DESCRIPTIONBIO_s_null() returns the null sink BIO method. Data written
to the null sink is discarded, reads return EOF. NOTESA 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
RETURN VALUESBIO_s_null() returns the null sink BIO method. SEE ALSONone.
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