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Instruments, how to fix leak in C Lib
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Instruments, how to fix leak in C Lib


  • Subject: Instruments, how to fix leak in C Lib
  • From: Alexander Reichstadt <email@hidden>
  • Date: Wed, 02 May 2012 09:59:40 +0200

Hi,

through Instruments I found a memory leak outside my code in a pqlib, the postgres client library.

This is what Leaks prints out:

Bytes Used	# Leaks		Symbol Name
  84.81 KB     100.0%	48	 	PQgetResult
  84.81 KB     100.0%	48	 	 pqParseInput3
  80.00 KB      94.3%	40	 	  pqResultAlloc
  80.00 KB      94.3%	40	 	   malloc
   4.00 KB       4.7%	4	 	  pqAddTuple
   4.00 KB       4.7%	4	 	   malloc
    832 Bytes    0.9%	4	 	  PQmakeEmptyPGresult
    832 Bytes    0.9%	4	 	   malloc


I thought that inside PQgetResult there ought to be a call to pqParseInput3, inside of which I would then e.g. find a call to pqResultAlloc. But this is not the case. So I thought maybe the compiled version of the C-library I am using here does not match the sourcecode I obtained. I recompiled the library from source, built the Objective-C framework and rebuilt my app and did a new trace, but the leaks' trees were identical also now that I excluded the source for error of there being a difference in version.

Please can someone help how to read this?

Cheers
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