Is there some way to detect run
levels programmatically? I see
no library functions or system
calls that return information
about the current system run
level. Have I missed something?

Thx,



dk

What are you trying to do?

Run levels are a pretty nebulous thing in general;
SMF in Solaris 10 talks about services and dependancies....

- Bart

Dan Koren wrote:
> Is there some way to detect run
> levels programmatically? I see
> no library functions or system
> calls that return information
> about the current system run
> level. Have I missed something?

Run "who -r". Its output will tell you the run level.

If you need to do this from some compiled language,
you can use popen() and then parse the output yourself.

From the shell, it's pretty easy: just do something like this:

runlevel ()
{
set `who -r`
echo "$3"
}

Then you can do

echo "The runlevel is `runlevel`."

Also, if you do "truss who -r", it seems to read /var/adm/utmpx
and read /etc/inittab. So, you might be able to do something
involving reading /var/adm/utmpx by calling getutxent(). However,
it seems safer to just read the output of "who -r" to me...

- Logan

OK, thanks.


dk


"Logan Shaw" <lshaw-usenet@austin.rr.com> wrote in message
news:KVP0e.29568$Ux.3522@tornado.texas.rr.com...
> Dan Koren wrote:
>> Is there some way to detect run
>> levels programmatically? I see
>> no library functions or system
>> calls that return information
>> about the current system run
>> level. Have I missed something?
>
> Run "who -r". Its output will tell you the run level.
>
> If you need to do this from some compiled language,
> you can use popen() and then parse the output yourself.
>
> From the shell, it's pretty easy: just do something like this:
>
> runlevel ()
> {
> set `who -r`
> echo "$3"
> }
>
> Then you can do
>
> echo "The runlevel is `runlevel`."
>
> Also, if you do "truss who -r", it seems to read /var/adm/utmpx
> and read /etc/inittab. So, you might be able to do something
> involving reading /var/adm/utmpx by calling getutxent(). However,
> it seems safer to just read the output of "who -r" to me...
>
> - Logan

<barts@smaalders.net> wrote in message
news:1111736443.771703.165190@l41g2000cwc.googlegr oups.com...
>
> What are you trying to do?


Somewhat devious things as usual.

>
> Run levels are a pretty nebulous thing in general;


Got that...



dk

> Is there some way to detect run
> levels programmatically? I see
> no library functions or system
> calls that return information
> about the current system run
> level. Have I missed something?

How about `who -r`?

Hi Dan

> Is there some way to detect run
> levels programmatically? I see
> no library functions or system
> calls that return information
> about the current system run
> level. Have I missed something?
As Logan Shaw described,
man 4 utmp
and
man 3c getut
should be good starting points.

Pay attention: This tells you in which runlevel the system should(!) to
be. Not whether all rc-scripts and inittab-stuff worked fine (which is
the finally essential thing!).

Florian