public void mkdir(String dirName, int posixPermissions) throws IOException
{
int req_id = generateNextRequestID();
TypesWriter tw = new TypesWriter();
tw.writeString(dirName, charsetName);
tw.writeUINT32(AttribFlags.SSH_FILEXFER_ATTR_PERMISSIONS);
tw.writeUINT32(posixPermissions);
sendMessage(Packet.SSH_FXP_MKDIR, req_id, tw.getBytes());