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Synopsis:
    #include <bios.h>
    int _bios_timeofday( int service, long *timeval );

Description:
    The _bios_timeofday function uses INT 0x1A to get or set the current
    system clock value.  The values for service are:

    _TIME_GETCLOCK
        Places the current system clock value in the location pointed to by
        timeval.  The function returns zero if midnight has not passed since
        the last time the system clock was read or set; otherwise, it
        returns 1.

    _TIME_SETCLOCK
        Sets the system clock to the value in the location pointed to by
        timeval.


Returns:
    A value of -1 is returned if neither _TIME_GETCLOCK nor _TIME_SETCLOCK
    were specified; otherwise 0 is returned.

Example:
    #include <stdio.h>
    #include <bios.h>

    void main()
      {
        long time_of_day;

        _bios_timeofday( _TIME_GETCLOCK, &time_of_day );
        printf( "Ticks since midnight: %lu\n", time_of_day );
      }

    produces the following:

    Ticks since midnight: 762717

Classification:
    BIOS

Systems:
    DOS, Win, NT, DOS/PM