bool fdset_contains(FDSet *s, int fd);
int fdset_remove(FDSet *s, int fd);
-int fdset_new_array(FDSet **ret, const int *fds, unsigned n_fds);
+int fdset_new_array(FDSet **ret, const int *fds, size_t n_fds);
int fdset_new_fill(FDSet **ret);
int fdset_new_listen_fds(FDSet **ret, bool unset);