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Date:      Tue, 26 Mar 2019 19:39:07 -0700
From:      Enji Cooper <yaneurabeya@gmail.com>
To:        Alan Somers <asomers@FreeBSD.org>
Cc:        src-committers@freebsd.org, svn-src-projects@freebsd.org
Subject:   Re: svn commit: r345563 - projects/fuse2/tests/sys/fs/fusefs
Message-ID:  <43ACF554-1D64-4CDE-AB22-8A13E3585CC9@gmail.com>
In-Reply-To: <201903270024.x2R0Ov1e073868@repo.freebsd.org>
References:  <201903270024.x2R0Ov1e073868@repo.freebsd.org>

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> On Mar 26, 2019, at 5:24 PM, Alan Somers <asomers@FreeBSD.org> wrote:
>=20
> Author: asomers
> Date: Wed Mar 27 00:24:57 2019
> New Revision: 345563
> URL: https://svnweb.freebsd.org/changeset/base/345563
>=20
> Log:
>  fusefs: fix a race condition in the allow_other test
>=20
>  The test could occasionally hang if the parent's SIGUSR2 signal =
arrived
>  before the child had pause()d.  Using POSIX semaphores precludes that
>  possibility.
>=20
>  Sponsored by:	The FreeBSD Foundation

=E2=80=A6

> +	sem =3D (sem_t*)mmap(NULL, sizeof(*sem), mprot, mflags, -1, 0);
> +	ASSERT_NE(NULL, sem) << strerror(errno);

mmap will return =E2=80=9CMAP_FAILED=E2=80=9D, not NULL, on error.

Thanks,
-Enji=



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