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Message-ID: <2fetsqzfiztwbhkybwuvysvjt2oa64n6vkgjbgeuhti3eahwjh@wunpix75de4t>
Date: Wed, 25 Jun 2025 19:35:58 +0200
From: Alejandro Colomar <alx@...nel.org>
To: Eric Blake <eblake@...hat.com>
Cc: libc-alpha@...rceware.org, Florian Weimer <fweimer@...hat.com>,
bug-gnulib@....org, musl@...ts.openwall.com,
наб <nabijaczleweli@...ijaczleweli.xyz>, Douglas McIlroy <douglas.mcilroy@...tmouth.edu>,
Paul Eggert <eggert@...ucla.edu>, Robert Seacord <rcseacord@...il.com>,
Elliott Hughes <enh@...gle.com>, Bruno Haible <bruno@...sp.org>,
JeanHeyd Meneide <phdofthehouse@...il.com>, Rich Felker <dalias@...c.org>,
Adhemerval Zanella Netto <adhemerval.zanella@...aro.org>, Joseph Myers <josmyers@...hat.com>,
Laurent Bercot <ska-dietlibc@...rnet.org>, Andreas Schwab <schwab@...e.de>, Thorsten Glaser <tg@...bsd.de>,
Vincent Lefevre <vincent@...c17.net>, Mark Harris <mark.hsj@...il.com>,
Collin Funk <collin.funk1@...il.com>, Wilco Dijkstra <Wilco.Dijkstra@....com>,
DJ Delorie <dj@...hat.com>, Cristian Rodríguez <cristian@...riguez.im>,
Siddhesh Poyarekar <siddhesh@...plt.org>, Sam James <sam@...too.org>, Mark Wielaard <mark@...mp.org>,
"Maciej W. Rozycki" <macro@...hat.com>, Martin Uecker <ma.uecker@...il.com>,
Christopher Bazley <chris.bazley.wg14@...il.com>, eskil@...ession.se
Subject: Re: alx-0029r4 - Restore the traditional realloc(3) specification
Hi Eric,
On Wed, Jun 25, 2025 at 03:16:06PM +0200, Alejandro Colomar wrote:
> > > @@ New footnote XXX
> > > +XXX)
> > > +While atypical,
> > > +<b>realloc</b> may fail
> > > +for a call that shrinks the block of memory.
> >
> > Is it worth wording this as "may fail or return a different pointer
> > for a call that shrinks the block of memory"?
>
> Yeah, we can add that.
I've changed my mind; the current wording of ISO C makes it that all
realloc(3) successful return values are new pointers, and it doesn't
seem to mention that the old pointer could be kept (I remember having
seen such text in older standards, I think; or maybe in POSIX), so let's
keep in that sense, and assume that realloc(3) always moves the memory,
even if sometimes it doesn't, as that is not observable by a conforming
program.
Have a lovely day!
Alex
--
<https://www.alejandro-colomar.es/>
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