linux-kernel - Re: *at syscalls for xattrs?

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Date:	Mon, 16 Jul 2007 11:05:22 +0200
From:	Miklos Szeredi <miklos@...redi.hu>
To:	jeremy@...p.org
CC:	jengelh@...putergmbh.de, viro@....linux.org.uk, nmiell@...cast.net,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: *at syscalls for xattrs?

> > fd1 = open("dir1", O_DIRECTORY):
> > fd2 = open("dir2", O_DIRECTORY);
> > system("mount -t tmpfs none dir1");
> > system("mount -t tmpfs none dir2");
> > openat(fd1, "file1", O_RDWR | O_CREAT);
> > openat(fd2, "file2", O_RDWR | O_CREAT);
> > If you have a better way to accomplish this, let me know. :)
> >   
> 
> This should work:
> 
>     fchdir(fd1);
>     open("file1", O_RDWR | O_CREAT);
>     fchdir(fd2);
>     open("file2", O_RDWR | O_CREAT);

If you only have a single thread, yes.

The *at() thing basically gives you the advantages of a CWD without
the disadvantages.

For example it could be useful to implement the functionality of
find(1) as a library interface.

Miklos
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