sysdeps/unix/bsd/tcdrain.c

   1 /* Copyright (C) 1991, 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, 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
  23 #include "bsdtty.h"
  24
  25 /* Wait for pending output to be written on FD.  */
  26 int
  27 __libc_tcdrain (int fd)
  28 {
  29   /* The TIOCSETP control waits for pending output to be written before
  30      affecting its changes, so we use that without changing anything.  */
  31   struct sgttyb b;
  32   if (__ioctl (fd, TIOCGETP, (void *) &b) < 0 ||
  33       __ioctl (fd, TIOCSETP, (void *) &b) < 0)
  34     return -1;
  35   return 0;
  36 }
  37 weak_alias (__libc_tcdrain, tcdrain)