From: Joe Peterson 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 Cc: Alan Cox Signed-off-by: Andrew Morton --- drivers/char/n_tty.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) diff -puN drivers/char/n_tty.c~fix-ixany-and-restart-after-signal-eg-ctrl-c-in-n_tty-line-discipline drivers/char/n_tty.c --- a/drivers/char/n_tty.c~fix-ixany-and-restart-after-signal-eg-ctrl-c-in-n_tty-line-discipline +++ a/drivers/char/n_tty.c @@ -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 _