t/lei-refresh-mail-sync: avoid kill+sleep loop

While we can't waitpid() on daemonized process, we can abuse the
lack of FD_CLOEXEC to detect a process death.  This saves
roughly 400ms for this slow test.

1 files changed, 3 insertions, 0 deletions

diff --git a/lib/PublicInbox/TestCommon.pm b/lib/PublicInbox/TestCommon.pm
index 1fe7931e..8a34e45a 100644
--- a/lib/PublicInbox/TestCommon.pm
+++ b/lib/PublicInbox/TestCommon.pm
@@ -480,6 +480,9 @@ sub start_script {
         my $pid = fork // die "fork: $!\n";
         if ($pid == 0) {
                 eval { PublicInbox::DS->Reset };
+                for (@{delete($opt->{-CLOFORK}) // []}) {
+                        close($_) or die "close $!";
+                }
                 # pretend to be systemd (cf. sd_listen_fds(3))
                 # 3 == SD_LISTEN_FDS_START
                 my $fd;