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From: Brooks Davis <brooks@FreeBSD.org>
Date: Wed, 3 Aug 2016 16:10:53 +0000 (UTC)
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Subject: svn commit: r303717 - stable/11/lib/libc/sys
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Author: brooks
Date: Wed Aug  3 16:10:53 2016
New Revision: 303717
URL: https://svnweb.freebsd.org/changeset/base/303717

Log:
  MFC r303104, r303106:
  
  Update to reflect the fact that pipe() is a wrapper around the pipe2()
  system call.
  
  Reviewed by:	jhb, wblock
  Sponsored by:	DAPRA, AFRL
  
  Change wording to use function rather than system call in the
  description
  as well.
  
  Authored by:	zeising
  Reviewed by:	brooks
  
  Approved by:	re (gjb)
  Sponsored by:	DAPRA, AFRL

Modified:
  stable/11/lib/libc/sys/pipe.2
Directory Properties:
  stable/11/   (props changed)

Modified: stable/11/lib/libc/sys/pipe.2
==============================================================================
--- stable/11/lib/libc/sys/pipe.2	Wed Aug  3 16:08:21 2016	(r303716)
+++ stable/11/lib/libc/sys/pipe.2	Wed Aug  3 16:10:53 2016	(r303717)
@@ -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
@@ -46,7 +46,7 @@
 .Sh DESCRIPTION
 The
 .Fn pipe
-system call
+function
 creates a
 .Em pipe ,
 which is an object allowing
@@ -109,6 +109,18 @@ The bidirectional nature of this impleme
 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 @@ The
 .Fn pipe2
 function appeared in
 .Fx 10.0 .
+.Pp
+The
+.Fn pipe
+function became a wrapper around
+.Fn pipe2
+in
+.Fx 11.0 .