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authorTimmo Verlaan <[email protected]>2018-01-29 21:27:22 +0100
committerLukas Larsson <[email protected]>2018-05-16 17:49:44 +0200
commit662f3c7ba50ff8ec13d86171bcfc61fd3da9deed (patch)
treec083608e4f9eb83a4539b5f4a30d1eaf929a0d80 /lib/kernel/doc
parent0c737f730eccd5716b6d87b0ef690fc7ad02d547 (diff)
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epmd: allow alternative to dns resolving for nodename
This makes it possible to create a custom integration with a key-value store for example. The key would then point to the actual address. You would have to write your own epmd module to make use of that feature.
Diffstat (limited to 'lib/kernel/doc')
-rw-r--r--lib/kernel/doc/src/Makefile1
-rw-r--r--lib/kernel/doc/src/erl_epmd.xml104
-rw-r--r--lib/kernel/doc/src/ref_man.xml1
-rw-r--r--lib/kernel/doc/src/specs.xml1
4 files changed, 107 insertions, 0 deletions
diff --git a/lib/kernel/doc/src/Makefile b/lib/kernel/doc/src/Makefile
index 82869d7b15..29dc73a523 100644
--- a/lib/kernel/doc/src/Makefile
+++ b/lib/kernel/doc/src/Makefile
@@ -42,6 +42,7 @@ XML_REF3_FILES = application.xml \
disk_log.xml \
erl_boot_server.xml \
erl_ddll.xml \
+ erl_epmd.xml \
erl_prim_loader_stub.xml \
erlang_stub.xml \
error_handler.xml \
diff --git a/lib/kernel/doc/src/erl_epmd.xml b/lib/kernel/doc/src/erl_epmd.xml
new file mode 100644
index 0000000000..8b076cd2d7
--- /dev/null
+++ b/lib/kernel/doc/src/erl_epmd.xml
@@ -0,0 +1,104 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<!DOCTYPE erlref SYSTEM "erlref.dtd">
+
+<erlref>
+ <header>
+ <copyright>
+ <year>2018</year><year>2018</year>
+ <holder>Ericsson AB. All Rights Reserved.</holder>
+ </copyright>
+ <legalnotice>
+ 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.
+
+ </legalnotice>
+
+ <title>erl_epmd</title>
+ <prepared>Timmo Verlaan</prepared>
+ <docno>1</docno>
+ <date>2018-02-19</date>
+ <rev>A</rev>
+ </header>
+ <module>erl_epmd</module>
+ <modulesummary>
+ Erlang interface towards epmd
+ </modulesummary>
+ <description>
+ <p>This module communicates with the EPMD daemon, see <seealso
+ marker="erts:epmd">epmd</seealso>. To implement your own epmd module please
+ see <seealso marker="erts:alt_disco">ERTS User's Guide: How to Implement an
+ Alternative Service Discovery for Erlang Distribution</seealso></p>
+ </description>
+
+ <funcs>
+ <func>
+ <name name="start_link" arity="0"/>
+ <fsummary>Callback for erl_distribution supervisor.</fsummary>
+ <desc>
+ <p>This function is invoked as this module is added as a child of the
+ <c>erl_distribution</c> supervisor.</p>
+ </desc>
+ </func>
+
+ <func>
+ <name name="register_node" arity="2"/>
+ <name name="register_node" arity="3"/>
+ <fsummary>Registers the node with <c>epmd</c>.</fsummary>
+ <desc>
+ <p>Registers the node with <c>epmd</c> and tells epmd what port will be
+ used for the current node. It returns a creation number. This number is
+ incremented on each register to help with identifying if a node is
+ reconnecting to epmd.</p>
+ </desc>
+ </func>
+
+ <func>
+ <name name="port_please" arity="2"/>
+ <name name="port_please" arity="3"/>
+ <fsummary>Returns the port number for a given node.</fsummary>
+ <desc>
+ <p>Requests the distribution port for the given node of an EPMD
+ instance. Together with the port it returns a distribution protocol
+ version which has been 5 since Erlang/OTP R6.</p>
+ </desc>
+ </func>
+
+ <func>
+ <name name="address_please" arity="3"/>
+ <fsummary>Returns address and port.</fsummary>
+ <desc>
+ <p>Called by the distribution module. Resolves the <c>Host</c> to an IP
+ address.</p>
+ <p>Another epmd module may return port and distribution protocol version
+ as well.</p>
+ </desc>
+ </func>
+
+ <func>
+ <name name="names" arity="1"/>
+ <fsummary>Names of Erlang nodes at a host.</fsummary>
+ <desc>
+ <p>Called by <seealso marker="net_adm"><c>net_adm:names/0</c></seealso>.
+ <c>Host</c> defaults to the localhost. Returns the names and associated
+ port numbers of the Erlang nodes that <c>epmd</c> registered at the
+ specified host. Returns <c>{error, address}</c> if <c>epmd</c> is not
+ operational.</p>
+ <p><em>Example:</em></p>
+ <pre>
+(arne@dunn)1> <input>erl_epmd:names(localhost).</input>
+{ok,[{"arne",40262}]}</pre>
+ </desc>
+ </func>
+ </funcs>
+
+</erlref>
+
diff --git a/lib/kernel/doc/src/ref_man.xml b/lib/kernel/doc/src/ref_man.xml
index c06914d23d..a633ae4832 100644
--- a/lib/kernel/doc/src/ref_man.xml
+++ b/lib/kernel/doc/src/ref_man.xml
@@ -38,6 +38,7 @@
<xi:include href="disk_log.xml"/>
<xi:include href="erl_boot_server.xml"/>
<xi:include href="erl_ddll.xml"/>
+ <xi:include href="erl_epmd.xml"/>
<xi:include href="erl_prim_loader_stub.xml"/>
<xi:include href="erlang_stub.xml"/>
<xi:include href="error_handler.xml"/>
diff --git a/lib/kernel/doc/src/specs.xml b/lib/kernel/doc/src/specs.xml
index bcc422930e..b8c25ca53b 100644
--- a/lib/kernel/doc/src/specs.xml
+++ b/lib/kernel/doc/src/specs.xml
@@ -6,6 +6,7 @@
<xi:include href="../specs/specs_disk_log.xml"/>
<xi:include href="../specs/specs_erl_boot_server.xml"/>
<xi:include href="../specs/specs_erl_ddll.xml"/>
+ <xi:include href="../specs/specs_erl_epmd.xml"/>
<xi:include href="../specs/specs_erl_prim_loader_stub.xml"/>
<xi:include href="../specs/specs_erlang_stub.xml"/>
<xi:include href="../specs/specs_error_handler.xml"/>