fd_set_ent_t mask = 1 << (fd % 16);
fdsetp->flags[fd/16] |= mask;
}
-static inline int FD_ISSET(int fd, fd_set *fdsetp)
+static inline int FD_ISSET(int fd, const fd_set *fdsetp)
{
if(fd < 0 || fd > FD_SETSIZE) return 0;
fd_set_ent_t mask = 1 << (fd % 16);