sysdeps/unix/bsd/tcdrain.c

   1 /* Copyright (C) 1991 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 Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 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 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #include <ansidecl.h>
  20 #include <errno.h>
  21 #include <stddef.h>
  22 #include <termios.h>
  23 #include <unistd.h>
  24
  25 #include "bsdtty.h"
  26
  27 /* Wait for pending output to be written on FD.  */
  28 int
  29 DEFUN(tcdrain, (fd), int fd)
  30 {
  31   /* The TIOCSETP control waits for pending output to be written before
  32      affecting its changes, so we use that without changing anything.  */
  33   struct sgttyb b;
  34   if (__ioctl(fd, TIOCGETP, (PTR) &b) < 0 ||
  35       __ioctl(fd, TIOCSETP, (PTR) &b) < 0)
  36     return -1;
  37   return 0;
  38 }