[#BIO_push]
= BIO&lowbar;push
:mrdocs:

Append `append` to the filter chain rooted at `b` and return the new head&period;

== Synopsis

Declared in `&lt;openssl&sol;bio&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:BIO.adoc[BIO]*
BIO&lowbar;push(
    xref:BIO.adoc[BIO]* b,
    xref:BIO.adoc[BIO]* append);
----

== Return Value

`b` (unchanged head pointer)&period;

== Parameters

[cols="1,4"]
|===
| Name| Description
| *b*
| Head of the existing BIO chain&period;
| *append*
| BIO to link after the tail of `b&apos;s` chain&period;
|===


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