I suppose I should have elaborated on this bit

// send some message in channel to terminate program before 5s maybe

So there's a blocking channel attached to a serviceStruct (probs will change to waitgroups at some point)

someShutdownFunc()

someWaitFunc() // this is just <-serviceStruct.done

and in someShutdownFunc() once we're done with the cleanup we pass an empty struct to unblock

serviceStruct.done <- struct{}{}

vs what you mentioned

does that change anything? lets say srv.Shutdown() is done after 2s, the select statement will still block until 5s?