From: Alejandro Colomar <alx@kernel.org>
To: 佐々木龍路 <tubuannohagi456@gmail.com>
Cc: linux-man@vger.kernel.org
Subject: Re: Possible typo/redundancy in mmap(2) SYNOPSIS
Date: Sun, 12 Apr 2026 16:19:24 +0200 [thread overview]
Message-ID: <adupQhfJQ7kws17U@debian> (raw)
In-Reply-To: <CAKcLgdirzdKqnaziRdYytN-zrVTjijtzOiirL5YJdWF8SSNf+Q@mail.gmail.com>
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Hi,
On 2026-04-12T23:11:47+0900, 佐々木龍路 wrote:
> 1. Where: mmap(2) SYNOPSIS section.
> 2. Issue: There is a semicolon after length and it appears twice,
> which looks like the function has an extra argument.
This is correct. That's a forward declaration of a function parameter.
They're documented here:
<https://gcc.gnu.org/onlinedocs/gcc/Variable-Length.html>
Have a lovely day!
Alex
> 3.Actual display: void *mmap(size_t length;void addr[length],size_t length,...);
> 4. Why it's confusing: From a syscall ABI perspective, rdi should be
> addr, not length. This notation might confuse users about the actual
> number of arguments.
> man 2.13.1
>
--
<https://www.alejandro-colomar.es>
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prev parent reply other threads:[~2026-04-12 14:19 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-12 14:11 Possible typo/redundancy in mmap(2) SYNOPSIS 佐々木龍路
2026-04-12 14:19 ` Alejandro Colomar [this message]
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