getvect()

功 能: 取得中断向量入口

用 法: void interrupt(*getvect(int intr_num));

程序例:

#include <stdio.h>

#include <dos.h>

void interrupt get_out(); /* interrupt prototype */

void interrupt (*oldfunc)(); /* interrupt function pointer */

int looping = 1;

int main(void)

{

puts("Press <Shift><Prt Sc> to terminate");

/* save the old interrupt */

oldfunc = getvect(5);

/* install interrupt handler */

setvect(5,get_out);

/* do nothing */

while (looping);

/* restore to original interrupt routine */

setvect(5,oldfunc);

puts("Success");

return 0;

}

void interrupt get_out()

{

looping = 0; /* change global variable to get out of loop */

}