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 "common_runtime_test.h" 20 21 namespace art { 22 23 class ScopedFlockTest : public CommonRuntimeTest {}; 24 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
