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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