iPXE
nullnet.c
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1 /*
2  * Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>.
3  *
4  * This program is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU General Public License as
6  * published by the Free Software Foundation; either version 2 of the
7  * License, or any later version.
8  *
9  * This program is distributed in the hope that it will be useful, but
10  * WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License
15  * along with this program; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
17  * 02110-1301, USA.
18  *
19  * You can also choose to distribute this program under the terms of
20  * the Unmodified Binary Distribution Licence (as given in the file
21  * COPYING.UBDL), provided that you have satisfied its requirements.
22  */
23 
24 FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
25 
26 #include <stdint.h>
27 #include <errno.h>
28 #include <ipxe/iobuf.h>
29 #include <ipxe/netdevice.h>
30 
31 /** @file
32  *
33  * Null network device
34  *
35  */
36 
37 static int null_open ( struct net_device *netdev __unused ) {
38  return -ENODEV;
39 };
40 
41 static void null_close ( struct net_device *netdev __unused ) {
42  /* Do nothing */
43 };
44 
45 static int null_transmit ( struct net_device *netdev __unused,
46  struct io_buffer *iobuf __unused ) {
47  return -ENODEV;
48 };
49 
50 static void null_poll ( struct net_device *netdev __unused ) {
51  /* Do nothing */
52 }
53 
54 static void null_irq ( struct net_device *netdev __unused,
55  int enable __unused ) {
56  /* Do nothing */
57 }
58 
60  .open = null_open,
61  .close = null_close,
62  .transmit = null_transmit,
63  .poll = null_poll,
64  .irq = null_irq,
65 };
int(* open)(struct net_device *netdev)
Open network device.
Definition: netdevice.h:222
Error codes.
I/O buffers.
FILE_LICENCE(GPL2_OR_LATER_OR_UBDL)
static void null_poll(struct net_device *netdev __unused)
Definition: nullnet.c:50
static struct net_device * netdev
Definition: gdbudp.c:52
static int null_transmit(struct net_device *netdev __unused, struct io_buffer *iobuf __unused)
Definition: nullnet.c:45
static int null_open(struct net_device *netdev __unused)
Definition: nullnet.c:37
A network device.
Definition: netdevice.h:348
#define ENODEV
No such device.
Definition: errno.h:509
static void null_irq(struct net_device *netdev __unused, int enable __unused)
Definition: nullnet.c:54
static void null_close(struct net_device *netdev __unused)
Definition: nullnet.c:41
Network device operations.
Definition: netdevice.h:213
Network device management.
#define __unused
Declare a variable or data structure as unused.
Definition: compiler.h:573
struct net_device_operations null_netdev_operations
Definition: nullnet.c:59
A persistent I/O buffer.
Definition: iobuf.h:32