// leaks.h

size_t leaks_count( void );

// leaks.c

static size_t leaks = 0;

void *__wrap_malloc( size_t s ) {
  ++leaks;
  return __real_malloc( s );
}

void *__wrap_calloc( size_t n, size_t s ) {
  ++leaks;
  return __real_calloc( n, s );
}

void __wrap_free( void *p ) {
  --leaks;
  __real_free( p );
}

size_t leaks_count( void ) {
  return leaks;
}

#include "leaks.h"

printf( "Reservas de memoria sin siberar: %zun", leaks_count( ) );