vga_oktowrite - indicates whether the program has direct access to the SVGA
Indicates whether the program is in the console currently visible on the screen,
that is, whether it is OK to write to video memory (if running in the
background has been allowed with the function above). Note that this is not
entirely safe, since a console switch interrupt may occur during a video
operation. It is best to avoid this function.
Usually your program will be suspended when it has no access to the screen but
(3) for an alternative.
This manual page was edited by Michael Weller
<email@example.com>. The exact source of the referenced
function as well as of the original documentation is unknown.
It is very likely that both are at least to some extent are due to Harm
Occasionally this might be wrong. I hereby asked to be excused by the original
author and will happily accept any additions or corrections to this first
version of the svgalib manual.