From 4f868db3675eeee5994edc4fe79a9a2583623747 Mon Sep 17 00:00:00 2001
From: Eric Wong <e@80x24.org>
Date: Mon, 24 Jun 2019 02:52:56 +0000
Subject: ds: reimplement IO::Poll support to look like epoll

At least the subset of epoll we use.  EPOLLET might be
difficult to emulate if we end up using it.
---
 t/ds-poll.t | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 58 insertions(+)
 create mode 100644 t/ds-poll.t

(limited to 't')

diff --git a/t/ds-poll.t b/t/ds-poll.t
new file mode 100644
index 00000000..a397ee06
--- /dev/null
+++ b/t/ds-poll.t
@@ -0,0 +1,58 @@
+# Copyright (C) 2019 all contributors <meta@public-inbox.org>
+# Licensed the same as Danga::Socket (and Perl5)
+# License: GPL-1.0+ or Artistic-1.0-Perl
+#  <https://www.gnu.org/licenses/gpl-1.0.txt>
+#  <https://dev.perl.org/licenses/artistic.html>
+use strict;
+use warnings;
+use Test::More;
+use PublicInbox::Syscall qw(:epoll);
+my $cls = 'PublicInbox::DSPoll';
+use_ok $cls;
+my $p = $cls->new;
+
+my ($r, $w, $x, $y);
+pipe($r, $w) or die;
+pipe($x, $y) or die;
+is(epoll_ctl($p, EPOLL_CTL_ADD, fileno($r), EPOLLIN), 0, 'add EPOLLIN');
+my $events = [];
+my $n = epoll_wait($p, 9, 0, $events);
+is_deeply($events, [], 'no events set');
+is($n, 0, 'nothing ready, yet');
+is(epoll_ctl($p, EPOLL_CTL_ADD, fileno($w), EPOLLOUT|EPOLLONESHOT), 0,
+	'add EPOLLOUT|EPOLLONESHOT');
+$n = epoll_wait($p, 9, -1, $events);
+is($n, 1, 'got POLLOUT event');
+is($events->[0]->[0], fileno($w), '$w ready');
+
+$n = epoll_wait($p, 9, 0, $events);
+is($n, 0, 'nothing ready after oneshot');
+is_deeply($events, [], 'no events set after oneshot');
+
+syswrite($w, '1') == 1 or die;
+for my $t (0..1) {
+	$n = epoll_wait($p, 9, $t, $events);
+	is($events->[0]->[0], fileno($r), "level-trigger POLLIN ready #$t");
+	is($n, 1, "only event ready #$t");
+}
+syswrite($y, '1') == 1 or die;
+is(epoll_ctl($p, EPOLL_CTL_ADD, fileno($x), EPOLLIN|EPOLLONESHOT), 0,
+	'EPOLLIN|EPOLLONESHOT add');
+is(epoll_wait($p, 9, -1, $events), 2, 'epoll_wait has 2 ready');
+my @fds = sort(map { $_->[0] } @$events);
+my @exp = sort((fileno($r), fileno($x)));
+is_deeply(\@fds, \@exp, 'got both ready FDs');
+
+# EPOLL_CTL_DEL doesn't matter for kqueue, we do it in native epoll
+# to avoid a kernel-wide lock; but its not needed for native kqueue
+# paths so DSKQXS makes it a noop (as did Danga::Socket::close).
+SKIP: {
+	if ($cls ne 'PublicInbox::DSPoll') {
+		skip "$cls doesn't handle EPOLL_CTL_DEL", 2;
+	}
+	is(epoll_ctl($p, EPOLL_CTL_DEL, fileno($r), 0), 0, 'EPOLL_CTL_DEL OK');
+	$n = epoll_wait($p, 9, 0, $events);
+	is($n, 0, 'nothing ready after EPOLL_CTL_DEL');
+};
+
+done_testing;
-- 
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