Function gnunet_sys::GNUNET_NETWORK_socket_recvfrom_amount

pub unsafe extern "C" fn GNUNET_NETWORK_socket_recvfrom_amount(
    desc: *const GNUNET_NETWORK_Handle
) -> isize

How much data is available to be read on this descriptor?

@param desc socket @returns #GNUNET_SYSERR if no data is available, or on error!