Python - create daemon (See related posts)

def createDaemon():
	'''Funzione che crea un demone per eseguire un determinato programma...'''
	
	import os
	
	# create - fork 1
	try:
		if os.fork() > 0: os._exit(0) # exit father...
	except OSError, error:
		print 'fork #1 failed: %d (%s)' % (error.errno, error.strerror)
		os._exit(1)

	# it separates the son from the father
	os.chdir('/')
	os.setsid()
	os.umask(0)

	# create - fork 2
	try:
		pid = os.fork()
		if pid > 0:
			print 'Daemon PID %d' % pid
			os._exit(0)
	except OSError, error:
		print 'fork #2 failed: %d (%s)' % (error.errno, error.strerror)
		os._exit(1)

	funzioneDemo() # function demo
	
def funzioneDemo():

	import time

	fd = open('/tmp/demone.log', 'w')
	while True:
		fd.write(time.ctime()+'\n')
		fd.flush()
		time.sleep(2)
	fd.close()
	
if __name__ == '__main__':

	createDaemon()