1=pod 2 3=head1 NAME 4 5BIO_f_null - null filter 6 7=head1 SYNOPSIS 8 9 #include <openssl/bio.h> 10 11 const BIO_METHOD *BIO_f_null(void); 12 13=head1 DESCRIPTION 14 15BIO_f_null() returns the null filter BIO method. This is a filter BIO 16that does nothing. 17 18All requests to a null filter BIO are passed through to the next BIO in 19the chain: this means that a BIO chain containing a null filter BIO 20behaves just as though the BIO was not there. 21 22=head1 NOTES 23 24As may be apparent a null filter BIO is not particularly useful. 25 26=head1 RETURN VALUES 27 28BIO_f_null() returns the null filter BIO method. 29 30=head1 COPYRIGHT 31 32Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved. 33 34Licensed under the Apache License 2.0 (the "License"). You may not use 35this file except in compliance with the License. You can obtain a copy 36in the file LICENSE in the source distribution or at 37L<https://www.openssl.org/source/license.html>. 38 39=cut 40