[#CMS_unsigned_delete_attr]
= CMS_unsigned_delete_attr
:mrdocs:

Remove and return the unsigned attribute at an index in a CMS SignerInfo.

== Synopsis

Declared in `<openssl/cms.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:X509_ATTRIBUTE.adoc[X509_ATTRIBUTE]*
CMS_unsigned_delete_attr(
    xref:CMS_SignerInfo.adoc[CMS_SignerInfo]* si,
    int loc);
----

== Return Value

Removed X509_ATTRIBUTE (caller owns it), or NULL on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *si*
| SignerInfo whose unsignedAttrs are modified.
| *loc*
| Zero‐based index of the attribute to remove.
|===


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