1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{linux.intel,addtoit}.com) |
4 | */ |
5 | |
6 | #include <stdio.h> |
7 | #include <stdlib.h> |
8 | #include <unistd.h> |
9 | #include <errno.h> |
10 | #include <termios.h> |
11 | #include "chan_user.h" |
12 | #include <os.h> |
13 | #include <um_malloc.h> |
14 | |
15 | struct fd_chan { |
16 | int fd; |
17 | int raw; |
18 | struct termios tt; |
19 | char str[sizeof("1234567890\0" )]; |
20 | }; |
21 | |
22 | static void *fd_init(char *str, int device, const struct chan_opts *opts) |
23 | { |
24 | struct fd_chan *data; |
25 | char *end; |
26 | int n; |
27 | |
28 | if (*str != ':') { |
29 | printk(UM_KERN_ERR "fd_init : channel type 'fd' must specify a " |
30 | "file descriptor\n" ); |
31 | return NULL; |
32 | } |
33 | str++; |
34 | n = strtoul(str, &end, 0); |
35 | if ((*end != '\0') || (end == str)) { |
36 | printk(UM_KERN_ERR "fd_init : couldn't parse file descriptor " |
37 | "'%s'\n" , str); |
38 | return NULL; |
39 | } |
40 | |
41 | data = uml_kmalloc(sizeof(*data), UM_GFP_KERNEL); |
42 | if (data == NULL) |
43 | return NULL; |
44 | |
45 | *data = ((struct fd_chan) { .fd = n, |
46 | .raw = opts->raw }); |
47 | return data; |
48 | } |
49 | |
50 | static int fd_open(int input, int output, int primary, void *d, char **dev_out) |
51 | { |
52 | struct fd_chan *data = d; |
53 | int err; |
54 | |
55 | if (data->raw && isatty(data->fd)) { |
56 | CATCH_EINTR(err = tcgetattr(data->fd, &data->tt)); |
57 | if (err) |
58 | return err; |
59 | |
60 | err = raw(data->fd); |
61 | if (err) |
62 | return err; |
63 | } |
64 | sprintf(data->str, "%d" , data->fd); |
65 | *dev_out = data->str; |
66 | return data->fd; |
67 | } |
68 | |
69 | static void fd_close(int fd, void *d) |
70 | { |
71 | struct fd_chan *data = d; |
72 | int err; |
73 | |
74 | if (!data->raw || !isatty(fd)) |
75 | return; |
76 | |
77 | CATCH_EINTR(err = tcsetattr(fd, TCSAFLUSH, &data->tt)); |
78 | if (err) |
79 | printk(UM_KERN_ERR "Failed to restore terminal state - " |
80 | "errno = %d\n" , -err); |
81 | data->raw = 0; |
82 | } |
83 | |
84 | const struct chan_ops fd_ops = { |
85 | .type = "fd" , |
86 | .init = fd_init, |
87 | .open = fd_open, |
88 | .close = fd_close, |
89 | .read = generic_read, |
90 | .write = generic_write, |
91 | .console_write = generic_console_write, |
92 | .window_size = generic_window_size, |
93 | .free = generic_free, |
94 | .winch = 1, |
95 | }; |
96 | |