How do you run a function on exit in C++

Question

I have a function that I want to run whenever my program exits:

void foo() {
  std::cout<< \"Exiting\" << std::endl;
}

How do I reg

Answer 1

The only way (in Unix and Unix-like operating systems) to regain control after a process exits is to wait(2) for it. Short of a powerfail, kernel panic, or forced reboot, this should work:

#include 
#include 
#include 

int AtExit() {
    pid_t pid = fork();
    if(pid < 0) return pid;
    if(pid == 0) return pid;
    pid = waitpid(pid, 0, 0);
    return pid;
}

int main () {
  if(AtExit()) {
    std::cout << "Exiting\n";
    return 0;
  }

  std::cout << 7 << "\n";
}