Listen on unix socket in debugger

[3y3]

Is there any limitation to not listen on unix sockets in debugger?
If you don't know any limitations then I can try to implement this feature.

[bnoordhuis]

There are no real technical obstacles but what is the use case? Let me rephrase: when is a TCP socket not good enough?

[3y3]

For example:
We have remote server with development environment. Server used by some users in one time.
If we try to start debugger on port 5858, it can cause EADDRINUSE. So we need to find free port to debug our app.
Instead of this we can start debugger to listen on socket in our home dir and be sure what we can listen on it.

[bnoordhuis]

I have a patch in the works (#5025) that makes --debug-port=0 bind to a random port, would that help? It's perhaps less convenient because you'll need to parse stderr or query process.debugPort. OTOH, you don't get stale socket errors like you do with UNIX sockets.

[3y3]

--debug-port=0 sounds like a dream. Is this work correctly with child_process?

[bnoordhuis]

Yes, it does.