diff options
Diffstat (limited to 'sys/kern/tty.c')
| -rw-r--r-- | sys/kern/tty.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/sys/kern/tty.c b/sys/kern/tty.c index e12779631c4..c31ce53cb65 100644 --- a/sys/kern/tty.c +++ b/sys/kern/tty.c @@ -1,4 +1,4 @@ -/* $OpenBSD: tty.c,v 1.78 2008/11/11 15:33:02 deraadt Exp $ */ +/* $OpenBSD: tty.c,v 1.79 2008/12/24 11:20:31 kettenis Exp $ */ /* $NetBSD: tty.c,v 1.68.4.2 1996/06/06 16:04:52 thorpej Exp $ */ /*- @@ -1147,9 +1147,13 @@ filt_ttywrite(struct knote *kn, long hint) { dev_t dev = (dev_t)((u_long)kn->kn_hook); struct tty *tp = (*cdevsw[major(dev)].d_tty)(dev); + int canwrite, s; - kn->kn_data = tp->t_outq.c_cc; - return (kn->kn_data <= tp->t_lowat); + s = spltty(); + kn->kn_data = tp->t_outq.c_cn - tp->t_outq.c_cc; + canwrite = (tp->t_outq.c_cc <= tp->t_lowat); + splx(s); + return (canwrite); } static int |