1 /* Top level stuff for GDB, the GNU debugger.
2 Copyright 1999 Free Software Foundation, Inc.
3 Written by Elena Zannoni <ezannoni@cygnus.com> of Cygnus Solutions.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
26 #include "terminal.h" /* for job_control */
28 #include "event-loop.h"
29 #include "event-top.h"
31 /* For dont_repeat() */
34 /* readline include files */
35 #include <readline/readline.h>
36 #include <readline/history.h>
40 /* readline defines this. */
43 extern void _initialize_event_loop (void);
45 static void rl_callback_read_char_wrapper (gdb_client_data client_data);
46 static void command_line_handler (char *rl);
47 static void command_line_handler_continuation (struct continuation_arg *arg);
48 static void change_line_handler (void);
49 static void change_annotation_level (void);
50 static void command_handler (char *command);
51 void cli_command_loop (void);
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;
160 /* Wrapper function foe calling into the readline library. The event
161 loop expects the callback function to have a paramter, while readline
164 rl_callback_read_char_wrapper (gdb_client_data client_data)
166 rl_callback_read_char ();
169 /* Initialize all the necessary variables, start the event loop,
170 register readline, and stdin, start the loop. */
172 cli_command_loop (void)
176 char *gdb_prompt = get_prompt ();
178 /* If we are using readline, set things up and display the first
179 prompt, otherwise just print the prompt. */
180 if (async_command_editing_p)
182 /* Tell readline what the prompt to display is and what function it
183 will need to call after a whole line is read. This also displays
185 length = strlen (PREFIX (0)) + strlen (gdb_prompt) + strlen (SUFFIX (0)) + 1;
186 a_prompt = (char *) xmalloc (length);
187 strcpy (a_prompt, PREFIX (0));
188 strcat (a_prompt, gdb_prompt);
189 strcat (a_prompt, SUFFIX (0));
190 rl_callback_handler_install (a_prompt, input_handler);
193 display_gdb_prompt (0);
195 /* Now it's time to start the event loop. */
199 /* Change the function to be invoked every time there is a character
200 ready on stdin. This is used when the user sets the editing off,
201 therefore bypassing readline, and letting gdb handle the input
202 itself, via gdb_readline2. Also it is used in the opposite case in
203 which the user sets editing on again, by restoring readline
204 handling of the input. */
206 change_line_handler (void)
208 /* NOTE: this operates on input_fd, not instream. If we are reading
209 commands from a file, instream will point to the file. However in
210 async mode, we always read commands from a file with editing
211 off. This means that the 'set editing on/off' will have effect
212 only on the interactive session. */
214 if (async_command_editing_p)
216 /* Turn on editing by using readline. */
217 call_readline = rl_callback_read_char_wrapper;
218 input_handler = command_line_handler;
222 /* Turn off editing by using gdb_readline2. */
223 rl_callback_handler_remove ();
224 call_readline = gdb_readline2;
226 /* Set up the command handler as well, in case we are called as
227 first thing from .gdbinit. */
228 input_handler = command_line_handler;
232 /* Displays the prompt. The prompt that is displayed is the current
233 top of the prompt stack, if the argument NEW_PROMPT is
234 0. Otherwise, it displays whatever NEW_PROMPT is. This is used
235 after each gdb command has completed, and in the following cases:
236 1. when the user enters a command line which is ended by '\'
237 indicating that the command will continue on the next line.
238 In that case the prompt that is displayed is the empty string.
239 2. When the user is entering 'commands' for a breakpoint, or
240 actions for a tracepoint. In this case the prompt will be '>'
242 FIXME: 2. & 3. not implemented yet for async. */
244 display_gdb_prompt (char *new_prompt)
246 int prompt_length = 0;
247 char *gdb_prompt = get_prompt ();
250 /* When an alternative interpreter has been installed, do not
251 display the comand prompt. */
256 if (target_executing && sync_execution)
258 /* This is to trick readline into not trying to display the
259 prompt. Even though we display the prompt using this
260 function, readline still tries to do its own display if we
261 don't call rl_callback_handler_install and
262 rl_callback_handler_remove (which readline detects because a
263 global variable is not set). If readline did that, it could
264 mess up gdb signal handlers for SIGINT. Readline assumes
265 that between calls to rl_set_signals and rl_clear_signals gdb
266 doesn't do anything with the signal handlers. Well, that's
267 not the case, because when the target executes we change the
268 SIGINT signal handler. If we allowed readline to display the
269 prompt, the signal handler change would happen exactly
270 between the calls to the above two functions.
271 Calling rl_callback_handler_remove(), does the job. */
273 rl_callback_handler_remove ();
279 /* Just use the top of the prompt stack. */
280 prompt_length = strlen (PREFIX (0)) +
281 strlen (SUFFIX (0)) +
282 strlen (gdb_prompt) + 1;
284 new_prompt = (char *) alloca (prompt_length);
286 /* Prefix needs to have new line at end. */
287 strcpy (new_prompt, PREFIX (0));
288 strcat (new_prompt, gdb_prompt);
289 /* Suffix needs to have a new line at end and \032 \032 at
291 strcat (new_prompt, SUFFIX (0));
294 if (async_command_editing_p)
296 rl_callback_handler_remove ();
297 rl_callback_handler_install (new_prompt, input_handler);
299 /* new_prompt at this point can be the top of the stack or the one passed in */
302 /* Don't use a _filtered function here. It causes the assumed
303 character position to be off, since the newline we read from
304 the user is not accounted for. */
305 fputs_unfiltered (new_prompt, gdb_stdout);
308 /* Move to a new line so the entered line doesn't have a prompt
309 on the front of it. */
310 fputs_unfiltered ("\n", gdb_stdout);
312 gdb_flush (gdb_stdout);
316 /* Used when the user requests a different annotation level, with
317 'set annotate'. It pushes a new prompt (with prefix and suffix) on top
318 of the prompt stack, if the annotation level desired is 2, otherwise
319 it pops the top of the prompt stack when we want the annotation level
320 to be the normal ones (1 or 0). */
322 change_annotation_level (void)
324 char *prefix, *suffix;
326 if (!PREFIX (0) || !PROMPT (0) || !SUFFIX (0))
328 /* The prompt stack has not been initialized to "", we are
329 using gdb w/o the --async switch */
330 warning ("Command has same effect as set annotate");
334 if (annotation_level > 1)
336 if (!strcmp (PREFIX (0), "") && !strcmp (SUFFIX (0), ""))
338 /* Push a new prompt if the previous annotation_level was not >1. */
339 prefix = (char *) alloca (strlen (async_annotation_suffix) + 10);
340 strcpy (prefix, "\n\032\032pre-");
341 strcat (prefix, async_annotation_suffix);
342 strcat (prefix, "\n");
344 suffix = (char *) alloca (strlen (async_annotation_suffix) + 6);
345 strcpy (suffix, "\n\032\032");
346 strcat (suffix, async_annotation_suffix);
347 strcat (suffix, "\n");
349 push_prompt (prefix, (char *) 0, suffix);
354 if (strcmp (PREFIX (0), "") && strcmp (SUFFIX (0), ""))
356 /* Pop the top of the stack, we are going back to annotation < 1. */
362 /* Pushes a new prompt on the prompt stack. Each prompt has three
363 parts: prefix, prompt, suffix. Usually prefix and suffix are empty
364 strings, except when the annotation level is 2. Memory is allocated
365 within savestring for the new prompt. */
367 push_prompt (char *prefix, char *prompt, char *suffix)
370 PREFIX (0) = savestring (prefix, strlen (prefix));
372 /* Note that this function is used by the set annotate 2
373 command. This is why we take care of saving the old prompt
374 in case a new one is not specified. */
376 PROMPT (0) = savestring (prompt, strlen (prompt));
378 PROMPT (0) = savestring (PROMPT (-1), strlen (PROMPT (-1)));
380 SUFFIX (0) = savestring (suffix, strlen (suffix));
383 /* Pops the top of the prompt stack, and frees the memory allocated for it. */
387 /* If we are not during a 'synchronous' execution command, in which
388 case, the top prompt would be empty. */
389 if (strcmp (PROMPT (0), ""))
390 /* This is for the case in which the prompt is set while the
391 annotation level is 2. The top prompt will be changed, but when
392 we return to annotation level < 2, we want that new prompt to be
393 in effect, until the user does another 'set prompt'. */
394 if (strcmp (PROMPT (0), PROMPT (-1)))
397 PROMPT (-1) = savestring (PROMPT (0), strlen (PROMPT (0)));
406 /* When there is an event ready on the stdin file desriptor, instead
407 of calling readline directly throught the callback function, or
408 instead of calling gdb_readline2, give gdb a chance to detect
409 errors and do something. */
411 stdin_event_handler (int error, gdb_client_data client_data)
415 printf_unfiltered ("error detected on stdin\n");
416 delete_file_handler (input_fd);
417 discard_all_continuations ();
418 /* If stdin died, we may as well kill gdb. */
419 quit_command ((char *) 0, stdin == instream);
422 (*call_readline) (client_data);
425 /* Re-enable stdin after the end of an execution command in
426 synchronous mode, or after an error from the target, and we aborted
427 the exec operation. */
430 async_enable_stdin (void *dummy)
432 /* See NOTE in async_disable_stdin() */
433 /* FIXME: cagney/1999-09-27: Call this before clearing
434 sync_execution. Current target_terminal_ours() implementations
435 check for sync_execution before switching the terminal. */
436 target_terminal_ours ();
441 /* Disable reads from stdin (the console) marking the command as
445 async_disable_stdin (void)
448 push_prompt ("", "", "");
449 /* FIXME: cagney/1999-09-27: At present this call is technically
450 redundant since infcmd.c and infrun.c both already call
451 target_terminal_inferior(). As the terminal handling (in
452 sync/async mode) is refined, the duplicate calls can be
453 eliminated (Here or in infcmd.c/infrun.c). */
454 target_terminal_inferior ();
455 /* Add the reinstate of stdin to the list of cleanups to be done
456 in case the target errors out and dies. These cleanups are also
457 done in case of normal successful termination of the execution
458 command, by complete_execution(). */
459 make_exec_error_cleanup (async_enable_stdin, NULL);
463 /* Handles a gdb command. This function is called by
464 command_line_handler, which has processed one or more input lines
466 /* NOTE: 1999-04-30 This is the asynchronous version of the command_loop
467 function. The command_loop function will be obsolete when we
468 switch to use the event loop at every execution of gdb. */
470 command_handler (char *command)
472 struct cleanup *old_chain;
473 int stdin_is_tty = ISATTY (stdin);
474 struct continuation_arg *arg1;
475 struct continuation_arg *arg2;
476 long time_at_cmd_start;
478 long space_at_cmd_start = 0;
480 extern int display_time;
481 extern int display_space;
484 extern int insert_mode;
488 if (instream == stdin && stdin_is_tty)
489 reinitialize_more_filter ();
490 old_chain = make_cleanup (command_loop_marker, 0);
495 /* If readline returned a NULL command, it means that the
496 connection with the terminal is gone. This happens at the
497 end of a testsuite run, after Expect has hung up
498 but GDB is still alive. In such a case, we just quit gdb
499 killing the inferior program too. */
501 quit_command ((char *) 0, stdin == instream);
503 time_at_cmd_start = get_run_time ();
508 extern char **environ;
509 char *lim = (char *) sbrk (0);
511 space_at_cmd_start = (long) (lim - (char *) &environ);
515 execute_command (command, instream == stdin);
517 /* Set things up for this function to be compete later, once the
518 executin has completed, if we are doing an execution command,
519 otherwise, just go ahead and finish. */
520 if (target_can_async_p () && target_executing)
523 (struct continuation_arg *) xmalloc (sizeof (struct continuation_arg));
525 (struct continuation_arg *) xmalloc (sizeof (struct continuation_arg));
528 arg1->data.integer = time_at_cmd_start;
529 arg2->data.integer = space_at_cmd_start;
530 add_continuation (command_line_handler_continuation, arg1);
533 /* Do any commands attached to breakpoint we stopped at. Only if we
534 are always running synchronously. Or if we have just executed a
535 command that doesn't start the target. */
536 if (!target_can_async_p () || !target_executing)
538 bpstat_do_actions (&stop_bpstat);
539 do_cleanups (old_chain);
543 long cmd_time = get_run_time () - time_at_cmd_start;
545 printf_unfiltered ("Command execution time: %ld.%06ld\n",
546 cmd_time / 1000000, cmd_time % 1000000);
552 extern char **environ;
553 char *lim = (char *) sbrk (0);
554 long space_now = lim - (char *) &environ;
555 long space_diff = space_now - space_at_cmd_start;
557 printf_unfiltered ("Space used: %ld (%c%ld for this command)\n",
559 (space_diff >= 0 ? '+' : '-'),
566 /* Do any commands attached to breakpoint we stopped at. Only if we
567 are always running synchronously. Or if we have just executed a
568 command that doesn't start the target. */
570 command_line_handler_continuation (struct continuation_arg *arg)
572 extern int display_time;
573 extern int display_space;
575 long time_at_cmd_start = arg->data.longint;
576 long space_at_cmd_start = arg->next->data.longint;
578 bpstat_do_actions (&stop_bpstat);
579 /*do_cleanups (old_chain); *//*?????FIXME????? */
583 long cmd_time = get_run_time () - time_at_cmd_start;
585 printf_unfiltered ("Command execution time: %ld.%06ld\n",
586 cmd_time / 1000000, cmd_time % 1000000);
591 extern char **environ;
592 char *lim = (char *) sbrk (0);
593 long space_now = lim - (char *) &environ;
594 long space_diff = space_now - space_at_cmd_start;
596 printf_unfiltered ("Space used: %ld (%c%ld for this command)\n",
598 (space_diff >= 0 ? '+' : '-'),
604 /* Handle a complete line of input. This is called by the callback
605 mechanism within the readline library. Deal with incomplete commands
606 as well, by saving the partial input in a global buffer. */
608 /* NOTE: 1999-04-30 This is the asynchronous version of the
609 command_line_input function. command_line_input will become
610 obsolete once we use the event loop as the default mechanism in
613 command_line_handler (char *rl)
615 static char *linebuffer = 0;
616 static unsigned linelength = 0;
625 int repeat = (instream == stdin);
627 if (annotation_level > 1 && instream == stdin)
629 printf_unfiltered ("\n\032\032post-");
630 printf_unfiltered (async_annotation_suffix);
631 printf_unfiltered ("\n");
637 linebuffer = (char *) xmalloc (linelength);
644 strcpy (linebuffer, readline_input_state.linebuffer);
645 p = readline_input_state.linebuffer_ptr;
646 free (readline_input_state.linebuffer);
653 signal (STOP_SIGNAL, handle_stop_sig);
656 /* Make sure that all output has been output. Some machines may let
657 you get away with leaving out some of the gdb_flush, but not all. */
659 gdb_flush (gdb_stdout);
660 gdb_flush (gdb_stderr);
662 if (source_file_name != NULL)
664 ++source_line_number;
665 sprintf (source_error,
666 "%s%s:%d: Error in sourced command file:\n",
670 error_pre_print = source_error;
673 /* If we are in this case, then command_handler will call quit
674 and exit from gdb. */
675 if (!rl || rl == (char *) EOF)
680 if (strlen (rl) + 1 + (p - linebuffer) > linelength)
682 linelength = strlen (rl) + 1 + (p - linebuffer);
683 nline = (char *) xrealloc (linebuffer, linelength);
684 p += nline - linebuffer;
688 /* Copy line. Don't copy null at end. (Leaves line alone
689 if this was just a newline) */
693 free (rl); /* Allocated in readline. */
695 if (*(p - 1) == '\\')
697 p--; /* Put on top of '\'. */
701 readline_input_state.linebuffer = savestring (linebuffer,
702 strlen (linebuffer));
703 readline_input_state.linebuffer_ptr = p;
705 /* We will not invoke a execute_command if there is more
706 input expected to complete the command. So, we need to
707 print an empty prompt here. */
709 push_prompt ("", "", "");
710 display_gdb_prompt (0);
717 signal (STOP_SIGNAL, SIG_DFL);
720 #define SERVER_COMMAND_LENGTH 7
722 (p - linebuffer > SERVER_COMMAND_LENGTH)
723 && STREQN (linebuffer, "server ", SERVER_COMMAND_LENGTH);
726 /* Note that we don't set `line'. Between this and the check in
727 dont_repeat, this insures that repeating will still do the
730 command_handler (linebuffer + SERVER_COMMAND_LENGTH);
731 display_gdb_prompt (0);
735 /* Do history expansion if that is wished. */
736 if (history_expansion_p && instream == stdin
737 && ISATTY (instream))
742 *p = '\0'; /* Insert null now. */
743 expanded = history_expand (linebuffer, &history_value);
746 /* Print the changes. */
747 printf_unfiltered ("%s\n", history_value);
749 /* If there was an error, call this function again. */
752 free (history_value);
755 if (strlen (history_value) > linelength)
757 linelength = strlen (history_value) + 1;
758 linebuffer = (char *) xrealloc (linebuffer, linelength);
760 strcpy (linebuffer, history_value);
761 p = linebuffer + strlen (linebuffer);
762 free (history_value);
766 /* If we just got an empty line, and that is supposed
767 to repeat the previous command, return the value in the
769 if (repeat && p == linebuffer && *p != '\\')
771 command_handler (line);
772 display_gdb_prompt (0);
776 for (p1 = linebuffer; *p1 == ' ' || *p1 == '\t'; p1++);
779 command_handler (line);
780 display_gdb_prompt (0);
786 /* Add line to history if appropriate. */
787 if (instream == stdin
788 && ISATTY (stdin) && *linebuffer)
789 add_history (linebuffer);
791 /* Note: lines consisting solely of comments are added to the command
792 history. This is useful when you type a command, and then
793 realize you don't want to execute it quite yet. You can comment
794 out the command and then later fetch it from the value history
795 and remove the '#'. The kill ring is probably better, but some
796 people are in the habit of commenting things out. */
798 *p1 = '\0'; /* Found a comment. */
800 /* Save into global buffer if appropriate. */
803 if (linelength > linesize)
805 line = xrealloc (line, linelength);
806 linesize = linelength;
808 strcpy (line, linebuffer);
811 command_handler (line);
812 display_gdb_prompt (0);
817 command_handler (linebuffer);
818 display_gdb_prompt (0);
822 /* Does reading of input from terminal w/o the editing features
823 provided by the readline library. */
825 /* NOTE: 1999-04-30 Asynchronous version of gdb_readline. gdb_readline
826 will become obsolete when the event loop is made the default
827 execution for gdb. */
829 gdb_readline2 (gdb_client_data client_data)
834 int result_size = 80;
835 static int done_once = 0;
837 /* Unbuffer the input stream, so that, later on, the calls to fgetc
838 fetch only one char at the time from the stream. The fgetc's will
839 get up to the first newline, but there may be more chars in the
840 stream after '\n'. If we buffer the input and fgetc drains the
841 stream, getting stuff beyond the newline as well, a select, done
842 afterwards will not trigger. */
843 if (!done_once && !ISATTY (instream))
845 setbuf (instream, NULL);
849 result = (char *) xmalloc (result_size);
851 /* We still need the while loop here, even though it would seem
852 obvious to invoke gdb_readline2 at every character entered. If
853 not using the readline library, the terminal is in cooked mode,
854 which sends the characters all at once. Poll will notice that the
855 input fd has changed state only after enter is pressed. At this
856 point we still need to fetch all the chars entered. */
860 /* Read from stdin if we are executing a user defined command.
861 This is the right thing for prompt_for_continue, at least. */
862 c = fgetc (instream ? instream : stdin);
867 /* The last line does not end with a newline. Return it, and
868 if we are called again fgetc will still return EOF and
869 we'll return NULL then. */
872 (*input_handler) (0);
876 #ifndef CRLF_SOURCE_FILES
880 if (input_index > 0 && result[input_index - 1] == '\r')
886 result[input_index++] = c;
887 while (input_index >= result_size)
890 result = (char *) xrealloc (result, result_size);
894 result[input_index++] = '\0';
895 (*input_handler) (result);
899 /* Initialization of signal handlers and tokens. There is a function
900 handle_sig* for each of the signals GDB cares about. Specifically:
901 SIGINT, SIGFPE, SIGQUIT, SIGTSTP, SIGHUP, SIGWINCH. These
902 functions are the actual signal handlers associated to the signals
903 via calls to signal(). The only job for these functions is to
904 enqueue the appropriate event/procedure with the event loop. Such
905 procedures are the old signal handlers. The event loop will take
906 care of invoking the queued procedures to perform the usual tasks
907 associated with the reception of the signal. */
908 /* NOTE: 1999-04-30 This is the asynchronous version of init_signals.
909 init_signals will become obsolete as we move to have to event loop
910 as the default for gdb. */
912 async_init_signals (void)
914 signal (SIGINT, handle_sigint);
916 create_async_signal_handler (async_request_quit, NULL);
918 /* If SIGTRAP was set to SIG_IGN, then the SIG_IGN will get passed
919 to the inferior and breakpoints will be ignored. */
921 signal (SIGTRAP, SIG_DFL);
924 /* If we initialize SIGQUIT to SIG_IGN, then the SIG_IGN will get
925 passed to the inferior, which we don't want. It would be
926 possible to do a "signal (SIGQUIT, SIG_DFL)" after we fork, but
927 on BSD4.3 systems using vfork, that can affect the
928 GDB process as well as the inferior (the signal handling tables
929 might be in memory, shared between the two). Since we establish
930 a handler for SIGQUIT, when we call exec it will set the signal
931 to SIG_DFL for us. */
932 signal (SIGQUIT, handle_sigquit);
934 create_async_signal_handler (async_do_nothing, NULL);
936 if (signal (SIGHUP, handle_sighup) != SIG_IGN)
938 create_async_signal_handler (async_disconnect, NULL);
941 create_async_signal_handler (async_do_nothing, NULL);
943 signal (SIGFPE, handle_sigfpe);
945 create_async_signal_handler (async_float_handler, NULL);
947 #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER)
948 signal (SIGWINCH, handle_sigwinch);
950 create_async_signal_handler (SIGWINCH_HANDLER, NULL);
954 create_async_signal_handler (async_stop_sig, NULL);
960 mark_async_signal_handler_wrapper (void *token)
962 mark_async_signal_handler ((struct async_signal_handler *) token);
965 /* Tell the event loop what to do if SIGINT is received.
966 See event-signal.c. */
968 handle_sigint (int sig)
970 signal (sig, handle_sigint);
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 /* Do the quit. All the checks have been done by the caller. */
989 async_request_quit (gdb_client_data arg)
999 /* Tell the event loop what to do if SIGQUIT is received.
1000 See event-signal.c. */
1002 handle_sigquit (int sig)
1004 mark_async_signal_handler_wrapper (sigquit_token);
1005 signal (sig, handle_sigquit);
1008 /* Called by the event loop in response to a SIGQUIT. */
1010 async_do_nothing (gdb_client_data arg)
1012 /* Empty function body. */
1016 /* Tell the event loop what to do if SIGHUP is received.
1017 See event-signal.c. */
1022 mark_async_signal_handler_wrapper (sighup_token);
1023 signal (sig, handle_sighup);
1026 /* Called by the event loop to process a SIGHUP */
1028 async_disconnect (gdb_client_data arg)
1030 catch_errors (quit_cover, NULL,
1031 "Could not kill the program being debugged",
1033 signal (SIGHUP, SIG_DFL); /*FIXME: ??????????? */
1034 kill (getpid (), SIGHUP);
1040 handle_stop_sig (int sig)
1042 mark_async_signal_handler_wrapper (sigtstp_token);
1043 signal (sig, handle_stop_sig);
1047 async_stop_sig (gdb_client_data arg)
1049 char *prompt = get_prompt ();
1050 #if STOP_SIGNAL == SIGTSTP
1051 signal (SIGTSTP, SIG_DFL);
1052 #if HAVE_SIGPROCMASK
1055 sigemptyset (&zero);
1056 sigprocmask (SIG_SETMASK, &zero, 0);
1061 kill (getpid (), SIGTSTP);
1062 signal (SIGTSTP, handle_stop_sig);
1064 signal (STOP_SIGNAL, handle_stop_sig);
1066 printf_unfiltered ("%s", prompt);
1067 gdb_flush (gdb_stdout);
1069 /* Forget about any previous command -- null line now will do nothing. */
1072 #endif /* STOP_SIGNAL */
1074 /* Tell the event loop what to do if SIGFPE is received.
1075 See event-signal.c. */
1077 handle_sigfpe (int sig)
1079 mark_async_signal_handler_wrapper (sigfpe_token);
1080 signal (sig, handle_sigfpe);
1083 /* Event loop will call this functin to process a SIGFPE. */
1085 async_float_handler (gdb_client_data arg)
1087 /* This message is based on ANSI C, section 4.7. Note that integer
1088 divide by zero causes this, so "float" is a misnomer. */
1089 error ("Erroneous arithmetic operation.");
1092 /* Tell the event loop what to do if SIGWINCH is received.
1093 See event-signal.c. */
1094 #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER)
1096 handle_sigwinch (int sig)
1098 mark_async_signal_handler_wrapper (sigwinch_token);
1099 signal (sig, handle_sigwinch);
1104 /* Called by do_setshow_command. */
1107 set_async_editing_command (char *args, int from_tty, struct cmd_list_element *c)
1109 change_line_handler ();
1112 /* Called by do_setshow_command. */
1115 set_async_annotation_level (char *args, int from_tty, struct cmd_list_element *c)
1117 change_annotation_level ();
1120 /* Called by do_setshow_command. */
1123 set_async_prompt (char *args, int from_tty, struct cmd_list_element *c)
1125 PROMPT (0) = savestring (new_async_prompt, strlen (new_async_prompt));
1128 /* Set things up for readline to be invoked via the alternate
1129 interface, i.e. via a callback function (rl_callback_read_char),
1130 and hook up instream to the event loop. */
1132 _initialize_event_loop (void)
1136 /* If the input stream is connected to a terminal, turn on
1138 if (ISATTY (instream))
1140 /* Tell gdb that we will be using the readline library. This
1141 could be overwritten by a command in .gdbinit like 'set
1142 editing on' or 'off'. */
1143 async_command_editing_p = 1;
1145 /* When a character is detected on instream by select or
1146 poll, readline will be invoked via this callback
1148 call_readline = rl_callback_read_char_wrapper;
1152 async_command_editing_p = 0;
1153 call_readline = gdb_readline2;
1156 /* When readline has read an end-of-line character, it passes
1157 the complete line to gdb for processing. command_line_handler
1158 is the function that does this. */
1159 input_handler = command_line_handler;
1161 /* Tell readline to use the same input stream that gdb uses. */
1162 rl_instream = instream;
1164 /* Get a file descriptor for the input stream, so that we can
1165 register it with the event loop. */
1166 input_fd = fileno (instream);
1168 /* Tell gdb to use the cli_command_loop as the main loop. */
1169 command_loop_hook = cli_command_loop;
1171 /* Now we need to create the event sources for the input file
1173 /* At this point in time, this is the only event source that we
1174 register with the even loop. Another source is going to be
1175 the target program (inferior), but that must be registered
1176 only when it actually exists (I.e. after we say 'run' or
1177 after we connect to a remote target. */
1178 add_file_handler (input_fd, stdin_event_handler, 0);