examples/plugins/rust: add thread init callback

Author: jasonish

examples/plugins/README.md

@@ -18,4 +18,5 @@ Most code copied from rust/src/applayertemplate
 ## rust
 
 A pure Rust plugin example intended to grow into an omnibus plugin example.
-Currently demonstrates plugin initialization and EVE callback registration.
+Currently demonstrates plugin initialization, EVE callback registration,
+and thread init callback registration.

examples/plugins/rust/README.md

@@ -3,3 +3,5 @@
 This is a pure Rust Suricata plugin example.
 
 It is intended to grow into an omnibus Rust plugin example over time.
+Currently it demonstrates plugin initialization, EVE callback registration,
+and thread init callback registration.

examples/plugins/rust/src/mod.rs

@@ -1,4 +1,5 @@
 mod eve;
+mod thread;
 
 use suricata_ffi::{SCLogError, SCLogNotice};
 use suricata_sys::sys::SCPlugin;
@@ -10,6 +11,12 @@ unsafe extern "C" fn init() {
     if let Err(err) = eve::register() {
         SCLogError!("Failed to register rust example EVE callback: {}", err);
     }
+    if let Err(err) = thread::register() {
+        SCLogError!(
+            "Failed to register rust example thread init callback: {}",
+            err
+        );
+    }
 }
 
 #[no_mangle]

examples/plugins/rust/src/thread.rs

@@ -0,0 +1,10 @@
+use suricata_ffi::{thread, SCLogNotice};
+use suricata_sys::sys::ThreadVars;
+
+pub(crate) fn register() -> Result<(), &'static str> {
+    thread::register_init_callback(|tv: *mut ThreadVars| {
+        SCLogNotice!("Thread initialization callback (tv={:p})", tv);
+    })?;
+
+    Ok(())
+}