[#BIO_f_prefix]
= BIO_f_prefix
:mrdocs:

Return the BIO filter method that prefixes each output line with a configurable string.

== Synopsis

Declared in `<openssl/bio.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:BIO_METHOD.adoc[BIO_METHOD] const*
BIO_f_prefix();
----

== Return Value

Pointer to the prefix filter method used with BIO_new().


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