RPC编程：关于广播包的编程：跪求大神！！！

chenshi1991 2014-11-09 12:59:05

大神们！！！我现在用在linux上用RPC编程，在客户端用clnt_broadcas（）函数向以太网中发广播包，服务器接收广播包并用svc_sendreply()函数返回自己的信息，这样客户端就可以知道这个以太网上所有的服务器的IP信息等等。可是客户端的广播包发过后有的主机可以接受，有的不可以接受，这是怎么回事呀，求大神指点！！！！

客户端： rpc_stat    = clnt_broadcast(DEVICE_CORE, DEVICE_CORE_VERSION, NULLPROC, 

                      xdr_void, (char *)NULL,                           //in  params

                                  (xdrproc_t)xdr_wrapstring, (caddr_t) &clnt_res,   //ret params

                                  coreresult);





服务器：

static void device_core_1(struct svc_req *rqstp, SVCXPRT *transp)

{

        union {

                Create_LinkParms      create_link_1_arg;

                Device_WriteParms     device_write_1_arg;

                Device_ReadParms      device_read_1_arg;

                Device_GenericParms   device_readstb_1_arg;

                Device_GenericParms   device_trigger_1_arg;

                Device_GenericParms   device_clear_1_arg;

                Device_GenericParms   device_remote_1_arg;

                Device_GenericParms   device_local_1_arg;

                Device_LockParms      device_lock_1_arg;

                Device_Link           device_unlock_1_arg;

                Device_EnableSrqParms device_enable_srq_1_arg;

                Device_DocmdParms     device_docmd_1_arg;

                Device_Link           destroy_link_1_arg;

                Device_RemoteFunc     create_intr_chan_1_arg;

        } argument;

        char          *result, corereply[20];

        //bool_t     (*xdr_argument)(), (*xdr_result)();

        xdrproc_t      xdr_argument, xdr_result;

        char        *(*local)(DOTS);



#ifdef MULTITHREAD

        DWORD TID           = 0;

        HANDLE threadHandle = NULL;

        struct call_params *params;

#endif



        switch (rqstp->rq_proc) 

        {

                case NULLPROC:

            //result   = lxiInstrAttr[0].DevName;

            strcpy(corereply,"Core:CE41 LXI-VXI");

                        result     = corereply;

                        result[17] = 0;

                        xdr_result = (xdrproc_t)xdr_wrapstring; //xdr_char;  //xdr_void; //xdr_wrapstring;

                        //printf("\n%s", result);

                        (void)svc_sendreply(transp, xdr_result, (caddr_t)&result);

                        //break;

                        return;



                case create_link:

                        xdr_argument = (xdrproc_t)xdr_Create_LinkParms;

                        xdr_result   = (xdrproc_t)xdr_Create_LinkResp;

                        local        = (char *(*)(DOTS)) create_link_svc_1;

                        break;



                case device_write:

                        xdr_argument = (xdrproc_t)xdr_Device_WriteParms;

                        xdr_result   = (xdrproc_t)xdr_Device_WriteResp;

                        local        = (char *(*)(DOTS)) device_write_svc_1;

                        break;



                case device_read:

                        xdr_argument = (xdrproc_t)xdr_Device_ReadParms;

                        xdr_result   = (xdrproc_t)xdr_Device_ReadResp;

                        local        = (char *(*)(DOTS)) device_read_svc_1;

                        break;

}