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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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  .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 \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>.
  