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 demodef 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()