[Bug 228831] netstat -Aan -M no longer reads from the corefile

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=228831

            Bug ID: 228831
           Summary: netstat -Aan -M no longer reads from the corefile
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: jtl at freebsd.org

You should be able to run 'netstat' against a corefile using the -M option.
This lets you do things such as display the TCP connections (and the addresses
of their associated control blocks).

In FreeBSD-CURRENT, if you run 'netstat -Aan -M <corefile>', it will return
output. However, the output is taken from the running system, rather than the
coredump. I believe there is no warning that this is the case.

We need to either:
(a) Restore the old behavior (preferred), or
(b) Return an error when a user tries to read from a corefile.

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