Method createSocket

libapp2sys/src/main/cpp/udp.h:660–704

    }

    int createSocket(const char *ip, int port, int timeoutms) {
        if (m_fd > 0) {
            return m_fd;
        }

        this->m_timeoutms = timeoutms;
        srand(time(NULL));

        pthread_mutex_init(&m_mutexSendQueue, NULL);
        int ret = pipe(m_pipefd);
        if (ret < 0) {
            perr("create pipe ret:%d", ret);
            return -1;
        }

        const int fd = socket(AF_INET, SOCK_DGRAM, 0);
        if (fd < 0) {
            perr("create socket fd:%d", fd);
            return -1;
        }

        struct sockaddr_in address;
        memset(&address, 0, sizeof(address));
        address.sin_family = AF_INET;
        address.sin_port = htons(port);

        if (ip == NULL || strlen(ip) == 0) {
            address.sin_addr.s_addr = htonl(INADDR_ANY);
        }
        else {
            inet_pton(AF_INET, ip, &(address.sin_addr));
        }
        const int bindRet = ::bind(fd, (struct sockaddr *) &address, (socklen_t)sizeof(address));
        if (bindRet < 0) {
            perr("create socket bindRet:%d fd:%d %s:%d ", bindRet, fd, ip, port);
            close(fd);
            return -2;
        }

        m_fd = fd;
        m_fdCloseRequested = false;
        pwrn("Create socket succ. fd:%d %s:%d pipe:[%d,%d]", fd, ip, port, m_pipefd[0], m_pipefd[1]);

        return fd;
    }

    int startLoop() {
        return loop();