=pod
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=head1 NAME
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BIO_s_null - null data sink
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=head1 SYNOPSIS
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#include <openssl/bio.h>
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BIO_METHOD * BIO_s_null(void);
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=head1 DESCRIPTION
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BIO_s_null() returns the null sink BIO method. Data written to
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the null sink is discarded, reads return EOF.
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=head1 NOTES
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A null sink BIO behaves in a similar manner to the Unix /dev/null
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device.
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A null bio can be placed on the end of a chain to discard any data
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passed through it.
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A null sink is useful if, for example, an application wishes to digest some
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data by writing through a digest bio but not send the digested data anywhere.
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Since a BIO chain must normally include a source/sink BIO this can be achieved
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by adding a null sink BIO to the end of the chain
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=head1 RETURN VALUES
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BIO_s_null() returns the null sink BIO method.
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=head1 SEE ALSO
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TBA
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