From: chet.ramey@case.edu (Chet Ramey)
Subject: [TUHS] UNIX of choice these days?
Date: Tue, 26 Sep 2017 11:17:54 -0400 [thread overview]
Message-ID: <5036e22a-c2ef-68b0-0a65-e722804566b4@case.edu> (raw)
In-Reply-To: <20170926145326.GX28606@mcvoy.com>
On 9/26/17 10:53 AM, Larry McVoy wrote:
> On Mon, Sep 25, 2017 at 10:06:55PM -0400, Chet Ramey wrote:
>> On 9/25/17 7:49 PM, Dave Horsfall wrote:
>>> On Mon, 25 Sep 2017, Larry McVoy wrote:
>>>
>>>> ????????lrwx------ 1 lm lm 64 Sep 23 21:39 255 -> /dev/pts/8
>>>
>>> What the heck is file descriptor 255?
>>
>> It appears to be a file descriptor open to his controlling terminal.
>
> LOL. I think he's wondering why the fd has the value of 255 and I dunno.
> Some weird bash thing?
It's not weird. Bash keeps a file descriptor open to the controlling
terminal to use for job control and other terminal operations. After it
opens the ctty, it dups the file descriptor to something out of the usual
range people use to save and restore fds. It uses the RLIMIT_NOFILE
resource limit to determine the upper bound, but doesn't go past 256 (some
systems set that limit pretty high). So you have a file descriptor that the
shell can use but is close-on-exec and unusual enough to avoid being
stepped on.
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU chet at case.edu http://cnswww.cns.cwru.edu/~chet/
next prev parent reply other threads:[~2017-09-26 15:17 UTC|newest]
Thread overview: 110+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-25 12:07 Norman Wilson
2017-09-25 14:16 ` Clem Cole
2017-09-25 15:13 ` Warner Losh
2017-09-25 16:51 ` Warner Losh
2017-09-26 0:56 ` ron minnich
2017-09-25 15:18 ` Larry McVoy
2017-09-25 15:30 ` Warner Losh
2017-09-25 23:49 ` Dave Horsfall
2017-09-26 2:06 ` Chet Ramey
2017-09-26 14:53 ` Larry McVoy
2017-09-26 15:17 ` Chet Ramey [this message]
2017-09-26 21:23 ` Dave Horsfall
2017-09-26 21:43 ` Arthur Krewat
2017-09-26 21:45 ` Grant Taylor
2017-09-27 0:58 ` Dave Horsfall
2017-09-27 1:37 ` Chet Ramey
2017-09-27 2:02 ` Larry McVoy
2017-09-27 13:50 ` Chet Ramey
2017-09-27 14:17 ` Larry McVoy
2017-09-28 8:10 ` Derek Fawcus
2017-09-28 12:34 ` Chet Ramey
[not found] ` <20170928174420.GA41732@accordion.employees.org>
2017-09-28 17:57 ` Derek Fawcus
2017-09-28 18:04 ` Chet Ramey
2017-09-27 3:42 ` Dave Horsfall
2017-09-27 14:35 ` Chet Ramey
-- strict thread matches above, loose matches on Subject: below --
2017-09-30 15:17 Norman Wilson
2017-09-30 20:29 ` Kevin Bowling
2017-09-30 21:56 ` Bakul Shah
2017-09-30 22:37 ` Kevin Bowling
2017-09-25 12:46 [TUHS] Unix " Doug McIlroy
2017-09-25 13:57 ` Clem Cole
2017-09-23 23:39 [TUHS] UNIX " Nelson H. F. Beebe
2017-09-21 2:28 Rudi Blom
2017-09-20 0:12 Arthur Krewat
2017-09-20 0:26 ` Larry McVoy
2017-09-20 0:39 ` Dave Horsfall
2017-09-20 1:03 ` Lyndon Nerenberg
2017-09-20 20:56 ` jason-tuhs
2017-09-23 9:17 ` Dario Niedermann
2017-09-23 9:36 ` Steve Mynott
2017-09-23 10:03 ` Dario Niedermann
2017-09-23 23:04 ` Dave Horsfall
2017-09-24 0:11 ` Random832
2017-09-24 1:19 ` Dave Horsfall
2017-09-24 13:46 ` Andy Kosela
2017-09-24 14:02 ` ron minnich
2017-09-24 14:06 ` Larry McVoy
2017-09-24 20:36 ` Kurt H Maier
2017-09-24 21:38 ` Bakul Shah
2017-09-24 23:36 ` Dave Horsfall
2017-09-24 23:50 ` Steve Nickolas
2017-09-25 0:03 ` Wesley Parish
2017-09-25 15:36 ` Tony Finch
2017-09-26 0:42 ` Wesley Parish
2017-09-26 9:54 ` Tony Finch
2017-09-26 14:41 ` Larry McVoy
2017-09-26 17:34 ` Bakul Shah
2017-09-26 17:39 ` Warner Losh
2017-09-26 18:26 ` Bakul Shah
2017-09-26 17:43 ` Larry McVoy
2017-09-26 19:44 ` Grant Taylor
2017-09-26 23:22 ` Wesley Parish
2017-09-25 0:51 ` Charles Anthony
2017-09-25 0:36 ` Dan Cross
2017-09-25 0:44 ` Grant Taylor
2017-09-25 0:56 ` Bakul Shah
2017-09-25 15:45 ` Tony Finch
2017-09-25 16:14 ` Bakul Shah
2017-09-25 7:41 ` Andy Kosela
2017-09-25 7:43 ` Cory Smelosky
2017-09-25 10:14 ` Andy Kosela
2017-09-25 9:58 ` Steve Nickolas
2017-09-25 11:14 ` Derek Fawcus
2017-09-25 11:48 ` Andrew Warkentin
2017-09-24 15:26 ` Christian Barthel
2017-09-24 17:33 ` Clem Cole
2017-09-24 17:33 ` Clem Cole
2017-09-23 23:00 ` Dave Horsfall
2017-09-26 22:00 ` Christian Groessler
2017-09-20 4:42 ` Grant Taylor
2017-09-20 8:31 ` Mutiny
2017-09-20 9:15 ` Steve Nickolas
2017-09-20 16:58 ` Arthur Krewat
2017-09-20 17:05 ` Steve Nickolas
2017-09-20 17:53 ` Henry Bent
2017-09-20 18:12 ` Arthur Krewat
2017-09-20 18:33 ` Brad Spencer
2017-09-20 19:20 ` Henry Bent
2017-09-20 19:37 ` Arthur Krewat
2017-09-20 19:58 ` Jacob Ritorto
2017-09-20 22:29 ` Ian Zimmerman
2017-09-20 22:31 ` Warner Losh
2017-09-20 12:52 ` Chet Ramey
2017-09-20 13:33 ` Nemo
2017-09-20 15:39 ` Clem Cole
2017-09-20 15:42 ` Jon Steinhart
2017-09-20 16:58 ` Ian Zimmerman
2017-09-20 17:09 ` Jon Steinhart
2017-09-20 17:31 ` Arthur Krewat
2017-09-20 22:40 ` Steve Simon
2017-09-20 22:51 ` Erik Berls
2017-09-20 23:37 ` Robert Brockway
2017-09-21 1:47 ` Derrik Walker v2.0
2017-09-21 3:54 ` Gregg Levine
2017-09-21 14:33 ` Nicholas Chappell
2017-09-21 16:38 ` Mutiny
2017-09-21 16:42 ` gilbertmm
2017-09-21 18:30 ` Grant Taylor
2017-09-21 23:34 ` Dave Horsfall
2017-09-25 10:36 ` Thomas Kellar
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