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) return(fd);
49 if(data->raw){
50 CATCH_EINTR(err = tcgetattr(fd, &data->tt));
51 if(err)
52 return(err);
53
54 err = raw(fd);
55 if(err)
56 return(err);
57 }
58
59 *dev_out = data->dev;
60 return(fd);
61}
62
63static int tty_console_write(int fd, const char *buf, int n, void *d)
64{
65 struct tty_chan *data = d;
66
67 return(generic_console_write(fd, buf, n, &data->tt));
68}
69
70struct 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 = tty_console_write,
78 .window_size = generic_window_size,
79 .free = generic_free,
80 .winch = 0,
81};
82
83/*
84 * Overrides for Emacs so that we follow Linus's tabbing style.
85 * Emacs will notice this stuff at the end of the file and automatically
86 * adjust the settings for this buffer only. This must remain at the end
87 * of the file.
88 * ---------------------------------------------------------------------------
89 * Local variables:
90 * c-file-style: "linux"
91 * End:
92 */