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"""daemonize function from twisted.scripts._twistd_unix."""

#-----------------------------------------------------------------------------

# Copyright (c) Twisted Matrix Laboratories.

# See Twisted's LICENSE for details.

# http://twistedmatrix.com/

#-----------------------------------------------------------------------------

import os, errno

def daemonize():

# 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.

null = os.open('/dev/null', os.O_RDWR)

for i in range(3):

try:

os.dup2(null, i)

except OSError as e:

if e.errno != errno.EBADF:

raise

os.close(null)