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glibc  2.9
seekdir.c
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00001 /* Copyright (C) 1993, 94, 95, 96, 97, 99 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #include <errno.h>
00020 #include <stddef.h>
00021 #include <dirent.h>
00022 #include <unistd.h>
00023 #include "dirstream.h"
00024 
00025 /* Seek to position POS in DIRP.  */
00026 /* XXX should be __seekdir ? */
00027 void
00028 seekdir (dirp, pos)
00029      DIR *dirp;
00030      long int pos;
00031 {
00032   __libc_lock_lock (dirp->__lock);
00033   /* Change our entry index pointer to POS and discard any data already
00034      read.  The next `readdir' call will notice the empty block and read
00035      anew from the location in DIRP->__entry_ptr and reset the other state
00036      variables.  */
00037   dirp->__entry_ptr = pos;
00038   dirp->__size = 0;
00039   __libc_lock_unlock (dirp->__lock);
00040 }