int CreateSocket()
{
socklen_t len;
// Socket creation for UDP
acceptSocket=socket(AF_INET,SOCK_DGRAM,0);
if(acceptSocket==-1)
{
printf("Failure: socket creation is failed, failure code\n");
return 1;
}
else
{
printf("Socket started!\n");
}
memset(&addr, 0, sizeof(addr));
addr.sin_family=AF_INET;
addr.sin_port=htons(port);
addr.sin_addr.s_addr=htonl(INADDR_ANY);
rc=bind(acceptSocket,(struct sockaddr*)&addr,sizeof(addr));
if(rc== -1)
{
printf("Oh dear, something went wrong with bind()! %s\n", strerror(errno));
return 1;
}
else
{
printf("Socket an port %d \n",port);
}
while(rc!=-1)
{
fd_set master;
fd_set read_fds;
int retval;
FD_ZERO(&master);
FD_ZERO(&read_fds);
FD_SET(acceptSocket, &master);
FD_SET(acceptSocket, &read_fds);
retval =select(2, &master, NULL, NULL, NULL);
len = sizeof(client);
if(retval == -1)
{
printf("error\n");
}
else if(FD_ISSET (acceptSocket, &master))
{
rc=recvfrom(acceptSocket,buf, 256, 0, (struct sockaddr*) &client, &len);
if(rc==0)
{
printf("Server has no connection..\n");
break;
}
if(rc==-1)
{
printf("Oh dear, something went wrong with read()! %s\n", strerror(errno));
break;
}
XcpIp_RxCallback((uint16) rc, (uint8*) buf, (uint16) port);
}
else
{
makeTimer("First Timer", &firstTimerID, 2, 2); //2ms
makeTimer("Second Timer", &secondTimerID, 10, 10); //10ms
makeTimer("Third Timer", &thirdTimerID, 100, 100); //100ms
}
}
close(acceptSocket);
return 0;
}
以上是udp層通過ip地址和端口號從客戶端接收數據的服務器代碼。我正在使用select api來檢查通過端口是否有數據,然後接收數據,否則調用定時器函數。我想實現從客戶端接收數據,並在收到我必須調用計時器。但是上面的代碼沒有調用定時器任務。上面代碼中的錯誤是什麼?使用select api有效嗎?如何在udp中使用select api for linux
怎麼樣?民意調查 – kiran
有沒有其他解決方案? – kiran