954 lines
28 KiB
C
954 lines
28 KiB
C
/* Top level stuff for GDB, the GNU debugger.
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Copyright 1999 Free Software Foundation, Inc.
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Written by Elena Zannoni <ezannoni@cygnus.com> of Cygnus Solutions.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#include "defs.h"
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#include "event-loop.h"
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#ifdef HAVE_POLL
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#include <sys/poll.h>
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#endif
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#include "inferior.h"
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/* readline include files */
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#include <readline/readline.h>
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#include <readline/history.h>
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/* readline defines this. */
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#undef savestring
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extern FILE *instream;
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static void command_line_handler PARAMS ((char *));
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static void gdb_readline2 PARAMS ((void));
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static void pop_prompt PARAMS ((void));
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static void push_prompt PARAMS ((char *, char *, char *));
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static void change_line_handler PARAMS ((void));
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static void change_annotation_level PARAMS ((void));
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static void command_handler PARAMS ((char *));
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/* Signal handlers. */
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void handle_sigint PARAMS ((int));
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void handle_sigquit PARAMS ((int));
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void handle_sighup PARAMS ((int));
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void handle_sigfpe PARAMS ((int));
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void handle_sigwinch PARAMS ((int));
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/* Functions to be invoked by the event loop in response to
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signals. */
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void async_request_quit PARAMS ((void));
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void async_do_nothing PARAMS ((void));
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void async_disconnect PARAMS ((void));
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void async_float_handler PARAMS ((void));
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/* Functions from top.c. */
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extern void command_loop_marker PARAMS ((int));
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extern int quit_cover PARAMS ((PTR));
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extern void quit_command PARAMS ((char *, int));
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extern void execute_command PARAMS ((char *, int));
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/* Variables from top.c. */
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extern int source_line_number;
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extern char *source_file_name;
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extern char *source_error;
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extern char *source_pre_error;
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extern int history_expansion_p;
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extern int server_command;
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/* If this definition isn't overridden by the header files, assume
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that isatty and fileno exist on this system. */
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#ifndef ISATTY
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#define ISATTY(FP) (isatty (fileno (FP)))
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#endif
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/* Hook for alternate command interface. */
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void (*async_hook) PARAMS ((void));
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/* Readline offers an alternate interface, via callback
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functions. These are all included in the file callback.c in the
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readline distribution. This file provides (mainly) a function, which
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the event loop uses as callback (i.e. event handler) whenever an event
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is detected on the standard input file descriptor.
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readline_callback_read_char is called (by the GDB event loop) whenever
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there is a new character ready on the input stream. This function
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incrementally builds a buffer internal to readline where it
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accumulates the line read up to the point of invocation. In the
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special case in which the character read is newline, the function
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invokes a GDB supplied callback routine, which does the processing of
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a full command line. This latter routine is the asynchronous analog
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of the old command_line_input in gdb. Instead of invoking (and waiting
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for) readline to read the command line and pass it back to
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command_loop for processing, the new command_line_handler function has
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the command line already available as its parameter. INPUT_HANDLER is
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to be set to the function that readline will invoke when a complete
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line of input is ready. CALL_READLINE is to be set to the function
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that readline offers as callback to the event_loop. */
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void (*input_handler) PARAMS ((char *));
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void (*call_readline) PARAMS ((void));
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/* Important variables for the event loop. */
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/* This is used to determine if GDB is using the readline library or
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its own simplified form of readline. It is used by the asynchronous
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form of the set editing command.
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ezannoni: as of 1999-04-29 I expect that this
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variable will not be used after gdb is changed to use the event
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loop as default engine, and event-top.c is merged into top.c. */
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int async_command_editing_p;
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/* This variable contains the new prompt that the user sets with the
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set prompt command. */
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char *new_async_prompt;
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/* This is the annotation suffix that will be used when the
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annotation_level is 2. */
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char *async_annotation_suffix;
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/* This is the file descriptor for the input stream that GDB uses to
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read commands from. */
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int input_fd;
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/* This is the prompt stack. Prompts will be pushed on the stack as
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needed by the different 'kinds' of user inputs GDB is asking
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for. See event-loop.h. */
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struct prompts the_prompts;
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/* signal handling variables */
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/* Each of these is a pointer to a function that the event loop will
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invoke if the corresponding signal has received. The real signal
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handlers mark these functions as ready to be executed and the event
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loop, in a later iteration, calls them. See the function
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invoke_async_signal_handler. */
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async_signal_handler *sigint_token;
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#ifdef SIGHUP
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async_signal_handler *sighup_token;
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#endif
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async_signal_handler *sigquit_token;
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async_signal_handler *sigfpe_token;
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#if defined(SIGWINCH) && defined(SIGWINCH_HANDLER)
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async_signal_handler *sigwinch_token;
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#endif
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/* Structure to save a partially entered command. This is used when
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the user types '\' at the end of a command line. This is necessary
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because each line of input is handled by a different call to
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command_line_handler, and normally there is no state retained
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between different calls. */
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int more_to_come = 0;
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struct readline_input_state
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{
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char *linebuffer;
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char *linebuffer_ptr;
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}
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readline_input_state;
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/* Initialize all the necessary variables, start the event loop,
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register readline, and stdin. */
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void
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setup_event_loop ()
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{
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int length = strlen (PREFIX (0)) + strlen (PROMPT (0)) + strlen (SUFFIX (0)) + 1;
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char *a_prompt = (char *) xmalloc (length);
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/* Set things up for readline to be invoked via the alternate
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interface, i.e. via a callback function (rl_callback_read_char). */
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call_readline = rl_callback_read_char;
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/* When readline has read an end-of-line character, it passes the
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complete line to gdb for processing. command_line_handler is the
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function that does this. */
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input_handler = command_line_handler;
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/* Tell readline what the prompt to display is and what function it
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will need to call after a whole line is read. */
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strcpy (a_prompt, PREFIX (0));
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strcat (a_prompt, PROMPT (0));
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strcat (a_prompt, SUFFIX (0));
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rl_callback_handler_install (a_prompt, input_handler);
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/* Tell readline to use the same input stream that gdb uses. */
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rl_instream = instream;
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/* Get a file descriptor for the input stream, so that we can
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register it with the event loop. */
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input_fd = fileno (instream);
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/* Now we need to create the event sources for the input file descriptor. */
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/* At this point in time, this is the only event source that we
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register with the even loop. Another source is going to be the
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target program (inferior), but that must be registered only when
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it actually exists (I.e. after we say 'run' or after we connect
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to a remote target. */
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#ifdef HAVE_POLL
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create_file_handler (input_fd, POLLIN,
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(file_handler_func *) call_readline, 0);
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#else
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create_file_handler (input_fd, GDB_READABLE,
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(file_handler_func *) call_readline, 0);
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#endif
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/* Loop until there is something to do. This is the entry point to
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the event loop engine. gdb_do_one_event will process one event
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for each invocation. It always returns 1, unless there are no
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more event sources registered. In this case it returns 0. */
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while (gdb_do_one_event () != 0)
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;
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/* We are done with the event loop. There are no more event sources
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to listen to. So we exit GDB. */
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return;
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}
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/* Change the function to be invoked every time there is a character
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ready on stdin. This is used when the user sets the editing off,
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therefore bypassing readline, and letting gdb handle the input
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itself, via gdb_readline2. Also it is used in the opposite case in
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which the user sets editing on again, by restoring readline
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handling of the input. */
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static void
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change_line_handler ()
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{
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if (async_command_editing_p)
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{
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/* Turn on editing by using readline. */
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call_readline = rl_callback_read_char;
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}
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else
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{
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/* Turn off editing by using gdb_readline2. */
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rl_callback_handler_remove ();
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call_readline = gdb_readline2;
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}
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/* To tell the event loop to change the handler associated with the
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input file descriptor, we need to create a new event source,
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corresponding to the same fd, but with a new event handler
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function. */
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delete_file_handler (input_fd);
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#ifdef HAVE_POLL
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create_file_handler (input_fd, POLLIN,
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(file_handler_func *) call_readline, 0);
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#else
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create_file_handler (input_fd, GDB_READABLE,
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(file_handler_func *) call_readline, 0);
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#endif
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}
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/* Displays the prompt. The prompt that is displayed is the current
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top of the prompt stack, if the argument NEW_PROMPT is
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0. Otherwise, it displays whatever NEW_PROMPT is. This is used
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after each gdb command has completed, and in the following cases:
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1. when the user enters a command line which is ended by '\'
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indicating that the command will continue on the next line.
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In that case the prompt that is displayed is the empty string.
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2. When the user is entering 'commands' for a breakpoint, or
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actions for a tracepoint. In this case the prompt will be '>'
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3. Other????
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FIXME: 2. & 3. not implemented yet for async. */
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void
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display_gdb_prompt (new_prompt)
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char *new_prompt;
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{
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int prompt_length = 0;
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if (!new_prompt)
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{
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/* Just use the top of the prompt stack. */
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prompt_length = strlen (PREFIX (0)) +
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strlen (SUFFIX (0)) +
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strlen (PROMPT (0)) + 1;
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new_prompt = (char *) alloca (prompt_length);
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/* Prefix needs to have new line at end. */
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strcpy (new_prompt, PREFIX (0));
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strcat (new_prompt, PROMPT (0));
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/* Suffix needs to have a new line at end and \032 \032 at
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beginning. */
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strcat (new_prompt, SUFFIX (0));
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}
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if (async_command_editing_p)
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{
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rl_callback_handler_remove ();
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rl_callback_handler_install (new_prompt, input_handler);
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}
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else if (new_prompt)
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{
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/* Don't use a _filtered function here. It causes the assumed
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character position to be off, since the newline we read from
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the user is not accounted for. */
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fputs_unfiltered (new_prompt, gdb_stdout);
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#ifdef MPW
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/* Move to a new line so the entered line doesn't have a prompt
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on the front of it. */
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fputs_unfiltered ("\n", gdb_stdout);
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#endif /* MPW */
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gdb_flush (gdb_stdout);
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}
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}
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/* Used when the user requests a different annotation level, with
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'set annotate'. It pushes a new prompt (with prefix and suffix) on top
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of the prompt stack, if the annotation level desired is 2, otherwise
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it pops the top of the prompt stack when we want the annotation level
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to be the normal ones (1 or 2). */
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static void
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change_annotation_level ()
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{
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char *prefix, *suffix;
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if (!PREFIX (0) || !PROMPT (0) || !SUFFIX (0))
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{
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/* The prompt stack has not been initialized to "", we are
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using gdb w/o the --async switch */
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warning ("Command has same effect as set annotate");
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return;
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}
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if (annotation_level > 1)
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{
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if (!strcmp (PREFIX (0), "") && !strcmp (SUFFIX (0), ""))
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{
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/* Push a new prompt if the previous annotation_level was not >1. */
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prefix = (char *) alloca (strlen (async_annotation_suffix) + 10);
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strcpy (prefix, "\n\032\032pre-");
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strcat (prefix, async_annotation_suffix);
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strcat (prefix, "\n");
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suffix = (char *) alloca (strlen (async_annotation_suffix) + 6);
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strcpy (suffix, "\n\032\032");
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strcat (suffix, async_annotation_suffix);
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strcat (suffix, "\n");
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push_prompt (prefix, (char *) 0, suffix);
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}
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}
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else
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{
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if (strcmp (PREFIX (0), "") && strcmp (SUFFIX (0), ""))
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{
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/* Pop the top of the stack, we are going back to annotation < 1. */
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pop_prompt ();
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}
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}
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}
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/* Pushes a new prompt on the prompt stack. Each prompt has three
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parts: prefix, prompt, suffix. Usually prefix and suffix are empty
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strings, except when the annotation level is 2. Memory is allocated
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within savestring for the new prompt. */
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static void
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push_prompt (prefix, prompt, suffix)
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char *prefix;
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char *prompt;
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char *suffix;
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{
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the_prompts.top++;
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PREFIX (0) = savestring (prefix, strlen (prefix));
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if (prompt)
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PROMPT (0) = savestring (prompt, strlen (prompt));
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else
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PROMPT (0) = savestring (PROMPT (-1), strlen (PROMPT (-1)));
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SUFFIX (0) = savestring (suffix, strlen (suffix));
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}
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/* Pops the top of the prompt stack, and frees the memory allocated for it. */
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static void
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pop_prompt ()
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{
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if (strcmp (PROMPT (0), PROMPT (-1)))
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{
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free (PROMPT (-1));
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PROMPT (-1) = savestring (PROMPT (0), strlen (PROMPT (0)));
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}
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free (PREFIX (0));
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free (PROMPT (0));
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free (SUFFIX (0));
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the_prompts.top--;
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}
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/* Handles a gdb command. This function is called by
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command_line_handler, which has processed one or more input lines
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into COMMAND. */
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/* NOTE: 1999-04-30 This is the asynchronous version of the command_loop
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function. The command_loop function will be obsolete when we
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switch to use the event loop at every execution of gdb. */
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static void
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command_handler (command)
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char *command;
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{
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struct cleanup *old_chain;
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int stdin_is_tty = ISATTY (stdin);
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long time_at_cmd_start;
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#ifdef HAVE_SBRK
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long space_at_cmd_start = 0;
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#endif
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extern int display_time;
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extern int display_space;
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#if defined(TUI)
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extern int insert_mode;
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#endif
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quit_flag = 0;
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if (instream == stdin && stdin_is_tty)
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reinitialize_more_filter ();
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old_chain = make_cleanup ((make_cleanup_func) command_loop_marker, 0);
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#if defined(TUI)
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insert_mode = 0;
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#endif
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/* If readline returned a NULL command, it means that the
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connection with the terminal is gone. This happens at the
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end of a testsuite run, after Expect has hung up
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but GDB is still alive. In such a case, we just quit gdb
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killing the inferior program too. */
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if (command == 0)
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quit_command ((char *) 0, stdin == instream);
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time_at_cmd_start = get_run_time ();
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if (display_space)
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{
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#ifdef HAVE_SBRK
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extern char **environ;
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char *lim = (char *) sbrk (0);
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space_at_cmd_start = (long) (lim - (char *) &environ);
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#endif
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}
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execute_command (command, instream == stdin);
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/* Do any commands attached to breakpoint we stopped at. */
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bpstat_do_actions (&stop_bpstat);
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do_cleanups (old_chain);
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if (display_time)
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{
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long cmd_time = get_run_time () - time_at_cmd_start;
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printf_unfiltered ("Command execution time: %ld.%06ld\n",
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cmd_time / 1000000, cmd_time % 1000000);
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}
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if (display_space)
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{
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#ifdef HAVE_SBRK
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extern char **environ;
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char *lim = (char *) sbrk (0);
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long space_now = lim - (char *) &environ;
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long space_diff = space_now - space_at_cmd_start;
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printf_unfiltered ("Space used: %ld (%c%ld for this command)\n",
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space_now,
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(space_diff >= 0 ? '+' : '-'),
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space_diff);
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#endif
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}
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}
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/* Handle a complete line of input. This is called by the callback
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mechanism within the readline library. Deal with incomplete commands
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as well, by saving the partial input in a global buffer. */
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/* NOTE: 1999-04-30 This is the asynchronous version of the
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command_line_input function. command_line_input will become
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obsolete once we use the event loop as the default mechanism in
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GDB. */
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static void
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command_line_handler (rl)
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char *rl;
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{
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static char *linebuffer = 0;
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static unsigned linelength = 0;
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register char *p;
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char *p1;
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int change_prompt = 0;
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extern char *line;
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extern int linesize;
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char *nline;
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char got_eof = 0;
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int repeat = (instream == stdin);
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if (annotation_level > 1 && instream == stdin)
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{
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printf_unfiltered ("\n\032\032post-");
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printf_unfiltered (async_annotation_suffix);
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printf_unfiltered ("\n");
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}
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if (linebuffer == 0)
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{
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linelength = 80;
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linebuffer = (char *) xmalloc (linelength);
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}
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p = linebuffer;
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||
if (more_to_come)
|
||
{
|
||
strcpy (linebuffer, readline_input_state.linebuffer);
|
||
p = readline_input_state.linebuffer_ptr;
|
||
free (readline_input_state.linebuffer);
|
||
more_to_come = 0;
|
||
change_prompt = 1;
|
||
}
|
||
|
||
#ifdef STOP_SIGNAL
|
||
if (job_control)
|
||
signal (STOP_SIGNAL, stop_sig);
|
||
#endif
|
||
|
||
/* Make sure that all output has been output. Some machines may let
|
||
you get away with leaving out some of the gdb_flush, but not all. */
|
||
wrap_here ("");
|
||
gdb_flush (gdb_stdout);
|
||
gdb_flush (gdb_stderr);
|
||
|
||
if (source_file_name != NULL)
|
||
{
|
||
++source_line_number;
|
||
sprintf (source_error,
|
||
"%s%s:%d: Error in sourced command file:\n",
|
||
source_pre_error,
|
||
source_file_name,
|
||
source_line_number);
|
||
error_pre_print = source_error;
|
||
}
|
||
|
||
/* If we are in this case, then command_handler will call quit
|
||
and exit from gdb. */
|
||
if (!rl || rl == (char *) EOF)
|
||
{
|
||
got_eof = 1;
|
||
command_handler (0);
|
||
}
|
||
if (strlen (rl) + 1 + (p - linebuffer) > linelength)
|
||
{
|
||
linelength = strlen (rl) + 1 + (p - linebuffer);
|
||
nline = (char *) xrealloc (linebuffer, linelength);
|
||
p += nline - linebuffer;
|
||
linebuffer = nline;
|
||
}
|
||
p1 = rl;
|
||
/* Copy line. Don't copy null at end. (Leaves line alone
|
||
if this was just a newline) */
|
||
while (*p1)
|
||
*p++ = *p1++;
|
||
|
||
free (rl); /* Allocated in readline. */
|
||
|
||
if (p == linebuffer || *(p - 1) == '\\')
|
||
{
|
||
/* We come here also if the line entered is empty (just a 'return') */
|
||
p--; /* Put on top of '\'. */
|
||
|
||
if (*p == '\\')
|
||
{
|
||
readline_input_state.linebuffer = savestring (linebuffer,
|
||
strlen (linebuffer));
|
||
readline_input_state.linebuffer_ptr = p;
|
||
|
||
/* We will not invoke a execute_command if there is more
|
||
input expected to complete the command. So, we need to
|
||
print an empty prompt here. */
|
||
display_gdb_prompt ("");
|
||
more_to_come = 1;
|
||
}
|
||
}
|
||
|
||
#ifdef STOP_SIGNAL
|
||
if (job_control)
|
||
signal (STOP_SIGNAL, SIG_DFL);
|
||
#endif
|
||
|
||
#define SERVER_COMMAND_LENGTH 7
|
||
server_command =
|
||
(p - linebuffer > SERVER_COMMAND_LENGTH)
|
||
&& STREQN (linebuffer, "server ", SERVER_COMMAND_LENGTH);
|
||
if (server_command)
|
||
{
|
||
/* Note that we don't set `line'. Between this and the check in
|
||
dont_repeat, this insures that repeating will still do the
|
||
right thing. */
|
||
*p = '\0';
|
||
command_handler (linebuffer + SERVER_COMMAND_LENGTH);
|
||
display_gdb_prompt (0);
|
||
return;
|
||
}
|
||
|
||
/* Do history expansion if that is wished. */
|
||
if (history_expansion_p && instream == stdin
|
||
&& ISATTY (instream))
|
||
{
|
||
char *history_value;
|
||
int expanded;
|
||
|
||
*p = '\0'; /* Insert null now. */
|
||
expanded = history_expand (linebuffer, &history_value);
|
||
if (expanded)
|
||
{
|
||
/* Print the changes. */
|
||
printf_unfiltered ("%s\n", history_value);
|
||
|
||
/* If there was an error, call this function again. */
|
||
if (expanded < 0)
|
||
{
|
||
free (history_value);
|
||
return;
|
||
}
|
||
if (strlen (history_value) > linelength)
|
||
{
|
||
linelength = strlen (history_value) + 1;
|
||
linebuffer = (char *) xrealloc (linebuffer, linelength);
|
||
}
|
||
strcpy (linebuffer, history_value);
|
||
p = linebuffer + strlen (linebuffer);
|
||
free (history_value);
|
||
}
|
||
}
|
||
|
||
/* If we just got an empty line, and that is supposed
|
||
to repeat the previous command, return the value in the
|
||
global buffer. */
|
||
if (repeat && p == linebuffer && *p != '\\')
|
||
{
|
||
command_handler (line);
|
||
display_gdb_prompt (0);
|
||
return;
|
||
}
|
||
|
||
for (p1 = linebuffer; *p1 == ' ' || *p1 == '\t'; p1++);
|
||
if (repeat && !*p1)
|
||
{
|
||
command_handler (line);
|
||
display_gdb_prompt (0);
|
||
return;
|
||
}
|
||
|
||
*p = 0;
|
||
|
||
/* Add line to history if appropriate. */
|
||
if (instream == stdin
|
||
&& ISATTY (stdin) && *linebuffer)
|
||
add_history (linebuffer);
|
||
|
||
/* Note: lines consisting solely of comments are added to the command
|
||
history. This is useful when you type a command, and then
|
||
realize you don't want to execute it quite yet. You can comment
|
||
out the command and then later fetch it from the value history
|
||
and remove the '#'. The kill ring is probably better, but some
|
||
people are in the habit of commenting things out. */
|
||
if (*p1 == '#')
|
||
*p1 = '\0'; /* Found a comment. */
|
||
|
||
/* Save into global buffer if appropriate. */
|
||
if (repeat)
|
||
{
|
||
if (linelength > linesize)
|
||
{
|
||
line = xrealloc (line, linelength);
|
||
linesize = linelength;
|
||
}
|
||
strcpy (line, linebuffer);
|
||
if (!more_to_come)
|
||
{
|
||
command_handler (line);
|
||
display_gdb_prompt (0);
|
||
}
|
||
return;
|
||
}
|
||
|
||
command_handler (linebuffer);
|
||
display_gdb_prompt (0);
|
||
return;
|
||
}
|
||
|
||
/* Does reading of input from terminal w/o the editing features
|
||
provided by the readline library. */
|
||
|
||
/* NOTE: 1999-04-30 Asynchronous version of gdb_readline. gdb_readline
|
||
will become obsolete when the event loop is made the default
|
||
execution for gdb. */
|
||
static void
|
||
gdb_readline2 ()
|
||
{
|
||
int c;
|
||
char *result;
|
||
int input_index = 0;
|
||
int result_size = 80;
|
||
|
||
result = (char *) xmalloc (result_size);
|
||
|
||
/* We still need the while loop here, even though it would seem
|
||
obvious to invoke gdb_readline2 at every character entered. If
|
||
not using the readline library, the terminal is in cooked mode,
|
||
which sends the characters all at once. Poll will notice that the
|
||
input fd has changed state only after enter is pressed. At this
|
||
point we still need to fetch all the chars entered. */
|
||
|
||
while (1)
|
||
{
|
||
/* Read from stdin if we are executing a user defined command.
|
||
This is the right thing for prompt_for_continue, at least. */
|
||
c = fgetc (instream ? instream : stdin);
|
||
|
||
if (c == EOF)
|
||
{
|
||
if (input_index > 0)
|
||
/* The last line does not end with a newline. Return it, and
|
||
if we are called again fgetc will still return EOF and
|
||
we'll return NULL then. */
|
||
break;
|
||
free (result);
|
||
command_line_handler (0);
|
||
}
|
||
|
||
if (c == '\n')
|
||
#ifndef CRLF_SOURCE_FILES
|
||
break;
|
||
#else
|
||
{
|
||
if (input_index > 0 && result[input_index - 1] == '\r')
|
||
input_index--;
|
||
break;
|
||
}
|
||
#endif
|
||
|
||
result[input_index++] = c;
|
||
while (input_index >= result_size)
|
||
{
|
||
result_size *= 2;
|
||
result = (char *) xrealloc (result, result_size);
|
||
}
|
||
}
|
||
|
||
result[input_index++] = '\0';
|
||
command_line_handler (result);
|
||
}
|
||
|
||
|
||
/* Initialization of signal handlers and tokens. There is a function
|
||
handle_sig* for each of the signals GDB cares about. Specifically:
|
||
SIGINT, SIGFPE, SIGQUIT, SIGTSTP, SIGHUP, SIGWINCH. These
|
||
functions are the actual signal handlers associated to the signals
|
||
via calls to signal(). The only job for these functions is to
|
||
enqueue the appropriate event/procedure with the event loop. Such
|
||
procedures are the old signal handlers. The event loop will take
|
||
care of invoking the queued procedures to perform the usual tasks
|
||
associated with the reception of the signal. */
|
||
/* NOTE: 1999-04-30 This is the asynchronous version of init_signals.
|
||
init_signals will become obsolete as we move to have to event loop
|
||
as the default for gdb. */
|
||
void
|
||
async_init_signals ()
|
||
{
|
||
signal (SIGINT, handle_sigint);
|
||
sigint_token =
|
||
create_async_signal_handler ((async_handler_func *) async_request_quit, NULL);
|
||
|
||
/* If SIGTRAP was set to SIG_IGN, then the SIG_IGN will get passed
|
||
to the inferior and breakpoints will be ignored. */
|
||
#ifdef SIGTRAP
|
||
signal (SIGTRAP, SIG_DFL);
|
||
#endif
|
||
|
||
/* If we initialize SIGQUIT to SIG_IGN, then the SIG_IGN will get
|
||
passed to the inferior, which we don't want. It would be
|
||
possible to do a "signal (SIGQUIT, SIG_DFL)" after we fork, but
|
||
on BSD4.3 systems using vfork, that can affect the
|
||
GDB process as well as the inferior (the signal handling tables
|
||
might be in memory, shared between the two). Since we establish
|
||
a handler for SIGQUIT, when we call exec it will set the signal
|
||
to SIG_DFL for us. */
|
||
signal (SIGQUIT, handle_sigquit);
|
||
sigquit_token =
|
||
create_async_signal_handler ((async_handler_func *) async_do_nothing, NULL);
|
||
#ifdef SIGHUP
|
||
if (signal (SIGHUP, handle_sighup) != SIG_IGN)
|
||
sighup_token =
|
||
create_async_signal_handler ((async_handler_func *) async_disconnect, NULL);
|
||
else
|
||
sighup_token =
|
||
create_async_signal_handler ((async_handler_func *) async_do_nothing, NULL);
|
||
#endif
|
||
signal (SIGFPE, handle_sigfpe);
|
||
sigfpe_token =
|
||
create_async_signal_handler ((async_handler_func *) async_float_handler, NULL);
|
||
|
||
#if defined(SIGWINCH) && defined(SIGWINCH_HANDLER)
|
||
signal (SIGWINCH, handle_sigwinch);
|
||
sigwinch_token =
|
||
create_async_signal_handler ((async_handler_func *) SIGWINCH_HANDLER, NULL);
|
||
#endif
|
||
}
|
||
|
||
/* Tell the event loop what to do if SIGINT is received.
|
||
See event-signal.c. */
|
||
void
|
||
handle_sigint (sig)
|
||
int sig;
|
||
{
|
||
signal (sig, handle_sigint);
|
||
|
||
/* If immediate_quit is set, we go ahead and process the SIGINT right
|
||
away, even if we usually would defer this to the event loop. The
|
||
assumption here is that it is safe to process ^C immediately if
|
||
immediate_quit is set. If we didn't, SIGINT would be really
|
||
processed only the next time through the event loop. To get to
|
||
that point, though, the command that we want to interrupt needs to
|
||
finish first, which is unacceptable. */
|
||
if (immediate_quit)
|
||
async_request_quit ();
|
||
else
|
||
/* If immediate quit is not set, we process SIGINT the next time
|
||
through the loop, which is fine. */
|
||
mark_async_signal_handler (sigint_token);
|
||
}
|
||
|
||
/* Do the quit. All the checks have been done by the caller. */
|
||
void
|
||
async_request_quit ()
|
||
{
|
||
quit_flag = 1;
|
||
#ifdef REQUEST_QUIT
|
||
REQUEST_QUIT;
|
||
#else
|
||
quit ();
|
||
#endif
|
||
}
|
||
|
||
/* Tell the event loop what to do if SIGQUIT is received.
|
||
See event-signal.c. */
|
||
void
|
||
handle_sigquit (sig)
|
||
int sig;
|
||
{
|
||
mark_async_signal_handler (sigquit_token);
|
||
signal (sig, handle_sigquit);
|
||
}
|
||
|
||
/* Called by the event loop in response to a SIGQUIT. */
|
||
void
|
||
async_do_nothing ()
|
||
{
|
||
/* Empty function body. */
|
||
}
|
||
|
||
#ifdef SIGHUP
|
||
/* Tell the event loop what to do if SIGHUP is received.
|
||
See event-signal.c. */
|
||
void
|
||
handle_sighup (sig)
|
||
int sig;
|
||
{
|
||
mark_async_signal_handler (sighup_token);
|
||
signal (sig, handle_sighup);
|
||
}
|
||
|
||
/* Called by the event loop to process a SIGHUP. */
|
||
void
|
||
async_disconnect ()
|
||
{
|
||
catch_errors (quit_cover, NULL,
|
||
"Could not kill the program being debugged",
|
||
RETURN_MASK_ALL);
|
||
signal (SIGHUP, SIG_DFL); /*FIXME: ??????????? */
|
||
kill (getpid (), SIGHUP);
|
||
}
|
||
#endif
|
||
|
||
/* Tell the event loop what to do if SIGFPE is received.
|
||
See event-signal.c. */
|
||
void
|
||
handle_sigfpe (sig)
|
||
int sig;
|
||
{
|
||
mark_async_signal_handler (sigfpe_token);
|
||
signal (sig, handle_sigfpe);
|
||
}
|
||
|
||
/* Event loop will call this functin to process a SIGFPE. */
|
||
void
|
||
async_float_handler ()
|
||
{
|
||
/* This message is based on ANSI C, section 4.7. Note that integer
|
||
divide by zero causes this, so "float" is a misnomer. */
|
||
error ("Erroneous arithmetic operation.");
|
||
}
|
||
|
||
/* Tell the event loop what to do if SIGWINCH is received.
|
||
See event-signal.c. */
|
||
#if defined(SIGWINCH) && defined(SIGWINCH_HANDLER)
|
||
void
|
||
handle_sigwinch (sig)
|
||
int sig;
|
||
{
|
||
mark_async_signal_handler (sigwinch_token);
|
||
signal (sig, handle_sigwinch);
|
||
}
|
||
#endif
|
||
|
||
|
||
/* Called by do_setshow_command. */
|
||
/* ARGSUSED */
|
||
void
|
||
set_async_editing_command (args, from_tty, c)
|
||
char *args;
|
||
int from_tty;
|
||
struct cmd_list_element *c;
|
||
{
|
||
change_line_handler ();
|
||
}
|
||
|
||
/* Called by do_setshow_command. */
|
||
/* ARGSUSED */
|
||
void
|
||
set_async_annotation_level (args, from_tty, c)
|
||
char *args;
|
||
int from_tty;
|
||
struct cmd_list_element *c;
|
||
{
|
||
change_annotation_level ();
|
||
}
|
||
|
||
/* Called by do_setshow_command. */
|
||
/* ARGSUSED */
|
||
void
|
||
set_async_prompt (args, from_tty, c)
|
||
char *args;
|
||
int from_tty;
|
||
struct cmd_list_element *c;
|
||
{
|
||
PROMPT (0) = savestring (new_async_prompt, strlen (new_async_prompt));
|
||
}
|
||
|
||
|
||
|
||
|