chore: import upstream snapshot with attribution

python/tokenspeed/runtime/utils/process.py

@@ -0,0 +1,78 @@
+# Copyright (c) 2026 LightSeek Foundation
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+
+"""Process and signal helpers."""
+
+from __future__ import annotations
+
+import logging
+import os
+import signal
+import sys
+import threading
+
+import psutil
+
+logger = logging.getLogger(__name__)
+
+
+def register_usr_signal():
+    parent_process = psutil.Process().parent()
+
+    def signal_handler(sig, frame):
+        logger.error("recv usr signal, kill usr signal to parent")
+        parent_process.send_signal(signal.SIGUSR1)
+
+    signal.signal(signal.SIGUSR1, signal_handler)
+
+
+def kill_process_tree(parent_pid, include_parent: bool = True, skip_pid: int = None):
+    """Kill the target process and all of its child processes."""
+    if threading.current_thread() is threading.main_thread():
+        signal.signal(signal.SIGCHLD, signal.SIG_DFL)
+
+    if parent_pid is None:
+        parent_pid = os.getpid()
+        include_parent = False
+
+    try:
+        itself = psutil.Process(parent_pid)
+    except psutil.NoSuchProcess:
+        return
+
+    children = itself.children(recursive=True)
+    for child in children:
+        if child.pid == skip_pid:
+            continue
+        try:
+            child.kill()
+        except psutil.NoSuchProcess:
+            pass
+
+    if include_parent:
+        try:
+            if parent_pid == os.getpid():
+                itself.kill()
+                sys.exit(0)
+
+            itself.kill()
+            itself.send_signal(signal.SIGQUIT)
+        except psutil.NoSuchProcess:
+            pass