| bzero, explicit_bzero(3) | write zeroes to a byte string |
| explicit_bzero, bzero(3) | write zeroes to a byte string |
| bstring, bcmp, bcopy, bzero, memccpy, memchr, memcmp, memcpy, memmove, memset(3) | byte string operations |
| BZERO(3) | MidnightBSD Library Functions Manual | BZERO(3) |
bzero,
explicit_bzero — write
zeroes to a byte string
Standard C Library (libc, -lc)
#include
<strings.h>
void
bzero(void
*b, size_t
len);
void
explicit_bzero(void
*b, size_t
len);
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.
A bzero() function appeared in
4.3BSD. Its prototype existed previously in
<string.h> before it was
moved to <strings.h> for
IEEE Std 1003.1-2001 (“POSIX.1”)
compliance.
The explicit_bzero() function first
appeared in OpenBSD 5.5 and FreeBSD
11.0.
IEEE Std 1003.1-2008
(“POSIX.1”) removes the specification of
bzero() and it is marked as LEGACY in
IEEE Std 1003.1-2004 (“POSIX.1”). For
portability with other systems new programs should use
memset(3).
| August 24, 2015 | midnightbsd-3.1 |