Function sf::IpAddress::getLocalAddress() on MacOS

[Laurent]

You should also zero the whole structure in the Windows implementation, for consistency.

I just tested using port 9 on Windows 8 and it works.

[binary1248]

I just checked again, and the reason why this method is possible on Linux (and probably other Unix's & OS X) is because you don't bind a port < 1024. If you just try to connect a socket (TCP or UDP) to local host, it bypasses all port checks because the source port will be in the ephemeral range. This is why you can request a web page from the local host (running on port 80) without your browser requiring any extra privileges.

I don't know how you came to the conclusion that low port numbers don't work on OS X, but it can't have been a permission issue. Port 0 is probably invalid because of its special status.

[Hiura]

You should also zero the whole structure in the Windows implementation, for consistency.

I just tested using port 9 on Windows 8 and it works.

Indeed. Will do.

I don't know how you came to the conclusion that low port numbers don't work on OS X, but it can't have been a permission issue. Port 0 is probably invalid because of its special status.

I've found this SO where James says «Only root has privileges for ports below 1024». He doesn't give any reference, though. However, this seems to be true: I use MAMP to run a local Apache server on my machine. When I set Apache to use port 80 I need to give my credentials. But with a port like 8888 I don't need. It's not a proof but still.