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kib
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2019-07-06T20:31:37.509527Z
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Document atomicity for read(2) and write(2).

Take part of the text from POSIX 2018 edition and describe the
atomicity requirements for read and write syscalls.  See p1003.1-2018,
Vol.2, 2.9.7 Threads interaction with Regular File Operations.

Reviewed by:	asomers
Sponsored by:	The FreeBSD Foundation
MFC after:	3 days
Differential revision:	https://reviews.freebsd.org/D20867

END