Communications Programming Concepts

XDR Subroutine Format

An eXternal Data Representation (XDR) subroutine is associated with each data type. XDR subroutines have the following format:

xdr_XXX (XDRS, FP)
       XDR *XDRS;
       XXX *FP;
{
}

The parameters are described as follows:

`XXX`	Requires an XDR data type.
`XDRS`	Specifies an opaque handle that points to an XDR stream. The opaque handle pointer is passed to the primitive XDR routines.
`FP`	Specifies an address of the data value that provides data to the stream or receives data from it.

The XDR subroutines usually return a value of 1 if successful. If unsuccessful, the return value is 0. Return values other than these are noted within the description of the appropriate subroutine.