impossible unix domain socket error

[ORESoftware]

I am on Node.js 12 on linux. This code is working on my Mac, so definitely some discrepancies between the machine and or the libraries used for linux or something.

So I have this:

const udsFile = '/home/oleg/.bunion/sockets/1564793353887444414.sock';

try {
    fs.unlinkSync(udsFile);
}
catch (e) {
    console.error(e);  // Error: ENOENT: no such file or directory, unlink '/home/oleg/.bunion/sockets/1564793353887444414.sock'  (this is fine)
}

server.listen(udsFile, () => {   // synchronously raised error here

    console.log('Listening on unix domain socket:', udsFile);

});

and then I get this synchronous error which is raised synchronously when server.listen is called:

Error: listen EADDRINUSE: address already in use /home/oleg/.bunion/sockets/1564793353887444414.sock

this makes no sense..my only guess is that the server.listen API is different on Mac vs Linux?

Another thing - server.listen doesn't seem to be async here, the error that's raised is synchronous, so that seems like a weird thing in Node.js-land?

[ORESoftware]

update, so it doesn't appear that the error is raised synchronously - and when I added this:

server.on('error', e => {
  consumer.warn(e);
});

now it seems to work? very strange

[ORESoftware]

so what was happening is that more than one process was trying to create the file and one was failing, the other was succeeding, my mistake :(