// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{linux.intel,addtoit}.com)
 */

#include <stddef.h>
#include <errno.h>
#include <fcntl.h>
#include "chan_user.h"
#include <os.h>

/* This address is used only as a unique identifier */
static int null_chan;

static void *null_init(char *str, int device, const struct chan_opts *opts)
{
        return &null_chan;
}

static int null_open(int input, int output, int primary, void *d,
                     char **dev_out)
{
        int fd;

        *dev_out = NULL;

        fd = open(DEV_NULL, O_RDWR);
        return (fd < 0) ? -errno : fd;
}

static int null_read(int fd, __u8 *c_out, void *unused)
{
        return -ENODEV;
}

static void null_free(void *data)
{
}

const struct chan_ops null_ops = {
        .type           = "null",
        .init           = null_init,
        .open           = null_open,
        .close          = generic_close,
        .read           = null_read,
        .write          = generic_write,
        .console_write  = generic_console_write,
        .window_size    = generic_window_size,
        .free           = null_free,
        .winch          = 0,
};