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

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Message-ID: <87abh2rpzg.fsf@denkblock.local>
Date:	Tue, 01 Jul 2008 10:02:59 +0200
From:	Elias Oltmanns <eo@...ensachen.de>
To:	Török Edwin <edwintorok@...il.com>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Joe Peterson <joe@...rush.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: Ctrl+C doesn't interrupt process waiting for I/O

Elias Oltmanns <eo@...ensachen.de> wrote:
[...]
> The following patch to 2.6.26-rc8 fixes the issue for me.

Sorry, resending without MIME encoding the message.

Regards,

Elias


--------
From: Elias Oltmanns <eo@...ensachen.de>
Subject: Make sure that interrupt characters get through reliably

Since commit ec5b1157f8e819c72fc93aa6d2d5117c08cdc961, users have been
unable to interrupt interactive processes reliably by pressing CTRL+C.
This patch reverts the original commit except for the most important
part: actually echoing ^C is preserved.

Signed-off-by: Elias Oltmanns <eo@...ensachen.de>
---

 drivers/char/n_tty.c |   13 +------------
 1 files changed, 1 insertions(+), 12 deletions(-)

diff --git a/drivers/char/n_tty.c b/drivers/char/n_tty.c
index 8096389..74018ef 100644
--- a/drivers/char/n_tty.c
+++ b/drivers/char/n_tty.c
@@ -759,20 +759,9 @@ static inline void n_tty_receive_char(struct tty_struct *tty, unsigned char c)
 		signal = SIGTSTP;
 		if (c == SUSP_CHAR(tty)) {
 send_signal:
-			/*
-			 * Echo character, and then send the signal.
-			 * Note that we do not use isig() here because we want
-			 * the order to be:
-			 * 1) flush, 2) echo, 3) signal
-			 */
-			if (!L_NOFLSH(tty)) {
-				n_tty_flush_buffer(tty);
-				tty_driver_flush_buffer(tty);
-			}
 			if (L_ECHO(tty))
 				echo_char(c, tty);
-			if (tty->pgrp)
-				kill_pgrp(tty->pgrp, signal, 1);
+			isig(signal, tty, 0);
 			return;
 		}
 	}
--
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