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845天前
鸽子
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849天前#include <stdio.h> |
#include <dos.h> |
#include <conio.h> |
#define INTR 0X1C /* The clock tick |
interrupt */ |
void interrupt ( *oldhandler ) ( void ); |
int count=0; |
void interrupt handler ( void ) |
{ |
/* disable interrupts during the handling of |
the interrupt */ |
disable(); |
/* increase the global counter */ |
count++; |
/* reenable interrupts at the end of the |
handler */ |
enable(); |
/* call the old routine */ |
oldhandler(); |
} |
int main ( void ) |
{ |
/* save the old interrupt vector */ |
oldhandler = getvect ( INTR ); |
/* install the new interrupt handler */ |
setvect ( INTR, handler ); |
/* loop until the counter exceeds 20 */ |
while ( count < 20 ) |
printf ( "count is %d\n",count ); |
/* reset the old interrupt handler */ |
setvect ( INTR, oldhandler ); |
return 0; |
} |
