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.\"
.IX Title "BIO_s_null 3"
.TH BIO_s_null 3 "2019-12-20" "1.0.2u" "OpenSSL"
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.SH "NAME"
BIO_s_null \- null data sink
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/bio.h>
\&
\& BIO_METHOD *   BIO_s_null(void);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBBIO_s_null()\fR returns the null sink \s-1BIO\s0 method. Data written to
the null sink is discarded, reads return \s-1EOF.\s0
.SH "NOTES"
.IX Header "NOTES"
A null sink \s-1BIO\s0 behaves in a similar manner to the Unix /dev/null
device.
.PP
A null bio can be placed on the end of a chain to discard any data
passed through it.
.PP
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 \s-1BIO\s0 chain must normally include a source/sink \s-1BIO\s0 this can be achieved
by adding a null sink \s-1BIO\s0 to the end of the chain
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBBIO_s_null()\fR returns the null sink \s-1BIO\s0 method.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\s-1TBA\s0

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