[#OSSL_CMP_CTX_set_transfer_cb]
= OSSL_CMP_CTX_set_transfer_cb
:mrdocs:

Replace the message transfer callback used by the CMP client.

== Synopsis

Declared in `<openssl/cmp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
OSSL_CMP_CTX_set_transfer_cb(
    xref:OSSL_CMP_CTX.adoc[OSSL_CMP_CTX]* ctx,
    xref:OSSL_CMP_transfer_cb_t.adoc[OSSL_CMP_transfer_cb_t] cb);
----

== Return Value

1 on success, 0 on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| CMP context.
| *cb*
| Transfer callback, or NULL to restore the default HTTP transfer.
|===


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