static inline void readkmem (void *m,unsigned off,int sz) 
{
         if (lseek64(kmem,(unsigned long long) off,0)!=off){
                 perror("kmem lseek"); exit(2);
         }
         if (read(kmem,m,sz)!=sz) {
                 perror("kmem read"); exit(2);
         }
 }