我可以在0mq(zeromq)ipc套接字上传递文件描述符吗? [英] Can I pass a file descriptor over a 0mq (zeromq) ipc socket?

问题描述

我有一个主进程和几个工作人员，使用0mq'ipc://'套接字(UNIX域套接字)进行通信.我想将文件描述符从主服务器传递到工作程序，以及一条消息.我知道可以使用原始" UNIX域套接字将文件描述符从一个进程传递到另一个进程，但是我可以使用zeromq套接字吗?

I have a master process and several workers, communicating using 0mq 'ipc://' sockets (UNIX domain sockets). I want to pass a file descriptor from the master to a worker, along with a message. I know that 'raw' UNIX domain sockets can be used to pass a file descriptor from one process to another, but can I do it with my zeromq sockets?

我不在乎可移植性，坦率地说，我不在乎它的解决方案是否有点脏.有什么办法吗?

I don't care about portability, and frankly I don't care if its a slightly dirty solution. Is there any way?

谢谢.

推荐答案

最麻烦的方法是添加一个套接字选项，将文件描述符绑定到套接字，然后替换send()& recv()以及sendmsg()和recvmsg()的每个CMSG结构，以传递描述符.

Hackiest method would be to add a socket option to bind a file descriptor to the socket, then replace the send() & recv() with sendmsg() and recvmsg() per the required CMSG structure to pass the descriptor.

作为全局选项，每条消息都将用描述符标记，因此您应在有效负载内添加适当的元数据，以指示接收者应使用随附的描述符.

As a global option every message would be tagged with the descriptor thus you should add suitable meta-data within the payload to indicate that the receiver should take the accompanying descriptor.

例如发送端

zmq_setsockopt (s, ZMQ_ANCILLIARYFD, &fd, sizeof (fd));

例如接收端

int incoming_fd;
size_t fd_len = sizeof (incoming_fd);
zmq_getsockopt (s, ZMQ_ANCILLIARYFD, &incoming_fd, &fd_len);

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