The R13B03 release.OTP_R13B03

1 files changed, 304 insertions, 0 deletions

diff --git a/lib/kernel/examples/uds_dist/src/uds_dist.erl b/lib/kernel/examples/uds_dist/src/uds_dist.erl
new file mode 100644
index 0000000000..7a9c15a3c8
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+++ b/lib/kernel/examples/uds_dist/src/uds_dist.erl
@@ -0,0 +1,304 @@
+%% ``The contents of this file are subject to the Erlang Public License,
+%% Version 1.1, (the "License"); you may not use this file except in
+%% compliance with the License. You should have received a copy of the
+%% Erlang Public License along with this software. If not, it can be
+%% retrieved via the world wide web at http://www.erlang.org/.
+%% 
+%% Software distributed under the License is distributed on an "AS IS"
+%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+%% the License for the specific language governing rights and limitations
+%% under the License.
+%% 
+%% The Initial Developer of the Original Code is Ericsson Utvecklings AB.
+%% Portions created by Ericsson are Copyright 1999, Ericsson Utvecklings
+%% AB. All Rights Reserved.''
+%% 
+%%     $Id$
+%%
+-module(uds_dist).
+
+%% Handles the connection setup phase with other Erlang nodes.
+
+-export([childspecs/0, listen/1, accept/1, accept_connection/5,
+	 setup/4, close/1, select/1, is_node_name/1]).
+
+%% internal exports
+
+-export([accept_loop/2,do_accept/6,do_setup/5, getstat/1,tick/1]).
+
+-import(error_logger,[error_msg/2]).
+
+-include("net_address.hrl").
+
+
+
+-define(to_port(Socket, Data),
+	case uds:send(Socket, Data) of
+	    {error, closed} ->
+		self() ! {uds_closed, Socket},
+	        {error, closed};
+	    R ->
+	        R
+        end).
+
+
+-include("dist.hrl").
+-include("dist_util.hrl").
+-record(tick, {read = 0,
+	       write = 0,
+	       tick = 0,
+	       ticked = 0
+	       }).
+
+
+%% -------------------------------------------------------------
+%% This function should return a valid childspec, so that 
+%% the primitive ssl_server gets supervised
+%% -------------------------------------------------------------
+childspecs() ->
+    {ok, [{uds_server,{uds_server, start_link, []},
+	   permanent, 2000, worker, [uds_server]}]}.
+
+
+%% ------------------------------------------------------------
+%%  Select this protocol based on node name
+%%  select(Node) => Bool
+%% ------------------------------------------------------------
+
+select(Node) ->
+    {ok, MyHost} = inet:gethostname(),
+    case split_node(atom_to_list(Node), $@, []) of
+	[_, MyHost] ->
+	    true;
+	_ -> 
+	    false
+    end.
+
+%% ------------------------------------------------------------
+%% Create the listen socket, i.e. the port that this erlang
+%% node is accessible through.
+%% ------------------------------------------------------------
+
+listen(Name) ->
+    case uds:listen(atom_to_list(Name)) of
+	{ok, Socket} ->
+	    {ok, {Socket, 
+		  #net_address{address = [], 
+			       host = inet:gethostname(),
+			       protocol = uds, 
+			       family = uds}, 
+		  uds:get_creation(Socket)}};
+	Error ->
+	    Error
+    end.
+
+%% ------------------------------------------------------------
+%% Accepts new connection attempts from other Erlang nodes.
+%% ------------------------------------------------------------
+
+accept(Listen) ->
+    spawn_link(?MODULE, accept_loop, [self(), Listen]).
+
+accept_loop(Kernel, Listen) ->
+    process_flag(priority, max),
+    case uds:accept(Listen) of
+	{ok, Socket} ->
+	    Kernel ! {accept,self(),Socket,uds,uds},
+	    controller(Kernel, Socket),
+	    accept_loop(Kernel, Listen);
+	Error ->
+	    exit(Error)
+    end.
+
+controller(Kernel, Socket) ->
+    receive
+	{Kernel, controller, Pid} ->
+	    uds:controlling_process(Socket, Pid),
+	    Pid ! {self(), controller};
+	{Kernel, unsupported_protocol} ->
+	    exit(unsupported_protocol)
+    end.
+
+%% ------------------------------------------------------------
+%% Accepts a new connection attempt from another Erlang node.
+%% Performs the handshake with the other side.
+%% ------------------------------------------------------------
+
+accept_connection(AcceptPid, Socket, MyNode, Allowed, SetupTime) ->
+    spawn_link(?MODULE, do_accept,
+	       [self(), AcceptPid, Socket, MyNode,
+		Allowed, SetupTime]).
+
+do_accept(Kernel, AcceptPid, Socket, MyNode, Allowed, SetupTime) ->
+    process_flag(priority, max),
+    receive
+	{AcceptPid, controller} ->
+	    Timer = dist_util:start_timer(SetupTime),
+	    HSData = #hs_data{
+	      kernel_pid = Kernel,
+	      this_node = MyNode,
+	      socket = Socket,
+	      timer = Timer,
+	      this_flags = ?DFLAG_PUBLISHED bor
+	      ?DFLAG_ATOM_CACHE bor
+	      ?DFLAG_EXTENDED_REFERENCES bor
+	      ?DFLAG_DIST_MONITOR bor
+	      ?DFLAG_FUN_TAGS,
+	      allowed = Allowed,
+	      f_send = fun(S,D) -> uds:send(S,D) end,
+	      f_recv = fun(S,N,T) -> uds:recv(S) 
+		       end,
+	      f_setopts_pre_nodeup = 
+	      fun(S) ->
+		      uds:set_mode(S, intermediate)
+	      end,
+	      f_setopts_post_nodeup = 
+	      fun(S) ->
+		      uds:set_mode(S, data)
+	      end,
+	      f_getll = fun(S) ->
+				uds:get_port(S)
+			end,
+	      f_address = fun get_remote_id/2,
+	      mf_tick = {?MODULE, tick},
+	      mf_getstat = {?MODULE,getstat}
+	     },
+	    dist_util:handshake_other_started(HSData)
+    end.
+
+%% ------------------------------------------------------------
+%% Get remote information about a Socket.
+%% ------------------------------------------------------------
+
+get_remote_id(Socket, Node) ->
+    [_, Host] = split_node(atom_to_list(Node), $@, []),
+    #net_address {
+		  address = [],
+		  host = Host,
+		  protocol = uds,
+		  family = uds }.
+
+%% ------------------------------------------------------------
+%% Setup a new connection to another Erlang node.
+%% Performs the handshake with the other side.
+%% ------------------------------------------------------------
+
+setup(Node, MyNode, LongOrShortNames,SetupTime) ->
+    spawn_link(?MODULE, do_setup, [self(),
+				   Node,
+				   MyNode,
+				   LongOrShortNames,
+				   SetupTime]).
+
+do_setup(Kernel, Node, MyNode, LongOrShortNames,SetupTime) ->
+    process_flag(priority, max),
+    ?trace("~p~n",[{uds_dist,self(),setup,Node}]),
+    [Name, Address] = splitnode(Node, LongOrShortNames),
+    {ok, MyName} = inet:gethostname(), 
+    case Address of
+	MyName ->
+	    Timer = dist_util:start_timer(SetupTime),
+	    case uds:connect(Name) of
+		{ok, Socket} ->
+		    HSData = #hs_data{
+		      kernel_pid = Kernel,
+		      other_node = Node,
+		      this_node = MyNode,
+		      socket = Socket,
+		      timer = Timer,
+		      this_flags = ?DFLAG_PUBLISHED bor
+		      ?DFLAG_ATOM_CACHE bor
+		      ?DFLAG_EXTENDED_REFERENCES bor
+		      ?DFLAG_DIST_MONITOR bor
+		      ?DFLAG_FUN_TAGS,
+		      other_version = 1,
+		      f_send = fun(S,D) -> 
+				       uds:send(S,D) 
+			       end,
+			      f_recv = fun(S,N,T) -> 
+					       uds:recv(S) 
+				       end,
+		      f_setopts_pre_nodeup = 
+		      fun(S) ->
+			      uds:set_mode(S, intermediate)
+		      end,
+		      f_setopts_post_nodeup = 
+		      fun(S) ->
+			      uds:set_mode(S, data)
+		      end,
+		      f_getll = fun(S) ->
+					uds:get_port(S)
+				end,
+		      f_address = 
+		      fun(_,_) ->
+			      #net_address{
+			        address = [],
+			        host = Address,
+			        protocol = uds,
+			        family = uds}
+		      end,
+		      mf_tick = {?MODULE, tick},
+		      mf_getstat = {?MODULE,getstat}
+		     },
+		    dist_util:handshake_we_started(HSData);
+		_ ->
+		    ?shutdown(Node)
+	    end;
+	Other ->
+	    ?shutdown(Node)
+    end.
+
+%%
+%% Close a socket.
+%%
+close(Socket) ->
+    uds:close(Socket).
+
+
+%% If Node is illegal terminate the connection setup!!
+splitnode(Node, LongOrShortNames) ->
+    case split_node(atom_to_list(Node), $@, []) of
+	[Name|Tail] when Tail /= [] ->
+	    Host = lists:append(Tail),
+	    case split_node(Host, $., []) of
+		[_] when LongOrShortNames == longnames ->
+		    error_msg("** System running to use "
+			      "fully qualified "
+			      "hostnames **~n"
+			      "** Hostname ~s is illegal **~n",
+			      [Host]),
+		    ?shutdown(Node);
+		L when length(L) > 1, LongOrShortNames == shortnames ->
+		    error_msg("** System NOT running to use fully qualified "
+			      "hostnames **~n"
+			      "** Hostname ~s is illegal **~n",
+			      [Host]),
+		    ?shutdown(Node);
+		_ ->
+		    [Name, Host]
+	    end;
+	[_] ->
+	    error_msg("** Nodename ~p illegal, no '@' character **~n",
+		      [Node]),
+	    ?shutdown(Node);
+	_ ->
+	    error_msg("** Nodename ~p illegal **~n", [Node]),
+	    ?shutdown(Node)
+    end.
+
+split_node([Chr|T], Chr, Ack) -> [lists:reverse(Ack)|split_node(T, Chr, [])];
+split_node([H|T], Chr, Ack)   -> split_node(T, Chr, [H|Ack]);
+split_node([], _, Ack)        -> [lists:reverse(Ack)].
+
+is_node_name(Node) when atom(Node) ->
+    case split_node(atom_to_list(Node), $@, []) of
+	[_, Host] -> true;
+	_ -> false
+    end;
+is_node_name(Node) ->
+    false.
+
+tick(Sock) ->
+    uds:tick(Sock).
+getstat(Socket) ->
+    uds:get_status_counters(Socket).