[Tutor] Python equivalent of "kill -0 PID"

[Martin Walsh]

On 04/26/2012 02:24 PM, Sean Carolan wrote:
> In bash you can do this to see if a process is running:
> 
> [scarolan at kurobox:~/bin]$ kill -0 24275
> [scarolan at kurobox:~/bin]$ echo $?
> 0
> 
> Is there a python equivalent?  I tried using os.kill() but did not see
> any way to capture the output.

You might start with something like this ...

# python2.x
try:
    os.kill(24275, 0)
except OSError, e:
    if e.errno != 3: # 3 = No such process
        raise
    # process is not running, do something
else:
    # process is running, do something

It would seem os.kill returns nothing if the signal is sent
successfully, and will raise an exception if not.

HTH!
Marty