head	1.1;
branch	1.1.1;
access;
symbols
	pkgsrc-2026Q1:1.1.1.1.0.178
	pkgsrc-2026Q1-base:1.1.1.1
	pkgsrc-2025Q4:1.1.1.1.0.176
	pkgsrc-2025Q4-base:1.1.1.1
	pkgsrc-2025Q3:1.1.1.1.0.174
	pkgsrc-2025Q3-base:1.1.1.1
	pkgsrc-2025Q2:1.1.1.1.0.172
	pkgsrc-2025Q2-base:1.1.1.1
	pkgsrc-2025Q1:1.1.1.1.0.170
	pkgsrc-2025Q1-base:1.1.1.1
	pkgsrc-2024Q4:1.1.1.1.0.168
	pkgsrc-2024Q4-base:1.1.1.1
	pkgsrc-2024Q3:1.1.1.1.0.166
	pkgsrc-2024Q3-base:1.1.1.1
	pkgsrc-2024Q2:1.1.1.1.0.164
	pkgsrc-2024Q2-base:1.1.1.1
	pkgsrc-2024Q1:1.1.1.1.0.162
	pkgsrc-2024Q1-base:1.1.1.1
	pkgsrc-2023Q4:1.1.1.1.0.160
	pkgsrc-2023Q4-base:1.1.1.1
	pkgsrc-2023Q3:1.1.1.1.0.158
	pkgsrc-2023Q3-base:1.1.1.1
	pkgsrc-2023Q2:1.1.1.1.0.156
	pkgsrc-2023Q2-base:1.1.1.1
	pkgsrc-2023Q1:1.1.1.1.0.154
	pkgsrc-2023Q1-base:1.1.1.1
	pkgsrc-2022Q4:1.1.1.1.0.152
	pkgsrc-2022Q4-base:1.1.1.1
	pkgsrc-2022Q3:1.1.1.1.0.150
	pkgsrc-2022Q3-base:1.1.1.1
	pkgsrc-2022Q2:1.1.1.1.0.148
	pkgsrc-2022Q2-base:1.1.1.1
	pkgsrc-2022Q1:1.1.1.1.0.146
	pkgsrc-2022Q1-base:1.1.1.1
	pkgsrc-2021Q4:1.1.1.1.0.144
	pkgsrc-2021Q4-base:1.1.1.1
	pkgsrc-2021Q3:1.1.1.1.0.142
	pkgsrc-2021Q3-base:1.1.1.1
	pkgsrc-2021Q2:1.1.1.1.0.140
	pkgsrc-2021Q2-base:1.1.1.1
	pkgsrc-2021Q1:1.1.1.1.0.138
	pkgsrc-2021Q1-base:1.1.1.1
	pkgsrc-2020Q4:1.1.1.1.0.136
	pkgsrc-2020Q4-base:1.1.1.1
	pkgsrc-2020Q3:1.1.1.1.0.134
	pkgsrc-2020Q3-base:1.1.1.1
	pkgsrc-2020Q2:1.1.1.1.0.130
	pkgsrc-2020Q2-base:1.1.1.1
	pkgsrc-2020Q1:1.1.1.1.0.110
	pkgsrc-2020Q1-base:1.1.1.1
	pkgsrc-2019Q4:1.1.1.1.0.132
	pkgsrc-2019Q4-base:1.1.1.1
	pkgsrc-2019Q3:1.1.1.1.0.128
	pkgsrc-2019Q3-base:1.1.1.1
	pkgsrc-2019Q2:1.1.1.1.0.126
	pkgsrc-2019Q2-base:1.1.1.1
	pkgsrc-2019Q1:1.1.1.1.0.124
	pkgsrc-2019Q1-base:1.1.1.1
	pkgsrc-2018Q4:1.1.1.1.0.122
	pkgsrc-2018Q4-base:1.1.1.1
	pkgsrc-2018Q3:1.1.1.1.0.120
	pkgsrc-2018Q3-base:1.1.1.1
	pkgsrc-2018Q2:1.1.1.1.0.118
	pkgsrc-2018Q2-base:1.1.1.1
	pkgsrc-2018Q1:1.1.1.1.0.116
	pkgsrc-2018Q1-base:1.1.1.1
	pkgsrc-2017Q4:1.1.1.1.0.114
	pkgsrc-2017Q4-base:1.1.1.1
	pkgsrc-2017Q3:1.1.1.1.0.112
	pkgsrc-2017Q3-base:1.1.1.1
	pkgsrc-2017Q2:1.1.1.1.0.108
	pkgsrc-2017Q2-base:1.1.1.1
	pkgsrc-2017Q1:1.1.1.1.0.106
	pkgsrc-2017Q1-base:1.1.1.1
	pkgsrc-2016Q4:1.1.1.1.0.104
	pkgsrc-2016Q4-base:1.1.1.1
	pkgsrc-2016Q3:1.1.1.1.0.102
	pkgsrc-2016Q3-base:1.1.1.1
	pkgsrc-2016Q2:1.1.1.1.0.100
	pkgsrc-2016Q2-base:1.1.1.1
	pkgsrc-2016Q1:1.1.1.1.0.98
	pkgsrc-2016Q1-base:1.1.1.1
	pkgsrc-2015Q4:1.1.1.1.0.96
	pkgsrc-2015Q4-base:1.1.1.1
	pkgsrc-2015Q3:1.1.1.1.0.94
	pkgsrc-2015Q3-base:1.1.1.1
	pkgsrc-2015Q2:1.1.1.1.0.92
	pkgsrc-2015Q2-base:1.1.1.1
	pkgsrc-2015Q1:1.1.1.1.0.90
	pkgsrc-2015Q1-base:1.1.1.1
	pkgsrc-2014Q4:1.1.1.1.0.88
	pkgsrc-2014Q4-base:1.1.1.1
	pkgsrc-2014Q3:1.1.1.1.0.86
	pkgsrc-2014Q3-base:1.1.1.1
	pkgsrc-2014Q2:1.1.1.1.0.84
	pkgsrc-2014Q2-base:1.1.1.1
	pkgsrc-2014Q1:1.1.1.1.0.82
	pkgsrc-2014Q1-base:1.1.1.1
	pkgsrc-2013Q4:1.1.1.1.0.80
	pkgsrc-2013Q4-base:1.1.1.1
	pkgsrc-2013Q3:1.1.1.1.0.78
	pkgsrc-2013Q3-base:1.1.1.1
	pkgsrc-2013Q2:1.1.1.1.0.76
	pkgsrc-2013Q2-base:1.1.1.1
	pkgsrc-2013Q1:1.1.1.1.0.74
	pkgsrc-2013Q1-base:1.1.1.1
	pkgsrc-2012Q4:1.1.1.1.0.72
	pkgsrc-2012Q4-base:1.1.1.1
	pkgsrc-2012Q3:1.1.1.1.0.70
	pkgsrc-2012Q3-base:1.1.1.1
	pkgsrc-2012Q2:1.1.1.1.0.68
	pkgsrc-2012Q2-base:1.1.1.1
	pkgsrc-2012Q1:1.1.1.1.0.66
	pkgsrc-2012Q1-base:1.1.1.1
	pkgsrc-2011Q4:1.1.1.1.0.64
	pkgsrc-2011Q4-base:1.1.1.1
	pkgsrc-2011Q3:1.1.1.1.0.62
	pkgsrc-2011Q3-base:1.1.1.1
	pkgsrc-2011Q2:1.1.1.1.0.60
	pkgsrc-2011Q2-base:1.1.1.1
	pkgsrc-2011Q1:1.1.1.1.0.58
	pkgsrc-2011Q1-base:1.1.1.1
	pkgsrc-2010Q4:1.1.1.1.0.56
	pkgsrc-2010Q4-base:1.1.1.1
	pkgsrc-2010Q3:1.1.1.1.0.54
	pkgsrc-2010Q3-base:1.1.1.1
	pkgsrc-2010Q2:1.1.1.1.0.52
	pkgsrc-2010Q2-base:1.1.1.1
	pkgsrc-2010Q1:1.1.1.1.0.50
	pkgsrc-2010Q1-base:1.1.1.1
	pkgsrc-2009Q4:1.1.1.1.0.48
	pkgsrc-2009Q4-base:1.1.1.1
	pkgsrc-2009Q3:1.1.1.1.0.46
	pkgsrc-2009Q3-base:1.1.1.1
	pkgsrc-2009Q2:1.1.1.1.0.44
	pkgsrc-2009Q2-base:1.1.1.1
	pkgsrc-2009Q1:1.1.1.1.0.42
	pkgsrc-2009Q1-base:1.1.1.1
	pkgsrc-2008Q4:1.1.1.1.0.40
	pkgsrc-2008Q4-base:1.1.1.1
	pkgsrc-2008Q3:1.1.1.1.0.38
	pkgsrc-2008Q3-base:1.1.1.1
	cube-native-xorg:1.1.1.1.0.36
	cube-native-xorg-base:1.1.1.1
	pkgsrc-2008Q2:1.1.1.1.0.34
	pkgsrc-2008Q2-base:1.1.1.1
	cwrapper:1.1.1.1.0.32
	pkgsrc-2008Q1:1.1.1.1.0.30
	pkgsrc-2008Q1-base:1.1.1.1
	pkgsrc-2007Q4:1.1.1.1.0.28
	pkgsrc-2007Q4-base:1.1.1.1
	pkgsrc-2007Q3:1.1.1.1.0.26
	pkgsrc-2007Q3-base:1.1.1.1
	pkgsrc-2007Q2:1.1.1.1.0.24
	pkgsrc-2007Q2-base:1.1.1.1
	pkgsrc-2007Q1:1.1.1.1.0.22
	pkgsrc-2007Q1-base:1.1.1.1
	pkgsrc-2006Q4:1.1.1.1.0.20
	pkgsrc-2006Q4-base:1.1.1.1
	pkgsrc-2006Q3:1.1.1.1.0.18
	pkgsrc-2006Q3-base:1.1.1.1
	pkgsrc-2006Q2:1.1.1.1.0.16
	pkgsrc-2006Q2-base:1.1.1.1
	pkgsrc-2006Q1:1.1.1.1.0.14
	pkgsrc-2006Q1-base:1.1.1.1
	pkgsrc-2005Q4:1.1.1.1.0.12
	pkgsrc-2005Q4-base:1.1.1.1
	pkgsrc-2005Q3:1.1.1.1.0.10
	pkgsrc-2005Q3-base:1.1.1.1
	pkgsrc-2005Q2:1.1.1.1.0.8
	pkgsrc-2005Q2-base:1.1.1.1
	pkgsrc-2005Q1:1.1.1.1.0.6
	pkgsrc-2005Q1-base:1.1.1.1
	pkgsrc-2004Q4:1.1.1.1.0.4
	pkgsrc-2004Q4-base:1.1.1.1
	pkgsrc-2004Q3:1.1.1.1.0.2
	pkgsrc-2004Q3-base:1.1.1.1
	pkgsrc-base:1.1.1.1
	TNF:1.1.1;
locks; strict;
comment	@# @;


1.1
date	2004.08.16.20.15.54;	author minskim;	state Exp;
branches
	1.1.1.1;
next	;

1.1.1.1
date	2004.08.16.20.15.54;	author minskim;	state Exp;
branches;
next	;


desc
@@



1.1
log
@Initial revision
@
text
@Wipe is a secure file wiping utility.

There are some low level issues that must be taken into consideration.
One of these is that there must be some sort of write barrier between
passes.  Wipe uses fdatasync(2) (or fsync(2)) as a write barrier, or
if fsync(2) isn't available, the file is opened with the O_DSYNC or
O_SYNC flag.  For wipe to be effective, each pass must be completely
written.  To ensure this, the drive must support some form of a write
barrier, write cache flush, or write cache disabling.  SCSI supports
ordered command tags, has a force media access bit for commands, and
write cache can be disable on mode page 8.  IDE/ATA drives support
write cache flushes and write cache disabling.

Unfortunately, not all drives actually disable write cache when asked
to.  Those drives are broken.  Write caching should always be
disabled, unless your system is battery backed and always powers down
cleanly.
@


1.1.1.1
log
@Import wipe from pkgsrc-wip.  Packaged by pancake and modified by me.

Wipe is a secure file wiping utility.

There are some low level issues that must be taken into consideration.
One of these is that there must be some sort of write barrier between
passes.  Wipe uses fdatasync(2) (or fsync(2)) as a write barrier, or
if fsync(2) isn't available, the file is opened with the O_DSYNC or
O_SYNC flag.  For wipe to be effective, each pass must be completely
written.  To ensure this, the drive must support some form of a write
barrier, write cache flush, or write cache disabling.  SCSI supports
ordered command tags, has a force media access bit for commands, and
write cache can be disable on mode page 8.  IDE/ATA drives support
write cache flushes and write cache disabling.

Unfortunately, not all drives actually disable write cache when asked
to.  Those drives are broken.  Write caching should always be
disabled, unless your system is battery backed and always powers down
cleanly.
@
text
@@