Subject: Re: PROPOSAL: removal of brk()/sbrk().
To: <>
From: Simon Burge <>
List: tech-kern
Date: 02/26/2002 22:40:15
David Laight wrote:

> On Tue, Feb 26, 2002 at 11:29:43AM +1100, Darren Reed wrote:
> > 
> > Some things out there use sbrk() as the foundation of their own
> > application's malloc() and siply removing sbrk() from libc will
> > affect being able to compile them, never mind running them.
> ISTR one of the common shells worked this way.  Indeed it waited
> for the fault and had a signal handler that extended the data
> area.

The original Bourne shell does this.  I don't know if the reason was that
it pre-dated malloc(3) or was meant to be as lean as possible.

And lean it certainly is.  A static Bourne shell binary on a 1.5 alpha
is only a tad over 49kB - the only static binary in the distribution
smaller than that is /bin/sync.

[ Yes, people are probably sick of me mentioning this once a year or
  so, but the size of this program still amazes me, as does the fact
  that it works flawlessly on a 64bit system. ]

Simon Burge                            <>
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