What non-Linux unixes support openat()?

openat() was added to POSIX in the POSIX.1-20开发者_运维知识库08 revision, and has been supported by Linux since 2.6.16. How is support on non-Linux UNIXes? eg, Darwin, the *BSDs, and proprietary UNIXes.

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Unlike the top answer is saying, all major BSDs and Apple's OS X seem to support it as of today:

• DragonFly since DragonFly 2.3.
• FreeBSD since FreeBSD 8.0.
• Linux since Linux 2.6.16 (for completeness).
• NetBSD since NetBSD 7.0.
• OpenBSD since OpenBSD 5.0.
• OS X since OS X 10.10.
• Solaris.

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Dragonfly BSD supports it, the rest of the BSDs don't. Solaris of course does.

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FreeBSD supports it since version 8.0