[erlang-questions] async_accept

Steve Vinoski <>
Thu Feb 6 13:28:29 CET 2014

On Thu, Feb 6, 2014 at 5:35 AM, Sean Cribbs <> wrote:

> Does anyone know offhand what is the meaning of integer returned in the
> {ok, _} return value of prim_inet:async_accept/2? It's not documented
> clearly.

It's essentially a reference, but it's generated from a counter internal to
the inet driver so it's not an actual Erlang reference. It's the value of
the 3rd element of the inet_async message you get when a connection
arrives, allowing you to match those messages with the async_accept calls
that caused them: For example:

1> prim_inet:async_accept(L,-1).
2> flush().

The value 3 here is the reference.

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