sysdeps/unix/bsd/tcflush.c

   1 /* Copyright (C) 1991-2014 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <stddef.h>
  20 #include <termios.h>
  21 #include <unistd.h>
  22 #include "bsdtty.h"
  23 #include <sys/file.h>
  24
  25 /* Flush pending data on FD.  */
  26 int
  27 tcflush (fd, queue_selector)
  28      int fd;
  29      int queue_selector;
  30 {
  31   int arg;
  32
  33   switch (queue_selector)
  34     {
  35     case TCIFLUSH:
  36       arg = FREAD;
  37       break;
  38     case TCOFLUSH:
  39       arg = FWRITE;
  40       break;
  41     case TCIOFLUSH:
  42       arg = FREAD | FWRITE;
  43       break;
  44     default:
  45       __set_errno (EINVAL);
  46       return -1;
  47     }
  48
  49   return __ioctl (fd, TIOCFLUSH, (void *) &arg);
  50 }