1 files changed, 3 insertions, 1 deletions
diff --git a/i386/i386at/com.c b/i386/i386at/com.c
index e1ba71a..6edbca0 100644
--- a/i386/i386at/com.c
+++ b/i386/i386at/com.c
@@ -618,7 +618,7 @@ void
 comstart(tp)
 struct tty *tp;
 {
-	char nch;
+	int nch;
 #if 0
 	int i;
 #endif
@@ -654,6 +654,8 @@ comst_4++;
 	}
 #else
 	nch = getc(&tp->t_outq);
+	if (nch == -1)
+		return;
 	if ((nch & 0200) && ((tp->t_flags & LITOUT) == 0)) {
 	    timeout((timer_func_t *)ttrstrt, (char *)tp, (nch & 0x7f) + 6);
 	    tp->t_state |= TS_TIMEOUT;