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                            # Coroutine\\Socket::\_\_construct
[TOC]
構造`Coroutine\Socket`對象。

~~~
function Coroutine\Socket::__construct(int $domain, int $type, int $protocol);

~~~

詳情可參見`man socket`文檔。

*   `$domain`：協議域，可使用`AF_INET`、`AF_INET6`、`AF_UNIX`
*   `$type`：類型，可使用`SOCK_STREAM`、`SOCK_DGRAM`、`SOCK_RAW`
*   `$protocol`：協議，`IPPROTO_TCP`、`IPPROTO_UDP`、`IPPROTO_STCP`、`IPPROTO_TIPC`，可設置為`0`

構造方法會調用`socket`系統調用創建一個`socket`句柄。調用失敗時會拋出`Swoole\Coroutine\Socket\Exception`異常。并設置`$socket->errCode`屬性。可根據該屬性的值得到系統調用失敗的原因。

### 屬性

*   `$socket->fd`: socket對應的文件描述符ID
*   `$socket->errCode`: 錯誤碼
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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