*
* tosend NONE null >=0 0 zero zero
* tosend timew null >=0 any nonzero zero
* tosend NONE null >=0 any nonzero zero
*
*
* tosend NONE null >=0 0 zero zero
* tosend timew null >=0 any nonzero zero
* tosend NONE null >=0 any nonzero zero
*
*
* child childw set >=0 irrelevant irrelevant irrelevant
* child NONE null >=0 irrelevant irrelevant irrelevant
*
* child childw set >=0 irrelevant irrelevant irrelevant
* child NONE null >=0 irrelevant irrelevant irrelevant
int maxfd, const fd_set *readfds,
const fd_set *writefds, const fd_set *exceptfds,
struct timeval now, int *r_r);
int maxfd, const fd_set *readfds,
const fd_set *writefds, const fd_set *exceptfds,
struct timeval now, int *r_r);