[dirt simple comms] read bytes from stdin and write them to a named pipe. read bytes from another named pipe and write them to stdout.

stdinout_tofrom_named_pipe.py

#!/usr/bin/env python

import thread, sys, time
if sys.argv[1] == "other":
	fifo_w = open('/tmp/south', 'wb')
	fifo_r = open('/tmp/north', 'rb')
	log = open('/tmp/serial_log_southbound', 'wb')
else: 
	fifo_r = open('/tmp/south', 'rb')
	fifo_w = open('/tmp/north', 'wb')
	log = open('/tmp/serial_log_northbound', 'wb')

def read_from_stdin():
	f = sys.stdin
	while True:
		b = f.read(1)
		if len(b) == 1:
			fifo_w.write(b)
			fifo_w.flush()
			log.write(b)
			log.flush()

def write_to_stdout():
	while True:
		b = fifo_r.read(1)
		if len(b) == 1:
			sys.stdout.write(b) # instead of print() to avoid printing CRLF
			sys.stdout.flush()

thread.start_new_thread(read_from_stdin, ())
thread.start_new_thread(write_to_stdout, ())

time.sleep(120) # TODO: replace w/ threading module and join()