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Date: Sat, 18 Feb 2017 11:24:22 +0100
From: Andre Albsmeier <Andre.Albsmeier@siemens.com>
To: Bart Schaefer <schaefer@brasslantern.com>
Cc: Andre Albsmeier <Andre.Albsmeier@siemens.com>, zsh-users@zsh.org
Subject: Re: exec'ing $0 in traps
Message-ID: <20170218102422.GA67180@bali>
References: <20170217081604.GA59728@bali>
 <170217120219.ZM11847@torch.brasslantern.com>
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User-Agent: Mutt/1.7.1 (2016-10-04)

On Fri, 17-Feb-2017 at 12:02:19 -0800, Bart Schaefer wrote:
> On Feb 17,  9:16am, Andre Albsmeier wrote:
> }
> } #!/bin/zsh
> } 
> } echo started
> } trap 'echo trapped; exec "$0"' 1
> } 
> } echo $$ > /tmp/blafasel
> } 
> } while read line; do
> }   echo line $line
> } done
> 
> Some combination of the "read" builtin plus calling "exec" from inside
> the signal handler is causing the HUP signal to remain blocked across
> the "exec" -- and re-installing the trap doesn't unblock it.

Too bad. Maybe this gets fixed one day. Meanwhile I use this:

#!/bin/zsh

restart=""
echo started

trap 'restart=1' 1

echo $$ > /tmp/blafasel

while :; do
  [ $restart ] && exec $0
  read line || exit 0
  echo line $line          
done


and it seems to do what I need...