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/*
Copyright (C) 1995, 1996, 2000, 2006 Free Software Foundation, Inc.
Written by Michael I. Bushnell, p/BSG.
This file is part of the GNU Hurd.
The GNU Hurd is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2, or (at
your option) any later version.
The GNU Hurd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA. */
#include <unistd.h>
#include "netfs.h"
#include "io_S.h"
error_t
netfs_S_io_seek (struct protid *user,
off_t offset,
int whence,
off_t *newoffset)
{
error_t err = 0;
if (!user)
return EOPNOTSUPP;
switch (whence)
{
case SEEK_CUR:
offset += user->po->filepointer;
goto check;
case SEEK_END:
{
struct node *np;
np = user->po->np;
pthread_mutex_lock (&np->lock);
err = netfs_validate_stat (np, user->user);
if (!err)
offset += np->nn_stat.st_size;
pthread_mutex_unlock (&np->lock);
}
case SEEK_SET:
check:
if (offset >= 0)
{
*newoffset = user->po->filepointer = offset;
break;
}
default:
err = EINVAL;
break;
}
return err;
}
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