Kill child process and close pty on exit

- Adds kill() method to LibuvUtils.
- Adds close() method to Pipe.

addons/godot_xterm/editor_plugins/terminal/editor_terminal.gd

@@ -88,5 +88,4 @@ func _input(event):
 
 
 func _on_PTY_exited(exit_code: int, signum: int):
-	print("exit_code: ", exit_code, " signum: ", signum)
 	emit_signal("exited", exit_code, signum)

addons/godot_xterm/native/src/libuv_utils.cpp

@@ -9,6 +9,8 @@ void LibuvUtils::_register_methods() {
   register_method("get_os_environ", &LibuvUtils::get_os_environ);
   register_method("get_os_release", &LibuvUtils::get_os_release);
   register_method("get_cwd", &LibuvUtils::get_cwd);
+
+  register_method("kill", &LibuvUtils::kill);
 }
 
 LibuvUtils::LibuvUtils() {}
@@ -61,6 +63,10 @@ String LibuvUtils::get_cwd() {
   return result;
 }
 
+godot_error LibuvUtils::kill(int pid, int signum) {
+  RETURN_UV_ERR(uv_kill(pid, signum));
+}
+
 godot_error LibuvUtils::translate_uv_errno(int uv_err) {
   if (uv_err >= 0)
     return GODOT_OK;

addons/godot_xterm/native/src/libuv_utils.h

@@ -9,7 +9,9 @@
             String(uv_strerror(uv_err)));
 
 #define RETURN_UV_ERR(uv_err)                                                  \
-  UV_ERR_PRINT(uv_err);                                                        \
+  if (uv_err < 0) {                                                            \
+    UV_ERR_PRINT(uv_err);                                                      \
+  }                                                                            \
   return LibuvUtils::translate_uv_errno(uv_err);
 
 #define RETURN_IF_UV_ERR(uv_err)                                               \
@@ -34,6 +36,8 @@ public:
   String get_os_release();
   String get_cwd();
 
+  godot_error kill(int pid, int signum);
+
 public:
   static godot_error translate_uv_errno(int uv_err);
 };

addons/godot_xterm/native/src/pipe.cpp

@@ -31,7 +31,7 @@ void Pipe::_register_methods() {
 }
 
 Pipe::Pipe() {}
-Pipe::~Pipe() {}
+Pipe::~Pipe() { close(); }
 
 void Pipe::_init() {}
 
@@ -39,6 +39,8 @@ void _poll_connection();
 
 void _read_cb(uv_stream_t *handle, ssize_t nread, const uv_buf_t *buf);
 
+void _close_cb(uv_handle_t *handle);
+
 void _write_cb(uv_write_t *req, int status);
 
 void _alloc_buffer(uv_handle_t *handle, size_t suggested_size, uv_buf_t *buf);
@@ -56,6 +58,11 @@ godot_error Pipe::open(int fd, bool ipc = false) {
   return GODOT_OK;
 }
 
+void Pipe::close() {
+  uv_close((uv_handle_t *)&handle, NULL);
+  uv_run(uv_default_loop(), UV_RUN_NOWAIT);
+}
+
 godot_error Pipe::write(String p_data) {
   char *s = p_data.alloc_c_string();
   ULONG len = strlen(s);
@@ -88,10 +95,10 @@ void _read_cb(uv_stream_t *handle, ssize_t nread, const uv_buf_t *buf) {
     switch (nread) {
     case UV_EOF:
       // Normal after shell exits.
-      return;
     case UV_EIO:
       // Can happen when the process exits.
       // As long as PTY has caught it, we should be fine.
+      uv_read_stop(handle);
       return;
     default:
       UV_ERR_PRINT(nread);

addons/godot_xterm/native/src/pipe.h

@@ -23,6 +23,7 @@ public:
   void _init();
 
   godot_error open(int fd, bool ipc);
+  void close();
   int get_status();
 
   godot_error write(String p_data);

addons/godot_xterm/nodes/pty/libuv_utils.gd

@@ -25,5 +25,9 @@ static func get_windows_build_number() -> int:
 	assert(false, "Not implemented.")
 	return 0
 
+static func kill(pid: int, signum: int):
+	if pid > 1:
+		return LibuvUtils.new().kill(pid, signum)
+
 static func new():
 	assert(false, "Abstract sealed (i.e. static) class should not be instantiated.")

addons/godot_xterm/nodes/pty/pty.gd

@@ -212,8 +212,11 @@ func destroy() -> void:
 # Kill the pty.
 # sigint: The signal to send. By default this is SIGHUP.
 # This is not supported on Windows.
-func kill(sigint: int = Signal.SIGHUP) -> void:
+func kill(signum: int = Signal.SIGHUP) -> void:
-	pass
+	if _pipe:
+		_pipe.close()
+	if pid > 0:
+		LibuvUtils.kill(pid, signum)
 
 
 func fork(

addons/godot_xterm/nodes/pty/unix/pty_unix.gd

@@ -42,7 +42,6 @@ func _resize(cols: int, rows: int) -> void:
 
 func _fork_thread(args):
 	var result = preload("./pty_unix.gdns").new().callv("fork", args)
-	print(result)
 	return result
 
 
@@ -88,6 +87,8 @@ func fork(
 		status = STATUS_ERROR
 		return FAILED
 
+	pid = result[1].pid
+
 	_pipe = Pipe.new()
 	_pipe.open(_fd)
 
@@ -101,12 +102,20 @@ func open(cols: int = DEFAULT_COLS, rows: int = DEFAULT_ROWS) -> Array:
 	return PTYUnix.new().open(cols, rows)
 
 
+func _exit_tree():
+	_exit_cb = null
+	if pid > 1:
+		LibuvUtils.kill(pid, Signal.SIGHUP)
+
+
 func _on_pipe_data_received(data):
 	emit_signal("data_received", data)
 
 
 func _on_exit(exit_code: int, signum: int) -> void:
-	emit_signal("exited", exit_code, signum)
+	if is_instance_valid(self):
+		pid = -1
+		emit_signal("exited", exit_code, signum)
 
 
 func _sanitize_env(env: Dictionary) -> Dictionary:

examples/menu/menu.tscn

@@ -20,5 +20,4 @@ script = ExtResource( 1 )
 __meta__ = {
 "_edit_use_anchors_": false
 }
-
 [connection signal="key_pressed" from="Terminal" to="." method="_on_Terminal_key_pressed"]

test/platform/unix/unix.test.gd

@@ -1,5 +1,7 @@
 extends "res://addons/gut/test.gd"
 
+const LibuvUtils := preload("res://addons/godot_xterm/nodes/pty/libuv_utils.gd")
+
 var pty: GDXterm.PTYUnix
 var helper: Helper
 
@@ -51,6 +53,16 @@ func test_open_pty_has_correct_win_size():
 	assert_eq(winsize.rows, rows)
 
 
+func test_closes_pty_on_exit():
+	var num_pts = helper._get_pts().size()
+	pty.fork("sleep", ["1000"])
+	remove_child(pty)
+	pty.free()
+	yield(yield_for(1), YIELD)
+	var new_num_pts = helper._get_pts().size()
+	assert_eq(new_num_pts, num_pts)
+
+
 class Helper:
 	static func _get_pts() -> Array:
 		assert(false, "Abstract method")