Messages in this thread | | | From | Kyle Moffett <> | Subject | Re: [RFC/PATCH] revokeat/frevoke system calls V5 | Date | Mon, 26 Feb 2007 16:36:05 -0500 |
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On Feb 26, 2007, at 13:46:21, H. Peter Anvin wrote: > Alan wrote: >>> I'm not sure. Turning, for example, the statat(dir_fd, name == >>> NULL) error case into fstat(dir_fd) sounds like a way for apps, >>> admittedly buggy ones, to be surprised. Maybe libc would be >>> exptected to catch the error before performing the shared system >>> call? >> At that point would it not be cheaper to have two system calls, >> the table cost isn't very large. > > It's not just the table, though, you need two entry points, but > even that isn't really all that big either, I guess.
Well, I suppose there are multiple possibilities for consolidation: frevokeat(fd, "/foo/bar/baz") => normal frevokeat frevokeat(-1, "/foo/bar/baz") => revoke("/foo/bar/baz"); frevokeat(fd, NULL) => frevoke(fd);
Neither of those would ordinarily be considered to do anything useful and for new syscalls I can't see the possibility of breaking existing programs. On the other hand, it's not like we have any problems with the syscall tables getting too large.
Cheers, Kyle Moffett
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