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+.Dd July 17, 2014
+.Dt BIO_F_NULL 3
+.Os
+.Sh NAME
+.Nm BIO_f_null
+.Nd null filter
+.Sh SYNOPSIS
+.In openssl/bio.h
+.Ft BIO_METHOD *
+.Fo BIO_f_null
+.Fa void
+.Fc
+.Sh DESCRIPTION
+.Fn BIO_f_null
+returns the null filter BIO method.
+This is a filter BIO that does nothing.
+.Pp
+All requests to a null filter BIO are passed through to the next BIO
+in the chain: this means that a BIO chain containing a null filter BIO
+behaves just as though the BIO was not there.
+.Sh NOTES
+As may be apparent, a null filter BIO is not particularly useful.
+.Sh RETURN VALUES
+.Fn BIO_f_null
+returns the null filter BIO method.