suseconds_t
D(suseconds_t)
const suseconds_t txop_interval = 100 * 1000; /* 100 msec, in usec */
suseconds_t tv_usec; /* and microseconds */
suseconds_t tv_usec; /* and microseconds */
suseconds_t tv_usec; /* and microseconds */
tim.it_value.tv_usec = (suseconds_t)(iv * 1000000UL);