1.Dd July 17, 2014 2.Dt BIO_F_NULL 3 3.Os 4.Sh NAME 5.Nm BIO_f_null 6.Nd null filter 7.Sh SYNOPSIS 8.In openssl/bio.h 9.Ft BIO_METHOD * 10.Fo BIO_f_null 11.Fa void 12.Fc 13.Sh DESCRIPTION 14.Fn BIO_f_null 15returns the null filter BIO method. 16This is a filter BIO that does nothing. 17.Pp 18All requests to a null filter BIO are passed through to the next BIO 19in the chain: this means that a BIO chain containing a null filter BIO 20behaves just as though the BIO was not there. 21.Sh NOTES 22As may be apparent, a null filter BIO is not particularly useful. 23.Sh RETURN VALUES 24.Fn BIO_f_null 25returns the null filter BIO method. 26