解析数字ifconfig标志 [英] Parse numeric ifconfig flags

问题描述

ifconfig命令输出其标记.虽然可以找到参考

The ifconfig command outputs its flags in both textual and numeric format. While I can find a reference here or there to the numeric flags, I cannot find any indication on how to interpret (mask) the number.

qfe2: flags=1100843<UP,BROADCAST,RUNNING,MULTICAST,ROUTER,IPv4> mtu
  1500 index 4
  usesrc vni0
  inet 1.2.3.4 netmask ffffff00 broadcast 1.2.3.255
  ether 0:3:ba:17:4b:e1
vni0: flags=20011100c1<UP,RUNNING,NOARP,NOXMIT,ROUTER,IPv4,VIRTUAL>
  mtu 0 index 5
  srcof qfe2
  inet 3.4.5.6 netmask ffffffff

在上面的输出中，请注意以下几点:

In the above output, note the following:

flags=1100843<UP,BROADCAST,RUNNING,MULTICAST,ROUTER,IPv4>

数值"1100843"映射到标志"UP,BROADCAST,RUNNING,MULTICAST,ROUTER,IPv4".

The numeric value "1100843" maps to the flags "UP,BROADCAST,RUNNING,MULTICAST,ROUTER,IPv4".

我在某个地方没有找到一个引用，该引用描述了如何从编码的"flags=NNNNNNNN"值中屏蔽每个标志(UP,BROADCAST,等)?

Is there a reference somewhere that I'm simply not seeing that describes how to mask each flag (UP,BROADCAST,etc.) out of the encoded "flags=NNNNNNNN" value?

编辑:明确说明我对屏蔽哪个标志感兴趣.

EDIT: Clarification of exactly which flag I'm interested in masking.

推荐答案

标志值在头文件

The flag values are defined in the header file /usr/include/net/if.h (on Solaris). The value shown is the bitwise-OR of the flags that are set for that interface.

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