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() */
42 /* readline include files. */
43 #include "readline/readline.h"
44 #include "readline/history.h"
46 /* readline defines this. */
49 static void rl_callback_read_char_wrapper (gdb_client_data client_data
);
50 static void command_line_handler (char *rl
);
51 static void change_line_handler (void);
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 used to display the notification of the completion of an
111 asynchronous execution command. */
112 int exec_done_display_p
= 0;
114 /* This is the file descriptor for the input stream that GDB uses to
115 read commands from. */
118 /* Used by the stdin event handler to compensate for missed stdin events.
119 Setting this to a non-zero value inside an stdin callback makes the callback
121 int call_stdin_event_handler_again_p
;
123 /* Signal handling variables. */
124 /* Each of these is a pointer to a function that the event loop will
125 invoke if the corresponding signal has received. The real signal
126 handlers mark these functions as ready to be executed and the event
127 loop, in a later iteration, calls them. See the function
128 invoke_async_signal_handler. */
129 static struct async_signal_handler
*sigint_token
;
131 static struct async_signal_handler
*sighup_token
;
134 static struct async_signal_handler
*sigquit_token
;
136 static struct async_signal_handler
*sigfpe_token
;
138 static struct async_signal_handler
*sigtstp_token
;
140 static struct async_signal_handler
*async_sigterm_token
;
142 /* This hook is called by rl_callback_read_char_wrapper after each
143 character is processed. */
144 void (*after_char_processing_hook
) (void);
147 /* Wrapper function for calling into the readline library. The event
148 loop expects the callback function to have a paramter, while
149 readline expects none. */
151 rl_callback_read_char_wrapper (gdb_client_data client_data
)
153 rl_callback_read_char ();
154 if (after_char_processing_hook
)
155 (*after_char_processing_hook
) ();
158 /* Initialize all the necessary variables, start the event loop,
159 register readline, and stdin, start the loop. The DATA is the
160 interpreter data cookie, ignored for now. */
163 cli_command_loop (void *data
)
165 display_gdb_prompt (0);
167 /* Now it's time to start the event loop. */
171 /* Change the function to be invoked every time there is a character
172 ready on stdin. This is used when the user sets the editing off,
173 therefore bypassing readline, and letting gdb handle the input
174 itself, via gdb_readline_no_editing_callback. Also it is used in
175 the opposite case in which the user sets editing on again, by
176 restoring readline handling of the input. */
178 change_line_handler (void)
180 /* NOTE: this operates on input_fd, not instream. If we are reading
181 commands from a file, instream will point to the file. However in
182 async mode, we always read commands from a file with editing
183 off. This means that the 'set editing on/off' will have effect
184 only on the interactive session. */
186 if (async_command_editing_p
)
188 /* Turn on editing by using readline. */
189 call_readline
= rl_callback_read_char_wrapper
;
190 input_handler
= command_line_handler
;
194 /* Turn off editing by using gdb_readline_no_editing_callback. */
195 gdb_rl_callback_handler_remove ();
196 call_readline
= gdb_readline_no_editing_callback
;
198 /* Set up the command handler as well, in case we are called as
199 first thing from .gdbinit. */
200 input_handler
= command_line_handler
;
204 /* The functions below are wrappers for rl_callback_handler_remove and
205 rl_callback_handler_install that keep track of whether the callback
206 handler is installed in readline. This is necessary because after
207 handling a target event of a background execution command, we may
208 need to reinstall the callback handler if it was removed due to a
209 secondary prompt. See gdb_readline_wrapper_line. We don't
210 unconditionally install the handler for every target event because
211 that also clears the line buffer, thus installing it while the user
212 is typing would lose input. */
214 /* Whether we've registered a callback handler with readline. */
215 static int callback_handler_installed
;
217 /* See event-top.h, and above. */
220 gdb_rl_callback_handler_remove (void)
222 rl_callback_handler_remove ();
223 callback_handler_installed
= 0;
226 /* See event-top.h, and above. Note this wrapper doesn't have an
227 actual callback parameter because we always install
231 gdb_rl_callback_handler_install (const char *prompt
)
233 /* Calling rl_callback_handler_install resets readline's input
234 buffer. Calling this when we were already processing input
235 therefore loses input. */
236 gdb_assert (!callback_handler_installed
);
238 rl_callback_handler_install (prompt
, input_handler
);
239 callback_handler_installed
= 1;
242 /* See event-top.h, and above. */
245 gdb_rl_callback_handler_reinstall (void)
247 if (!callback_handler_installed
)
249 /* Passing NULL as prompt argument tells readline to not display
251 gdb_rl_callback_handler_install (NULL
);
255 /* Displays the prompt. If the argument NEW_PROMPT is NULL, the
256 prompt that is displayed is the current top level prompt.
257 Otherwise, it displays whatever NEW_PROMPT is as a local/secondary
260 This is used after each gdb command has completed, and in the
263 1. When the user enters a command line which is ended by '\'
264 indicating that the command will continue on the next line. In
265 that case the prompt that is displayed is the empty string.
267 2. When the user is entering 'commands' for a breakpoint, or
268 actions for a tracepoint. In this case the prompt will be '>'
270 3. On prompting for pagination. */
273 display_gdb_prompt (const char *new_prompt
)
275 char *actual_gdb_prompt
= NULL
;
276 struct cleanup
*old_chain
;
278 annotate_display_prompt ();
280 /* Reset the nesting depth used when trace-commands is set. */
281 reset_command_nest_depth ();
283 old_chain
= make_cleanup (free_current_contents
, &actual_gdb_prompt
);
285 /* Do not call the python hook on an explicit prompt change as
286 passed to this function, as this forms a secondary/local prompt,
287 IE, displayed but not set. */
292 /* This is to trick readline into not trying to display the
293 prompt. Even though we display the prompt using this
294 function, readline still tries to do its own display if
295 we don't call rl_callback_handler_install and
296 rl_callback_handler_remove (which readline detects
297 because a global variable is not set). If readline did
298 that, it could mess up gdb signal handlers for SIGINT.
299 Readline assumes that between calls to rl_set_signals and
300 rl_clear_signals gdb doesn't do anything with the signal
301 handlers. Well, that's not the case, because when the
302 target executes we change the SIGINT signal handler. If
303 we allowed readline to display the prompt, the signal
304 handler change would happen exactly between the calls to
305 the above two functions. Calling
306 rl_callback_handler_remove(), does the job. */
308 gdb_rl_callback_handler_remove ();
309 do_cleanups (old_chain
);
314 /* Display the top level prompt. */
315 actual_gdb_prompt
= top_level_prompt ();
319 actual_gdb_prompt
= xstrdup (new_prompt
);
321 if (async_command_editing_p
)
323 gdb_rl_callback_handler_remove ();
324 gdb_rl_callback_handler_install (actual_gdb_prompt
);
326 /* new_prompt at this point can be the top of the stack or the one
327 passed in. It can't be NULL. */
330 /* Don't use a _filtered function here. It causes the assumed
331 character position to be off, since the newline we read from
332 the user is not accounted for. */
333 fputs_unfiltered (actual_gdb_prompt
, gdb_stdout
);
334 gdb_flush (gdb_stdout
);
337 do_cleanups (old_chain
);
340 /* Return the top level prompt, as specified by "set prompt", possibly
341 overriden by the python gdb.prompt_hook hook, and then composed
342 with the prompt prefix and suffix (annotations). The caller is
343 responsible for freeing the returned string. */
346 top_level_prompt (void)
350 /* Give observers a chance of changing the prompt. E.g., the python
351 `gdb.prompt_hook' is installed as an observer. */
352 observer_notify_before_prompt (get_prompt ());
354 prompt
= get_prompt ();
356 if (annotation_level
>= 2)
358 /* Prefix needs to have new line at end. */
359 const char prefix
[] = "\n\032\032pre-prompt\n";
361 /* Suffix needs to have a new line at end and \032 \032 at
363 const char suffix
[] = "\n\032\032prompt\n";
365 return concat (prefix
, prompt
, suffix
, NULL
);
368 return xstrdup (prompt
);
371 /* Get a pointer to the command line buffer. This is used to
372 construct a whole line of input from partial input. */
374 static struct buffer
*
375 get_command_line_buffer (void)
377 static struct buffer line_buffer
;
378 static int line_buffer_initialized
;
380 if (!line_buffer_initialized
)
382 buffer_init (&line_buffer
);
383 line_buffer_initialized
= 1;
389 /* When there is an event ready on the stdin file descriptor, instead
390 of calling readline directly throught the callback function, or
391 instead of calling gdb_readline_no_editing_callback, give gdb a
392 chance to detect errors and do something. */
395 stdin_event_handler (int error
, gdb_client_data client_data
)
399 printf_unfiltered (_("error detected on stdin\n"));
400 delete_file_handler (input_fd
);
401 /* If stdin died, we may as well kill gdb. */
402 quit_command ((char *) 0, stdin
== instream
);
406 /* This makes sure a ^C immediately followed by further input is
407 always processed in that order. E.g,. with input like
408 "^Cprint 1\n", the SIGINT handler runs, marks the async signal
409 handler, and then select/poll may return with stdin ready,
410 instead of -1/EINTR. The
411 gdb.base/double-prompt-target-event-error.exp test exercises
417 call_stdin_event_handler_again_p
= 0;
418 (*call_readline
) (client_data
);
419 } while (call_stdin_event_handler_again_p
!= 0);
423 /* Re-enable stdin after the end of an execution command in
424 synchronous mode, or after an error from the target, and we aborted
425 the exec operation. */
428 async_enable_stdin (void)
432 /* See NOTE in async_disable_stdin(). */
433 /* FIXME: cagney/1999-09-27: Call this before clearing
434 sync_execution. Current target_terminal_ours() implementations
435 check for sync_execution before switching the terminal. */
436 target_terminal_ours ();
441 /* Disable reads from stdin (the console) marking the command as
445 async_disable_stdin (void)
451 /* Handle a gdb command line. This function is called when
452 handle_line_of_input has concatenated one or more input lines into
456 command_handler (char *command
)
458 struct cleanup
*stat_chain
;
462 if (instream
== stdin
)
463 reinitialize_more_filter ();
465 stat_chain
= make_command_stats_cleanup (1);
467 /* Do not execute commented lines. */
468 for (c
= command
; *c
== ' ' || *c
== '\t'; c
++)
472 execute_command (command
, instream
== stdin
);
474 /* Do any commands attached to breakpoint we stopped at. */
475 bpstat_do_actions ();
478 do_cleanups (stat_chain
);
481 /* Append RL, an input line returned by readline or one of its
482 emulations, to CMD_LINE_BUFFER. Returns the command line if we
483 have a whole command line ready to be processed by the command
484 interpreter or NULL if the command line isn't complete yet (input
485 line ends in a backslash). Takes ownership of RL. */
488 command_line_append_input_line (struct buffer
*cmd_line_buffer
, char *rl
)
495 if (len
> 0 && rl
[len
- 1] == '\\')
497 /* Don't copy the backslash and wait for more. */
498 buffer_grow (cmd_line_buffer
, rl
, len
- 1);
503 /* Copy whole line including terminating null, and we're
505 buffer_grow (cmd_line_buffer
, rl
, len
+ 1);
506 cmd
= cmd_line_buffer
->buffer
;
509 /* Allocated in readline. */
515 /* Handle a line of input coming from readline.
517 If the read line ends with a continuation character (backslash),
518 save the partial input in CMD_LINE_BUFFER (except the backslash),
519 and return NULL. Otherwise, save the partial input and return a
520 pointer to CMD_LINE_BUFFER's buffer (null terminated), indicating a
521 whole command line is ready to be executed.
523 Returns EOF on end of file.
525 If REPEAT, handle command repetitions:
527 - If the input command line is NOT empty, the command returned is
528 copied into the global 'saved_command_line' var so that it can
531 - OTOH, if the input command line IS empty, return the previously
532 saved command instead of the empty input line.
536 handle_line_of_input (struct buffer
*cmd_line_buffer
,
537 char *rl
, int repeat
, char *annotation_suffix
)
545 cmd
= command_line_append_input_line (cmd_line_buffer
, rl
);
549 /* We have a complete command line now. Prepare for the next
550 command, but leave ownership of memory to the buffer . */
551 cmd_line_buffer
->used_size
= 0;
553 if (annotation_level
> 1 && instream
== stdin
)
555 printf_unfiltered (("\n\032\032post-"));
556 puts_unfiltered (annotation_suffix
);
557 printf_unfiltered (("\n"));
560 #define SERVER_COMMAND_PREFIX "server "
561 if (startswith (cmd
, SERVER_COMMAND_PREFIX
))
563 /* Note that we don't set `saved_command_line'. Between this
564 and the check in dont_repeat, this insures that repeating
565 will still do the right thing. */
566 return cmd
+ strlen (SERVER_COMMAND_PREFIX
);
569 /* Do history expansion if that is wished. */
570 if (history_expansion_p
&& instream
== stdin
571 && ISATTY (instream
))
576 expanded
= history_expand (cmd
, &history_value
);
581 /* Print the changes. */
582 printf_unfiltered ("%s\n", history_value
);
584 /* If there was an error, call this function again. */
587 xfree (history_value
);
591 /* history_expand returns an allocated string. Just replace
592 our buffer with it. */
593 len
= strlen (history_value
);
594 xfree (buffer_finish (cmd_line_buffer
));
595 cmd_line_buffer
->buffer
= history_value
;
596 cmd_line_buffer
->buffer_size
= len
+ 1;
601 /* If we just got an empty line, and that is supposed to repeat the
602 previous command, return the previously saved command. */
603 for (p1
= cmd
; *p1
== ' ' || *p1
== '\t'; p1
++)
605 if (repeat
&& *p1
== '\0')
606 return saved_command_line
;
608 /* Add command to history if appropriate. Note: lines consisting
609 solely of comments are also added to the command history. This
610 is useful when you type a command, and then realize you don't
611 want to execute it quite yet. You can comment out the command
612 and then later fetch it from the value history and remove the
613 '#'. The kill ring is probably better, but some people are in
614 the habit of commenting things out. */
615 if (*cmd
!= '\0' && input_from_terminal_p ())
616 gdb_add_history (cmd
);
618 /* Save into global buffer if appropriate. */
621 xfree (saved_command_line
);
622 saved_command_line
= xstrdup (cmd
);
623 return saved_command_line
;
629 /* Handle a complete line of input. This is called by the callback
630 mechanism within the readline library. Deal with incomplete
631 commands as well, by saving the partial input in a global
634 NOTE: This is the asynchronous version of the command_line_input
638 command_line_handler (char *rl
)
640 struct buffer
*line_buffer
= get_command_line_buffer ();
643 cmd
= handle_line_of_input (line_buffer
, rl
, instream
== stdin
, "prompt");
644 if (cmd
== (char *) EOF
)
646 /* stdin closed. The connection with the terminal is gone.
647 This happens at the end of a testsuite run, after Expect has
648 hung up but GDB is still alive. In such a case, we just quit
649 gdb killing the inferior program too. */
650 printf_unfiltered ("quit\n");
651 execute_command ("quit", stdin
== instream
);
653 else if (cmd
== NULL
)
655 /* We don't have a full line yet. Print an empty prompt. */
656 display_gdb_prompt ("");
660 command_handler (cmd
);
661 display_gdb_prompt (0);
665 /* Does reading of input from terminal w/o the editing features
666 provided by the readline library. Calls the line input handler
667 once we have a whole input line. */
670 gdb_readline_no_editing_callback (gdb_client_data client_data
)
674 struct buffer line_buffer
;
675 static int done_once
= 0;
677 buffer_init (&line_buffer
);
679 /* Unbuffer the input stream, so that, later on, the calls to fgetc
680 fetch only one char at the time from the stream. The fgetc's will
681 get up to the first newline, but there may be more chars in the
682 stream after '\n'. If we buffer the input and fgetc drains the
683 stream, getting stuff beyond the newline as well, a select, done
684 afterwards will not trigger. */
685 if (!done_once
&& !ISATTY (instream
))
687 setbuf (instream
, NULL
);
691 /* We still need the while loop here, even though it would seem
692 obvious to invoke gdb_readline_no_editing_callback at every
693 character entered. If not using the readline library, the
694 terminal is in cooked mode, which sends the characters all at
695 once. Poll will notice that the input fd has changed state only
696 after enter is pressed. At this point we still need to fetch all
697 the chars entered. */
701 /* Read from stdin if we are executing a user defined command.
702 This is the right thing for prompt_for_continue, at least. */
703 c
= fgetc (instream
? instream
: stdin
);
707 if (line_buffer
.used_size
> 0)
709 /* The last line does not end with a newline. Return it, and
710 if we are called again fgetc will still return EOF and
711 we'll return NULL then. */
714 xfree (buffer_finish (&line_buffer
));
715 (*input_handler
) (0);
721 if (line_buffer
.used_size
> 0
722 && line_buffer
.buffer
[line_buffer
.used_size
- 1] == '\r')
723 line_buffer
.used_size
--;
727 buffer_grow_char (&line_buffer
, c
);
730 buffer_grow_char (&line_buffer
, '\0');
731 result
= buffer_finish (&line_buffer
);
732 (*input_handler
) (result
);
736 /* Initialization of signal handlers and tokens. There is a function
737 handle_sig* for each of the signals GDB cares about. Specifically:
738 SIGINT, SIGFPE, SIGQUIT, SIGTSTP, SIGHUP, SIGWINCH. These
739 functions are the actual signal handlers associated to the signals
740 via calls to signal(). The only job for these functions is to
741 enqueue the appropriate event/procedure with the event loop. Such
742 procedures are the old signal handlers. The event loop will take
743 care of invoking the queued procedures to perform the usual tasks
744 associated with the reception of the signal. */
745 /* NOTE: 1999-04-30 This is the asynchronous version of init_signals.
746 init_signals will become obsolete as we move to have to event loop
747 as the default for gdb. */
749 async_init_signals (void)
751 initialize_async_signal_handlers ();
753 signal (SIGINT
, handle_sigint
);
755 create_async_signal_handler (async_request_quit
, NULL
);
756 signal (SIGTERM
, handle_sigterm
);
758 = create_async_signal_handler (async_sigterm_handler
, NULL
);
760 /* If SIGTRAP was set to SIG_IGN, then the SIG_IGN will get passed
761 to the inferior and breakpoints will be ignored. */
763 signal (SIGTRAP
, SIG_DFL
);
767 /* If we initialize SIGQUIT to SIG_IGN, then the SIG_IGN will get
768 passed to the inferior, which we don't want. It would be
769 possible to do a "signal (SIGQUIT, SIG_DFL)" after we fork, but
770 on BSD4.3 systems using vfork, that can affect the
771 GDB process as well as the inferior (the signal handling tables
772 might be in memory, shared between the two). Since we establish
773 a handler for SIGQUIT, when we call exec it will set the signal
774 to SIG_DFL for us. */
775 signal (SIGQUIT
, handle_sigquit
);
777 create_async_signal_handler (async_do_nothing
, NULL
);
780 if (signal (SIGHUP
, handle_sighup
) != SIG_IGN
)
782 create_async_signal_handler (async_disconnect
, NULL
);
785 create_async_signal_handler (async_do_nothing
, NULL
);
787 signal (SIGFPE
, handle_sigfpe
);
789 create_async_signal_handler (async_float_handler
, NULL
);
793 create_async_signal_handler (async_stop_sig
, NULL
);
797 /* Tell the event loop what to do if SIGINT is received.
798 See event-signal.c. */
800 handle_sigint (int sig
)
802 signal (sig
, handle_sigint
);
804 /* We could be running in a loop reading in symfiles or something so
805 it may be quite a while before we get back to the event loop. So
806 set quit_flag to 1 here. Then if QUIT is called before we get to
807 the event loop, we will unwind as expected. */
811 /* If immediate_quit is set, we go ahead and process the SIGINT right
812 away, even if we usually would defer this to the event loop. The
813 assumption here is that it is safe to process ^C immediately if
814 immediate_quit is set. If we didn't, SIGINT would be really
815 processed only the next time through the event loop. To get to
816 that point, though, the command that we want to interrupt needs to
817 finish first, which is unacceptable. If immediate quit is not set,
818 we process SIGINT the next time through the loop, which is fine. */
819 gdb_call_async_signal_handler (sigint_token
, immediate_quit
);
822 /* Handle GDB exit upon receiving SIGTERM if target_can_async_p (). */
825 async_sigterm_handler (gdb_client_data arg
)
827 quit_force (NULL
, stdin
== instream
);
831 volatile int sync_quit_force_run
;
833 /* Quit GDB if SIGTERM is received.
834 GDB would quit anyway, but this way it will clean up properly. */
836 handle_sigterm (int sig
)
838 signal (sig
, handle_sigterm
);
840 sync_quit_force_run
= 1;
843 mark_async_signal_handler (async_sigterm_token
);
846 /* Do the quit. All the checks have been done by the caller. */
848 async_request_quit (gdb_client_data arg
)
850 /* If the quit_flag has gotten reset back to 0 by the time we get
851 back here, that means that an exception was thrown to unwind the
852 current command before we got back to the event loop. So there
853 is no reason to call quit again here. */
855 if (check_quit_flag ())
860 /* Tell the event loop what to do if SIGQUIT is received.
861 See event-signal.c. */
863 handle_sigquit (int sig
)
865 mark_async_signal_handler (sigquit_token
);
866 signal (sig
, handle_sigquit
);
870 #if defined (SIGQUIT) || defined (SIGHUP)
871 /* Called by the event loop in response to a SIGQUIT or an
874 async_do_nothing (gdb_client_data arg
)
876 /* Empty function body. */
881 /* Tell the event loop what to do if SIGHUP is received.
882 See event-signal.c. */
884 handle_sighup (int sig
)
886 mark_async_signal_handler (sighup_token
);
887 signal (sig
, handle_sighup
);
890 /* Called by the event loop to process a SIGHUP. */
892 async_disconnect (gdb_client_data arg
)
900 CATCH (exception
, RETURN_MASK_ALL
)
902 fputs_filtered ("Could not kill the program being debugged",
904 exception_print (gdb_stderr
, exception
);
912 CATCH (exception
, RETURN_MASK_ALL
)
917 signal (SIGHUP
, SIG_DFL
); /*FIXME: ??????????? */
924 handle_stop_sig (int sig
)
926 mark_async_signal_handler (sigtstp_token
);
927 signal (sig
, handle_stop_sig
);
931 async_stop_sig (gdb_client_data arg
)
933 char *prompt
= get_prompt ();
935 #if STOP_SIGNAL == SIGTSTP
936 signal (SIGTSTP
, SIG_DFL
);
942 sigprocmask (SIG_SETMASK
, &zero
, 0);
944 #elif HAVE_SIGSETMASK
948 signal (SIGTSTP
, handle_stop_sig
);
950 signal (STOP_SIGNAL
, handle_stop_sig
);
952 printf_unfiltered ("%s", prompt
);
953 gdb_flush (gdb_stdout
);
955 /* Forget about any previous command -- null line now will do
959 #endif /* STOP_SIGNAL */
961 /* Tell the event loop what to do if SIGFPE is received.
962 See event-signal.c. */
964 handle_sigfpe (int sig
)
966 mark_async_signal_handler (sigfpe_token
);
967 signal (sig
, handle_sigfpe
);
970 /* Event loop will call this functin to process a SIGFPE. */
972 async_float_handler (gdb_client_data arg
)
974 /* This message is based on ANSI C, section 4.7. Note that integer
975 divide by zero causes this, so "float" is a misnomer. */
976 error (_("Erroneous arithmetic operation."));
980 /* Called by do_setshow_command. */
982 set_async_editing_command (char *args
, int from_tty
,
983 struct cmd_list_element
*c
)
985 change_line_handler ();
988 /* Set things up for readline to be invoked via the alternate
989 interface, i.e. via a callback function (rl_callback_read_char),
990 and hook up instream to the event loop. */
992 gdb_setup_readline (void)
994 /* This function is a noop for the sync case. The assumption is
995 that the sync setup is ALL done in gdb_init, and we would only
996 mess it up here. The sync stuff should really go away over
999 gdb_stdout
= stdio_fileopen (stdout
);
1000 gdb_stderr
= stderr_fileopen ();
1001 gdb_stdlog
= gdb_stderr
; /* for moment */
1002 gdb_stdtarg
= gdb_stderr
; /* for moment */
1003 gdb_stdtargerr
= gdb_stderr
; /* for moment */
1005 /* If the input stream is connected to a terminal, turn on
1007 if (ISATTY (instream
))
1009 /* Tell gdb that we will be using the readline library. This
1010 could be overwritten by a command in .gdbinit like 'set
1011 editing on' or 'off'. */
1012 async_command_editing_p
= 1;
1014 /* When a character is detected on instream by select or poll,
1015 readline will be invoked via this callback function. */
1016 call_readline
= rl_callback_read_char_wrapper
;
1020 async_command_editing_p
= 0;
1021 call_readline
= gdb_readline_no_editing_callback
;
1024 /* When readline has read an end-of-line character, it passes the
1025 complete line to gdb for processing; command_line_handler is the
1026 function that does this. */
1027 input_handler
= command_line_handler
;
1029 /* Tell readline to use the same input stream that gdb uses. */
1030 rl_instream
= instream
;
1032 /* Get a file descriptor for the input stream, so that we can
1033 register it with the event loop. */
1034 input_fd
= fileno (instream
);
1036 /* Now we need to create the event sources for the input file
1038 /* At this point in time, this is the only event source that we
1039 register with the even loop. Another source is going to be the
1040 target program (inferior), but that must be registered only when
1041 it actually exists (I.e. after we say 'run' or after we connect
1042 to a remote target. */
1043 add_file_handler (input_fd
, stdin_event_handler
, 0);
1046 /* Disable command input through the standard CLI channels. Used in
1047 the suspend proc for interpreters that use the standard gdb readline
1048 interface, like the cli & the mi. */
1050 gdb_disable_readline (void)
1052 /* FIXME - It is too heavyweight to delete and remake these every
1053 time you run an interpreter that needs readline. It is probably
1054 better to have the interpreters cache these, which in turn means
1055 that this needs to be moved into interpreter specific code. */
1058 ui_file_delete (gdb_stdout
);
1059 ui_file_delete (gdb_stderr
);
1062 gdb_stdtargerr
= NULL
;
1065 gdb_rl_callback_handler_remove ();
1066 delete_file_handler (input_fd
);