problem about color palettes

Hello all

I have a problem in programming with frame buffer
device as follows:


i use the following code in my program for setting the
color palettes:
    if ( 0> ioctl( fb, FBIOPUTCMAP, &p_cmap))
        perror( "" ) ;

but it does not work.
What is wrong ? and how can i set the palettes of
color ?

Thanks



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