My approach would be to fork and check the exit. You'd probably want to add a timeout feature to kill tenacious subs that fail to exit. Really stripped-down example:
use strict;
use warnings;
sub test_exit {
my ($subr, $exit_val) = @_;
my $subp = fork;
if ($subp) {
my $done = waitpid($subp, 0);
print "Process $done Exited with ".($?>>8).", expected $exit_val\n
+";
}
else {
$subr->();
warn "Did not exit\n";
exit (~$exit_val);
}
}
test_exit(sub{print "Process has run\n"; exit(42)}, 42);
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