[PATCH] Fix IXANY and restart after signal (e.g. ctrl-C) in n_tty line discipline
- From: Joe Peterson <joe@xxxxxxxxxxx>
- Date: Sat, 22 Dec 2007 07:19:58 -0700
Here is a patch that fixes a couple of issues with ttys in the stopped
state. See patch below for more details.
Note that this patch assumes that my previous patch from last month
(called "tty-enable-the-echoing-of-c-in-the-n_tty-discipline.patch" in
the -mm tree) has been applied, since part of this patch is adjacent to
that code.
Happy holidays! Joe
Fix two N_TTY line discipline issues related to resuming a stopped TTY
(typically done with ctrl-S):
1) Fix handling of character that resumes a stopped TTY (with IXANY)
With "stty ixany", the TTY line discipline would lose the first character
after the stop, so typing, for example, "hi^Sthere" resulted in "hihere"
(the 't' would cause the resume after ^S, but it would then be thrown away
rather than processed as an input character). This was inconsistent with
the behavior of other Unix systems.
2) Fix interrupt signal (e.g. ctrl-C) behavior in stopped TTYs
With "stty -ixany" (often the default), interrupt signals were ignored
in a stopped TTY until the TTY was resumed with the start char (typically
ctrl-Q), which was inconsistent with the behavior of other Unix systems.
Signed-off-by: Joe Peterson <joe@xxxxxxxxxxx>
---
diff -puN a/drivers/char/n_tty.c~tty-fix-ixany-and-restart-after-signal-in-the-n_tty-discipline a/drivers/char/n_tty.c
--- a/drivers/char/n_tty.c~tty-fix-ixany-and-restart-after-signal-in-the-n_tty-discipline 2007-12-20 11:35:05.000000000 -0700
+++ a/drivers/char/n_tty.c 2007-12-20 11:35:36.000000000 -0700
@@ -695,11 +695,8 @@ static inline void n_tty_receive_char(st
return;
}
- if (tty->stopped && !tty->flow_stopped &&
- I_IXON(tty) && I_IXANY(tty)) {
+ if (tty->stopped && !tty->flow_stopped && I_IXON(tty) && I_IXANY(tty))
start_tty(tty);
- return;
- }
if (I_ISTRIP(tty))
c &= 0x7f;
@@ -769,6 +766,8 @@ static inline void n_tty_receive_char(st
signal = SIGTSTP;
if (c == SUSP_CHAR(tty)) {
send_signal:
+ if (tty->stopped && !tty->flow_stopped && I_IXON(tty))
+ start_tty(tty);
/*
* Echo character, and then send the signal.
* Note that we do not use isig() here because we want
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