On Tue, 6 Aug 2019, Lyndon Nerenberg wrote:
Just to extend
this thread a bit more, when did the set[ug]id bit start
getting turned off if the file was overwritten?
I'm pretty sure that's been the case since the dawn of time.
Hmmm... I have this vague memory of V5 (which I only used for a couple of
months before we got V6) not clearing that bit, but after all these years
my memory is starting to fail me :-(
It was certainly the case in every System V (release 0
and beyond) I
worked with, along with many BSDs derivatives (SunOS 3+, Ultrix, etc).
(And Xenix, which had it's own insanity that I now think selinux is
trying to inflict on me.)
I've always thought that Xenix was insane to start with... Then again, my
first experience with it was on a 286... Now, when porting Unify, should
I use large memory model here or small memory model? Crazy.
This has been documented in chown(2) for as long as I
can remember, so
that's a good place to start if you want to dig back through the various
I don't have access to the sources right now, but I'll take your word for
it; it was just a passing thought.