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java c监听服务器端口获取数据 java监听多个端口

最近在看nginx设计原理时思考到两个问题,便是:

  • 多个进程能否监听同个端口?
  • 单个进程能否监听多个端口?

当然随着学习的深入,答案均是肯定的,在这个过程中笔者为了验证,用php写了两个例子,在这里分享出来,供有需要的php同学学习跟理解。

在分享例子之前,需要先介绍两个php在socket编程中常用的扩展,pcntl和libevent:

1. pcntl

php本身并不支持多进程,但通过扩展pcntl便可以实现fork功能,fork编程的大概原理是,每次调用fork函数,操作系统就会产生一个子进程,儿子进程所有的堆栈信息都是原封不动复制父进程的,而在fork之后,父进程与子进程实际上是相互独立的,父子进程不会相互影响。也就是说,fork调用位置之前的所有变量,父进程和子进程是一样的,但fork之后则取决于各自的动作,且数据也是独立的;因为数据已经完整的复制给了子进程。而唯一能够区分父子进程的方法就是判断fork的返回值。如果为0,表示是子进程,如果为正数,表示为父进程,且该正数为子进程的PID(进程号),而如果是-1,表示子进程创建失败。

2. libevent

linux网络编程中有三大事件处理,IO(socket)、信号和定时器,理解并处理好这三者,linux网络编程就理解了一半,而libevent则是对这三者处理提供了一个很好的封装,大大简化了socket编程中事件处理的难度,非常推荐对这块感兴趣的同学去深入学习。

一、多个进程监听同个端口

<?php

/**
* 
*/
class Server
{
    protected $ip = '127.0.0.1';
    protected $port = 5000;
    protected $sock = null;

    public function main()
    {
        if(($this->sock = socket_create(AF_INET,SOCK_STREAM,SOL_TCP)) < 0) {
            echo "socket_create() 失败的原因是:".socket_strerror($sock)."\n";
            return ;
        }

        if(($ret = socket_bind($this->sock,$this->ip,$this->port)) < 0) {
            echo "socket_bind() 失败的原因是:".socket_strerror($ret)."\n";
            return ;
        }

        if(($ret = socket_listen($this->sock,4)) < 0) {
            echo "socket_listen() 失败的原因是:".socket_strerror($ret)."\n";
            return ;
        }

        for ($i=0; $i<3; $i++)
        {
            $pid = pcntl_fork();
            if (-1 === $pid) {
                throw new Exception("fork fail");
            } elseif (0 === $pid) {
                echo "fork pid:".getmypid()."\n";
                while (1) {
                    if(($msgsock = socket_accept($this->sock)) < 0) {
                        echo "socket_accept() failed: reason: " . socket_strerror($msgsock) . " ,pid: ".getmypid()."\n";
                        break;
                    }else{
                        $msg ="测试成功 ! \n";
                        echo $msg."pid: ".getmypid()."\n";
                        socket_write($msgsock, $msg, strlen($msg));
                    }
                }
            }    
        }
        while(1)
        {
            $status = 0;
            $pid = pcntl_wait($status,WUNTRACED);    
            if($pid > 0)
            {
                echo "pid:$pid exit,status:$status";
            }        
        }

    }

}

$server = new Server();
$server->main();

二、单个进程监听多个端口

<?php

/**
* 
*/
class Server
{
    protected $socks = array();
    protected $event_base = null;
    protected $events = array();
    public function __construct()
    {
        $this->event_base = event_base_new();
    }

    protected function acceptConnect($sock)
    {
        echo "acceptConnect pid:".getmypid()."\n";
        //sleep(5);
        if(($msgsock = socket_accept($sock)) < 0) {
            echo "socket_accept() failed: reason: " . socket_strerror($msgsock) . " ,pid: ".getmypid()."\n";
            //break;
        }else{
            $msg ="测试成功,sock:$sock ! \n";
            echo $msg."pid: ".getmypid()."\n";
            socket_write($msgsock, $msg, strlen($msg));
            socket_close($msgsock);
        }
    }

    protected function addEvent($sock,$callback)
    {
        $event = event_new();

        if (!event_set($event, $sock, EV_READ|EV_PERSIST, $callback, null)) {
            echo "event_set faild,pid:".getmypid()."\n";
            return ;
        }

         if (!event_base_set($event,$this->event_base)) {
            echo "event_base_set faild,pid:".getmypid()."\n";
            return ;
        }

        if (!event_add($event)) {
            echo "event_add faild,pid:".getmypid()."\n";
            return ;
        }

        $this->event[] = $event;
    }

    public function listen($ip = '127.0.0.1',$port = '5000')
    {
        if(($sock = socket_create(AF_INET,SOCK_STREAM,SOL_TCP)) < 0) {
            echo "socket_create() 失败的原因是:".socket_strerror($sock)."\n";
            return ;
        }

        if(($ret = socket_bind($sock,$ip,$port)) < 0) {
            echo "socket_bind() 失败的原因是:".socket_strerror($ret)."\n";
            return ;
        }

        if(($ret = socket_listen($sock,4)) < 0) {
            echo "socket_listen() 失败的原因是:".socket_strerror($ret)."\n";
            return ;
        }

        $this->socks[] = $sock;
    }

    public function main()
    {
        if($this->event_base == null)
        {
            echo "event base null";
            return ;
        }
        echo "event base:".$this->event_base."\n";
        foreach ($this->socks as $sock) {
            echo "sock:$sock\n";
            $this->addEvent($sock,array($this,'acceptConnect'));
        }
        echo "libevent success,pid:".getmypid()."\n";
        $result = event_base_loop($this->event_base);        
        echo "event loop result:$result";
    }

}

$server = new Server();
$server->listen('127.0.0.1','5000');
$server->listen('127.0.0.1','5001');
$server->main();
<?php

/**
* 
*/
class Server
{
    protected $socks = array();
    protected $event_base = null;
    protected $events = array();
    public function __construct()
    {
        $this->event_base = event_base_new();
    }

    protected function acceptConnect($sock)
    {
        echo "acceptConnect pid:".getmypid()."\n";
        //sleep(5);
        if(($msgsock = socket_accept($sock)) < 0) {
            echo "socket_accept() failed: reason: " . socket_strerror($msgsock) . " ,pid: ".getmypid()."\n";
            //break;
        }else{
            $msg ="测试成功,sock:$sock ! \n";
            echo $msg."pid: ".getmypid()."\n";
            socket_write($msgsock, $msg, strlen($msg));
            socket_close($msgsock);
        }
    }

    protected function addEvent($sock,$callback)
    {
        $event = event_new();

        if (!event_set($event, $sock, EV_READ|EV_PERSIST, $callback, null)) {
            echo "event_set faild,pid:".getmypid()."\n";
            return ;
        }

         if (!event_base_set($event,$this->event_base)) {
            echo "event_base_set faild,pid:".getmypid()."\n";
            return ;
        }

        if (!event_add($event)) {
            echo "event_add faild,pid:".getmypid()."\n";
            return ;
        }

        $this->event[] = $event;
    }

    public function listen($ip = '127.0.0.1',$port = '5000')
    {
        if(($sock = socket_create(AF_INET,SOCK_STREAM,SOL_TCP)) < 0) {
            echo "socket_create() 失败的原因是:".socket_strerror($sock)."\n";
            return ;
        }

        if(($ret = socket_bind($sock,$ip,$port)) < 0) {
            echo "socket_bind() 失败的原因是:".socket_strerror($ret)."\n";
            return ;
        }

        if(($ret = socket_listen($sock,4)) < 0) {
            echo "socket_listen() 失败的原因是:".socket_strerror($ret)."\n";
            return ;
        }

        $this->socks[] = $sock;
    }

    public function main()
    {
        if($this->event_base == null)
        {
            echo "event base null";
            return ;
        }
        echo "event base:".$this->event_base."\n";
        foreach ($this->socks as $sock) {
            echo "sock:$sock\n";
            $this->addEvent($sock,array($this,'acceptConnect'));
        }
        echo "libevent success,pid:".getmypid()."\n";
        $result = event_base_loop($this->event_base);        
        echo "event loop result:$result";
    }

}

$server = new Server();
$server->listen('127.0.0.1','5000');
$server->listen('127.0.0.1','5001');
$server->main();





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