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

void __cxa_finalize(void *d) {
        // Create environmental variable to track calls to __cxa_finalize().
        // Note that getenv() is called here. The "__cxa_finalize_called" string
        //  has not yet been set as an environmental variable, so getenv() will
	//  return NULL here.
        const char* cxa_called_str = getenv("__cxa_finalize_called");

        // track number of times __cxa_finalize() is called
        int cxa_called = 0;

        // string buffer
        char buf[100];

        printf("__cxa_finalize() called ");
        if (!cxa_called_str) {                                  // on 1st call to __cxa_finalize(), cxa_called_str is NULL
                setenv("__cxa_finalize_called", "1", 1);        // create environmental variable key : value pair
                printf("1 time!\n");
                printf("I <3 LD_PRELOAD\n");
        }
        else {
                cxa_called = atoi(cxa_called_str);
                cxa_called += 1;                                // increment library function call counter
                printf("%d times!\n", cxa_called);
                sprintf(buf, "%d", cxa_called);                 // convert integer to string
                setenv("__cxa_finalize_called", buf, 1);        // update environmental variable value with new count
        }
        return;
}