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
49
50
51
| // SPDX-License-Identifier: GPL-2.0
| /*
| * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{linux.intel,addtoit}.com)
| */
|
| #include <stddef.h>
| #include <errno.h>
| #include <fcntl.h>
| #include "chan_user.h"
| #include <os.h>
|
| /* This address is used only as a unique identifier */
| static int null_chan;
|
| static void *null_init(char *str, int device, const struct chan_opts *opts)
| {
| return &null_chan;
| }
|
| static int null_open(int input, int output, int primary, void *d,
| char **dev_out)
| {
| int fd;
|
| *dev_out = NULL;
|
| fd = open(DEV_NULL, O_RDWR);
| return (fd < 0) ? -errno : fd;
| }
|
| static int null_read(int fd, char *c_out, void *unused)
| {
| return -ENODEV;
| }
|
| static void null_free(void *data)
| {
| }
|
| const struct chan_ops null_ops = {
| .type = "null",
| .init = null_init,
| .open = null_open,
| .close = generic_close,
| .read = null_read,
| .write = generic_write,
| .console_write = generic_console_write,
| .window_size = generic_window_size,
| .free = null_free,
| .winch = 0,
| };
|
|
