Re: rm-ing files with open file descriptors

[Miquel van Smoorenburg]

In article <[e-mail]>,
Richard B. Johnson <[e-mail]> wrote:
>This is a characteristic of a VFS (Virtual File System) on any
>Unix system. The file doesn't go away until it is closed by
>everybody that accesses it. However, you can remove or rename it
>even when it's open for write by other tasks. If a task has an
>open file-descriptor and keeps it open, it could 'fix' a possibly
>deleted file, by opening it again with
>
>         new_fd = open("filename", O_CREAT|O_RDWR, 0644);
>
>(without O_TRUNC) and it will remain in existance after all
>file descriptors are closed, because it was "created" again
>after it was deleted by another task.

Well no. new_fd will refer to a completely new, empty file
which has no relation to the old file at all.

There is no way to recreate a file with a nlink count of 0,
well that is until someone adds flink(fd, newpath) to the kernel.

You're a regular on this list, frankly I'm amazed that you
don't know this ?

Mike.