fifot.py

#! /usr/bin/env python

import gevent.monkey; gevent.monkey.patch_all()
import gevent, fcntl, os


def doit():
    count = 0
    while 1:
        count += 1
        print count
        gevent.sleep(1)

f = open("bla")
fcntl.fcntl(f.fileno(), fcntl.F_SETFL, os.O_NONBLOCK)
gevent.spawn(doit)

while 1:
    gevent.socket.wait_read(f.fileno())
    d = os.read(f.fileno(), 4096)
    if not d:
        break
    print repr(d)