[src/trunk]: src/share/man/man4 In the introduction, point out that RA_WB is ...

[gdt <gdt%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/2121fa3f82e4
branches:  trunk
changeset: 750238:2121fa3f82e4
user:      gdt <gdt%NetBSD.org@localhost>
date:      Mon Dec 21 19:04:36 2009 +0000

description:
In the introduction, point out that RA_WB is intended for recurring
fixed-sized transfers.  Clarification requested by pooka@.

diffstat:

 share/man/man4/ugen.4 |  4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diffs (18 lines):

diff -r d611d2bc7747 -r 2121fa3f82e4 share/man/man4/ugen.4
--- a/share/man/man4/ugen.4     Mon Dec 21 18:27:48 2009 +0000
+++ b/share/man/man4/ugen.4     Mon Dec 21 19:04:36 2009 +0000
@@ -1,4 +1,4 @@
-.\" $NetBSD: ugen.4,v 1.27 2009/04/10 15:07:08 joerg Exp $
+.\" $NetBSD: ugen.4,v 1.28 2009/12/21 19:04:36 gdt Exp $
 .\"
 .\" Copyright (c) 1999 The NetBSD Foundation, Inc.
 .\" All rights reserved.
@@ -118,6 +118,8 @@
 .Xr ioctl 2
 calls are available, and enable read-ahead and write-behind buffering
 respectively.
+This buffering supports fixed-sized USB transfers and is intended for
+devices with regular and continuing data transfers.
 When read-ahead or write-behind are enabled, the file descriptor
 may be set to use non-blocking IO.
 .Pp