sysdeps/unix/sysv/linux/tcdrain.c

   1 /* Copyright (C) 1995, 1996, 1997, 2002 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 <termios.h>
  21 #include <sys/ioctl.h>
  22 #include <sysdep-cancel.h>
  23
  24 /* Wait for pending output to be written on FD.  */
  25 int
  26 __libc_tcdrain (int fd)
  27 {
  28   if (SINGLE_THREAD_P)
  29     /* With an argument of 1, TCSBRK for output to be drain.  */
  30     return INLINE_SYSCALL (ioctl, 3, fd, TCSBRK, 1);
  31
  32   int oldtype = LIBC_CANCEL_ASYNC ();
  33
  34   /* With an argument of 1, TCSBRK for output to be drain.  */
  35   int result = INLINE_SYSCALL (ioctl, 3, fd, TCSBRK, 1);
  36
  37   LIBC_CANCEL_RESET (oldtype);
  38
  39   return result;
  40 }
  41 weak_alias (__libc_tcdrain, tcdrain)