import socket
import threading
import time
import random
import fcntl,os

# this function a client that waits for 1 second and then says "hi"
def openconnection():
  c = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
  c.connect(addr)
  time.sleep(1)
  c.send('hi')

# listen for connections
addr = ('127.0.0.1',random.randint(1025,65531))
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind(addr)
s.listen(5)
# This timeout is the key.   Even though it is much longer than the code will
# execute, removing it will fix the problem.
s.settimeout(10)

# start the client in 1 second...
t1 = threading.Timer(1, openconnection)
t1.start()

# get a connection
(a,host) = s.accept()

# Python thinks that a is a blocking socket.   On Mac / BSD, the OS disagrees
print 'a has timeout:',a.gettimeout()
print 'O_NONBLOCK is set:',(fcntl.fcntl(a.fileno(), fcntl.F_GETFL)&os.O_NONBLOCK) !=0


# do a send in .1 second (give the recv below a chance to run)
t2 = threading.Timer(.1, a.send,args=("hello",))
t2.start()
  
message = a.recv(1024)
print 'received:',message
a.close()