1 /* Top level stuff for GDB, the GNU debugger.
3 Copyright (C) 1999, 2000, 2001, 2002, 2004, 2005, 2007, 2008, 2009
4 Free Software Foundation, Inc.
6 Written by Elena Zannoni <ezannoni@cygnus.com> of Cygnus Solutions.
8 This file is part of GDB.
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 3 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program. If not, see <http://www.gnu.org/licenses/>. */
27 #include "terminal.h" /* for job_control */
28 #include "event-loop.h"
29 #include "event-top.h"
32 #include "exceptions.h"
33 #include "cli/cli-script.h" /* for reset_command_nest_depth */
35 #include "gdbthread.h"
37 /* For dont_repeat() */
40 /* readline include files */
41 #include "readline/readline.h"
42 #include "readline/history.h"
44 /* readline defines this. */
47 static void rl_callback_read_char_wrapper (gdb_client_data client_data);
48 static void command_line_handler (char *rl);
49 static void change_line_handler (void);
50 static void change_annotation_level (void);
51 static void command_handler (char *command);
53 /* Signal handlers. */
55 static void handle_sigquit (int sig);
58 static void handle_sighup (int sig);
60 static void handle_sigfpe (int sig);
61 #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER)
62 static void handle_sigwinch (int sig);
65 /* Functions to be invoked by the event loop in response to
67 #if defined (SIGQUIT) || defined (SIGHUP)
68 static void async_do_nothing (gdb_client_data);
71 static void async_disconnect (gdb_client_data);
73 static void async_float_handler (gdb_client_data);
75 static void async_stop_sig (gdb_client_data);
78 /* Readline offers an alternate interface, via callback
79 functions. These are all included in the file callback.c in the
80 readline distribution. This file provides (mainly) a function, which
81 the event loop uses as callback (i.e. event handler) whenever an event
82 is detected on the standard input file descriptor.
83 readline_callback_read_char is called (by the GDB event loop) whenever
84 there is a new character ready on the input stream. This function
85 incrementally builds a buffer internal to readline where it
86 accumulates the line read up to the point of invocation. In the
87 special case in which the character read is newline, the function
88 invokes a GDB supplied callback routine, which does the processing of
89 a full command line. This latter routine is the asynchronous analog
90 of the old command_line_input in gdb. Instead of invoking (and waiting
91 for) readline to read the command line and pass it back to
92 command_loop for processing, the new command_line_handler function has
93 the command line already available as its parameter. INPUT_HANDLER is
94 to be set to the function that readline will invoke when a complete
95 line of input is ready. CALL_READLINE is to be set to the function
96 that readline offers as callback to the event_loop. */
98 void (*input_handler) (char *);
99 void (*call_readline) (gdb_client_data);
101 /* Important variables for the event loop. */
103 /* This is used to determine if GDB is using the readline library or
104 its own simplified form of readline. It is used by the asynchronous
105 form of the set editing command.
106 ezannoni: as of 1999-04-29 I expect that this
107 variable will not be used after gdb is changed to use the event
108 loop as default engine, and event-top.c is merged into top.c. */
109 int async_command_editing_p;
111 /* This variable contains the new prompt that the user sets with the
112 set prompt command. */
113 char *new_async_prompt;
115 /* This is the annotation suffix that will be used when the
116 annotation_level is 2. */
117 char *async_annotation_suffix;
119 /* This is used to display the notification of the completion of an
120 asynchronous execution command. */
121 int exec_done_display_p = 0;
123 /* This is the file descriptor for the input stream that GDB uses to
124 read commands from. */
127 /* This is the prompt stack. Prompts will be pushed on the stack as
128 needed by the different 'kinds' of user inputs GDB is asking
129 for. See event-loop.h. */
130 struct prompts the_prompts;
132 /* signal handling variables */
133 /* Each of these is a pointer to a function that the event loop will
134 invoke if the corresponding signal has received. The real signal
135 handlers mark these functions as ready to be executed and the event
136 loop, in a later iteration, calls them. See the function
137 invoke_async_signal_handler. */
146 #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER)
147 void *sigwinch_token;
153 /* Structure to save a partially entered command. This is used when
154 the user types '\' at the end of a command line. This is necessary
155 because each line of input is handled by a different call to
156 command_line_handler, and normally there is no state retained
157 between different calls. */
158 int more_to_come = 0;
160 struct readline_input_state
163 char *linebuffer_ptr;
165 readline_input_state;
167 /* This hook is called by rl_callback_read_char_wrapper after each
168 character is processed. */
169 void (*after_char_processing_hook) ();
172 /* Wrapper function for calling into the readline library. The event
173 loop expects the callback function to have a paramter, while readline
176 rl_callback_read_char_wrapper (gdb_client_data client_data)
178 rl_callback_read_char ();
179 if (after_char_processing_hook)
180 (*after_char_processing_hook) ();
183 /* Initialize all the necessary variables, start the event loop,
184 register readline, and stdin, start the loop. */
186 cli_command_loop (void)
188 /* If we are using readline, set things up and display the first
189 prompt, otherwise just print the prompt. */
190 if (async_command_editing_p)
194 char *gdb_prompt = get_prompt ();
196 /* Tell readline what the prompt to display is and what function it
197 will need to call after a whole line is read. This also displays
199 length = strlen (PREFIX (0))
200 + strlen (gdb_prompt) + strlen (SUFFIX (0)) + 1;
201 a_prompt = (char *) alloca (length);
202 strcpy (a_prompt, PREFIX (0));
203 strcat (a_prompt, gdb_prompt);
204 strcat (a_prompt, SUFFIX (0));
205 rl_callback_handler_install (a_prompt, input_handler);
208 display_gdb_prompt (0);
210 /* Now it's time to start the event loop. */
214 /* Change the function to be invoked every time there is a character
215 ready on stdin. This is used when the user sets the editing off,
216 therefore bypassing readline, and letting gdb handle the input
217 itself, via gdb_readline2. Also it is used in the opposite case in
218 which the user sets editing on again, by restoring readline
219 handling of the input. */
221 change_line_handler (void)
223 /* NOTE: this operates on input_fd, not instream. If we are reading
224 commands from a file, instream will point to the file. However in
225 async mode, we always read commands from a file with editing
226 off. This means that the 'set editing on/off' will have effect
227 only on the interactive session. */
229 if (async_command_editing_p)
231 /* Turn on editing by using readline. */
232 call_readline = rl_callback_read_char_wrapper;
233 input_handler = command_line_handler;
237 /* Turn off editing by using gdb_readline2. */
238 rl_callback_handler_remove ();
239 call_readline = gdb_readline2;
241 /* Set up the command handler as well, in case we are called as
242 first thing from .gdbinit. */
243 input_handler = command_line_handler;
247 /* Displays the prompt. The prompt that is displayed is the current
248 top of the prompt stack, if the argument NEW_PROMPT is
249 0. Otherwise, it displays whatever NEW_PROMPT is. This is used
250 after each gdb command has completed, and in the following cases:
251 1. when the user enters a command line which is ended by '\'
252 indicating that the command will continue on the next line.
253 In that case the prompt that is displayed is the empty string.
254 2. When the user is entering 'commands' for a breakpoint, or
255 actions for a tracepoint. In this case the prompt will be '>'
257 FIXME: 2. & 3. not implemented yet for async. */
259 display_gdb_prompt (char *new_prompt)
261 int prompt_length = 0;
262 char *gdb_prompt = get_prompt ();
264 /* Reset the nesting depth used when trace-commands is set. */
265 reset_command_nest_depth ();
267 /* Each interpreter has its own rules on displaying the command
269 if (!current_interp_display_prompt_p ())
272 if (sync_execution && is_running (inferior_ptid))
274 /* This is to trick readline into not trying to display the
275 prompt. Even though we display the prompt using this
276 function, readline still tries to do its own display if we
277 don't call rl_callback_handler_install and
278 rl_callback_handler_remove (which readline detects because a
279 global variable is not set). If readline did that, it could
280 mess up gdb signal handlers for SIGINT. Readline assumes
281 that between calls to rl_set_signals and rl_clear_signals gdb
282 doesn't do anything with the signal handlers. Well, that's
283 not the case, because when the target executes we change the
284 SIGINT signal handler. If we allowed readline to display the
285 prompt, the signal handler change would happen exactly
286 between the calls to the above two functions.
287 Calling rl_callback_handler_remove(), does the job. */
289 rl_callback_handler_remove ();
295 /* Just use the top of the prompt stack. */
296 prompt_length = strlen (PREFIX (0)) +
297 strlen (SUFFIX (0)) +
298 strlen (gdb_prompt) + 1;
300 new_prompt = (char *) alloca (prompt_length);
302 /* Prefix needs to have new line at end. */
303 strcpy (new_prompt, PREFIX (0));
304 strcat (new_prompt, gdb_prompt);
305 /* Suffix needs to have a new line at end and \032 \032 at
307 strcat (new_prompt, SUFFIX (0));
310 if (async_command_editing_p)
312 rl_callback_handler_remove ();
313 rl_callback_handler_install (new_prompt, input_handler);
315 /* new_prompt at this point can be the top of the stack or the one passed in */
318 /* Don't use a _filtered function here. It causes the assumed
319 character position to be off, since the newline we read from
320 the user is not accounted for. */
321 fputs_unfiltered (new_prompt, gdb_stdout);
322 gdb_flush (gdb_stdout);
326 /* Used when the user requests a different annotation level, with
327 'set annotate'. It pushes a new prompt (with prefix and suffix) on top
328 of the prompt stack, if the annotation level desired is 2, otherwise
329 it pops the top of the prompt stack when we want the annotation level
330 to be the normal ones (1 or 0). */
332 change_annotation_level (void)
334 char *prefix, *suffix;
336 if (!PREFIX (0) || !PROMPT (0) || !SUFFIX (0))
338 /* The prompt stack has not been initialized to "", we are
339 using gdb w/o the --async switch */
340 warning (_("Command has same effect as set annotate"));
344 if (annotation_level > 1)
346 if (!strcmp (PREFIX (0), "") && !strcmp (SUFFIX (0), ""))
348 /* Push a new prompt if the previous annotation_level was not >1. */
349 prefix = (char *) alloca (strlen (async_annotation_suffix) + 10);
350 strcpy (prefix, "\n\032\032pre-");
351 strcat (prefix, async_annotation_suffix);
352 strcat (prefix, "\n");
354 suffix = (char *) alloca (strlen (async_annotation_suffix) + 6);
355 strcpy (suffix, "\n\032\032");
356 strcat (suffix, async_annotation_suffix);
357 strcat (suffix, "\n");
359 push_prompt (prefix, (char *) 0, suffix);
364 if (strcmp (PREFIX (0), "") && strcmp (SUFFIX (0), ""))
366 /* Pop the top of the stack, we are going back to annotation < 1. */
372 /* Pushes a new prompt on the prompt stack. Each prompt has three
373 parts: prefix, prompt, suffix. Usually prefix and suffix are empty
374 strings, except when the annotation level is 2. Memory is allocated
375 within savestring for the new prompt. */
377 push_prompt (char *prefix, char *prompt, char *suffix)
380 PREFIX (0) = savestring (prefix, strlen (prefix));
382 /* Note that this function is used by the set annotate 2
383 command. This is why we take care of saving the old prompt
384 in case a new one is not specified. */
386 PROMPT (0) = savestring (prompt, strlen (prompt));
388 PROMPT (0) = savestring (PROMPT (-1), strlen (PROMPT (-1)));
390 SUFFIX (0) = savestring (suffix, strlen (suffix));
393 /* Pops the top of the prompt stack, and frees the memory allocated for it. */
397 /* If we are not during a 'synchronous' execution command, in which
398 case, the top prompt would be empty. */
399 if (strcmp (PROMPT (0), ""))
400 /* This is for the case in which the prompt is set while the
401 annotation level is 2. The top prompt will be changed, but when
402 we return to annotation level < 2, we want that new prompt to be
403 in effect, until the user does another 'set prompt'. */
404 if (strcmp (PROMPT (0), PROMPT (-1)))
407 PROMPT (-1) = savestring (PROMPT (0), strlen (PROMPT (0)));
416 /* When there is an event ready on the stdin file desriptor, instead
417 of calling readline directly throught the callback function, or
418 instead of calling gdb_readline2, give gdb a chance to detect
419 errors and do something. */
421 stdin_event_handler (int error, gdb_client_data client_data)
425 printf_unfiltered (_("error detected on stdin\n"));
426 delete_file_handler (input_fd);
427 discard_all_continuations ();
428 discard_all_intermediate_continuations ();
429 /* If stdin died, we may as well kill gdb. */
430 quit_command ((char *) 0, stdin == instream);
433 (*call_readline) (client_data);
436 /* Re-enable stdin after the end of an execution command in
437 synchronous mode, or after an error from the target, and we aborted
438 the exec operation. */
441 async_enable_stdin (void)
445 /* See NOTE in async_disable_stdin() */
446 /* FIXME: cagney/1999-09-27: Call this before clearing
447 sync_execution. Current target_terminal_ours() implementations
448 check for sync_execution before switching the terminal. */
449 target_terminal_ours ();
455 /* Disable reads from stdin (the console) marking the command as
459 async_disable_stdin (void)
462 push_prompt ("", "", "");
463 /* FIXME: cagney/1999-09-27: At present this call is technically
464 redundant since infcmd.c and infrun.c both already call
465 target_terminal_inferior(). As the terminal handling (in
466 sync/async mode) is refined, the duplicate calls can be
467 eliminated (Here or in infcmd.c/infrun.c). */
468 target_terminal_inferior ();
472 /* Handles a gdb command. This function is called by
473 command_line_handler, which has processed one or more input lines
475 /* NOTE: 1999-04-30 This is the asynchronous version of the command_loop
476 function. The command_loop function will be obsolete when we
477 switch to use the event loop at every execution of gdb. */
479 command_handler (char *command)
481 int stdin_is_tty = ISATTY (stdin);
482 long time_at_cmd_start;
484 long space_at_cmd_start = 0;
486 extern int display_time;
487 extern int display_space;
490 if (instream == stdin && stdin_is_tty)
491 reinitialize_more_filter ();
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. */
500 printf_unfiltered ("quit\n");
501 execute_command ("quit", stdin == instream);
504 time_at_cmd_start = get_run_time ();
509 char *lim = (char *) sbrk (0);
510 space_at_cmd_start = lim - lim_at_start;
514 execute_command (command, instream == stdin);
516 /* Do any commands attached to breakpoint we stopped at. */
517 bpstat_do_actions ();
521 long cmd_time = get_run_time () - time_at_cmd_start;
523 printf_unfiltered (_("Command execution time: %ld.%06ld\n"),
524 cmd_time / 1000000, cmd_time % 1000000);
530 char *lim = (char *) sbrk (0);
531 long space_now = lim - lim_at_start;
532 long space_diff = space_now - space_at_cmd_start;
534 printf_unfiltered (_("Space used: %ld (%c%ld for this command)\n"),
536 (space_diff >= 0 ? '+' : '-'),
542 /* Handle a complete line of input. This is called by the callback
543 mechanism within the readline library. Deal with incomplete commands
544 as well, by saving the partial input in a global buffer. */
546 /* NOTE: 1999-04-30 This is the asynchronous version of the
547 command_line_input function. command_line_input will become
548 obsolete once we use the event loop as the default mechanism in
551 command_line_handler (char *rl)
553 static char *linebuffer = 0;
554 static unsigned linelength = 0;
563 int repeat = (instream == stdin);
565 if (annotation_level > 1 && instream == stdin)
567 printf_unfiltered (("\n\032\032post-"));
568 puts_unfiltered (async_annotation_suffix);
569 printf_unfiltered (("\n"));
575 linebuffer = (char *) xmalloc (linelength);
582 strcpy (linebuffer, readline_input_state.linebuffer);
583 p = readline_input_state.linebuffer_ptr;
584 xfree (readline_input_state.linebuffer);
591 signal (STOP_SIGNAL, handle_stop_sig);
594 /* Make sure that all output has been output. Some machines may let
595 you get away with leaving out some of the gdb_flush, but not all. */
597 gdb_flush (gdb_stdout);
598 gdb_flush (gdb_stderr);
600 if (source_file_name != NULL)
601 ++source_line_number;
603 /* If we are in this case, then command_handler will call quit
604 and exit from gdb. */
605 if (!rl || rl == (char *) EOF)
611 if (strlen (rl) + 1 + (p - linebuffer) > linelength)
613 linelength = strlen (rl) + 1 + (p - linebuffer);
614 nline = (char *) xrealloc (linebuffer, linelength);
615 p += nline - linebuffer;
619 /* Copy line. Don't copy null at end. (Leaves line alone
620 if this was just a newline) */
624 xfree (rl); /* Allocated in readline. */
626 if (p > linebuffer && *(p - 1) == '\\')
628 p--; /* Put on top of '\'. */
630 readline_input_state.linebuffer = savestring (linebuffer,
631 strlen (linebuffer));
632 readline_input_state.linebuffer_ptr = p;
634 /* We will not invoke a execute_command if there is more
635 input expected to complete the command. So, we need to
636 print an empty prompt here. */
638 push_prompt ("", "", "");
639 display_gdb_prompt (0);
645 signal (STOP_SIGNAL, SIG_DFL);
648 #define SERVER_COMMAND_LENGTH 7
650 (p - linebuffer > SERVER_COMMAND_LENGTH)
651 && strncmp (linebuffer, "server ", SERVER_COMMAND_LENGTH) == 0;
654 /* Note that we don't set `line'. Between this and the check in
655 dont_repeat, this insures that repeating will still do the
658 command_handler (linebuffer + SERVER_COMMAND_LENGTH);
659 display_gdb_prompt (0);
663 /* Do history expansion if that is wished. */
664 if (history_expansion_p && instream == stdin
665 && ISATTY (instream))
670 *p = '\0'; /* Insert null now. */
671 expanded = history_expand (linebuffer, &history_value);
674 /* Print the changes. */
675 printf_unfiltered ("%s\n", history_value);
677 /* If there was an error, call this function again. */
680 xfree (history_value);
683 if (strlen (history_value) > linelength)
685 linelength = strlen (history_value) + 1;
686 linebuffer = (char *) xrealloc (linebuffer, linelength);
688 strcpy (linebuffer, history_value);
689 p = linebuffer + strlen (linebuffer);
691 xfree (history_value);
694 /* If we just got an empty line, and that is supposed
695 to repeat the previous command, return the value in the
697 if (repeat && p == linebuffer && *p != '\\')
699 command_handler (line);
700 display_gdb_prompt (0);
704 for (p1 = linebuffer; *p1 == ' ' || *p1 == '\t'; p1++);
707 command_handler (line);
708 display_gdb_prompt (0);
714 /* Add line to history if appropriate. */
715 if (instream == stdin
716 && ISATTY (stdin) && *linebuffer)
717 add_history (linebuffer);
719 /* Note: lines consisting solely of comments are added to the command
720 history. This is useful when you type a command, and then
721 realize you don't want to execute it quite yet. You can comment
722 out the command and then later fetch it from the value history
723 and remove the '#'. The kill ring is probably better, but some
724 people are in the habit of commenting things out. */
726 *p1 = '\0'; /* Found a comment. */
728 /* Save into global buffer if appropriate. */
731 if (linelength > linesize)
733 line = xrealloc (line, linelength);
734 linesize = linelength;
736 strcpy (line, linebuffer);
739 command_handler (line);
740 display_gdb_prompt (0);
745 command_handler (linebuffer);
746 display_gdb_prompt (0);
750 /* Does reading of input from terminal w/o the editing features
751 provided by the readline library. */
753 /* NOTE: 1999-04-30 Asynchronous version of gdb_readline. gdb_readline
754 will become obsolete when the event loop is made the default
755 execution for gdb. */
757 gdb_readline2 (gdb_client_data client_data)
762 int result_size = 80;
763 static int done_once = 0;
765 /* Unbuffer the input stream, so that, later on, the calls to fgetc
766 fetch only one char at the time from the stream. The fgetc's will
767 get up to the first newline, but there may be more chars in the
768 stream after '\n'. If we buffer the input and fgetc drains the
769 stream, getting stuff beyond the newline as well, a select, done
770 afterwards will not trigger. */
771 if (!done_once && !ISATTY (instream))
773 setbuf (instream, NULL);
777 result = (char *) xmalloc (result_size);
779 /* We still need the while loop here, even though it would seem
780 obvious to invoke gdb_readline2 at every character entered. If
781 not using the readline library, the terminal is in cooked mode,
782 which sends the characters all at once. Poll will notice that the
783 input fd has changed state only after enter is pressed. At this
784 point we still need to fetch all the chars entered. */
788 /* Read from stdin if we are executing a user defined command.
789 This is the right thing for prompt_for_continue, at least. */
790 c = fgetc (instream ? instream : stdin);
795 /* The last line does not end with a newline. Return it, and
796 if we are called again fgetc will still return EOF and
797 we'll return NULL then. */
800 (*input_handler) (0);
806 if (input_index > 0 && result[input_index - 1] == '\r')
811 result[input_index++] = c;
812 while (input_index >= result_size)
815 result = (char *) xrealloc (result, result_size);
819 result[input_index++] = '\0';
820 (*input_handler) (result);
824 /* Initialization of signal handlers and tokens. There is a function
825 handle_sig* for each of the signals GDB cares about. Specifically:
826 SIGINT, SIGFPE, SIGQUIT, SIGTSTP, SIGHUP, SIGWINCH. These
827 functions are the actual signal handlers associated to the signals
828 via calls to signal(). The only job for these functions is to
829 enqueue the appropriate event/procedure with the event loop. Such
830 procedures are the old signal handlers. The event loop will take
831 care of invoking the queued procedures to perform the usual tasks
832 associated with the reception of the signal. */
833 /* NOTE: 1999-04-30 This is the asynchronous version of init_signals.
834 init_signals will become obsolete as we move to have to event loop
835 as the default for gdb. */
837 async_init_signals (void)
839 signal (SIGINT, handle_sigint);
841 create_async_signal_handler (async_request_quit, NULL);
842 signal (SIGTERM, handle_sigterm);
844 /* If SIGTRAP was set to SIG_IGN, then the SIG_IGN will get passed
845 to the inferior and breakpoints will be ignored. */
847 signal (SIGTRAP, SIG_DFL);
851 /* If we initialize SIGQUIT to SIG_IGN, then the SIG_IGN will get
852 passed to the inferior, which we don't want. It would be
853 possible to do a "signal (SIGQUIT, SIG_DFL)" after we fork, but
854 on BSD4.3 systems using vfork, that can affect the
855 GDB process as well as the inferior (the signal handling tables
856 might be in memory, shared between the two). Since we establish
857 a handler for SIGQUIT, when we call exec it will set the signal
858 to SIG_DFL for us. */
859 signal (SIGQUIT, handle_sigquit);
861 create_async_signal_handler (async_do_nothing, NULL);
864 if (signal (SIGHUP, handle_sighup) != SIG_IGN)
866 create_async_signal_handler (async_disconnect, NULL);
869 create_async_signal_handler (async_do_nothing, NULL);
871 signal (SIGFPE, handle_sigfpe);
873 create_async_signal_handler (async_float_handler, NULL);
875 #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER)
876 signal (SIGWINCH, handle_sigwinch);
878 create_async_signal_handler (SIGWINCH_HANDLER, NULL);
882 create_async_signal_handler (async_stop_sig, NULL);
888 mark_async_signal_handler_wrapper (void *token)
890 mark_async_signal_handler ((struct async_signal_handler *) token);
893 /* Tell the event loop what to do if SIGINT is received.
894 See event-signal.c. */
896 handle_sigint (int sig)
898 signal (sig, handle_sigint);
900 /* We could be running in a loop reading in symfiles or something so
901 it may be quite a while before we get back to the event loop. So
902 set quit_flag to 1 here. Then if QUIT is called before we get to
903 the event loop, we will unwind as expected. */
907 /* If immediate_quit is set, we go ahead and process the SIGINT right
908 away, even if we usually would defer this to the event loop. The
909 assumption here is that it is safe to process ^C immediately if
910 immediate_quit is set. If we didn't, SIGINT would be really
911 processed only the next time through the event loop. To get to
912 that point, though, the command that we want to interrupt needs to
913 finish first, which is unacceptable. If immediate quit is not set,
914 we process SIGINT the next time through the loop, which is fine. */
915 gdb_call_async_signal_handler (sigint_token, immediate_quit);
918 /* Quit GDB if SIGTERM is received.
919 GDB would quit anyway, but this way it will clean up properly. */
921 handle_sigterm (int sig)
923 signal (sig, handle_sigterm);
924 quit_force ((char *) 0, stdin == instream);
927 /* Do the quit. All the checks have been done by the caller. */
929 async_request_quit (gdb_client_data arg)
931 /* If the quit_flag has gotten reset back to 0 by the time we get
932 back here, that means that an exception was thrown to unwind the
933 current command before we got back to the event loop. So there
934 is no reason to call quit again here, unless immediate_quit is
937 if (quit_flag || immediate_quit)
942 /* Tell the event loop what to do if SIGQUIT is received.
943 See event-signal.c. */
945 handle_sigquit (int sig)
947 mark_async_signal_handler_wrapper (sigquit_token);
948 signal (sig, handle_sigquit);
952 #if defined (SIGQUIT) || defined (SIGHUP)
953 /* Called by the event loop in response to a SIGQUIT or an
956 async_do_nothing (gdb_client_data arg)
958 /* Empty function body. */
963 /* Tell the event loop what to do if SIGHUP is received.
964 See event-signal.c. */
966 handle_sighup (int sig)
968 mark_async_signal_handler_wrapper (sighup_token);
969 signal (sig, handle_sighup);
972 /* Called by the event loop to process a SIGHUP */
974 async_disconnect (gdb_client_data arg)
976 catch_errors (quit_cover, NULL,
977 "Could not kill the program being debugged",
979 signal (SIGHUP, SIG_DFL); /*FIXME: ??????????? */
980 kill (getpid (), SIGHUP);
986 handle_stop_sig (int sig)
988 mark_async_signal_handler_wrapper (sigtstp_token);
989 signal (sig, handle_stop_sig);
993 async_stop_sig (gdb_client_data arg)
995 char *prompt = get_prompt ();
996 #if STOP_SIGNAL == SIGTSTP
997 signal (SIGTSTP, SIG_DFL);
1002 sigemptyset (&zero);
1003 sigprocmask (SIG_SETMASK, &zero, 0);
1005 #elif HAVE_SIGSETMASK
1008 kill (getpid (), SIGTSTP);
1009 signal (SIGTSTP, handle_stop_sig);
1011 signal (STOP_SIGNAL, handle_stop_sig);
1013 printf_unfiltered ("%s", prompt);
1014 gdb_flush (gdb_stdout);
1016 /* Forget about any previous command -- null line now will do nothing. */
1019 #endif /* STOP_SIGNAL */
1021 /* Tell the event loop what to do if SIGFPE is received.
1022 See event-signal.c. */
1024 handle_sigfpe (int sig)
1026 mark_async_signal_handler_wrapper (sigfpe_token);
1027 signal (sig, handle_sigfpe);
1030 /* Event loop will call this functin to process a SIGFPE. */
1032 async_float_handler (gdb_client_data arg)
1034 /* This message is based on ANSI C, section 4.7. Note that integer
1035 divide by zero causes this, so "float" is a misnomer. */
1036 error (_("Erroneous arithmetic operation."));
1039 /* Tell the event loop what to do if SIGWINCH is received.
1040 See event-signal.c. */
1041 #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER)
1043 handle_sigwinch (int sig)
1045 mark_async_signal_handler_wrapper (sigwinch_token);
1046 signal (sig, handle_sigwinch);
1051 /* Called by do_setshow_command. */
1053 set_async_editing_command (char *args, int from_tty, struct cmd_list_element *c)
1055 change_line_handler ();
1058 /* Called by do_setshow_command. */
1060 set_async_annotation_level (char *args, int from_tty, struct cmd_list_element *c)
1062 change_annotation_level ();
1065 /* Called by do_setshow_command. */
1067 set_async_prompt (char *args, int from_tty, struct cmd_list_element *c)
1069 PROMPT (0) = savestring (new_async_prompt, strlen (new_async_prompt));
1072 /* Set things up for readline to be invoked via the alternate
1073 interface, i.e. via a callback function (rl_callback_read_char),
1074 and hook up instream to the event loop. */
1076 gdb_setup_readline (void)
1078 /* This function is a noop for the sync case. The assumption is
1079 that the sync setup is ALL done in gdb_init, and we would only
1080 mess it up here. The sync stuff should really go away over
1083 gdb_stdout = stdio_fileopen (stdout);
1084 gdb_stderr = stdio_fileopen (stderr);
1085 gdb_stdlog = gdb_stderr; /* for moment */
1086 gdb_stdtarg = gdb_stderr; /* for moment */
1088 /* If the input stream is connected to a terminal, turn on
1090 if (ISATTY (instream))
1092 /* Tell gdb that we will be using the readline library. This
1093 could be overwritten by a command in .gdbinit like 'set
1094 editing on' or 'off'. */
1095 async_command_editing_p = 1;
1097 /* When a character is detected on instream by select or poll,
1098 readline will be invoked via this callback function. */
1099 call_readline = rl_callback_read_char_wrapper;
1103 async_command_editing_p = 0;
1104 call_readline = gdb_readline2;
1107 /* When readline has read an end-of-line character, it passes the
1108 complete line to gdb for processing. command_line_handler is the
1109 function that does this. */
1110 input_handler = command_line_handler;
1112 /* Tell readline to use the same input stream that gdb uses. */
1113 rl_instream = instream;
1115 /* Get a file descriptor for the input stream, so that we can
1116 register it with the event loop. */
1117 input_fd = fileno (instream);
1119 /* Now we need to create the event sources for the input file
1121 /* At this point in time, this is the only event source that we
1122 register with the even loop. Another source is going to be the
1123 target program (inferior), but that must be registered only when
1124 it actually exists (I.e. after we say 'run' or after we connect
1125 to a remote target. */
1126 add_file_handler (input_fd, stdin_event_handler, 0);
1129 /* Disable command input through the standard CLI channels. Used in
1130 the suspend proc for interpreters that use the standard gdb readline
1131 interface, like the cli & the mi. */
1133 gdb_disable_readline (void)
1135 /* FIXME - It is too heavyweight to delete and remake these every
1136 time you run an interpreter that needs readline. It is probably
1137 better to have the interpreters cache these, which in turn means
1138 that this needs to be moved into interpreter specific code. */
1141 ui_file_delete (gdb_stdout);
1142 ui_file_delete (gdb_stderr);
1147 rl_callback_handler_remove ();
1148 delete_file_handler (input_fd);