[#BIO_write]
= BIO_write
:mrdocs:

Write `dlen` bytes from `data` to a BIO.

== Synopsis

Declared in `<openssl/bio.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
BIO_write(
    xref:BIO.adoc[BIO]* b,
    void const* data,
    int dlen);
----

== Return Value

Number of bytes written, or a negative value on error (see BIO_should_retry).

== Parameters

[cols="1,4"]
|===
| Name| Description
| *b*
| Destination BIO.
| *data*
| Bytes to write.
| *dlen*
| Number of bytes to write (must fit in int).
|===


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