Python监视进程

由subprocess创建一个进程，然后进行监视
每一秒钟查看一次，如果正在运行，打印pid和running，如果已停止，,继续执行任务并打印Termined
shell和stdout均设置为False
也许这对做病毒的守护进程很好
#!/usr/bin/env python
import subprocess , sys , time
p=subprocess.Popen(['ping','127.0.0.1','-n','10'], shell=False,stdout=False)
while 1:
    time.sleep(1)
    ret=subprocess.Popen.poll(p)
    if ret is None:
        print p.pid,"running"
    else:
        print "Termined!"
        p=subprocess.Popen(['ping','127.0.0.1','-n','10'], shell=False,stdout=False)