Detect Linux Runlevel

Wildman best_lay at yahoo.com
Mon Dec 5 19:26:51 EST 2016


On Mon, 05 Dec 2016 16:08:57 -0600, Tim Chase wrote:

> On 2016-12-05 14:58, Wildman via Python-list wrote:
>> I there a way to detect what the Linux runlevel is from
>> within a Python program?  I would like to be able to do
>> it without the use of an external program such as 'who'
>> or 'runlevel'.
> 
> You can use something like
> 
> https://gist.github.com/likexian/f9da722585036d372dca
> 
> to parse the /var/run/utmp contents.  Based on some source-code
> scrounging, it looks like you want the first field to be "1" for the
> "runlevel" account.  To extract the actual runlevel, you can take
> the PID value from the second column ("53" in my example here) and
> take it's integer value mod 256 (AKA "& 0xff") to get the character
> value.  So chr(int("53") & 0xff) returns "5" in my case, which is my
> runlevel.
> 
> Additional links I found helpful while searching:
> 
> https://casper.berkeley.edu/svn/trunk/roach/sw/busybox-1.10.1/miscutils/runlevel.c
> https://github.com/garabik/python-utmp
> 
> -tkc

That is exactly the kind of thing I was looking for.  Thank you.
Now all I have to do is get it to work with Python3.

-- 
<Wildman> GNU/Linux user #557453
The cow died so I don't need your bull!


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