topic Re: chatr and C++ in Operating System - Linux

chatr and C++

VanderstraetenJ — Mon, 20 Nov 2006 04:58:40 GMT

Hi,
I work on HP-UX B11.11 plateforms and I've used the chatr command on a binary file in order to use the third quadrant as data space.
'chatr +q3p enable name_fo_the_binary'

I would like to get, in a C/C++ software, the value of the theorical data space accessible for this process (I saw on the man that when you enable the third quadrant, this value is increased from 1.9GB to 2.85GB)

Is there any way to get this value on a C/C++ software ?

Thanks,

Julien V

Re: chatr and C++

Peter Godron — Mon, 20 Nov 2006 05:41:34 GMT

Julien,
I don't know of a direct command, but how about mallocing space until loop fails?

Re: chatr and C++

VanderstraetenJ — Mon, 20 Nov 2006 07:29:51 GMT

Thanks for the answer but I can't use this solution... I don't find it very "clean" and I must respect a lot of constraints and more precisely, time constraints...

I think that a C/C++ function (like tuneinfo that allow to get a lot of system tunable parameters), if it exists, should give best time performs and is really the best solution for me.

Julien

Re: chatr and C++

Peter Godron — Mon, 20 Nov 2006 08:58:46 GMT

Hi,
please see James's answer in :
http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=72276

His program will display the data space used for a specific id of a RUNNING process. I am sure you could adapt his code.

If you enabled the 3rd quadrant, you already stated how much data space increases to, so why do you want to check in your program.

Please also read on a general note:
http://forums1.itrc.hp.com/service/forums/helptips.do?#33 on how to reward the answers given to your questions.

Re: chatr and C++

VanderstraetenJ — Mon, 20 Nov 2006 09:34:05 GMT

Although I know the value I want to check in my program the theorical accessible data space because I need to make a 'generic' algorithm that can be used on similar (but not exactly the same) case (it will be include in a kind of toolbox).

I'm searching around the James' answers since this morning but I don't find what I really search...

Perhaps I'm too tired... ;-)

Thanks again,

Julien

Re: chatr and aC++

Dennis Handly — Mon, 08 Sep 2014 11:00:05 GMT

I assume you know that you must link with -N in order to get the 1.9 GB?

And on IPF you must link with -N to even use chatr +as mpas?