An XDR routine is associated with each data type. XDR routines have the following format:

xdr_xxx(xdrs,dp)
          XDR *xdrs;
          xxx *dp;
{
}

The routine has the following parameters:

xxx

XDR data type.

Opaque handle that points to an XDR stream. The system passes the opaque handle pointer to the primitive XDR routines.

Address of the data value that is to be encoded or decoded.

If they succeed, the XDR routines return a value of 1; if they do not succeed, they return a value of 0.