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/arch/um/drivers/tty.c

http://github.com/mirrors/linux
C | 81 lines | 64 code | 13 blank | 4 comment | 14 complexity | 76f8459960d962f5afb33d20723e030a MD5 | raw file
 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
13struct tty_chan {
14	char *dev;
15	int raw;
16	struct termios tt;
17};
18
19static 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
39static 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
70const 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};