=pod
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=head1 NAME
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BIO_f_null - null filter
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=head1 SYNOPSIS
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#include <openssl/bio.h>
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BIO_METHOD * BIO_f_null(void);
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=head1 DESCRIPTION
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BIO_f_null() returns the null filter BIO method. This is a filter BIO
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that does nothing.
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All requests to a null filter BIO are passed through to the next BIO in
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the chain: this means that a BIO chain containing a null filter BIO
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behaves just as though the BIO was not there.
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=head1 NOTES
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As may be apparent a null filter BIO is not particularly useful.
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=head1 RETURN VALUES
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BIO_f_null() returns the null filter BIO method.
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=head1 SEE ALSO
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TBA
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