1 /* Top level stuff for GDB, the GNU debugger.
3 Copyright (C) 1999-2014 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/>. */
26 #include "terminal.h" /* for job_control */
27 #include "event-loop.h"
28 #include "event-top.h"
31 #include "exceptions.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 /* Signal handling variables. */
123 /* Each of these is a pointer to a function that the event loop will
124 invoke if the corresponding signal has received. The real signal
125 handlers mark these functions as ready to be executed and the event
126 loop, in a later iteration, calls them. See the function
127 invoke_async_signal_handler. */
128 static struct async_signal_handler
*sigint_token
;
130 static struct async_signal_handler
*sighup_token
;
133 static struct async_signal_handler
*sigquit_token
;
135 static struct async_signal_handler
*sigfpe_token
;
137 static struct async_signal_handler
*sigtstp_token
;
139 static struct async_signal_handler
*async_sigterm_token
;
141 /* Structure to save a partially entered command. This is used when
142 the user types '\' at the end of a command line. This is necessary
143 because each line of input is handled by a different call to
144 command_line_handler, and normally there is no state retained
145 between different calls. */
146 static int more_to_come
= 0;
148 struct readline_input_state
151 char *linebuffer_ptr
;
153 readline_input_state
;
155 /* This hook is called by rl_callback_read_char_wrapper after each
156 character is processed. */
157 void (*after_char_processing_hook
) (void);
160 /* Wrapper function for calling into the readline library. The event
161 loop expects the callback function to have a paramter, while
162 readline expects none. */
164 rl_callback_read_char_wrapper (gdb_client_data client_data
)
166 rl_callback_read_char ();
167 if (after_char_processing_hook
)
168 (*after_char_processing_hook
) ();
171 /* Initialize all the necessary variables, start the event loop,
172 register readline, and stdin, start the loop. The DATA is the
173 interpreter data cookie, ignored for now. */
176 cli_command_loop (void *data
)
178 display_gdb_prompt (0);
180 /* Now it's time to start the event loop. */
184 /* Change the function to be invoked every time there is a character
185 ready on stdin. This is used when the user sets the editing off,
186 therefore bypassing readline, and letting gdb handle the input
187 itself, via gdb_readline2. Also it is used in the opposite case in
188 which the user sets editing on again, by restoring readline
189 handling of the input. */
191 change_line_handler (void)
193 /* NOTE: this operates on input_fd, not instream. If we are reading
194 commands from a file, instream will point to the file. However in
195 async mode, we always read commands from a file with editing
196 off. This means that the 'set editing on/off' will have effect
197 only on the interactive session. */
199 if (async_command_editing_p
)
201 /* Turn on editing by using readline. */
202 call_readline
= rl_callback_read_char_wrapper
;
203 input_handler
= command_line_handler
;
207 /* Turn off editing by using gdb_readline2. */
208 rl_callback_handler_remove ();
209 call_readline
= gdb_readline2
;
211 /* Set up the command handler as well, in case we are called as
212 first thing from .gdbinit. */
213 input_handler
= command_line_handler
;
217 /* Displays the prompt. If the argument NEW_PROMPT is NULL, the
218 prompt that is displayed is the current top level prompt.
219 Otherwise, it displays whatever NEW_PROMPT is as a local/secondary
222 This is used after each gdb command has completed, and in the
225 1. When the user enters a command line which is ended by '\'
226 indicating that the command will continue on the next line. In
227 that case the prompt that is displayed is the empty string.
229 2. When the user is entering 'commands' for a breakpoint, or
230 actions for a tracepoint. In this case the prompt will be '>'
232 3. On prompting for pagination. */
235 display_gdb_prompt (char *new_prompt
)
237 char *actual_gdb_prompt
= NULL
;
238 struct cleanup
*old_chain
;
240 annotate_display_prompt ();
242 /* Reset the nesting depth used when trace-commands is set. */
243 reset_command_nest_depth ();
245 /* Each interpreter has its own rules on displaying the command
247 if (!current_interp_display_prompt_p ())
250 old_chain
= make_cleanup (free_current_contents
, &actual_gdb_prompt
);
252 /* Do not call the python hook on an explicit prompt change as
253 passed to this function, as this forms a secondary/local prompt,
254 IE, displayed but not set. */
259 /* This is to trick readline into not trying to display the
260 prompt. Even though we display the prompt using this
261 function, readline still tries to do its own display if
262 we don't call rl_callback_handler_install and
263 rl_callback_handler_remove (which readline detects
264 because a global variable is not set). If readline did
265 that, it could mess up gdb signal handlers for SIGINT.
266 Readline assumes that between calls to rl_set_signals and
267 rl_clear_signals gdb doesn't do anything with the signal
268 handlers. Well, that's not the case, because when the
269 target executes we change the SIGINT signal handler. If
270 we allowed readline to display the prompt, the signal
271 handler change would happen exactly between the calls to
272 the above two functions. Calling
273 rl_callback_handler_remove(), does the job. */
275 rl_callback_handler_remove ();
276 do_cleanups (old_chain
);
281 /* Display the top level prompt. */
282 actual_gdb_prompt
= top_level_prompt ();
286 actual_gdb_prompt
= xstrdup (new_prompt
);
288 if (async_command_editing_p
)
290 rl_callback_handler_remove ();
291 rl_callback_handler_install (actual_gdb_prompt
, input_handler
);
293 /* new_prompt at this point can be the top of the stack or the one
294 passed in. It can't be NULL. */
297 /* Don't use a _filtered function here. It causes the assumed
298 character position to be off, since the newline we read from
299 the user is not accounted for. */
300 fputs_unfiltered (actual_gdb_prompt
, gdb_stdout
);
301 gdb_flush (gdb_stdout
);
304 do_cleanups (old_chain
);
307 /* Return the top level prompt, as specified by "set prompt", possibly
308 overriden by the python gdb.prompt_hook hook, and then composed
309 with the prompt prefix and suffix (annotations). The caller is
310 responsible for freeing the returned string. */
313 top_level_prompt (void)
318 char *composed_prompt
;
319 size_t prompt_length
;
321 /* Give observers a chance of changing the prompt. E.g., the python
322 `gdb.prompt_hook' is installed as an observer. */
323 observer_notify_before_prompt (get_prompt ());
325 prompt
= xstrdup (get_prompt ());
327 if (annotation_level
>= 2)
329 /* Prefix needs to have new line at end. */
330 prefix
= (char *) alloca (strlen (async_annotation_suffix
) + 10);
331 strcpy (prefix
, "\n\032\032pre-");
332 strcat (prefix
, async_annotation_suffix
);
333 strcat (prefix
, "\n");
335 /* Suffix needs to have a new line at end and \032 \032 at
337 suffix
= (char *) alloca (strlen (async_annotation_suffix
) + 6);
338 strcpy (suffix
, "\n\032\032");
339 strcat (suffix
, async_annotation_suffix
);
340 strcat (suffix
, "\n");
348 prompt_length
= strlen (prefix
) + strlen (prompt
) + strlen (suffix
);
349 composed_prompt
= xmalloc (prompt_length
+ 1);
351 strcpy (composed_prompt
, prefix
);
352 strcat (composed_prompt
, prompt
);
353 strcat (composed_prompt
, suffix
);
357 return composed_prompt
;
360 /* When there is an event ready on the stdin file desriptor, instead
361 of calling readline directly throught the callback function, or
362 instead of calling gdb_readline2, give gdb a chance to detect
363 errors and do something. */
365 stdin_event_handler (int error
, gdb_client_data client_data
)
369 printf_unfiltered (_("error detected on stdin\n"));
370 delete_file_handler (input_fd
);
371 discard_all_continuations ();
372 discard_all_intermediate_continuations ();
373 /* If stdin died, we may as well kill gdb. */
374 quit_command ((char *) 0, stdin
== instream
);
377 (*call_readline
) (client_data
);
380 /* Re-enable stdin after the end of an execution command in
381 synchronous mode, or after an error from the target, and we aborted
382 the exec operation. */
385 async_enable_stdin (void)
389 /* See NOTE in async_disable_stdin(). */
390 /* FIXME: cagney/1999-09-27: Call this before clearing
391 sync_execution. Current target_terminal_ours() implementations
392 check for sync_execution before switching the terminal. */
393 target_terminal_ours ();
398 /* Disable reads from stdin (the console) marking the command as
402 async_disable_stdin (void)
408 /* Handles a gdb command. This function is called by
409 command_line_handler, which has processed one or more input lines
411 /* NOTE: 1999-04-30 This is the asynchronous version of the command_loop
412 function. The command_loop function will be obsolete when we
413 switch to use the event loop at every execution of gdb. */
415 command_handler (char *command
)
417 int stdin_is_tty
= ISATTY (stdin
);
418 struct cleanup
*stat_chain
;
421 if (instream
== stdin
&& stdin_is_tty
)
422 reinitialize_more_filter ();
424 /* If readline returned a NULL command, it means that the connection
425 with the terminal is gone. This happens at the end of a
426 testsuite run, after Expect has hung up but GDB is still alive.
427 In such a case, we just quit gdb killing the inferior program
431 printf_unfiltered ("quit\n");
432 execute_command ("quit", stdin
== instream
);
435 stat_chain
= make_command_stats_cleanup (1);
437 execute_command (command
, instream
== stdin
);
439 /* Do any commands attached to breakpoint we stopped at. */
440 bpstat_do_actions ();
442 do_cleanups (stat_chain
);
445 /* Handle a complete line of input. This is called by the callback
446 mechanism within the readline library. Deal with incomplete
447 commands as well, by saving the partial input in a global
450 /* NOTE: 1999-04-30 This is the asynchronous version of the
451 command_line_input function; command_line_input will become
452 obsolete once we use the event loop as the default mechanism in
455 command_line_handler (char *rl
)
457 static char *linebuffer
= 0;
458 static unsigned linelength
= 0;
462 int repeat
= (instream
== stdin
);
464 if (annotation_level
> 1 && instream
== stdin
)
466 printf_unfiltered (("\n\032\032post-"));
467 puts_unfiltered (async_annotation_suffix
);
468 printf_unfiltered (("\n"));
474 linebuffer
= (char *) xmalloc (linelength
);
481 strcpy (linebuffer
, readline_input_state
.linebuffer
);
482 p
= readline_input_state
.linebuffer_ptr
;
483 xfree (readline_input_state
.linebuffer
);
489 signal (STOP_SIGNAL
, handle_stop_sig
);
492 /* Make sure that all output has been output. Some machines may let
493 you get away with leaving out some of the gdb_flush, but not
496 gdb_flush (gdb_stdout
);
497 gdb_flush (gdb_stderr
);
499 if (source_file_name
!= NULL
)
500 ++source_line_number
;
502 /* If we are in this case, then command_handler will call quit
503 and exit from gdb. */
504 if (!rl
|| rl
== (char *) EOF
)
509 if (strlen (rl
) + 1 + (p
- linebuffer
) > linelength
)
511 linelength
= strlen (rl
) + 1 + (p
- linebuffer
);
512 nline
= (char *) xrealloc (linebuffer
, linelength
);
513 p
+= nline
- linebuffer
;
517 /* Copy line. Don't copy null at end. (Leaves line alone
518 if this was just a newline). */
522 xfree (rl
); /* Allocated in readline. */
524 if (p
> linebuffer
&& *(p
- 1) == '\\')
527 p
--; /* Put on top of '\'. */
529 readline_input_state
.linebuffer
= xstrdup (linebuffer
);
530 readline_input_state
.linebuffer_ptr
= p
;
532 /* We will not invoke a execute_command if there is more
533 input expected to complete the command. So, we need to
534 print an empty prompt here. */
536 display_gdb_prompt ("");
542 signal (STOP_SIGNAL
, SIG_DFL
);
545 #define SERVER_COMMAND_LENGTH 7
547 (p
- linebuffer
> SERVER_COMMAND_LENGTH
)
548 && strncmp (linebuffer
, "server ", SERVER_COMMAND_LENGTH
) == 0;
551 /* Note that we don't set `line'. Between this and the check in
552 dont_repeat, this insures that repeating will still do the
555 command_handler (linebuffer
+ SERVER_COMMAND_LENGTH
);
556 display_gdb_prompt (0);
560 /* Do history expansion if that is wished. */
561 if (history_expansion_p
&& instream
== stdin
562 && ISATTY (instream
))
567 *p
= '\0'; /* Insert null now. */
568 expanded
= history_expand (linebuffer
, &history_value
);
571 /* Print the changes. */
572 printf_unfiltered ("%s\n", history_value
);
574 /* If there was an error, call this function again. */
577 xfree (history_value
);
580 if (strlen (history_value
) > linelength
)
582 linelength
= strlen (history_value
) + 1;
583 linebuffer
= (char *) xrealloc (linebuffer
, linelength
);
585 strcpy (linebuffer
, history_value
);
586 p
= linebuffer
+ strlen (linebuffer
);
588 xfree (history_value
);
591 /* If we just got an empty line, and that is supposed to repeat the
592 previous command, return the value in the global buffer. */
593 if (repeat
&& p
== linebuffer
&& *p
!= '\\')
595 command_handler (saved_command_line
);
596 display_gdb_prompt (0);
600 for (p1
= linebuffer
; *p1
== ' ' || *p1
== '\t'; p1
++);
603 command_handler (saved_command_line
);
604 display_gdb_prompt (0);
610 /* Add line to history if appropriate. */
611 if (*linebuffer
&& input_from_terminal_p ())
612 add_history (linebuffer
);
614 /* Note: lines consisting solely of comments are added to the command
615 history. This is useful when you type a command, and then
616 realize you don't want to execute it quite yet. You can comment
617 out the command and then later fetch it from the value history
618 and remove the '#'. The kill ring is probably better, but some
619 people are in the habit of commenting things out. */
621 *p1
= '\0'; /* Found a comment. */
623 /* Save into global buffer if appropriate. */
626 if (linelength
> saved_command_line_size
)
628 saved_command_line
= xrealloc (saved_command_line
, linelength
);
629 saved_command_line_size
= linelength
;
631 strcpy (saved_command_line
, linebuffer
);
634 command_handler (saved_command_line
);
635 display_gdb_prompt (0);
640 command_handler (linebuffer
);
641 display_gdb_prompt (0);
645 /* Does reading of input from terminal w/o the editing features
646 provided by the readline library. */
648 /* NOTE: 1999-04-30 Asynchronous version of gdb_readline; gdb_readline
649 will become obsolete when the event loop is made the default
650 execution for gdb. */
652 gdb_readline2 (gdb_client_data client_data
)
657 int result_size
= 80;
658 static int done_once
= 0;
660 /* Unbuffer the input stream, so that, later on, the calls to fgetc
661 fetch only one char at the time from the stream. The fgetc's will
662 get up to the first newline, but there may be more chars in the
663 stream after '\n'. If we buffer the input and fgetc drains the
664 stream, getting stuff beyond the newline as well, a select, done
665 afterwards will not trigger. */
666 if (!done_once
&& !ISATTY (instream
))
668 setbuf (instream
, NULL
);
672 result
= (char *) xmalloc (result_size
);
674 /* We still need the while loop here, even though it would seem
675 obvious to invoke gdb_readline2 at every character entered. If
676 not using the readline library, the terminal is in cooked mode,
677 which sends the characters all at once. Poll will notice that the
678 input fd has changed state only after enter is pressed. At this
679 point we still need to fetch all the chars entered. */
683 /* Read from stdin if we are executing a user defined command.
684 This is the right thing for prompt_for_continue, at least. */
685 c
= fgetc (instream
? instream
: stdin
);
690 /* The last line does not end with a newline. Return it,
691 and if we are called again fgetc will still return EOF
692 and we'll return NULL then. */
695 (*input_handler
) (0);
701 if (input_index
> 0 && result
[input_index
- 1] == '\r')
706 result
[input_index
++] = c
;
707 while (input_index
>= result_size
)
710 result
= (char *) xrealloc (result
, result_size
);
714 result
[input_index
++] = '\0';
715 (*input_handler
) (result
);
719 /* Initialization of signal handlers and tokens. There is a function
720 handle_sig* for each of the signals GDB cares about. Specifically:
721 SIGINT, SIGFPE, SIGQUIT, SIGTSTP, SIGHUP, SIGWINCH. These
722 functions are the actual signal handlers associated to the signals
723 via calls to signal(). The only job for these functions is to
724 enqueue the appropriate event/procedure with the event loop. Such
725 procedures are the old signal handlers. The event loop will take
726 care of invoking the queued procedures to perform the usual tasks
727 associated with the reception of the signal. */
728 /* NOTE: 1999-04-30 This is the asynchronous version of init_signals.
729 init_signals will become obsolete as we move to have to event loop
730 as the default for gdb. */
732 async_init_signals (void)
734 signal (SIGINT
, handle_sigint
);
736 create_async_signal_handler (async_request_quit
, NULL
);
737 signal (SIGTERM
, handle_sigterm
);
739 = create_async_signal_handler (async_sigterm_handler
, NULL
);
741 /* If SIGTRAP was set to SIG_IGN, then the SIG_IGN will get passed
742 to the inferior and breakpoints will be ignored. */
744 signal (SIGTRAP
, SIG_DFL
);
748 /* If we initialize SIGQUIT to SIG_IGN, then the SIG_IGN will get
749 passed to the inferior, which we don't want. It would be
750 possible to do a "signal (SIGQUIT, SIG_DFL)" after we fork, but
751 on BSD4.3 systems using vfork, that can affect the
752 GDB process as well as the inferior (the signal handling tables
753 might be in memory, shared between the two). Since we establish
754 a handler for SIGQUIT, when we call exec it will set the signal
755 to SIG_DFL for us. */
756 signal (SIGQUIT
, handle_sigquit
);
758 create_async_signal_handler (async_do_nothing
, NULL
);
761 if (signal (SIGHUP
, handle_sighup
) != SIG_IGN
)
763 create_async_signal_handler (async_disconnect
, NULL
);
766 create_async_signal_handler (async_do_nothing
, NULL
);
768 signal (SIGFPE
, handle_sigfpe
);
770 create_async_signal_handler (async_float_handler
, NULL
);
774 create_async_signal_handler (async_stop_sig
, NULL
);
778 /* Tell the event loop what to do if SIGINT is received.
779 See event-signal.c. */
781 handle_sigint (int sig
)
783 signal (sig
, handle_sigint
);
785 /* We could be running in a loop reading in symfiles or something so
786 it may be quite a while before we get back to the event loop. So
787 set quit_flag to 1 here. Then if QUIT is called before we get to
788 the event loop, we will unwind as expected. */
792 /* If immediate_quit is set, we go ahead and process the SIGINT right
793 away, even if we usually would defer this to the event loop. The
794 assumption here is that it is safe to process ^C immediately if
795 immediate_quit is set. If we didn't, SIGINT would be really
796 processed only the next time through the event loop. To get to
797 that point, though, the command that we want to interrupt needs to
798 finish first, which is unacceptable. If immediate quit is not set,
799 we process SIGINT the next time through the loop, which is fine. */
800 gdb_call_async_signal_handler (sigint_token
, immediate_quit
);
803 /* Handle GDB exit upon receiving SIGTERM if target_can_async_p (). */
806 async_sigterm_handler (gdb_client_data arg
)
808 quit_force (NULL
, stdin
== instream
);
812 volatile int sync_quit_force_run
;
814 /* Quit GDB if SIGTERM is received.
815 GDB would quit anyway, but this way it will clean up properly. */
817 handle_sigterm (int sig
)
819 signal (sig
, handle_sigterm
);
821 /* Call quit_force in a signal safe way.
822 quit_force itself is not signal safe. */
823 if (target_can_async_p ())
824 mark_async_signal_handler (async_sigterm_token
);
827 sync_quit_force_run
= 1;
832 /* Do the quit. All the checks have been done by the caller. */
834 async_request_quit (gdb_client_data arg
)
836 /* If the quit_flag has gotten reset back to 0 by the time we get
837 back here, that means that an exception was thrown to unwind the
838 current command before we got back to the event loop. So there
839 is no reason to call quit again here. */
841 if (check_quit_flag ())
846 /* Tell the event loop what to do if SIGQUIT is received.
847 See event-signal.c. */
849 handle_sigquit (int sig
)
851 mark_async_signal_handler (sigquit_token
);
852 signal (sig
, handle_sigquit
);
856 #if defined (SIGQUIT) || defined (SIGHUP)
857 /* Called by the event loop in response to a SIGQUIT or an
860 async_do_nothing (gdb_client_data arg
)
862 /* Empty function body. */
867 /* Tell the event loop what to do if SIGHUP is received.
868 See event-signal.c. */
870 handle_sighup (int sig
)
872 mark_async_signal_handler (sighup_token
);
873 signal (sig
, handle_sighup
);
876 /* Called by the event loop to process a SIGHUP. */
878 async_disconnect (gdb_client_data arg
)
880 volatile struct gdb_exception exception
;
882 TRY_CATCH (exception
, RETURN_MASK_ALL
)
887 if (exception
.reason
< 0)
889 fputs_filtered ("Could not kill the program being debugged",
891 exception_print (gdb_stderr
, exception
);
894 TRY_CATCH (exception
, RETURN_MASK_ALL
)
899 signal (SIGHUP
, SIG_DFL
); /*FIXME: ??????????? */
906 handle_stop_sig (int sig
)
908 mark_async_signal_handler (sigtstp_token
);
909 signal (sig
, handle_stop_sig
);
913 async_stop_sig (gdb_client_data arg
)
915 char *prompt
= get_prompt ();
917 #if STOP_SIGNAL == SIGTSTP
918 signal (SIGTSTP
, SIG_DFL
);
924 sigprocmask (SIG_SETMASK
, &zero
, 0);
926 #elif HAVE_SIGSETMASK
930 signal (SIGTSTP
, handle_stop_sig
);
932 signal (STOP_SIGNAL
, handle_stop_sig
);
934 printf_unfiltered ("%s", prompt
);
935 gdb_flush (gdb_stdout
);
937 /* Forget about any previous command -- null line now will do
941 #endif /* STOP_SIGNAL */
943 /* Tell the event loop what to do if SIGFPE is received.
944 See event-signal.c. */
946 handle_sigfpe (int sig
)
948 mark_async_signal_handler (sigfpe_token
);
949 signal (sig
, handle_sigfpe
);
952 /* Event loop will call this functin to process a SIGFPE. */
954 async_float_handler (gdb_client_data arg
)
956 /* This message is based on ANSI C, section 4.7. Note that integer
957 divide by zero causes this, so "float" is a misnomer. */
958 error (_("Erroneous arithmetic operation."));
962 /* Called by do_setshow_command. */
964 set_async_editing_command (char *args
, int from_tty
,
965 struct cmd_list_element
*c
)
967 change_line_handler ();
970 /* Set things up for readline to be invoked via the alternate
971 interface, i.e. via a callback function (rl_callback_read_char),
972 and hook up instream to the event loop. */
974 gdb_setup_readline (void)
976 /* This function is a noop for the sync case. The assumption is
977 that the sync setup is ALL done in gdb_init, and we would only
978 mess it up here. The sync stuff should really go away over
981 gdb_stdout
= stdio_fileopen (stdout
);
982 gdb_stderr
= stderr_fileopen ();
983 gdb_stdlog
= gdb_stderr
; /* for moment */
984 gdb_stdtarg
= gdb_stderr
; /* for moment */
985 gdb_stdtargerr
= gdb_stderr
; /* for moment */
987 /* If the input stream is connected to a terminal, turn on
989 if (ISATTY (instream
))
991 /* Tell gdb that we will be using the readline library. This
992 could be overwritten by a command in .gdbinit like 'set
993 editing on' or 'off'. */
994 async_command_editing_p
= 1;
996 /* When a character is detected on instream by select or poll,
997 readline will be invoked via this callback function. */
998 call_readline
= rl_callback_read_char_wrapper
;
1002 async_command_editing_p
= 0;
1003 call_readline
= gdb_readline2
;
1006 /* When readline has read an end-of-line character, it passes the
1007 complete line to gdb for processing; command_line_handler is the
1008 function that does this. */
1009 input_handler
= command_line_handler
;
1011 /* Tell readline to use the same input stream that gdb uses. */
1012 rl_instream
= instream
;
1014 /* Get a file descriptor for the input stream, so that we can
1015 register it with the event loop. */
1016 input_fd
= fileno (instream
);
1018 /* Now we need to create the event sources for the input file
1020 /* At this point in time, this is the only event source that we
1021 register with the even loop. Another source is going to be the
1022 target program (inferior), but that must be registered only when
1023 it actually exists (I.e. after we say 'run' or after we connect
1024 to a remote target. */
1025 add_file_handler (input_fd
, stdin_event_handler
, 0);
1028 /* Disable command input through the standard CLI channels. Used in
1029 the suspend proc for interpreters that use the standard gdb readline
1030 interface, like the cli & the mi. */
1032 gdb_disable_readline (void)
1034 /* FIXME - It is too heavyweight to delete and remake these every
1035 time you run an interpreter that needs readline. It is probably
1036 better to have the interpreters cache these, which in turn means
1037 that this needs to be moved into interpreter specific code. */
1040 ui_file_delete (gdb_stdout
);
1041 ui_file_delete (gdb_stderr
);
1044 gdb_stdtargerr
= NULL
;
1047 rl_callback_handler_remove ();
1048 delete_file_handler (input_fd
);