erlang:UNIX域套接字支持？

Question

有没有办法直接从Erlang访问UNIX域套接字(例如/ var/run/dbus/system_bus_socket)而无需诉诸第三方驱动程序？

Answer 1

Erlang/OTP仅附带tcp和udp套接字的驱动程序.所以...

没有.

第三部分司机

• unixdom_drv在http://jungerl.sourceforge.net/
• 源树的驱动程序示例中的uds_dist
• procket at https://github.com/msantos/procket

Answer 2

在Erlang/OTP 19.0中,UNIX套接字现在可用,如自述文件中所述:

OTP-13572应用程序:erts,kernel

相关标识号:PR-612

*突出*

已经实现了对Unix域套接字的实验支持.如果您想尝试一下,请阅读相关信息.示例:gen_udp:open(0,[{ifaddr,{local,"/ tmp/socket"}}]).文档将在用户对实验API的反馈后编写.

例:

lsock.erl:

-module(lsock).
-export([watcher/1, test/0]).

watcher(Parent) -> 
  {ok, Sockin} = gen_udp:open(0, [{ifaddr, {local, "/tmp/testsockin"}}]),
  io:format("watcher ok? ~w ~w~n", [ok, Sockin]),
  Parent ! start,
  receive
    Msg -> io:format("watcher got: ~p ~n", [Msg]) end.

test() ->
  file:delete("/tmp/testsockin"),
  file:delete("/tmp/testsockout"),
  _ = spawn(lsock, watcher, [self()]),
  {ok, Sockout} = gen_udp:open(0, [{ifaddr, {local, "/tmp/testsockout"}}]),
  io:format("parent ok? ~w ~w~n", [ok, Sockout]),
  receive start ->
    gen_udp:send(Sockout, {local, "/tmp/testsockin"}, 0, "hi") end.

以下是其结果:

$ erlc lsock.erl 
$ erl
Erlang/OTP 19 [erts-8.0.1] [source-ca40008] [64-bit] [smp:2:2] [async-threads:10] [hipe] [kernel-poll:false]

Eshell V8.0.1  (abort with ^G)
1> lsock:test().
<0.58.0>
parent ok? ok #Port<0.455>
watcher ok? ok #Port<0.456>
watcher got: {udp,#Port<0.456>,{local,<<"/tmp/testsockout">>},0,"hi"} 
ok
2>