1 /*
2 * Copyright (C) 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "scoped_flock.h"
18
19 #include "base/common_art_test.h"
20
21 namespace art {
22
23 class ScopedFlockTest : public CommonArtTest {};
24
TEST_F(ScopedFlockTest,TestLocking)25 TEST_F(ScopedFlockTest, TestLocking) {
26 ScratchFile scratch_file;
27 std::string error_msg;
28
29 // NOTE: Locks applied using flock(2) and fcntl(2) are oblivious
30 // to each other, so attempting to query locks set by flock using
31 // using fcntl(,F_GETLK,) will not work. see kernel doc at
32 // Documentation/filesystems/locks.txt.
33 {
34 ScopedFlock file_lock = LockedFile::Open(scratch_file.GetFilename().c_str(),
35 &error_msg);
36 ASSERT_TRUE(file_lock.get() != nullptr);
37
38 // Attempt to acquire a second lock on the same file. This must fail.
39 ScopedFlock second_lock = LockedFile::Open(scratch_file.GetFilename().c_str(),
40 O_RDONLY,
41 /* block= */ false,
42 &error_msg);
43 ASSERT_TRUE(second_lock.get() == nullptr);
44 ASSERT_TRUE(!error_msg.empty());
45 }
46
47 {
48 // Attempt to reacquire the lock once the first lock has been released, this
49 // must succeed.
50 ScopedFlock file_lock = LockedFile::Open(scratch_file.GetFilename().c_str(),
51 &error_msg);
52 ASSERT_TRUE(file_lock.get() != nullptr);
53 }
54
55 {
56 ScopedFlock file_lock = LockedFile::Open("/will/not/exist",
57 &error_msg);
58 ASSERT_TRUE(file_lock.get() == nullptr);
59 }
60 }
61
62 } // namespace art
63