svn commit: r318726 - stable/11/usr.bin/resizewin

[Edward Tomasz Napierala]

Author: trasz
Date: Tue May 23 08:04:36 2017
New Revision: 318726
URL: https://svnweb.freebsd.org/changeset/base/318726

Log:
  MFC r317909:
  
  Make resizewin(1) discard the terminal queues, to lower the chance
  for "unable to parse response" error which happens when youre typing
  too fast for the machine you're running it on.

Modified:
  stable/11/usr.bin/resizewin/resizewin.c
Directory Properties:
  stable/11/   (props changed)

Modified: stable/11/usr.bin/resizewin/resizewin.c
==============================================================================
--- stable/11/usr.bin/resizewin/resizewin.c	Tue May 23 08:02:21 2017	(r318725)
+++ stable/11/usr.bin/resizewin/resizewin.c	Tue May 23 08:04:36 2017	(r318726)
@@ -52,7 +52,7 @@ main(__unused int argc, __unused char **
 {
 	struct termios old, new;
 	struct winsize w;
-	int ret, fd, cnt, error;
+	int ret, fd, cnt, error, what;
 	char data[20];
 	struct timeval then, now;
 
@@ -71,6 +71,12 @@ main(__unused int argc, __unused char **
 	if (tcsetattr(fd, TCSANOW, &new) == -1)
 		exit(1);
 
+	/* Discard input received so far */
+	what = FREAD | FWRITE;
+	error = ioctl(fd, TIOCFLUSH, &what);
+	if (error != 0)
+		warn("ioctl");
+
 	if (write(fd, query, sizeof(query)) != sizeof(query)) {
 		error = 1;
 		goto out;