/* Keyboard and mouse input; editor command loop.
-Copyright (C) 1985-1989, 1993-1997, 1999-2015 Free Software Foundation,
+Copyright (C) 1985-1989, 1993-1997, 1999-2016 Free Software Foundation,
Inc.
This file is part of GNU Emacs.
GNU Emacs is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 3 of the License, or
-(at your option) any later version.
+the Free Software Foundation, either version 3 of the License, or (at
+your option) any later version.
GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
#include <unistd.h>
#include <fcntl.h>
+#include <ignore-value.h>
+
#ifdef HAVE_WINDOW_SYSTEM
#include TERM_HEADER
#endif /* HAVE_WINDOW_SYSTEM */
+/* Work around GCC bug 54561. */
+#if GNUC_PREREQ (4, 3, 0)
+# pragma GCC diagnostic ignored "-Wclobbered"
+#endif
+
/* Variables for blockinput.h: */
/* Positive if interrupt input is blocked right now. */
}
\f
+static bool
+echo_keystrokes_p (void)
+{
+ return (FLOATP (Vecho_keystrokes) ? XFLOAT_DATA (Vecho_keystrokes) > 0.0
+ : INTEGERP (Vecho_keystrokes) ? XINT (Vecho_keystrokes) > 0
+ : false);
+}
+
/* Add C to the echo string, without echoing it immediately. C can be
a character, which is pretty-printed, or a symbol, whose name is
printed. */
static void
echo_now (void)
{
- if (!current_kboard->immediate_echo)
+ if (!current_kboard->immediate_echo
+ /* This test breaks calls that use `echo_now' to display the echo_prompt.
+ && echo_keystrokes_p () */)
{
current_kboard->immediate_echo = true;
echo_update ();
specbind (Qinhibit_redisplay, Qnil);
redisplaying_p = 0;
+ /* This variable stores buffers that have changed so that an undo
+ boundary can be added. specbind this so that changes in the
+ recursive edit will not result in undo boundaries in buffers
+ changed before we entered there recursive edit.
+ See Bug #23632.
+ */
+ specbind (Qundo_auto__undoably_changed_buffers, Qnil);
+
val = command_loop ();
if (EQ (val, Qt))
Fsignal (Qquit, Qnil);
Lisp_Object
command_loop_1 (void)
{
- Lisp_Object cmd;
- Lisp_Object keybuf[30];
- int i;
EMACS_INT prev_modiff = 0;
struct buffer *prev_buffer = NULL;
bool already_adjusted = 0;
while (1)
{
+ Lisp_Object cmd;
+ Lisp_Object keybuf[30];
+ int i;
+
if (! FRAME_LIVE_P (XFRAME (selected_frame)))
Fkill_emacs (Qnil);
{
Lisp_Object c = Qnil;
sys_jmp_buf save_jump;
- KBOARD *kb IF_LINT (= NULL);
+ KBOARD *kb;
start:
Lisp_Object prev_event,
bool *used_mouse_menu)
{
-#define MAX_ENCODED_BYTES 16
#ifndef WINDOWSNT
+#define MAX_ENCODED_BYTES 16
Lisp_Object events[MAX_ENCODED_BYTES];
int n = 0;
#endif
}
}
-static bool
-echo_keystrokes_p (void)
-{
- return (FLOATP (Vecho_keystrokes) ? XFLOAT_DATA (Vecho_keystrokes) > 0.0
- : INTEGERP (Vecho_keystrokes) ? XINT (Vecho_keystrokes) > 0 : false);
-}
-
/* Read a character from the keyboard; call the redisplay if needed. */
/* commandflag 0 means do not autosave, but do redisplay.
-1 means do not redisplay, but do autosave.
if (KEYMAPP (map) && INTERACTIVE
&& !NILP (prev_event) && ! EVENT_HAS_PARAMETERS (prev_event)
/* Don't bring up a menu if we already have another event. */
- && NILP (Vunread_command_events)
+ && !CONSP (Vunread_command_events)
&& !detect_input_pending_run_timers (0))
{
c = read_char_minibuf_menu_prompt (commandflag, map);
&& !EQ (XCAR (prev_event), Qmenu_bar)
&& !EQ (XCAR (prev_event), Qtool_bar)
/* Don't bring up a menu if we already have another event. */
- && NILP (Vunread_command_events))
+ && !CONSP (Vunread_command_events))
{
c = read_char_x_menu_prompt (map, prev_event, used_mouse_menu);
last_input_event = c;
call4 (Qcommand_execute, tem, Qnil, Fvector (1, &last_input_event), Qt);
- if (CONSP (c) && EQ (XCAR (c), Qselect_window) && !end_time)
+ if (CONSP (c)
+ && (EQ (XCAR (c), Qselect_window)
+#ifdef HAVE_DBUS
+ || EQ (XCAR (c), Qdbus_event)
+#endif
+#ifdef USE_FILE_NOTIFY
+ || EQ (XCAR (c), Qfile_notify)
+#endif
+ || EQ (XCAR (c), Qconfig_changed_event))
+ && !end_time)
/* We stopped being idle for this event; undo that. This
prevents automatic window selection (under
- mouse_autoselect_window from acting as a real input event, for
+ mouse-autoselect-window) from acting as a real input event, for
example banishing the mouse under mouse-avoidance-mode. */
timer_resume_idle ();
else
store_kbd_macro_char (c);
- if (!recorded)
- {
- total_keys += total_keys < NUM_RECENT_KEYS;
- ASET (recent_keys, recent_keys_index, c);
- if (++recent_keys_index >= NUM_RECENT_KEYS)
- recent_keys_index = 0;
- }
- else if (recorded < 0)
+ /* recent_keys should not include events from keyboard macros. */
+ if (NILP (Vexecuting_kbd_macro))
{
- /* We need to remove one or two events from recent_keys.
- To do this, we simply put nil at those events and move the
- recent_keys_index backwards over those events. Usually,
- users will never see those nil events, as they will be
- overwritten by the command keys entered to see recent_keys
- (e.g. C-h l). */
-
- while (recorded++ < 0 && total_keys > 0)
+ if (!recorded)
{
- if (total_keys < NUM_RECENT_KEYS)
- total_keys--;
- if (--recent_keys_index < 0)
- recent_keys_index = NUM_RECENT_KEYS - 1;
- ASET (recent_keys, recent_keys_index, Qnil);
+ total_keys += total_keys < NUM_RECENT_KEYS;
+ ASET (recent_keys, recent_keys_index, c);
+ if (++recent_keys_index >= NUM_RECENT_KEYS)
+ recent_keys_index = 0;
+ }
+ else if (recorded < 0)
+ {
+ /* We need to remove one or two events from recent_keys.
+ To do this, we simply put nil at those events and move the
+ recent_keys_index backwards over those events. Usually,
+ users will never see those nil events, as they will be
+ overwritten by the command keys entered to see recent_keys
+ (e.g. C-h l). */
+
+ while (recorded++ < 0 && total_keys > 0)
+ {
+ if (total_keys < NUM_RECENT_KEYS)
+ total_keys--;
+ if (--recent_keys_index < 0)
+ recent_keys_index = NUM_RECENT_KEYS - 1;
+ ASET (recent_keys, recent_keys_index, Qnil);
+ }
}
- }
- num_nonmacro_input_events++;
+ num_nonmacro_input_events++;
+ }
/* Write c to the dribble file. If c is a lispy event, write
the event's symbol to the dribble file, in <brackets>. Bleaugh.
kbd_fetch_ptr = event + 1;
}
#endif
+
+#ifdef HAVE_NTGUI
+ else if (event->kind == END_SESSION_EVENT)
+ {
+ /* Make an event (end-session). */
+ obj = list1 (Qend_session);
+ kbd_fetch_ptr = event + 1;
+ }
+#endif
+
#if defined (HAVE_X11) || defined (HAVE_NTGUI) \
|| defined (HAVE_NS)
else if (event->kind == ICONIFY_EVENT)
obj = make_lispy_event (&event->ie);
kbd_fetch_ptr = event + 1;
}
+#endif
+#ifdef HAVE_XWIDGETS
+ else if (event->kind == XWIDGET_EVENT)
+ {
+ obj = make_lispy_event (&event->ie);
+ kbd_fetch_ptr = event + 1;
+ }
#endif
else if (event->kind == CONFIG_CHANGED_EVENT)
{
}
#endif /* HAVE_DBUS */
-#if defined HAVE_GFILENOTIFY || defined HAVE_INOTIFY
+#ifdef HAVE_XWIDGETS
+ case XWIDGET_EVENT:
+ {
+ return Fcons (Qxwidget_event, event->arg);
+ }
+#endif
+
+#if defined HAVE_INOTIFY || defined HAVE_KQUEUE || defined HAVE_GFILENOTIFY
case FILE_NOTIFY_EVENT:
{
return Fcons (Qfile_notify, event->arg);
}
-#endif /* defined HAVE_GFILENOTIFY || defined HAVE_INOTIFY */
+#endif /* HAVE_INOTIFY || HAVE_KQUEUE || HAVE_GFILENOTIFY */
case CONFIG_CHANGED_EVENT:
return list3 (Qconfig_changed_event,
the kbd_buffer can really hold. That may prevent loss
of characters on some systems when input is stuffed at us. */
unsigned char cbuf[KBD_BUFFER_SIZE - 1];
- int n_to_read, i;
+#ifndef WINDOWSNT
+ int n_to_read;
+#endif
+ int i;
struct tty_display_info *tty = terminal->display_info.tty;
int nread = 0;
#ifdef subprocesses
/* The length of the echo buffer when we started reading, and
the length of this_command_keys when we started reading. */
- ptrdiff_t echo_start IF_LINT (= 0);
+ ptrdiff_t echo_start UNINIT;
ptrdiff_t keys_start;
Lisp_Object current_binding = Qnil;
While we're reading, we keep the event here. */
Lisp_Object delayed_switch_frame;
- Lisp_Object original_uppercase IF_LINT (= Qnil);
+ Lisp_Object original_uppercase UNINIT;
int original_uppercase_position = -1;
/* Gets around Microsoft compiler limitations. */
of echoing, so that it serves as a prompt for the next
character. */
kset_echo_prompt (current_kboard, prompt);
+ /* FIXME: This use of echo_now doesn't look quite right and is ugly
+ since it forces us to fiddle with current_kboard->immediate_echo
+ before and after. */
current_kboard->immediate_echo = false;
echo_now ();
+ if (!echo_keystrokes_p ())
+ current_kboard->immediate_echo = false;
}
- else if (cursor_in_echo_area
+ else if (cursor_in_echo_area /* FIXME: Not sure why we test this here,
+ maybe we should just drop this test. */
&& echo_keystrokes_p ())
/* This doesn't put in a dash if the echo buffer is empty, so
you don't always see a dash hanging out in the minibuffer. */
while those allow us to restart the entire key sequence,
echo_local_start and keys_local_start allow us to throw away
just one key. */
- ptrdiff_t echo_local_start IF_LINT (= 0);
+ ptrdiff_t echo_local_start UNINIT;
int keys_local_start;
Lisp_Object new_binding;
bool
requeued_events_pending_p (void)
{
- return (!NILP (Vunread_command_events));
+ return (CONSP (Vunread_command_events));
}
DEFUN ("input-pending-p", Finput_pending_p, Sinput_pending_p, 0, 1, 0,
If CHECK-TIMERS is non-nil, timers that are ready to run will do so. */)
(Lisp_Object check_timers)
{
- if (!NILP (Vunread_command_events)
+ if (CONSP (Vunread_command_events)
|| !NILP (Vunread_post_input_method_events)
|| !NILP (Vunread_input_method_events))
return (Qt);
deliver_process_signal (sig, handle_interrupt_signal);
}
+/* Output MSG directly to standard output, without buffering. Ignore
+ failures. This is safe in a signal handler. */
+static void
+write_stdout (char const *msg)
+{
+ ignore_value (write (STDOUT_FILENO, msg, strlen (msg)));
+}
+
+/* Read a byte from stdin, without buffering. Safe in signal handlers. */
+static int
+read_stdin (void)
+{
+ char c;
+ return read (STDIN_FILENO, &c, 1) == 1 ? c : EOF;
+}
/* If Emacs is stuck because `inhibit-quit' is true, then keep track
of the number of times C-g has been requested. If C-g is pressed
sigemptyset (&blocked);
sigaddset (&blocked, SIGINT);
pthread_sigmask (SIG_BLOCK, &blocked, 0);
+ fflush (stdout);
}
- fflush (stdout);
reset_all_sys_modes ();
#ifdef SIGTSTP
/* Perhaps should really fork an inferior shell?
But that would not provide any way to get back
to the original shell, ever. */
- printf ("No support for stopping a process on this operating system;\n");
- printf ("you can continue or abort.\n");
+ write_stdout ("No support for stopping a process"
+ " on this operating system;\n"
+ "you can continue or abort.\n");
#endif /* not SIGTSTP */
#ifdef MSDOS
/* We must remain inside the screen area when the internal terminal
is used. Note that [Enter] is not echoed by dos. */
cursor_to (SELECTED_FRAME (), 0, 0);
#endif
+
+ write_stdout ("Emacs is resuming after an emergency escape.\n");
+
/* It doesn't work to autosave while GC is in progress;
the code used for auto-saving doesn't cope with the mark bit. */
if (!gc_in_progress)
{
- printf ("Auto-save? (y or n) ");
- fflush (stdout);
- if (((c = getchar ()) & ~040) == 'Y')
+ write_stdout ("Auto-save? (y or n) ");
+ c = read_stdin ();
+ if (c == 'y' || c == 'Y')
{
Fdo_auto_save (Qt, Qnil);
#ifdef MSDOS
- printf ("\r\nAuto-save done");
-#else /* not MSDOS */
- printf ("Auto-save done\n");
-#endif /* not MSDOS */
+ write_stdout ("\r\nAuto-save done");
+#else
+ write_stdout ("Auto-save done\n");
+#endif
}
- while (c != '\n') c = getchar ();
+ while (c != '\n')
+ c = read_stdin ();
}
else
{
/* During GC, it must be safe to reenable quitting again. */
Vinhibit_quit = Qnil;
+ write_stdout
+ (
#ifdef MSDOS
- printf ("\r\n");
-#endif /* not MSDOS */
- printf ("Garbage collection in progress; cannot auto-save now\r\n");
- printf ("but will instead do a real quit after garbage collection ends\r\n");
- fflush (stdout);
+ "\r\n"
+#endif
+ "Garbage collection in progress; cannot auto-save now\r\n"
+ "but will instead do a real quit"
+ " after garbage collection ends\r\n");
}
#ifdef MSDOS
- printf ("\r\nAbort? (y or n) ");
-#else /* not MSDOS */
- printf ("Abort (and dump core)? (y or n) ");
-#endif /* not MSDOS */
- fflush (stdout);
- if (((c = getchar ()) & ~040) == 'Y')
+ write_stdout ("\r\nAbort? (y or n) ");
+#else
+ write_stdout ("Abort (and dump core)? (y or n) ");
+#endif
+ c = read_stdin ();
+ if (c == 'y' || c == 'Y')
emacs_abort ();
- while (c != '\n') c = getchar ();
+ while (c != '\n')
+ c = read_stdin ();
#ifdef MSDOS
- printf ("\r\nContinuing...\r\n");
+ write_stdout ("\r\nContinuing...\r\n");
#else /* not MSDOS */
- printf ("Continuing...\n");
+ write_stdout ("Continuing...\n");
#endif /* not MSDOS */
- fflush (stdout);
init_all_sys_modes ();
}
else
DEFSYM (Qpost_command_hook, "post-command-hook");
DEFSYM (Qundo_auto__add_boundary, "undo-auto--add-boundary");
+ DEFSYM (Qundo_auto__undoably_changed_buffers,
+ "undo-auto--undoably-changed-buffers");
DEFSYM (Qdeferred_action_function, "deferred-action-function");
DEFSYM (Qdelayed_warnings_hook, "delayed-warnings-hook");
#ifdef HAVE_NTGUI
DEFSYM (Qlanguage_change, "language-change");
+ DEFSYM (Qend_session, "end-session");
#endif
#ifdef HAVE_DBUS
DEFSYM (Qdbus_event, "dbus-event");
#endif
+#ifdef HAVE_XWIDGETS
+ DEFSYM (Qxwidget_event, "xwidget-event");
+#endif
+
#ifdef USE_FILE_NOTIFY
DEFSYM (Qfile_notify, "file-notify");
#endif /* USE_FILE_NOTIFY */
DEFVAR_BOOL ("cannot-suspend", cannot_suspend,
doc: /* Non-nil means to always spawn a subshell instead of suspending.
-(Even if the operating system has support for stopping a process.) */);
+\(Even if the operating system has support for stopping a process.) */);
cannot_suspend = false;
DEFVAR_BOOL ("menu-prompting", menu_prompting,
DEFVAR_LISP ("input-method-function", Vinput_method_function,
doc: /* If non-nil, the function that implements the current input method.
It's called with one argument, a printing character that was just read.
-(That means a character with code 040...0176.)
+\(That means a character with code 040...0176.)
Typically this function uses `read-event' to read additional events.
When it does so, it should first bind `input-method-function' to nil
so it will not be called recursively.
DEFVAR_LISP ("disable-point-adjustment", Vdisable_point_adjustment,
doc: /* If non-nil, suppress point adjustment after executing a command.
-After a command is executed, if point is moved into a region that has
-special properties (e.g. composition, display), we adjust point to
-the boundary of the region. But, when a command sets this variable to
-non-nil, we suppress the point adjustment.
+After a command is executed, if point moved into a region that has
+special properties (e.g. composition, display), Emacs adjusts point to
+the boundary of the region. But when a command leaves this variable at
+a non-nil value (e.g., with a setq), this point adjustment is suppressed.
This variable is set to nil before reading a command, and is checked
just after executing the command. */);
DEFVAR_LISP ("global-disable-point-adjustment",
Vglobal_disable_point_adjustment,
- doc: /* If non-nil, always suppress point adjustment.
+ doc: /* If non-nil, always suppress point adjustments.
-The default value is nil, in which case, point adjustment are
-suppressed only after special commands that set
-`disable-point-adjustment' (which see) to non-nil. */);
+The default value is nil, in which case point adjustments are
+suppressed only after special commands that leave
+`disable-point-adjustment' (which see) at a non-nil value. */);
Vglobal_disable_point_adjustment = Qnil;
DEFVAR_LISP ("minibuffer-message-timeout", Vminibuffer_message_timeout,
variable are `sigusr1' and `sigusr2'. */);
Vdebug_on_event = intern_c_string ("sigusr2");
+ DEFVAR_BOOL ("attempt-stack-overflow-recovery",
+ attempt_stack_overflow_recovery,
+ doc: /* If non-nil, attempt to recover from C stack
+overflow. This recovery is unsafe and may lead to deadlocks or data
+corruption, but it usually works and may preserve modified buffers
+that would otherwise be lost. If nil, treat stack overflow like any
+other kind of crash. */);
+ attempt_stack_overflow_recovery = true;
+
+ DEFVAR_BOOL ("attempt-orderly-shutdown-on-fatal-signal",
+ attempt_orderly_shutdown_on_fatal_signal,
+ doc: /* If non-nil, attempt to perform an orderly
+shutdown when Emacs receives a fatal signal (e.g., a crash).
+This cleanup is unsafe and may lead to deadlocks or data corruption,
+but it usually works and may preserve modified buffers that would
+otherwise be lost. If nil, crash immediately in response to fatal
+signals. */);
+ attempt_orderly_shutdown_on_fatal_signal = true;
+
/* Create the initial keyboard. Qt means 'unset'. */
initial_kboard = allocate_kboard (Qt);
}
initial_define_lispy_key (Vspecial_event_map, "delete-frame",
"handle-delete-frame");
+#ifdef HAVE_NTGUI
+ initial_define_lispy_key (Vspecial_event_map, "end-session",
+ "kill-emacs");
+#endif
initial_define_lispy_key (Vspecial_event_map, "ns-put-working-text",
"ns-put-working-text");
initial_define_lispy_key (Vspecial_event_map, "ns-unput-working-text",