sysdeps/mach/hurd/seekdir.c

   1 /* Copyright (C) 1993-2019 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    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <stddef.h>
  20 #include <dirent.h>
  21 #include <unistd.h>
  22 #include "dirstream.h"
  23
  24 /* Seek to position POS in DIRP.  */
  25 void
  26 __seekdir (DIR *dirp, long int pos)
  27 {
  28   __libc_lock_lock (dirp->__lock);
  29   /* Change our entry index pointer to POS and discard any data already
  30      read.  The next `readdir' call will notice the empty block and read
  31      anew from the location in DIRP->__entry_ptr and reset the other state
  32      variables.  */
  33   dirp->__entry_ptr = pos;
  34   dirp->__size = 0;
  35   __libc_lock_unlock (dirp->__lock);
  36 }
  37
  38 weak_alias (__seekdir, seekdir)