linux udp 客户端recvfrom，一直没有数据接收，谁能帮看看这代码哪里出了问题了？？？？

来源：互联网发布：机顶盒软件编辑：程序博客网时间：2024/05/01 23:46

void* StartDiscoveryThread(void *arg){int so_broadcast=1;struct sockaddr_in toAddr;  //客户端的网络地址。struct sockaddr_in serverAddr;  //服务器端的网络地址。char inBuff[DD_BUFF_LEN];int sockaddrLen = 0;int inLen;int ret;NETPARAM stRespond = {0};int rsock = createUDPSokcet(TF6x0_PORT);while(1){sockaddrLen = sizeof(toAddr);inLen = recvfrom(rsock, inBuff, DD_BUFF_LEN, 0, (struct sockaddr*)&toAddr,(socklen_t*)&sockaddrLen);if(inLen<=0){DD_DEBUG("recv failed! skip, continue ...");sleep(1);}else{ret = memcmp(inBuff,CONST_MESSAGE,strlen(CONST_MESSAGE));if(0!=ret){continue;}else{////填充需要发送的信息netGetIPAddr(DD_IFace, &(stRespond.ip));stRespond.dev_model = 1111;///toAddr.sin_addr.s_addr = inet_addr("255.255.255.255");///toAddr.sin_port  = htons(TF6x0_PORT);sockaddrLen = sizeof(struct sockaddr);ret = sendto(rsock,&stRespond,sizeof(stRespond),0,(struct sockaddr*)&toAddr, sizeof(toAddr));if(ret < 0){  printf("send failed!\n");                        }else{printf("server sned to client(ip:%s port:%d)success ret=%d %d\n", inet_ntoa(toAddr.sin_addr),ntohs(toAddr.sin_port), ret, __LINE__);continue;}}}sleep(3);    }close(rsock);///close(wsock);return NULL;}int DiscoveryClientHandle(std::list<NETPARAM> &lis){int sock = -1, retVal = -1;int fBroadcast;struct sockaddr_in addrSrc;struct sockaddr_in addrDst;int sockaddrLen = sizeof(struct sockaddr_in);NETPARAM resp; char buf[1024] = {0};if(sock<0){sock = createUDPSokcet(LOCAL_PORT);memset(&addrSrc, 0, sockaddrLen);addrSrc.sin_family  = AF_INET;addrSrc.sin_addr.s_addr = htonl(INADDR_BROADCAST);addrSrc.sin_port  = htons(LOCAL_PORT);memset(&addrDst, 0, sockaddrLen);addrDst.sin_family  = AF_INET;addrDst.sin_addr.s_addr = htonl(INADDR_BROADCAST);addrDst.sin_port  = htons(TF6x0_PORT);retVal = sendto(sock, CONST_MESSAGE,strlen(CONST_MESSAGE),0,(struct sockaddr*)&addrDst, sizeof(addrDst));if (retVal <0){printf("DiscoveryClientHandle send faile\n");}else{do{sockaddrLen = sizeof(addrSrc);printf("client send %s to(ip:%s, prot:%d) success, now accept the server info line:%d \n",CONST_MESSAGE, inet_ntoa(addrDst.sin_addr),ntohs(addrDst.sin_port), __LINE__);retVal = recvfrom(sock, buf, 1024, 0, (struct sockaddr *)&addrSrc, (socklen_t*)&sockaddrLen);if(-1 == retVal){printf("recvfrom error------------------\n");break;}else{printf("get ip(%d.%d.%d.%d) dev_model=%d!\r\n", (resp.ip)&0xff, (resp.ip>>8)&0xff, (resp.ip>>16)&0xff, (resp.ip>>24)&0xff,resp.dev_model);lis.push_back(resp);}usleep(1000);}while(1);}}close(sock);return 1;}int devDiscovery(void)   {int ret;if(0!=Discoveryid) return -1;ret= pthread_create(&Discoveryid,0,StartDiscoveryThread,0);return ret;}

上面代码有一个是个服务端 被搜索的代码，客户端广播一个搜索信号，如果设备接收到客户端的搜索信息，就把设备的ip以及一些信息发送到客户端，客户端对这些信息进行保存，说白了就是一个搜索设备的两端，现在的问题是客户端接收不到信息，一直卡在recvfrom这里，我这里暂时没做超时处理和非阻塞。我想问这里到底什么问题？？？？？？？？？？？

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