From: Vincent Lefevre <vincent@vinc17.net>
To: zsh-workers@zsh.org
Subject: trap, eval and wait (was: [BUG] exec + builtin and traps)
Date: Tue, 12 Sep 2017 16:21:45 +0200 [thread overview]
Message-ID: <20170912142145.GA10597@cventin.lip.ens-lyon.fr> (raw)
In-Reply-To: <20170912131054.4f7c11a5@pwslap01u.europe.root.pri>
On 2017-09-12 13:10:54 +0100, Peter Stephenson wrote:
> On Tue, 12 Sep 2017 14:02:37 +0200
> Vincent Lefevre <vincent@vinc17.net> wrote:
> > Why is "foo" (from the trap) printed before "bar", then?
>
> OK, so it's on the *sub* list after the command before the &&
> (wait) has executed successfully, but before the foo is executed.
I still don't understand. Actually, the real issue is that "wait"
should not have terminated successfully. Perhaps, this should be
clearer with:
------------------------------------------------------------
trap 'echo foo' USR1
( sleep 1; kill -USR1 $$; sleep 1; echo child ) &
eval "wait && echo bar"
echo OK
sleep 2
------------------------------------------------------------
After 1 second, the following is printed:
foo
bar
OK
And after another second:
child
So, this means that the "wait" has ended due to the USR1 signal, not
by a process termination. But then, the fact that "wait" terminates
with the exit status 0 does not seem to be correct.
--
Vincent Lefèvre <vincent@vinc17.net> - Web: <https://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)
next prev parent reply other threads:[~2017-09-12 14:34 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20170912101045epcas2p4cae7e7df78ef035900f9c6099dc054fb@epcas2p4.samsung.com>
2017-09-12 10:02 ` [BUG] exec + builtin and traps Vincent Lefevre
2017-09-12 10:19 ` Peter Stephenson
2017-09-12 10:39 ` Vincent Lefevre
2017-09-12 10:50 ` Peter Stephenson
2017-09-12 11:42 ` Vincent Lefevre
2017-09-12 11:51 ` Peter Stephenson
2017-09-12 12:02 ` Vincent Lefevre
2017-09-12 12:10 ` Peter Stephenson
2017-09-12 14:21 ` Vincent Lefevre [this message]
2017-09-12 15:04 ` trap, eval and wait (was: [BUG] exec + builtin and traps) Peter Stephenson
2017-09-13 9:55 ` Peter Stephenson
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