Determine dynamically linux OS architecture

Question

有没有办法动态了解Linux体系结构，无论是x86-64还是x86 ？

Answer 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 (eg 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.

Answer 2

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.

Answer 3

您可以使用lscpu命令列出有关CPU的特征。