[#BIO_number_read]
= BIO&lowbar;number&lowbar;read
:mrdocs:

Return the cumulative number of bytes successfully read through a BIO&period;

== Synopsis

Declared in `&lt;openssl&sol;bio&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
uint64&lowbar;t
BIO&lowbar;number&lowbar;read(xref:BIO.adoc[BIO]* bio);
----

== Return Value

Total bytes read since the BIO was created&period;

== Parameters

[cols="1,4"]
|===
| Name| Description
| *bio*
| BIO whose read counter is queried&period;
|===


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