Merge from origin/emacs-25

[gnu-emacs] / src / keyboard.c

diff --git a/src/keyboard.c b/src/keyboard.c
index ef86e69bf91d28e49e5de9df6126720762f43553..b8e0a6d88ea48fc37428e8627c203abf1e807960 100644 (file)
--- a/src/keyboard.c
+++ b/src/keyboard.c
@@ -7,8 +7,8 @@ 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
@@ -427,6 +427,15 @@ kset_system_key_syms (struct kboard *kb, Lisp_Object val)
 }
 
 \f
+static bool
+echo_keystrokes_p (void)
+{
+  return (!cursor_in_echo_area)
+        && (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.  */
@@ -568,7 +577,9 @@ echo_update (void)
 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 ();
@@ -2270,13 +2281,6 @@ read_decoded_event_from_main_queue (struct timespec *end_time,
     }
 }
 
-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.
@@ -5968,7 +5972,6 @@ make_lispy_event (struct input_event *event)
       }
 #endif
 
-
 #if defined HAVE_INOTIFY || defined HAVE_KQUEUE || defined HAVE_GFILENOTIFY
     case FILE_NOTIFY_EVENT:
       {
@@ -8890,11 +8893,15 @@ read_key_sequence (Lisp_Object *keybuf, int bufsize, Lisp_Object prompt,
             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
-              && echo_keystrokes_p ())
+      else if (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.  */
        echo_dash ();
@@ -10300,6 +10307,9 @@ handle_interrupt (bool in_signal_handler)
         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)
@@ -11373,7 +11383,7 @@ See Info node `(elisp)Multiple Terminals'.  */);
 
   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,
@@ -11587,7 +11597,7 @@ immediately after running `post-command-hook'.  */);
   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.
@@ -11704,6 +11714,25 @@ Currently, the only supported values for this
 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);
 }