#define _GNU_SOURCE
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <inttypes.h>
int main(void)
{
struct {
struct file_handle fh;
uint64_t cgroup_id;
} handle;
int mount_id;
name_to_handle_at(AT_FDCWD, "/", &handle.fh, &mount_id, 0);
return 0;
}