at
733 once. Poll will notice that the input fd has changed state only
734 after enter is pressed. At this point we still need to fetch all
735 the chars entered. */
739 /* Read from stdin if we are executing a user defined command.
740 This is the right thing for prompt_for_continue, at least. */
741 c
= fgetc (instream
? instream
: stdin
);
746 /* The last line does not end with a newline. Return it,
747 and if we are called again fgetc will still return EOF
748 and we'll return NULL then. */
751 (*input_handler
) (0);
757 if (input_index
> 0 && result
[input_index
- 1] == '\r')
762 result
[input_index
++] = c
;
763 while (input_index
>= result_size
)
766 result
= (char *) xrealloc (result
, result_size
);
770 result
[input_index
++] = '\0';
771 (*input_handler
) (result
);
775 /* Initialization of signal handlers and tokens. There is a function
776 handle_sig* for each of the signals GDB cares about. Specifically:
777 SIGINT, SIGFPE, SIGQUIT, SIGTSTP, SIGHUP, SIGWINCH. These
778 functions are the actual signal handlers associated to the signals
779 via calls to signal(). The only job for these functions is to
780 enqueue the appropriate event/procedure with the event loop. Such
781 procedures are the old signal handlers. The event loop will take
782 care of invoking the queued procedures to perform the usual tasks
783 associated with the reception of the signal. */
784 /* NOTE: 1999-04-30 This is the asynchronous version of init_signals.
785 init_signals will become obsolete as we move to have to event loop
786 as the default for gdb. */
788 async_init_signals (void)
790 signal (SIGINT
, handle_sigint
);
792 create_async_signal_handler (async_request_quit
, NULL
);
793 signal (SIGTERM
, handle_sigterm
);
795 = create_async_signal_handler (async_sigterm_handler
, NULL
);
797 /* If SIGTRAP was set to SIG_IGN, then the SIG_IGN will get passed
798 to the inferior and breakpoints will be ignored. */
800 signal (SIGTRAP
, SIG_DFL
);
804 /* If we initialize SIGQUIT to SIG_IGN, then the SIG_IGN will get
805 passed to the inferior, which we don't want. It would be
806 possible to do a "signal (SIGQUIT, SIG_DFL)" after we fork, but
807 on BSD4.3 systems using vfork, that can affect the
808 GDB process as well as the inferior (the signal handling tables
809 might be in memory, shared between the two). Since we establish
810 a handler for SIGQUIT, when we call exec it will set the signal
811 to SIG_DFL for us. */
812 signal (SIGQUIT
, handle_sigquit
);
814 create_async_signal_handler (async_do_nothing
, NULL
);
817 if (signal (SIGHUP
, handle_sighup
) != SIG_IGN
)
819 create_async_signal_handler (async_disconnect
, NULL
);
822 create_async_signal_handler (async_do_nothing
, NULL
);
824 signal (SIGFPE
, handle_sigfpe
);
826 create_async_signal_handler (async_float_handler
, NULL
);
830 create_async_signal_handler (async_stop_sig
, NULL
);
834 /* Tell the event loop what to do if SIGINT is received.
835 See event-signal.c. */
837 handle_sigint (int sig
)
839 signal (sig
, handle_sigint
);
841 /* We could be running in a loop reading in symfiles or something so
842 it may be quite a while before we get back to the event loop. So
843 set quit_flag to 1 here. Then if QUIT is called before we get to
844 the event loop, we will unwind as expected. */
848 /* If immediate_quit is set, we go ahead and process the SIGINT right
849 away, even if we usually would defer this to the event loop. The
850 assumption here is that it is safe to process ^C immediately if
851 immediate_quit is set. If we didn't, SIGINT would be really
852 processed only the next time through the event loop. To get to
853 that point, though, the command that we want to interrupt needs to
854 finish first, which is unacceptable. If immediate quit is not set,
855 we process SIGINT the next time through the loop, which is fine. */
856 gdb_call_async_signal_handler (sigint_token
, immediate_quit
);
859 /* Handle GDB exit upon receiving SIGTERM if target_can_async_p (). */
862 async_sigterm_handler (gdb_client_data arg
)
864 quit_force (NULL
, stdin
== instream
);
868 volatile int sync_quit_force_run
;
870 /* Quit GDB if SIGTERM is received.
871 GDB would quit anyway, but this way it will clean up properly. */
873 handle_sigterm (int sig
)
875 signal (sig
, handle_sigterm
);
877 sync_quit_force_run
= 1;
880 mark_async_signal_handler (async_sigterm_token
);
883 /* Do the quit. All the checks have been done by the caller. */
885 async_request_quit (gdb_client_data arg
)
887 /* If the quit_flag has gotten reset back to 0 by the time we get
888 back here, that means that an exception was thrown to unwind the
889 current command before we got back to the event loop. So there
890 is no reason to call quit again here. */
892 if (check_quit_flag ())
897 /* Tell the event loop what to do if SIGQUIT is received.
898 See event-signal.c. */
900 handle_sigquit (int sig
)
902 mark_async_signal_handler (sigquit_token
);
903 signal (sig
, handle_sigquit
);
907 #if defined (SIGQUIT) || defined (SIGHUP)
908 /* Called by the event loop in response to a SIGQUIT or an
911 async_do_nothing (gdb_client_data arg
)
913 /* Empty function body. */
918 /* Tell the event loop what to do if SIGHUP is received.
919 See event-signal.c. */
921 handle_sighup (int sig
)
923 mark_async_signal_handler (sighup_token
);
924 signal (sig
, handle_sighup
);
927 /* Called by the event loop to process a SIGHUP. */
929 async_disconnect (gdb_client_data arg
)
937 CATCH (exception
, RETURN_MASK_ALL
)
939 fputs_filtered ("Could not kill the program being debugged",
941 exception_print (gdb_stderr
, exception
);
949 CATCH (exception
, RETURN_MASK_ALL
)
954 signal (SIGHUP
, SIG_DFL
); /*FIXME: ??????????? */
961 handle_stop_sig (int sig
)
963 mark_async_signal_handler (sigtstp_token
);
964 signal (sig
, handle_stop_sig
);
968 async_stop_sig (gdb_client_data arg
)
970 char *prompt
= get_prompt ();
972 #if STOP_SIGNAL == SIGTSTP
973 signal (SIGTSTP
, SIG_DFL
);
979 sigprocmask (SIG_SETMASK
, &zero
, 0);
981 #elif HAVE_SIGSETMASK
985 signal (SIGTSTP
, handle_stop_sig
);
987 signal (STOP_SIGNAL
, handle_stop_sig
);
989 printf_unfiltered ("%s", prompt
);
990 gdb_flush (gdb_stdout
);
992 /* Forget about any previous command -- null line now will do
996 #endif /* STOP_SIGNAL */
998 /* Tell the event loop what to do if SIGFPE is received.
999 See event-signal.c. */
1001 handle_sigfpe (int sig
)
1003 mark_async_signal_handler (sigfpe_token
);
1004 signal (sig
, handle_sigfpe
);
1007 /* Event loop will call this functin to process a SIGFPE. */
1009 async_float_handler (gdb_client_data arg
)
1011 /* This message is based on ANSI C, section 4.7. Note that integer
1012 divide by zero causes this, so "float" is a misnomer. */
1013 error (_("Erroneous arithmetic operation."));
1017 /* Called by do_setshow_command. */
1019 set_async_editing_command (char *args
, int from_tty
,
1020 struct cmd_list_element
*c
)
1022 change_line_handler ();
1025 /* Set things up for readline to be invoked via the alternate
1026 interface, i.e. via a callback function (rl_callback_read_char),
1027 and hook up instream to the event loop. */
1029 gdb_setup_readline (void)
1031 /* This function is a noop for the sync case. The assumption is
1032 that the sync setup is ALL done in gdb_init, and we would only
1033 mess it up here. The sync stuff should really go away over
1036 gdb_stdout
= stdio_fileopen (stdout
);
1037 gdb_stderr
= stderr_fileopen ();
1038 gdb_stdlog
= gdb_stderr
; /* for moment */
1039 gdb_stdtarg
= gdb_stderr
; /* for moment */
1040 gdb_stdtargerr
= gdb_stderr
; /* for moment */
1042 /* If the input stream is connected to a terminal, turn on
1044 if (ISATTY (instream
))
1046 /* Tell gdb that we will be using the readline library. This
1047 could be overwritten by a command in .gdbinit like 'set
1048 editing on' or 'off'. */
1049 async_command_editing_p
= 1;
1051 /* When a character is detected on instream by select or poll,
1052 readline will be invoked via this callback function. */
1053 call_readline
= rl_callback_read_char_wrapper
;
1057 async_command_editing_p
= 0;
1058 call_readline
= gdb_readline_no_editing_callback
;
1061 /* When readline has read an end-of-line character, it passes the
1062 complete line to gdb for processing; command_line_handler is the
1063 function that does this. */
1064 input_handler
= command_line_handler
;
1066 /* Tell readline to use the same input stream that gdb uses. */
1067 rl_instream
= instream
;
1069 /* Get a file descriptor for the input stream, so that we can
1070 register it with the event loop. */
1071 input_fd
= fileno (instream
);
1073 /* Now we need to create the event sources for the input file
1075 /* At this point in time, this is the only event source that we
1076 register with the even loop. Another source is going to be the
1077 target program (inferior), but that must be registered only when
1078 it actually exists (I.e. after we say 'run' or after we connect
1079 to a remote target. */
1080 add_file_handler (input_fd
, stdin_event_handler
, 0);
1083 /* Disable command input through the standard CLI channels. Used in
1084 the suspend proc for interpreters that use the standard gdb readline
1085 interface, like the cli & the mi. */
1087 gdb_disable_readline (void)
1089 /* FIXME - It is too heavyweight to delete and remake these every
1090 time you run an interpreter that needs readline. It is probably
1091 better to have the interpreters cache these, which in turn means
1092 that this needs to be moved into interpreter specific code. */
1095 ui_file_delete (gdb_stdout
);
1096 ui_file_delete (gdb_stderr
);
1099 gdb_stdtargerr
= NULL
;
1102 gdb_rl_callback_handler_remove ();
1103 delete_file_handler (input_fd
);