linux-kernel - Re: Ctrl+C doesn't interrupt process waiting for I/O

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Date:	Tue, 01 Jul 2008 06:07:32 -0600
From:	Joe Peterson <joe@...rush.com>
To:	Török Edwin <edwintorok@...il.com>
CC:	Elias Oltmanns <eo@...ensachen.de>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: Ctrl+C doesn't interrupt process waiting for I/O

Török Edwin wrote:
> Thanks for the patch , the process seems to respond faster to Ctrl-C,
> but I'll have to find a way to measure that reliably.
> However ^C is not echoed anymore for me.

I found the same thing when I originally did the ^C echo patch.  If isig() was
used instead of the order specified (flush, echo, signal), the ^C did not echo
reliably (i.e., it echoed on a tty console, but not in an xterm).  isig() does
the kill, then the flush.

Note that ^Z uses the same logic, so the fact that you are seeing this take
effect more quickly is interesting.

I will try a few things today, but please experiment with various orderings of
the calls and let me know what you find (and test the ^C echo in both tty
console and xterm).

						-Joe
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