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?
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.