Re: [RFC] "Text file busy" when overwriting libraries

Linus Torvalds
2001-10-15T02:06:58Z

On Mon, 15 Oct 2001, Alan Cox wrote:
>
> > We already can open an exec only file just open("file", 0).
>
> Wrong.

For exact details: there's a magic value, but it's 3.

open("file", 3)

will open the filename with neither read nor write permissions, but it
will actually _require_ both read- and write- permissions, and it was
historically a way to open a device just for ioctl's.

I don't think anybody actually uses it any more.

Linus