i want to write a sever application.my sever have some service to client. some of the answer of my server is long(transfer file) and some of them is short(list of online client).
when server transferring file to a client , other client request to get online client list. i want first job pause and answer the second then return first job.
and my server code is below:
what should i do?!
int runServer(char* pathDir, int portNum)
{
int tcp_socket,maxSelect,activity,newSocket;
struct sockaddr_in server_addr;
int server_addr_length;
tcp_socket = socket(AF_INET,SOCK_STREAM,0); // IPV4 , TCP , IP
if ( tcp_socket==-1 )
{
char handle_error[] = "socket not created so application terminate, please run again.";
write(1,handle_error,strlen(handle_error));
return -1;
}
int opt=TRUE;
if(setsockopt(tcp_socket,SOL_SOCKET,SO_REUSEADDR,(char*)&opt,sizeof(opt))<0)
{
char handle_error ="ERROR: problem in set socket option occurred\n";
write(1,handle_error,strlen(handle_error));
}
server_addr.sin_family = AF_INET; // family address ipv4
server_addr.sin_port= htons(portNum); // port number
server_addr.sin_addr.s_addr = INADDR_ANY; // recieve message from all address
int mybind = bind(tcp_socket,(struct sockaddr*)&server_addr,sizeof(server_addr));
if(mybind==-1)
{
char handle_error[] = " ERROR in binding\n";
write(1,handle_error,strlen(handle_error));
return 0;
}
listen(tcp_socket,MAX_USER);
while(TRUE)
{
FD_ZERO(&readfd);//clear the socket set
FD_SET(tcp_socket,&readfd);//add socket
maxSelect=tcp_socket;
// add child socket
int k;
for(k=0;k<MAX_USER;k++)
{
if(clientList[k].isThere==1)
{
FD_SET(clientList[k].userIdNumber,&readfd);
if(clientList[k].userIdNumber>maxSelect)
maxSelect=clientList[k].userIdNumber;
}
}
activity= select(maxSelect+1,&readfd,NULL,NULL,NULL);
if(FD_ISSET(tcp_socket,&readfd)) //request for connecting
{
function that answer conection request;
}
int y;
for(y=0;y<MAX_USER;y++)
{
find who request and answer to him
}
}
}
