[#BIO_ctrl_get_write_guarantee]
= BIO_ctrl_get_write_guarantee
:mrdocs:

Return how many bytes can currently be written without blocking or growing buffers.

== Synopsis

Declared in `<openssl/bio.h>`

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

== Return Value

Guaranteed writable byte count.

== Parameters

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


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