From ec5b1157f8e819c72fc93aa6d2d5117c08cdc961 Mon Sep 17 00:00:00 2001 From: Joe Peterson Date: Wed, 6 Feb 2008 01:37:38 -0800 Subject: [PATCH] tty: enable the echoing of ^C in the N_TTY discipline Turn on INTR/QUIT/SUSP echoing in the N_TTY line discipline (e.g. ctrl-C will appear as "^C" if stty echoctl is set and ctrl-C is set as INTR). Linux seems to be the only unix-like OS (recently I've verified this on Solaris, BSD, and Mac OS X) that does *not* behave this way, and I really miss this as a good visual confirmation of the interrupt of a program in the console or xterm. I remember this fondly from many Unixs I've used over the years as well. Bringing this to Linux also seems like a good way to make it yet more compliant with standard unix-like behavior. [akpm@linux-foundation.org: coding-style fixes] Cc: Alan Cox Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/char/n_tty.c | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) diff --git a/drivers/char/n_tty.c b/drivers/char/n_tty.c index 596c7173997b..e0e3815f92ba 100644 --- a/drivers/char/n_tty.c +++ b/drivers/char/n_tty.c @@ -769,7 +769,21 @@ static inline void n_tty_receive_char(struct tty_struct *tty, unsigned char c) signal = SIGTSTP; if (c == SUSP_CHAR(tty)) { send_signal: - isig(signal, tty, 0); + /* + * 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); + if (tty->driver->flush_buffer) + tty->driver->flush_buffer(tty); + } + if (L_ECHO(tty)) + echo_char(c, tty); + if (tty->pgrp) + kill_pgrp(tty->pgrp, signal, 1); return; } } -- GitLab