BIO_f_null − null filter
const BIO_METHOD *BIO_f_null(void);
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.
As may be apparent a null filter BIO is not particularly useful.
BIO_f_null() returns the null filter BIO method.
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