#include <stdio.h>
#include <stdlib.h>
#define __USE_GNU
#include <dlfcn.h>

extern void *__libc_free(void *ptr);

static void *(*real_malloc) (size_t);
int cnt_blocks = 0;

void *malloc (size_t size)
{
    if (cnt_blocks >= 77) {
        fprintf (stderr, "number of allocated blocks is more then 77\n");
        return (NULL);
    }
    cnt_blocks++;
    return (*real_malloc) (size);
}

void free(void *ptr)
{
    printf("%d\n", ptr);
    __libc_free(ptr);
    cnt_blocks--;
    printf("Nubmer of allocated blocks: %d\n", cnt_blocks);
    printf("%d\n", ptr);
}

static void __malloc_init (void) __attribute__((constructor));
static void __malloc_init (void)
{
    void *ptr;
    ptr = dlopen (NULL, RTLD_LAZY);
    if (ptr == NULL)
        abort ();
    real_malloc = dlsym (RTLD_NEXT, "malloc");
    if (NULL == real_malloc) {
        fprintf (stderr, "Error in `dlsym`: %s\n", dlerror ());
        return;
    }
}