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// Copyright 2018 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package vfs
import (
"testing"
"gvisor.dev/gvisor/pkg/abi/linux"
"gvisor.dev/gvisor/pkg/sentry/contexttest"
"gvisor.dev/gvisor/pkg/usermem"
"gvisor.dev/gvisor/pkg/waiter"
)
func TestEventFD(t *testing.T) {
initVals := []uint64{
0,
// Using a non-zero initial value verifies that writing to an
// eventfd signals when the eventfd's counter was already
// non-zero.
343,
}
for _, initVal := range initVals {
ctx := contexttest.Context(t)
vfsObj := &VirtualFilesystem{}
if err := vfsObj.Init(); err != nil {
t.Fatalf("VFS init: %v", err)
}
// Make a new eventfd that is writable.
eventfd, err := vfsObj.NewEventFD(initVal, false, linux.O_RDWR)
if err != nil {
t.Fatalf("NewEventFD failed: %v", err)
}
defer eventfd.DecRef()
// Register a callback for a write event.
w, ch := waiter.NewChannelEntry(nil)
eventfd.EventRegister(&w, waiter.EventIn)
defer eventfd.EventUnregister(&w)
data := []byte("00000124")
// Create and submit a write request.
n, err := eventfd.Write(ctx, usermem.BytesIOSequence(data), WriteOptions{})
if err != nil {
t.Fatal(err)
}
if n != 8 {
t.Errorf("eventfd.write wrote %d bytes, not full int64", n)
}
// Check if the callback fired due to the write event.
select {
case <-ch:
default:
t.Errorf("Didn't get notified of EventIn after write")
}
}
}
func TestEventFDStat(t *testing.T) {
ctx := contexttest.Context(t)
vfsObj := &VirtualFilesystem{}
if err := vfsObj.Init(); err != nil {
t.Fatalf("VFS init: %v", err)
}
// Make a new eventfd that is writable.
eventfd, err := vfsObj.NewEventFD(0, false, linux.O_RDWR)
if err != nil {
t.Fatalf("NewEventFD failed: %v", err)
}
defer eventfd.DecRef()
statx, err := eventfd.Stat(ctx, StatOptions{
Mask: linux.STATX_BASIC_STATS,
})
if err != nil {
t.Fatalf("eventfd.Stat failed: %v", err)
}
if statx.Size != 0 {
t.Errorf("eventfd size should be 0")
}
}
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