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authorRoger Lipscombe <[email protected]>2015-09-07 19:53:43 +0100
committerRoger Lipscombe <[email protected]>2015-10-02 07:52:14 +0100
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Pass 'raw' options through
In Erlang R16B03-1, I've been passing raw options to ssl:listen as follows, and it's been working fine: % The constants are defined elsewhere. LOpts = [{raw, ?IPPROTO_TCP, ?TCP_MAXSEG, <<MSS:32/native>>} | ...], {ok, LSocket} = ssl:listen(0, LOpts) In Erlang 17.3, this fails with {option_not_a_key_value_tuple,{raw,6,2,<<64,2,0,0>>}} I originally reported this in http://erlang.org/pipermail/erlang-questions/2014-October/081226.html I need to pass this particular raw option to ssl:listen, because it needs to be applied when the socket is first opened -- between inet:open and prim_inet:listen -- it cannot be applied later by setopts. This means that it needs to be done by inet_tcp:listen/2 -- well, actually by inet:open/8, but... Otherwise it's racey -- a client could connect between prim_inet:listen and the setopts call. The MSS option is advertised in the SYN,ACK packet, and can't be changed later.
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