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* [TUHS] Happy birthday, Dennis Ritchie!
@ 2017-09-08 20:54 Dave Horsfall
  2017-09-08 21:04 ` Noel Chiappa
                   ` (3 more replies)
  0 siblings, 4 replies; 204+ messages in thread
From: Dave Horsfall @ 2017-09-08 20:54 UTC (permalink / raw)


Sadly no longer with us (he exited in 2011), he was forked in 1941.  Just 
think, if it wasn't for him and Ken, we'd all be running Windoze, and 
thinking it's wonderful.

A Unix bigot through and through, I remain,

-- 
Dave Horsfall DTM (VK2KFU)  "Those who don't understand security will suffer."


^ permalink raw reply	[flat|nested] 204+ messages in thread
* [TUHS] Happy birthday, Dennis Ritchie! [ really sun vs dec/apollo --> X and NeWS ]
@ 2017-09-19 12:24 Norman Wilson
  2017-09-19 18:09 ` Random832
  0 siblings, 1 reply; 204+ messages in thread
From: Norman Wilson @ 2017-09-19 12:24 UTC (permalink / raw)


Random832:

  Just out of curiosity, where does perror(filename), quite possibly the
  *most* common error message on Unix as a whole, fall on your scale? It
  says which of the file location or permissions (or whatever else) it is,
  but not whether it was attempting to open it for reading or writing.

=====

I never liked perror much.  It's a little too primitive:
you get exactly one non-formatted string; you get only
stderr, so if you're sending messages separately to a log
or writing them to a network connection or the like, you're
out of luck.

strerror(errno) hits the sweet spot for me.  Until it
appeared in the standard library (and until said standard
spread enough that one could reasonably expect to find it
anywhere) I kept writing more or less that function into
program after program.

I guess the problem with perror is that it isn't sufficiently
UNIX-like: it bundles three jobs that are really separate
(convert errno to string message, format an error message,
output the message) into one function, inseparably and
inflexibly.

Norman Wilson
Toronto ON


^ permalink raw reply	[flat|nested] 204+ messages in thread
* [TUHS] Happy birthday, Dennis Ritchie! [ really sun vs dec/apollo --> X and NeWS ]
@ 2017-09-21 17:46 Norman Wilson
  0 siblings, 0 replies; 204+ messages in thread
From: Norman Wilson @ 2017-09-21 17:46 UTC (permalink / raw)


On Tue, Sep 19, 2017, at 10:42, Larry McVoy wrote:
> slib.c:1653 (bk-7.3): open failed: permission denied
> 
> which is way way way more useful than just permission denied.

Random832 replied:

  Well. It's less useful in one way - it doesn't say what file it was
  trying to open. You could pass the filename *instead* of "open failed",
  but that still omits the issue I had pointed out: what were you trying
  to open the file for (at the very least, were you trying to read, write,
  or exec it). Ideally the function would have a format and arguments.

====

Exactly.

The string interpretation of errno is just another
item of data that goes in an error message.  There is
no fixed place it belongs, and it doesn't always
belong there, because all that is error does not
fail from a syscall (or library routine).

I do often insert a function of the form

	void errmsg(char *, ...)

in my C programs.  It takes printf-like arguments.
Normally they just get passed to vfprintf(stderr, ...),
though sometimes there is something more esoteric,
and often fprintf(stderr, "%s: ", progname) ends up
in front.

But errmsg never knows anything about errno.  Why
should it?  It's supposed to send complaints to
a standard place; it's not supposed to invent the
complaints for itself!  If an errno is involved,
I write something like
	errmsg("%s: cannot open: %s", filename, strerror(errno));
(Oh, yes, errmsg appends a newline too.  The idea
is to avoid cluttering code with minutiae of how
errors are reported.)

I don't print the source code filename or line number
except for `this shouldn't have happened' errors.
For routine events like the user gave the wrong
filename or it had the wrong permissions or his
data are malformed, pointers to the source code are
just unhelpful clutter, like the complicated
%JARGON-OBSCURE-ABBREVIATION prefixes that accompanied
every official error message in VMS.

Of course, if the user's data are malformed, he
should be told which file has the problem and
where in the file.  But that's different from
telling him that line 193 of some file he doesn't
have and will probably never see contains the system
call that reported that he typed the wrong filename.

Norman Wilson
Toronto ON


^ permalink raw reply	[flat|nested] 204+ messages in thread

end of thread, other threads:[~2017-09-23 22:24 UTC | newest]

Thread overview: 204+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2017-09-08 20:54 [TUHS] Happy birthday, Dennis Ritchie! Dave Horsfall
2017-09-08 21:04 ` Noel Chiappa
2017-09-08 21:09   ` Michael Kjörling
2017-09-09  1:16     ` Wesley Parish
2017-09-09  1:30       ` [TUHS] File-as-record (was: Happy birthday, Dennis Ritchie!) Greg 'groggy' Lehey
2017-09-09  1:43         ` Warner Losh
2017-09-09  1:50         ` Wesley Parish
2017-09-09 13:59           ` [TUHS] File-as-record Arthur Krewat
2017-09-11 17:26         ` [TUHS] File-as-record (was: Happy birthday, Dennis Ritchie!) Paul Winalski
2017-09-09  4:34       ` [TUHS] Happy birthday, Dennis Ritchie! Steve Johnson
2017-09-09 13:04         ` William Cheswick
2017-09-09 17:26           ` Steve Nickolas
2017-09-09 17:49           ` Arthur Krewat
2017-09-09 19:40             ` Steve Nickolas
2017-09-09 20:33           ` Lawrence Stewart
2017-09-09 21:56             ` Steve Johnson
2017-09-10  1:27               ` Dave Horsfall
2017-09-11 16:20             ` Paul Winalski
2017-09-09 15:55         ` Clem Cole
2017-09-08 22:28   ` Steve Nickolas
2017-09-09 11:04     ` Michael Kjörling
2017-09-09 11:19       ` Steve Nickolas
2017-09-08 21:05 ` Arthur Krewat
2017-09-08 21:14 ` William Pechter
2017-09-08 22:13   ` Angus Robinson
2017-09-08 23:11     ` William Pechter
2017-09-09  5:13       ` Dave Horsfall
2017-09-09 15:41         ` Larry McVoy
2017-09-09  4:20   ` Dave Horsfall
2017-09-11 16:30   ` Paul Winalski
2017-09-11 16:49     ` [TUHS] Happy birthday, Dennis Ritchie! [ really sun vs dec/apollo ] Jon Steinhart
2017-09-11 17:37       ` Paul Winalski
2017-09-11 23:09       ` Larry McVoy
2017-09-12  7:38         ` arnold
2017-09-12 14:12           ` Ronald Natalie
2017-09-12 14:51             ` Toby Thain
2017-09-12 15:33             ` arnold
2017-09-12 15:35           ` [TUHS] Happy birthday, Dennis Ritchie! [ really sun vs dec/apollo --> X and NeWS ] Jon Steinhart
2017-09-12 16:57             ` Larry McVoy
2017-09-12 17:04             ` Arthur Krewat
2017-09-12 17:07               ` Larry McVoy
2017-09-12 22:11               ` [TUHS] X and NeWS history (long) Jon Steinhart
2017-09-12 22:58                 ` Larry McVoy
2017-09-12 23:22                   ` Jon Steinhart
2017-09-12 23:44                     ` Chris Torek
2017-09-12 23:41                 ` Adam Sampson
2017-09-13  0:14                   ` Jon Steinhart
2017-09-13 16:38                     ` [TUHS] old X versions (was:X and NeWS history) Christian Groessler
2017-09-13 19:10                       ` Kurt H Maier
2017-09-13 19:13                         ` Henry Bent
2017-09-19  0:44                       ` Random832
2017-09-19 10:30                         ` Nigel Williams
2017-09-19 14:05                           ` Jon Steinhart
2017-09-19 15:16                             ` Gregg Levine
2017-09-19 15:39                               ` [TUHS] old X versions Chet Ramey
2017-09-19 18:23                                 ` Nemo
2017-09-19 18:32                                   ` Clem Cole
2017-09-19 18:32                                   ` Chet Ramey
2017-09-19 18:34                                     ` Jon Steinhart
2017-09-19 18:43                                     ` Chet Ramey
2017-09-19 19:19                                       ` Stephen Kitt
2017-09-19 15:40                               ` [TUHS] old X versions (was:X and NeWS history) Clem Cole
2017-09-19 17:01                               ` Steve Nickolas
2017-09-19 17:15                                 ` Gregg Levine
2017-09-19 18:56                                   ` Derek Fawcus
2017-09-19 19:22                                     ` [TUHS] old X versions Arthur Krewat
2017-09-19 20:15                                     ` [TUHS] old X versions (was:X and NeWS history) Gregg Levine
2017-09-19 18:30                                 ` Nemo
2017-09-19 23:40                               ` Wesley Parish
2017-09-19 23:46                                 ` [TUHS] old X versions Grant Taylor
2017-09-20  0:06                                   ` Arthur Krewat
2017-09-13  0:29                 ` [TUHS] X and NeWS history (long) Bakul Shah
2017-09-13  0:52                   ` ron minnich
2017-09-13  0:54                     ` Warner Losh
2017-09-13  0:56                       ` ron minnich
2017-09-13  0:57                         ` Warner Losh
2017-09-13  2:06                         ` Kurt H Maier
2017-09-13  3:34                           ` ron minnich
2017-09-13  3:55                             ` Jon Steinhart
2017-09-13 15:16                               ` Arthur Krewat
2017-09-13 15:42                                 ` [TUHS] X and NeWS history (long) [ really systemd, student access to real code ] Jon Steinhart
2017-09-13  1:42                     ` [TUHS] X and NeWS history (long) Arthur Krewat
2017-09-13  2:27                       ` Grant Taylor
2017-09-13 16:14                     ` Lawrence Stewart
2017-09-13  0:56                   ` Jon Steinhart
2017-09-13  1:34                     ` Bakul Shah
2017-09-13  2:43                     ` Grant Taylor
2017-09-13  3:01                       ` Jon Steinhart
2017-09-13  3:25                         ` Grant Taylor
2017-09-13  3:27                           ` Jon Steinhart
2017-09-13 15:09                 ` Tony Finch
2017-09-13 15:19                   ` Jon Steinhart
2017-09-12 23:33               ` [TUHS] Happy birthday, Dennis Ritchie! [ really sun vs dec/apollo --> X and NeWS ] Dave Horsfall
2017-09-12 20:15             ` Steve Johnson
2017-09-13  2:23               ` Larry McVoy
2017-09-14  0:53                 ` Nemo
2017-09-14  1:18                   ` Henry Bent
2017-09-14  3:15                   ` Larry McVoy
2017-09-14  9:35                   ` Rico Pajarola
2017-09-14 11:11                     ` arnold
2017-09-14 12:13                       ` Rico Pajarola
2017-09-14 12:50                         ` Chet Ramey
2017-09-14 13:27                           ` Rico Pajarola
2017-09-14 14:30                             ` Chet Ramey
2017-09-14 13:21                       ` Steffen Nurpmeso
2017-09-14 19:44                         ` arnold
2017-09-14 20:22                           ` [TUHS] Tools and building: libtool, autoconf, etc. [ trying to have a relevant subject line ] Jon Steinhart
2017-09-14 20:32                             ` Ron Natalie
2017-09-14 21:00                               ` Chris Torek
2017-09-14 21:03                                 ` Ron Natalie
2017-09-14 22:26                                   ` Grant Taylor
2017-09-16  3:34                                 ` Larry McVoy
2017-09-16  4:16                                   ` Warner Losh
2017-09-16  5:08                                   ` Dave Horsfall
2017-09-16  3:33                               ` Larry McVoy
2017-09-14 20:41                             ` Bakul Shah
2017-09-14 21:00                               ` Noel Hunt
2017-09-15 17:42                           ` [TUHS] Happy birthday, Dennis Ritchie! [ really sun vs dec/apollo --> X and NeWS ] Steffen Nurpmeso
2017-09-14 20:31                         ` Ian Zimmerman
2017-09-15  3:16                   ` Dave Horsfall
2017-09-15  3:33                     ` Warner Losh
2017-09-15  8:32                       ` Ron Natalie
2017-09-15 12:42                     ` Arthur Krewat
2017-09-15 18:20                     ` Steffen Nurpmeso
2017-09-15 18:37                       ` Paul Winalski
2017-09-13  7:30               ` arnold
2017-09-13 13:35                 ` Larry McVoy
2017-09-13 23:55                   ` Dave Horsfall
2017-09-14  0:18                     ` Henry Bent
2017-09-14  2:10                       ` Larry McVoy
2017-09-14 19:37                       ` Steve Johnson
2017-09-14 19:54                         ` Steve Nickolas
2017-09-14 20:50                           ` Ian Zimmerman
2017-09-14 21:00                             ` Ron Natalie
2017-09-14 20:11                         ` Ron Natalie
2017-09-14 20:26                           ` Jon Steinhart
2017-09-19  0:52                         ` Random832
2017-09-19  2:50                           ` Larry McVoy
2017-09-19  2:56                             ` Gregg Levine
2017-09-19  3:37                               ` Larry McVoy
2017-09-19  6:52                                 ` Lars Brinkhoff
2017-09-19  7:22                             ` Ian Zimmerman
2017-09-19 13:22                               ` Larry McVoy
2017-09-19 13:53                             ` Steffen Nurpmeso
2017-09-19 13:56                               ` Larry McVoy
2017-09-19 17:56                                 ` Random832
2017-09-19 18:31                                   ` Steffen Nurpmeso
2017-09-19 18:34                                     ` Larry McVoy
2017-09-19 19:31                                   ` Lawrence Stewart
2017-09-20  3:13                                   ` Larry McVoy
2017-09-23 22:24                                     ` Ralph Corderoy
2017-09-19 14:32                             ` Clem Cole
2017-09-19 14:42                               ` Larry McVoy
2017-09-19 15:12                                 ` Clem Cole
2017-09-19 18:03                                 ` Random832
2017-09-10  9:44 ` [TUHS] Happy birthday, Dennis Ritchie! arnold
2017-09-13 23:22   ` Dave Horsfall
2017-09-14 16:11     ` Ian Zimmerman
2017-09-14 16:15       ` Steve Nickolas
2017-09-14 19:30         ` Theodore Ts'o
2017-09-14 19:52           ` Steve Nickolas
2017-09-14 22:03             ` Christian Groessler
2017-09-14 22:39               ` Erik Berls
2017-09-14 22:52                 ` ron minnich
2017-09-14 23:04                   ` Warner Losh
2017-09-14 23:14                     ` Bakul Shah
2017-09-15 19:01                     ` Chris Torek
2017-09-15 19:50                       ` Lyndon Nerenberg
2017-09-15 19:56                         ` ron minnich
2017-09-15 20:34                         ` Chris Torek
2017-09-14 23:06                   ` Bakul Shah
2017-09-15  0:47                     ` ron minnich
2017-09-14 19:39         ` Kurt H Maier
2017-09-14 20:09           ` [TUHS] Happy birthday, Dennis Ritchie! [ really Pottering vs UNIX ] Jon Steinhart
2017-09-14 21:35           ` [TUHS] Happy birthday, Dennis Ritchie! Theodore Ts'o
2017-09-15  1:40             ` Ron Natalie
2017-09-15 14:04               ` Larry McVoy
2017-09-16  3:40             ` Larry McVoy
2017-09-16  7:45               ` Steve Nickolas
2017-09-16 12:59               ` Ron Natalie
2017-09-16 18:19                 ` Andy Kosela
2017-09-17 18:37                 ` Chet Ramey
2017-09-18 15:11                   ` Steve Johnson
2017-09-16 19:20               ` arnold
2017-09-17  1:43                 ` Larry McVoy
2017-09-17  1:55                   ` Jon Steinhart
2017-09-17  2:14                     ` Warner Losh
2017-09-17  2:18                       ` Larry McVoy
2017-09-17 14:27                         ` Warner Losh
2017-09-17  5:13                     ` Ian Zimmerman
2017-09-17  5:19                   ` arnold
2017-09-17 18:49                     ` Chet Ramey
2017-09-17 18:57                       ` Kurt H Maier
2017-09-17 19:08                         ` Warner Losh
2017-09-17 19:33                           ` Bakul Shah
2017-09-17 19:22                         ` Chet Ramey
2017-09-17 18:43                   ` Chet Ramey
2017-09-18  0:12                     ` Larry McVoy
2017-09-18  0:51                       ` Clem Cole
2017-09-17 18:25               ` Chet Ramey
2017-09-19 12:24 [TUHS] Happy birthday, Dennis Ritchie! [ really sun vs dec/apollo --> X and NeWS ] Norman Wilson
2017-09-19 18:09 ` Random832
2017-09-19 19:21   ` Chris Torek
2017-09-21 17:46 Norman Wilson

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