tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Copyright (C) 2001 Jeff Dike (jdike@karaya.com)
3 * Licensed under the GPL
4 */
5
6#include <stdio.h>
7#include <termios.h>
8#include <errno.h>
9#include <unistd.h>
10#include "chan_user.h"
11#include "user_util.h"
12#include "user.h"
13#include "os.h"
14
15struct tty_chan {
16 char *dev;
17 int raw;
18 struct termios tt;
19};
20
21static void *tty_chan_init(char *str, int device, struct chan_opts *opts)
22{
23 struct tty_chan *data;
24
25 if(*str != ':'){
26 printk("tty_init : channel type 'tty' must specify "
27 "a device\n");
28 return NULL;
29 }
30 str++;
31
32 data = um_kmalloc(sizeof(*data));
33 if(data == NULL)
34 return NULL;
35 *data = ((struct tty_chan) { .dev = str,
36 .raw = opts->raw });
37
38 return data;
39}
40
41static int tty_open(int input, int output, int primary, void *d,
42 char **dev_out)
43{
44 struct tty_chan *data = d;
45 int fd, err;
46
47 fd = os_open_file(data->dev, of_set_rw(OPENFLAGS(), input, output), 0);
48 if(fd < 0)
49 return fd;
50
51 if(data->raw){
52 CATCH_EINTR(err = tcgetattr(fd, &data->tt));
53 if(err)
54 return err;
55
56 err = raw(fd);
57 if(err)
58 return err;
59 }
60
61 *dev_out = data->dev;
62 return fd;
63}
64
65struct chan_ops tty_ops = {
66 .type = "tty",
67 .init = tty_chan_init,
68 .open = tty_open,
69 .close = generic_close,
70 .read = generic_read,
71 .write = generic_write,
72 .console_write = generic_console_write,
73 .window_size = generic_window_size,
74 .free = generic_free,
75 .winch = 0,
76};