[src/trunk]: src/lib/libc/sys Document SIGBUS per ToG.

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

details:   https://anonhg.NetBSD.org/src/rev/a72db5887e7a
branches:  trunk
changeset: 336375:a72db5887e7a
user:      christos <christos%NetBSD.org@localhost>
date:      Fri Feb 27 16:18:00 2015 +0000

description:
Document SIGBUS per ToG.

diffstat:

 lib/libc/sys/mmap.2 |  12 ++++++++++--
 1 files changed, 10 insertions(+), 2 deletions(-)

diffs (33 lines):

diff -r b23e7c3c73b9 -r a72db5887e7a lib/libc/sys/mmap.2
--- a/lib/libc/sys/mmap.2       Fri Feb 27 16:09:19 2015 +0000
+++ b/lib/libc/sys/mmap.2       Fri Feb 27 16:18:00 2015 +0000
@@ -1,4 +1,4 @@
-.\"    $NetBSD: mmap.2,v 1.47 2012/01/05 15:19:52 reinoud Exp $
+.\"    $NetBSD: mmap.2,v 1.48 2015/02/27 16:18:00 christos Exp $
 .\"
 .\" Copyright (c) 1991, 1993
 .\"    The Regents of the University of California.  All rights reserved.
@@ -29,7 +29,7 @@
 .\"
 .\"    @(#)mmap.2      8.4 (Berkeley) 5/11/95
 .\"
-.Dd December 20, 2011
+.Dd February 27, 2015
 .Dt MMAP 2
 .Os
 .Sh NAME
@@ -138,6 +138,14 @@
 The mapped memory will be zero filled.
 .It Dv MAP_FILE
 Mapped from a regular file or character-special device memory.
+Read accesses beyond the end of of the file or device but less
+than the current page size will be zero-filled.
+Write accesses beyond the end of the file or device but less
+than the current page size will not affect the file or device.
+References beyond the end of file that are beyond the current
+page size will result in the delivery of
+.Dv SIGBUS
+signal.
 .It Dv MAP_FIXED
 Do not permit the system to select a different address than the one
 specified.