def bounce(in1, out1, in2, out2, timeout=nil)
	buf1 = ''
	buf2 = ''
	loop do
		rd = []
		wr = []
		
		rd << in1  if buf1.length < 1024*16
		rd << in2  if buf2.length < 1024*16

		wr << out1 if buf1.length > 0
		wr << out2 if buf2.length > 0
		
		rd, wr = IO.select(rd, wr, nil, (Integer(timeout) rescue nil))
		
		break unless rd
		
		case rd[0]
		when in1
#			str = in1.readpartial 1 rescue nil
			str = in1.read 1 rescue nil
			break unless str
			buf1 << str
		when in2
#			str = in2.readpartial 1 rescue nil
			str = in2.read 1 rescue nil
			break unless str
			buf2 << str
		end
		
		case wr[0]
		when out1
			len = out1.write buf1
			buf1[0...len] = ''
		when out2
			len = out2.write buf2
			buf2[0...len] = ''
		end
	end
end