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Re: PATCH: and query for malloc(0).
- X-seq: zsh-workers 23361
- From: Peter Stephenson <pws@xxxxxxx>
- To: Zsh Hackers <zsh-workers@xxxxxxxxxx>
- Subject: Re: PATCH: and query for malloc(0).
- Date: Mon, 30 Apr 2007 10:22:41 +0100
- In-reply-to: <20070430032948.GA2612@xxxxxxxxxxxxxxx>
- Mailing-list: contact zsh-workers-help@xxxxxxxxxx; run by ezmlm
- References: <200704272135.l3RLZE1d005051@xxxxxxxxxxxxxxxxx> <20070430032948.GA2612@xxxxxxxxxxxxxxx>
Geoff Wing wrote:
> On Saturday 2007-04-28 07:36 +1000, Peter Stephenson output:
> :Playing with POSIX regexes, I found some errors coming from zsh's memory
> :allocation with debugging on. These turned out to resolve to some
> :malloc()s and free()s for zero length and the following oddity in
> :malloc():
> : /* some systems want malloc to return the highest valid address plus one
> : if it is called with an argument of zero */
> : if (!size)
> : return (MALLOC_RET_T) m_high;
>...
> Given the above, I guess the patch is a reasonable fix.
Thanks, I think I'll commit it and see what happens; under most
circumstances that will be very little.
> We are not actually calling malloc(0) in-house, are we?
No, that should be trapped up above in zalloc(), etc. I've only seen
the problem when linked with a C library function that's calling
malloc(0).
--
Peter Stephenson <pws@xxxxxxx> Software Engineer
CSR PLC, Churchill House, Cambridge Business Park, Cowley Road
Cambridge, CB4 0WZ, UK Tel: +44 (0)1223 692070
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