+sub check_env_sanity () {
+ my $blocked = new POSIX::SigSet;
+ sigprocmask SIG_UNBLOCK, $blocked, $blocked or die $!;
+
+ eval {
+ foreach my $name (qw(PIPE CHLD)) {
+ my $signame = "SIG$name";
+ my $signum = eval "POSIX::$signame" // die;
+ ($SIG{$name} // 'DEFAULT') eq 'DEFAULT' or
+ die "$signame is set to something other than SIG_DFL\n";
+ $blocked->ismember($signum) and
+ die "$signame is blocked\n";
+ }
+ };
+ return unless $@;
+ chomp $@;
+ fail <<END;
+On entry to dgit, $@
+This is a bug produced by something in in your execution environment.
+Giving up.
+END
+}
+
+