How to know which programming model is used on may Linux machine

[Dave Hylands]

Hi Pritam,

On Wed, Jul 25, 2012 at 4:01 AM, Pritam Bankar
<pritambankar1988 at gmail.com> wrote:
> Hi,
>
> AFAIK there are three programming model that can be chosen on 64 bit
> environment. These models are LP64, ILP64, LLP64
>
> Question 1)  But how can I know which model is used on my system ?

Write a little program to print the sizes of the various types which
distinguish the models. Something like:

#include <stdio.h>
int main(int argc, char **argv)
{
    printf("sizeof(int) = %zu\n", sizeof(int));
    printf("sizeof(long) = %zu\n", sizeof(long));
    printf("sizeof(void *) = %zu\n", sizeof(void *));
    return 0;
}

which, when run on my 64-bit system produces:

sizeof(int) = 4
sizeof(long) = 8
sizeof(void *) = 8

which according to http://www.unix.org/version2/whatsnew/lp64_wp.html
makes it an LP64 model.

> Question 2) Does long long data type is limited for LLP64 type model ?

I think that their table means that its 64 bits for all.

-- 
Dave Hylands
Shuswap, BC, Canada
http://www.davehylands.com