[Bug 214633] Open symlink with O_NOFOLLOW should fail with ELOOP, not EMLINK

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Sat Nov 19 21:42:00 UTC 2016


https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214633

Jilles Tjoelker <jilles at FreeBSD.org> changed:

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                 CC|                            |jilles at FreeBSD.org

--- Comment #1 from Jilles Tjoelker <jilles at FreeBSD.org> ---
This question has come up before in
https://lists.freebsd.org/pipermail/freebsd-fs/2011-March/010952.html. The
error for O_NOFOLLOW is [EMLINK] because that allows distinguishing a symlink
loop in the non-final components of the path from a symlink in the final
component of the path. The implementation of cmp(1) (-h option) depends on this
and contrib/xz takes advantage of it to avoid a race condition.

Perhaps an Austin group bug should be opened about this.

By the way, NetBSD returns [EFTYPE] in this case.

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