Calls BIOS time and date services, using INT 0x1A.
#include <bios.h>
unsigned _bios_timeofday( unsigned service, long *timeval );
| service | Time function desired | |
| timeval | Clock count |
The _bios_timeofday routine uses INT 0x1A to get or set the clock count. The service argument can be either of the following manifest constants:
| Constant | Meaning |
| _TIME_GETCLOCK | Copies the current value of the clock count to the location pointed to by timeval. If midnight has not passed since the last time the system clock was read or set, the function returns 0; otherwise, the function returns 1. |
| _TIME_SETCLOCK | Sets the current value of the system clock to the value in the location pointed to by timeval. There is no return value. |
The _bios_timeofday function returns the value in the AX register after the BIOS interrupt.
Standards:None
16-Bit:DOS, QWIN, WIN, WIN DLL
32-Bit:None
/* BTIMEOFD.C: This program gets the current system clock count before and after
* a "do-nothing" loop and displays the difference.
*/
#include <bios.h>
#include <stdio.h>
void main( void )
{
long i, begin_tick, end_tick;
_bios_timeofday( _TIME_GETCLOCK, &begin_tick );
printf( "Beginning tick count: %lu\n", begin_tick );
for( i = 1; i <= 900000; i++ )
;
_bios_timeofday( _TIME_GETCLOCK, &end_tick );
printf( "Ending tick count: %lu\n", end_tick );
printf( "Elapsed ticks: %lu\n", end_tick - begin_tick );
}
Beginning tick count: 1114255
Ending tick count: 1114287
Elapsed ticks: 32