是否可以使用Unix套接字在C应用程序和Java应用程序之间创建一个通信？

Question

我有一个服务器应用程序写在C：

int main(int argc, char const *argv[]) {

int sock;

struct sockaddr_un serv_addr;

size_t serv_addr_len;

int msgsock;
char buf[1024];
int msg_len;

remove(SOCKET_ADDRESS);

sock = socket(AF_UNIX, SOCK_SEQPACKET, 0);

if (sock < 0) {
    perror("Opening stream socket");
    exit(1);
}

memset(&serv_addr, 0, sizeof(serv_addr));

serv_addr.sun_family = AF_UNIX;

strcpy(serv_addr.sun_path, SOCKET_ADDRESS);

serv_addr_len = strlen(serv_addr.sun_path) + sizeof(serv_addr.sun_family);

if (bind(sock, (struct sockaddr *) &serv_addr, serv_addr_len)) {
    perror("Binding stream socket");
    exit(1);
}

if (listen(sock, 5) < 0) {
    perror("Listening falied");
    exit(1);
}

while (TRUE) {
    msgsock = accept(sock, (struct sockaddr *) 0, 0);

    if (msgsock == -1) {
        perror("Accept");
    }
    else {
        do {
            memset(buf, 0, sizeof(buf));

            if ((msg_len = recv(msgsock, buf, sizeof(buf), MSG_WAITALL)) < 0) {
                perror("Reading stream message");
            }
            else if (msg_len == 0) {
                printf("Ending connection\n");
            }
            else {
                printf("%s\n", buf);
            }
        } while (msg_len > 0);

        close(msgsock);
    }
}
return 0;
}

并使用junixsocket库在Java上编写客户端：

package client;

import java.io.*;
import org.newsclub.net.unix.AFUNIXSocket;
import org.newsclub.net.unix.AFUNIXSocketAddress;

public class Client {

public static void main(String args[]) {

    final String socketAddress = "/home/andrew/IdeaProjects/Sample/tmp/SOCKET_ADDRESS";

    String message = "Hello Server!";

    try {
        final File socketFile = new File(socketAddress);

        AFUNIXSocket socket = AFUNIXSocket.newInstance();

        socket.connect(new AFUNIXSocketAddress(socketFile));

        OutputStream out = socket.getOutputStream();

        out.write(message.getBytes());
        out.flush();
        socket.close();
    }
    catch (IOException e) {
        e.printStackTrace();
    }
}
}

请帮帮我！

Answer 1

unix域套接字是一种特定于平台的机制，没有本机库的java不支持它。您可以使用org.newsclub.net.unix.afunixsocket。但此库仅支持套接字类型sock_stream和sock_dgram。您的C应用程序使用sock_seqpacket，它是unix域套接字的linux特定扩展，这个库不支持它。