[src/trunk]: src/share/man/man9 Use Dv NULL, per SIGWIZD.

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

details:   https://anonhg.NetBSD.org/src/rev/0f2c865e68d3
branches:  trunk
changeset: 337027:0f2c865e68d3
user:      riastradh <riastradh%NetBSD.org@localhost>
date:      Mon Mar 30 13:40:01 2015 +0000

description:
Use Dv NULL, per SIGWIZD.

diffstat:

 share/man/man9/bufferio.9 |  16 +++++++++++-----
 1 files changed, 11 insertions(+), 5 deletions(-)

diffs (44 lines):

diff -r 104874b96fd7 -r 0f2c865e68d3 share/man/man9/bufferio.9
--- a/share/man/man9/bufferio.9 Mon Mar 30 13:35:50 2015 +0000
+++ b/share/man/man9/bufferio.9 Mon Mar 30 13:40:01 2015 +0000
@@ -1,4 +1,4 @@
-.\"    $NetBSD: bufferio.9,v 1.11 2015/03/30 13:35:50 riastradh Exp $
+.\"    $NetBSD: bufferio.9,v 1.12 2015/03/30 13:40:01 riastradh Exp $
 .\"
 .\" Copyright (c) 2015 The NetBSD Foundation, Inc.
 .\" All rights reserved.
@@ -139,8 +139,10 @@
 .It
 If the user sets the
 .Fa bp Ns Li "->b_iodone"
-callback to a nonnull function pointer, it will be called in soft
-interrupt context when the I/O transfer is complete.
+callback to a
+.Pf non- Dv NULL
+function pointer, it will be called in soft interrupt context when the
+I/O transfer is complete.
 The user
 .Em may not
 call
@@ -159,7 +161,9 @@
 .It
 Otherwise, if
 .Fa bp Ns Li "->b_iodone"
-is a null function pointer and
+is
+.Dv NULL
+and
 .Dv B_ASYNC
 is not specified, the user may wait for the I/O transfer to complete
 with
@@ -360,7 +364,9 @@
 for an I/O transfer.
 If
 .Fa vp
-is nonnull, the transfer is associated with it.
+is
+.Pf non- Dv NULL ,
+the transfer is associated with it.
 If
 .Fa waitok
 is false,