/**
* Opens a server TCP connection to clients. Creates, binds, and listens
*
* @param port local TCP port to listen on
* @param backlog listen backlog.
* @return a native handle to the network connection.
* @throws IOException
*/
public int openServer(int port, int backlog) throws IOException {
int fd = -1;
fd = Socket.INSTANCE.socket(Socket.AF_INET, Socket.SOCK_STREAM, 0);
if (fd < 0) {
throw newError(fd, "socket create");
}
set_blocking_flags(fd, /*is_blocking*/ false);
IntByReference option_val = new IntByReference(1);
if (sockets.setsockopt(fd, Socket.SOL_SOCKET, Socket.SO_REUSEADDR, option_val, 4) < 0) {
throw newError(fd, "setSockOpt");
}
option_val.free();
Socket.sockaddr_in local_sin = new Socket.sockaddr_in();
local_sin.sin_family = Socket.AF_INET;
local_sin.sin_port = Inet.htons((short) port);
local_sin.sin_addr = Socket.INADDR_ANY;
if (sockets.bind(fd, local_sin) < 0) {
throw newError(fd, "bind");
}
if (sockets.listen(fd, backlog) < 0) {
throw newError(fd, "listen");
}
return fd;
}
/**
* set a socket option
*
* @param socket socket descriptor
* @param option_name
* @param option_value new value
* @throws IOException on error
*/
public void setSockOpt(int socket, int option_name, int option_value) throws IOException {
IntByReference value = new IntByReference(option_value);
int err = sockets.setsockopt(socket, Socket.SOL_SOCKET, option_name, value, 4);
value.free();
LibCUtil.errCheckNeg(err);
}