* [9fans] renaming to an existing file
@ 2009-08-05 1:25 Roman V Shaposhnik
2009-08-05 1:41 ` Russ Cox
0 siblings, 1 reply; 2+ messages in thread
From: Roman V Shaposhnik @ 2009-08-05 1:25 UTC (permalink / raw)
To: Fans of the OS Plan 9 from Bell Labs
I've just realized that in 9P the wstat would refuse
to rename an entry if a target name already exists.
So how can I atomically replace one file with another
one, so that during the operation clients opening
it would not fail?
In POSIX rename gives you such an atomicity:
-----------------------------------------------------------------------
If the old argument points to the pathname of a file that is not a
directory, the new argument shall not point to the pathname of a
directory. If the link named by the new argument exists, it shall be
removed and old renamed to new. In this case, a link named new shall
remain visible to other processes throughout the renaming operation and
refer either to the file referred to by new or old before the operation
began.
------------------------------------------------------------------------
How can I achieve the same result with 9P?
Thanks,
Roman.
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [9fans] renaming to an existing file
2009-08-05 1:25 [9fans] renaming to an existing file Roman V Shaposhnik
@ 2009-08-05 1:41 ` Russ Cox
0 siblings, 0 replies; 2+ messages in thread
From: Russ Cox @ 2009-08-05 1:41 UTC (permalink / raw)
To: Fans of the OS Plan 9 from Bell Labs
> How can I achieve the same result with 9P?
You can't. (Redefine 9P.)
Russ
^ permalink raw reply [flat|nested] 2+ messages in thread
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