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    SubjectRe: [PATCH 0/3] *at syscalls: Intro
    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 ❖
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