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/*
* SPDX-License-Identifier: GPL-2.0-only
*
* SPDX-FileCopyrightText: 2025 Jérémie Galarneau <jeremie.galarneau@efficios.com>
*/
#include <common/eventfd.hpp>
#include <common/format.hpp>
#include <common/make-unique.hpp>
#include <common/poller.hpp>
#include <common/timerfd.hpp>
#include <tap/tap.h>
/* For error.hpp */
int lttng_opt_quiet;
int lttng_opt_verbose;
int lttng_opt_mi;
namespace {
void test_event_fd_increment_decrement()
{
lttng::eventfd event_fd;
lttng::poller poller;
lttng::poller::event_type reported_events = lttng::poller::event_type::NONE;
poller.add(event_fd,
lttng::poller::event_type::READABLE,
[&reported_events](lttng::poller::event_type events) {
reported_events = events;
});
poller.poll(lttng::poller::timeout_type::NO_WAIT);
ok(reported_events == lttng::poller::event_type::NONE,
"Poller reports no pending events initially");
event_fd.increment();
poller.poll(lttng::poller::timeout_type::NO_WAIT);
ok(reported_events == lttng::poller::event_type::READABLE,
"Eventfd is marked as readable after increment");
event_fd.decrement();
reported_events = lttng::poller::event_type::NONE;
poller.poll(lttng::poller::timeout_type::NO_WAIT);
ok(reported_events == (lttng::poller::event_type::NONE),
"Eventfd has no event after being decremented");
}
void test_multiple_fds()
{
lttng::eventfd event_fd1, event_fd2;
lttng::poller poller;
lttng::poller::event_type events1 = lttng::poller::event_type::NONE;
lttng::poller::event_type events2 = lttng::poller::event_type::NONE;
poller.add(event_fd1,
lttng::poller::event_type::READABLE,
[&events1](lttng::poller::event_type e) { events1 = e; });
poller.add(event_fd2,
lttng::poller::event_type::READABLE,
[&events2](lttng::poller::event_type e) { events2 = e; });
event_fd1.increment();
poller.poll(lttng::poller::timeout_type::NO_WAIT);
ok(events1 == lttng::poller::event_type::READABLE, "First eventfd triggers its callback");
ok(events2 == lttng::poller::event_type::NONE, "Second eventfd does not trigger");
event_fd1.decrement();
events1 = lttng::poller::event_type::NONE;
event_fd2.increment();
poller.poll(lttng::poller::timeout_type::NO_WAIT);
ok(events2 == lttng::poller::event_type::READABLE, "Second eventfd triggers its callback");
ok(events1 == lttng::poller::event_type::NONE, "First eventfd does not trigger again");
}
void test_modify_events()
{
lttng::eventfd event_fd;
lttng::poller poller;
lttng::poller::event_type events = lttng::poller::event_type::NONE;
poller.add(event_fd,
lttng::poller::event_type::READABLE,
[&events](lttng::poller::event_type e) { events = e; });
poller.modify(event_fd, lttng::poller::event_type::NONE);
event_fd.increment();
poller.poll(lttng::poller::timeout_type::NO_WAIT);
ok(events == lttng::poller::event_type::NONE,
"Callback not called after event mask set to NONE");
poller.modify(event_fd, lttng::poller::event_type::READABLE);
events = lttng::poller::event_type::NONE;
poller.poll(lttng::poller::timeout_type::NO_WAIT);
ok(events == lttng::poller::event_type::READABLE,
"Callback called after event mask restored to READABLE");
}
void test_remove_fd()
{
lttng::eventfd event_fd;
lttng::poller poller;
bool called = false;
poller.add(event_fd,
lttng::poller::event_type::READABLE,
[&called](lttng::poller::event_type) { called = true; });
poller.remove(event_fd);
event_fd.increment();
poller.poll(lttng::poller::timeout_type::NO_WAIT);
ok(!called, "Callback not called after FD is removed");
}
void test_poll_timeout()
{
const lttng::poller poller;
/* No FDs added, should return immediately. */
poller.poll(lttng::poller::timeout_type::WAIT_FOREVER);
ok(1, "Poll with an infinite timeout and no FDs returns immediately");
}
void test_poll_timerfd()
{
lttng::poller poller;
lttng::timerfd timer_fd;
lttng::poller::event_type events = lttng::poller::event_type::NONE;
bool fired = false;
poller.add(timer_fd,
lttng::poller::event_type::READABLE,
[&events, &fired](lttng::poller::event_type e) {
events = e;
fired = true;
});
const auto before_arming = std::chrono::steady_clock::now();
timer_fd.settime(std::chrono::milliseconds(500));
poller.poll(lttng::poller::timeout_type::WAIT_FOREVER);
const auto return_time = std::chrono::steady_clock::now();
const auto elapsed_time = return_time - before_arming;
const auto elapsed_time_ms =
std::chrono::duration_cast<std::chrono::milliseconds>(elapsed_time).count();
ok(events == lttng::poller::event_type::READABLE,
"Timerfd triggered with a readable event");
ok(elapsed_time_ms >= 500,
"%s",
fmt::format("Timerfd triggered after at least 500ms elapsed ({}ms)", elapsed_time_ms)
.c_str());
events = lttng::poller::event_type::NONE;
fired = false;
poller.poll(lttng::poller::timeout_type::NO_WAIT);
ok(events == lttng::poller::event_type::READABLE && fired == true,
"Timerfd re-triggers immediately if not reset");
fmt::print("Timerfd re-triggers immediately if not reset: events={}, fired={}\n",
events,
fired);
events = lttng::poller::event_type::NONE;
fired = false;
timer_fd.reset();
poller.poll(lttng::poller::timeout_type::NO_WAIT);
ok(events == lttng::poller::event_type::NONE && fired == false,
"Timerfd not triggered after poll (one shot behaviour expected)");
events = lttng::poller::event_type::NONE;
fired = false;
timer_fd.settime(std::chrono::hours(24));
poller.poll(lttng::poller::timeout_ms(500));
ok(events == lttng::poller::event_type::NONE && fired == false,
"Timerfd not triggered after poll (24h timerfd set and 500ms timeout)");
}
} /* namespace */
int main([[maybe_unused]] int argc, [[maybe_unused]] char **argv)
{
try {
plan_tests(16);
test_event_fd_increment_decrement();
test_multiple_fds();
test_modify_events();
test_remove_fd();
test_poll_timeout();
test_poll_timerfd();
} catch (const std::exception& e) {
diag("Unhandled exception: %s", e.what());
return 1;
}
return exit_status();
}
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