android中recv()总是返回-1

发布于 2025-01-20 01:20:42 字数 1169 浏览 0 评论 0原文

我需要使用本机代码（在特定性）上通过Android上的插座在Localhost上发送几个字符串，但是我遇到了奇怪的问题-Recv（）函数始终返回-1，Eerno告诉“重试！”

这是负责插座初始化和接收响应的代码，

void request() {

    struct sockaddr_in sa;
    memset(&sa, 0, sizeof(sa));
    sa.sin_family = AF_INET;
    //need to send string to localhost
    inet_aton("127.0.0.1", &(sa.sin_addr));
   
    int sock;
    char res[7];
    
    sock = socket(AF_INET, SOCK_STREAM, 0);
    sa.sin_port = htons(27042);
    int connection = connect(sock, (struct sockaddr *) &sa, sizeof sa);
    if (connection != -1) { //connection >= 0
        memset(res, 0, 7);

        send(sock, "\x00", 1, NULL);

        send(sock, "AUTH\r\n", 6, NULL);

        usleep(100); // Give it some time to answer

        int rec = recv(sock, res, 7, MSG_DONTWAIT);

        // rec is always -1 and errno says "Try again!"

    }

    close(sock);
}

清单>清单文件中有Internet权限。

我试图将recv（袜子，Res，7，MSG_DONTWAIT）零件放在循环中等待时，也许它会返回一些数据，但没有成功。也许我需要在send（）之后打电话给flush（）之类的东西？

有人知道在哪里可能有麻烦吗？

upd。此代码在一个Android应用程序（客户端）中运行，并试图将字符串发送到在同一设备（服务器）上运行的其他Android应用程序。

原文

I need to send few strings on localhost via socket on android using native code (in C particularity) but I've faced weird problem - recv() function always returns -1 and eerno tells "Try again!"

Here is code responsible for initialization of socket and receiving response

void request() {

    struct sockaddr_in sa;
    memset(&sa, 0, sizeof(sa));
    sa.sin_family = AF_INET;
    //need to send string to localhost
    inet_aton("127.0.0.1", &(sa.sin_addr));
   
    int sock;
    char res[7];
    
    sock = socket(AF_INET, SOCK_STREAM, 0);
    sa.sin_port = htons(27042);
    int connection = connect(sock, (struct sockaddr *) &sa, sizeof sa);
    if (connection != -1) { //connection >= 0
        memset(res, 0, 7);

        send(sock, "\x00", 1, NULL);

        send(sock, "AUTH\r\n", 6, NULL);

        usleep(100); // Give it some time to answer

        int rec = recv(sock, res, 7, MSG_DONTWAIT);

        // rec is always -1 and errno says "Try again!"

    }

    close(sock);
}

There is an INTERNET permission in Manifest file.

I've tried to put recv(sock, res, 7, MSG_DONTWAIT) part in while loop to wait maybe it would return some data but no success. Maybe I need to call something like flush() after send()?

Does any one know where could be trouble?

UPD. This code runs in one android app (client) and tries to send string to other android app that runs on the same device (server).

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