[#bio_msg_st-data_len]
= xref:bio_msg_st.adoc[bio_msg_st]::data_len
:relfileprefix: ../
:mrdocs:

Length of `data` in bytes (send length or receive buffer capacity).

== Synopsis

Declared in `<openssl/bio.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
size_t data_len;
----


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