> ## Documentation Index
> Fetch the complete documentation index at: https://dragonwingdocs.qualcomm.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Debug using Valgrind

The Valgrind tool helps detect memory-related errors that are common in C and C++ programs. These errors can lead to crashes and unpredictable behavior, such as memory leaks and memory corruption. By default, the build includes the Valgrind tool.

## **Prerequisite**

Set up SSH. For instructions, see [Sign in using SSH](https://docs.qualcomm.com/bundle/publicresource/topics/80-80021-254/how_to.html#use-ssh).

## **Debug with Valgrind**

1. Push debug symbols to the device. For instructions, see [Configure debug symbols](https://dragonwingdocs.qualcomm.com/System/Debug-Subsystem/configure-debug-symbols#configure-debug-symbols).
2. Run the following Valgrind command on the device:
   ```text theme={null}
   valgrind --tool=memcheck --leak-check=yes --show-reachable=yes --num-callers=20 --track-fds=yes /usr/bin/tqftpserv
   ```
   **Sample output:**
   ```text theme={null}
   ==622== Memcheck, a memory error detector
   ==622== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
   ==622== Command: /usr/bin/tqftpserv
   ==622==
   ^C==622==
   ==622== Process terminating with default action of signal 2 (SIGINT)
   ==622== at 0x498EF38: select (select.c:69)
   ==622== by 0x4013CB: ??? (in /usr/bin/tqftpserv)
   ==622== by 0x48DB1AF: (below main) (libc_start_call_main.h:58)
   ==622==
   ==622== FILE DESCRIPTORS: 4 open (3 std) at exit.
   ==622== Open pf-42 socket 3:
   ==622== at 0x49984CC: socket (syscall-template.S:120)
   ==622== by 0x4891293: qrtr_open (in /usr/lib/libqrtr.so.1.0)
   ==622== by 0x40129B: ??? (in /usr/bin/tqftpserv)
   ==622== by 0x48DB1AF: (below main) (libc_start_call_main.h:58)
   ==622==
   ==622==
   ==622== HEAP SUMMARY:
   ==622== in use at exit: 0 bytes in 0 blocks
   ==622== total heap usage: 0 allocs, 0 frees, 0 bytes allocated
   ==622==
   ==622== All heap blocks were freed -- no leaks are possible
   ==622==
   ==622== For lists of detected and suppressed errors, rerun with: -s
   ==622== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
   ==622== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
   ```

For more information, see [Valgrind](https://valgrind.org/).