+/* --- @a_listen@ --- *
+ *
+ * Arguments: @const char *name@ = socket name to create
+ * @uid_t u@ = user to own the socket
+ * @gid_t g@ = group to own the socket
+ * @mode_t m@ = permissions to set on the socket
+ *
+ * Returns: Zero on success, @-1@ on failure.
+ *
+ * Use: Creates the admin listening socket.
+ */
+
+extern int a_listen(const char */*sock*/,
+ uid_t /*u*/, gid_t /*g*/, mode_t /*m*/);
+
+/* --- @a_unlisten@ --- *
+ *
+ * Arguments: ---
+ *
+ * Returns: ---
+ *
+ * Use: Stops listening to the administration socket and removes it.
+ */
+
+extern void a_unlisten(void);
+
+/* --- @a_switcherr@ --- *
+ *
+ * Arguments: ---
+ *
+ * Returns: ---
+ *
+ * Use: Arrange to report warnings, trace messages, etc. to
+ * administration clients rather than the standard-error stream.
+ *
+ * Obviously this makes no sense unless there is at least one
+ * client established. Calling @a_listen@ won't help with this,
+ * because the earliest a new client can connect is during the
+ * first select-loop iteration, which is too late: some initial
+ * client must have been added manually using @a_create@.
+ */
+
+extern void a_switcherr(void);
+
+/* --- @a_signals@ --- *
+ *
+ * Arguments: ---
+ *
+ * Returns: ---
+ *
+ * Use: Establishes handlers for the obvious signals.
+ */
+
+extern void a_signals(void);
+