node.js域套接字自动断开连接

Question

我的Node.js服务器连接到由C开发的unix套接字。在每个HTTP请求中，参数将发送到C程序并接收响应并发送给客户端。

但是在第一次请求之后，套接字会自动断开连接。断开连接的原因是什么，有什么方法可以阻止它吗？

domain_socket.C

include statement..
int main(){
    /* delete the socket file */
    unlink("/tmp/server_socket");

    /* create a socket */
    int server_sockfd = socket(AF_UNIX, SOCK_STREAM, 0);

    struct sockaddr_un server_addr;
    server_addr.sun_family = AF_UNIX;
    strcpy(server_addr.sun_path, "/tmp/server_socket");

    /* bind with the local file */
    bind(server_sockfd, (struct sockaddr*)&server_addr, sizeof(server_addr));

    /* listen */
    listen(server_sockfd, 5);

    char data[100];
    char res[100];
    int client_sockfd;
    struct sockaddr_un client_addr;
    socklen_t len = sizeof(client_addr);
    while (1) {
        printf("server waiting:\n");

        /* accept a connection */
        client_sockfd = accept(server_sockfd, (struct sockaddr*)&client_addr, &len);

        /* dummy data processing */
        read(client_sockfd, data, 100);
        printf("Received data: \"%s\"\n", data);
        sprintf(res, "path: %s", data);
        printf("send \"%s\" to client.\n", res);

        write(client_sockfd, res, strlen(res));

        /* close the socket */
        close(client_sockfd);
    }

    return 0;
}

app.js

/* require statement */
var app = express();
var client = net.createConnection("/tmp/server_socket");
client.on('connect', function() {
    console.log('Connected to socket');
});

client.on('end', function() {
    console.log('disconnected');
    client = net.createConnection("/tmp/server_socket");
});

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'ejs');

app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

var router = express.Router();

router.get('/query', function(req, res, next) {
    client.write("/home/user/queries/108100.png");
    client.on('data', function(data) {
        res.send(data.toString());
    });
});

app.use('/', router);

module.exports = app;