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int SocketIsready(int fd)
{
    int rc;
    fd_set fds;
    struct timeval tv;

    FD_ZERO(&fds);
    FD_SET(fd,&fds);
    tv.tv_sec = tv.tv_usec = 0;

    rc = select(fd+1, &fds, NULL, NULL, &tv);
    if (rc < 0)
      return -1;

    return FD_ISSET(fd,&fds) ? 1 : 0;
}