Exec from signal handler terminates the process itself

[mil]

In bash/ash/dash, if you run exec $0 from within a signal handler things work fine and run in an infinite loop as they should:

#!/usr/bin/env osh
trap hup HUP

hup() {
  echo "hup handler"
  exec $0
}

main() {
  {
    echo subproc start
    sleep 1
    kill -HUP 0
  } &

  echo mainproc
  sleep 999
}

main

In osh, this same script just terminates immediately at exec $0.

[andychu]

Sorry for not responding to this. Does this break a program or did you find this through testing?

I just published a post that is largely about signal handlers, so maybe this new model will help with this difference ...

http://www.oilshell.org/blog/2022/01/notes-themes.html

But I can't think of a reason someone would want this, so it's probably low priority ...