|
| Compare with
| https://lists.gnu.org/archive/html/bug-gnu-emacs/2015-07/msg00287.html
|
| Based on git commit 4d7e6e51dd4acecff466a28d958c50f34fc130b8

From: Mike Crowe
Subject: [PATCH] Re-enable SIGIO when waiting for events
Date: Sat, 11 Jul 2015 12:58:00 +0100

Pasting a large string into an Emacs tty frame causes
keyboard.c:kbd_buffer_store_buffered_event to call ignore_sigio()
which sets SIGIO to SIG_IGN.

Unfortunately no-one seems to ever re-enable the SIGIO handler.

This leads to timeouts when attempting to paste into an Emacs X11
frame as reported at
http://debbugs.gnu.org/cgi/bugreport.cgi?bug=16737 .

It appears that keyboard.c:kbd_buffer_get_event used to re-enable the
signal handler but that was removed as part of a large signal-handling
clean up in 4d7e6e51dd4acecff466a28d958c50f34fc130b8.

Reinstating the re-enabling of SIGIO in kbd_buffer_get_event solves
the problems reported in bug 16737 for me.

* src/keyboard.c (kbd_buffer_get_event): Re-enable SIGIO when waiting
  for event.
---
 src/keyboard.c |   10 ++++++++++
 1 file changed, 10 insertions(+)

--- src/keyboard.c
+++ src/keyboard.c	2016-03-10 07:39:35.770752804 +0000
@@ -364,6 +364,8 @@ static ptrdiff_t echo_length (void);
 
 static Lisp_Object Qpolling_period;
 
+static void deliver_input_available_signal (int sig);
+
 /* Incremented whenever a timer is run.  */
 unsigned timers_run;
 
@@ -3829,6 +3831,14 @@ kbd_buffer_get_event (KBOARD **kbp,
       /* Start reading input again because we have processed enough to
          be able to accept new events again.  */
       unhold_keyboard_input ();
+#ifdef USABLE_SIGIO
+      if (!noninteractive)
+       {
+         struct sigaction action;
+         emacs_sigaction_init (&action, deliver_input_available_signal);
+         sigaction (SIGIO, &action, 0);
+       }
+#endif
       start_polling ();
     }
 #endif	/* subprocesses */