topic Re: How to know 64 bit or 32 bit in Operating System - Linux

How to know 64 bit or 32 bit

CA1490051 — Mon, 30 Jul 2007 03:31:34 GMT

Hi all,

Can i know how to find out a HP-UX machine is 32 bit or a 64 bit machine. Is there any command for that.

Even if it is not a HP machine can i write a code snippet to find out whether i am using 32 bit machine or a 64 bit machine.

thanks in advance
Vikram

Re: How to know 64 bit or 32 bit

Oviwan — Mon, 30 Jul 2007 03:35:06 GMT

Hey

type:
$getconf KERNEL_BITS

output will be 32 or 64

Regards

Re: How to know 64 bit or 32 bit

Anshumali — Mon, 30 Jul 2007 03:35:19 GMT

Hi,

You can use
getconf KERNEL_BITS
it will give you the O/P which you need.....

Re: How to know 64 bit or 32 bit

James R. Ferguson — Mon, 30 Jul 2007 06:18:23 GMT

Hi Vikram:

# getconf KERNEL_BITS

...will tell you the "bitness" of your current kernel, e.g. "64"

# getconf HW_CPU_SUPP_BITS

...will tell you the "bitness" your hardware will support, e.g. "32/64"

# file filename

...will return:

"ELF-64 executable object file - PA-RISC 2.0 (LP64)" for a 64bit codefile, otherwise something like:

"PA-RISC1.1 shared executable" for a 32bit one.

Regards!

...JRF...

Re: How to know 64 bit or 32 bit

Robert-Jan Goossens — Mon, 30 Jul 2007 07:42:40 GMT

Hi Vikram,
---
Even if it is not a HP machine can i write a code snippet to find out whether i am using 32 bit machine or a 64 bit machine.
---

You mean if is not hpux.

Linux
# getconf LONG_BIT
32

AIX
# bootinfo -K
64

Solaris
# isainfo -kv
64-bit sparcv9 kernel modules

Regards,
Robert-Jan

Re: How to know 64 bit or 32 bit

CA1490051 — Mon, 30 Jul 2007 08:14:13 GMT

Hi every one

Thank you very much for the reply.

This definitely solved my problem. But one thing i want to ask here for curiosity.

Can i write a code in C to tell this

for ex- to know a machine is little endian or big endian i can write like this.

union {
int Var;
char One;
}endian;

main ()
{
endian end;
end.Var = 0x01;
printf("%c",end.One);
}

thanks and regards
Vikram

Re: How to know 64 bit or 32 bit

Dennis Handly — Sun, 25 Sep 2011 19:51:07 GMT

>Can I write a code in C to tell this

You can only write a program to tell what size the current program is, not the kernel.

For HP-UX, you could test a define:
#ifdef __LP64__

Or for general LP64 machines:
#include <stdio.h>
int main() {
printf("size of void*: %d\n", (int)sizeof(void*));
return 0;
}