/*D
   MPI_T_cvar_read - Read the value of a control variable

Synopsis:
.vb
int MPI_T_cvar_read(MPI_T_cvar_handle handle, void *buf)
.ve

Input Parameters:
. handle - handle to the control variable to be read (handle)

Output Parameters:
. buf - initial address of storage location for variable value (choice)

.N ThreadSafe

.N Errors
.N MPI_SUCCESS
.N MPI_T_ERR_INVALID
.N MPI_T_ERR_INVALID_HANDLE
.N MPI_T_ERR_NOT_INITIALIZED
.N MPI_ERR_OTHER

D*/

