rename() cannot replace the file which is opened with writable access

[L. A. Walsh]

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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