From: Eric Wong <normalperson@...>
Date: 2015-06-22T19:36:49+00:00
Subject: [ruby-core:69703] Re: [Ruby trunk - Feature #11139] [PATCH] socket: accept_nonblock supports "nonblock: false" kwarg

I don't think the flag matters for second-tier OSes, as the underlying
descriptor does not matter with our current APIs.

So better to leave the OS default if sock_nonblock kwarg is not
specified.