NAME

       vga_oktowrite - indicates whether the program has direct access to the SVGA

SYNOPSIS

       #include <vga.h>

       int vga_oktowrite(void);

DESCRIPTION

       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 see vga_runinbackground(3)
       for an alternative.

SEE ALSO

       svgalib(7),         vgagl(7),         libvga.config(5),        bg_test(6),        vga_runinbackground(3),
       vga_runinbackground_version(3)

AUTHOR

       This manual page was edited by Michael Weller <eowmob@exp-math.uni-essen.de>. 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  Hanemaayer
       <H.Hanemaayer@inter.nl.net>.

       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.

Svgalib (>= 1.2.11)                               27 July 1997                                  vga_oktowrite(3)