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/*
Copyright (C) 1994, 1995, 1996 Free Software Foundation
This program 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.
This program 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include "priv.h"
#include "io_S.h"
#include <fcntl.h>
/* Implement io_readable as described in <hurd/io.defs>. */
kern_return_t
diskfs_S_io_readable (struct protid *cred,
mach_msg_type_number_t *amount)
{
struct node *np;
if (!cred)
return EOPNOTSUPP;
if (!(cred->po->openstat & O_READ))
return EINVAL;
np = cred->po->np;
pthread_mutex_lock (&np->lock);
iohelp_get_conch (&np->conch);
if (np->dn_stat.st_size > cred->po->filepointer)
*amount = np->dn_stat.st_size - cred->po->filepointer;
else
*amount = 0;
pthread_mutex_unlock (&np->lock);
return 0;
}
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