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    Upvotes15Top Answeranswered Aug 8, 2011 at 9:18

    It's happening very quickly, that's why you don't see anything. What you're doing:

    • ioctl: Is there data for me ? No, nothing yet

    • recv: Block until there is data for me. Some (short) time later: Here is your data

    So if you really want to see FIONREAD, just wait for it.

    /* Try FIONREAD until we get *something* or ioctl fails. */
    while (!bytesAv && ioctl (m_Socket,FIONREAD,&bytesAv) >= 0)
    sleep(1);
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  1. ioctl() - 装置の制御 - IBM

  2. Winsock IOCTL (Winsock2.h) - Win32 apps | Microsoft Learn

  3. What does FIONREAD of UDP (datagram) sockets return?

  4. ioctl_tty(2) - Linux manual page

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    It is platform-dependent. On some platforms, FIONREAD on a UDP socket returns the size of the first datagram. On others it returns the total number of bytes that can be read without blocking, which is the total number of bytes presently in the socket receive buffer.
    FIONREAD (SIOCINQ) Gets a pointer to an integer as argument. Returns the size of the next pending datagram in the integer in bytes, or 0 when no datagram is pending. Warning: Using FIONREAD, it is impossible to distinguish the case where no datagram is pending from the case where the next pending datagram contains zero bytes of data.
    On some platforms, FIONREAD on a UDP socket returns the size of the first datagram. On others it returns the total number of bytes that can be read without blocking, which is the total number of bytes presently in the socket receive buffer. See here for further information.
  7. ioctl(2) - Linux manual page

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