setvect

函数名:setvect

功 能:设置中断矢量入口

用 法:void setvect(int intr_num, void interrupt(*isr)());

程序例:

/***NOTE: This is an interrupt service routine. You can NOT compile this program with Test Stack Overflow turned on and get an executable file which will operate correctly. */

#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)

{

/* increase the global counter */

count++;

/* 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

",count);

/* reset the old interrupt handler */

setvect(INTR, oldhandler);

return 0;

}