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Postings from February 2011
On Thu, Feb 3, 2011 at 2:56 PM, Tom Christiansen <tchrist@perl.com> wrote: > Looking at manpages on a couple of BSD systems (OpenBsd and Darwin), > Solaris, and Linux, it begins to look like there may be some convergence > at least amongst those three/four. I include the three relevant manpage > sections from those respective systems below by signature. There is consensus on what to do «If the process has appropriate privileges»: change all IDs. Other than superuser status there isn't consensus on when a process has those privileges (check freebsd for an implementation that disagrees even more than the ones you've listed). Also the BSD's don't seem to conform to the unpriviliged case. setuid makes sense if you have (root) privileges and want to permanently revoke them (you can't do that with $< or $> because neither will set the saved user ID on OSes that support that). If you want a temporary suspension of your permissions seteuid (in other words, $>) is what you want 98% of the time, if only because its semantics are much better defined. Swapping effective and real user IDs (setreuid) makes sense only if your OS is too ancient to support saved IDs. Same logic applies to setgid & friends. LeonThread Previous | Thread Next