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_bios_timeofday
===============

Syntax
------

     #include <bios.h>
     
     unsigned _bios_timeofday(unsigned cmd, unsigned long *timeval);

Description
-----------

The _bios_timeofday routine uses INT 0x1A to get or set the clock count
(which is the number of 18.2 Hz ticks since midnight). The CMD argument
can be either the _TIME_GETCLOCK or _TIME_SETCLOCK manifest constant.

Return Value
------------

If the argument is _TIME_GETCLOCK, the routine returns a nonzero value
if midnight was passed since last read, or zero if midnight was not
passed. If the argument is _TIME_SETCLOCK, the return value is
undefined.

Example
-------

     unsigned hour, min, sec, hsec;
     unsigned long ticks;
     ...
     ticks = (unsigned long)(hour * 65543.33) + (min * 1092.38) +
             (sec * 18.21) + (hsec * 0.182);
     _bios_timeofday(_TIME_SETCLOCK, &ticks);