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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 <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Joe Peterson 2008-02-06 01:37:38 -08:00 committed by Linus Torvalds
parent 1a669c2f16
commit ec5b1157f8
1 changed files with 15 additions and 1 deletions
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16
drivers/char/n_tty.c
View File

@ -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;
}
}