From aa50d0be344aefd8ec0fa47166d07728898929a3 Mon Sep 17 00:00:00 2001
From: Ivan Babrou <ivan@cloudflare.com>
Date: Wed, 25 Sep 2024 15:18:41 -0700
Subject: [PATCH] Add LifecycleHandler::pre_new_process

---
 src/lib.rs       | 2 ++
 src/lifecycle.rs | 3 +++
 2 files changed, 5 insertions(+)

diff --git a/src/lib.rs b/src/lib.rs
index c83a110..7146b8d 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -412,6 +412,8 @@ async fn spawn_child(
     user_envs: &[(OsString, OsString)],
     lifecycle_handler: &mut dyn LifecycleHandler,
 ) -> io::Result<process::Child> {
+    lifecycle_handler.pre_new_process().await;
+
     let mut args = env::args();
     let process_name = args.next().unwrap();
 
diff --git a/src/lifecycle.rs b/src/lifecycle.rs
index e0583ad..79f011e 100644
--- a/src/lifecycle.rs
+++ b/src/lifecycle.rs
@@ -19,6 +19,9 @@ pub trait LifecycleHandler: Send {
         Ok(())
     }
 
+    /// Called before the child process has been spawned.
+    async fn pre_new_process(&mut self) {}
+
     /// Called after `send_to_new_process` if the child process fails to start successfully.
     /// This gives you an opportunity to undo any state changes made in `send_to_new_process`.
     async fn new_process_failed(&mut self) {}