Date: Mon, 27 Feb 2023 21:51:25 +0100 From: Steffen Nurpmeso <steffen@sdaoden.eu> To: Ed Maste <emaste@freebsd.org> Cc: src-committers@freebsd.org, dev-commits-src-all@freebsd.org, dev-commits-src-main@freebsd.org Subject: Re: git: 2c709ee70ade - main - libc: handle zero alignment in memalign() Message-ID: <20230227205125.wT7DI%steffen@sdaoden.eu> In-Reply-To: <CAPyFy2AipV4Uvf9G9=DsKYmWBfhTxtyGKO4uQwWFXvwWQ2J5Tw@mail.gmail.com> References: <202302241821.31OIL4ux075893@gitrepo.freebsd.org> <20230224205001.Fbn1A%steffen@sdaoden.eu> <CAPyFy2D3T6AtK-TYU2HZ9R8QvemC%2B_2pZ52vqANoPOtHhnyuiw@mail.gmail.com> <20230225012736.PT3cH%steffen@sdaoden.eu> <CAPyFy2A-dnbrivwZiFoJv4sYL9qyXvoZX2SK-bcd9pEdf30qQg@mail.gmail.com> <20230225222952.t3oH3%steffen@sdaoden.eu> <CAPyFy2AipV4Uvf9G9=DsKYmWBfhTxtyGKO4uQwWFXvwWQ2J5Tw@mail.gmail.com>
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Ed Maste wrote in <CAPyFy2AipV4Uvf9G9=DsKYmWBfhTxtyGKO4uQwWFXvwWQ2J5Tw@mail.gmail.com>: |On Sat, 25 Feb 2023 at 17:29, Steffen Nurpmeso <steffen@sdaoden.eu> wrote: |> Ed Maste wrote in |> <CAPyFy2A-dnbrivwZiFoJv4sYL9qyXvoZX2SK-bcd9pEdf30qQg@mail.gmail.com>: |>|On Fri, 24 Feb 2023 at 20:27, Steffen Nurpmeso <steffen@sdaoden.eu> \ |>|wrote: |>|> Me too. 'Was just thinking of allocators which give back valid |>|> but inaccessible memory for 0 bytes so that each access would |>|> fault. |>| |>|The size is not (necessarily) zero though. The alignment requested is. |> |> I personally would fail EINVAL for 0: something really must be |> bogus if you reqest an alignment of 0. The standard says |> |> Upon successful completion, posix_memalign( ) shall return zero; | |This is not posix_memalign, this is memalign which is provided for |glibc compatibility (and which accepts align == 0). This came up only |because Valgrind's tests triggered this case. This is what happens when one mutilates the email quote context. --steffen | |Der Kragenbaer, The moon bear, |der holt sich munter he cheerfully and one by one |einen nach dem anderen runter wa.ks himself off |(By Robert Gernhardt)
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