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-.\" Copyright (c) 1990, 1991 The Regents of the University of California.
-.\" All rights reserved.
-.\"
-.\" This code is derived from software contributed to Berkeley by
-.\" Chris Torek.
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\" 3. Neither the name of the University nor the names of its contributors
-.\"    may be used to endorse or promote products derived from this software
-.\"    without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.\"     $OpenBSD: bzero.3,v 1.13 2017/10/12 15:22:32 schwarze Exp $
-.\"
-.Dd $Mdocdate: October 12 2017 $
-.Dt BZERO 3
-.Os
-.Sh NAME
-.Nm bzero ,
-.Nm explicit_bzero
-.Nd write zeroes to a byte string
-.Sh SYNOPSIS
-.In strings.h
-.Ft void
-.Fn bzero "void *b" "size_t len"
-.In string.h
-.Ft void
-.Fn explicit_bzero "void *b" "size_t len"
-.Sh DESCRIPTION
-The
-.Fn bzero
-function writes
-.Fa len
-zero bytes to the string
-.Fa b .
-If
-.Fa len
-is zero,
-.Fn bzero
-does nothing.
-.Pp
-The
-.Fn explicit_bzero
-variant behaves the same, but will not be removed by a compiler's dead store
-optimization pass, making it useful for clearing sensitive memory such as a
-password.
-.Sh SEE ALSO
-.Xr memset 3 ,
-.Xr swab 3
-.Sh STANDARDS
-The
-.Fn bzero
-function conforms to the X/Open System Interfaces option of the
-.St -p1003.1-2004
-specification.
-It was removed from the standard in
-.St -p1003.1-2008 ,
-which recommends using
-.Xr memset 3
-instead.
-.Pp
-The
-.Fn explicit_bzero
-function is an
-.Ox
-extension.
-.Sh HISTORY
-The
-.Fn bzero
-function first appeared in
-.Bx 4.2 .
-The
-.Fn explicit_bzero
-function first appeared in
-.Ox 5.5 .