[kwlug-disc] bash subprocesses & traps

[Chris Frey]

On Sun, Jul 28, 2024 at 12:18:43PM -0400, John Steel via kwlug-disc wrote:
> finalize() {
>     pgrep -fl "cat fifo $FIFO_FILE" > /dev/stderr
>     pgrep -fl sha256sum > /dev/stderr
>     
>     cat_pid="$(cat "$CAT_PID_FILE")"
>     rm "$CAT_PID_FILE"
>     kill -s SIGTERM "$cat_pid" && wait "$cat_pid"
>     exit 0
> }

In my tests, the "exit 0" affects the entire script, not just the
signal handler.  Perhaps in combination with SIGTERM, and the exit 0
here, it prevents the sha256sum from completing?

In any case, now that you're not relying on signals to exit your
script, you can get rid of exit 0 here, and SIGTERM should work
just as well as SIGHUP.

That's my guess.

- Chris