sysdeps/unix/bsd/tcflush.c

   1 /* Copyright (C) 1991, 1992, 1996, 1997 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, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <errno.h>
  20 #include <stddef.h>
  21 #include <termios.h>
  22 #include <unistd.h>
  23 #include "bsdtty.h"
  24 #include <sys/file.h>
  25
  26 /* Flush pending data on FD.  */
  27 int
  28 tcflush (fd, queue_selector)
  29      int fd;
  30      int queue_selector;
  31 {
  32   int arg;
  33
  34   switch (queue_selector)
  35     {
  36     case TCIFLUSH:
  37       arg = FREAD;
  38       break;
  39     case TCOFLUSH:
  40       arg = FWRITE;
  41       break;
  42     case TCIOFLUSH:
  43       arg = FREAD | FWRITE;
  44       break;
  45     default:
  46       __set_errno (EINVAL);
  47       return -1;
  48     }
  49
  50   return __ioctl (fd, TIOCFLUSH, (void *) &arg);
  51 }