void MOUNTPROC3_UMNTALL(void) = 4;
Procedure UMNTALL removes all of the mount entries for this client previously recorded by calls to MNT. AUTH_UNIX authentication or better is required.
This procedure should be used by clients when they are recovering after a system shutdown. If the client could not successfully unmount all of its file systems before being shutdown or the client crashed because of a software or hardware problem, there may be servers which still have mount entries for this client. This is an easy way for the client to inform all servers at once that it does not have any mounted file systems. However, since this procedure is generally implemented using broadcast RPC, it is only of limited usefullness.
There are no MOUNT protocol errors which can be returned from this procedure. However, RPC errors may be returned for authentication or other RPC failures.