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Port the gen_fsm code for format_status to gen_event in order to
prevent a lists:concat([...,pid()]) crash when calling
sys:get_status/1 on an unregistered gen_event process.
Refactor format_status header code from gen_* behaviours to module gen.
Extend the format_status tests in gen_event_SUITE to cover
format_status bugs with anonymous gen_event processes.
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The gen_server and gen_fsm behaviors support the format_status
callback to allow developers to specialize how callback module state
appears within the return value of sys:get_status and within logged
output resulting from abnormal process termination. This patch adds
similar support to gen_event.
Event handlers that export a format_status/2 function, which is an
optional callback, and are registered with an event manager will now
have their format_status callbacks invoked when sys:get_status is
called on the event manager. The term returned from format_status for
this case replaces the default handler state in the sys:get_status
return value.
This patch also extends gen_event to call an event handler's
format_status function (if it exports one) should the handler
terminate abnormally. The term returned from format_status is logged
in place of the handler's state. This is intended to allow developers
to control how much output is logged in the case of abnormal
termination.
The documentation is appropriately extended and new unit tests are
added to cover the new gen_event format_status functionality.
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* ks/stdlib:
erl_parse.yrl: Add missing operator in type declaration
stdlib: Add types and specs
stdlib: Use fun object instead of {M,F} tuple
ets: Cleanup as suggested by tidier
OTP-8576 ks/stdlib
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