erl_epmd模块¶

Erlang interface towards epmd

start_link/0¶

结构:

start_link() -> {ok, pid()} | ignore | {error, term()}
此函数在模块被以erl_distribution supervisor的child加入时被调用

register_node/2/3¶

结构:

register_node(Name, Port) -> Result
register_node(Name, Port, Driver) -> Result
类型
Name = string()
Port = integer() >= 0
Driver = inet_tcp | inet6_tcp | inet | inet6
Creation = integer() >= 0
Result = {ok, Creation} | {error, already_registered} | term()

说明:

Registers the node with epmd 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.

port_please/2/3¶

结构:

port_please(Name, Host) -> {ok, Port, Version} | noport
port_please(Name, Host, Timeout) -> {ok, Port, Version} | noport
Types
Name = string()
Host = inet:ip_address()
Timeout = integer() >= 0 | infinity
Port = Version = integer() >= 0

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.

实例:

(arne@dunn)1> erl_epmd:names(localhost).
{ok,[{"arne",40262}]}