1 /* Top level stuff for GDB, the GNU debugger.
3 Copyright (C) 1999, 2000, 2001, 2002, 2004, 2005, 2007
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 2 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, write to the Free Software
22 Foundation, Inc., 51 Franklin Street, Fifth Floor,
23 Boston, MA 02110-1301, USA. */
29 #include "terminal.h" /* for job_control */
30 #include "event-loop.h"
31 #include "event-top.h"
34 #include "exceptions.h"
35 #include "cli/cli-script.h" /* for reset_command_nest_depth */
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 command_line_handler_continuation (struct continuation_arg *arg);
50 static void change_line_handler (void);
51 static void change_annotation_level (void);
52 static void command_handler (char *command);
54 /* Signal handlers. */
56 static void handle_sigquit (int sig);
59 static void handle_sighup (int sig);
61 static void handle_sigfpe (int sig);
62 #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER)
63 static void handle_sigwinch (int sig);
66 /* Functions to be invoked by the event loop in response to
68 #if defined (SIGQUIT) || defined (SIGHUP)
69 static void async_do_nothing (gdb_client_data);
72 static void async_disconnect (gdb_client_data);
74 static void async_float_handler (gdb_client_data);
76 static void async_stop_sig (gdb_client_data);
79 /* Readline offers an alternate interface, via callback
80 functions. These are all included in the file callback.c in the
81 readline distribution. This file provides (mainly) a function, which
82 the event loop uses as callback (i.e. event handler) whenever an event
83 is detected on the standard input file descriptor.
84 readline_callback_read_char is called (by the GDB event loop) whenever
85 there is a new character ready on the input stream. This function
86 incrementally builds a buffer internal to readline where it
87 accumulates the line read up to the point of invocation. In the
88 special case in which the character read is newline, the function
89 invokes a GDB supplied callback routine, which does the processing of
90 a full command line. This latter routine is the asynchronous analog
91 of the old command_line_input in gdb. Instead of invoking (and waiting
92 for) readline to read the command line and pass it back to
93 command_loop for processing, the new command_line_handler function has
94 the command line already available as its parameter. INPUT_HANDLER is
95 to be set to the function that readline will invoke when a complete
96 line of input is ready. CALL_READLINE is to be set to the function
97 that readline offers as callback to the event_loop. */
99 void (*input_handler) (char *);
100 void (*call_readline) (gdb_client_data);
102 /* Important variables for the event loop. */
104 /* This is used to determine if GDB is using the readline library or
105 its own simplified form of readline. It is used by the asynchronous
106 form of the set editing command.
107 ezannoni: as of 1999-04-29 I expect that this
108 variable will not be used after gdb is changed to use the event
109 loop as default engine, and event-top.c is merged into top.c. */
110 int async_command_editing_p;
112 /* This variable contains the new prompt that the user sets with the
113 set prompt command. */
114 char *new_async_prompt;
116 /* This is the annotation suffix that will be used when the
117 annotation_level is 2. */
118 char *async_annotation_suffix;
120 /* This is used to display the notification of the completion of an
121 asynchronous execution command. */
122 int exec_done_display_p = 0;
124 /* This is the file descriptor for the input stream that GDB uses to
125 read commands from. */
128 /* This is the prompt stack. Prompts will be pushed on the stack as
129 needed by the different 'kinds' of user inputs GDB is asking
130 for. See event-loop.h. */
131 struct prompts the_prompts;
133 /* signal handling variables */
134 /* Each of these is a pointer to a function that the event loop will
135 invoke if the corresponding signal has received. The real signal
136 handlers mark these functions as ready to be executed and the event
137 loop, in a later iteration, calls them. See the function
138 invoke_async_signal_handler. */
147 #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER)
148 void *sigwinch_token;
154 /* Structure to save a partially entered command. This is used when
155 the user types '\' at the end of a command line. This is necessary
156 because each line of input is handled by a different call to
157 command_line_handler, and normally there is no state retained
158 between different calls. */
159 int more_to_come = 0;
161 struct readline_input_state
164 char *linebuffer_ptr;
166 readline_input_state;
168 /* This hook is called by rl_callback_read_char_wrapper after each
169 character is processed. */
170 void (*after_char_processing_hook) ();
173 /* Wrapper function for calling into the readline library. The event
174 loop expects the callback function to have a paramter, while readline
177 rl_callback_read_char_wrapper (gdb_client_data client_data)
179 rl_callback_read_char ();
180 if (after_char_processing_hook)
181 (*after_char_processing_hook) ();
184 /* Initialize all the necessary variables, start the event loop,
185 register readline, and stdin, start the loop. */
187 cli_command_loop (void)
189 /* If we are using readline, set things up and display the first
190 prompt, otherwise just print the prompt. */
191 if (async_command_editing_p)
195 char *gdb_prompt = get_prompt ();
197 /* Tell readline what the prompt to display is and what function it
198 will need to call after a whole line is read. This also displays
200 length = strlen (PREFIX (0))
201 + strlen (gdb_prompt) + strlen (SUFFIX (0)) + 1;
202 a_prompt = (char *) alloca (length);
203 strcpy (a_prompt, PREFIX (0));
204 strcat (a_prompt, gdb_prompt);
205 strcat (a_prompt, SUFFIX (0));
206 rl_callback_handler_install (a_prompt, input_handler);
209 display_gdb_prompt (0);
211 /* Now it's time to start the event loop. */
215 /* Change the function to be invoked every time there is a character
216 ready on stdin. This is used when the user sets the editing off,
217 therefore bypassing readline, and letting gdb handle the input
218 itself, via gdb_readline2. Also it is used in the opposite case in
219 which the user sets editing on again, by restoring readline
220 handling of the input. */
222 change_line_handler (void)
224 /* NOTE: this operates on input_fd, not instream. If we are reading
225 commands from a file, instream will point to the file. However in
226 async mode, we always read commands from a file with editing
227 off. This means that the 'set editing on/off' will have effect
228 only on the interactive session. */
230 if (async_command_editing_p)
232 /* Turn on editing by using readline. */
233 call_readline = rl_callback_read_char_wrapper;
234 input_handler = command_line_handler;
238 /* Turn off editing by using gdb_readline2. */
239 rl_callback_handler_remove ();
240 call_readline = gdb_readline2;
242 /* Set up the command handler as well, in case we are called as
243 first thing from .gdbinit. */
244 input_handler = command_line_handler;
248 /* Displays the prompt. The prompt that is displayed is the current
249 top of the prompt stack, if the argument NEW_PROMPT is
250 0. Otherwise, it displays whatever NEW_PROMPT is. This is used
251 after each gdb command has completed, and in the following cases:
252 1. when the user enters a command line which is ended by '\'
253 indicating that the command will continue on the next line.
254 In that case the prompt that is displayed is the empty string.
255 2. When the user is entering 'commands' for a breakpoint, or
256 actions for a tracepoint. In this case the prompt will be '>'
258 FIXME: 2. & 3. not implemented yet for async. */
260 display_gdb_prompt (char *new_prompt)
262 int prompt_length = 0;
263 char *gdb_prompt = get_prompt ();
265 /* Reset the nesting depth used when trace-commands is set. */
266 reset_command_nest_depth ();
268 /* Each interpreter has its own rules on displaying the command
270 if (!current_interp_display_prompt_p ())
273 if (target_executing && sync_execution)
275 /* This is to trick readline into not trying to display the
276 prompt. Even though we display the prompt using this
277 function, readline still tries to do its own display if we
278 don't call rl_callback_handler_install and
279 rl_callback_handler_remove (which readline detects because a
280 global variable is not set). If readline did that, it could
281 mess up gdb signal handlers for SIGINT. Readline assumes
282 that between calls to rl_set_signals and rl_clear_signals gdb
283 doesn't do anything with the signal handlers. Well, that's
284 not the case, because when the target executes we change the
285 SIGINT signal handler. If we allowed readline to display the
286 prompt, the signal handler change would happen exactly
287 between the calls to the above two functions.
288 Calling rl_callback_handler_remove(), does the job. */
290 rl_callback_handler_remove ();
296 /* Just use the top of the prompt stack. */
297 prompt_length = strlen (PREFIX (0)) +
298 strlen (SUFFIX (0)) +
299 strlen (gdb_prompt) + 1;
301 new_prompt = (char *) alloca (prompt_length);
303 /* Prefix needs to have new line at end. */
304 strcpy (new_prompt, PREFIX (0));
305 strcat (new_prompt, gdb_prompt);
306 /* Suffix needs to have a new line at end and \032 \032 at
308 strcat (new_prompt, SUFFIX (0));
311 if (async_command_editing_p)
313 rl_callback_handler_remove ();
314 rl_callback_handler_install (new_prompt, input_handler);
316 /* new_prompt at this point can be the top of the stack or the one passed in */
319 /* Don't use a _filtered function here. It causes the assumed
320 character position to be off, since the newline we read from
321 the user is not accounted for. */
322 fputs_unfiltered (new_prompt, gdb_stdout);
323 gdb_flush (gdb_stdout);
327 /* Used when the user requests a different annotation level, with
328 'set annotate'. It pushes a new prompt (with prefix and suffix) on top
329 of the prompt stack, if the annotation level desired is 2, otherwise
330 it pops the top of the prompt stack when we want the annotation level
331 to be the normal ones (1 or 0). */
333 change_annotation_level (void)
335 char *prefix, *suffix;
337 if (!PREFIX (0) || !PROMPT (0) || !SUFFIX (0))
339 /* The prompt stack has not been initialized to "", we are
340 using gdb w/o the --async switch */
341 warning (_("Command has same effect as set annotate"));
345 if (annotation_level > 1)
347 if (!strcmp (PREFIX (0), "") && !strcmp (SUFFIX (0), ""))
349 /* Push a new prompt if the previous annotation_level was not >1. */
350 prefix = (char *) alloca (strlen (async_annotation_suffix) + 10);
351 strcpy (prefix, "\n\032\032pre-");
352 strcat (prefix, async_annotation_suffix);
353 strcat (prefix, "\n");
355 suffix = (char *) alloca (strlen (async_annotation_suffix) + 6);
356 strcpy (suffix, "\n\032\032");
357 strcat (suffix, async_annotation_suffix);
358 strcat (suffix, "\n");
360 push_prompt (prefix, (char *) 0, suffix);
365 if (strcmp (PREFIX (0), "") && strcmp (SUFFIX (0), ""))
367 /* Pop the top of the stack, we are going back to annotation < 1. */
373 /* Pushes a new prompt on the prompt stack. Each prompt has three
374 parts: prefix, prompt, suffix. Usually prefix and suffix are empty
375 strings, except when the annotation level is 2. Memory is allocated
376 within savestring for the new prompt. */
378 push_prompt (char *prefix, char *prompt, char *suffix)
381 PREFIX (0) = savestring (prefix, strlen (prefix));
383 /* Note that this function is used by the set annotate 2
384 command. This is why we take care of saving the old prompt
385 in case a new one is not specified. */
387 PROMPT (0) = savestring (prompt, strlen (prompt));
389 PROMPT (0) = savestring (PROMPT (-1), strlen (PROMPT (-1)));
391 SUFFIX (0) = savestring (suffix, strlen (suffix));
394 /* Pops the top of the prompt stack, and frees the memory allocated for it. */
398 /* If we are not during a 'synchronous' execution command, in which
399 case, the top prompt would be empty. */
400 if (strcmp (PROMPT (0), ""))
401 /* This is for the case in which the prompt is set while the
402 annotation level is 2. The top prompt will be changed, but when
403 we return to annotation level < 2, we want that new prompt to be
404 in effect, until the user does another 'set prompt'. */
405 if (strcmp (PROMPT (0), PROMPT (-1)))
408 PROMPT (-1) = savestring (PROMPT (0), strlen (PROMPT (0)));
417 /* When there is an event ready on the stdin file desriptor, instead
418 of calling readline directly throught the callback function, or
419 instead of calling gdb_readline2, give gdb a chance to detect
420 errors and do something. */
422 stdin_event_handler (int error, gdb_client_data client_data)
426 printf_unfiltered (_("error detected on stdin\n"));
427 delete_file_handler (input_fd);
428 discard_all_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 *dummy)
443 /* See NOTE in async_disable_stdin() */
444 /* FIXME: cagney/1999-09-27: Call this before clearing
445 sync_execution. Current target_terminal_ours() implementations
446 check for sync_execution before switching the terminal. */
447 target_terminal_ours ();
452 /* Disable reads from stdin (the console) marking the command as
456 async_disable_stdin (void)
459 push_prompt ("", "", "");
460 /* FIXME: cagney/1999-09-27: At present this call is technically
461 redundant since infcmd.c and infrun.c both already call
462 target_terminal_inferior(). As the terminal handling (in
463 sync/async mode) is refined, the duplicate calls can be
464 eliminated (Here or in infcmd.c/infrun.c). */
465 target_terminal_inferior ();
466 /* Add the reinstate of stdin to the list of cleanups to be done
467 in case the target errors out and dies. These cleanups are also
468 done in case of normal successful termination of the execution
469 command, by complete_execution(). */
470 make_exec_error_cleanup (async_enable_stdin, NULL);
474 /* Handles a gdb command. This function is called by
475 command_line_handler, which has processed one or more input lines
477 /* NOTE: 1999-04-30 This is the asynchronous version of the command_loop
478 function. The command_loop function will be obsolete when we
479 switch to use the event loop at every execution of gdb. */
481 command_handler (char *command)
483 struct cleanup *old_chain;
484 int stdin_is_tty = ISATTY (stdin);
485 struct continuation_arg *arg1;
486 struct continuation_arg *arg2;
487 long time_at_cmd_start;
489 long space_at_cmd_start = 0;
491 extern int display_time;
492 extern int display_space;
495 if (instream == stdin && stdin_is_tty)
496 reinitialize_more_filter ();
497 old_chain = make_cleanup (null_cleanup, 0);
499 /* If readline returned a NULL command, it means that the
500 connection with the terminal is gone. This happens at the
501 end of a testsuite run, after Expect has hung up
502 but GDB is still alive. In such a case, we just quit gdb
503 killing the inferior program too. */
506 printf_unfiltered ("quit\n");
507 execute_command ("quit", stdin == instream);
510 time_at_cmd_start = get_run_time ();
515 char *lim = (char *) sbrk (0);
516 space_at_cmd_start = lim - lim_at_start;
520 execute_command (command, instream == stdin);
522 /* Set things up for this function to be compete later, once the
523 execution has completed, if we are doing an execution command,
524 otherwise, just go ahead and finish. */
525 if (target_can_async_p () && target_executing)
528 (struct continuation_arg *) xmalloc (sizeof (struct continuation_arg));
530 (struct continuation_arg *) xmalloc (sizeof (struct continuation_arg));
533 arg1->data.longint = time_at_cmd_start;
535 arg2->data.longint = space_at_cmd_start;
537 add_continuation (command_line_handler_continuation, arg1);
540 /* Do any commands attached to breakpoint we stopped at. Only if we
541 are always running synchronously. Or if we have just executed a
542 command that doesn't start the target. */
543 if (!target_can_async_p () || !target_executing)
545 bpstat_do_actions (&stop_bpstat);
546 do_cleanups (old_chain);
550 long cmd_time = get_run_time () - time_at_cmd_start;
552 printf_unfiltered (_("Command execution time: %ld.%06ld\n"),
553 cmd_time / 1000000, cmd_time % 1000000);
559 char *lim = (char *) sbrk (0);
560 long space_now = lim - lim_at_start;
561 long space_diff = space_now - space_at_cmd_start;
563 printf_unfiltered (_("Space used: %ld (%c%ld for this command)\n"),
565 (space_diff >= 0 ? '+' : '-'),
572 /* Do any commands attached to breakpoint we stopped at. Only if we
573 are always running synchronously. Or if we have just executed a
574 command that doesn't start the target. */
576 command_line_handler_continuation (struct continuation_arg *arg)
578 extern int display_time;
579 extern int display_space;
581 long time_at_cmd_start = arg->data.longint;
582 long space_at_cmd_start = arg->next->data.longint;
584 bpstat_do_actions (&stop_bpstat);
585 /*do_cleanups (old_chain); *//*?????FIXME????? */
589 long cmd_time = get_run_time () - time_at_cmd_start;
591 printf_unfiltered (_("Command execution time: %ld.%06ld\n"),
592 cmd_time / 1000000, cmd_time % 1000000);
597 char *lim = (char *) sbrk (0);
598 long space_now = lim - lim_at_start;
599 long space_diff = space_now - space_at_cmd_start;
601 printf_unfiltered (_("Space used: %ld (%c%ld for this command)\n"),
603 (space_diff >= 0 ? '+' : '-'),
609 /* Handle a complete line of input. This is called by the callback
610 mechanism within the readline library. Deal with incomplete commands
611 as well, by saving the partial input in a global buffer. */
613 /* NOTE: 1999-04-30 This is the asynchronous version of the
614 command_line_input function. command_line_input will become
615 obsolete once we use the event loop as the default mechanism in
618 command_line_handler (char *rl)
620 static char *linebuffer = 0;
621 static unsigned linelength = 0;
630 int repeat = (instream == stdin);
632 if (annotation_level > 1 && instream == stdin)
634 printf_unfiltered (("\n\032\032post-"));
635 puts_unfiltered (async_annotation_suffix);
636 printf_unfiltered (("\n"));
642 linebuffer = (char *) xmalloc (linelength);
649 strcpy (linebuffer, readline_input_state.linebuffer);
650 p = readline_input_state.linebuffer_ptr;
651 xfree (readline_input_state.linebuffer);
658 signal (STOP_SIGNAL, handle_stop_sig);
661 /* Make sure that all output has been output. Some machines may let
662 you get away with leaving out some of the gdb_flush, but not all. */
664 gdb_flush (gdb_stdout);
665 gdb_flush (gdb_stderr);
667 if (source_file_name != NULL)
668 ++source_line_number;
670 /* If we are in this case, then command_handler will call quit
671 and exit from gdb. */
672 if (!rl || rl == (char *) EOF)
677 if (strlen (rl) + 1 + (p - linebuffer) > linelength)
679 linelength = strlen (rl) + 1 + (p - linebuffer);
680 nline = (char *) xrealloc (linebuffer, linelength);
681 p += nline - linebuffer;
685 /* Copy line. Don't copy null at end. (Leaves line alone
686 if this was just a newline) */
690 xfree (rl); /* Allocated in readline. */
692 if (p > linebuffer && *(p - 1) == '\\')
694 p--; /* Put on top of '\'. */
696 readline_input_state.linebuffer = savestring (linebuffer,
697 strlen (linebuffer));
698 readline_input_state.linebuffer_ptr = p;
700 /* We will not invoke a execute_command if there is more
701 input expected to complete the command. So, we need to
702 print an empty prompt here. */
704 push_prompt ("", "", "");
705 display_gdb_prompt (0);
711 signal (STOP_SIGNAL, SIG_DFL);
714 #define SERVER_COMMAND_LENGTH 7
716 (p - linebuffer > SERVER_COMMAND_LENGTH)
717 && strncmp (linebuffer, "server ", SERVER_COMMAND_LENGTH) == 0;
720 /* Note that we don't set `line'. Between this and the check in
721 dont_repeat, this insures that repeating will still do the
724 command_handler (linebuffer + SERVER_COMMAND_LENGTH);
725 display_gdb_prompt (0);
729 /* Do history expansion if that is wished. */
730 if (history_expansion_p && instream == stdin
731 && ISATTY (instream))
736 *p = '\0'; /* Insert null now. */
737 expanded = history_expand (linebuffer, &history_value);
740 /* Print the changes. */
741 printf_unfiltered ("%s\n", history_value);
743 /* If there was an error, call this function again. */
746 xfree (history_value);
749 if (strlen (history_value) > linelength)
751 linelength = strlen (history_value) + 1;
752 linebuffer = (char *) xrealloc (linebuffer, linelength);
754 strcpy (linebuffer, history_value);
755 p = linebuffer + strlen (linebuffer);
756 xfree (history_value);
760 /* If we just got an empty line, and that is supposed
761 to repeat the previous command, return the value in the
763 if (repeat && p == linebuffer && *p != '\\')
765 command_handler (line);
766 display_gdb_prompt (0);
770 for (p1 = linebuffer; *p1 == ' ' || *p1 == '\t'; p1++);
773 command_handler (line);
774 display_gdb_prompt (0);
780 /* Add line to history if appropriate. */
781 if (instream == stdin
782 && ISATTY (stdin) && *linebuffer)
783 add_history (linebuffer);
785 /* Note: lines consisting solely of comments are added to the command
786 history. This is useful when you type a command, and then
787 realize you don't want to execute it quite yet. You can comment
788 out the command and then later fetch it from the value history
789 and remove the '#'. The kill ring is probably better, but some
790 people are in the habit of commenting things out. */
792 *p1 = '\0'; /* Found a comment. */
794 /* Save into global buffer if appropriate. */
797 if (linelength > linesize)
799 line = xrealloc (line, linelength);
800 linesize = linelength;
802 strcpy (line, linebuffer);
805 command_handler (line);
806 display_gdb_prompt (0);
811 command_handler (linebuffer);
812 display_gdb_prompt (0);
816 /* Does reading of input from terminal w/o the editing features
817 provided by the readline library. */
819 /* NOTE: 1999-04-30 Asynchronous version of gdb_readline. gdb_readline
820 will become obsolete when the event loop is made the default
821 execution for gdb. */
823 gdb_readline2 (gdb_client_data client_data)
828 int result_size = 80;
829 static int done_once = 0;
831 /* Unbuffer the input stream, so that, later on, the calls to fgetc
832 fetch only one char at the time from the stream. The fgetc's will
833 get up to the first newline, but there may be more chars in the
834 stream after '\n'. If we buffer the input and fgetc drains the
835 stream, getting stuff beyond the newline as well, a select, done
836 afterwards will not trigger. */
837 if (!done_once && !ISATTY (instream))
839 setbuf (instream, NULL);
843 result = (char *) xmalloc (result_size);
845 /* We still need the while loop here, even though it would seem
846 obvious to invoke gdb_readline2 at every character entered. If
847 not using the readline library, the terminal is in cooked mode,
848 which sends the characters all at once. Poll will notice that the
849 input fd has changed state only after enter is pressed. At this
850 point we still need to fetch all the chars entered. */
854 /* Read from stdin if we are executing a user defined command.
855 This is the right thing for prompt_for_continue, at least. */
856 c = fgetc (instream ? instream : stdin);
861 /* The last line does not end with a newline. Return it, and
862 if we are called again fgetc will still return EOF and
863 we'll return NULL then. */
866 (*input_handler) (0);
871 if (input_index > 0 && result[input_index - 1] == '\r')
876 result[input_index++] = c;
877 while (input_index >= result_size)
880 result = (char *) xrealloc (result, result_size);
884 result[input_index++] = '\0';
885 (*input_handler) (result);
889 /* Initialization of signal handlers and tokens. There is a function
890 handle_sig* for each of the signals GDB cares about. Specifically:
891 SIGINT, SIGFPE, SIGQUIT, SIGTSTP, SIGHUP, SIGWINCH. These
892 functions are the actual signal handlers associated to the signals
893 via calls to signal(). The only job for these functions is to
894 enqueue the appropriate event/procedure with the event loop. Such
895 procedures are the old signal handlers. The event loop will take
896 care of invoking the queued procedures to perform the usual tasks
897 associated with the reception of the signal. */
898 /* NOTE: 1999-04-30 This is the asynchronous version of init_signals.
899 init_signals will become obsolete as we move to have to event loop
900 as the default for gdb. */
902 async_init_signals (void)
904 signal (SIGINT, handle_sigint);
906 create_async_signal_handler (async_request_quit, NULL);
907 signal (SIGTERM, handle_sigterm);
909 /* If SIGTRAP was set to SIG_IGN, then the SIG_IGN will get passed
910 to the inferior and breakpoints will be ignored. */
912 signal (SIGTRAP, SIG_DFL);
916 /* If we initialize SIGQUIT to SIG_IGN, then the SIG_IGN will get
917 passed to the inferior, which we don't want. It would be
918 possible to do a "signal (SIGQUIT, SIG_DFL)" after we fork, but
919 on BSD4.3 systems using vfork, that can affect the
920 GDB process as well as the inferior (the signal handling tables
921 might be in memory, shared between the two). Since we establish
922 a handler for SIGQUIT, when we call exec it will set the signal
923 to SIG_DFL for us. */
924 signal (SIGQUIT, handle_sigquit);
926 create_async_signal_handler (async_do_nothing, NULL);
929 if (signal (SIGHUP, handle_sighup) != SIG_IGN)
931 create_async_signal_handler (async_disconnect, NULL);
934 create_async_signal_handler (async_do_nothing, NULL);
936 signal (SIGFPE, handle_sigfpe);
938 create_async_signal_handler (async_float_handler, NULL);
940 #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER)
941 signal (SIGWINCH, handle_sigwinch);
943 create_async_signal_handler (SIGWINCH_HANDLER, NULL);
947 create_async_signal_handler (async_stop_sig, NULL);
953 mark_async_signal_handler_wrapper (void *token)
955 mark_async_signal_handler ((struct async_signal_handler *) token);
958 /* Tell the event loop what to do if SIGINT is received.
959 See event-signal.c. */
961 handle_sigint (int sig)
963 signal (sig, handle_sigint);
965 /* We could be running in a loop reading in symfiles or something so
966 it may be quite a while before we get back to the event loop. So
967 set quit_flag to 1 here. Then if QUIT is called before we get to
968 the event loop, we will unwind as expected. */
972 /* If immediate_quit is set, we go ahead and process the SIGINT right
973 away, even if we usually would defer this to the event loop. The
974 assumption here is that it is safe to process ^C immediately if
975 immediate_quit is set. If we didn't, SIGINT would be really
976 processed only the next time through the event loop. To get to
977 that point, though, the command that we want to interrupt needs to
978 finish first, which is unacceptable. */
980 async_request_quit (0);
982 /* If immediate quit is not set, we process SIGINT the next time
983 through the loop, which is fine. */
984 mark_async_signal_handler_wrapper (sigint_token);
987 /* Quit GDB if SIGTERM is received.
988 GDB would quit anyway, but this way it will clean up properly. */
990 handle_sigterm (int sig)
992 signal (sig, handle_sigterm);
993 quit_force ((char *) 0, stdin == instream);
996 /* Do the quit. All the checks have been done by the caller. */
998 async_request_quit (gdb_client_data arg)
1000 /* If the quit_flag has gotten reset back to 0 by the time we get
1001 back here, that means that an exception was thrown to unwind the
1002 current command before we got back to the event loop. So there
1003 is no reason to call quit again here, unless immediate_quit is
1006 if (quit_flag || immediate_quit)
1011 /* Tell the event loop what to do if SIGQUIT is received.
1012 See event-signal.c. */
1014 handle_sigquit (int sig)
1016 mark_async_signal_handler_wrapper (sigquit_token);
1017 signal (sig, handle_sigquit);
1021 #if defined (SIGQUIT) || defined (SIGHUP)
1022 /* Called by the event loop in response to a SIGQUIT or an
1025 async_do_nothing (gdb_client_data arg)
1027 /* Empty function body. */
1032 /* Tell the event loop what to do if SIGHUP is received.
1033 See event-signal.c. */
1035 handle_sighup (int sig)
1037 mark_async_signal_handler_wrapper (sighup_token);
1038 signal (sig, handle_sighup);
1041 /* Called by the event loop to process a SIGHUP */
1043 async_disconnect (gdb_client_data arg)
1045 catch_errors (quit_cover, NULL,
1046 "Could not kill the program being debugged",
1048 signal (SIGHUP, SIG_DFL); /*FIXME: ??????????? */
1049 kill (getpid (), SIGHUP);
1055 handle_stop_sig (int sig)
1057 mark_async_signal_handler_wrapper (sigtstp_token);
1058 signal (sig, handle_stop_sig);
1062 async_stop_sig (gdb_client_data arg)
1064 char *prompt = get_prompt ();
1065 #if STOP_SIGNAL == SIGTSTP
1066 signal (SIGTSTP, SIG_DFL);
1067 #if HAVE_SIGPROCMASK
1071 sigemptyset (&zero);
1072 sigprocmask (SIG_SETMASK, &zero, 0);
1074 #elif HAVE_SIGSETMASK
1077 kill (getpid (), SIGTSTP);
1078 signal (SIGTSTP, handle_stop_sig);
1080 signal (STOP_SIGNAL, handle_stop_sig);
1082 printf_unfiltered ("%s", prompt);
1083 gdb_flush (gdb_stdout);
1085 /* Forget about any previous command -- null line now will do nothing. */
1088 #endif /* STOP_SIGNAL */
1090 /* Tell the event loop what to do if SIGFPE is received.
1091 See event-signal.c. */
1093 handle_sigfpe (int sig)
1095 mark_async_signal_handler_wrapper (sigfpe_token);
1096 signal (sig, handle_sigfpe);
1099 /* Event loop will call this functin to process a SIGFPE. */
1101 async_float_handler (gdb_client_data arg)
1103 /* This message is based on ANSI C, section 4.7. Note that integer
1104 divide by zero causes this, so "float" is a misnomer. */
1105 error (_("Erroneous arithmetic operation."));
1108 /* Tell the event loop what to do if SIGWINCH is received.
1109 See event-signal.c. */
1110 #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER)
1112 handle_sigwinch (int sig)
1114 mark_async_signal_handler_wrapper (sigwinch_token);
1115 signal (sig, handle_sigwinch);
1120 /* Called by do_setshow_command. */
1122 set_async_editing_command (char *args, int from_tty, struct cmd_list_element *c)
1124 change_line_handler ();
1127 /* Called by do_setshow_command. */
1129 set_async_annotation_level (char *args, int from_tty, struct cmd_list_element *c)
1131 change_annotation_level ();
1134 /* Called by do_setshow_command. */
1136 set_async_prompt (char *args, int from_tty, struct cmd_list_element *c)
1138 PROMPT (0) = savestring (new_async_prompt, strlen (new_async_prompt));
1141 /* Set things up for readline to be invoked via the alternate
1142 interface, i.e. via a callback function (rl_callback_read_char),
1143 and hook up instream to the event loop. */
1145 gdb_setup_readline (void)
1147 /* This function is a noop for the sync case. The assumption is
1148 that the sync setup is ALL done in gdb_init, and we would only
1149 mess it up here. The sync stuff should really go away over
1151 extern int batch_silent;
1154 gdb_stdout = stdio_fileopen (stdout);
1155 gdb_stderr = stdio_fileopen (stderr);
1156 gdb_stdlog = gdb_stderr; /* for moment */
1157 gdb_stdtarg = gdb_stderr; /* for moment */
1159 /* If the input stream is connected to a terminal, turn on
1161 if (ISATTY (instream))
1163 /* Tell gdb that we will be using the readline library. This
1164 could be overwritten by a command in .gdbinit like 'set
1165 editing on' or 'off'. */
1166 async_command_editing_p = 1;
1168 /* When a character is detected on instream by select or poll,
1169 readline will be invoked via this callback function. */
1170 call_readline = rl_callback_read_char_wrapper;
1174 async_command_editing_p = 0;
1175 call_readline = gdb_readline2;
1178 /* When readline has read an end-of-line character, it passes the
1179 complete line to gdb for processing. command_line_handler is the
1180 function that does this. */
1181 input_handler = command_line_handler;
1183 /* Tell readline to use the same input stream that gdb uses. */
1184 rl_instream = instream;
1186 /* Get a file descriptor for the input stream, so that we can
1187 register it with the event loop. */
1188 input_fd = fileno (instream);
1190 /* Now we need to create the event sources for the input file
1192 /* At this point in time, this is the only event source that we
1193 register with the even loop. Another source is going to be the
1194 target program (inferior), but that must be registered only when
1195 it actually exists (I.e. after we say 'run' or after we connect
1196 to a remote target. */
1197 add_file_handler (input_fd, stdin_event_handler, 0);
1200 /* Disable command input through the standard CLI channels. Used in
1201 the suspend proc for interpreters that use the standard gdb readline
1202 interface, like the cli & the mi. */
1204 gdb_disable_readline (void)
1206 /* FIXME - It is too heavyweight to delete and remake these every
1207 time you run an interpreter that needs readline. It is probably
1208 better to have the interpreters cache these, which in turn means
1209 that this needs to be moved into interpreter specific code. */
1212 ui_file_delete (gdb_stdout);
1213 ui_file_delete (gdb_stderr);
1218 rl_callback_handler_remove ();
1219 delete_file_handler (input_fd);