[#CRYPTO_EX_dup]
= CRYPTO_EX_dup
:mrdocs:

Callback that duplicates one ex_data slot when an object is copied.

== Synopsis

Declared in `<openssl/crypto.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
typedef int CRYPTO_EX_dup(xref:CRYPTO_EX_DATA.adoc[CRYPTO_EX_DATA]*, xref:CRYPTO_EX_DATA.adoc[CRYPTO_EX_DATA] const*, void**, int, long, void*);
----

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *to*
| Destination ex‐data bag.
| *from*
| Source ex‐data bag.
| *from_d*
| Address of the source slot pointer; may be updated to the duplicated value.
| *idx*
| Ex‐data index being duplicated.
| *argl*
| Long argument registered with CRYPTO_get_ex_new_index().
| *argp*
| Pointer argument registered with CRYPTO_get_ex_new_index().
|===


[.small]#Created with https://www.mrdocs.com[MrDocs]#