Messages in this thread | | | Date | Fri, 16 Dec 2005 08:24:53 -0800 | From | Ulrich Drepper <> | Subject | Re: [PATCH 0/3] *at syscalls: Intro |
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Jim Meyering wrote: > FYI, the rm in coreutils-cvs is finally thread-safe and race-free, > when using openat et al.
Actually, Jim, I doubt it. There is one more race which cannot be solved with the existing interfaces. I want to tackle this next, after these changes are decided on.
The problem is directory creation and then populating it. As in cp -r and any backup tool. You currently have to use (at best)
mkdirat(fd, "some-dir", 0666); dfd = openat(fd, "some-dir", O_RDONLY);
What is needed is a way to create a new directory and return a file descriptor for it.
I was thinking about using
dfd = openat(fd, "some-dir", O_RDONLY|O_DIRECTORY|O_CREAT, S_IFDIR|0666)
where the combination of using O_DIRECTORY, O_RDONLY, O_CREAT, and the S_IFDIR flag can be recognized. This is a configuration which cannot be used successfully in current code. Should probably also work with open().
-- ➧ Ulrich Drepper ➧ Red Hat, Inc. ➧ 444 Castro St ➧ Mountain View, CA ❖ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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