[#BN_GENCB_call]
= BN_GENCB_call
:mrdocs:

Invoke a BN_GENCB progress callback with event codes `a` and `b.`

== Synopsis

Declared in `<openssl/bn.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
BN_GENCB_call(
    xref:BN_GENCB.adoc[BN_GENCB]* cb,
    int a,
    int b);
----

== Return Value

1 to continue, or 0 if the callback requested cancellation.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *cb*
| Callback object populated with BN_GENCB_set() or BN_GENCB_set_old(); NULL is ignored.
| *a*
| Primary event / stage code passed to the callback.
| *b*
| Secondary progress value passed to the callback.
|===


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