[#BIO_pop]
= BIO&lowbar;pop
:mrdocs:

Remove the first BIO from a chain 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;pop(xref:BIO.adoc[BIO]* b);
----

== Return Value

The next BIO in the chain, or NULL if `b` was the last BIO&period;

== Parameters

[cols="1,4"]
|===
| Name| Description
| *b*
| BIO at the head of a chain (may be the only BIO)&period;
|===


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