From: Dan Cross <crossd@gmail.com>
To: Douglas McIlroy <douglas.mcilroy@dartmouth.edu>
Cc: TUHS main list <tuhs@minnie.tuhs.org>
Subject: Re: [TUHS] moving directories in svr2
Date: Wed, 29 Dec 2021 15:15:48 -0500 [thread overview]
Message-ID: <CAEoi9W7EGSnf_UmSNTPF3Qq9gDbOKmrLm-k-RjiJz7+OOgQA-g@mail.gmail.com> (raw)
In-Reply-To: <CAEoi9W4OgF1wKwdeRVB_-0tWQsHTt+J5H3-yTVPDAyphUCkAqA@mail.gmail.com>
On Wed, Dec 29, 2021 at 2:37 PM Dan Cross <crossd@gmail.com> wrote:
> The 4.3BSD man page has this gem: "Hard links may not refer to
> directories (unless the proper incantations are supplied) and may not
> span file systems." And indeed, a quick look at /usr/src/bin/ln.c on a
> VAX running 4.3 shows that it has an undocumented `-f` flag:
> presumably the "proper incantation" mentioned in the man page.
On a lark, I decided to check for this on 7th Edition as well. The man
page says, quite clearly: "It is forbidden to link to a directory or
to link across file systems." However, /usr/src/cmd/ln.c has the
undocumented `-f` flag, and if given, will elide checking for whether
the "name1" argument is a directory or not. Looking at the kernel, as
Doug mentioned, one must be the superuser to link a directory.
- Dan C.
next prev parent reply other threads:[~2021-12-29 20:16 UTC|newest]
Thread overview: 71+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-29 19:13 Douglas McIlroy
2021-12-29 19:37 ` Dan Cross
2021-12-29 20:15 ` Dan Cross [this message]
2021-12-29 20:42 ` Richard Salz
2021-12-29 20:58 ` Dan Cross
2021-12-29 21:20 ` Clem Cole
2021-12-30 3:15 ` Bakul Shah
-- strict thread matches above, loose matches on Subject: below --
2021-12-30 3:45 Noel Chiappa
2021-12-30 4:02 ` Bakul Shah
2021-12-30 16:40 ` Theodore Ts'o
2021-12-30 22:31 ` Dan Cross
2021-12-31 0:43 ` Bakul Shah
2021-12-31 1:00 ` Rob Pike
2021-12-31 1:45 ` Bakul Shah
2021-12-31 2:23 ` Adam Thornton
2021-12-31 18:56 ` Chet Ramey
2021-12-31 3:08 ` Theodore Ts'o
2021-12-31 3:23 ` Rob Pike
2021-12-31 5:16 ` Theodore Ts'o
2021-12-31 5:21 ` Dan Cross
2021-12-31 5:55 ` Rob Pike
2021-12-31 13:32 ` Michael Kjörling
2021-12-31 15:53 ` Adam Thornton
2021-12-31 16:13 ` Arthur Krewat
2021-12-31 18:17 ` Dan Cross
2021-12-31 18:23 ` Larry McVoy
2021-12-31 18:37 ` Dan Cross
2021-12-31 18:29 ` Arthur Krewat
2022-01-01 0:09 ` Theodore Ts'o
2022-01-03 13:35 ` Dan Cross
2022-01-03 20:23 ` Theodore Ts'o
2022-01-03 20:45 ` Warner Losh
2022-01-03 21:15 ` Dan Cross
2022-01-03 22:26 ` Theodore Ts'o
2022-01-03 23:10 ` Dan Cross
2022-01-04 15:45 ` Chet Ramey
2022-01-09 19:28 ` Larry McVoy
2022-01-03 23:21 ` Doug McIntyre
2022-01-03 23:37 ` Adam Thornton
2022-01-04 14:49 ` Stuart Remphrey
2022-01-03 23:44 ` Larry McVoy
2022-01-03 23:56 ` Warner Losh
2022-01-04 2:28 ` Theodore Ts'o
2022-01-04 2:42 ` Larry McVoy
2022-01-03 22:57 ` Phil Budne
2021-12-31 5:12 ` Bakul Shah
2021-12-29 19:33 Noel Chiappa
2021-12-30 3:40 ` Jay Logue via TUHS
2021-12-29 17:12 Douglas McIlroy
2021-12-29 16:59 Bakul Shah
2021-12-29 17:04 ` Clem Cole
2021-12-29 17:14 ` arnold
2021-12-29 17:38 ` Clem Cole
2021-12-29 17:49 ` Brantley Coile
2021-12-29 18:27 ` ron minnich
2021-12-29 20:59 ` Rob Pike
2021-12-29 14:33 Will Senn
2021-12-29 15:02 ` arnold
2021-12-29 15:38 ` Will Senn
2021-12-29 15:44 ` Richard Salz
2021-12-29 16:17 ` Clem Cole
2021-12-29 16:58 ` Richard Salz
2021-12-30 5:14 ` Dan Stromberg
2021-12-30 16:22 ` Clem Cole
2021-12-30 18:02 ` John Cowan
2021-12-30 23:04 ` Richard Salz
2021-12-29 15:17 ` Clem Cole
2021-12-29 15:44 ` Will Senn
2021-12-29 16:10 ` Clem Cole
2021-12-29 16:33 ` Warner Losh
2021-12-29 16:01 ` Bakul Shah
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