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Date: Tue, 5 Aug 2014 17:04:39 -0400
From: Rich Felker <>
Subject: Re: How to setup pre-allocated heap stack space?

On Tue, Aug 05, 2014 at 01:59:21PM -0700, Weiming Zhao wrote:
> Hi Rich,
> I'm using it on a bare-metal setup. So the heap space some fixed address.
> So I think I should modify __brk() like:
> uintptr_t __brk(uintptr_t newbrk) {
>   return newbrk == 0 ? HEAP_BASE :  newbrk ; // assume heap is large enough
> }
> Is that correct?  I don't need to worry about free(), right?

Well I would at least make sure you don't overflow into other memory,
by checking against an upper bound for the heap. But yes, something
like the above looks right.


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