On 9/22/15 8:18 AM, Greg Wooledge wrote:
> On Mon, Sep 21, 2015 at 10:07:55PM +0100, Stephane Chazelas wrote:
>> Maybe the test scenario was not clear:
>>
>> bash -c 'cmd; echo hi'
>>
>> is run from an interactive shell, cmd is a long running
>> application (the problem that sparked this discussion was with
>> ping and I showed examples with an inline-script calling sleep)
>
> Just for the record, ping is the *classic* example of an incorrectly
> written application that traps SIGINT but doesn't kill itself with
> SIGINT afterward. (This seems to be true on multiple systems -- at
> the very least, HP-UX and Linux pings both suffer from it.)
>
> A loop like this works as expected:
>
> while true; do
> sleep 1
> done
>
> A loop like this does not:
>
> while true; do
> ping -c 1 some.host # or on HP-UX, ping some.host -n 1
> done
If you decide, as bash has, to allow the foreground job to determine what
to do with SIGINT, you have to cope with software like ping.
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, ITS, CWRU [email protected] http://cnswww.cns.cwru.edu/~chet/
