[#PKCS7_ctrl]
= PKCS7_ctrl
:mrdocs:

Perform a control operation on a PKCS#7 object (for example set/get detached signature).

== Synopsis

Declared in `<openssl/pkcs7.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
long
PKCS7_ctrl(
    xref:PKCS7.adoc[PKCS7]* p7,
    int cmd,
    long larg,
    char* parg);
----

== Return Value

Command‐specific long result; for set/get detached, the detached flag (non‐zero when detached).

== Parameters

[cols="1,4"]
|===
| Name| Description
| *p7*
| PKCS#7 object to modify or query.
| *cmd*
| Control code such as PKCS7_OP_SET_DETACHED_SIGNATURE or PKCS7_OP_GET_DETACHED_SIGNATURE.
| *larg*
| Integer argument interpreted according to `cmd` (for example detached flag).
| *parg*
| Optional pointer argument for `cmd,` or NULL when unused.
|===


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