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FreeBSD 11.0 - man page for explicit_bzero (freebsd section 3)

BZERO(3)						   BSD Library Functions Manual 						  BZERO(3)

NAME
bzero, explicit_bzero -- write zeroes to a byte string
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <strings.h> void bzero(void *b, size_t len); 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)
HISTORY
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.
BSD
October 6, 2014 BSD