Signed-off-by: Karel Zak <kzak@redhat.com>
If pid namespaces are supported then this function will also print
the pid of a given pidfd refers to for all descendant pid namespaces
starting from the current pid namespace of the instance, i.e. the
-Pid field and the first entry in the NSpid field will be identical. +
-... +
+Pid field and the first entry in the NSpid field will be identical.
+
Note that this differs from the Pid and NSpid fields in
/proc/<pid>/status where Pid and NSpid are always shown relative to
the pid namespace of the procfs instance.