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/*
Copyright (C) 1995 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 <fcntl.h>
#include "netfs.h"
#include "io_S.h"
error_t
netfs_S_io_readable (struct protid *user,
mach_msg_type_number_t *amount)
{
error_t err;
if (!user)
return EOPNOTSUPP;
if (!(user->po->openstat & O_READ))
return EINVAL;
mutex_lock (&user->po->np->lock);
err = netfs_validate_stat (user->po->np, user->credential);
if (!err)
{
if (user->po->np->nn_stat.st_size > user->po->filepointer)
*amount = user->po->np->nn_stat.st_size - user->po->filepointer;
else
*amount = 0;
}
mutex_unlock (&user->po->np->lock);
return err;
}
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