Python多进程Pipe报错“管道已关闭”：如何优雅地处理父子进程通信中的EOFError？

import os
from multiprocessing import Process, Pipe

def start_child_process(child_conn):
    child_conn.send({"port": 123, "ret": 1, "pid": os.getpid()})
    try:
        signal = child_conn.recv()  # 等待主进程信号
        if signal:
            child_conn.close()
    except EOFError as e:
        print(f"Pipe closed gracefully: {e}")  # 优雅处理EOFError


class Server:
    def __init__(self):
        self.parent_conn, self.child_conn = Pipe()
        self.child = None

    def run(self):
        self.child = Process(target=start_child_process, args=(self.child_conn,))
        self.child.start()
        data = self.parent_conn.recv()
        result = {"endpoints": {"http": f"http://127.0.0.1:{data['port']}/cmd", "ws": f"ws://127.0.0.1:{data['port']}/api"}}
        return result

    def stop(self):
        self.parent_conn.send(True)
        self.child.join()
        self.child = None

if __name__ == "__main__":
    server = Server()
    r = server.run()
    print("r:", r)

from service import Server
import time

def main():
    server = Server()
    result = server.run()
    print("r:", result)
    time.sleep(5)
    server.stop() # 解除注释，测试优雅退出


if __name__ == "__main__":
    main()