pcap_loop 和 pcap_dispatch 区别 [英] pcap_loop and pcap_dispatch Difference

问题描述

pcap_loop 和 pcap_dispatch 到底有什么区别?

What exactly is the difference between pcap_loop and pcap_dispatch?

推荐答案

手册对此进行了非常好的描述(我是板着脸说，保证).来自 man pcap_loop:

The manual describes this amazingly well (I'm saying that with a straight face, promise). From man pcap_loop:

   pcap_loop() processes packets from a  live  capture  or  ``savefile''
   until  cnt  packets  are  processed,  the  end of the ``savefile'' is
   reached when reading from a ``savefile'', pcap_breakloop() is called,
   or  an  error  occurs.   It  does  not return when live read timeouts
   occur.  A value of -1 or 0 for cnt is equivalent to infinity, so that
   packets are processed until another ending condition occurs.

   pcap_dispatch() processes packets from a live capture or ``savefile''
   until cnt packets are processed, the end of the current bufferful  of
   packets  is reached when doing a live capture, the end of the ``save‐
   file'' is reached when reading from a ``savefile'',  pcap_breakloop()
   is  called, or an error occurs.  Thus, when doing a live capture, cnt
   is the maximum number of packets to process before returning, but  is
   not a minimum number; when reading a live capture, only one bufferful
   of packets is read at a time, so fewer than cnt packets may  be  pro‐
   cessed. A value of -1 or 0 for cnt causes all the packets received in
   one buffer to be processed when reading a live  capture,  and  causes
   all  the  packets  in the file to be processed when reading a ``save‐
   file''.

我知道您并不是真的想阅读和理解所有内容，所以让我们分解一下.

I know you didn't really want to read and understand all that, so let's break it down.

两种功能:

• 处理来自实时捕获或保存文件"的数据包，直到出现以下任何一种情况:
  • 达到指定数量
  • 到达保存文件"的末尾
  • pcap_breakloop() 被调用
  • 发生错误

  pcap_dispatch() 单独

  • 也在当前缓冲的数据包结束后返回，当进行实时捕获时(换句话说，可以更频繁地返回，因为指定的计数不是最小值)

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