libio/__fsetlocking.c

   1 /* Copyright (C) 2000-2023 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    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <stdio_ext.h>
  19
  20 #undef __fsetlocking
  21
  22 int
  23 __fsetlocking (FILE *fp, int type)
  24 {
  25   int result = ((fp->_flags & _IO_USER_LOCK)
  26                 ? FSETLOCKING_BYCALLER : FSETLOCKING_INTERNAL);
  27
  28   if (type != FSETLOCKING_QUERY)
  29     {
  30       fp->_flags &= ~_IO_USER_LOCK;
  31       if (type == FSETLOCKING_BYCALLER)
  32          fp->_flags |= _IO_USER_LOCK;
  33     }
  34
  35   return result;
  36 }
  37 libc_hidden_def (__fsetlocking)