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Python - create daemon

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  1. def createDaemon():
  2. 	'''Funzione che crea un demone per eseguire un determinato programma...'''
  3.  
  4. 	import os
  5.  
  6. 	# create - fork 1
  7. 	try:
  8. 		if os.fork() > 0: os._exit(0) # exit father...
  9. 	except OSError, error:
  10. 		print 'fork #1 failed: %d (%s)' % (error.errno, error.strerror)
  11. 		os._exit(1)
  12.  
  13. 	# it separates the son from the father
  14. 	os.chdir('/')
  15. 	os.setsid()
  16. 	os.umask(0)
  17.  
  18. 	# create - fork 2
  19. 	try:
  20. 		pid = os.fork()
  21. 		if pid > 0:
  22. 			print 'Daemon PID %d' % pid
  23. 			os._exit(0)
  24. 	except OSError, error:
  25. 		print 'fork #2 failed: %d (%s)' % (error.errno, error.strerror)
  26. 		os._exit(1)
  27.  
  28. 	funzioneDemo() # function demo
  29.  
  30. def funzioneDemo():
  31.  
  32. 	import time
  33.  
  34. 	fd = open('/tmp/demone.log', 'w')
  35. 	while True:
  36. 		fd.write(time.ctime()+'\n')
  37. 		fd.flush()
  38. 		time.sleep(2)
  39. 	fd.close()
  40.  
  41. if __name__ == '__main__':
  42.  
  43. 	createDaemon()

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