Java - Mac系统下unix domain socket报错：message too long

实测Mac使用该协议_（SOCK_DGRAM类型），数据包长度超过2048就会报错。但是Ubuntu下不会。

SOCK_DGRAM类型按理说应该可以发送64K大小啊。

求解

Mac系统的长度没这么长吧

修改GCDAsyncUdpSocket.m 文件，添加：

 /**
         * The theoretical maximum size of any IPv4 UDP packet is UINT16_MAX = 65535.
         * The theoretical maximum size of any IPv6 UDP packet is UINT32_MAX = 4294967295.
         *
         * The default maximum size of the UDP buffer in iOS is 9216 bytes.
         *
         * This is the reason of #222(GCD does not necessarily return the size of an entire UDP packet) and
         *  #535(GCDAsyncUDPSocket can not send data when data is greater than 9K)
         *
         *
         * Enlarge the maximum size of UDP packet.
         * I can not ensure the protocol type now so that the max size is set to 65535 :)
         **/
        int maximumBufferSize = 65535;

        status = setsockopt(socketFD, SOL_SOCKET, SO_SNDBUF, (const char*)&maximumBufferSize, sizeof(int));
        if (status == -1)
        {
            if (errPtr)
                *errPtr = [self errnoErrorWithReason:@"Error setting send buffer size (setsockopt)"];
            close(socketFD);
            return SOCKET_NULL;
        }

        status = setsockopt(socketFD, SOL_SOCKET, SO_RCVBUF, (const char*)&maximumBufferSize, sizeof(int));
        if (status == -1)
        {
            if (errPtr)
                *errPtr = [self errnoErrorWithReason:@"Error setting receive buffer size (setsockopt)"];
            close(socketFD);
            return SOCKET_NULL;
        }