python 后台运行

def createDaemon():
try:
if os.fork() >0:
os._exit(0)
except OSError as error:
err_msg = "fork #1 failed: %d (%s)" %(error.errno, error.strerror)
logging.error(err_msg)
os._exit(1)
os.chdir('/')
os.setsid()
os.umask(0)
try:
pid = os.fork()
if pid > 0:
msg = "Daemon PID %d" %pid
logging.error(msg)
os._exit(0)
except OSError as error:
err_msg = "fork #2 failed %d (%s)" %(error.errno, error.strerror)
logging.error(err_msg)
os._exit(1)
while 1:
处理逻辑