lkml.org 
[lkml]   [2005]   [Dec]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
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 ❖
-
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/

\
 
 \ /
  Last update: 2005-12-16 17:29    [from the cache]
©2003-2011 Jasper Spaans