D27160.diff
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	Index: head/lib/libc/sys/_umtx_op.2
	===================================================================
	--- head/lib/libc/sys/_umtx_op.2
	+++ head/lib/libc/sys/_umtx_op.2
	@@ -28,7 +28,7 @@
	.\"
	.\" $FreeBSD$
	.\"
	-.Dd November 13, 2017
	+.Dd November 16, 2020
	.Dt _UMTX_OP 2
	.Os
	.Sh NAME
	@@ -1101,6 +1101,15 @@
	.It Fa obj
	Pointer to the semaphore (of type
	.Vt struct _usem2 ) .
	+.It Fa uaddr
	+Size of the memory passed in via the
	+.Fa uaddr2
	+argument.
	+.It Fa uaddr2
	+Optional pointer to a structure of type
	+.Vt struct _umtx_time ,
	+which may be followed by a structure of type
	+.Vt struct timespec .
	.El
	.Pp
	Put the requesting thread onto a sleep queue if the semaphore counter
	@@ -1124,6 +1133,18 @@
	interruption and
	.Er EINTR
	error.
	+.Pp
	+If
	+.Dv UMTX_ABSTIME
	+was not set, and the operation was interrupted and the caller passed in a
	+.Fa uaddr2
	+large enough to hold a
	+.Vt struct timespec
	+following the initial
	+.Vt struct _umtx_time ,
	+then the
	+.Vt struct timespec
	+is updated to contain the unslept amount.
	.It Dv UMTX_OP_SEM2_WAKE
	Wake up waiters on semaphore lock.
	The arguments to the request are: