Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Copyright (C) 2001 Jeff Dike (jdike@karaya.com) | |
3 | * Licensed under the GPL | |
4 | */ | |
5 | ||
6 | #include <stdio.h> | |
7 | #include <stdlib.h> | |
8 | #include <unistd.h> | |
9 | #include <termios.h> | |
10 | #include <errno.h> | |
11 | #include "user.h" | |
12 | #include "user_util.h" | |
13 | #include "chan_user.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, struct chan_opts *opts) | |
23 | { | |
24 | struct fd_chan *data; | |
25 | char *end; | |
26 | int n; | |
27 | ||
28 | if(*str != ':'){ | |
29 | printk("fd_init : channel type 'fd' must specify a file " | |
30 | "descriptor\n"); | |
31 | return(NULL); | |
32 | } | |
33 | str++; | |
34 | n = strtoul(str, &end, 0); | |
35 | if((*end != '\0') || (end == str)){ | |
36 | printk("fd_init : couldn't parse file descriptor '%s'\n", str); | |
37 | return(NULL); | |
38 | } | |
39 | data = um_kmalloc(sizeof(*data)); | |
40 | if(data == NULL) return(NULL); | |
41 | *data = ((struct fd_chan) { .fd = n, | |
42 | .raw = opts->raw }); | |
43 | return(data); | |
44 | } | |
45 | ||
46 | static int fd_open(int input, int output, int primary, void *d, char **dev_out) | |
47 | { | |
48 | struct fd_chan *data = d; | |
49 | int err; | |
50 | ||
51 | if(data->raw && isatty(data->fd)){ | |
52 | CATCH_EINTR(err = tcgetattr(data->fd, &data->tt)); | |
53 | if(err) | |
54 | return(err); | |
55 | ||
56 | err = raw(data->fd); | |
57 | if(err) | |
58 | return(err); | |
59 | } | |
60 | sprintf(data->str, "%d", data->fd); | |
61 | *dev_out = data->str; | |
62 | return(data->fd); | |
63 | } | |
64 | ||
65 | static void fd_close(int fd, void *d) | |
66 | { | |
67 | struct fd_chan *data = d; | |
68 | int err; | |
69 | ||
70 | if(data->raw && isatty(fd)){ | |
71 | CATCH_EINTR(err = tcsetattr(fd, TCSAFLUSH, &data->tt)); | |
72 | if(err) | |
73 | printk("Failed to restore terminal state - " | |
74 | "errno = %d\n", -err); | |
75 | data->raw = 0; | |
76 | } | |
77 | } | |
78 | ||
79 | static int fd_console_write(int fd, const char *buf, int n, void *d) | |
80 | { | |
81 | struct fd_chan *data = d; | |
82 | ||
83 | return(generic_console_write(fd, buf, n, &data->tt)); | |
84 | } | |
85 | ||
86 | struct chan_ops fd_ops = { | |
87 | .type = "fd", | |
88 | .init = fd_init, | |
89 | .open = fd_open, | |
90 | .close = fd_close, | |
91 | .read = generic_read, | |
92 | .write = generic_write, | |
93 | .console_write = fd_console_write, | |
94 | .window_size = generic_window_size, | |
95 | .free = generic_free, | |
96 | .winch = 1, | |
97 | }; | |
98 | ||
99 | /* | |
100 | * Overrides for Emacs so that we follow Linus's tabbing style. | |
101 | * Emacs will notice this stuff at the end of the file and automatically | |
102 | * adjust the settings for this buffer only. This must remain at the end | |
103 | * of the file. | |
104 | * --------------------------------------------------------------------------- | |
105 | * Local variables: | |
106 | * c-file-style: "linux" | |
107 | * End: | |
108 | */ |