libio/__fsetlocking.c

   1 /* Copyright (C) 2000, 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 <stdio_ext.h>
  20
  21 #undef __fsetlocking
  22
  23 int
  24 __fsetlocking (FILE *fp, int type)
  25 {
  26   int result = ((fp->_flags & _IO_USER_LOCK)
  27                 ? FSETLOCKING_BYCALLER : FSETLOCKING_INTERNAL);
  28
  29   if (type != FSETLOCKING_QUERY)
  30     {
  31       fp->_flags &= ~_IO_USER_LOCK;
  32       if (type == FSETLOCKING_BYCALLER)
  33          fp->_flags |= _IO_USER_LOCK;
  34     }
  35
  36   return result;
  37 }
  38 INTDEF(__fsetlocking)