1 /* Top level stuff for GDB, the GNU debugger.
3 Copyright (C) 1999, 2000, 2001, 2002, 2004, 2005, 2007, 2008, 2009, 2010,
4 2011 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 #include "continuations.h"
38 #include "gdbcmd.h" /* 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) (void);
172 /* Wrapper function for calling into the readline library. The event
173 loop expects the callback function to have a paramter, while
174 readline expects none. */
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
197 it will need to call after a whole line is read. This also
198 displays the first prompt. */
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 *actual_gdb_prompt = NULL;
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 /* Get the prompt before the observers are called as observer hook
273 functions may change the prompt. Do not call observers on an
274 explicit prompt change as passed to this function, as this forms
275 a temporary prompt, IE, displayed but not set. */
278 char *post_gdb_prompt = NULL;
279 char *pre_gdb_prompt = xstrdup (get_prompt ());
281 observer_notify_before_prompt (pre_gdb_prompt);
282 post_gdb_prompt = get_prompt ();
284 /* If the observer changed the prompt, use that prompt. */
285 if (strcmp (pre_gdb_prompt, post_gdb_prompt) != 0)
286 actual_gdb_prompt = post_gdb_prompt;
288 xfree (pre_gdb_prompt);
291 if (sync_execution && is_running (inferior_ptid))
293 /* This is to trick readline into not trying to display the
294 prompt. Even though we display the prompt using this
295 function, readline still tries to do its own display if we
296 don't call rl_callback_handler_install and
297 rl_callback_handler_remove (which readline detects because a
298 global variable is not set). If readline did that, it could
299 mess up gdb signal handlers for SIGINT. Readline assumes
300 that between calls to rl_set_signals and rl_clear_signals gdb
301 doesn't do anything with the signal handlers. Well, that's
302 not the case, because when the target executes we change the
303 SIGINT signal handler. If we allowed readline to display the
304 prompt, the signal handler change would happen exactly
305 between the calls to the above two functions.
306 Calling rl_callback_handler_remove(), does the job. */
308 rl_callback_handler_remove ();
312 /* If the observer changed the prompt, ACTUAL_GDB_PROMPT will not be
313 NULL. Otherwise, either copy the existing prompt, or set it to
315 if (! actual_gdb_prompt)
319 /* Just use the top of the prompt stack. */
320 prompt_length = strlen (PREFIX (0)) +
321 strlen (SUFFIX (0)) +
322 strlen (get_prompt()) + 1;
324 actual_gdb_prompt = (char *) alloca (prompt_length);
326 /* Prefix needs to have new line at end. */
327 strcpy (actual_gdb_prompt, PREFIX (0));
328 strcat (actual_gdb_prompt, get_prompt());
329 /* Suffix needs to have a new line at end and \032 \032 at
331 strcat (actual_gdb_prompt, SUFFIX (0));
334 actual_gdb_prompt = new_prompt;;
337 if (async_command_editing_p)
339 rl_callback_handler_remove ();
340 rl_callback_handler_install (actual_gdb_prompt, input_handler);
342 /* new_prompt at this point can be the top of the stack or the one
343 passed in. It can't be NULL. */
346 /* Don't use a _filtered function here. It causes the assumed
347 character position to be off, since the newline we read from
348 the user is not accounted for. */
349 fputs_unfiltered (actual_gdb_prompt, gdb_stdout);
350 gdb_flush (gdb_stdout);
354 /* Used when the user requests a different annotation level, with
355 'set annotate'. It pushes a new prompt (with prefix and suffix) on top
356 of the prompt stack, if the annotation level desired is 2, otherwise
357 it pops the top of the prompt stack when we want the annotation level
358 to be the normal ones (1 or 0). */
360 change_annotation_level (void)
362 char *prefix, *suffix;
364 if (!PREFIX (0) || !PROMPT (0) || !SUFFIX (0))
366 /* The prompt stack has not been initialized to "", we are
367 using gdb w/o the --async switch. */
368 warning (_("Command has same effect as set annotate"));
372 if (annotation_level > 1)
374 if (!strcmp (PREFIX (0), "") && !strcmp (SUFFIX (0), ""))
376 /* Push a new prompt if the previous annotation_level was not >1. */
377 prefix = (char *) alloca (strlen (async_annotation_suffix) + 10);
378 strcpy (prefix, "\n\032\032pre-");
379 strcat (prefix, async_annotation_suffix);
380 strcat (prefix, "\n");
382 suffix = (char *) alloca (strlen (async_annotation_suffix) + 6);
383 strcpy (suffix, "\n\032\032");
384 strcat (suffix, async_annotation_suffix);
385 strcat (suffix, "\n");
387 push_prompt (prefix, (char *) 0, suffix);
392 if (strcmp (PREFIX (0), "") && strcmp (SUFFIX (0), ""))
394 /* Pop the top of the stack, we are going back to annotation < 1. */
400 /* Pushes a new prompt on the prompt stack. Each prompt has three
401 parts: prefix, prompt, suffix. Usually prefix and suffix are empty
402 strings, except when the annotation level is 2. Memory is allocated
403 within xstrdup for the new prompt. */
405 push_prompt (char *prefix, char *prompt, char *suffix)
408 PREFIX (0) = xstrdup (prefix);
410 /* Note that this function is used by the set annotate 2
411 command. This is why we take care of saving the old prompt
412 in case a new one is not specified. */
414 PROMPT (0) = xstrdup (prompt);
416 PROMPT (0) = xstrdup (PROMPT (-1));
418 SUFFIX (0) = xstrdup (suffix);
421 /* Pops the top of the prompt stack, and frees the memory allocated
426 /* If we are not during a 'synchronous' execution command, in which
427 case, the top prompt would be empty. */
428 if (strcmp (PROMPT (0), ""))
429 /* This is for the case in which the prompt is set while the
430 annotation level is 2. The top prompt will be changed, but when
431 we return to annotation level < 2, we want that new prompt to be
432 in effect, until the user does another 'set prompt'. */
433 if (strcmp (PROMPT (0), PROMPT (-1)))
436 PROMPT (-1) = xstrdup (PROMPT (0));
445 /* When there is an event ready on the stdin file desriptor, instead
446 of calling readline directly throught the callback function, or
447 instead of calling gdb_readline2, give gdb a chance to detect
448 errors and do something. */
450 stdin_event_handler (int error, gdb_client_data client_data)
454 printf_unfiltered (_("error detected on stdin\n"));
455 delete_file_handler (input_fd);
456 discard_all_continuations ();
457 discard_all_intermediate_continuations ();
458 /* If stdin died, we may as well kill gdb. */
459 quit_command ((char *) 0, stdin == instream);
462 (*call_readline) (client_data);
465 /* Re-enable stdin after the end of an execution command in
466 synchronous mode, or after an error from the target, and we aborted
467 the exec operation. */
470 async_enable_stdin (void)
474 /* See NOTE in async_disable_stdin(). */
475 /* FIXME: cagney/1999-09-27: Call this before clearing
476 sync_execution. Current target_terminal_ours() implementations
477 check for sync_execution before switching the terminal. */
478 target_terminal_ours ();
484 /* Disable reads from stdin (the console) marking the command as
488 async_disable_stdin (void)
493 push_prompt ("", "", "");
498 /* Handles a gdb command. This function is called by
499 command_line_handler, which has processed one or more input lines
501 /* NOTE: 1999-04-30 This is the asynchronous version of the command_loop
502 function. The command_loop function will be obsolete when we
503 switch to use the event loop at every execution of gdb. */
505 command_handler (char *command)
507 int stdin_is_tty = ISATTY (stdin);
508 struct cleanup *stat_chain;
511 if (instream == stdin && stdin_is_tty)
512 reinitialize_more_filter ();
514 /* If readline returned a NULL command, it means that the connection
515 with the terminal is gone. This happens at the end of a
516 testsuite run, after Expect has hung up but GDB is still alive.
517 In such a case, we just quit gdb killing the inferior program
521 printf_unfiltered ("quit\n");
522 execute_command ("quit", stdin == instream);
525 stat_chain = make_command_stats_cleanup (1);
527 execute_command (command, instream == stdin);
529 /* Do any commands attached to breakpoint we stopped at. */
530 bpstat_do_actions ();
532 do_cleanups (stat_chain);
535 /* Handle a complete line of input. This is called by the callback
536 mechanism within the readline library. Deal with incomplete
537 commands as well, by saving the partial input in a global
540 /* NOTE: 1999-04-30 This is the asynchronous version of the
541 command_line_input function; command_line_input will become
542 obsolete once we use the event loop as the default mechanism in
545 command_line_handler (char *rl)
547 static char *linebuffer = 0;
548 static unsigned linelength = 0;
554 int repeat = (instream == stdin);
556 if (annotation_level > 1 && instream == stdin)
558 printf_unfiltered (("\n\032\032post-"));
559 puts_unfiltered (async_annotation_suffix);
560 printf_unfiltered (("\n"));
566 linebuffer = (char *) xmalloc (linelength);
573 strcpy (linebuffer, readline_input_state.linebuffer);
574 p = readline_input_state.linebuffer_ptr;
575 xfree (readline_input_state.linebuffer);
582 signal (STOP_SIGNAL, handle_stop_sig);
585 /* Make sure that all output has been output. Some machines may let
586 you get away with leaving out some of the gdb_flush, but not
589 gdb_flush (gdb_stdout);
590 gdb_flush (gdb_stderr);
592 if (source_file_name != NULL)
593 ++source_line_number;
595 /* If we are in this case, then command_handler will call quit
596 and exit from gdb. */
597 if (!rl || rl == (char *) EOF)
603 if (strlen (rl) + 1 + (p - linebuffer) > linelength)
605 linelength = strlen (rl) + 1 + (p - linebuffer);
606 nline = (char *) xrealloc (linebuffer, linelength);
607 p += nline - linebuffer;
611 /* Copy line. Don't copy null at end. (Leaves line alone
612 if this was just a newline). */
616 xfree (rl); /* Allocated in readline. */
618 if (p > linebuffer && *(p - 1) == '\\')
621 p--; /* Put on top of '\'. */
623 readline_input_state.linebuffer = xstrdup (linebuffer);
624 readline_input_state.linebuffer_ptr = p;
626 /* We will not invoke a execute_command if there is more
627 input expected to complete the command. So, we need to
628 print an empty prompt here. */
630 push_prompt ("", "", "");
631 display_gdb_prompt (0);
637 signal (STOP_SIGNAL, SIG_DFL);
640 #define SERVER_COMMAND_LENGTH 7
642 (p - linebuffer > SERVER_COMMAND_LENGTH)
643 && strncmp (linebuffer, "server ", SERVER_COMMAND_LENGTH) == 0;
646 /* Note that we don't set `line'. Between this and the check in
647 dont_repeat, this insures that repeating will still do the
650 command_handler (linebuffer + SERVER_COMMAND_LENGTH);
651 display_gdb_prompt (0);
655 /* Do history expansion if that is wished. */
656 if (history_expansion_p && instream == stdin
657 && ISATTY (instream))
662 *p = '\0'; /* Insert null now. */
663 expanded = history_expand (linebuffer, &history_value);
666 /* Print the changes. */
667 printf_unfiltered ("%s\n", history_value);
669 /* If there was an error, call this function again. */
672 xfree (history_value);
675 if (strlen (history_value) > linelength)
677 linelength = strlen (history_value) + 1;
678 linebuffer = (char *) xrealloc (linebuffer, linelength);
680 strcpy (linebuffer, history_value);
681 p = linebuffer + strlen (linebuffer);
683 xfree (history_value);
686 /* If we just got an empty line, and that is supposed to repeat the
687 previous command, return the value in the global buffer. */
688 if (repeat && p == linebuffer && *p != '\\')
690 command_handler (saved_command_line);
691 display_gdb_prompt (0);
695 for (p1 = linebuffer; *p1 == ' ' || *p1 == '\t'; p1++);
698 command_handler (saved_command_line);
699 display_gdb_prompt (0);
705 /* Add line to history if appropriate. */
706 if (instream == stdin
707 && ISATTY (stdin) && *linebuffer)
708 add_history (linebuffer);
710 /* Note: lines consisting solely of comments are added to the command
711 history. This is useful when you type a command, and then
712 realize you don't want to execute it quite yet. You can comment
713 out the command and then later fetch it from the value history
714 and remove the '#'. The kill ring is probably better, but some
715 people are in the habit of commenting things out. */
717 *p1 = '\0'; /* Found a comment. */
719 /* Save into global buffer if appropriate. */
722 if (linelength > saved_command_line_size)
724 saved_command_line = xrealloc (saved_command_line, linelength);
725 saved_command_line_size = linelength;
727 strcpy (saved_command_line, linebuffer);
730 command_handler (saved_command_line);
731 display_gdb_prompt (0);
736 command_handler (linebuffer);
737 display_gdb_prompt (0);
741 /* Does reading of input from terminal w/o the editing features
742 provided by the readline library. */
744 /* NOTE: 1999-04-30 Asynchronous version of gdb_readline; gdb_readline
745 will become obsolete when the event loop is made the default
746 execution for gdb. */
748 gdb_readline2 (gdb_client_data client_data)
753 int result_size = 80;
754 static int done_once = 0;
756 /* Unbuffer the input stream, so that, later on, the calls to fgetc
757 fetch only one char at the time from the stream. The fgetc's will
758 get up to the first newline, but there may be more chars in the
759 stream after '\n'. If we buffer the input and fgetc drains the
760 stream, getting stuff beyond the newline as well, a select, done
761 afterwards will not trigger. */
762 if (!done_once && !ISATTY (instream))
764 setbuf (instream, NULL);
768 result = (char *) xmalloc (result_size);
770 /* We still need the while loop here, even though it would seem
771 obvious to invoke gdb_readline2 at every character entered. If
772 not using the readline library, the terminal is in cooked mode,
773 which sends the characters all at once. Poll will notice that the
774 input fd has changed state only after enter is pressed. At this
775 point we still need to fetch all the chars entered. */
779 /* Read from stdin if we are executing a user defined command.
780 This is the right thing for prompt_for_continue, at least. */
781 c = fgetc (instream ? instream : stdin);
786 /* The last line does not end with a newline. Return it,
787 and if we are called again fgetc will still return EOF
788 and we'll return NULL then. */
791 (*input_handler) (0);
797 if (input_index > 0 && result[input_index - 1] == '\r')
802 result[input_index++] = c;
803 while (input_index >= result_size)
806 result = (char *) xrealloc (result, result_size);
810 result[input_index++] = '\0';
811 (*input_handler) (result);
815 /* Initialization of signal handlers and tokens. There is a function
816 handle_sig* for each of the signals GDB cares about. Specifically:
817 SIGINT, SIGFPE, SIGQUIT, SIGTSTP, SIGHUP, SIGWINCH. These
818 functions are the actual signal handlers associated to the signals
819 via calls to signal(). The only job for these functions is to
820 enqueue the appropriate event/procedure with the event loop. Such
821 procedures are the old signal handlers. The event loop will take
822 care of invoking the queued procedures to perform the usual tasks
823 associated with the reception of the signal. */
824 /* NOTE: 1999-04-30 This is the asynchronous version of init_signals.
825 init_signals will become obsolete as we move to have to event loop
826 as the default for gdb. */
828 async_init_signals (void)
830 signal (SIGINT, handle_sigint);
832 create_async_signal_handler (async_request_quit, NULL);
833 signal (SIGTERM, handle_sigterm);
835 /* If SIGTRAP was set to SIG_IGN, then the SIG_IGN will get passed
836 to the inferior and breakpoints will be ignored. */
838 signal (SIGTRAP, SIG_DFL);
842 /* If we initialize SIGQUIT to SIG_IGN, then the SIG_IGN will get
843 passed to the inferior, which we don't want. It would be
844 possible to do a "signal (SIGQUIT, SIG_DFL)" after we fork, but
845 on BSD4.3 systems using vfork, that can affect the
846 GDB process as well as the inferior (the signal handling tables
847 might be in memory, shared between the two). Since we establish
848 a handler for SIGQUIT, when we call exec it will set the signal
849 to SIG_DFL for us. */
850 signal (SIGQUIT, handle_sigquit);
852 create_async_signal_handler (async_do_nothing, NULL);
855 if (signal (SIGHUP, handle_sighup) != SIG_IGN)
857 create_async_signal_handler (async_disconnect, NULL);
860 create_async_signal_handler (async_do_nothing, NULL);
862 signal (SIGFPE, handle_sigfpe);
864 create_async_signal_handler (async_float_handler, NULL);
866 #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER)
867 signal (SIGWINCH, handle_sigwinch);
869 create_async_signal_handler (SIGWINCH_HANDLER, NULL);
873 create_async_signal_handler (async_stop_sig, NULL);
879 mark_async_signal_handler_wrapper (void *token)
881 mark_async_signal_handler ((struct async_signal_handler *) token);
884 /* Tell the event loop what to do if SIGINT is received.
885 See event-signal.c. */
887 handle_sigint (int sig)
889 signal (sig, handle_sigint);
891 /* We could be running in a loop reading in symfiles or something so
892 it may be quite a while before we get back to the event loop. So
893 set quit_flag to 1 here. Then if QUIT is called before we get to
894 the event loop, we will unwind as expected. */
898 /* If immediate_quit is set, we go ahead and process the SIGINT right
899 away, even if we usually would defer this to the event loop. The
900 assumption here is that it is safe to process ^C immediately if
901 immediate_quit is set. If we didn't, SIGINT would be really
902 processed only the next time through the event loop. To get to
903 that point, though, the command that we want to interrupt needs to
904 finish first, which is unacceptable. If immediate quit is not set,
905 we process SIGINT the next time through the loop, which is fine. */
906 gdb_call_async_signal_handler (sigint_token, immediate_quit);
909 /* Quit GDB if SIGTERM is received.
910 GDB would quit anyway, but this way it will clean up properly. */
912 handle_sigterm (int sig)
914 signal (sig, handle_sigterm);
915 quit_force ((char *) 0, stdin == instream);
918 /* Do the quit. All the checks have been done by the caller. */
920 async_request_quit (gdb_client_data arg)
922 /* If the quit_flag has gotten reset back to 0 by the time we get
923 back here, that means that an exception was thrown to unwind the
924 current command before we got back to the event loop. So there
925 is no reason to call quit again here, unless immediate_quit is
928 if (quit_flag || immediate_quit)
933 /* Tell the event loop what to do if SIGQUIT is received.
934 See event-signal.c. */
936 handle_sigquit (int sig)
938 mark_async_signal_handler_wrapper (sigquit_token);
939 signal (sig, handle_sigquit);
943 #if defined (SIGQUIT) || defined (SIGHUP)
944 /* Called by the event loop in response to a SIGQUIT or an
947 async_do_nothing (gdb_client_data arg)
949 /* Empty function body. */
954 /* Tell the event loop what to do if SIGHUP is received.
955 See event-signal.c. */
957 handle_sighup (int sig)
959 mark_async_signal_handler_wrapper (sighup_token);
960 signal (sig, handle_sighup);
963 /* Called by the event loop to process a SIGHUP. */
965 async_disconnect (gdb_client_data arg)
967 catch_errors (quit_cover, NULL,
968 "Could not kill the program being debugged",
970 signal (SIGHUP, SIG_DFL); /*FIXME: ??????????? */
977 handle_stop_sig (int sig)
979 mark_async_signal_handler_wrapper (sigtstp_token);
980 signal (sig, handle_stop_sig);
984 async_stop_sig (gdb_client_data arg)
986 char *prompt = get_prompt ();
988 #if STOP_SIGNAL == SIGTSTP
989 signal (SIGTSTP, SIG_DFL);
995 sigprocmask (SIG_SETMASK, &zero, 0);
997 #elif HAVE_SIGSETMASK
1001 signal (SIGTSTP, handle_stop_sig);
1003 signal (STOP_SIGNAL, handle_stop_sig);
1005 printf_unfiltered ("%s", prompt);
1006 gdb_flush (gdb_stdout);
1008 /* Forget about any previous command -- null line now will do
1012 #endif /* STOP_SIGNAL */
1014 /* Tell the event loop what to do if SIGFPE is received.
1015 See event-signal.c. */
1017 handle_sigfpe (int sig)
1019 mark_async_signal_handler_wrapper (sigfpe_token);
1020 signal (sig, handle_sigfpe);
1023 /* Event loop will call this functin to process a SIGFPE. */
1025 async_float_handler (gdb_client_data arg)
1027 /* This message is based on ANSI C, section 4.7. Note that integer
1028 divide by zero causes this, so "float" is a misnomer. */
1029 error (_("Erroneous arithmetic operation."));
1032 /* Tell the event loop what to do if SIGWINCH is received.
1033 See event-signal.c. */
1034 #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER)
1036 handle_sigwinch (int sig)
1038 mark_async_signal_handler_wrapper (sigwinch_token);
1039 signal (sig, handle_sigwinch);
1044 /* Called by do_setshow_command. */
1046 set_async_editing_command (char *args, int from_tty,
1047 struct cmd_list_element *c)
1049 change_line_handler ();
1052 /* Called by do_setshow_command. */
1054 set_async_annotation_level (char *args, int from_tty,
1055 struct cmd_list_element *c)
1057 change_annotation_level ();
1060 /* Called by do_setshow_command. */
1062 set_async_prompt (char *args, int from_tty, struct cmd_list_element *c)
1064 PROMPT (0) = xstrdup (new_async_prompt);
1067 /* Set things up for readline to be invoked via the alternate
1068 interface, i.e. via a callback function (rl_callback_read_char),
1069 and hook up instream to the event loop. */
1071 gdb_setup_readline (void)
1073 /* This function is a noop for the sync case. The assumption is
1074 that the sync setup is ALL done in gdb_init, and we would only
1075 mess it up here. The sync stuff should really go away over
1078 gdb_stdout = stdio_fileopen (stdout);
1079 gdb_stderr = stdio_fileopen (stderr);
1080 gdb_stdlog = gdb_stderr; /* for moment */
1081 gdb_stdtarg = gdb_stderr; /* for moment */
1082 gdb_stdtargerr = gdb_stderr; /* for moment */
1084 /* If the input stream is connected to a terminal, turn on
1086 if (ISATTY (instream))
1088 /* Tell gdb that we will be using the readline library. This
1089 could be overwritten by a command in .gdbinit like 'set
1090 editing on' or 'off'. */
1091 async_command_editing_p = 1;
1093 /* When a character is detected on instream by select or poll,
1094 readline will be invoked via this callback function. */
1095 call_readline = rl_callback_read_char_wrapper;
1099 async_command_editing_p = 0;
1100 call_readline = gdb_readline2;
1103 /* When readline has read an end-of-line character, it passes the
1104 complete line to gdb for processing; command_line_handler is the
1105 function that does this. */
1106 input_handler = command_line_handler;
1108 /* Tell readline to use the same input stream that gdb uses. */
1109 rl_instream = instream;
1111 /* Get a file descriptor for the input stream, so that we can
1112 register it with the event loop. */
1113 input_fd = fileno (instream);
1115 /* Now we need to create the event sources for the input file
1117 /* At this point in time, this is the only event source that we
1118 register with the even loop. Another source is going to be the
1119 target program (inferior), but that must be registered only when
1120 it actually exists (I.e. after we say 'run' or after we connect
1121 to a remote target. */
1122 add_file_handler (input_fd, stdin_event_handler, 0);
1125 /* Disable command input through the standard CLI channels. Used in
1126 the suspend proc for interpreters that use the standard gdb readline
1127 interface, like the cli & the mi. */
1129 gdb_disable_readline (void)
1131 /* FIXME - It is too heavyweight to delete and remake these every
1132 time you run an interpreter that needs readline. It is probably
1133 better to have the interpreters cache these, which in turn means
1134 that this needs to be moved into interpreter specific code. */
1137 ui_file_delete (gdb_stdout);
1138 ui_file_delete (gdb_stderr);
1141 gdb_stdtargerr = NULL;
1144 rl_callback_handler_remove ();
1145 delete_file_handler (input_fd);