blob: a21e3426cd284e278257675ac52ffe9b80d39aec (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
|
/*
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;
}
|
