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X-HELO: msa03b.plala.or.jp
Date: Thu, 12 Jan 2017 09:07:46 +0900 (JST)
Message-Id: <20170112.090746.2056666314950620331.trueroad@trueroad.jp>
To: cygwin AT cygwin DOT com
Cc: trueroad AT trueroad DOT jp
Subject: rename() cannot replace the file which is opened with writable access
From: Masamichi Hosoda <trueroad AT trueroad DOT jp>
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X-VirusScan: Outbound; msa03m; Thu, 12 Jan 2017 09:07:48 +0900

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.

```
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>

#define OLDPATH "oldpath"
#define NEWPATH "newpath"

int main ()
{
  int fd;
  struct flock fl;
  char buff[] = "test";

  /* create oldpath file */
  fd = open (OLDPATH, O_CREAT | O_RDWR | O_TRUNC, 0666);
  close (fd);

  /* create newpath file */
  fd = open (NEWPATH, O_CREAT | O_RDWR | O_TRUNC, 0666);

  /* rename *** FAILED on Cygwin *** */
  if (rename (OLDPATH, NEWPATH) < 0)
    perror ("rename");

  close (fd);

  return 0;
}
```

Thanks

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