sysdeps/unix/sysv/linux/tcdrain.c

   1 /* Copyright (C) 1995-2014 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 <termios.h>
  20 #include <sys/ioctl.h>
  21 #include <sysdep-cancel.h>
  22
  23 /* Wait for pending output to be written on FD.  */
  24 int
  25 __libc_tcdrain (int fd)
  26 {
  27   if (SINGLE_THREAD_P)
  28     /* With an argument of 1, TCSBRK for output to be drain.  */
  29     return INLINE_SYSCALL (ioctl, 3, fd, TCSBRK, 1);
  30
  31   int oldtype = LIBC_CANCEL_ASYNC ();
  32
  33   /* With an argument of 1, TCSBRK for output to be drain.  */
  34   int result = INLINE_SYSCALL (ioctl, 3, fd, TCSBRK, 1);
  35
  36   LIBC_CANCEL_RESET (oldtype);
  37
  38   return result;
  39 }
  40 weak_alias (__libc_tcdrain, tcdrain)