BIO_s_null - Null data sink
BIO_METHOD * BIO_s_null(
BIO_s_null() returns the null sink BIO method. Data written
to the null sink is discarded; reads return EOF.
A null sink BIO behaves in a similar manner to the Unix
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.
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