Merge pull request #1459 from pguyot/w02/erlang-distribution-01

Introduce erlang distribution

- Add support for handshake from OTP nodes
- Add support for monitoring processes and sending messages to registered processes from OTP nodes

These changes are made under both the "Apache 2.0" and the "GNU Lesser General
Public License 2.1 or later" license terms (dual license).

SPDX-License-Identifier: Apache-2.0 OR LGPL-2.1-or-later

Author: bettio

examples/erlang/CMakeLists.txt

@@ -41,3 +41,4 @@ pack_runnable(mqtt_client mqtt_client estdlib eavmlib)
 pack_runnable(network_console network_console estdlib eavmlib alisp)
 pack_runnable(logging_example logging_example estdlib eavmlib)
 pack_runnable(http_client http_client estdlib eavmlib)
+pack_runnable(disterl disterl estdlib)

examples/erlang/disterl.erl

@@ -0,0 +1,41 @@
+%
+% This file is part of AtomVM.
+%
+% Copyright 2024 Paul Guyot <pguyot@kallisys.net>
+%
+% 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.
+%
+% SPDX-License-Identifier: Apache-2.0 OR LGPL-2.1-or-later
+%
+
+-module(disterl).
+
+-export([start/0]).
+
+start() ->
+    {ok, _KernelPid} = kernel:start(normal, []),
+    {ok, _NetKernelPid} = net_kernel:start('atomvm@127.0.0.1', #{name_domain => longnames}),
+    io:format("Distribution was started\n"),
+    io:format("Node is ~p\n", [node()]),
+    net_kernel:set_cookie(<<"AtomVM">>),
+    io:format("Cookie is ~s\n", [net_kernel:get_cookie()]),
+    register(disterl, self()),
+    io:format(
+        "This AtomVM node is waiting for 'quit' message, and this process is registered as 'disterl'\n"
+    ),
+    io:format("On an OTP node with long names distribution, run:\n"),
+    io:format("erlang:set_cookie('atomvm@127.0.0.1', 'AtomVM').\n"),
+    io:format("{disterl, 'atomvm@127.0.0.1'} ! quit.\n"),
+    receive
+        quit -> ok
+    end.

libs/estdlib/src/CMakeLists.txt

@@ -23,11 +23,13 @@ project(estdlib)
 include(BuildErlang)
 
 set(ERLANG_MODULES
+    application
     base64
     binary
     calendar
     code
     crypto
+    dist_util
     erl_epmd
     erts_debug
     ets
@@ -41,6 +43,9 @@ set(ERLANG_MODULES
     gen_tcp_inet
     gen_tcp_socket
     supervisor
+    kernel
+    net_kernel
+    net_kernel_sup
     inet
     io_lib
     io
@@ -54,6 +59,8 @@ set(ERLANG_MODULES
     queue
     sets
     socket
+    socket_dist
+    socket_dist_controller
     ssl
     string
     timer

libs/estdlib/src/application.erl

@@ -0,0 +1,37 @@
+%
+% This file is part of AtomVM.
+%
+% Copyright 2025 Paul Guyot <pguyot@kallisys.net>
+%
+% 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.
+%
+% SPDX-License-Identifier: Apache-2.0 OR LGPL-2.1-or-later
+%
+
+-module(application).
+-export([get_env/3]).
+-export_type([start_type/0]).
+
+-type start_type() :: normal | {takeover, Node :: node()} | {failover, Node :: node()}.
+
+%%-----------------------------------------------------------------------------
+%% @param   Application application to get the parameter value of
+%% @param   Parameter parameter to get the value of
+%% @param   Default default value if parameter is not found
+%% @returns default value
+%% @doc     Retrieve the value of the configuration parameter `Parameter' for
+%%          application `Application' or `Default' if not found.
+%% @end
+%%-----------------------------------------------------------------------------
+-spec get_env(Application :: atom(), Parameter :: atom(), Default :: any()) -> any().
+get_env(_Application, _Parameter, Default) -> Default.