Syntax

#include <stdlib.h>
int atexit(void (*func)(void));

atexit records a function, pointed to by func, that the system calls at normal program termination. For portability, you should use atexit to register up to 32 functions only. The functions are executed in a LIFO (last-in-first-out) order.

atexit returns 0 if it is successful, and nonzero if it fails.

This example uses atexit to call the function goodbye at program termination.

#include <stdlib.h>
#include <stdio.h>

void goodbye(void)
{

   /* This function is called at normal program termination                   */

   printf("The function goodbye was called at program termination\n");
}

int main(void)
{
   int rc;

   rc = atexit(goodbye);
   if (rc != 0)
      perror("Error in atexit");
   return 0;

   /****************************************************************************
      The output should be:

      The function goodbye was called at program termination
   ****************************************************************************/
}

• exit
  
• exit
  
• onexit
  
• signal

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