// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2016 Anton Ivanov (aivanov@brocade.com)
 * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
 * Copyright (C) 2001 Ridgerun,Inc (glonnon@ridgerun.com)
 */

#include <stddef.h>
#include <unistd.h>
#include <errno.h>
#include <sched.h>
#include <signal.h>
#include <string.h>
#include <netinet/in.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <sys/mman.h>
#include <sys/param.h>
#include <endian.h>
#include <byteswap.h>

#include "ubd.h"
#include <os.h>
#include <poll.h>

static struct pollfd kernel_pollfd;

int start_io_thread(struct os_helper_thread **td_out, int *fd_out)
{
        int fds[2], err;

        err = os_pipe(fds, 1, 1);
        if(err < 0){
                printk("start_io_thread - os_pipe failed, err = %d\n", -err);
                goto out;
        }

        kernel_fd = fds[0];
        kernel_pollfd.fd = kernel_fd;
        kernel_pollfd.events = POLLIN;
        *fd_out = fds[1];

        err = os_set_fd_block(*fd_out, 0);
        err |= os_set_fd_block(kernel_fd, 0);
        if (err) {
                printk("start_io_thread - failed to set nonblocking I/O.\n");
                goto out_close;
        }

        err = os_run_helper_thread(td_out, io_thread, NULL);
        if (err < 0) {
                printk("%s - failed to run helper thread, err = %d\n",
                       __func__, -err);
                goto out_close;
        }

        return 0;

 out_close:
        os_close_file(fds[0]);
        os_close_file(fds[1]);
        kernel_fd = -1;
        *fd_out = -1;
 out:
        return err;
}

int ubd_read_poll(int timeout)
{
        kernel_pollfd.events = POLLIN;
        return poll(&kernel_pollfd, 1, timeout);
}
int ubd_write_poll(int timeout)
{
        kernel_pollfd.events = POLLOUT;
        return poll(&kernel_pollfd, 1, timeout);
}