[#ENGINE_CMD_DEFN_st]
= ENGINE_CMD_DEFN_st
:mrdocs:

Describes one ENGINE‐specific control command for ENGINE_set_cmd_defns().

== Synopsis

Declared in `<openssl/engine.h>`

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

== Description

Arrays of these are null‐terminated: the last element has cmd_num 0 and/or cmd_name NULL. Entries must be ordered by increasing cmd_num.

== Data Members

[cols="1,4"]
|===
| Name| Description
| xref:ENGINE_CMD_DEFN_st/cmd_desc.adoc[`cmd_desc`] 
| Short human‐readable description of the command.
| xref:ENGINE_CMD_DEFN_st/cmd_flags.adoc[`cmd_flags`] 
| Bitmask of ENGINE_CMD_FLAG_* describing the expected input form.
| xref:ENGINE_CMD_DEFN_st/cmd_name.adoc[`cmd_name`] 
| NUL‐terminated command name used by ENGINE_ctrl_cmd() and config strings.
| xref:ENGINE_CMD_DEFN_st/cmd_num.adoc[`cmd_num`] 
| Numeric identifier of the command (ENGINE_CMD_BASE and above for custom commands).
|===



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