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Index: lib/libc/sys/_umtx_op.2
===================================================================
--- lib/libc/sys/_umtx_op.2
+++ lib/libc/sys/_umtx_op.2
@@ -28,7 +28,7 @@
.\"
.\" $FreeBSD$
.\"
-.Dd November 13, 2017
+.Dd November 12, 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 structure passed in 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 when 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:

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