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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 semaphore
import (
"testing"
"gvisor.dev/gvisor/pkg/abi/linux"
"gvisor.dev/gvisor/pkg/context"
"gvisor.dev/gvisor/pkg/sentry/contexttest"
"gvisor.dev/gvisor/pkg/sentry/kernel/auth"
"gvisor.dev/gvisor/pkg/syserror"
)
func executeOps(ctx context.Context, t *testing.T, set *Set, ops []linux.Sembuf, block bool) chan struct{} {
ch, _, err := set.executeOps(ctx, ops, 123)
if err != nil {
t.Fatalf("ExecuteOps(ops) failed, err: %v, ops: %+v", err, ops)
}
if block {
if ch == nil {
t.Fatalf("ExecuteOps(ops) got: nil, expected: !nil, ops: %+v", ops)
}
if signalled(ch) {
t.Fatalf("ExecuteOps(ops) channel should not have been signalled, ops: %+v", ops)
}
} else {
if ch != nil {
t.Fatalf("ExecuteOps(ops) got: %v, expected: nil, ops: %+v", ch, ops)
}
}
return ch
}
func signalled(ch chan struct{}) bool {
select {
case <-ch:
return true
default:
return false
}
}
func TestBasic(t *testing.T) {
ctx := contexttest.Context(t)
set := &Set{ID: 123, sems: make([]sem, 1)}
ops := []linux.Sembuf{
{SemOp: 1},
}
executeOps(ctx, t, set, ops, false)
ops[0].SemOp = -1
executeOps(ctx, t, set, ops, false)
ops[0].SemOp = -1
ch1 := executeOps(ctx, t, set, ops, true)
ops[0].SemOp = 1
executeOps(ctx, t, set, ops, false)
if !signalled(ch1) {
t.Fatalf("ExecuteOps(ops) channel should not have been signalled, ops: %+v", ops)
}
}
func TestWaitForZero(t *testing.T) {
ctx := contexttest.Context(t)
set := &Set{ID: 123, sems: make([]sem, 1)}
ops := []linux.Sembuf{
{SemOp: 0},
}
executeOps(ctx, t, set, ops, false)
ops[0].SemOp = -2
ch1 := executeOps(ctx, t, set, ops, true)
ops[0].SemOp = 0
executeOps(ctx, t, set, ops, false)
ops[0].SemOp = 1
executeOps(ctx, t, set, ops, false)
ops[0].SemOp = 0
chZero1 := executeOps(ctx, t, set, ops, true)
ops[0].SemOp = 0
chZero2 := executeOps(ctx, t, set, ops, true)
ops[0].SemOp = 1
executeOps(ctx, t, set, ops, false)
if !signalled(ch1) {
t.Fatalf("ExecuteOps(ops) channel should have been signalled, ops: %+v, set: %+v", ops, set)
}
ops[0].SemOp = -2
executeOps(ctx, t, set, ops, false)
if !signalled(chZero1) {
t.Fatalf("ExecuteOps(ops) channel zero 1 should have been signalled, ops: %+v, set: %+v", ops, set)
}
if !signalled(chZero2) {
t.Fatalf("ExecuteOps(ops) channel zero 2 should have been signalled, ops: %+v, set: %+v", ops, set)
}
}
func TestNoWait(t *testing.T) {
ctx := contexttest.Context(t)
set := &Set{ID: 123, sems: make([]sem, 1)}
ops := []linux.Sembuf{
{SemOp: 1},
}
executeOps(ctx, t, set, ops, false)
ops[0].SemOp = -2
ops[0].SemFlg = linux.IPC_NOWAIT
if _, _, err := set.executeOps(ctx, ops, 123); err != syserror.ErrWouldBlock {
t.Fatalf("ExecuteOps(ops) wrong result, got: %v, expected: %v", err, syserror.ErrWouldBlock)
}
ops[0].SemOp = 0
ops[0].SemFlg = linux.IPC_NOWAIT
if _, _, err := set.executeOps(ctx, ops, 123); err != syserror.ErrWouldBlock {
t.Fatalf("ExecuteOps(ops) wrong result, got: %v, expected: %v", err, syserror.ErrWouldBlock)
}
}
func TestUnregister(t *testing.T) {
ctx := contexttest.Context(t)
r := NewRegistry(auth.NewRootUserNamespace())
set, err := r.FindOrCreate(ctx, 123, 2, linux.FileMode(0x600), true, true, true)
if err != nil {
t.Fatalf("FindOrCreate() failed, err: %v", err)
}
if got := r.FindByID(set.ID); got.ID != set.ID {
t.Fatalf("FindById(%d) failed, got: %+v, expected: %+v", set.ID, got, set)
}
ops := []linux.Sembuf{
{SemOp: -1},
}
chs := make([]chan struct{}, 0, 5)
for i := 0; i < 5; i++ {
ch := executeOps(ctx, t, set, ops, true)
chs = append(chs, ch)
}
creds := auth.CredentialsFromContext(ctx)
if err := r.RemoveID(set.ID, creds); err != nil {
t.Fatalf("RemoveID(%d) failed, err: %v", set.ID, err)
}
if !set.dead {
t.Fatalf("set is not dead: %+v", set)
}
if got := r.FindByID(set.ID); got != nil {
t.Fatalf("FindById(%d) failed, got: %+v, expected: nil", set.ID, got)
}
for i, ch := range chs {
if !signalled(ch) {
t.Fatalf("channel %d should have been signalled", i)
}
}
}
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