The function has nothing to do with any Manager object, hence drop that from the name. And it actually looks something up by handle *action* not by *handle*, hence the old name was a bit misnomer. Let's call it handle_action_lookup(), as it queries handle action metainfo for a handle action. Also, let's make sure it behaves more like our usual functions that lookup some fixed data from some enum value/int: let's return NULL if we don't find it.
System and Service Manager
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