issues with AF_UNIX file descriptor in gRPC C++

[Satyam Bandarapu]

Hi,

Any one tested AF_UNIX socket file descriptor on gRPC C++? I have issue connecting the client to server. and also I am not sure whether server started with file descriptor or not. appreciated if any one give some points in that front.

I changed hello world example to following:

server.cpp:

int socketFd = socket( AF_UNIX, SOCK_STREAM , 0);
 
  struct sockaddr_un server_address;
  server_address.sun_family = AF_UNIX;
    strcpy(server_address.sun_path, "server_socket");
    int server_len = sizeof(server_address);
    bind(socketFd, (struct sockaddr *)&server_address, server_len);
 
  std::string server_address2("127.0.0.1:50051");
  GreeterServiceImpl service;


  ServerBuilder builder;
  builder.AddListeningPort(server_address2, grpc::InsecureServerCredentials());
   builder.RegisterService(&service);
 
  std::unique_ptr<Server> server(builder.BuildAndStart());


  grpc::AddInsecureChannelFromFd(server.get(), socketFd);
 
  server->Wait();

  client.cpp

  int socketFd = socket( AF_UNIX, SOCK_STREAM, 0);
    struct sockaddr_un address;
    address.sun_family = AF_UNIX;
    strcpy(address.sun_path, "server_socket");
    int len = sizeof(address);
    int st = connect( socketFd, (struct sockaddr *)&address, sizeof(address) );  


    std::cout << "st " << st << std::endl;
  GreeterClient greeter(grpc::CreateInsecureChannelFromFd("localhost", socketFd));

  if I change the address family to AF_INET then client gets the response from server.