process.send(message[, sendHandle[, options]][, callback])

• message <Object>
• sendHandle <net.Server> | <net.Socket>
• options <Object> 用于参数化特定类型的句柄的发送。options 支持以下属性：
  • keepOpen <boolean> 当传递 net.Socket 实例时可以使用的值。 当为 true 时，则 socket 在发送的过程中会保持打开。 默认值: false。
• callback <Function>
• 返回: <boolean>

如果 Node.js 是使用 IPC 通道衍生的，则可以使用 process.send() 方法发送消息到父进程。 消息会被接收为父进程的 ChildProcess 对象上的 'message' 事件。

如果 Node.js 不是通过 IPC 通道衍生的，则 process.send 会是 undefined。

消息会进行序列化和解析。 生成的消息可能与最初发送的消息不同。

• message <Object>
• sendHandle <net.Server> | <net.Socket>
• options <Object> used to parameterize the sending of certain types of handles.options supports the following properties:
  • keepOpen <boolean> A value that can be used when passing instances of net.Socket. When true, the socket is kept open in the sending process. Default: false.
• callback <Function>
• Returns: <boolean>

If Node.js is spawned with an IPC channel, the process.send() method can be used to send messages to the parent process. Messages will be received as a 'message' event on the parent's ChildProcess object.

If Node.js was not spawned with an IPC channel, process.send will be undefined.

The message goes through serialization and parsing. The resulting message might not be the same as what is originally sent.