From 0f1a85ef0373f2b5767579a30a6dc29eeb16438a Mon Sep 17 00:00:00 2001
From: Raimo Niskanen <raimo@erlang.org>
Date: Fri, 27 May 2016 14:23:53 +0200
Subject: Rewrite inet* for address family 'local'

---
 lib/kernel/src/local_udp.erl | 99 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 99 insertions(+)
 create mode 100644 lib/kernel/src/local_udp.erl

(limited to 'lib/kernel/src/local_udp.erl')

diff --git a/lib/kernel/src/local_udp.erl b/lib/kernel/src/local_udp.erl
new file mode 100644
index 0000000000..ebb4d2b33f
--- /dev/null
+++ b/lib/kernel/src/local_udp.erl
@@ -0,0 +1,99 @@
+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 1997-2016. All Rights Reserved.
+%%
+%% Licensed under the Apache License, Version 2.0 (the "License");
+%% you may not use this file except in compliance with the License.
+%% You may obtain a copy of the License at
+%%
+%%     http://www.apache.org/licenses/LICENSE-2.0
+%%
+%% Unless required by applicable law or agreed to in writing, software
+%% distributed under the License is distributed on an "AS IS" BASIS,
+%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+%% See the License for the specific language governing permissions and
+%% limitations under the License.
+%%
+%% %CopyrightEnd%
+%%
+-module(local_udp).
+
+-export([open/1, open/2, close/1]).
+-export([send/2, send/4, recv/2, recv/3, connect/3]).
+-export([controlling_process/2]).
+-export([fdopen/2]).
+
+-export([getserv/1, getaddr/1, getaddr/2, translate_ip/1]).
+
+-include("inet_int.hrl").
+
+-define(FAMILY, local).
+-define(PROTO, udp).
+-define(TYPE, dgram).
+
+
+%% port lookup
+getserv(0) -> {ok, 0}.
+
+%% no address lookup
+getaddr({?FAMILY, _} = Address) -> {ok, Address}.
+getaddr({?FAMILY, _} = Address, _Timer) -> {ok, Address}.
+
+%% special this side addresses
+translate_ip(IP) -> IP.
+
+open(0) -> open(0, []).
+%%
+open(0, Opts) ->
+    case inet:udp_options(
+	   [{port,0} | Opts],
+	   ?MODULE) of
+	{error, Reason} -> exit(Reason);
+	{ok,
+	 #udp_opts{
+	    fd = Fd,
+	    ifaddr = BAddr,
+	    port = 0,
+	    opts = SockOpts}}
+	when tuple_size(BAddr) =:= 2, element(1, BAddr) =:= ?FAMILY;
+	     BAddr =:= any ->
+	    inet:open(
+	      Fd, BAddr, 0, SockOpts, ?PROTO, ?FAMILY, ?TYPE, ?MODULE);
+	{ok, _} -> exit(badarg)
+    end.
+
+send(S, Addr = {?FAMILY,_}, 0, Data) ->
+    prim_inet:sendto(S, Addr, 0, Data).
+%%
+send(S, Data) ->
+    prim_inet:sendto(S, {?FAMILY,<<>>}, 0, Data).
+
+connect(S, Addr = {?FAMILY,_}, 0) ->
+    prim_inet:connect(S, Addr, 0).
+
+recv(S, Len) ->
+    prim_inet:recvfrom(S, Len).
+%%
+recv(S, Len, Time) ->
+    prim_inet:recvfrom(S, Len, Time).
+
+close(S) ->
+    inet:udp_close(S).
+
+%%
+%% Set controlling process:
+%% 1) First sync socket into a known state
+%% 2) Move all messages onto the new owners message queue
+%% 3) Commit the owner
+%% 4) Wait for ack of new Owner (since socket does some link and unlink)
+%%
+
+controlling_process(Socket, NewOwner) ->
+    inet:udp_controlling_process(Socket, NewOwner).
+
+%%
+%% Create a port/socket from a file descriptor
+%%
+fdopen(Fd, Opts) ->
+    inet:fdopen(Fd, Opts, ?PROTO, ?FAMILY, ?TYPE, ?MODULE).
-- 
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