[#OPENSSL_sk_unshift]
= OPENSSL_sk_unshift
:mrdocs:

Insert `data` at the front of a generic OPENSSL_STACK.

== Synopsis

Declared in `<openssl/stack.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
OPENSSL_sk_unshift(
    xref:OPENSSL_STACK.adoc[OPENSSL_STACK]* st,
    void const* data);
----

== Return Value

Number of elements after the insert, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *st*
| Stack to modify.
| *data*
| Element pointer to store at index 0.
|===


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