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linuxunixarchitecture
Boris
Boris

Reputation: 369

Determine dynamically linux OS architecture

Is there is a way to know dynamically Linux architecture, whether it x86-64 or x86?

Upvotes: 0

Views: 505

Answers (3)

Basile Starynkevitch
Basile Starynkevitch

Reputation: 1

The Posix standard uname function (implemented in the uname(2) syscall) is dynamically giving you the information about the CPU. You probably want the machine field.

Caution about x86-64 kernels running a 32 bit program (e.g. a 32 bits Debian distribution chroot-ed in a 64 bits Debian, or perhaps a 32 bits ELF binary running on a 64 bits system); I have no idea what they give in that situation; I would imagine some x86_64 in that case, since the kernel does not really know about the binaries and libc of the system.

See also the Linux specific personality(2) syscall.

Upvotes: 4

Mihai8
Mihai8

Reputation: 3147

You can use lscpu command to list characteristics about CPU.

Upvotes: 0

Nicholas Wilson
Nicholas Wilson

Reputation: 9685

Google is your friend: http://sourceforge.net/p/predef/wiki/Architectures/

You want to test for the macros __amd64__ and __i386__. Ideally, you don't test the macros at all and write correct, portable code.

Upvotes: 1

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