pollution: nfds
pollution: readfds
pollution: writefds
pollution: exceptfds
pollution: timeout
int select(int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, struct timeval *timeout); 

pollution: nfds
pollution: readfds
pollution: writefds
pollution: exceptfds
pollution: timeout
pollution: sigmask
int pselect(int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, const struct timespec *timeout, const sigset_t *sigmask);