Re: return exit code in EXIT trap

[Robert E. Griffith]

On 8/8/22 16:38, Robert Elz wrote:
> There's no need for anything to make that work, when the trap action
> starts running $? is set to whatever it was just previously, and the
> code there can save and/or use that value however it sees the need.
Well I'll be. I had to write a script to test it because I was so sure 
that at least USR1 and USR2 did not.

Its a shame that for a 'feature' that is not even required, 'return' has 
been made quirky so that reusing good code in a trap handler breaks that 
code.


FYI: here is script I just used ...

   $ cat bin/trapExitCodeTest.sh
   #!/usr/bin/env bash
   if [ "$1" == "slowerror" ]; then
        sleep 0.5
        exit 45;
   fi
   sigToTest="${1:-USR1}"
   (
        trap 'echo "$sigToTest: last cmd exit = $?"' $sigToTest
        bash -c "$0 slowerror"
   )&
   child=$!
   sleep 0.2
   kill -$sigToTest $child
   sleep 1

   $ bin/trapExitCodeTest.sh
   USR1: last cmd exit = 45

--BobG