class IO::Stream::Buffered

def sysread(size, buffer)
	# Come on Ruby, why couldn't this just return `nil`? EOF is not exceptional. Every file has one.
	while true
		result = @io.read_nonblock(size, buffer, exception: false)
		
		case result
		when :wait_readable
			@io.wait_readable(@io.timeout) or raise ::IO::TimeoutError, "read timeout"
		when :wait_writable
			@io.wait_writable(@io.timeout) or raise ::IO::TimeoutError, "write timeout"
		else
			return result
		end
	end
rescue Errno::EBADF
	raise ::IOError, "stream closed"
end