trap_exists and cowboy ws

[Roberto Ostinelli]

All,

I'm experiencing a situation where a process spawned after a cowboy websocket handler upgrade request in init/2 has the process flag trap_exit set to true, without me doing anything to set it.

This happens in Elixir, not sure if this is related.

def websocket_init(_state) do
    Logger.info("was trapping? #{Process.flag(:trap_exit, true)}")

=> this prints "was trapping? true"

Is this expected behaviour?

Thank you,

r.

[Loïc Hoguin]

Hey,

It's expected because connection processes also act as supervisors, but
there's no reason it should trap exits once the connection has switched
to Websocket. Please open a ticket or PR to make the connection switch
back to NOT trapping exits when switching to Websocket.

Cheers,

--
Loïc Hoguin
https://ninenines.eu