1vga_oktowrite(3) Svgalib User Manual vga_oktowrite(3)
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6 vga_oktowrite - indicates whether the program has direct access to the
7 SVGA
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10 #include <vga.h>
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12 int vga_oktowrite(void);
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16 Indicates whether the program is in the console currently visible on
17 the screen, that is, whether it is OK to write to video memory (if run‐
18 ning in the background has been allowed with the function above). Note
19 that this is not entirely safe, since a console switch interrupt may
20 occur during a video operation. It is best to avoid this function.
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22 Usually your program will be suspended when it has no access to the
23 screen but see vga_runinbackground(3) for an alternative.
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27 svgalib(7), vgagl(7), libvga.config(5), bg_test(6), vga_runinback‐
28 ground(3), vga_runinbackground_version(3)
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32 This manual page was edited by Michael Weller <eowmob@exp-math.uni-
33 essen.de>. The exact source of the referenced function as well as of
34 the original documentation is unknown.
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36 It is very likely that both are at least to some extent are due to Harm
37 Hanemaayer <H.Hanemaayer@inter.nl.net>.
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39 Occasionally this might be wrong. I hereby asked to be excused by the
40 original author and will happily accept any additions or corrections to
41 this first version of the svgalib manual.
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45Svgalib (>= 1.2.11) 27 July 1997 vga_oktowrite(3)