<?php

declare(strict_types=1);

namespace Swoole\Coroutine;

class System
{
    /**
     * @param mixed $domain_name
     * @param mixed|null $family
     * @param mixed|null $timeout
     * @return mixed
     */
    public static function gethostbyname($domain_name, $family = null, $timeout = null)
    {
    }

    /**
     * @param mixed $domain_name
     * @param mixed|null $timeout
     * @param mixed|null $type
     * @return mixed
     */
    public static function dnsLookup($domain_name, $timeout = null, $type = null)
    {
    }

    /**
     * @param mixed $command
     * @param mixed|null $get_error_stream
     * @return mixed
     */
    public static function exec($command, $get_error_stream = null)
    {
    }

    /**
     * @param mixed $seconds
     * @return mixed
     */
    public static function sleep($seconds)
    {
    }

    /**
     * @param mixed $hostname
     * @param mixed|null $family
     * @param mixed|null $socktype
     * @param mixed|null $protocol
     * @param mixed|null $service
     * @param mixed|null $timeout
     * @return mixed
     */
    public static function getaddrinfo($hostname, $family = null, $socktype = null, $protocol = null, $service = null, $timeout = null)
    {
    }

    /**
     * @param mixed $path
     * @return mixed
     */
    public static function statvfs($path)
    {
    }

    /**
     * @param mixed $filename
     * @return mixed
     */
    public static function readFile($filename)
    {
    }

    /**
     * @param mixed $filename
     * @param mixed $data
     * @param mixed|null $flags
     * @return mixed
     */
    public static function writeFile($filename, $data, $flags = null)
    {
    }

    /**
     * @param mixed|null $timeout
     * @return mixed
     */
    public static function wait($timeout = null)
    {
    }

    /**
     * @param mixed $pid
     * @param mixed|null $timeout
     * @return mixed
     */
    public static function waitPid($pid, $timeout = null)
    {
    }

    /**
     * @param mixed $signo
     * @param mixed|null $timeout
     * @return mixed
     */
    public static function waitSignal($signo, $timeout = null)
    {
    }

    /**
     * @param mixed $fd
     * @param mixed|null $events
     * @param mixed|null $timeout
     * @return mixed
     */
    public static function waitEvent($fd, $events = null, $timeout = null)
    {
    }

    /**
     * @param mixed $handle
     * @param mixed|null $length
     * @return mixed
     */
    public static function fread($handle, $length = null)
    {
    }

    /**
     * @param mixed $handle
     * @param mixed $string
     * @param mixed|null $length
     * @return mixed
     */
    public static function fwrite($handle, $string, $length = null)
    {
    }

    /**
     * @param mixed $handle
     * @return mixed
     */
    public static function fgets($handle)
    {
    }
}
