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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 "kern_constants.h"
#include "os.h"
#include "um_malloc.h"
#include "user.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 = 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,
};
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