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Re: sh: killing a pipe head from the tail
On Tue, Dec 07, 2021 at 06:38:32PM +0100, Edgar Fuß wrote:
> So the context is a collectd exec plugin translating envstat output to collectd
> PUTVALs. The structure is about
> envstat -i 10 | while read ...
> printf "PUTVAL ... || exit 1
> After I realized what the problem was (SIGPIPE ignored), I thought what to do
> and the obvious solution (apart from patching collectd) is to trap - PIPE
> before calling envstat. But since that would make envstat continue to run
> until it next tries to output something, I was asking myself whether there
> was a more elegant solution where I could explicitly kill envstat from within
> the while loop instead.
In a similar situation I have written a script like this,
envstat -i 10 & echo $! > envstat.pid
) | while read ...
... || kill $(cat envstat.pid) && exit 1
Usually it's necessary to protect against the loop racing against the
creation of envstat.pid. Seems like there should be a better way.
dyoung%pobox.com@localhost Urbana, IL (217) 721-9981
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