def daemonize():
    """Detach from the terminal and continue as a daemon"""
    # swiped from twisted/scripts/twistd.py
    # See http://www.erlenstar.demon.co.uk/unix/faq_toc.html#TOC16
    if os.fork():   # launch child and...
        os._exit(0) # kill off parent
    os.setsid()
    if os.fork():   # launch child and...
        os._exit(0) # kill off parent again.
    os.umask(077)
    null=os.open('/dev/null', os.O_RDWR)
    for i in range(3):
        try:
            os.dup2(null, i)
        except __HOLE__, e:
            if e.errno != errno.EBADF:
                raise
    os.close(null)
dataset/ETHPy150Open kiberpipa/Intranet/pipa/ltsp/src/ltsp_usage_monitor/daemon.py/daemonize