svn commit: r303104 - head/lib/libc/sys

[Brooks Davis]

Author: brooks
Date: Wed Jul 20 18:02:07 2016
New Revision: 303104
URL: https://svnweb.freebsd.org/changeset/base/303104

Log:
  Update to reflect the fact that pipe() is a wrapper around the pipe2()
  system call.
  
  Reviewed by:	jhb, wblock
  MFC after:	5 days
  Sponsored by:	DAPRA, AFRL
  Differential Revision:	https://reviews.freebsd.org/D6948

Modified:
  head/lib/libc/sys/pipe.2

Modified: head/lib/libc/sys/pipe.2
==============================================================================
--- head/lib/libc/sys/pipe.2	Wed Jul 20 18:00:22 2016	(r303103)
+++ head/lib/libc/sys/pipe.2	Wed Jul 20 18:02:07 2016	(r303104)
@@ -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 @@ 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 .