$w->blocking($blk);
seek($fh, 0, SEEK_SET) or BAIL_OUT "seek: $!";
truncate($fh, 0) or BAIL_OUT "truncate: $!";
- defined(my $pid = fork) or BAIL_OUT "fork: $!";
+ my $pid = fork // BAIL_OUT "fork: $!";
if ($pid == 0) {
close $w;
tick; # wait for parent to block on writev