Modify the value of a variable while the program is running under Linux

1 #include <stdio.h>

2 #include <stdlib.h>

3

4 void Bug ()

5 {

6 System ("reboot");

7 exit (0);

8}

9 int stack_test (int a,int b)

10 {

//int *p=&a;

//p--;

//*p=bug;

printf ("Before write:0x%x\n", b);

*p=&a; int

p++;

*P=0XDDDD;

printf ("After write:0x%x\n", b);

C=0XCCCC int;

return C;

21}

int main ()

23 {

A=0XAAAA int;

B=0XBBBB int;

Ret=stack_test Int (A, b);

printf ("You should run here\n");

return 0;

29}

The result of the program operation is:

Before WRITE:0XBBBB

After WRITE:0XDDDD

Should run here

The bug function restarts the system;

The reason for the change in the value of B: function parameters in the stack when the right-to-left, so B on the next A on, the pointer p to a, p at + + point to the B, so change the value of the pointer p will change the value of B

This article is from the "fringe" blog, so be sure to keep this source http://ab6107.blog.51cto.com/10538332/1761446

Modify the value of a variable while the program is running under Linux