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my first take at a memory leak detection document

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Daniel Stenberg 2002-10-13 10:34:33 +00:00
parent 94bae20776
commit fc4d1d9a60
2 changed files with 50 additions and 1 deletions
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lib/Makefile.am
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@ -7,7 +7,7 @@ AUTOMAKE_OPTIONS = foreign nostdinc
EXTRA_DIST = getdate.y Makefile.b32 Makefile.b32.resp Makefile.m32 \
Makefile.vc6 Makefile.riscos libcurl.def dllinit.c curllib.dsp \
curllib.dsw config-vms.h config-win32.h config-riscos.h config-mac.h \
config.h.in ca-bundle.crt README.encoding
config.h.in ca-bundle.crt README.encoding README.memoryleak
lib_LTLIBRARIES = libcurl.la

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lib/README.memoryleak Normal file
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$Id$
_ _ ____ _
___| | | | _ \| |
/ __| | | | |_) | |
| (__| |_| | _ <| |___
\___|\___/|_| \_\_____|
How To Track Down Suspected Memory Leaks in libcurl
===================================================
Build
Rebuild libcurl with -DMALLOCDEBUG (usually, rerunning configure with
--enable-debug fixes this). 'make clean' first, then 'make' so that all
files actually are rebuilt properly. It will also make sense to build
libcurl with the debug option (usually -g to the compiler) so that debugging
it will be easier if you actually do find a leak in the library.
This will create a library that has memory debugging enabled.
Modify Your Application
Add a line in your application code:
curl_memdebug("filename");
This will make the malloc debug system output a full trace of all resource
using functions to the given file name. Make sure you rebuild your program
and that you link with the same libcurl you built for this purpose as
described above.
Run Your Application
Run your program as usual. Watch the specified memory trace file grow.
Make your program exit and use the proper libcurl cleanup functions etc. So
that all non-leaks are returned/freed properly.
Analyze the Flow
Use the tests/memanalyze.pl perl script to analyze the memdump file:
tests/memanalyze.pl < memdump
This now outputs a report on what resources that were allocated but never
freed etc. This report is very fine for posting to the list!
If this doesn't produce any output, no leak was detected in libcurl. Then
the leak is mostly likely to be in your code.