Terminates access to a vgroup and/or vdata interface.
Return value
Returns SUCCEED (or 0) if successful and FAIL (or -1) otherwise.
Description
Vend terminates access to the vgroup and/or vdata interfaces initiated by Vstart and all internal data structures allocated by Vstart.
Vend must be called after all vdata and vgroup operations on the file file_id are completed. Further attempts to use vdata or vgroup routines after calling Vend will result in a FAIL (or -1) being returned.