Index: sys/sys/jail.h
===================================================================
diff -u -N -r47f8aaa5d9879f1433cc6a6509a4918d11df8979 -re31773d415117dd9e3c9178e8ac0360440fb5962
--- sys/sys/jail.h	(.../jail.h)	(revision 47f8aaa5d9879f1433cc6a6509a4918d11df8979)
+++ sys/sys/jail.h	(.../jail.h)	(revision e31773d415117dd9e3c9178e8ac0360440fb5962)
@@ -368,6 +368,7 @@
 void getcreddomainname(struct ucred *, char *, size_t);
 void getcredhostuuid(struct ucred *, char *, size_t);
 void getcredhostid(struct ucred *, unsigned long *);
+void getjailname(struct ucred *cred, char *name, size_t len);
 void prison0_init(void);
 int prison_allow(struct ucred *, unsigned);
 int prison_check(struct ucred *cred1, struct ucred *cred2);