I think setgid() will set real to the _saved_ GID, but not the _effective_ GID. Try setregid() and see if it behaves any better. Print its status, and the errno from exec.
Bruce
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Pixar Animation Studios: Reality is not our business.
Pixar's "Toy Story" $184,849,036 domestic, $117.5M overseas and counting.
That makes it number 21 in box office figures of all films ever released.
