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EXPLICIT_BZERO(3bsd) 3bsd EXPLICIT_BZERO(3bsd)

NAME

explicit_bzero —
write zeroes to a byte string

LIBRARY

library “libbsd”

SYNOPSIS

#include <string.h> (See libbsd(7) for include usage.)
void
explicit_bzero(void *buf, size_t len);

DESCRIPTION

The explicit_bzero() function writes len zero bytes to the string buf. If len is zero, explicit_bzero() does nothing.

The explicit_bzero() variant behaves the same as the bzero() function, 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

bzero(3), memset(3), swab(3)

HISTORY

The explicit_bzero() function first appeared in OpenBSD 5.5, glibc 2.25.
January 22, 2014 Linux 4.19.0-14-amd64