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                            一個輸入操作(網絡輸入)通常包括兩個階段：
*   等待數據準備好
*   從內核向進程復制數據
對于一個套接字上的輸入操作：
第一步通常涉及等待數據從網絡中到達。當所等待數據到達時，它被復制到內核中的某個緩沖區；
第二步就是把數據從內核緩沖區復制到應用進程緩沖區
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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