/**
 * gcc -o dgatest dgatest.c -L/usr/X11R6/lib -lX11 -lXext -lXxf86dga
 */

#include <stdio.h>
#include <X11/Xlib.h>

int main( int argc, char **argv )
{
    Display *d = XOpenDisplay(0);
    int s = DefaultScreen(d);
    int bar, fred, bpl;
    void *base;

    XF86DGAGetVideoLL( d, s, (void*)&base, &bpl, &bar, &fred );
    fprintf( stderr, "base 0x%x\n", base );
    return 0;
}