my ($cmd, $env, $opts) = @_;
pipe(my ($r, $w)) or die "pipe: $!\n";
$opts ||= {};
- my $blocking = $opts->{Blocking};
- IO::Handle::blocking($r, $blocking) if defined $blocking;
$opts->{1} = fileno($w);
my $pid = spawn($cmd, $env, $opts);
return unless defined $pid;