[原]A simple example about call stack of C

/**
 * Only available on 32-bit i686 machine
 */

#include <iostream>
using namespace::std;
int injection(int i)
{
  cout << "injection" << " " << i << endl;
  return 0;
}
int main()
{
  int a;
  // Save the proper return address of main().
  unsigned int addr = *(&a + 2);
  // Set return address of main to be first instruction of injection().
  *(&a + 2) = (unsigned int)injection;
  // Set return address of injection() to be that of main() so that
  // main() will return properly.
  *(&a + 3) = addr;
  // Set the argument of injection().
  *(&a + 4) = 99;
  return 0;
}