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+.\" -*- mode: troff; coding: utf-8 -*-
+.\" Automatically generated by Pod::Man v6.0.2 (Pod::Simple 3.45)
+.\"
+.\" Standard preamble:
+.\" ========================================================================
+.de Sp \" Vertical space (when we can't use .PP)
+.if t .sp .5v
+.if n .sp
+..
+.de Vb \" Begin verbatim text
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+..
+.de Ve \" End verbatim text
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+.fi
+..
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+.\" Escape single quotes in literal strings from groff's Unicode transform.
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+.el       .ds Aq '
+.\"
+.\" If the F register is >0, we'll generate index entries on stderr for
+.\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index
+.\" entries marked with X<> in POD.  Of course, you'll have to process the
+.\" output yourself in some meaningful fashion.
+.\"
+.\" Avoid warning from groff about undefined register 'F'.
+.de IX
+..
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+.\}
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+.\"
+.\" Required to disable full justification in groff 1.23.0.
+.if n .ds AD l
+.\" ========================================================================
+.\"
+.IX Title "BIO_S_NULL 3ossl"
+.TH BIO_S_NULL 3ossl 2026-04-07 3.5.6 OpenSSL
+.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
+.\" way too many mistakes in technical documents.
+.if n .ad l
+.nh
+.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 BIO method. Data written to
+the null sink is discarded, reads return EOF.
+.SH NOTES
+.IX Header "NOTES"
+A null sink BIO 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 BIO chain must normally include a source/sink BIO this can be achieved
+by adding a null sink BIO to the end of the chain
+.SH "RETURN VALUES"
+.IX Header "RETURN VALUES"
+\&\fBBIO_s_null()\fR returns the null sink 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>.