stdio/__fsetlocking.c

   1 /* Copyright (C) 2001 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 #include <errno.h>
  21 #include <stdlib.h>
  22
  23 int
  24 __fsetlocking (FILE *fp, int type)
  25 {
  26   /* We don't really support locking.  */
  27
  28   switch (type)
  29     {
  30     case FSETLOCKING_QUERY:
  31     case FSETLOCKING_BYCALLER:
  32       break;
  33     case FSETLOCKING_INTERNAL:
  34       abort ();
  35     default:
  36       __set_errno (EINVAL);
  37       return -1;
  38     }
  39
  40   return FSETLOCKING_BYCALLER;
  41 }