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Date: Wed, 08 Mar 2006 22:36:35 +0000
From: Max Bowsher <maxb1 AT ukf DOT net>
Reply-To: cygwin AT cygwin DOT com
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To: cygwin AT cygwin DOT com
Subject: [BUG] rename("symlink", "regular_file") has weird results
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Suppose "foo.tmp" is a symlink, and "foo" is a regular file.

Calling rename("foo.tmp", "foo") results in the very bizarre situation
where, as far as Cygwin is concerned, there are TWO files called "foo"
within the same directory.

Below is a small C program to reproduce this state of affairs.

Max.

=====================================================================

#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>

#define M1BAD(x) if ((x) == -1) { handle_error(#x); }
#define ZOK(x) if ((x) != 0) { handle_error(#x); }
static void handle_error(char *op)
{
    fprintf(stderr, "E: %s: %s\n", op, strerror(errno));
    exit(1);
}

int main(void)
{
  int fd;

  M1BAD(fd = open("foo", O_CREAT, 0644));
  ZOK(close(fd));

  ZOK(symlink("nonexistent", "foo.tmp"));

  ZOK(rename("foo.tmp", "foo"));

  return 0;
}

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