Technical Stuff

main()
{
char *ptr = (char *)malloc(10 * sizeof(char));
//free(ptr); // memory leak , uncomment for no memory leak
}

Valgrind result for the above code:

Unix:~/practice 1801> valgrind a.out

==29043== Memcheck, a memory error detector
==29043== Copyright (C) 2002-2009, and GNU GPL'd, by Julian Seward et al.
==29043== Using Valgrind-3.5.0 and LibVEX; rerun with -h for copyright info
==29043== Command: a.out
==29043==
==29043==
==29043== HEAP SUMMARY:
==29043== in use at exit: 10 bytes in 1 blocks
==29043== total heap usage: 1 allocs, 0 frees, 10 bytes allocated
==29043==
==29043== LEAK SUMMARY:
==29043== definitely lost: 10 bytes in 1 blocks
==29043== indirectly lost: 0 bytes in 0 blocks
==29043== possibly lost: 0 bytes in 0 blocks
==29043== still reachable: 0 bytes in 0 blocks
==29043== suppressed: 0 bytes in 0 blocks
==29043== Rerun with --leak-check=full to see details of leaked memory
==29043==
==29043== For counts of detected and suppressed errors, rerun with: -v
==29043== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 4 from 4)
Unix:~/practice 1802>


In the above result, red colored data clearly showing the leakage details. LEAK SUMMARY will be displayed only if any leak occurs in the application/program. And it will give the details about all lost data, In our example it is 10 bytes lost as we are not free'd the allocated data.