[#BIO_ctrl_get_read_request]
= BIO_ctrl_get_read_request
:mrdocs:

Return how many bytes the peer half of a BIO pair last tried to read while the buffer was empty.

== Synopsis

Declared in `<openssl/bio.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
size_t
BIO_ctrl_get_read_request(xref:BIO.adoc[BIO]* b);
----

== Return Value

Requested byte count (capped by the write guarantee), or 0 after a successful read or once the request is satisfied.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *b*
| BIO‐pair endpoint to query.
|===


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