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Date:   Mon, 21 Dec 2020 20:58:11 +0100
From:   Steffen Nurpmeso <steffen@sdaoden.eu>
To:     DASH shell mailing list <dash@vger.kernel.org>
Subject: Re: dash 0.5.11.2: somehow falsely waits
Message-ID: <20201221195811.bKsCb%steffen@sdaoden.eu>
In-Reply-To: <20201221193621.eKxnM%steffen@sdaoden.eu>
References: <20201220014300.8lXtI%steffen@sdaoden.eu>
 <20201221193621.eKxnM%steffen@sdaoden.eu>
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one more note..

Steffen Nurpmeso wrote in
 <20201221193621.eKxnM%steffen@sdaoden.eu>:
 |Steffen Nurpmeso wrote in
 | <20201220014300.8lXtI%steffen@sdaoden.eu>:
 ||There is another issue with at least dash (the others not yet
 ||tested).  I cloned the git repo and it is still present at
 ||6ba88b3ed28fb4b52f20b730194c4ad3d8aad037.
 ||
 ||With the original test script of what is in "Re: dash 0.5.11.2,
 ||busybox sh 1.32.0, FreeBSD 12.2 sh: spring TTOU but should not
 ||i think" the sleeper will randomly wake too early for whatever
 ||reason.  The sleeper is:
 ||
 ||  i=
 ||  trap 'i=1' USR1 # "reaper (actually a notify timer only) is up"
 ||  (
 ||      parent=${$}
 ||      sleeper= int=0 hot=0
 ||      trap '' EXIT HUP QUIT CHLD
 ||      trap 'exit 0' INT
 ||      trap '
 ||         int=1 hot=1
 ||         [ -n "${sleeper}" ] && kill -TERM ${sleeper} >/dev/null 2>&1
 ||      ' USR1
 ||      trap '
 ||         int=1 hot=0
 ||         [ -n "${sleeper}" ] && kill -TERM ${sleeper} >/dev/null 2>&1
 ||      ' USR2
 ||      trap '
 ||         [ -n "${sleeper}" ] && kill -TERM ${sleeper} >/dev/null 2>&1
 ||         echo "Stopping job reaper"
 ||         exit 0
 ||      ' TERM
 ||
 ||      # traps are setup, notify parent that we are up and running
 ||      kill -USR1 ${parent} >/dev/null 2>&1
 ||
 ||      while :; do
 ||         int=0

I seem to get a hundred percent reliability when i insert a

         </dev/null ${cat} >/dev/null

 ||         /bin/sleep ${JOBWAIT} &
 ||         sleeper=${!}
 ||         wait ${sleeper}
 ||         sleeper=
 ||         [ "${int}${hot}" = 01 ] && kill -USR1 ${parent} >/dev/null 2>&1
 ||      done
 ||   ) </dev/null & #>/dev/null 2>&1 &
 ||   JOBREAPER=${!}

Hope that helps, ciao!

--steffen
|
|Der Kragenbaer,                The moon bear,
|der holt sich munter           he cheerfully and one by one
|einen nach dem anderen runter  wa.ks himself off
|(By Robert Gernhardt)