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
;
158 /* Wrapper function for calling into the readline library. The event
159 loop expects the callback function to have a paramter, while readline
162 rl_callback_read_char_wrapper (gdb_client_data client_data
)
164 rl_callback_read_char ();
167 /* Initialize all the necessary variables, start the event loop,
168 register readline, and stdin, start the loop. */
170 cli_command_loop (void)
174 char *gdb_prompt
= get_prompt ();
176 /* If we are using readline, set things up and display the first
177 prompt, otherwise just print the prompt. */
178 if (async_command_editing_p
)
180 /* Tell readline what the prompt to display is and what function it
181 will need to call after a whole line is read. This also displays
183 length
= strlen (PREFIX (0)) + strlen (gdb_prompt
) + strlen (SUFFIX (0)) + 1;
184 a_prompt
= (char *) xmalloc (length
);
185 strcpy (a_prompt
, PREFIX (0));
186 strcat (a_prompt
, gdb_prompt
);
187 strcat (a_prompt
, SUFFIX (0));
188 rl_callback_handler_install (a_prompt
, input_handler
);
191 display_gdb_prompt (0);
193 /* Now it's time to start the event loop. */
197 /* Change the function to be invoked every time there is a character
198 ready on stdin. This is used when the user sets the editing off,
199 therefore bypassing readline, and letting gdb handle the input
200 itself, via gdb_readline2. Also it is used in the opposite case in
201 which the user sets editing on again, by restoring readline
202 handling of the input. */
204 change_line_handler (void)
206 /* NOTE: this operates on input_fd, not instream. If we are reading
207 commands from a file, instream will point to the file. However in
208 async mode, we always read commands from a file with editing
209 off. This means that the 'set editing on/off' will have effect
210 only on the interactive session. */
212 if (async_command_editing_p
)
214 /* Turn on editing by using readline. */
215 call_readline
= rl_callback_read_char_wrapper
;
216 input_handler
= command_line_handler
;
220 /* Turn off editing by using gdb_readline2. */
221 rl_callback_handler_remove ();
222 call_readline
= gdb_readline2
;
224 /* Set up the command handler as well, in case we are called as
225 first thing from .gdbinit. */
226 input_handler
= command_line_handler
;
230 /* Displays the prompt. The prompt that is displayed is the current
231 top of the prompt stack, if the argument NEW_PROMPT is
232 0. Otherwise, it displays whatever NEW_PROMPT is. This is used
233 after each gdb command has completed, and in the following cases:
234 1. when the user enters a command line which is ended by '\'
235 indicating that the command will continue on the next line.
236 In that case the prompt that is displayed is the empty string.
237 2. When the user is entering 'commands' for a breakpoint, or
238 actions for a tracepoint. In this case the prompt will be '>'
240 FIXME: 2. & 3. not implemented yet for async. */
242 display_gdb_prompt (char *new_prompt
)
244 int prompt_length
= 0;
245 char *gdb_prompt
= get_prompt ();
248 /* When an alternative interpreter has been installed, do not
249 display the comand prompt. */
254 if (target_executing
&& sync_execution
)
256 /* This is to trick readline into not trying to display the
257 prompt. Even though we display the prompt using this
258 function, readline still tries to do its own display if we
259 don't call rl_callback_handler_install and
260 rl_callback_handler_remove (which readline detects because a
261 global variable is not set). If readline did that, it could
262 mess up gdb signal handlers for SIGINT. Readline assumes
263 that between calls to rl_set_signals and rl_clear_signals gdb
264 doesn't do anything with the signal handlers. Well, that's
265 not the case, because when the target executes we change the
266 SIGINT signal handler. If we allowed readline to display the
267 prompt, the signal handler change would happen exactly
268 between the calls to the above two functions.
269 Calling rl_callback_handler_remove(), does the job. */
271 rl_callback_handler_remove ();
277 /* Just use the top of the prompt stack. */
278 prompt_length
= strlen (PREFIX (0)) +
279 strlen (SUFFIX (0)) +
280 strlen (gdb_prompt
) + 1;
282 new_prompt
= (char *) alloca (prompt_length
);
284 /* Prefix needs to have new line at end. */
285 strcpy (new_prompt
, PREFIX (0));
286 strcat (new_prompt
, gdb_prompt
);
287 /* Suffix needs to have a new line at end and \032 \032 at
289 strcat (new_prompt
, SUFFIX (0));
292 if (async_command_editing_p
)
294 rl_callback_handler_remove ();
295 rl_callback_handler_install (new_prompt
, input_handler
);
297 /* new_prompt at this point can be the top of the stack or the one passed in */
300 /* Don't use a _filtered function here. It causes the assumed
301 character position to be off, since the newline we read from
302 the user is not accounted for. */
303 fputs_unfiltered (new_prompt
, gdb_stdout
);
305 /* OBSOLETE #ifdef MPW */
306 /* OBSOLETE *//* Move to a new line so the entered line doesn't have a prompt */
307 /* OBSOLETE on the front of it. */
308 /* OBSOLETE fputs_unfiltered ("\n", gdb_stdout); */
309 /* OBSOLETE #endif *//* MPW */
310 gdb_flush (gdb_stdout
);
314 /* Used when the user requests a different annotation level, with
315 'set annotate'. It pushes a new prompt (with prefix and suffix) on top
316 of the prompt stack, if the annotation level desired is 2, otherwise
317 it pops the top of the prompt stack when we want the annotation level
318 to be the normal ones (1 or 0). */
320 change_annotation_level (void)
322 char *prefix
, *suffix
;
324 if (!PREFIX (0) || !PROMPT (0) || !SUFFIX (0))
326 /* The prompt stack has not been initialized to "", we are
327 using gdb w/o the --async switch */
328 warning ("Command has same effect as set annotate");
332 if (annotation_level
> 1)
334 if (!strcmp (PREFIX (0), "") && !strcmp (SUFFIX (0), ""))
336 /* Push a new prompt if the previous annotation_level was not >1. */
337 prefix
= (char *) alloca (strlen (async_annotation_suffix
) + 10);
338 strcpy (prefix
, "\n\032\032pre-");
339 strcat (prefix
, async_annotation_suffix
);
340 strcat (prefix
, "\n");
342 suffix
= (char *) alloca (strlen (async_annotation_suffix
) + 6);
343 strcpy (suffix
, "\n\032\032");
344 strcat (suffix
, async_annotation_suffix
);
345 strcat (suffix
, "\n");
347 push_prompt (prefix
, (char *) 0, suffix
);
352 if (strcmp (PREFIX (0), "") && strcmp (SUFFIX (0), ""))
354 /* Pop the top of the stack, we are going back to annotation < 1. */
360 /* Pushes a new prompt on the prompt stack. Each prompt has three
361 parts: prefix, prompt, suffix. Usually prefix and suffix are empty
362 strings, except when the annotation level is 2. Memory is allocated
363 within savestring for the new prompt. */
365 push_prompt (char *prefix
, char *prompt
, char *suffix
)
368 PREFIX (0) = savestring (prefix
, strlen (prefix
));
370 /* Note that this function is used by the set annotate 2
371 command. This is why we take care of saving the old prompt
372 in case a new one is not specified. */
374 PROMPT (0) = savestring (prompt
, strlen (prompt
));
376 PROMPT (0) = savestring (PROMPT (-1), strlen (PROMPT (-1)));
378 SUFFIX (0) = savestring (suffix
, strlen (suffix
));
381 /* Pops the top of the prompt stack, and frees the memory allocated for it. */
385 /* If we are not during a 'synchronous' execution command, in which
386 case, the top prompt would be empty. */
387 if (strcmp (PROMPT (0), ""))
388 /* This is for the case in which the prompt is set while the
389 annotation level is 2. The top prompt will be changed, but when
390 we return to annotation level < 2, we want that new prompt to be
391 in effect, until the user does another 'set prompt'. */
392 if (strcmp (PROMPT (0), PROMPT (-1)))
395 PROMPT (-1) = savestring (PROMPT (0), strlen (PROMPT (0)));
404 /* When there is an event ready on the stdin file desriptor, instead
405 of calling readline directly throught the callback function, or
406 instead of calling gdb_readline2, give gdb a chance to detect
407 errors and do something. */
409 stdin_event_handler (int error
, gdb_client_data client_data
)
413 printf_unfiltered ("error detected on stdin\n");
414 delete_file_handler (input_fd
);
415 discard_all_continuations ();
416 /* If stdin died, we may as well kill gdb. */
417 quit_command ((char *) 0, stdin
== instream
);
420 (*call_readline
) (client_data
);
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 *dummy
)
430 /* See NOTE in async_disable_stdin() */
431 /* FIXME: cagney/1999-09-27: Call this before clearing
432 sync_execution. Current target_terminal_ours() implementations
433 check for sync_execution before switching the terminal. */
434 target_terminal_ours ();
439 /* Disable reads from stdin (the console) marking the command as
443 async_disable_stdin (void)
446 push_prompt ("", "", "");
447 /* FIXME: cagney/1999-09-27: At present this call is technically
448 redundant since infcmd.c and infrun.c both already call
449 target_terminal_inferior(). As the terminal handling (in
450 sync/async mode) is refined, the duplicate calls can be
451 eliminated (Here or in infcmd.c/infrun.c). */
452 target_terminal_inferior ();
453 /* Add the reinstate of stdin to the list of cleanups to be done
454 in case the target errors out and dies. These cleanups are also
455 done in case of normal successful termination of the execution
456 command, by complete_execution(). */
457 make_exec_error_cleanup (async_enable_stdin
, NULL
);
461 /* Handles a gdb command. This function is called by
462 command_line_handler, which has processed one or more input lines
464 /* NOTE: 1999-04-30 This is the asynchronous version of the command_loop
465 function. The command_loop function will be obsolete when we
466 switch to use the event loop at every execution of gdb. */
468 command_handler (char *command
)
470 struct cleanup
*old_chain
;
471 int stdin_is_tty
= ISATTY (stdin
);
472 struct continuation_arg
*arg1
;
473 struct continuation_arg
*arg2
;
474 long time_at_cmd_start
;
476 long space_at_cmd_start
= 0;
478 extern int display_time
;
479 extern int display_space
;
482 extern int insert_mode
;
486 if (instream
== stdin
&& stdin_is_tty
)
487 reinitialize_more_filter ();
488 old_chain
= make_cleanup (null_cleanup
, 0);
493 /* If readline returned a NULL command, it means that the
494 connection with the terminal is gone. This happens at the
495 end of a testsuite run, after Expect has hung up
496 but GDB is still alive. In such a case, we just quit gdb
497 killing the inferior program too. */
499 quit_command ((char *) 0, stdin
== instream
);
501 time_at_cmd_start
= get_run_time ();
506 extern char **environ
;
507 char *lim
= (char *) sbrk (0);
509 space_at_cmd_start
= (long) (lim
- (char *) &environ
);
513 execute_command (command
, instream
== stdin
);
515 /* Set things up for this function to be compete later, once the
516 execution has completed, if we are doing an execution command,
517 otherwise, just go ahead and finish. */
518 if (target_can_async_p () && target_executing
)
521 (struct continuation_arg
*) xmalloc (sizeof (struct continuation_arg
));
523 (struct continuation_arg
*) xmalloc (sizeof (struct continuation_arg
));
526 arg1
->data
.integer
= time_at_cmd_start
;
527 arg2
->data
.integer
= space_at_cmd_start
;
528 add_continuation (command_line_handler_continuation
, arg1
);
531 /* Do any commands attached to breakpoint we stopped at. Only if we
532 are always running synchronously. Or if we have just executed a
533 command that doesn't start the target. */
534 if (!target_can_async_p () || !target_executing
)
536 bpstat_do_actions (&stop_bpstat
);
537 do_cleanups (old_chain
);
541 long cmd_time
= get_run_time () - time_at_cmd_start
;
543 printf_unfiltered ("Command execution time: %ld.%06ld\n",
544 cmd_time
/ 1000000, cmd_time
% 1000000);
550 extern char **environ
;
551 char *lim
= (char *) sbrk (0);
552 long space_now
= lim
- (char *) &environ
;
553 long space_diff
= space_now
- space_at_cmd_start
;
555 printf_unfiltered ("Space used: %ld (%c%ld for this command)\n",
557 (space_diff
>= 0 ? '+' : '-'),
564 /* Do any commands attached to breakpoint we stopped at. Only if we
565 are always running synchronously. Or if we have just executed a
566 command that doesn't start the target. */
568 command_line_handler_continuation (struct continuation_arg
*arg
)
570 extern int display_time
;
571 extern int display_space
;
573 long time_at_cmd_start
= arg
->data
.longint
;
574 long space_at_cmd_start
= arg
->next
->data
.longint
;
576 bpstat_do_actions (&stop_bpstat
);
577 /*do_cleanups (old_chain); *//*?????FIXME????? */
581 long cmd_time
= get_run_time () - time_at_cmd_start
;
583 printf_unfiltered ("Command execution time: %ld.%06ld\n",
584 cmd_time
/ 1000000, cmd_time
% 1000000);
589 extern char **environ
;
590 char *lim
= (char *) sbrk (0);
591 long space_now
= lim
- (char *) &environ
;
592 long space_diff
= space_now
- space_at_cmd_start
;
594 printf_unfiltered ("Space used: %ld (%c%ld for this command)\n",
596 (space_diff
>= 0 ? '+' : '-'),
602 /* Handle a complete line of input. This is called by the callback
603 mechanism within the readline library. Deal with incomplete commands
604 as well, by saving the partial input in a global buffer. */
606 /* NOTE: 1999-04-30 This is the asynchronous version of the
607 command_line_input function. command_line_input will become
608 obsolete once we use the event loop as the default mechanism in
611 command_line_handler (char *rl
)
613 static char *linebuffer
= 0;
614 static unsigned linelength
= 0;
623 int repeat
= (instream
== stdin
);
625 if (annotation_level
> 1 && instream
== stdin
)
627 printf_unfiltered ("\n\032\032post-");
628 printf_unfiltered (async_annotation_suffix
);
629 printf_unfiltered ("\n");
635 linebuffer
= (char *) xmalloc (linelength
);
642 strcpy (linebuffer
, readline_input_state
.linebuffer
);
643 p
= readline_input_state
.linebuffer_ptr
;
644 xfree (readline_input_state
.linebuffer
);
651 signal (STOP_SIGNAL
, handle_stop_sig
);
654 /* Make sure that all output has been output. Some machines may let
655 you get away with leaving out some of the gdb_flush, but not all. */
657 gdb_flush (gdb_stdout
);
658 gdb_flush (gdb_stderr
);
660 if (source_file_name
!= NULL
)
662 ++source_line_number
;
663 sprintf (source_error
,
664 "%s%s:%d: Error in sourced command file:\n",
668 error_pre_print
= source_error
;
671 /* If we are in this case, then command_handler will call quit
672 and exit from gdb. */
673 if (!rl
|| rl
== (char *) EOF
)
678 if (strlen (rl
) + 1 + (p
- linebuffer
) > linelength
)
680 linelength
= strlen (rl
) + 1 + (p
- linebuffer
);
681 nline
= (char *) xrealloc (linebuffer
, linelength
);
682 p
+= nline
- linebuffer
;
686 /* Copy line. Don't copy null at end. (Leaves line alone
687 if this was just a newline) */
691 xfree (rl
); /* Allocated in readline. */
693 if (*(p
- 1) == '\\')
695 p
--; /* Put on top of '\'. */
699 readline_input_state
.linebuffer
= savestring (linebuffer
,
700 strlen (linebuffer
));
701 readline_input_state
.linebuffer_ptr
= p
;
703 /* We will not invoke a execute_command if there is more
704 input expected to complete the command. So, we need to
705 print an empty prompt here. */
707 push_prompt ("", "", "");
708 display_gdb_prompt (0);
715 signal (STOP_SIGNAL
, SIG_DFL
);
718 #define SERVER_COMMAND_LENGTH 7
720 (p
- linebuffer
> SERVER_COMMAND_LENGTH
)
721 && STREQN (linebuffer
, "server ", SERVER_COMMAND_LENGTH
);
724 /* Note that we don't set `line'. Between this and the check in
725 dont_repeat, this insures that repeating will still do the
728 command_handler (linebuffer
+ SERVER_COMMAND_LENGTH
);
729 display_gdb_prompt (0);
733 /* Do history expansion if that is wished. */
734 if (history_expansion_p
&& instream
== stdin
735 && ISATTY (instream
))
740 *p
= '\0'; /* Insert null now. */
741 expanded
= history_expand (linebuffer
, &history_value
);
744 /* Print the changes. */
745 printf_unfiltered ("%s\n", history_value
);
747 /* If there was an error, call this function again. */
750 xfree (history_value
);
753 if (strlen (history_value
) > linelength
)
755 linelength
= strlen (history_value
) + 1;
756 linebuffer
= (char *) xrealloc (linebuffer
, linelength
);
758 strcpy (linebuffer
, history_value
);
759 p
= linebuffer
+ strlen (linebuffer
);
760 xfree (history_value
);
764 /* If we just got an empty line, and that is supposed
765 to repeat the previous command, return the value in the
767 if (repeat
&& p
== linebuffer
&& *p
!= '\\')
769 command_handler (line
);
770 display_gdb_prompt (0);
774 for (p1
= linebuffer
; *p1
== ' ' || *p1
== '\t'; p1
++);
777 command_handler (line
);
778 display_gdb_prompt (0);
784 /* Add line to history if appropriate. */
785 if (instream
== stdin
786 && ISATTY (stdin
) && *linebuffer
)
787 add_history (linebuffer
);
789 /* Note: lines consisting solely of comments are added to the command
790 history. This is useful when you type a command, and then
791 realize you don't want to execute it quite yet. You can comment
792 out the command and then later fetch it from the value history
793 and remove the '#'. The kill ring is probably better, but some
794 people are in the habit of commenting things out. */
796 *p1
= '\0'; /* Found a comment. */
798 /* Save into global buffer if appropriate. */
801 if (linelength
> linesize
)
803 line
= xrealloc (line
, linelength
);
804 linesize
= linelength
;
806 strcpy (line
, linebuffer
);
809 command_handler (line
);
810 display_gdb_prompt (0);
815 command_handler (linebuffer
);
816 display_gdb_prompt (0);
820 /* Does reading of input from terminal w/o the editing features
821 provided by the readline library. */
823 /* NOTE: 1999-04-30 Asynchronous version of gdb_readline. gdb_readline
824 will become obsolete when the event loop is made the default
825 execution for gdb. */
827 gdb_readline2 (gdb_client_data client_data
)
832 int result_size
= 80;
833 static int done_once
= 0;
835 /* Unbuffer the input stream, so that, later on, the calls to fgetc
836 fetch only one char at the time from the stream. The fgetc's will
837 get up to the first newline, but there may be more chars in the
838 stream after '\n'. If we buffer the input and fgetc drains the
839 stream, getting stuff beyond the newline as well, a select, done
840 afterwards will not trigger. */
841 if (!done_once
&& !ISATTY (instream
))
843 setbuf (instream
, NULL
);
847 result
= (char *) xmalloc (result_size
);
849 /* We still need the while loop here, even though it would seem
850 obvious to invoke gdb_readline2 at every character entered. If
851 not using the readline library, the terminal is in cooked mode,
852 which sends the characters all at once. Poll will notice that the
853 input fd has changed state only after enter is pressed. At this
854 point we still need to fetch all the chars entered. */
858 /* Read from stdin if we are executing a user defined command.
859 This is the right thing for prompt_for_continue, at least. */
860 c
= fgetc (instream
? instream
: stdin
);
865 /* The last line does not end with a newline. Return it, and
866 if we are called again fgetc will still return EOF and
867 we'll return NULL then. */
870 (*input_handler
) (0);
874 #ifndef CRLF_SOURCE_FILES
878 if (input_index
> 0 && result
[input_index
- 1] == '\r')
884 result
[input_index
++] = c
;
885 while (input_index
>= result_size
)
888 result
= (char *) xrealloc (result
, result_size
);
892 result
[input_index
++] = '\0';
893 (*input_handler
) (result
);
897 /* Initialization of signal handlers and tokens. There is a function
898 handle_sig* for each of the signals GDB cares about. Specifically:
899 SIGINT, SIGFPE, SIGQUIT, SIGTSTP, SIGHUP, SIGWINCH. These
900 functions are the actual signal handlers associated to the signals
901 via calls to signal(). The only job for these functions is to
902 enqueue the appropriate event/procedure with the event loop. Such
903 procedures are the old signal handlers. The event loop will take
904 care of invoking the queued procedures to perform the usual tasks
905 associated with the reception of the signal. */
906 /* NOTE: 1999-04-30 This is the asynchronous version of init_signals.
907 init_signals will become obsolete as we move to have to event loop
908 as the default for gdb. */
910 async_init_signals (void)
912 signal (SIGINT
, handle_sigint
);
914 create_async_signal_handler (async_request_quit
, NULL
);
916 /* If SIGTRAP was set to SIG_IGN, then the SIG_IGN will get passed
917 to the inferior and breakpoints will be ignored. */
919 signal (SIGTRAP
, SIG_DFL
);
922 /* If we initialize SIGQUIT to SIG_IGN, then the SIG_IGN will get
923 passed to the inferior, which we don't want. It would be
924 possible to do a "signal (SIGQUIT, SIG_DFL)" after we fork, but
925 on BSD4.3 systems using vfork, that can affect the
926 GDB process as well as the inferior (the signal handling tables
927 might be in memory, shared between the two). Since we establish
928 a handler for SIGQUIT, when we call exec it will set the signal
929 to SIG_DFL for us. */
930 signal (SIGQUIT
, handle_sigquit
);
932 create_async_signal_handler (async_do_nothing
, NULL
);
934 if (signal (SIGHUP
, handle_sighup
) != SIG_IGN
)
936 create_async_signal_handler (async_disconnect
, NULL
);
939 create_async_signal_handler (async_do_nothing
, NULL
);
941 signal (SIGFPE
, handle_sigfpe
);
943 create_async_signal_handler (async_float_handler
, NULL
);
945 #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER)
946 signal (SIGWINCH
, handle_sigwinch
);
948 create_async_signal_handler (SIGWINCH_HANDLER
, NULL
);
952 create_async_signal_handler (async_stop_sig
, NULL
);
958 mark_async_signal_handler_wrapper (void *token
)
960 mark_async_signal_handler ((struct async_signal_handler
*) token
);
963 /* Tell the event loop what to do if SIGINT is received.
964 See event-signal.c. */
966 handle_sigint (int sig
)
968 signal (sig
, handle_sigint
);
970 /* If immediate_quit is set, we go ahead and process the SIGINT right
971 away, even if we usually would defer this to the event loop. The
972 assumption here is that it is safe to process ^C immediately if
973 immediate_quit is set. If we didn't, SIGINT would be really
974 processed only the next time through the event loop. To get to
975 that point, though, the command that we want to interrupt needs to
976 finish first, which is unacceptable. */
978 async_request_quit (0);
980 /* If immediate quit is not set, we process SIGINT the next time
981 through the loop, which is fine. */
982 mark_async_signal_handler_wrapper (sigint_token
);
985 /* Do the quit. All the checks have been done by the caller. */
987 async_request_quit (gdb_client_data arg
)
997 /* Tell the event loop what to do if SIGQUIT is received.
998 See event-signal.c. */
1000 handle_sigquit (int sig
)
1002 mark_async_signal_handler_wrapper (sigquit_token
);
1003 signal (sig
, handle_sigquit
);
1006 /* Called by the event loop in response to a SIGQUIT. */
1008 async_do_nothing (gdb_client_data arg
)
1010 /* Empty function body. */
1014 /* Tell the event loop what to do if SIGHUP is received.
1015 See event-signal.c. */
1017 handle_sighup (int sig
)
1019 mark_async_signal_handler_wrapper (sighup_token
);
1020 signal (sig
, handle_sighup
);
1023 /* Called by the event loop to process a SIGHUP */
1025 async_disconnect (gdb_client_data arg
)
1027 catch_errors (quit_cover
, NULL
,
1028 "Could not kill the program being debugged",
1030 signal (SIGHUP
, SIG_DFL
); /*FIXME: ??????????? */
1031 kill (getpid (), SIGHUP
);
1037 handle_stop_sig (int sig
)
1039 mark_async_signal_handler_wrapper (sigtstp_token
);
1040 signal (sig
, handle_stop_sig
);
1044 async_stop_sig (gdb_client_data arg
)
1046 char *prompt
= get_prompt ();
1047 #if STOP_SIGNAL == SIGTSTP
1048 signal (SIGTSTP
, SIG_DFL
);
1049 #if HAVE_SIGPROCMASK
1052 sigemptyset (&zero
);
1053 sigprocmask (SIG_SETMASK
, &zero
, 0);
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);