1 /* Top level stuff for GDB, the GNU debugger.
2 Copyright 1999, 2000, 2001 Free Software Foundation, Inc.
3 Written by Elena Zannoni <ezannoni@cygnus.com> of Cygnus Solutions.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
26 #include "terminal.h" /* for job_control */
27 #include "event-loop.h"
28 #include "event-top.h"
31 /* For dont_repeat() */
34 /* readline include files */
35 #include <readline/readline.h>
36 #include <readline/history.h>
38 /* readline defines this. */
41 extern void _initialize_event_loop (void);
43 static void rl_callback_read_char_wrapper (gdb_client_data client_data
);
44 static void command_line_handler (char *rl
);
45 static void command_line_handler_continuation (struct continuation_arg
*arg
);
46 static void change_line_handler (void);
47 static void change_annotation_level (void);
48 static void command_handler (char *command
);
49 void cli_command_loop (void);
50 static void async_do_nothing (gdb_client_data arg
);
51 static void async_disconnect (gdb_client_data arg
);
52 static void async_stop_sig (gdb_client_data arg
);
53 static void async_float_handler (gdb_client_data arg
);
55 /* Signal handlers. */
56 static void handle_sigquit (int sig
);
57 static void handle_sighup (int sig
);
58 static void handle_sigfpe (int sig
);
59 #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER)
60 static void handle_sigwinch (int sig
);
63 /* Functions to be invoked by the event loop in response to
65 static void async_do_nothing (gdb_client_data
);
66 static void async_disconnect (gdb_client_data
);
67 static void async_float_handler (gdb_client_data
);
68 static void async_stop_sig (gdb_client_data
);
70 /* Readline offers an alternate interface, via callback
71 functions. These are all included in the file callback.c in the
72 readline distribution. This file provides (mainly) a function, which
73 the event loop uses as callback (i.e. event handler) whenever an event
74 is detected on the standard input file descriptor.
75 readline_callback_read_char is called (by the GDB event loop) whenever
76 there is a new character ready on the input stream. This function
77 incrementally builds a buffer internal to readline where it
78 accumulates the line read up to the point of invocation. In the
79 special case in which the character read is newline, the function
80 invokes a GDB supplied callback routine, which does the processing of
81 a full command line. This latter routine is the asynchronous analog
82 of the old command_line_input in gdb. Instead of invoking (and waiting
83 for) readline to read the command line and pass it back to
84 command_loop for processing, the new command_line_handler function has
85 the command line already available as its parameter. INPUT_HANDLER is
86 to be set to the function that readline will invoke when a complete
87 line of input is ready. CALL_READLINE is to be set to the function
88 that readline offers as callback to the event_loop. */
90 void (*input_handler
) (char *);
91 void (*call_readline
) (gdb_client_data
);
93 /* Important variables for the event loop. */
95 /* This is used to determine if GDB is using the readline library or
96 its own simplified form of readline. It is used by the asynchronous
97 form of the set editing command.
98 ezannoni: as of 1999-04-29 I expect that this
99 variable will not be used after gdb is changed to use the event
100 loop as default engine, and event-top.c is merged into top.c. */
101 int async_command_editing_p
;
103 /* This variable contains the new prompt that the user sets with the
104 set prompt command. */
105 char *new_async_prompt
;
107 /* This is the annotation suffix that will be used when the
108 annotation_level is 2. */
109 char *async_annotation_suffix
;
111 /* This is used to display the notification of the completion of an
112 asynchronous execution command. */
113 int exec_done_display_p
= 0;
115 /* This is the file descriptor for the input stream that GDB uses to
116 read commands from. */
119 /* This is the prompt stack. Prompts will be pushed on the stack as
120 needed by the different 'kinds' of user inputs GDB is asking
121 for. See event-loop.h. */
122 struct prompts the_prompts
;
124 /* signal handling variables */
125 /* Each of these is a pointer to a function that the event loop will
126 invoke if the corresponding signal has received. The real signal
127 handlers mark these functions as ready to be executed and the event
128 loop, in a later iteration, calls them. See the function
129 invoke_async_signal_handler. */
136 #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER)
137 void *sigwinch_token
;
143 /* Structure to save a partially entered command. This is used when
144 the user types '\' at the end of a command line. This is necessary
145 because each line of input is handled by a different call to
146 command_line_handler, and normally there is no state retained
147 between different calls. */
148 int more_to_come
= 0;
150 struct readline_input_state
153 char *linebuffer_ptr
;
155 readline_input_state
;
157 /* This hook is called by rl_callback_read_char_wrapper after each
158 character is processed. */
159 void (*after_char_processing_hook
) ();
162 /* Wrapper function for calling into the readline library. The event
163 loop expects the callback function to have a paramter, while readline
166 rl_callback_read_char_wrapper (gdb_client_data client_data
)
168 rl_callback_read_char ();
169 if (after_char_processing_hook
)
170 (*after_char_processing_hook
) ();
173 /* Initialize all the necessary variables, start the event loop,
174 register readline, and stdin, start the loop. */
176 cli_command_loop (void)
180 char *gdb_prompt
= get_prompt ();
182 /* If we are using readline, set things up and display the first
183 prompt, otherwise just print the prompt. */
184 if (async_command_editing_p
)
186 /* Tell readline what the prompt to display is and what function it
187 will need to call after a whole line is read. This also displays
189 length
= strlen (PREFIX (0)) + strlen (gdb_prompt
) + strlen (SUFFIX (0)) + 1;
190 a_prompt
= (char *) xmalloc (length
);
191 strcpy (a_prompt
, PREFIX (0));
192 strcat (a_prompt
, gdb_prompt
);
193 strcat (a_prompt
, SUFFIX (0));
194 rl_callback_handler_install (a_prompt
, input_handler
);
197 display_gdb_prompt (0);
199 /* Now it's time to start the event loop. */
203 /* Change the function to be invoked every time there is a character
204 ready on stdin. This is used when the user sets the editing off,
205 therefore bypassing readline, and letting gdb handle the input
206 itself, via gdb_readline2. Also it is used in the opposite case in
207 which the user sets editing on again, by restoring readline
208 handling of the input. */
210 change_line_handler (void)
212 /* NOTE: this operates on input_fd, not instream. If we are reading
213 commands from a file, instream will point to the file. However in
214 async mode, we always read commands from a file with editing
215 off. This means that the 'set editing on/off' will have effect
216 only on the interactive session. */
218 if (async_command_editing_p
)
220 /* Turn on editing by using readline. */
221 call_readline
= rl_callback_read_char_wrapper
;
222 input_handler
= command_line_handler
;
226 /* Turn off editing by using gdb_readline2. */
227 rl_callback_handler_remove ();
228 call_readline
= gdb_readline2
;
230 /* Set up the command handler as well, in case we are called as
231 first thing from .gdbinit. */
232 input_handler
= command_line_handler
;
236 /* Displays the prompt. The prompt that is displayed is the current
237 top of the prompt stack, if the argument NEW_PROMPT is
238 0. Otherwise, it displays whatever NEW_PROMPT is. This is used
239 after each gdb command has completed, and in the following cases:
240 1. when the user enters a command line which is ended by '\'
241 indicating that the command will continue on the next line.
242 In that case the prompt that is displayed is the empty string.
243 2. When the user is entering 'commands' for a breakpoint, or
244 actions for a tracepoint. In this case the prompt will be '>'
246 FIXME: 2. & 3. not implemented yet for async. */
248 display_gdb_prompt (char *new_prompt
)
250 int prompt_length
= 0;
251 char *gdb_prompt
= get_prompt ();
254 /* When an alternative interpreter has been installed, do not
255 display the comand prompt. */
260 if (target_executing
&& sync_execution
)
262 /* This is to trick readline into not trying to display the
263 prompt. Even though we display the prompt using this
264 function, readline still tries to do its own display if we
265 don't call rl_callback_handler_install and
266 rl_callback_handler_remove (which readline detects because a
267 global variable is not set). If readline did that, it could
268 mess up gdb signal handlers for SIGINT. Readline assumes
269 that between calls to rl_set_signals and rl_clear_signals gdb
270 doesn't do anything with the signal handlers. Well, that's
271 not the case, because when the target executes we change the
272 SIGINT signal handler. If we allowed readline to display the
273 prompt, the signal handler change would happen exactly
274 between the calls to the above two functions.
275 Calling rl_callback_handler_remove(), does the job. */
277 rl_callback_handler_remove ();
283 /* Just use the top of the prompt stack. */
284 prompt_length
= strlen (PREFIX (0)) +
285 strlen (SUFFIX (0)) +
286 strlen (gdb_prompt
) + 1;
288 new_prompt
= (char *) alloca (prompt_length
);
290 /* Prefix needs to have new line at end. */
291 strcpy (new_prompt
, PREFIX (0));
292 strcat (new_prompt
, gdb_prompt
);
293 /* Suffix needs to have a new line at end and \032 \032 at
295 strcat (new_prompt
, SUFFIX (0));
298 if (async_command_editing_p
)
300 rl_callback_handler_remove ();
301 rl_callback_handler_install (new_prompt
, input_handler
);
303 /* new_prompt at this point can be the top of the stack or the one passed in */
306 /* Don't use a _filtered function here. It causes the assumed
307 character position to be off, since the newline we read from
308 the user is not accounted for. */
309 fputs_unfiltered (new_prompt
, gdb_stdout
);
311 /* OBSOLETE #ifdef MPW */
312 /* OBSOLETE *//* Move to a new line so the entered line doesn't have a prompt */
313 /* OBSOLETE on the front of it. */
314 /* OBSOLETE fputs_unfiltered ("\n", gdb_stdout); */
315 /* OBSOLETE #endif *//* MPW */
316 gdb_flush (gdb_stdout
);
320 /* Used when the user requests a different annotation level, with
321 'set annotate'. It pushes a new prompt (with prefix and suffix) on top
322 of the prompt stack, if the annotation level desired is 2, otherwise
323 it pops the top of the prompt stack when we want the annotation level
324 to be the normal ones (1 or 0). */
326 change_annotation_level (void)
328 char *prefix
, *suffix
;
330 if (!PREFIX (0) || !PROMPT (0) || !SUFFIX (0))
332 /* The prompt stack has not been initialized to "", we are
333 using gdb w/o the --async switch */
334 warning ("Command has same effect as set annotate");
338 if (annotation_level
> 1)
340 if (!strcmp (PREFIX (0), "") && !strcmp (SUFFIX (0), ""))
342 /* Push a new prompt if the previous annotation_level was not >1. */
343 prefix
= (char *) alloca (strlen (async_annotation_suffix
) + 10);
344 strcpy (prefix
, "\n\032\032pre-");
345 strcat (prefix
, async_annotation_suffix
);
346 strcat (prefix
, "\n");
348 suffix
= (char *) alloca (strlen (async_annotation_suffix
) + 6);
349 strcpy (suffix
, "\n\032\032");
350 strcat (suffix
, async_annotation_suffix
);
351 strcat (suffix
, "\n");
353 push_prompt (prefix
, (char *) 0, suffix
);
358 if (strcmp (PREFIX (0), "") && strcmp (SUFFIX (0), ""))
360 /* Pop the top of the stack, we are going back to annotation < 1. */
366 /* Pushes a new prompt on the prompt stack. Each prompt has three
367 parts: prefix, prompt, suffix. Usually prefix and suffix are empty
368 strings, except when the annotation level is 2. Memory is allocated
369 within savestring for the new prompt. */
371 push_prompt (char *prefix
, char *prompt
, char *suffix
)
374 PREFIX (0) = savestring (prefix
, strlen (prefix
));
376 /* Note that this function is used by the set annotate 2
377 command. This is why we take care of saving the old prompt
378 in case a new one is not specified. */
380 PROMPT (0) = savestring (prompt
, strlen (prompt
));
382 PROMPT (0) = savestring (PROMPT (-1), strlen (PROMPT (-1)));
384 SUFFIX (0) = savestring (suffix
, strlen (suffix
));
387 /* Pops the top of the prompt stack, and frees the memory allocated for it. */
391 /* If we are not during a 'synchronous' execution command, in which
392 case, the top prompt would be empty. */
393 if (strcmp (PROMPT (0), ""))
394 /* This is for the case in which the prompt is set while the
395 annotation level is 2. The top prompt will be changed, but when
396 we return to annotation level < 2, we want that new prompt to be
397 in effect, until the user does another 'set prompt'. */
398 if (strcmp (PROMPT (0), PROMPT (-1)))
401 PROMPT (-1) = savestring (PROMPT (0), strlen (PROMPT (0)));
410 /* When there is an event ready on the stdin file desriptor, instead
411 of calling readline directly throught the callback function, or
412 instead of calling gdb_readline2, give gdb a chance to detect
413 errors and do something. */
415 stdin_event_handler (int error
, gdb_client_data client_data
)
419 printf_unfiltered ("error detected on stdin\n");
420 delete_file_handler (input_fd
);
421 discard_all_continuations ();
422 /* If stdin died, we may as well kill gdb. */
423 quit_command ((char *) 0, stdin
== instream
);
426 (*call_readline
) (client_data
);
429 /* Re-enable stdin after the end of an execution command in
430 synchronous mode, or after an error from the target, and we aborted
431 the exec operation. */
434 async_enable_stdin (void *dummy
)
436 /* See NOTE in async_disable_stdin() */
437 /* FIXME: cagney/1999-09-27: Call this before clearing
438 sync_execution. Current target_terminal_ours() implementations
439 check for sync_execution before switching the terminal. */
440 target_terminal_ours ();
445 /* Disable reads from stdin (the console) marking the command as
449 async_disable_stdin (void)
452 push_prompt ("", "", "");
453 /* FIXME: cagney/1999-09-27: At present this call is technically
454 redundant since infcmd.c and infrun.c both already call
455 target_terminal_inferior(). As the terminal handling (in
456 sync/async mode) is refined, the duplicate calls can be
457 eliminated (Here or in infcmd.c/infrun.c). */
458 target_terminal_inferior ();
459 /* Add the reinstate of stdin to the list of cleanups to be done
460 in case the target errors out and dies. These cleanups are also
461 done in case of normal successful termination of the execution
462 command, by complete_execution(). */
463 make_exec_error_cleanup (async_enable_stdin
, NULL
);
467 /* Handles a gdb command. This function is called by
468 command_line_handler, which has processed one or more input lines
470 /* NOTE: 1999-04-30 This is the asynchronous version of the command_loop
471 function. The command_loop function will be obsolete when we
472 switch to use the event loop at every execution of gdb. */
474 command_handler (char *command
)
476 struct cleanup
*old_chain
;
477 int stdin_is_tty
= ISATTY (stdin
);
478 struct continuation_arg
*arg1
;
479 struct continuation_arg
*arg2
;
480 long time_at_cmd_start
;
482 long space_at_cmd_start
= 0;
484 extern int display_time
;
485 extern int display_space
;
488 if (instream
== stdin
&& stdin_is_tty
)
489 reinitialize_more_filter ();
490 old_chain
= make_cleanup (null_cleanup
, 0);
492 /* If readline returned a NULL command, it means that the
493 connection with the terminal is gone. This happens at the
494 end of a testsuite run, after Expect has hung up
495 but GDB is still alive. In such a case, we just quit gdb
496 killing the inferior program too. */
498 quit_command ((char *) 0, stdin
== instream
);
500 time_at_cmd_start
= get_run_time ();
505 extern char **environ
;
506 char *lim
= (char *) sbrk (0);
508 space_at_cmd_start
= (long) (lim
- (char *) &environ
);
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
.integer
= time_at_cmd_start
;
526 arg2
->data
.integer
= space_at_cmd_start
;
527 add_continuation (command_line_handler_continuation
, arg1
);
530 /* Do any commands attached to breakpoint we stopped at. Only if we
531 are always running synchronously. Or if we have just executed a
532 command that doesn't start the target. */
533 if (!target_can_async_p () || !target_executing
)
535 bpstat_do_actions (&stop_bpstat
);
536 do_cleanups (old_chain
);
540 long cmd_time
= get_run_time () - time_at_cmd_start
;
542 printf_unfiltered ("Command execution time: %ld.%06ld\n",
543 cmd_time
/ 1000000, cmd_time
% 1000000);
549 extern char **environ
;
550 char *lim
= (char *) sbrk (0);
551 long space_now
= lim
- (char *) &environ
;
552 long space_diff
= space_now
- space_at_cmd_start
;
554 printf_unfiltered ("Space used: %ld (%c%ld for this command)\n",
556 (space_diff
>= 0 ? '+' : '-'),
563 /* Do any commands attached to breakpoint we stopped at. Only if we
564 are always running synchronously. Or if we have just executed a
565 command that doesn't start the target. */
567 command_line_handler_continuation (struct continuation_arg
*arg
)
569 extern int display_time
;
570 extern int display_space
;
572 long time_at_cmd_start
= arg
->data
.longint
;
573 long space_at_cmd_start
= arg
->next
->data
.longint
;
575 bpstat_do_actions (&stop_bpstat
);
576 /*do_cleanups (old_chain); *//*?????FIXME????? */
580 long cmd_time
= get_run_time () - time_at_cmd_start
;
582 printf_unfiltered ("Command execution time: %ld.%06ld\n",
583 cmd_time
/ 1000000, cmd_time
% 1000000);
588 extern char **environ
;
589 char *lim
= (char *) sbrk (0);
590 long space_now
= lim
- (char *) &environ
;
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 printf_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
)
661 ++source_line_number
;
662 sprintf (source_error
,
663 "%s%s:%d: Error in sourced command file:\n",
667 error_pre_print
= source_error
;
670 /* If we are in this case, then command_handler will call quit
671 and exit from gdb. */
672 if (!rl
|| rl
== (char *) EOF
)
677 if (strlen (rl
) + 1 + (p
- linebuffer
) > linelength
)
679 linelength
= strlen (rl
) + 1 + (p
- linebuffer
);
680 nline
= (char *) xrealloc (linebuffer
, linelength
);
681 p
+= nline
- linebuffer
;
685 /* Copy line. Don't copy null at end. (Leaves line alone
686 if this was just a newline) */
690 xfree (rl
); /* Allocated in readline. */
692 if (*(p
- 1) == '\\')
694 p
--; /* Put on top of '\'. */
698 readline_input_state
.linebuffer
= savestring (linebuffer
,
699 strlen (linebuffer
));
700 readline_input_state
.linebuffer_ptr
= p
;
702 /* We will not invoke a execute_command if there is more
703 input expected to complete the command. So, we need to
704 print an empty prompt here. */
706 push_prompt ("", "", "");
707 display_gdb_prompt (0);
714 signal (STOP_SIGNAL
, SIG_DFL
);
717 #define SERVER_COMMAND_LENGTH 7
719 (p
- linebuffer
> SERVER_COMMAND_LENGTH
)
720 && STREQN (linebuffer
, "server ", SERVER_COMMAND_LENGTH
);
723 /* Note that we don't set `line'. Between this and the check in
724 dont_repeat, this insures that repeating will still do the
727 command_handler (linebuffer
+ SERVER_COMMAND_LENGTH
);
728 display_gdb_prompt (0);
732 /* Do history expansion if that is wished. */
733 if (history_expansion_p
&& instream
== stdin
734 && ISATTY (instream
))
739 *p
= '\0'; /* Insert null now. */
740 expanded
= history_expand (linebuffer
, &history_value
);
743 /* Print the changes. */
744 printf_unfiltered ("%s\n", history_value
);
746 /* If there was an error, call this function again. */
749 xfree (history_value
);
752 if (strlen (history_value
) > linelength
)
754 linelength
= strlen (history_value
) + 1;
755 linebuffer
= (char *) xrealloc (linebuffer
, linelength
);
757 strcpy (linebuffer
, history_value
);
758 p
= linebuffer
+ strlen (linebuffer
);
759 xfree (history_value
);
763 /* If we just got an empty line, and that is supposed
764 to repeat the previous command, return the value in the
766 if (repeat
&& p
== linebuffer
&& *p
!= '\\')
768 command_handler (line
);
769 display_gdb_prompt (0);
773 for (p1
= linebuffer
; *p1
== ' ' || *p1
== '\t'; p1
++);
776 command_handler (line
);
777 display_gdb_prompt (0);
783 /* Add line to history if appropriate. */
784 if (instream
== stdin
785 && ISATTY (stdin
) && *linebuffer
)
786 add_history (linebuffer
);
788 /* Note: lines consisting solely of comments are added to the command
789 history. This is useful when you type a command, and then
790 realize you don't want to execute it quite yet. You can comment
791 out the command and then later fetch it from the value history
792 and remove the '#'. The kill ring is probably better, but some
793 people are in the habit of commenting things out. */
795 *p1
= '\0'; /* Found a comment. */
797 /* Save into global buffer if appropriate. */
800 if (linelength
> linesize
)
802 line
= xrealloc (line
, linelength
);
803 linesize
= linelength
;
805 strcpy (line
, linebuffer
);
808 command_handler (line
);
809 display_gdb_prompt (0);
814 command_handler (linebuffer
);
815 display_gdb_prompt (0);
819 /* Does reading of input from terminal w/o the editing features
820 provided by the readline library. */
822 /* NOTE: 1999-04-30 Asynchronous version of gdb_readline. gdb_readline
823 will become obsolete when the event loop is made the default
824 execution for gdb. */
826 gdb_readline2 (gdb_client_data client_data
)
831 int result_size
= 80;
832 static int done_once
= 0;
834 /* Unbuffer the input stream, so that, later on, the calls to fgetc
835 fetch only one char at the time from the stream. The fgetc's will
836 get up to the first newline, but there may be more chars in the
837 stream after '\n'. If we buffer the input and fgetc drains the
838 stream, getting stuff beyond the newline as well, a select, done
839 afterwards will not trigger. */
840 if (!done_once
&& !ISATTY (instream
))
842 setbuf (instream
, NULL
);
846 result
= (char *) xmalloc (result_size
);
848 /* We still need the while loop here, even though it would seem
849 obvious to invoke gdb_readline2 at every character entered. If
850 not using the readline library, the terminal is in cooked mode,
851 which sends the characters all at once. Poll will notice that the
852 input fd has changed state only after enter is pressed. At this
853 point we still need to fetch all the chars entered. */
857 /* Read from stdin if we are executing a user defined command.
858 This is the right thing for prompt_for_continue, at least. */
859 c
= fgetc (instream
? instream
: stdin
);
864 /* The last line does not end with a newline. Return it, and
865 if we are called again fgetc will still return EOF and
866 we'll return NULL then. */
869 (*input_handler
) (0);
873 #ifndef CRLF_SOURCE_FILES
877 if (input_index
> 0 && result
[input_index
- 1] == '\r')
883 result
[input_index
++] = c
;
884 while (input_index
>= result_size
)
887 result
= (char *) xrealloc (result
, result_size
);
891 result
[input_index
++] = '\0';
892 (*input_handler
) (result
);
896 /* Initialization of signal handlers and tokens. There is a function
897 handle_sig* for each of the signals GDB cares about. Specifically:
898 SIGINT, SIGFPE, SIGQUIT, SIGTSTP, SIGHUP, SIGWINCH. These
899 functions are the actual signal handlers associated to the signals
900 via calls to signal(). The only job for these functions is to
901 enqueue the appropriate event/procedure with the event loop. Such
902 procedures are the old signal handlers. The event loop will take
903 care of invoking the queued procedures to perform the usual tasks
904 associated with the reception of the signal. */
905 /* NOTE: 1999-04-30 This is the asynchronous version of init_signals.
906 init_signals will become obsolete as we move to have to event loop
907 as the default for gdb. */
909 async_init_signals (void)
911 signal (SIGINT
, handle_sigint
);
913 create_async_signal_handler (async_request_quit
, NULL
);
915 /* If SIGTRAP was set to SIG_IGN, then the SIG_IGN will get passed
916 to the inferior and breakpoints will be ignored. */
918 signal (SIGTRAP
, SIG_DFL
);
921 /* If we initialize SIGQUIT to SIG_IGN, then the SIG_IGN will get
922 passed to the inferior, which we don't want. It would be
923 possible to do a "signal (SIGQUIT, SIG_DFL)" after we fork, but
924 on BSD4.3 systems using vfork, that can affect the
925 GDB process as well as the inferior (the signal handling tables
926 might be in memory, shared between the two). Since we establish
927 a handler for SIGQUIT, when we call exec it will set the signal
928 to SIG_DFL for us. */
929 signal (SIGQUIT
, handle_sigquit
);
931 create_async_signal_handler (async_do_nothing
, NULL
);
933 if (signal (SIGHUP
, handle_sighup
) != SIG_IGN
)
935 create_async_signal_handler (async_disconnect
, NULL
);
938 create_async_signal_handler (async_do_nothing
, NULL
);
940 signal (SIGFPE
, handle_sigfpe
);
942 create_async_signal_handler (async_float_handler
, NULL
);
944 #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER)
945 signal (SIGWINCH
, handle_sigwinch
);
947 create_async_signal_handler (SIGWINCH_HANDLER
, NULL
);
951 create_async_signal_handler (async_stop_sig
, NULL
);
957 mark_async_signal_handler_wrapper (void *token
)
959 mark_async_signal_handler ((struct async_signal_handler
*) token
);
962 /* Tell the event loop what to do if SIGINT is received.
963 See event-signal.c. */
965 handle_sigint (int sig
)
967 signal (sig
, handle_sigint
);
969 /* If immediate_quit is set, we go ahead and process the SIGINT right
970 away, even if we usually would defer this to the event loop. The
971 assumption here is that it is safe to process ^C immediately if
972 immediate_quit is set. If we didn't, SIGINT would be really
973 processed only the next time through the event loop. To get to
974 that point, though, the command that we want to interrupt needs to
975 finish first, which is unacceptable. */
977 async_request_quit (0);
979 /* If immediate quit is not set, we process SIGINT the next time
980 through the loop, which is fine. */
981 mark_async_signal_handler_wrapper (sigint_token
);
984 /* Do the quit. All the checks have been done by the caller. */
986 async_request_quit (gdb_client_data arg
)
996 /* Tell the event loop what to do if SIGQUIT is received.
997 See event-signal.c. */
999 handle_sigquit (int sig
)
1001 mark_async_signal_handler_wrapper (sigquit_token
);
1002 signal (sig
, handle_sigquit
);
1005 /* Called by the event loop in response to a SIGQUIT. */
1007 async_do_nothing (gdb_client_data arg
)
1009 /* Empty function body. */
1013 /* Tell the event loop what to do if SIGHUP is received.
1014 See event-signal.c. */
1016 handle_sighup (int sig
)
1018 mark_async_signal_handler_wrapper (sighup_token
);
1019 signal (sig
, handle_sighup
);
1022 /* Called by the event loop to process a SIGHUP */
1024 async_disconnect (gdb_client_data arg
)
1026 catch_errors (quit_cover
, NULL
,
1027 "Could not kill the program being debugged",
1029 signal (SIGHUP
, SIG_DFL
); /*FIXME: ??????????? */
1030 kill (getpid (), SIGHUP
);
1036 handle_stop_sig (int sig
)
1038 mark_async_signal_handler_wrapper (sigtstp_token
);
1039 signal (sig
, handle_stop_sig
);
1043 async_stop_sig (gdb_client_data arg
)
1045 char *prompt
= get_prompt ();
1046 #if STOP_SIGNAL == SIGTSTP
1047 signal (SIGTSTP
, SIG_DFL
);
1048 #if HAVE_SIGPROCMASK
1052 sigemptyset (&zero
);
1053 sigprocmask (SIG_SETMASK
, &zero
, 0);
1055 #elif HAVE_SIGSETMASK
1058 kill (getpid (), SIGTSTP
);
1059 signal (SIGTSTP
, handle_stop_sig
);
1061 signal (STOP_SIGNAL
, handle_stop_sig
);
1063 printf_unfiltered ("%s", prompt
);
1064 gdb_flush (gdb_stdout
);
1066 /* Forget about any previous command -- null line now will do nothing. */
1069 #endif /* STOP_SIGNAL */
1071 /* Tell the event loop what to do if SIGFPE is received.
1072 See event-signal.c. */
1074 handle_sigfpe (int sig
)
1076 mark_async_signal_handler_wrapper (sigfpe_token
);
1077 signal (sig
, handle_sigfpe
);
1080 /* Event loop will call this functin to process a SIGFPE. */
1082 async_float_handler (gdb_client_data arg
)
1084 /* This message is based on ANSI C, section 4.7. Note that integer
1085 divide by zero causes this, so "float" is a misnomer. */
1086 error ("Erroneous arithmetic operation.");
1089 /* Tell the event loop what to do if SIGWINCH is received.
1090 See event-signal.c. */
1091 #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER)
1093 handle_sigwinch (int sig
)
1095 mark_async_signal_handler_wrapper (sigwinch_token
);
1096 signal (sig
, handle_sigwinch
);
1101 /* Called by do_setshow_command. */
1104 set_async_editing_command (char *args
, int from_tty
, struct cmd_list_element
*c
)
1106 change_line_handler ();
1109 /* Called by do_setshow_command. */
1112 set_async_annotation_level (char *args
, int from_tty
, struct cmd_list_element
*c
)
1114 change_annotation_level ();
1117 /* Called by do_setshow_command. */
1120 set_async_prompt (char *args
, int from_tty
, struct cmd_list_element
*c
)
1122 PROMPT (0) = savestring (new_async_prompt
, strlen (new_async_prompt
));
1125 /* Set things up for readline to be invoked via the alternate
1126 interface, i.e. via a callback function (rl_callback_read_char),
1127 and hook up instream to the event loop. */
1129 _initialize_event_loop (void)
1133 /* If the input stream is connected to a terminal, turn on
1135 if (ISATTY (instream
))
1137 /* Tell gdb that we will be using the readline library. This
1138 could be overwritten by a command in .gdbinit like 'set
1139 editing on' or 'off'. */
1140 async_command_editing_p
= 1;
1142 /* When a character is detected on instream by select or
1143 poll, readline will be invoked via this callback
1145 call_readline
= rl_callback_read_char_wrapper
;
1149 async_command_editing_p
= 0;
1150 call_readline
= gdb_readline2
;
1153 /* When readline has read an end-of-line character, it passes
1154 the complete line to gdb for processing. command_line_handler
1155 is the function that does this. */
1156 input_handler
= command_line_handler
;
1158 /* Tell readline to use the same input stream that gdb uses. */
1159 rl_instream
= instream
;
1161 /* Get a file descriptor for the input stream, so that we can
1162 register it with the event loop. */
1163 input_fd
= fileno (instream
);
1165 /* Tell gdb to use the cli_command_loop as the main loop. */
1166 command_loop_hook
= cli_command_loop
;
1168 /* Now we need to create the event sources for the input file
1170 /* At this point in time, this is the only event source that we
1171 register with the even loop. Another source is going to be
1172 the target program (inferior), but that must be registered
1173 only when it actually exists (I.e. after we say 'run' or
1174 after we connect to a remote target. */
1175 add_file_handler (input_fd
, stdin_event_handler
, 0);