BIO_F_NULL(3) | Library Functions Manual | BIO_F_NULL(3) |
NAME
BIO_f_null
— null
filter
SYNOPSIS
#include
<openssl/bio.h>
const BIO_METHOD *
BIO_f_null
(void);
DESCRIPTION
BIO_f_null
()
returns the null filter BIO method. This is a filter BIO that does nothing.
As may be apparent, a null filter BIO is not particularly useful.
All requests to a null filter BIO are passed through to the next BIO in the chain: this means that a BIO chain containing a null filter BIO behaves just as though the BIO was not there.
A chain containing a null filter BIO cannot be copied with
BIO_dup_chain(3), and any
attempt to do so fails and returns NULL
.
RETURN VALUES
BIO_f_null
() returns the null filter BIO
method.
When called on a null filter BIO object,
BIO_method_type(3)
returns the constant BIO_TYPE_NULL_FILTER
and
BIO_method_name(3)
returns a pointer to the static string "NULL filter", not to be
confused with a NUL string nor with a NULL
pointer
.
SEE ALSO
HISTORY
BIO_f_null
() first appeared in SSLeay
0.8.0 and has been available since OpenBSD 2.4.
April 11, 2023 | Linux 6.8.2-arch2-1 |