int select_intr(int n, fd_set *r, fd_set *w, fd_set *e, struct timeval *t);
int uh_tcp_send(struct client *cl, const char *buf, int len);
int select_intr(int n, fd_set *r, fd_set *w, fd_set *e, struct timeval *t);
int uh_tcp_send(struct client *cl, const char *buf, int len);