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List:       linux-newbie
Subject:    Re: malloc and free
From:       Jagadeesh Bhaskar P <jbhaskar () hclinsys ! com>
Date:       2004-12-25 3:28:55
Message-ID: 1103944615.3799.7.camel () myLinux
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Hi,
	I have read that the malloc-ed memory is not actually freed upon
calling free, but is still maintained in the processes' malloc pool of
memory. So can that add to the memory leak attributing a segfault?
	Please someone tell if I am wrong!!

On Sat, 2004-12-25 at 00:23, Ray Olszewski wrote:
> At 06:39 PM 12/24/2004 +0000, Ankit Jain wrote:
> >hi
> >
> >routine xyz uses malloc and free functions. it gives
> >accurate and correct result if called once.
> >
> >but if the function is called in a loop N number of
> >times then probably it gives segmentation fault.
> >
> >what is the reason?  can any body guess or test code
> >is needed?
> 
> 
> Probably test code is needed. But if you want a guess ... the "free" call 
> contains an error that leads to a memory leak. If you call the routine 
> once, that's no big deal, and the routine will appear to return "accurate 
> and correct result". But if you call it a lot, memory consumption goes up 
> past the point where the kernel can support it and a segfault results.
> 
> That's just a shot in the dark, though ... and even it assumes that N is a 
> big number (thousands at least), not 10 or 20. Your use of "probably" does 
> make it an appealing guess, though.
> 
> Really, though, you are posing the question, "What can go wrong with 
> malloc() and free()?" Put that way, it is obvious that it is too vagure for 
> a troubleshooting list. Let's see the code, as well as whatever is calling 
> the code.
> 
> 
> 
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-- 
With regards,

Jagadeesh Bhaskar P

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