this closes ticket #811.
* Added notification support to IPv4 and UDP.
* Implemented reading out SO_ERROR.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@19017 a95241bf-73f2-0310-859d-f6bbb57e9c96
* socket_listen() now sets the SO_ACCEPTCONN flag if it succeeds.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@18476 a95241bf-73f2-0310-859d-f6bbb57e9c96