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bug#12450: Remove configure's --without-sync-input option.

From: Paul Eggert
Subject: bug#12450: Remove configure's --without-sync-input option.
Date: Sun, 16 Sep 2012 09:30:27 -0700
User-agent: Mozilla/5.0 (X11; Linux i686; rv:15.0) Gecko/20120827 Thunderbird/15.0 
On 09/16/2012 08:45 AM, Eli Zaretskii wrote:
>> - The keyboard input or the X event causes a signal to be delivered.
> Which signals are those, specifically?

SIGWINCH for window changes.

SIGIO, SIGINT and SIGQUIT for keyboard input, if interactive.
But SIGIO is not used on platforms where it doesn't work.
And SIGQUIT is not caught on DOS_NT.
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