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=pod =head1 NAME BIO_f_null - null filter =head1 SYNOPSIS #include <openssl/bio.h> BIO_METHOD * BIO_f_null(void); =head1 DESCRIPTION BIO_f_null() returns the null filter BIO method. This is a filter BIO that does nothing. 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. =head1 NOTES As may be apparent a null filter BIO is not particularly useful. =head1 RETURN VALUES BIO_f_null() returns the null filter BIO method. =head1 SEE ALSO TBA