| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |