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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 .