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n_tty: Output bells immediately on a full buffer

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This patch causes "bell" (^G) characters (invoked when the input buffer
is full) to be immediately output rather than filling the echo buffer.

This is especially a problem when the tty is stopped and buffers fill, since
the bells do not serve their purpose of immediate notification that the
buffer cannot take further input, and they will flush all at once when the
tty is restarted.

Signed-off-by: Joe Peterson <joe@skyrush.com>
Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Joe Peterson 2009-01-02 13:43:40 +00:00 • committed by Linus Torvalds
parent acc71bbad3
commit 7e94b1d9bf
1 changed files with 9 additions and 17 deletions

26
drivers/char/n_tty.c
View file

@ -872,7 +872,7 @@ static void eraser(unsigned char c, struct tty_struct *tty)
/* FIXME: locking needed ? */
if (tty->read_head == tty->canon_head) {
/* echo_char_raw('\a', tty); */ /* what do you think? */
/* process_output('\a', tty); */ /* what do you think? */
return;
}
if (c == ERASE_CHAR(tty))
@ -1148,10 +1148,8 @@ static inline void n_tty_receive_char(struct tty_struct *tty, unsigned char c)
parmrk = (c == (unsigned char) '\377' && I_PARMRK(tty)) ? 1 : 0;
if (tty->read_cnt >= (N_TTY_BUF_SIZE - parmrk - 1)) {
/* beep if no space */
if (L_ECHO(tty)) {
echo_char_raw('\a', tty);
process_echoes(tty);
}
if (L_ECHO(tty))
process_output('\a', tty);
return;
}
if (L_ECHO(tty)) {
@ -1255,10 +1253,8 @@ static inline void n_tty_receive_char(struct tty_struct *tty, unsigned char c)
}
if (c == '\n') {
if (tty->read_cnt >= N_TTY_BUF_SIZE) {
if (L_ECHO(tty)) {
echo_char_raw('\a', tty);
process_echoes(tty);
}
if (L_ECHO(tty))
process_output('\a', tty);
return;
}
if (L_ECHO(tty) || L_ECHONL(tty)) {
@ -1280,10 +1276,8 @@ static inline void n_tty_receive_char(struct tty_struct *tty, unsigned char c)
parmrk = (c == (unsigned char) '\377' && I_PARMRK(tty))
? 1 : 0;
if (tty->read_cnt >= (N_TTY_BUF_SIZE - parmrk)) {
if (L_ECHO(tty)) {
echo_char_raw('\a', tty);
process_echoes(tty);
}
if (L_ECHO(tty))
process_output('\a', tty);
return;
}
/*
@ -1320,10 +1314,8 @@ static inline void n_tty_receive_char(struct tty_struct *tty, unsigned char c)
parmrk = (c == (unsigned char) '\377' && I_PARMRK(tty)) ? 1 : 0;
if (tty->read_cnt >= (N_TTY_BUF_SIZE - parmrk - 1)) {
/* beep if no space */
if (L_ECHO(tty)) {
echo_char_raw('\a', tty);
process_echoes(tty);
}
if (L_ECHO(tty))
process_output('\a', tty);
return;
}
if (L_ECHO(tty)) {