#include <stdio.h>
#include <file.h>
#include "mydevice.h"
void main()
{
    add_device("mydevice", _MSA, 
               MYDEVICE_open, MYDEVICE_close, 
               MYDEVICE_read, MYDEVICE_write, 
               MYDEVICE_lseek, MYDEVICE_unlink, MYDEVICE_rename);
    /*-----------------------------------------------------------------------*/
    /* Re-open stderr as a MYDEVICE file                                     */
    /*-----------------------------------------------------------------------*/
    if (!freopen("mydevice:stderrfile", "w", stderr))
    { 
        puts("Failed to freopen stderr"); 
        exit(EXIT_FAILURE); 
    }
    /*-----------------------------------------------------------------------*/
    /* stderr should not be fully buffered; we want errors to be seen as     */
    /* soon as possible.  Normally stderr is line-buffered, but this example */
    /* does not buffer stderr at all.This means that there will be one call */
    /* to write() for each character in the message.                         */
    /*-----------------------------------------------------------------------*/
    if (setvbuf(stderr, NULL, _IONBF, 0))
    { 
        puts("Failed to setvbuf stderr"); 
        exit(EXIT_FAILURE); 
    }
    /*-----------------------------------------------------------------------*/
    /* Try it out!                                                           */
    /*-----------------------------------------------------------------------*/
    printf("This goes to stdout\n");
    fprintf(stderr, "This goes to stderr\n"); }