net: add FlagRunning to exactly reflect the states of an interface.
Correctly set this flag while parsing the syscall result.
The FlagUp flag can not distinguish the following situations:
1. interface is plugged, automatically up, and in running(UP) state
2. interface is not plugged, administratively or manually set to up,
but in DOWN state
So, We can't distinguish the state of a NIC by the FlagUp flag alone.
Fixes #53482
Change-Id: I43796bea1a7f72d1fddfef914efe603c81995e1b
GitHub-Last-Rev:
686b5d888e97e9b90cf36ac0c15943eb97e125d4
GitHub-Pull-Request: golang/go#53484
Reviewed-on: https://go-review.googlesource.com/c/go/+/413454
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Run-TryBot: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Ryan Schuster <shuey19831@gmail.com>
Reviewed-by: Jianwei Mao <maojianwei2020@gmail.com>
Reviewed-by: Damien Neil <dneil@google.com>