瞥socket 好多东西不明白

程序员文章站 2022-04-21 12:22:21

...

看socket 好多东西不明白
网上下了个html5 发socket 给php.server

php.server里面有些地方不明白呀

部分代码

		function __construct ($address, $port) {
			error_reporting (E_ALL);
			set_time_limit (0);
			ob_implicit_flush ();

			// Socket creation
			$this->master = socket_create (AF_INET, SOCK_STREAM, SOL_TCP) or die("socket_create() failed");
			socket_set_option ($this->master, SOL_SOCKET, SO_REUSEADDR, 1) or die("socket_option() failed");
			socket_bind ($this->master, $address, $port) or die("socket_bind() failed");
			socket_listen ($this->master, 20) or die("socket_listen() failed");
			$this->sockets[] = $this->master;
			$this->say ("Server Started : " . date ('Y-m-d H:i:s'));
			$this->say ("Listening on   : {$address} {$port}");
			$this->say ("Master socket  : {$this->master}\n");

			// Main loop
			while (true) {

				$changed = $this->sockets;
				socket_select ($changed, $write = NULL, $except = NULL, NULL);

				foreach ($changed as $socket) {
					if ($socket == $this->master) {


						$client = socket_accept ($this->master);

						if ($client 							$this->log ("socket_accept() failed");
							continue;
						}
						else {
							// Connects the socket
							$this->connect ($client);
						}
					}
					else {

						$bytes = @socket_recv ($socket, $buffer, 2048, 0);
						if ($bytes == 0) {
							// On socket.close ();
							$this->disconnect ($socket);
						}
						else {
							// Retrieve the user from his socket
							$user = $this->getuserbysocket ($socket);

							if (!$user->handshake) {
								$this->dohandshake ($user, $buffer);
							}
							else {
								$this->process ($user, $this->decode ($buffer));
							}
						}
					}
				}
			}
		}

我现在linux 下运行了 server.php php server.php
我发现
socket_select ($changed, $write = NULL, $except = NULL, NULL);的时候
就不会在往下下运行了
我在网上查了下socket_select
地址是http://php.net/manual/en/function.socket-select.php

socket_select — Runs the select() system call on the given arrays of sockets with a specified timeout

socket_select() accepts arrays of sockets and waits for them to change status. Those coming with BSD sockets background will recognize that those socket resource arrays are in fact the so-called file descriptor sets. Three independent arrays of socket resources are watched.

按我的理解这个socket_select 可以监听到 sockets 数组里面的东西的状态的变化
当状态没有变化的时候是挂起的就是不会往下执行
这么理解对吗
------解决方案--------------------
socket_select()是等待连接全部有新动态时结束，它有个timeout参数至关重要，其中规定了它最多可以阻塞(可以理解为运行)多长时间。你传入的为 NULL ，则这个函数将会在有所有监听对象有新连接出现后再结束。

声明：本文内容由网友自发贡献，版权归原作者所有，本站不承担相应法律责任。如您发现有涉嫌抄袭侵权的内容，请联系admin@php.cn核实处理。