1 /* Top level stuff for GDB, the GNU debugger.
3 Copyright 1999, 2000, 2001, 2002, 2004, 2005 Free Software
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., 59 Temple Place - Suite 330,
23 Boston, MA 02111-1307, USA. */
29 #include "terminal.h" /* for job_control */
30 #include "event-loop.h"
31 #include "event-top.h"
34 #include "exceptions.h"
36 /* For dont_repeat() */
39 /* readline include files */
40 #include "readline/readline.h"
41 #include "readline/history.h"
43 /* readline defines this. */
46 static void rl_callback_read_char_wrapper (gdb_client_data client_data);
47 static void command_line_handler (char *rl);
48 static void command_line_handler_continuation (struct continuation_arg *arg);
49 static void change_line_handler (void);
50 static void change_annotation_level (void);
51 static void command_handler (char *command);
52 static void async_do_nothing (gdb_client_data arg);
53 static void async_disconnect (gdb_client_data arg);
54 static void async_stop_sig (gdb_client_data arg);
55 static void async_float_handler (gdb_client_data arg);
57 /* Signal handlers. */
58 static void handle_sigquit (int sig);
59 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 static void async_do_nothing (gdb_client_data);
68 static void async_disconnect (gdb_client_data);
69 static void async_float_handler (gdb_client_data);
70 static void async_stop_sig (gdb_client_data);
72 /* Readline offers an alternate interface, via callback
73 functions. These are all included in the file callback.c in the
74 readline distribution. This file provides (mainly) a function, which
75 the event loop uses as callback (i.e. event handler) whenever an event
76 is detected on the standard input file descriptor.
77 readline_callback_read_char is called (by the GDB event loop) whenever
78 there is a new character ready on the input stream. This function
79 incrementally builds a buffer internal to readline where it
80 accumulates the line read up to the point of invocation. In the
81 special case in which the character read is newline, the function
82 invokes a GDB supplied callback routine, which does the processing of
83 a full command line. This latter routine is the asynchronous analog
84 of the old command_line_input in gdb. Instead of invoking (and waiting
85 for) readline to read the command line and pass it back to
86 command_loop for processing, the new command_line_handler function has
87 the command line already available as its parameter. INPUT_HANDLER is
88 to be set to the function that readline will invoke when a complete
89 line of input is ready. CALL_READLINE is to be set to the function
90 that readline offers as callback to the event_loop. */
92 void (*input_handler) (char *);
93 void (*call_readline) (gdb_client_data);
95 /* Important variables for the event loop. */
97 /* This is used to determine if GDB is using the readline library or
98 its own simplified form of readline. It is used by the asynchronous
99 form of the set editing command.
100 ezannoni: as of 1999-04-29 I expect that this
101 variable will not be used after gdb is changed to use the event
102 loop as default engine, and event-top.c is merged into top.c. */
103 int async_command_editing_p;
105 /* This variable contains the new prompt that the user sets with the
106 set prompt command. */
107 char *new_async_prompt;
109 /* This is the annotation suffix that will be used when the
110 annotation_level is 2. */
111 char *async_annotation_suffix;
113 /* This is used to display the notification of the completion of an
114 asynchronous execution command. */
115 int exec_done_display_p = 0;
117 /* This is the file descriptor for the input stream that GDB uses to
118 read commands from. */
121 /* This is the prompt stack. Prompts will be pushed on the stack as
122 needed by the different 'kinds' of user inputs GDB is asking
123 for. See event-loop.h. */
124 struct prompts the_prompts;
126 /* signal handling variables */
127 /* Each of these is a pointer to a function that the event loop will
128 invoke if the corresponding signal has received. The real signal
129 handlers mark these functions as ready to be executed and the event
130 loop, in a later iteration, calls them. See the function
131 invoke_async_signal_handler. */
138 #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER)
139 void *sigwinch_token;
145 /* Structure to save a partially entered command. This is used when
146 the user types '\' at the end of a command line. This is necessary
147 because each line of input is handled by a different call to
148 command_line_handler, and normally there is no state retained
149 between different calls. */
150 int more_to_come = 0;
152 struct readline_input_state
155 char *linebuffer_ptr;
157 readline_input_state;
159 /* This hook is called by rl_callback_read_char_wrapper after each
160 character is processed. */
161 void (*after_char_processing_hook) ();
164 /* Wrapper function for calling into the readline library. The event
165 loop expects the callback function to have a paramter, while readline
168 rl_callback_read_char_wrapper (gdb_client_data client_data)
170 rl_callback_read_char ();
171 if (after_char_processing_hook)
172 (*after_char_processing_hook) ();
175 /* Initialize all the necessary variables, start the event loop,
176 register readline, and stdin, start the loop. */
178 cli_command_loop (void)
182 char *gdb_prompt = get_prompt ();
184 /* If we are using readline, set things up and display the first
185 prompt, otherwise just print the prompt. */
186 if (async_command_editing_p)
188 /* Tell readline what the prompt to display is and what function it
189 will need to call after a whole line is read. This also displays
191 length = strlen (PREFIX (0)) + strlen (gdb_prompt) + strlen (SUFFIX (0)) + 1;
192 a_prompt = (char *) xmalloc (length);
193 strcpy (a_prompt, PREFIX (0));
194 strcat (a_prompt, gdb_prompt);
195 strcat (a_prompt, SUFFIX (0));
196 rl_callback_handler_install (a_prompt, input_handler);
199 display_gdb_prompt (0);
201 /* Now it's time to start the event loop. */
205 /* Change the function to be invoked every time there is a character
206 ready on stdin. This is used when the user sets the editing off,
207 therefore bypassing readline, and letting gdb handle the input
208 itself, via gdb_readline2. Also it is used in the opposite case in
209 which the user sets editing on again, by restoring readline
210 handling of the input. */
212 change_line_handler (void)
214 /* NOTE: this operates on input_fd, not instream. If we are reading
215 commands from a file, instream will point to the file. However in
216 async mode, we always read commands from a file with editing
217 off. This means that the 'set editing on/off' will have effect
218 only on the interactive session. */
220 if (async_command_editing_p)
222 /* Turn on editing by using readline. */
223 call_readline = rl_callback_read_char_wrapper;
224 input_handler = command_line_handler;
228 /* Turn off editing by using gdb_readline2. */
229 rl_callback_handler_remove ();
230 call_readline = gdb_readline2;
232 /* Set up the command handler as well, in case we are called as
233 first thing from .gdbinit. */
234 input_handler = command_line_handler;
238 /* Displays the prompt. The prompt that is displayed is the current
239 top of the prompt stack, if the argument NEW_PROMPT is
240 0. Otherwise, it displays whatever NEW_PROMPT is. This is used
241 after each gdb command has completed, and in the following cases:
242 1. when the user enters a command line which is ended by '\'
243 indicating that the command will continue on the next line.
244 In that case the prompt that is displayed is the empty string.
245 2. When the user is entering 'commands' for a breakpoint, or
246 actions for a tracepoint. In this case the prompt will be '>'
248 FIXME: 2. & 3. not implemented yet for async. */
250 display_gdb_prompt (char *new_prompt)
252 int prompt_length = 0;
253 char *gdb_prompt = get_prompt ();
255 /* Each interpreter has its own rules on displaying the command
257 if (!current_interp_display_prompt_p ())
260 if (target_executing && sync_execution)
262 /* This is to trick readline into not trying to display the
263 prompt. Even though we display the prompt using this
264 function, readline still tries to do its own display if we
265 don't call rl_callback_handler_install and
266 rl_callback_handler_remove (which readline detects because a
267 global variable is not set). If readline did that, it could
268 mess up gdb signal handlers for SIGINT. Readline assumes
269 that between calls to rl_set_signals and rl_clear_signals gdb
270 doesn't do anything with the signal handlers. Well, that's
271 not the case, because when the target executes we change the
272 SIGINT signal handler. If we allowed readline to display the
273 prompt, the signal handler change would happen exactly
274 between the calls to the above two functions.
275 Calling rl_callback_handler_remove(), does the job. */
277 rl_callback_handler_remove ();
283 /* Just use the top of the prompt stack. */
284 prompt_length = strlen (PREFIX (0)) +
285 strlen (SUFFIX (0)) +
286 strlen (gdb_prompt) + 1;
288 new_prompt = (char *) alloca (prompt_length);
290 /* Prefix needs to have new line at end. */
291 strcpy (new_prompt, PREFIX (0));
292 strcat (new_prompt, gdb_prompt);
293 /* Suffix needs to have a new line at end and \032 \032 at
295 strcat (new_prompt, SUFFIX (0));
298 if (async_command_editing_p)
300 rl_callback_handler_remove ();
301 rl_callback_handler_install (new_prompt, input_handler);
303 /* new_prompt at this point can be the top of the stack or the one passed in */
306 /* Don't use a _filtered function here. It causes the assumed
307 character position to be off, since the newline we read from
308 the user is not accounted for. */
309 fputs_unfiltered (new_prompt, gdb_stdout);
310 gdb_flush (gdb_stdout);
314 /* Used when the user requests a different annotation level, with
315 'set annotate'. It pushes a new prompt (with prefix and suffix) on top
316 of the prompt stack, if the annotation level desired is 2, otherwise
317 it pops the top of the prompt stack when we want the annotation level
318 to be the normal ones (1 or 0). */
320 change_annotation_level (void)
322 char *prefix, *suffix;
324 if (!PREFIX (0) || !PROMPT (0) || !SUFFIX (0))
326 /* The prompt stack has not been initialized to "", we are
327 using gdb w/o the --async switch */
328 warning (_("Command has same effect as set annotate"));
332 if (annotation_level > 1)
334 if (!strcmp (PREFIX (0), "") && !strcmp (SUFFIX (0), ""))
336 /* Push a new prompt if the previous annotation_level was not >1. */
337 prefix = (char *) alloca (strlen (async_annotation_suffix) + 10);
338 strcpy (prefix, "\n\032\032pre-");
339 strcat (prefix, async_annotation_suffix);
340 strcat (prefix, "\n");
342 suffix = (char *) alloca (strlen (async_annotation_suffix) + 6);
343 strcpy (suffix, "\n\032\032");
344 strcat (suffix, async_annotation_suffix);
345 strcat (suffix, "\n");
347 push_prompt (prefix, (char *) 0, suffix);
352 if (strcmp (PREFIX (0), "") && strcmp (SUFFIX (0), ""))
354 /* Pop the top of the stack, we are going back to annotation < 1. */
360 /* Pushes a new prompt on the prompt stack. Each prompt has three
361 parts: prefix, prompt, suffix. Usually prefix and suffix are empty
362 strings, except when the annotation level is 2. Memory is allocated
363 within savestring for the new prompt. */
365 push_prompt (char *prefix, char *prompt, char *suffix)
368 PREFIX (0) = savestring (prefix, strlen (prefix));
370 /* Note that this function is used by the set annotate 2
371 command. This is why we take care of saving the old prompt
372 in case a new one is not specified. */
374 PROMPT (0) = savestring (prompt, strlen (prompt));
376 PROMPT (0) = savestring (PROMPT (-1), strlen (PROMPT (-1)));
378 SUFFIX (0) = savestring (suffix, strlen (suffix));
381 /* Pops the top of the prompt stack, and frees the memory allocated for it. */
385 /* If we are not during a 'synchronous' execution command, in which
386 case, the top prompt would be empty. */
387 if (strcmp (PROMPT (0), ""))
388 /* This is for the case in which the prompt is set while the
389 annotation level is 2. The top prompt will be changed, but when
390 we return to annotation level < 2, we want that new prompt to be
391 in effect, until the user does another 'set prompt'. */
392 if (strcmp (PROMPT (0), PROMPT (-1)))
395 PROMPT (-1) = savestring (PROMPT (0), strlen (PROMPT (0)));
404 /* When there is an event ready on the stdin file desriptor, instead
405 of calling readline directly throught the callback function, or
406 instead of calling gdb_readline2, give gdb a chance to detect
407 errors and do something. */
409 stdin_event_handler (int error, gdb_client_data client_data)
413 printf_unfiltered ("error detected on stdin\n");
414 delete_file_handler (input_fd);
415 discard_all_continuations ();
416 /* If stdin died, we may as well kill gdb. */
417 quit_command ((char *) 0, stdin == instream);
420 (*call_readline) (client_data);
423 /* Re-enable stdin after the end of an execution command in
424 synchronous mode, or after an error from the target, and we aborted
425 the exec operation. */
428 async_enable_stdin (void *dummy)
430 /* See NOTE in async_disable_stdin() */
431 /* FIXME: cagney/1999-09-27: Call this before clearing
432 sync_execution. Current target_terminal_ours() implementations
433 check for sync_execution before switching the terminal. */
434 target_terminal_ours ();
439 /* Disable reads from stdin (the console) marking the command as
443 async_disable_stdin (void)
446 push_prompt ("", "", "");
447 /* FIXME: cagney/1999-09-27: At present this call is technically
448 redundant since infcmd.c and infrun.c both already call
449 target_terminal_inferior(). As the terminal handling (in
450 sync/async mode) is refined, the duplicate calls can be
451 eliminated (Here or in infcmd.c/infrun.c). */
452 target_terminal_inferior ();
453 /* Add the reinstate of stdin to the list of cleanups to be done
454 in case the target errors out and dies. These cleanups are also
455 done in case of normal successful termination of the execution
456 command, by complete_execution(). */
457 make_exec_error_cleanup (async_enable_stdin, NULL);
461 /* Handles a gdb command. This function is called by
462 command_line_handler, which has processed one or more input lines
464 /* NOTE: 1999-04-30 This is the asynchronous version of the command_loop
465 function. The command_loop function will be obsolete when we
466 switch to use the event loop at every execution of gdb. */
468 command_handler (char *command)
470 struct cleanup *old_chain;
471 int stdin_is_tty = ISATTY (stdin);
472 struct continuation_arg *arg1;
473 struct continuation_arg *arg2;
474 long time_at_cmd_start;
476 long space_at_cmd_start = 0;
478 extern int display_time;
479 extern int display_space;
482 if (instream == stdin && stdin_is_tty)
483 reinitialize_more_filter ();
484 old_chain = make_cleanup (null_cleanup, 0);
486 /* If readline returned a NULL command, it means that the
487 connection with the terminal is gone. This happens at the
488 end of a testsuite run, after Expect has hung up
489 but GDB is still alive. In such a case, we just quit gdb
490 killing the inferior program too. */
492 quit_command ((char *) 0, stdin == instream);
494 time_at_cmd_start = get_run_time ();
499 char *lim = (char *) sbrk (0);
500 space_at_cmd_start = lim - lim_at_start;
504 execute_command (command, instream == stdin);
506 /* Set things up for this function to be compete later, once the
507 execution has completed, if we are doing an execution command,
508 otherwise, just go ahead and finish. */
509 if (target_can_async_p () && target_executing)
512 (struct continuation_arg *) xmalloc (sizeof (struct continuation_arg));
514 (struct continuation_arg *) xmalloc (sizeof (struct continuation_arg));
517 arg1->data.longint = time_at_cmd_start;
519 arg2->data.longint = space_at_cmd_start;
521 add_continuation (command_line_handler_continuation, arg1);
524 /* Do any commands attached to breakpoint we stopped at. Only if we
525 are always running synchronously. Or if we have just executed a
526 command that doesn't start the target. */
527 if (!target_can_async_p () || !target_executing)
529 bpstat_do_actions (&stop_bpstat);
530 do_cleanups (old_chain);
534 long cmd_time = get_run_time () - time_at_cmd_start;
536 printf_unfiltered ("Command execution time: %ld.%06ld\n",
537 cmd_time / 1000000, cmd_time % 1000000);
543 char *lim = (char *) sbrk (0);
544 long space_now = lim - lim_at_start;
545 long space_diff = space_now - space_at_cmd_start;
547 printf_unfiltered ("Space used: %ld (%c%ld for this command)\n",
549 (space_diff >= 0 ? '+' : '-'),
556 /* Do any commands attached to breakpoint we stopped at. Only if we
557 are always running synchronously. Or if we have just executed a
558 command that doesn't start the target. */
560 command_line_handler_continuation (struct continuation_arg *arg)
562 extern int display_time;
563 extern int display_space;
565 long time_at_cmd_start = arg->data.longint;
566 long space_at_cmd_start = arg->next->data.longint;
568 bpstat_do_actions (&stop_bpstat);
569 /*do_cleanups (old_chain); *//*?????FIXME????? */
573 long cmd_time = get_run_time () - time_at_cmd_start;
575 printf_unfiltered ("Command execution time: %ld.%06ld\n",
576 cmd_time / 1000000, cmd_time % 1000000);
581 char *lim = (char *) sbrk (0);
582 long space_now = lim - lim_at_start;
583 long space_diff = space_now - space_at_cmd_start;
585 printf_unfiltered ("Space used: %ld (%c%ld for this command)\n",
587 (space_diff >= 0 ? '+' : '-'),
593 /* Handle a complete line of input. This is called by the callback
594 mechanism within the readline library. Deal with incomplete commands
595 as well, by saving the partial input in a global buffer. */
597 /* NOTE: 1999-04-30 This is the asynchronous version of the
598 command_line_input function. command_line_input will become
599 obsolete once we use the event loop as the default mechanism in
602 command_line_handler (char *rl)
604 static char *linebuffer = 0;
605 static unsigned linelength = 0;
614 int repeat = (instream == stdin);
616 if (annotation_level > 1 && instream == stdin)
618 printf_unfiltered ("\n\032\032post-");
619 puts_unfiltered (async_annotation_suffix);
620 printf_unfiltered ("\n");
626 linebuffer = (char *) xmalloc (linelength);
633 strcpy (linebuffer, readline_input_state.linebuffer);
634 p = readline_input_state.linebuffer_ptr;
635 xfree (readline_input_state.linebuffer);
642 signal (STOP_SIGNAL, handle_stop_sig);
645 /* Make sure that all output has been output. Some machines may let
646 you get away with leaving out some of the gdb_flush, but not all. */
648 gdb_flush (gdb_stdout);
649 gdb_flush (gdb_stderr);
651 if (source_file_name != NULL)
652 ++source_line_number;
654 /* If we are in this case, then command_handler will call quit
655 and exit from gdb. */
656 if (!rl || rl == (char *) EOF)
661 if (strlen (rl) + 1 + (p - linebuffer) > linelength)
663 linelength = strlen (rl) + 1 + (p - linebuffer);
664 nline = (char *) xrealloc (linebuffer, linelength);
665 p += nline - linebuffer;
669 /* Copy line. Don't copy null at end. (Leaves line alone
670 if this was just a newline) */
674 xfree (rl); /* Allocated in readline. */
676 if (p > linebuffer && *(p - 1) == '\\')
678 p--; /* Put on top of '\'. */
680 readline_input_state.linebuffer = savestring (linebuffer,
681 strlen (linebuffer));
682 readline_input_state.linebuffer_ptr = p;
684 /* We will not invoke a execute_command if there is more
685 input expected to complete the command. So, we need to
686 print an empty prompt here. */
688 push_prompt ("", "", "");
689 display_gdb_prompt (0);
695 signal (STOP_SIGNAL, SIG_DFL);
698 #define SERVER_COMMAND_LENGTH 7
700 (p - linebuffer > SERVER_COMMAND_LENGTH)
701 && strncmp (linebuffer, "server ", SERVER_COMMAND_LENGTH) == 0;
704 /* Note that we don't set `line'. Between this and the check in
705 dont_repeat, this insures that repeating will still do the
708 command_handler (linebuffer + SERVER_COMMAND_LENGTH);
709 display_gdb_prompt (0);
713 /* Do history expansion if that is wished. */
714 if (history_expansion_p && instream == stdin
715 && ISATTY (instream))
720 *p = '\0'; /* Insert null now. */
721 expanded = history_expand (linebuffer, &history_value);
724 /* Print the changes. */
725 printf_unfiltered ("%s\n", history_value);
727 /* If there was an error, call this function again. */
730 xfree (history_value);
733 if (strlen (history_value) > linelength)
735 linelength = strlen (history_value) + 1;
736 linebuffer = (char *) xrealloc (linebuffer, linelength);
738 strcpy (linebuffer, history_value);
739 p = linebuffer + strlen (linebuffer);
740 xfree (history_value);
744 /* If we just got an empty line, and that is supposed
745 to repeat the previous command, return the value in the
747 if (repeat && p == linebuffer && *p != '\\')
749 command_handler (line);
750 display_gdb_prompt (0);
754 for (p1 = linebuffer; *p1 == ' ' || *p1 == '\t'; p1++);
757 command_handler (line);
758 display_gdb_prompt (0);
764 /* Add line to history if appropriate. */
765 if (instream == stdin
766 && ISATTY (stdin) && *linebuffer)
767 add_history (linebuffer);
769 /* Note: lines consisting solely of comments are added to the command
770 history. This is useful when you type a command, and then
771 realize you don't want to execute it quite yet. You can comment
772 out the command and then later fetch it from the value history
773 and remove the '#'. The kill ring is probably better, but some
774 people are in the habit of commenting things out. */
776 *p1 = '\0'; /* Found a comment. */
778 /* Save into global buffer if appropriate. */
781 if (linelength > linesize)
783 line = xrealloc (line, linelength);
784 linesize = linelength;
786 strcpy (line, linebuffer);
789 command_handler (line);
790 display_gdb_prompt (0);
795 command_handler (linebuffer);
796 display_gdb_prompt (0);
800 /* Does reading of input from terminal w/o the editing features
801 provided by the readline library. */
803 /* NOTE: 1999-04-30 Asynchronous version of gdb_readline. gdb_readline
804 will become obsolete when the event loop is made the default
805 execution for gdb. */
807 gdb_readline2 (gdb_client_data client_data)
812 int result_size = 80;
813 static int done_once = 0;
815 /* Unbuffer the input stream, so that, later on, the calls to fgetc
816 fetch only one char at the time from the stream. The fgetc's will
817 get up to the first newline, but there may be more chars in the
818 stream after '\n'. If we buffer the input and fgetc drains the
819 stream, getting stuff beyond the newline as well, a select, done
820 afterwards will not trigger. */
821 if (!done_once && !ISATTY (instream))
823 setbuf (instream, NULL);
827 result = (char *) xmalloc (result_size);
829 /* We still need the while loop here, even though it would seem
830 obvious to invoke gdb_readline2 at every character entered. If
831 not using the readline library, the terminal is in cooked mode,
832 which sends the characters all at once. Poll will notice that the
833 input fd has changed state only after enter is pressed. At this
834 point we still need to fetch all the chars entered. */
838 /* Read from stdin if we are executing a user defined command.
839 This is the right thing for prompt_for_continue, at least. */
840 c = fgetc (instream ? instream : stdin);
845 /* The last line does not end with a newline. Return it, and
846 if we are called again fgetc will still return EOF and
847 we'll return NULL then. */
850 (*input_handler) (0);
855 if (input_index > 0 && result[input_index - 1] == '\r')
860 result[input_index++] = c;
861 while (input_index >= result_size)
864 result = (char *) xrealloc (result, result_size);
868 result[input_index++] = '\0';
869 (*input_handler) (result);
873 /* Initialization of signal handlers and tokens. There is a function
874 handle_sig* for each of the signals GDB cares about. Specifically:
875 SIGINT, SIGFPE, SIGQUIT, SIGTSTP, SIGHUP, SIGWINCH. These
876 functions are the actual signal handlers associated to the signals
877 via calls to signal(). The only job for these functions is to
878 enqueue the appropriate event/procedure with the event loop. Such
879 procedures are the old signal handlers. The event loop will take
880 care of invoking the queued procedures to perform the usual tasks
881 associated with the reception of the signal. */
882 /* NOTE: 1999-04-30 This is the asynchronous version of init_signals.
883 init_signals will become obsolete as we move to have to event loop
884 as the default for gdb. */
886 async_init_signals (void)
888 signal (SIGINT, handle_sigint);
890 create_async_signal_handler (async_request_quit, NULL);
892 /* If SIGTRAP was set to SIG_IGN, then the SIG_IGN will get passed
893 to the inferior and breakpoints will be ignored. */
895 signal (SIGTRAP, SIG_DFL);
898 /* If we initialize SIGQUIT to SIG_IGN, then the SIG_IGN will get
899 passed to the inferior, which we don't want. It would be
900 possible to do a "signal (SIGQUIT, SIG_DFL)" after we fork, but
901 on BSD4.3 systems using vfork, that can affect the
902 GDB process as well as the inferior (the signal handling tables
903 might be in memory, shared between the two). Since we establish
904 a handler for SIGQUIT, when we call exec it will set the signal
905 to SIG_DFL for us. */
906 signal (SIGQUIT, handle_sigquit);
908 create_async_signal_handler (async_do_nothing, NULL);
910 if (signal (SIGHUP, handle_sighup) != SIG_IGN)
912 create_async_signal_handler (async_disconnect, NULL);
915 create_async_signal_handler (async_do_nothing, NULL);
917 signal (SIGFPE, handle_sigfpe);
919 create_async_signal_handler (async_float_handler, NULL);
921 #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER)
922 signal (SIGWINCH, handle_sigwinch);
924 create_async_signal_handler (SIGWINCH_HANDLER, NULL);
928 create_async_signal_handler (async_stop_sig, NULL);
934 mark_async_signal_handler_wrapper (void *token)
936 mark_async_signal_handler ((struct async_signal_handler *) token);
939 /* Tell the event loop what to do if SIGINT is received.
940 See event-signal.c. */
942 handle_sigint (int sig)
944 signal (sig, handle_sigint);
946 /* If immediate_quit is set, we go ahead and process the SIGINT right
947 away, even if we usually would defer this to the event loop. The
948 assumption here is that it is safe to process ^C immediately if
949 immediate_quit is set. If we didn't, SIGINT would be really
950 processed only the next time through the event loop. To get to
951 that point, though, the command that we want to interrupt needs to
952 finish first, which is unacceptable. */
954 async_request_quit (0);
956 /* If immediate quit is not set, we process SIGINT the next time
957 through the loop, which is fine. */
958 mark_async_signal_handler_wrapper (sigint_token);
961 /* Do the quit. All the checks have been done by the caller. */
963 async_request_quit (gdb_client_data arg)
969 /* Tell the event loop what to do if SIGQUIT is received.
970 See event-signal.c. */
972 handle_sigquit (int sig)
974 mark_async_signal_handler_wrapper (sigquit_token);
975 signal (sig, handle_sigquit);
978 /* Called by the event loop in response to a SIGQUIT. */
980 async_do_nothing (gdb_client_data arg)
982 /* Empty function body. */
986 /* Tell the event loop what to do if SIGHUP is received.
987 See event-signal.c. */
989 handle_sighup (int sig)
991 mark_async_signal_handler_wrapper (sighup_token);
992 signal (sig, handle_sighup);
995 /* Called by the event loop to process a SIGHUP */
997 async_disconnect (gdb_client_data arg)
999 catch_errors (quit_cover, NULL,
1000 "Could not kill the program being debugged",
1002 signal (SIGHUP, SIG_DFL); /*FIXME: ??????????? */
1003 kill (getpid (), SIGHUP);
1009 handle_stop_sig (int sig)
1011 mark_async_signal_handler_wrapper (sigtstp_token);
1012 signal (sig, handle_stop_sig);
1016 async_stop_sig (gdb_client_data arg)
1018 char *prompt = get_prompt ();
1019 #if STOP_SIGNAL == SIGTSTP
1020 signal (SIGTSTP, SIG_DFL);
1021 #if HAVE_SIGPROCMASK
1025 sigemptyset (&zero);
1026 sigprocmask (SIG_SETMASK, &zero, 0);
1028 #elif HAVE_SIGSETMASK
1031 kill (getpid (), SIGTSTP);
1032 signal (SIGTSTP, handle_stop_sig);
1034 signal (STOP_SIGNAL, handle_stop_sig);
1036 printf_unfiltered ("%s", prompt);
1037 gdb_flush (gdb_stdout);
1039 /* Forget about any previous command -- null line now will do nothing. */
1042 #endif /* STOP_SIGNAL */
1044 /* Tell the event loop what to do if SIGFPE is received.
1045 See event-signal.c. */
1047 handle_sigfpe (int sig)
1049 mark_async_signal_handler_wrapper (sigfpe_token);
1050 signal (sig, handle_sigfpe);
1053 /* Event loop will call this functin to process a SIGFPE. */
1055 async_float_handler (gdb_client_data arg)
1057 /* This message is based on ANSI C, section 4.7. Note that integer
1058 divide by zero causes this, so "float" is a misnomer. */
1059 error (_("Erroneous arithmetic operation."));
1062 /* Tell the event loop what to do if SIGWINCH is received.
1063 See event-signal.c. */
1064 #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER)
1066 handle_sigwinch (int sig)
1068 mark_async_signal_handler_wrapper (sigwinch_token);
1069 signal (sig, handle_sigwinch);
1074 /* Called by do_setshow_command. */
1076 set_async_editing_command (char *args, int from_tty, struct cmd_list_element *c)
1078 change_line_handler ();
1081 /* Called by do_setshow_command. */
1083 set_async_annotation_level (char *args, int from_tty, struct cmd_list_element *c)
1085 change_annotation_level ();
1088 /* Called by do_setshow_command. */
1090 set_async_prompt (char *args, int from_tty, struct cmd_list_element *c)
1092 PROMPT (0) = savestring (new_async_prompt, strlen (new_async_prompt));
1095 /* Set things up for readline to be invoked via the alternate
1096 interface, i.e. via a callback function (rl_callback_read_char),
1097 and hook up instream to the event loop. */
1099 gdb_setup_readline (void)
1101 /* This function is a noop for the sync case. The assumption is
1102 that the sync setup is ALL done in gdb_init, and we would only
1103 mess it up here. The sync stuff should really go away over
1106 gdb_stdout = stdio_fileopen (stdout);
1107 gdb_stderr = stdio_fileopen (stderr);
1108 gdb_stdlog = gdb_stderr; /* for moment */
1109 gdb_stdtarg = gdb_stderr; /* for moment */
1111 /* If the input stream is connected to a terminal, turn on
1113 if (ISATTY (instream))
1115 /* Tell gdb that we will be using the readline library. This
1116 could be overwritten by a command in .gdbinit like 'set
1117 editing on' or 'off'. */
1118 async_command_editing_p = 1;
1120 /* When a character is detected on instream by select or poll,
1121 readline will be invoked via this callback function. */
1122 call_readline = rl_callback_read_char_wrapper;
1126 async_command_editing_p = 0;
1127 call_readline = gdb_readline2;
1130 /* When readline has read an end-of-line character, it passes the
1131 complete line to gdb for processing. command_line_handler is the
1132 function that does this. */
1133 input_handler = command_line_handler;
1135 /* Tell readline to use the same input stream that gdb uses. */
1136 rl_instream = instream;
1138 /* Get a file descriptor for the input stream, so that we can
1139 register it with the event loop. */
1140 input_fd = fileno (instream);
1142 /* Now we need to create the event sources for the input file
1144 /* At this point in time, this is the only event source that we
1145 register with the even loop. Another source is going to be the
1146 target program (inferior), but that must be registered only when
1147 it actually exists (I.e. after we say 'run' or after we connect
1148 to a remote target. */
1149 add_file_handler (input_fd, stdin_event_handler, 0);
1152 /* Disable command input through the standard CLI channels. Used in
1153 the suspend proc for interpreters that use the standard gdb readline
1154 interface, like the cli & the mi. */
1156 gdb_disable_readline (void)
1158 /* FIXME - It is too heavyweight to delete and remake these every
1159 time you run an interpreter that needs readline. It is probably
1160 better to have the interpreters cache these, which in turn means
1161 that this needs to be moved into interpreter specific code. */
1164 ui_file_delete (gdb_stdout);
1165 ui_file_delete (gdb_stderr);
1170 rl_callback_handler_remove ();
1171 delete_file_handler (input_fd);