+ require_mods('Net::Server::Daemonize', 52);
+ $has_sigfd or skip('signalfd / EVFILT_SIGNAL not available', 52);
+ my $pid_file = "$tmpdir/pid";
+ my $read_pid = sub {
+ my $f = shift;
+ open my $fh, '<', $f or die "open $f failed: $!";
+ my $pid = do { local $/; <$fh> };
+ chomp($pid) or die("pid file not ready $!");
+ $pid;
+ };
+
+ for my $w (qw(-W0 -W1)) {
+ pipe(my ($p0, $p1)) or xbail "pipe: $!";
+ fcntl($p1, F_SETFD, 0) or xbail "fcntl: $!"; # clear FD_CLOEXEC
+ # wait for daemonization
+ $spawn_httpd->("-l$unix", '-D', '-P', $pid_file, $w);
+ close $p1 or xbail "close: $!";
+ $td->join;
+ is($?, 0, "daemonized $w process");
+ check_sock($unix);
+ ok(-s $pid_file, "$w pid file written");
+ my $pid = $read_pid->($pid_file);
+ is(kill('TERM', $pid), 1, "signaled daemonized $w process");
+ vec(my $rvec = '', fileno($p0), 1) = 1;
+ is(select($rvec, undef, undef, 1), 1, 'timeout for pipe HUP');
+ is(my $undef = <$p0>, undef, 'process closed pipe writer at exit');
+ ok(!-e $pid_file, "$w pid file unlinked at exit");
+ }
+
+ my $httpd = abs_path('blib/script/public-inbox-httpd');
+ $psgi = abs_path($psgi);
+ my $opt = { run_mode => 0 };
+ my @args = ("-l$unix", '-D', '-P', $pid_file, -1, $out, -2, $err);
+
+ if ('USR2 upgrades with workers') {
+ pipe(my ($p0, $p1)) or xbail "pipe: $!";
+ fcntl($p1, F_SETFD, 0) or xbail "fcntl: $!"; # clear FD_CLOEXEC
+
+ $td = start_script([$httpd, @args, $psgi], undef, $opt);
+ close($p1) or xbail "close: $!";
+ $td->join;
+ is($?, 0, "daemonized process again");
+ check_sock($unix);
+ ok(-s $pid_file, 'pid file written');
+ my $pid = $read_pid->($pid_file);
+
+ # stop worker to ensure check_sock below hits $new_pid
+ kill('TTOU', $pid) or die "TTOU failed: $!";
+
+ kill('USR2', $pid) or die "USR2 failed: $!";
+ delay_until(sub {
+ $pid != (eval { $read_pid->($pid_file) } // $pid)
+ });
+ my $new_pid = $read_pid->($pid_file);
+ isnt($new_pid, $pid, 'new child started');
+ ok($new_pid > 0, '$new_pid valid');
+ delay_until(sub { -s "$pid_file.oldbin" });
+ my $old_pid = $read_pid->("$pid_file.oldbin");
+ is($old_pid, $pid, '.oldbin pid file written');
+ ok($old_pid > 0, '$old_pid valid');
+
+ check_sock($unix); # ensures $new_pid is ready to receive signals
+
+ # first, back out of the upgrade
+ kill('QUIT', $new_pid) or die "kill new PID failed: $!";
+ delay_until(sub {
+ $pid == (eval { $read_pid->($pid_file) } // 0)
+ });
+ is($read_pid->($pid_file), $pid, 'old PID file restored');
+ ok(!-f "$pid_file.oldbin", '.oldbin PID file gone');
+
+ # retry USR2 upgrade
+ kill('USR2', $pid) or die "USR2 failed: $!";
+ delay_until(sub {
+ $pid != (eval { $read_pid->($pid_file) } // $pid)
+ });
+ $new_pid = $read_pid->($pid_file);
+ isnt($new_pid, $pid, 'new child started again');
+ $old_pid = $read_pid->("$pid_file.oldbin");
+ is($old_pid, $pid, '.oldbin pid file written');
+
+ # drop the old parent
+ kill('QUIT', $old_pid) or die "QUIT failed: $!";
+ delay_until(sub { !kill(0, $old_pid) }); # UGH
+
+ ok(!-f "$pid_file.oldbin", '.oldbin PID file gone');
+
+ # drop the new child
+ check_sock($unix);
+ kill('QUIT', $new_pid) or die "QUIT failed: $!";
+
+ vec(my $rvec = '', fileno($p0), 1) = 1;
+ is(select($rvec, undef, undef, 1), 1, 'timeout for pipe HUP');
+ is(my $u = <$p0>, undef, 'process closed pipe writer at exit');
+
+ ok(!-f $pid_file, 'PID file is gone');
+ }
+
+ if ('try USR2 without workers (-W0)') {
+ pipe(my ($p0, $p1)) or xbail "pipe: $!";
+ fcntl($p1, F_SETFD, 0) or xbail "fcntl: $!"; # clear FD_CLOEXEC
+ $td = start_script([$httpd, @args, '-W0', $psgi], undef, $opt);
+ close $p1 or xbail "close: $!";
+ $td->join;
+ is($?, 0, 'daemonized w/o workers');
+ $register_exit_fifo->($unix, $f1);
+ my $pid = $read_pid->($pid_file);
+
+ # replace running process
+ kill('USR2', $pid) or xbail "USR2 failed: $!";
+ open my $fh, '<', $f1 or xbail "open($f1): $!";
+ is(my $bye = <$fh>, "bye from $pid\n", 'got FIFO bye');
+
+ check_sock($unix);
+ $pid = $read_pid->($pid_file);
+ kill('QUIT', $pid) or xbail "USR2 failed: $!";
+
+ vec(my $rvec = '', fileno($p0), 1) = 1;
+ is(select($rvec, undef, undef, 1), 1, 'timeout for pipe HUP');
+ is(my $u = <$p0>, undef, 'process closed pipe writer at exit');
+ ok(!-f $pid_file, 'PID file is gone');