[#BASIC_CONSTRAINTS_st]
= BASIC_CONSTRAINTS_st
:mrdocs:

Basic Constraints extension: whether the subject is a CA and optional path length.

== Synopsis

Declared in `<openssl/x509v3.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
struct BASIC_CONSTRAINTS_st;
----

== Data Members

[cols="1,4"]
|===
| Name| Description
| xref:BASIC_CONSTRAINTS_st/ca.adoc[`ca`] 
| Non‐zero if the subject may act as a certification authority.
| xref:BASIC_CONSTRAINTS_st/pathlen.adoc[`pathlen`] 
| Maximum number of intermediate CA certificates below this CA, or NULL if unlimited.
|===



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