mtrace

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

int
main(int argc, char *argv[])
{
    int j;

   mtrace();

   for (j = 0; j < 2; j++)
        malloc(100);            /* Never freed--a memory leak */

   calloc(16, 16);             /* Never freed--a memory leak */
    exit(EXIT_SUCCESS);
}

When we run the program as follows, we see that mtrace() diagnosed memory leaks at two different locations in the program:

$ cc -g t_mtrace.c -o t_mtrace
$ export MALLOC_TRACE=/tmp/t
$ ./t_mtrace
$ mtrace ./t_mtrace $MALLOC_TRACE
Memory not freed:
-----------------
   Address     Size     Caller
0x084c9378     0x64  at /home/cecilia/t_mtrace.c:12
0x084c93e0     0x64  at /home/cecilia/t_mtrace.c:12
0x084c9448    0x100  at /home/cecilia/t_mtrace.c:16