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https://github.com/hanzoai/visor.git
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Fabricio VoznikaandgVisor bot
cecd7315bc
Docker maps stdin to `/dev/null` which doesn't support epoll. Host FD was ignoring the error and suceeding the epoll_ctl call from the container, giving false impressing that epoll would be notified. This required plumbing failure to all waiter.Waitable.EventRegister callers and implementers. Closes #6795 PiperOrigin-RevId: 414797621
100 lines
2.6 KiB
Go
100 lines
2.6 KiB
Go
// Copyright 2018 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package eventfd
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import (
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"testing"
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"gvisor.dev/gvisor/pkg/abi/linux"
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"gvisor.dev/gvisor/pkg/sentry/contexttest"
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"gvisor.dev/gvisor/pkg/sentry/vfs"
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"gvisor.dev/gvisor/pkg/usermem"
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"gvisor.dev/gvisor/pkg/waiter"
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)
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func TestEventFD(t *testing.T) {
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initVals := []uint64{
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0,
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// Using a non-zero initial value verifies that writing to an
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// eventfd signals when the eventfd's counter was already
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// non-zero.
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343,
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}
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for _, initVal := range initVals {
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ctx := contexttest.Context(t)
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vfsObj := &vfs.VirtualFilesystem{}
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if err := vfsObj.Init(ctx); err != nil {
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t.Fatalf("VFS init: %v", err)
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}
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// Make a new eventfd that is writable.
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eventfd, err := New(ctx, vfsObj, initVal, false, linux.O_RDWR)
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if err != nil {
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t.Fatalf("New() failed: %v", err)
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}
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defer eventfd.DecRef(ctx)
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// Register a callback for a write event.
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w, ch := waiter.NewChannelEntry(waiter.ReadableEvents)
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if err := eventfd.EventRegister(&w); err != nil {
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t.Fatalf("EventRegister(): %v", err)
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}
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defer eventfd.EventUnregister(&w)
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data := []byte("00000124")
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// Create and submit a write request.
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n, err := eventfd.Write(ctx, usermem.BytesIOSequence(data), vfs.WriteOptions{})
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if err != nil {
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t.Fatal(err)
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}
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if n != 8 {
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t.Errorf("eventfd.write wrote %d bytes, not full int64", n)
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}
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// Check if the callback fired due to the write event.
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select {
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case <-ch:
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default:
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t.Errorf("Didn't get notified of EventIn after write")
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}
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}
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}
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func TestEventFDStat(t *testing.T) {
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ctx := contexttest.Context(t)
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vfsObj := &vfs.VirtualFilesystem{}
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if err := vfsObj.Init(ctx); err != nil {
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t.Fatalf("VFS init: %v", err)
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}
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// Make a new eventfd that is writable.
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eventfd, err := New(ctx, vfsObj, 0, false, linux.O_RDWR)
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if err != nil {
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t.Fatalf("New() failed: %v", err)
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}
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defer eventfd.DecRef(ctx)
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statx, err := eventfd.Stat(ctx, vfs.StatOptions{
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Mask: linux.STATX_BASIC_STATS,
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})
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if err != nil {
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t.Fatalf("eventfd.Stat failed: %v", err)
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}
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if statx.Size != 0 {
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t.Errorf("eventfd size should be 0")
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}
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}
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