D6948.diff
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	Index: head/lib/libc/sys/pipe.2
	===================================================================
	--- head/lib/libc/sys/pipe.2
	+++ head/lib/libc/sys/pipe.2
	@@ -28,7 +28,7 @@
	.\" @(#)pipe.2 8.1 (Berkeley) 6/4/93
	.\" $FreeBSD$
	.\"
	-.Dd June 22, 2016
	+.Dd July 20, 2016
	.Dt PIPE 2
	.Os
	.Sh NAME
	@@ -109,6 +109,18 @@
	portable to older systems, so it is recommended to use the convention
	for using the endpoints in the traditional manner when using a
	pipe in one direction.
	+.Sh IMPLEMENTATION NOTES
	+The
	+.Fn pipe
	+function calls the
	+.Fn pipe2
	+system call.
	+As a result, system call traces such as those captured by
	+.Xr dtrace 1
	+or
	+.Xr ktrace 1
	+will show calls to
	+.Fn pipe2 .
	.Sh RETURN VALUES
	.Rv -std pipe
	.Sh ERRORS
	@@ -157,3 +169,10 @@
	.Fn pipe2
	function appeared in
	.Fx 10.0 .
	+.Pp
	+The
	+.Fn pipe
	+function became a wrapper around
	+.Fn pipe2
	+in
	+.Fx 11.0 .