DragonFly BSD
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Re: cvs commit: src/sys/kern vfs_syscalls.c

From: Xin LI <delphij@xxxxxxxxxxxxx>
Date: Mon, 15 Aug 2005 18:10:08 +0800

在 2005-08-15一的 00:26 -0700,Matthew Dillon写道:
> dillon      2005/08/15 00:26:47 PDT
> DragonFly src repository
>   Modified files:
>     sys/kern             vfs_syscalls.c 
>   Log:
>   UFS sometimes reports: 'ufs_rename: fvp == tvp (can't happen)'.  The case
>   is not supposed to be able to happen, and UFS ignores the rename operation
>   when it sees it.   This is true in both FreeBSD and DragonFly.
>   But, in fact, the case CAN happen if you rename a file to another that
>   happens to be a hardlink to the first.  The rename operations appears to

The FreeBSD behavior was intentional.  I think this change violates
POSIX, which states:

"If the old argument and the new argument resolve to the same existing
file, rename() shall return successfully and perform no other action."

(See http://www.opengroup.org/onlinepubs/009695399/functions/rename.html
for reference.  This could be found from the third paragraph of the

I am not sure why POSIX requires this feature, though :-)  What do you
think about it?

Xin LI <delphij delphij net>  http://www.delphij.net/

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