Thread: How do I do something when a program exits?

man atexit

I'm not sure about whether Ctrl-C results in "normal program termination." So something like this might also be of interest.

Code:

#include <stdio.h>
#include <signal.h>

volatile sig_atomic_t Done = 0;

void handler(int code)
{
   Done = 1;
}

int main(void)
{
   signal(SIGINT, handler);
   puts("Entering Loop");
   while ( !Done )
   {
      /* ... */
   }
   puts("Saving File");
   return 0;
}