python实现的守护进程(Daemon)用法实例

本文实例讲述了python实现的守护进程(Daemon)用法。分享给大家供大家参考。具体如下：

    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()

希望本文所述对大家的Python程序设计有所帮助。