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| /*
| * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{linux.intel,addtoit}.com)
| * Licensed under the GPL
| */
|
| #include <stdio.h>
| #include <stdlib.h>
| #include <unistd.h>
| #include <errno.h>
| #include <termios.h>
| #include "chan_user.h"
| #include <os.h>
| #include <um_malloc.h>
|
| struct fd_chan {
| int fd;
| int raw;
| struct termios tt;
| char str[sizeof("1234567890\0")];
| };
|
| static void *fd_init(char *str, int device, const struct chan_opts *opts)
| {
| struct fd_chan *data;
| char *end;
| int n;
|
| if (*str != ':') {
| printk(UM_KERN_ERR "fd_init : channel type 'fd' must specify a "
| "file descriptor\n");
| return NULL;
| }
| str++;
| n = strtoul(str, &end, 0);
| if ((*end != '\0') || (end == str)) {
| printk(UM_KERN_ERR "fd_init : couldn't parse file descriptor "
| "'%s'\n", str);
| return NULL;
| }
|
| data = uml_kmalloc(sizeof(*data), UM_GFP_KERNEL);
| if (data == NULL)
| return NULL;
|
| *data = ((struct fd_chan) { .fd = n,
| .raw = opts->raw });
| return data;
| }
|
| static int fd_open(int input, int output, int primary, void *d, char **dev_out)
| {
| struct fd_chan *data = d;
| int err;
|
| if (data->raw && isatty(data->fd)) {
| CATCH_EINTR(err = tcgetattr(data->fd, &data->tt));
| if (err)
| return err;
|
| err = raw(data->fd);
| if (err)
| return err;
| }
| sprintf(data->str, "%d", data->fd);
| *dev_out = data->str;
| return data->fd;
| }
|
| static void fd_close(int fd, void *d)
| {
| struct fd_chan *data = d;
| int err;
|
| if (!data->raw || !isatty(fd))
| return;
|
| CATCH_EINTR(err = tcsetattr(fd, TCSAFLUSH, &data->tt));
| if (err)
| printk(UM_KERN_ERR "Failed to restore terminal state - "
| "errno = %d\n", -err);
| data->raw = 0;
| }
|
| const struct chan_ops fd_ops = {
| .type = "fd",
| .init = fd_init,
| .open = fd_open,
| .close = fd_close,
| .read = generic_read,
| .write = generic_write,
| .console_write = generic_console_write,
| .window_size = generic_window_size,
| .free = generic_free,
| .winch = 1,
| };
|
|
