[#BIO_ctrl_pending]
= BIO&lowbar;ctrl&lowbar;pending
:mrdocs:

Return the number of bytes buffered for reading in a BIO (ctrl pending read count)&period;

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
size&lowbar;t
BIO&lowbar;ctrl&lowbar;pending(xref:BIO.adoc[BIO]* b);
----

== Return Value

Pending readable byte count&period;

== Parameters

[cols="1,4"]
|===
| Name| Description
| *b*
| BIO to query&period;
|===


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