/* Copyright (C) 1991-2018 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 Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 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

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#include <errno.h>

#include <stddef.h>

#include <termios.h>

#include <unistd.h>

#include "bsdtty.h"

#include <sys/file.h>

/* Flush pending data on FD.  */

int

tcflush (int fd, int queue_selector)

{

  int arg;

  switch (queue_selector)

    {

    case TCIFLUSH:

      arg = FREAD;

      break;

    case TCOFLUSH:

      arg = FWRITE;

      break;

    case TCIOFLUSH:

      arg = FREAD | FWRITE;

      break;

    default:

      __set_errno (EINVAL);

      return -1;

    }

  return __ioctl (fd, TIOCFLUSH, (void *) &arg;;

}