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.\" ========================================================================
.\"
.IX Title "BIO_S_NULL 3"
.TH BIO_S_NULL 3 "2020-09-22" "1.1.1h" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH "NAME"
BIO_s_null \- null data sink
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/bio.h>
\&
\& const BIO_METHOD *BIO_s_null(void);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBBIO_s_null()\fR returns the null sink \s-1BIO\s0 method. Data written to
the null sink is discarded, reads return \s-1EOF.\s0
.SH "NOTES"
.IX Header "NOTES"
A null sink \s-1BIO\s0 behaves in a similar manner to the Unix /dev/null
device.
.PP
A null bio can be placed on the end of a chain to discard any data
passed through it.
.PP
A null sink is useful if, for example, an application wishes to digest some
data by writing through a digest bio but not send the digested data anywhere.
Since a \s-1BIO\s0 chain must normally include a source/sink \s-1BIO\s0 this can be achieved
by adding a null sink \s-1BIO\s0 to the end of the chain
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBBIO_s_null()\fR returns the null sink \s-1BIO\s0 method.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2000\-2016 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (the \*(L"License\*(R").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.
