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                pbuf\_header()函數用于調整pbuf的payload指針(向前或向后移動一定字節數),在前面也說到過,在pbuf的數據區前可能會預留一些協議首部空間,而pbuf被創建時,payload指針是指向數據區的,為了實現對這些預留空間的操作,可以調用pbuf\_header()函數使payload指針指向數據區前的首部字段,這就為各層對數據包首部的操作提供了方便。當然,進行這個操作的時候,len和tot\_len字段值也會隨之更新。
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