+extern void tty_pre_select(TTY *t, fd_set *rfds, fd_set *wfds);
+extern int tty_get_status(TTY *t, TTY_Status *s);
+extern int tty_get_baud(TTY *t);
+extern void tty_set_baud(TTY *t, int rate);
+extern void tty_send_break(TTY *t);
+extern void tty_set_flow(TTY *t, int flow);
+extern void tty_hangup(TTY *t);
+extern void tty_winch(TTY *t, CRT_Pos size);
+extern void tty_parse_reset(Context *c);
+extern void tty_analyse(Context *c);
+extern TTY_Parser *tty_parser_new(void);
+extern void tty_parse(Context *c, uint8_t *buf, int len);
+/* keydis.c */
+extern KeyDis *keydis_vt102_new(void);
+extern KeyDis *keydis_ipc_new(Socket *s);
+extern int keydis_key(KeyDis *t, Context *c, int key);
+/* history.c */
+extern History *history_new(int n);
+extern void history_free(History *h);
+extern void history_add(History *h, CRT_CA *c);
+/* ring.c */
+extern int ring_read(Ring *r, void *b, int n);
+extern int ring_write(Ring *r, void *b, int n);
+extern int ring_space(Ring *r);
+extern int ring_bytes(Ring *r);
+extern Ring *ring_new(int n);
+/* ptty.c */
+extern TTY *ptty_open(char *path, char *argv[], CRT_Pos *size);
+/* terminal.c */
+extern int terminal_winches;
+extern void terminal_atexit(void);
+extern void terminal_getsize(TTY *_t);
+extern void terminal_dispatch(void);
+extern void terminal_register_handlers(void);
+extern TTY *terminal_open(int rfd, int wfd);
+/* util.c */
+extern int wrap_read(int fd, void *buf, int len);
+extern int wrap_write(int fd, void *buf, int len);
+extern void set_nonblocking(int fd);
+extern void set_blocking(int fd);
+extern void default_termios(struct termios *termios);
+extern void client_termios(struct termios *termios);
+extern int fput_cp(FILE *f, uint32_t ch);
+/* log.c */
+extern Log *file_log_new(char *fn);
+extern void log_f(Log *log, char *fmt, ...);
+/* ipc.c */
+extern IPC_Msg *ipc_check_for_message_in_slide(Slide *s);
+extern void ipc_consume_message_in_slide(Slide *s);
+extern int ipc_msg_send(Socket *s, IPC_Msg *m);
+extern int ipc_msg_send_debug(Socket *s, char *msg);
+extern int ipc_msg_send_history(Socket *s, History_ent *l);
+extern int ipc_msg_send_vt102(Socket *s, VT102 *v);
+extern int ipc_msg_send_key(Socket *s, int key);
+extern int ipc_msg_send_term(Socket *s, void *buf, int len);
+extern int ipc_msg_send_status(Socket *s, char *buf);
+extern int ipc_msg_send_setbaud(Socket *s, int baud);
+extern int ipc_msg_send_sendbreak(Socket *s);
+extern int ipc_msg_send_setflow(Socket *s, int flow);
+extern int ipc_msg_send_setansi(Socket *s, int ansi);
+extern int ipc_msg_send_hangup(Socket *s);
+extern int ipc_msg_send_setsize(Socket *s, CRT_Pos size);
+extern int ipc_msg_send_reset(Socket *s);
+/* slide.c */
+extern void slide_free(Slide *s);
+extern void slide_consume(Slide *s, int n);
+extern void slide_added(Slide *s, int n);
+extern Slide *slide_new(int n);
+extern void slide_expand(Slide *s, int n);
+/* symsocket.c */
+extern int wrap_recv(int fd, void *buf, int len);
+extern int wrap_send(int fd, void *buf, int len);
+extern void socket_free(Socket *s);
+extern void socket_free_parent(Socket *s);
+extern Socket *socket_listen(char *path);
+extern Socket *socket_accept(Socket *l);
+extern Socket *socket_connect(char *path);
+extern void socket_consume_msg(Socket *s);
+extern void socket_pre_select(Socket *s, fd_set *rfds, fd_set *wfds);
+extern int socket_post_select(Socket *s, fd_set *rfds, fd_set *wfds);
+extern int socket_write(Socket *s, void *buf, int len);
+/* serial.c */
+extern TTY *serial_open(char *path, int lock_mode);
+/* cmd.c */
+extern int cmd_parse(Cmd *c, Context *ctx, char *buf);
+extern void cmd_show_status(Cmd *c, Context *ctx);
+extern int cmd_key(Cmd *c, Context *ctx, int key);
+extern int cmd_activate(Cmd *c, Context *ctx);
+extern void cmd_new_status(Cmd *c, Context *ctx, char *msg);
+extern Cmd *cmd_new(void);
+/* lockfile.c */
+extern Filelist *filelist_new(void);
+extern void filelist_remove(Filelist *fl, Filelist_ent *fle);
+extern void filelist_add(Filelist *fl, char *fn);
+extern void filelist_free(Filelist *fl);
+extern void filelist_print(Filelist *fl, FILE *f);
+extern int lockfile_make(char *name);
+extern void lockfile_add_places(Filelist *fl, char *leaf);
+extern void lockfile_regularize_and_add(Filelist *fl, char *leaf);
+extern void lockfile_add_name_from_path(Filelist *fl, char *file);
+extern void lockfile_add_name_from_dev(Filelist *fl, dev_t dev);
+extern void lockfile_check_dir_for_dev(Filelist *fl, char *dir, dev_t dev);
+extern Filelist *lockfile_make_list(char *device);
+extern void lockfile_remove_stale(Filelist *fl);
+extern Filelist *lockfile_lock(Filelist *fl);
+extern void lockfile_unlock(Filelist *fl);
+extern int serial_lock_check(Serial_lock *l);
+extern void serial_lock_free(Serial_lock *l);
+extern Serial_lock *serial_lock_new(char *dev, int mode);
+/* utf8.c */
+extern void utf8_flush(Context *c);
+extern void utf8_parse(Context *c, uint32_t ch);
+extern UTF8 *utf8_new(void);
+extern int utf8_encode(char *ptr, int ch);
+extern void utf8_emit(TTY *t, int ch);
+/* vt102_charset.c */
+extern uint32_t vt102_charset_c0[VT102_CHARSET_SIZE];
+extern uint32_t vt102_charset_us[VT102_CHARSET_SIZE];
+extern uint32_t vt102_charset_uk[VT102_CHARSET_SIZE];
+extern uint32_t vt102_charset_vt52[VT102_CHARSET_SIZE];
+extern uint32_t vt102_charset_gl[VT102_CHARSET_SIZE];
+extern uint32_t *charset_from_csid[];