[erlang-questions] connect to existing unix socket

[Joe K]

Silly me, I should've just opened the socket with a different path.

```
{ok, Sock} = gen_udp:open(0, [binary, {ip, {local, <<"/home/vagrant/erl.sock">>}}]).
gen_udp:send(Sock2, {local, <<"/home/vagrant/janus.sock">>}, 0, <<"{}">>).
```

worked fine -- Janus is happy.

> On Nov 11, 2018, at 5:01 PM, Joe K <goodjoe2049@REDACTED> wrote:
> 
> If I start Janus with SOCK_DGRAM and use the following from Erlang
> 
> 1> {ok, Sock} = gen_udp:open(0, [local]).
> {ok,#Port<0.6>}
> 2> gen_udp:send(Sock, {local, <<"/home/vagrant/janus.sock">>}, 0, "{}").
> ok
> then I see 
> 
> Unix Sockets thread started
> [WARN] Dropping packet from unknown source (no path provided)
> in Janus logs.
> 
>> On Nov 11, 2018, at 4:43 PM, Joe K <goodjoe2049@REDACTED <mailto:goodjoe2049@REDACTED>> wrote:
>> 
>> tl;dr
>> 
>> How can I avoid:
>> 
>> ```
>> 1> gen_udp:open(0, [binary, {ip, {local, <<"/home/vagrant/janus.sock">>}}]).
>> {error,eaddrinuse}
>> ```
>> 
>> ---
>> 
>> I have a janus gateway (https://github.com/meetecho/janus-gateway <https://github.com/meetecho/janus-gateway>) running on the same host as my Erlang app and I want to be able to make them talk via a unix socket. Janus creates a SOCK_SEQPACKET or SOCK_DGRAM unix socket on startup and I want to be able to connect to it from Erlang. The problem is, when I set Janus to use SOCK_DGRAM, I can't then open it from Erlang:
>> 
>> ```
>> 1> gen_udp:open(0, [binary, {ip, {local, <<"/home/vagrant/janus.sock">>}}]).
>> {error,eaddrinuse}
>> ```
>> 
>> and if I set Janus to use SOCK_SEQPACKET, gen_tcp fails for me as well:
>> 
>> ```
>> 2> gen_tcp:connect({local, <<"/home/vagrant/janus.sock">>}, 0, [local]).
>> {error,eprototype}
>> ```
>> 
>> What am I doing wrong?
> 

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