_bios_timeofday

raw OCR

Reads or sets the BIOS timer.

Defined in header <bios.h>

Syntax

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

Portability

DOS	UNIX	Windows	ANSI C	C++ only
■		■

Remarks

_bios_timeofday either reads or sets the BIOS timer. This is a timer counting ticks since midnight at a rate of roughly 18.2 ticks per second. _bios_timeofday uses BIOS interrupt OxlA.

The cmd parameter can be either of the following values:

_TIME_GETCLOCK	The functions stores the current BIOS timer value into the location pointed to by timep. If the timer has not been read or written since midnight, the function returns 1. Otherwise, the function returns 0.

TIME SETCLOCK	The function sets the BIOS timer to the long value pointed to by timep. The function does not return a value.

Return value

The _bios_timeofday returns the value in AX that was set by the BIOS timer call.

Example

#include <bios.h>
#include <time.h>
#include <conio.h>

int main(void)
{
   long bios_time;
   clrscr0 ;
   cprintfC'The number of  clock ticks since midnight is:\r\n"
   cprintfC'The number of  seconds since midnight is:\r\n
   cprintfC'The number of minutes  since midnight is:\r\n
   cprintfC'The number of hours  since midnight is:\r\n")
   cprintf("\r\nPress any  key to quit:");
   whiledkbhitO)    {
      _bios_timeofday(_TIME_GETCLOCK,  &bios_time);
      gotoxy(50, 1);
      cprintf("%lu" ,bios time) ;
      gotoxy(50, 2) ;
      cprintf("%.4f ' bios_time  / CLK_TCK);
      gotoxy(50, 3) ;
      cprintf("%.4f"  bios_time  / CLK_TCK / 60);
      gotoxy(50, 4);
      cprintf("%.4f"  bios_time  / CLK_TCK / 3600)

   return

Differences from modern implementations

Nothing recorded yet.

Modern references

Microsoft C runtime (search)

These are search links, not yet checked by hand.

Stable link: /3.1/bios.h/_bios_timeofday/ · short form /3.1/_bios_timeofday/