Introduce signed sizeof() shorthand.

git-svn-id: svn://daper.net/moc/trunk@2730 910807d9-36e0-0310-a014-e9ea483e2ba4
Align MOC with send(2)/recv(2) result type (ssize_t).

git-svn-id: svn://daper.net/moc/trunk@2731 910807d9-36e0-0310-a014-e9ea483e2ba4