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Subject: bug#30928: no error val returned by 'nice' failure?
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I executed a command:
nice --19 sleep 5
and hoped to get back a status as to whether or not I was
allowed to use a negative priority, since on Windows,
anyone in the Admin group can set a priority, with
the above command running sleep at 'High' priority, but
on linux:
> nice --19 sleep 1
nice --19 sleep 1
nice: cannot set niceness: Permission denied
> echo $?
0
nice has an error setting the priority, but doesn't
set any status in the return code.
Shouldn't nice's exit value be something like
EPERM if it couldn't set the priority -- whether or
not it executed the command...
Otherwise, how do you tell if the resetting of the
priority worked or failed?
Content-Disposition: inline Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Mailer: MIME-tools 5.505 (Entity 5.505) Content-Type: text/plain; charset=utf-8 X-Loop: help-debbugs@HIDDEN From: help-debbugs@HIDDEN (GNU bug Tracking System) To: L A Walsh <coreutils@HIDDEN> Subject: bug#30928: Acknowledgement (no error val returned by 'nice' failure?) Message-ID: <handler.30928.B.152192094229890.ack <at> debbugs.gnu.org> References: <5AB6A8E6.2090606@HIDDEN> X-Gnu-PR-Message: ack 30928 X-Gnu-PR-Package: coreutils Reply-To: 30928 <at> debbugs.gnu.org Date: Sat, 24 Mar 2018 19:50:02 +0000 Thank you for filing a new bug report with debbugs.gnu.org. This is an automatically generated reply to let you know your message has been received. Your message is being forwarded to the package maintainers and other interested parties for their attention; they will reply in due course. Your message has been sent to the package maintainer(s): bug-coreutils@HIDDEN If you wish to submit further information on this problem, please send it to 30928 <at> debbugs.gnu.org. Please do not send mail to help-debbugs@HIDDEN unless you wish to report a problem with the Bug-tracking system. --=20 30928: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D30928 GNU Bug Tracking System Contact help-debbugs@HIDDEN with problems
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Subject: bug#30928: no error val returned by 'nice' failure?
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L A Walsh wrote:
> how do you tell if the resetting of the
> priority worked or failed?
I guess you're supposed to look at stderr, which is what you did.
This is the way 'nice' has behaved for quite some time, and it's what POSIX
specifies. We'd need a real good reason to change it, given that changing it
would no doubt break stuff.
X-Loop: help-debbugs@HIDDEN
Subject: bug#30928: no error val returned by 'nice' failure?
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On 03/24/2018 10:09 PM, Paul Eggert wrote:
> L A Walsh wrote:
>> how do you tell if the resetting of the
>> priority worked or failed?
>
> I guess you're supposed to look at stderr, which is what you did.
>
> This is the way 'nice' has behaved for quite some time, and it's what POSIX
> specifies. We'd need a real good reason to change it, given that changing it
> would no doubt break stuff.
Anyway, it wouldn't harm to document this behavior in the Texinfo
manual... the sentence from the POSIX spec sounds quote good:
http://pubs.opengroup.org/onlinepubs/9699919799/utilities/nice.html
If the user lacks appropriate privileges to affect the nice value
in the requested manner, the nice utility shall not affect the
nice value; in this case, a warning message may be written to
standard error, but this shall not prevent the invocation of
/utility/ or affect the exit status.
Have a nice day,
Berny
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Subject: bug#30928: no error val returned by 'nice' failure?
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Paul Eggert wrote:
> L A Walsh wrote:
>> how do you tell if the resetting of the
>> priority worked or failed?
>
> I guess you're supposed to look at stderr, which is what you did.
>
> This is the way 'nice' has behaved for quite some time, and it's what POSIX
> specifies. We'd need a real good reason to change it, given that changing it
> would no doubt break stuff.
---
How about a flag, like -e for 'fail on failure to change priority' and
(maybe less important or useful) '-w' to only return nice's return
value, with the posix error message returned for called app (if error).
So,
nice -e --19 sleep 99
would return immediately if not root with exit status for EPERM (and
no text); sleep would not be executed.
and for -w case:
nice -w --19 ls noexist
would return status for EPERM, and message:
ls: cannot access 'noexist': No such file or directory
Seems those would cover most possibly wants, though
the first would be enough to determine if nice is going to work.
Not an earth-shattering change, but at least it would allow
some way to check if nice is going to work or not so
one could not use it where it would fail (and not
generate an error message).
Thanks,..
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Subject: bug#30928: no error val returned by 'nice' failure?
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From: =?UTF-8?Q?P=C3=A1draig?= Brady <P@HIDDEN>
Message-ID: <cc8682e3-6bb0-0213-ff59-2d4921f53508@HIDDEN>
Date: Sat, 31 Mar 2018 16:00:36 -0700
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On 24/03/18 16:32, L A Walsh wrote:
>
>
> Paul Eggert wrote:
>> L A Walsh wrote:
>>> how do you tell if the resetting of the
>>> priority worked or failed?
>>
>> I guess you're supposed to look at stderr, which is what you did.
>>
>> This is the way 'nice' has behaved for quite some time, and it's what POSIX
>> specifies. We'd need a real good reason to change it, given that changing it
>> would no doubt break stuff.
> ---
> How about a flag, like -e for 'fail on failure to change priority' and
> (maybe less important or useful) '-w' to only return nice's return
> value, with the posix error message returned for called app (if error).
>
> So,
> nice -e --19 sleep 99
> would return immediately if not root with exit status for EPERM (and
> no text); sleep would not be executed.
>
> and for -w case:
>
> nice -w --19 ls noexist
> would return status for EPERM, and message:
> ls: cannot access 'noexist': No such file or directory
>
> Seems those would cover most possibly wants, though
> the first would be enough to determine if nice is going to work.
>
> Not an earth-shattering change, but at least it would allow
> some way to check if nice is going to work or not so
> one could not use it where it would fail (and not
> generate an error message).
I wonder could we special case `nice true`
to indicate the nice return, so you could then:
nice true && nice cmd || exit
That would be forwards compat,
and backwards compat in the sense it would degrade to the current situation.
It's probably a bit hacky though.
Pádraig
X-Loop: help-debbugs@HIDDEN
Subject: bug#30928: no error val returned by 'nice' failure?
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P=C3=A1draig Brady wrote:
> I wonder could we special case `nice true`
> to indicate the nice return
That would lead to a problem where 'nice true' succeeds but 'nice cmd' (f=
or=20
whatever reason) does not. Perhaps the OS has a limit as to how many proc=
esses=20
you can 'nice', for example. It'd be safer to add an option to avoid such=
race=20
conditions. Plus, as you mention it'd be less hacky, which means it'd be =
more=20
straightforward to document.
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