• 5.13.1. DX_UIO Overview
• 5.13.2. DX_UIO Definition
• 5.13.3. DX_UIO Parameters

5.13. DX_UIO: User-Defined Input/Output

The DX_UIO data structure contains parameters for User-Defined Input/Output.

5.13.1. DX_UIO Overview

This structure, returned by dx_setuio( ), contains pointers to user-defined I/O functions for accessing nonstandard storage devices.

5.13.2. DX_UIO Definition

The typedef for the structure is as follows:

       /*

        * Structure for user-defined I/O functions

        */

       typedef struct DX_UIO {

          int  (*u_read) ( );

          int  (*u_write) ( );

          int  (*u_seek) ( );

       } DX_UIO;




5.13.3. DX_UIO Parameters

Parameter	Description
u_read	Points to the user-defined read( ) function, which returns an integer equal to the number of bytes read or -1 for error.
u_write	Points to the user-defined write( ) function, which returns an integer equal to the number of bytes written or -1 for error.
u_seek	Points to the user-defined lseek( ) function, which returns a long equal to the offset into the I/O device where the read or write is to start or -1 for error.

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