getting the status of the left-hand side of a pipe in the right-hand side

[Vincent Lefevre <vincent@xxxxxxxxxx>]

I would like to get the status of the left-hand side of a pipe
in the right-hand size. Knowing whether it has terminated or not
should be sufficient.

Information is probably known from the job table:

zira% sleep 2 | { sleep 1; jobs }
[1]    running    sleep 2
zira% sleep 2 | { sleep 3; jobs }
[1]    done       sleep 2

but there may be other jobs in the session, so that I need to get
the right one.

The goal is that in the following

  ( trap '' INT; "$@" | { (less); kill -PIPE 0 } )

I want to avoid the "kill -PIPE 0" if the command "$@" has terminated,
in order to get its exit status.

-- 
Vincent Lefèvre <vincent@xxxxxxxxxx> - Web: <https://www.vinc17.net/>
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Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)