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Message-ID: <offuvn2qlt5c5rc6kqjkz7godv6g7lz4mo2xooz34ptuzgr5jl@f56p43qrldze>
Date: Wed, 18 Jun 2025 20:05:34 +0200
From: Alejandro Colomar <alx@...nel.org>
To: Andreas Schwab <schwab@...e.de>
Cc: enh <enh@...gle.com>, Florian Weimer <fweimer@...hat.com>,
musl@...ts.openwall.com, Rich Felker <dalias@...c.org>,
Adhemerval Zanella Netto <adhemerval.zanella@...aro.org>, libc-alpha@...rceware.org, Joseph Myers <josmyers@...hat.com>,
наб <nabijaczleweli@...ijaczleweli.xyz>, Paul Eggert <eggert@...ucla.edu>,
Robert Seacord <rcseacord@...il.com>, Bruno Haible <bruno@...sp.org>, bug-gnulib@....org,
JeanHeyd Meneide <phdofthehouse@...il.com>
Subject: Re: BUG: realloc(p,0) should be consistent with malloc(0)
Hi Andreas,
On Wed, Jun 18, 2025 at 05:42:40PM +0200, Andreas Schwab wrote:
> On Jun 17 2025, Alejandro Colomar wrote:
>
> > RETURN VALUE
> >
> > If size is 0,
> > ...
> > either:
> >
> > - A null pointer shall be returned
> > and, if ptr is not a null pointer,
> > errno shall be set to EINVAL.
> >
> > - A pointer to the allocated space shall be returned,
> > and the memory object pointed to by ptr shall be freed.
> > ...
> >
>
> Note that all of this is marked obsolescent.
Note that it's marked obsolescent because ISO C has turned this into UB.
If ISO C defines the behavior again, then the obsolescence of this could
be reverted.
Have a lovely day!
Alex
--
<https://www.alejandro-colomar.es/>
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