Fix QSocketEngineBackend::nativeBytesAvaible for UDP sockets

On OS X ioctl(... FIONREAD) on UDP socket returns more than expected:

"SO_NREAD returns the amount of data in the input buffer that is available to be received
 For datagram oriented sockets, SO_NREAD returns the size of the first packet -- this dif-
 fers from the ioctl() command FIONREAD that returns the total amount of data available."
(man getsockopt). On OS X bytesAvailable for UDP socket seems to include some headers also:
for a datagram of size 1 - bytesAvailable == 17, 2 - bytesAvailable == 18 etc.
Found in a broken tst_qudpsocket test.

Change-Id: I88be827c66208835ed10b010f13d9dc70576fea4
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

0 files changed, 0 insertions, 0 deletions