/* The following definitions come from lib/util/select.c */
void sys_select_signal(char c);
-int sys_select(int maxfd, fd_set *readfds, fd_set *writefds, fd_set *errorfds, struct timeval *tval);
-int sys_select_intr(int maxfd, fd_set *readfds, fd_set *writefds, fd_set *errorfds, struct timeval *tval);
int sys_poll(struct pollfd *fds, int num_fds, int timeout);
int sys_poll_intr(struct pollfd *fds, int num_fds, int timeout);