1 files changed, 38 insertions, 0 deletions
diff --git a/sysdeps/unix/bsd/tcdrain.c b/sysdeps/unix/bsd/tcdrain.c
new file mode 100644
index 0000000000..c9ed18d4f8
--- /dev/null
+++ b/sysdeps/unix/bsd/tcdrain.c
@@ -0,0 +1,38 @@
+/* Copyright (C) 1991 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version.
+
+The GNU C Library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB.  If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+#include <ansidecl.h>
+#include <errno.h>
+#include <stddef.h>
+#include <termios.h>
+#include <unistd.h>
+
+#include "bsdtty.h"
+
+/* Wait for pending output to be written on FD.  */
+int
+DEFUN(tcdrain, (fd), int fd)
+{
+  /* The TIOCSETP control waits for pending output to be written before
+     affecting its changes, so we use that without changing anything.  */
+  struct sgttyb b;
+  if (__ioctl(fd, TIOCGETP, (PTR) &b) < 0 ||
+      __ioctl(fd, TIOCSETP, (PTR) &b) < 0)
+    return -1;
+  return 0;
+}