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I'm wondering if there is a gcc macro that will tell me the Linux kernel version so I can set variable types appropriately. If not, how would I go about defining my own macro that does this?
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To check Linux Kernel version, try the following commands: uname -r : Find Linux kernel version. cat /proc/version : Show Linux kernel version with help of a special file. hostnamectl | grep Kernel : For systemd based Linux distro you can use hotnamectl to display hostname and running Linux kernel version.
As to your question : the value of LINUX_VERSION_CODE comes from /usr/include/linux/version. h as a standard location.
So now,simply you can say Linux is a kernel. Linux + shell(Bash,Gnome etc) is a Linux distro say Ubuntu,Mint,Kali etc and each of them is a OS. Show activity on this post. "kernel" and "shell" are the original terms, as in let's say "core" and "shell".
The linux/version.h file has a macro called KERNEL_VERSION which will let you check the version you want against the current linux headers version (LINUX_VERSION_CODE) installed. For example to check if the current Linux headers are for kernel v2.6.16 or earlier:
#include <linux/version.h> #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,16) ... #else ... #endif A better way to get the version information at run-time is to use the utsname function in include/linux/utsname.h.
char *my_kernel_version = utsname()->release; This is essentially how /proc/version gets the current kernel verison.
Getting kernel version from linux kernel module at runtime
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