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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()