scratch filter 中文意思是什麼
scratch filter
解釋
唱針沙聲濾波器-
When you create a filter from scratch, you start with a blank filter to which you add each field and specify details such as data alignment within a field, field width, and the field title that appears on screen. when you create a filter based on an existing filter, you modify a copy of the existing filter without changing the original. when you edit an existing filter, you change the original filter.
如果要重新創建篩選器，將從一個空篩選器開始，向其中添加每個域並指定詳細信息（譬如域中數據的對齊方式、域的寬度和顯示在屏幕上的域標題） ；基於現有的篩選器創建篩選器時，修改的是現有篩選器的副本而不是原篩選器；編輯現有的篩選器時，修改的是原篩選器。 -
The filter in bpf was implemented by a pseudo machine, which consists of an accumulator, an index register, a scratch memory store, and an implicit program counter. bpf can be directly programmed via ioctl system call and the pseudo machine instruction set, it can also be programmed by using libpcap function library, which can access many kinds of packet capture facilities provided by oses ( bpf is the important one in them )
Bpf的過濾器是由假想的過濾器虛擬機實現的，對bpf的編程，可以通過ioctl系統調用和過濾器虛擬機的指令集來直接編程，也可以通過libpcap提供的庫函數來編程，它能訪問許多種操作系統內核提供的包過濾設施（ bpf是其中重要的一種） 。
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