if any of our subprocesses exits with a non-zero exit code, we should…

… also exit with a non-zero exit code.

src/hypercorn/__main__.py

@@ -23,7 +23,7 @@ def _load_config(config_path: Optional[str]) -> Config:
         return Config.from_toml(config_path)
 
 
-def main(sys_args: Optional[List[str]] = None) -> None:
+def main(sys_args: Optional[List[str]] = None) -> int:
     parser = argparse.ArgumentParser()
     parser.add_argument(
         "application", help="The application to dispatch to as path.to.module:instance.path"
@@ -284,8 +284,8 @@ def _convert_verify_mode(value: str) -> ssl.VerifyMode:
     if len(args.server_names) > 0:
         config.server_names = args.server_names
 
-    run(config)
+    return run(config)
 
 
 if __name__ == "__main__":
-    main()
+    sys.exit(main())

src/hypercorn/run.py

@@ -15,7 +15,9 @@
 from .utils import load_application, wait_for_changes, write_pid_file
 
 
-def run(config: Config) -> None:
+def run(config: Config) -> int:
+    exit_code = 0
+
     if config.pid_path is not None:
         write_pid_file(config.pid_path)
 
@@ -77,14 +79,20 @@ def shutdown(*args: Any) -> None:
 
         for process in processes:
             process.join()
+            if process.exitcode != 0:
+                exit_code = process.exitcode
+
         for process in processes:
             process.terminate()
 
         for sock in sockets.secure_sockets:
             sock.close()
+
         for sock in sockets.insecure_sockets:
             sock.close()
 
+    return exit_code
+
 
 def start_processes(
     config: Config,