Detect Linux Runlevel

[Wildman]

On Mon, 05 Dec 2016 21:42:52 -0600, Tim Chase wrote:

> On 2016-12-05 18:26, Wildman via Python-list wrote:
>> 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
>> 
>> 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.
> 
> This works based on my poking at it in both Py2 and Py3:

That works perfectly.  I owe you a big thanks.  That was a
lot of work and time on your part.  I really appreciate it.

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