1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{linux.intel,addtoit}.com) |
4 | */ |
5 | |
6 | #include <errno.h> |
7 | #include <fcntl.h> |
8 | #include <termios.h> |
9 | #include "chan_user.h" |
10 | #include <os.h> |
11 | #include <um_malloc.h> |
12 | |
13 | struct tty_chan { |
14 | char *dev; |
15 | int raw; |
16 | struct termios tt; |
17 | }; |
18 | |
19 | static void *tty_chan_init(char *str, int device, const struct chan_opts *opts) |
20 | { |
21 | struct tty_chan *data; |
22 | |
23 | if (*str != ':') { |
24 | printk(UM_KERN_ERR "tty_init : channel type 'tty' must specify " |
25 | "a device\n" ); |
26 | return NULL; |
27 | } |
28 | str++; |
29 | |
30 | data = uml_kmalloc(sizeof(*data), UM_GFP_KERNEL); |
31 | if (data == NULL) |
32 | return NULL; |
33 | *data = ((struct tty_chan) { .dev = str, |
34 | .raw = opts->raw }); |
35 | |
36 | return data; |
37 | } |
38 | |
39 | static int tty_open(int input, int output, int primary, void *d, |
40 | char **dev_out) |
41 | { |
42 | struct tty_chan *data = d; |
43 | int fd, err, mode = 0; |
44 | |
45 | if (input && output) |
46 | mode = O_RDWR; |
47 | else if (input) |
48 | mode = O_RDONLY; |
49 | else if (output) |
50 | mode = O_WRONLY; |
51 | |
52 | fd = open(data->dev, mode); |
53 | if (fd < 0) |
54 | return -errno; |
55 | |
56 | if (data->raw) { |
57 | CATCH_EINTR(err = tcgetattr(fd, &data->tt)); |
58 | if (err) |
59 | return err; |
60 | |
61 | err = raw(fd); |
62 | if (err) |
63 | return err; |
64 | } |
65 | |
66 | *dev_out = data->dev; |
67 | return fd; |
68 | } |
69 | |
70 | const struct chan_ops tty_ops = { |
71 | .type = "tty" , |
72 | .init = tty_chan_init, |
73 | .open = tty_open, |
74 | .close = generic_close, |
75 | .read = generic_read, |
76 | .write = generic_write, |
77 | .console_write = generic_console_write, |
78 | .window_size = generic_window_size, |
79 | .free = generic_free, |
80 | .winch = 0, |
81 | }; |
82 | |