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Command: bzero | Section: 3 | Source: OpenBSD | File: bzero.3
BZERO(3) FreeBSD Library Functions Manual BZERO(3)
NAME
bzero, explicit_bzero - write zeroes to a byte string
SYNOPSIS
#include <strings.h>
void
bzero(void *b, size_t len);
#include <string.h>
void
explicit_bzero(void *b, size_t len);
DESCRIPTION
The bzero() function writes len zero bytes to the string b. If len is
zero, bzero() does nothing.
The 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.
SEE ALSO
memset(3), swab(3)
STANDARDS
The bzero() function conforms to the X/Open System Interfaces option of
the IEEE Std 1003.1-2004 ("POSIX.1") specification. It was removed from
the standard in IEEE Std 1003.1-2008 ("POSIX.1"), which recommends using
memset(3) instead.
The explicit_bzero() function is an OpenBSD extension.
HISTORY
The bzero() function first appeared in 4.2BSD. The explicit_bzero()
function first appeared in OpenBSD 5.5.
FreeBSD 14.1-RELEASE-p8 October 12, 2017 FreeBSD 14.1-RELEASE-p8