Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/*
2 * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
3 * Licensed under the GPL
4 */
5
6#include <stdlib.h>
7#include <errno.h>
8#include "chan_user.h"
9#include "os.h"
10
11/* This address is used only as a unique identifer */
12static int null_chan;
13
14static void *null_init(char *str, int device, const struct chan_opts *opts)
15{
16 return(&null_chan);
17}
18
19static int null_open(int input, int output, int primary, void *d,
20 char **dev_out)
21{
22 *dev_out = NULL;
23 return(os_open_file(DEV_NULL, of_rdwr(OPENFLAGS()), 0));
24}
25
26static int null_read(int fd, char *c_out, void *unused)
27{
28 return(-ENODEV);
29}
30
31static void null_free(void *data)
32{
33}
34
35const struct chan_ops null_ops = {
36 .type = "null",
37 .init = null_init,
38 .open = null_open,
39 .close = generic_close,
40 .read = null_read,
41 .write = generic_write,
42 .console_write = generic_console_write,
43 .window_size = generic_window_size,
44 .free = null_free,
45 .winch = 0,
46};
47
48/*
49 * Overrides for Emacs so that we follow Linus's tabbing style.
50 * Emacs will notice this stuff at the end of the file and automatically
51 * adjust the settings for this buffer only. This must remain at the end
52 * of the file.
53 * ---------------------------------------------------------------------------
54 * Local variables:
55 * c-file-style: "linux"
56 * End:
57 */