sysdeps/mach/hurd/seekdir.c

   1 /* Copyright (C) 1993, 1994, 1995, 1996, 1997 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 Library General Public License as
   6    published by the Free Software Foundation; either version 2 of the
   7    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    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, USA.  */
  18
  19 #include <errno.h>
  20 #include <stddef.h>
  21 #include <dirent.h>
  22 #include <unistd.h>
  23 #include "dirstream.h"
  24
  25 /* Seek to position POS in DIRP.  */
  26 /* XXX should be __seekdir ? */
  27 void
  28 seekdir (dirp, pos)
  29      DIR *dirp;
  30      __off_t pos;
  31 {
  32   __libc_lock_lock (dirp->__lock);
  33   /* Change our entry index pointer to POS and discard any data already
  34      read.  The next `readdir' call will notice the empty block and read
  35      anew from the location in DIRP->__entry_ptr and reset the other state
  36      variables.  */
  37   dirp->__entry_ptr = pos;
  38   dirp->__size = 0;
  39   __libc_lock_unlock (dirp->__lock);
  40 }