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//go:build linux
package epoll
import (
"errors"
"math"
"os"
"testing"
"time"
"github.com/go-quicktest/qt"
"github.com/cilium/ebpf/internal/unix"
)
func TestPoller(t *testing.T) {
t.Parallel()
event, poller := mustNewPoller(t)
done := make(chan struct{}, 1)
read := func() {
defer func() {
done <- struct{}{}
}()
events := make([]unix.EpollEvent, 1)
n, err := poller.Wait(events, time.Time{})
if errors.Is(err, os.ErrClosed) {
return
}
if err != nil {
t.Error("Error from wait:", err)
return
}
if n != 1 {
t.Errorf("Got %d instead of 1 events", n)
}
if e := events[0]; e.Pad != 42 {
t.Errorf("Incorrect value in EpollEvent.Pad: %d != 42", e.Pad)
}
}
if err := event.add(1); err != nil {
t.Fatal(err)
}
go read()
select {
case <-done:
case <-time.After(time.Second):
t.Fatal("Timed out")
}
if _, err := event.read(); err != nil {
t.Fatal(err)
}
go read()
select {
case <-done:
t.Fatal("Wait doesn't block")
case <-time.After(time.Second):
}
if err := poller.Close(); err != nil {
t.Fatal("Close returns an error:", err)
}
select {
case <-done:
case <-time.After(time.Second):
t.Fatal("Close doesn't unblock Wait")
}
if err := poller.Close(); !errors.Is(err, os.ErrClosed) {
t.Fatal("Closing a second time doesn't return ErrClosed:", err)
}
}
func TestPollerDeadline(t *testing.T) {
t.Parallel()
_, poller := mustNewPoller(t)
events := make([]unix.EpollEvent, 1)
_, err := poller.Wait(events, time.Now().Add(-time.Second))
if !errors.Is(err, os.ErrDeadlineExceeded) {
t.Fatal("Expected os.ErrDeadlineExceeded on deadline in the past, got", err)
}
done := make(chan struct{})
go func() {
defer close(done)
_, err := poller.Wait(events, time.Now().Add(math.MaxInt64))
if !errors.Is(err, os.ErrClosed) {
t.Error("Expected os.ErrClosed when interrupting deadline, got", err)
}
}()
// Wait for the goroutine to enter the syscall.
time.Sleep(500 * time.Microsecond)
poller.Close()
<-done
}
func TestPollerFlush(t *testing.T) {
t.Parallel()
_, poller := mustNewPoller(t)
events := make([]unix.EpollEvent, 1)
done := make(chan struct{})
go func() {
defer close(done)
_, err := poller.Wait(events, time.Time{})
qt.Check(t, qt.ErrorIs(err, ErrFlushed))
}()
// Wait for the goroutine to enter the syscall.
time.Sleep(500 * time.Microsecond)
poller.Flush()
<-done
}
func mustNewPoller(t *testing.T) (*eventFd, *Poller) {
t.Helper()
event, err := newEventFd()
if err != nil {
t.Fatal(err)
}
t.Cleanup(func() { event.close() })
poller, err := New()
if err != nil {
t.Fatal(err)
}
t.Cleanup(func() { poller.Close() })
if err := poller.Add(event.raw, 42); err != nil {
t.Fatal("Can't add fd:", err)
}
return event, poller
}
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