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.\"
.IX Title "BIO_F_NULL 3SSL"
.TH BIO_F_NULL 3SSL 2024-02-03 3.1.5 OpenSSL
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.SH NAME
BIO_f_null \- null filter
.SH SYNOPSIS
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/bio.h>
\&
\& const BIO_METHOD *BIO_f_null(void);
.Ve
.SH DESCRIPTION
.IX Header "DESCRIPTION"
\&\fBBIO_f_null()\fR returns the null filter BIO method. This is a filter BIO
that does nothing.
.PP
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.
.SH NOTES
.IX Header "NOTES"
As may be apparent a null filter BIO is not particularly useful.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBBIO_f_null()\fR returns the null filter BIO method.
.SH COPYRIGHT
.IX Header "COPYRIGHT"
Copyright 2000\-2016 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the Apache License 2.0 (the "License").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file LICENSE in the source distribution or at
<https://www.openssl.org/source/license.html>.