Server does not respond to new clients using select(), cpp - c++

Question

I followed this nice tutorial to create a simple non-blocking server using select() function. Here's what I have:
void setNonBlocking(int socketFD) {
int x;
x = fcntl(socketFD,F_GETFL,0);
fcntl(socketFD,F_SETFL,x | O_NONBLOCK);
return;
}
int initialize(char * port) {
int yes = 1;
listener = socket(PF_INET,SOCK_STREAM, 0);
if (listener < 0) {
perror("listener");
exit(EXIT_FAILURE);
}
if (setsockopt(listener, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) == -1) {
perror("setsockopt");
exit(EXIT_FAILURE);
}
setNonBlocking(listener);
struct sockaddr_in server_address;
memset((char *) &server_address, 0, sizeof(server_address));
server_address.sin_family = AF_INET;
// server_address.sin_addr.s_addr = htonl(INADDR_ANY);
inet_aton("132.65.151.39",&(server_address.sin_addr));
server_address.sin_port = htons(atoi(port));
if (bind(listener, (struct sockaddr *) &server_address,
sizeof(server_address)) < 0 ) {
perror("bind");
close(listener);
exit(EXIT_FAILURE);
}
listen(listener,BACKLOG);
maxSocket = listener;
memset((char *) &clientQueue, 0, sizeof(clientQueue));
return 0;
}
void readSockets() {
int i;
cout << "in readSockets()" << endl;
if (FD_ISSET(listener,&sockets))
createConnection();
for (i = 0; i < 5; i++) {
if (FD_ISSET(clientQueue[i],&sockets))
readData(i);
} /* for (all entries in queue) */
}
int main(int argc, char* argv[]) {
if (argc != 2) {
fprintf(stderr,"usage: server port\n");
exit(EXIT_FAILURE);
}
if (initialize(argv[1]) != 0) {
exit(EXIT_FAILURE);
}
struct timeval timeout;
int value;
printf("server: waiting for connections...\n");
while(1) { // main accept() loop
build_select_list();
timeout.tv_sec = 1;
timeout.tv_usec = 0;
value = select(maxSocket, &sockets, (fd_set *) 0,(fd_set *) 0, &timeout);
if (value == -1) {
perror("select");
exit(EXIT_FAILURE);
}
if (value == 0) {
printf("%d",value);
fflush(stdout);
} else{
cout << "Value is " << value << endl;
readSockets();
}
}
return EXIT_SUCCESS;
}
My problem is simple - select always returns 0, meaning it does not get or does not respond to a new connection. I checked my client a day ago with a blocking more simple server and it did work, so I don't think its the porblem.
You'll notice that I tried both IP addresses:
server_address.sin_family = AF_INET;
// server_address.sin_addr.s_addr = htonl(INADDR_ANY);
Can anyone please help me? I feel lost :)

Answer 1

Please refer to man select, first parameter should be number of highest descriptor + 1, so in your case:
value = select(maxSocket + 1, &sockets, (fd_set *) 0,(fd_set *) 0, &timeout);