#include <stdio.h>
#include <stdlib.h>
#include <sys/sysctl.h>
#include <linux/sysctl.h>
#include <linux/version.h>

#if LINUX_VERSION_CODE < 0x020120
#error "This program needs linux-2.1.32 or newer to compile"
#endif

int main(int argc, char **argv)
{
	int name[] = {CTL_KERN, KERN_PRINTK};
        int namelen = 2;
	int oldval[8];  /* 4 would suffice */
	size_t len = sizeof(oldval);
	int i, error;


	error = sysctl (name, namelen, (void *)oldval, &len,
		NULL /* newval */, 0 /* newlen */);
	if (error) {
		fprintf(stderr,"%s: sysctl(): %s\n",
			argv[0],strerror(errno));
		exit(1);
	}
	printf("len is %i bytes\n", len);
	for (i = 0; i < len/(sizeof(int)); i++)
		printf("%i\t", oldval[i]);
	printf("\n");
	exit(0);
}