Make resizewin(1) do flushing by using TCSAFLUSH instead of TCSANOW

followed by tcflush(3).  This works just as well and is more elegant.

Suggested by:	bde
MFC after:	2 weeks
Sponsored by:	DARPA, AFRL

1 files changed, 2 insertions, 7 deletions

diff --git a/usr.bin/resizewin/resizewin.c b/usr.bin/resizewin/resizewin.c
index d86189ffe7283..42290faf33aa6 100644
--- a/usr.bin/resizewin/resizewin.c
+++ b/usr.bin/resizewin/resizewin.c
@@ -91,21 +91,16 @@ main(int argc, char **argv)
 			exit(0);
 	}
 
-	/* Disable echo */
+	/* Disable echo, drain the input, and flush the output */
 	if (tcgetattr(fd, &old) == -1)
 		exit(1);
 
 	new = old;
 	new.c_cflag |= (CLOCAL | CREAD);
 	new.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);
-	if (tcsetattr(fd, TCSANOW, &new) == -1)
+	if (tcsetattr(fd, TCSAFLUSH, &new) == -1)
 		exit(1);
 
-	/* Discard input received so far */
-	error = tcflush(fd, TCIOFLUSH);
-	if (error != 0)
-		warn("tcflush");
-
 	if (write(fd, query, sizeof(query)) != sizeof(query)) {
 		error = 1;
 		goto out;