(ERR_MAILBOX_CORRUPTED): New error code.

(imap4d_set_observer): New function

@@ -134,6 +134,7 @@ struct imap4d_command
 #define ERR_TIMEOUT           3
 #define ERR_SIGNAL            4
 #define ERR_TLS               5
+#define ERR_MAILBOX_CORRUPTED 6
   
 /* Namespace numbers */
 #define NS_PRIVATE 0
@@ -216,6 +217,7 @@ extern void fetch_flags0 (const char *prefix, message_t msg, int isuid);
 extern int imap4d_sync __P ((void));
 extern int imap4d_sync_flags __P ((size_t));
 extern size_t uid_to_msgno __P ((size_t));
+extern void imap4d_set_observer (mailbox_t mbox);
   
 /* Signal handling.  */
 extern RETSIGTYPE imap4d_sigchld __P ((int));