[#BIO_sendmmsg]
= BIO_sendmmsg
:mrdocs:

Send multiple messages through a BIO (sendmmsg‐style interface).

== Synopsis

Declared in `<openssl/bio.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
BIO_sendmmsg(
    xref:BIO.adoc[BIO]* b,
    xref:BIO_MSG.adoc[BIO_MSG]* msg,
    size_t stride,
    size_t num_msg,
    uint64_t flags,
    size_t* msgs_processed);
----

== Return Value

1 on success, or 0 on failure (see BIO_should_retry).

== Parameters

[cols="1,4"]
|===
| Name| Description
| *b*
| Destination BIO supporting multi‐message send.
| *msg*
| Array (or strided sequence) of BIO_MSG descriptors to send.
| *stride*
| Byte stride between consecutive BIO_MSG elements (usually sizeof(BIO_MSG)).
| *num_msg*
| Number of messages in the `msg` sequence.
| *flags*
| Operation flags passed to the BIO method implementation.
| *msgs_processed*
| Receives how many messages were successfully processed, or NULL.
|===


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