ptimeout_get_tsp
ret = ppoll(*pfdp, *npfd_activep, ptimeout_get_tsp(&timeout), sigsetp);
r = ppoll(&pfd, 1, ptimeout_get_tsp(&timeout),
struct timespec *ptimeout_get_tsp(struct timespec *pt);
ret = ppoll(*pfdp, *npfd_activep, ptimeout_get_tsp(&timeout), sigsetp);
result = ppoll(pfd, npfd, ptimeout_get_tsp(&timeout), &osigset);