zmq + subprocess CLOEXEC test

import zmq
import sys
import os
import subprocess

context = zmq.Context()

print "parent", len(os.listdir("/proc/%i/fd" % os.getpid()))

print subprocess.check_output(
    [sys.executable, "-c",
     """import os; print "child", len(os.listdir("/proc/%i/fd" % os.getpid()))"""])

# output:
# parent 15
# child 15