On Mon, Dec 21, 2015 at 08:16:28PM +0100, FRIGN wrote: > On Mon, 21 Dec 2015 19:05:17 +0000 > Dimitris Papastamos <s...@2f30.org> wrote: > > > uid_t, gid_t are typically unsigned, so the check needs to be > > == -1 otherwise it will never be true. > > We both are wrong :P It can either be signed or unsigned.
The only guarantee is that -1 is an invalid uid/gid. That's true regardless of whether it is interpreted as signed or unsigned. The new check works with both signed and unsigned uid/gid. The check < 0 does not work for unsigned uid/gid.
