BIO_s_null - null data sink

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       Licensed under the Apache License 2.0 (the "License").  You may not use this file except in compliance
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3.5.0                                              2025-06-04                                   BIO_S_NULL(3SSL)

BIO_s_null() returns the null sink BIO method. Data written to the null sink is discarded, reads return
       EOF.

       BIO_s_null - null data sink

       A null sink BIO behaves in a similar manner to the Unix /dev/null device.

       A null bio can be placed on the end of a chain to discard any data passed through it.

       A null sink is useful if, for example, an application wishes to digest some data by writing through a
       digest bio but not send the digested data anywhere.  Since a BIO chain must normally include a
       source/sink BIO this can be achieved by adding a null sink BIO to the end of the chain

BIO_s_null() returns the null sink BIO method.

        #include <openssl/bio.h>

        const BIO_METHOD *BIO_s_null(void);