Date: Tue, 14 Feb 2012 15:25:07 -0500 From: Matthew Story <matthewstory@gmail.com> To: freebsd-hackers@freebsd.org Subject: Re: xargs short-circuit Message-ID: <CAB%2B9ogfqyXb5PAWLWt3MFTcvbhi_1vF0ffOByT8TiMqS9sOsoQ@mail.gmail.com> In-Reply-To: <CAB%2B9ogfWXOGyv7uSDomSP0QY4goeaSGncGCTD10Jjh0fZ627FQ@mail.gmail.com> References: <CAB%2B9ogcT3OxMKwTY%2B8KfzJfcBiHRBnSdSxcy2eYR6bn=uoL1UQ@mail.gmail.com> <20120214193530.GA42580@stack.nl> <CAB%2B9ogfWXOGyv7uSDomSP0QY4goeaSGncGCTD10Jjh0fZ627FQ@mail.gmail.com>
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On Tue, Feb 14, 2012 at 2:37 PM, Matthew Story <matthewstory@gmail.com>wrote:
> On Tue, Feb 14, 2012 at 2:35 PM, Jilles Tjoelker <jilles@stack.nl> wrote:
>
>> On Tue, Feb 14, 2012 at 01:34:49PM -0500, Matthew Story wrote:
>> > After reading the man-page, and browsing around the internet for a
>> minute,
>> > I was just wondering if there is an option in (any) xargs to
>> short-circuit
>> > on first failure of [utility [arguments]].
>>
>> > e.g.
>>
>> > $ jot - 1 10 | xargs -e -n1 sh -c 'echo "$*"; echo exit 1' worker ||
>> echo $?
>> > 1
>> > 1
>>
>> > such that any non-0 exit code in a child process would cause xargs to
>> stop
>> > processing. seems like this would be a nice feature to have.
>>
>> As per xargs(1), you can do this by having the command exit on a signal
>> or with a value of 255.
>>
>
exit 255 with -P, and SIGTERM (with or without -P) causes FreeBSD xargs to
orphan, is this desirable behavior? findutils xargs orphans on 255 and
SIGTERM (with -P), but does not orphan without -P when SIGTERM is sent. I
would expect xargs to propegate the signal, or wait, although the man page
does say "immediately", the POSIX specification is less clear ... this
makes it more-or-less unsuitable for my needs, but i guess i could do
something like:
... | xargs sh -c '... exit 255;'
if [ $? -ne 0 ]; then
wait
# cleanup
exit 1
fi
>
> Yes indeed it does ... should have scoured further, thanks!
>
>
>>
>> --
>> Jilles Tjoelker
>>
>
>
>
> --
> regards,
> matt
>
--
regards,
matt
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