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Message-ID: <20260411194319.GX1827@brightrain.aerifal.cx>
Date: Sat, 11 Apr 2026 15:43:19 -0400
From: Rich Felker <dalias@...c.org>
To: Collin Funk <collin.funk1@...il.com>
Cc: musl@...ts.openwall.com, Gilles Peskine <gilles.peskine@....com>
Subject: Re: Detecting getrandom() or syscall()
On Sat, Apr 11, 2026 at 12:13:10PM -0700, Collin Funk wrote:
> Gilles Peskine <gilles.peskine@....com> writes:
>
> > I agree that something like
> > #if __has_function_syscall
> > is the way to go! So what macro can we use to test for the presence of
> > syscall() on musl or elsewhere?
>
> #include <fcntl.h>
> #if (defined __linux__ && defined O_SEARCH && defined O_PATH \
> && O_SEARCH == O_PATH)
> # define MUSL true
> #else
> # define MUSL false
> #endif
This is not valid and will likely break when we implement a more
correct version of O_SEARCH.
Please do not recommend wrong hacks like this.
Rich
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