[#BIO_number_written]
= BIO_number_written
:mrdocs:

Return the cumulative number of bytes successfully written through a BIO.

== Synopsis

Declared in `<openssl/bio.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
uint64_t
BIO_number_written(xref:BIO.adoc[BIO]* bio);
----

== Return Value

Total bytes written since the BIO was created.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *bio*
| BIO whose write counter is queried.
|===


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