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Date: Thu, 12 Jan 2017 11:06:52 -0800
From: "L. A. Walsh" <cygwin AT tlinx DOT org>
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To: cygwin AT cygwin DOT com
Subject: Re: rename() cannot replace the file which is opened with writable access
References: <20170112 DOT 090746 DOT 2056666314950620331 DOT trueroad AT trueroad DOT jp>
In-Reply-To: <20170112.090746.2056666314950620331.trueroad@trueroad.jp>
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Masamichi Hosoda wrote:
> Hello,
>
> I've found that rename() cannot replace the file
> which is opened with writable access on Cygwin.
> On Linux, it works.
>
> If I understand correctly, it should work under POSIX.
>
> Here's sample code for reproduce.
---
> #define OLDPATH "oldpath"
> #define NEWPATH "newpath"
>
> int main () {
>   int fd;
>   struct flock fl;
>   char buff[] = "test";
>   fd = open (OLDPATH, O_CREAT | O_RDWR | O_TRUNC, 0666);
>   close (fd);
>   fd = open (NEWPATH, O_CREAT | O_RDWR | O_TRUNC, 0666);
>   if (rename (OLDPATH, NEWPATH) < 0)  perror ("rename");
>   
----
    What are you trying to do by renaming the oldfile
over the top of a still-open-for-write, "newfile".

    Why rename over the top of another file?  What are you trying
to do?  Maybe there is a better way to do it?  ;-). 

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