1=pod 2 3=head1 NAME 4 5BIO_s_null - null data sink 6 7=head1 SYNOPSIS 8 9 #include <openssl/bio.h> 10 11 const BIO_METHOD *BIO_s_null(void); 12 13=head1 DESCRIPTION 14 15BIO_s_null() returns the null sink BIO method. Data written to 16the null sink is discarded, reads return EOF. 17 18=head1 NOTES 19 20A null sink BIO behaves in a similar manner to the Unix /dev/null 21device. 22 23A null bio can be placed on the end of a chain to discard any data 24passed through it. 25 26A null sink is useful if, for example, an application wishes to digest some 27data by writing through a digest bio but not send the digested data anywhere. 28Since a BIO chain must normally include a source/sink BIO this can be achieved 29by adding a null sink BIO to the end of the chain 30 31=head1 RETURN VALUES 32 33BIO_s_null() returns the null sink BIO method. 34 35=head1 COPYRIGHT 36 37Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved. 38 39Licensed under the Apache License 2.0 (the "License"). You may not use 40this file except in compliance with the License. You can obtain a copy 41in the file LICENSE in the source distribution or at 42L<https://www.openssl.org/source/license.html>. 43 44=cut 45