[Tutor] why "ifconfig" is alway running?

[Alan Gauld]

"lei yang" <yanglei.fage at gmail.com> wrote

> def runForAWhile(cmd, secs=10):
>    proc = subprocess.Popen(cmd, stdout=subprocess.PIPE,
> 
> stderr=subprocess.STDOUT, shell=True)
>    status = proc.poll()
>    start = datetime.datetime.now()
>    while (status is None and
                (datetime.datetime.now() - start) <   timeout): #not 
timed out
>              print status
>    if 0 == status:
>      print("'%s' is program exited" %cmd)
>   else:
>      try:
>          os.kill(proc.pid, signal.SIGINT)

> why it print many "None" in 10 second. which means "ifconfig" is
> running in 10sec, why, what's wrong withi my script,

You only check the status once *before* entering the while loop.
You need another status check inside the loop.

> I just want to let my programe running, if it's timeout(10sec), kill 
> it

Its not clear from your mail if you have checked whether the
process really is running - using the OS commands 'top' or 'ps'
for example or whjether its just the None result you are concerned
about. But try updating status first...

HTH,


-- 
Alan Gauld
Author of the Learn to Program web site
http://www.alan-g.me.uk/