/*
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* Copyright (C) 2014 The Android Open Source Project
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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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*/
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#include "scoped_flock.h"
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#include "base/common_art_test.h"
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namespace art {
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class ScopedFlockTest : public CommonArtTest {};
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TEST_F(ScopedFlockTest, TestLocking) {
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ScratchFile scratch_file;
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std::string error_msg;
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// NOTE: Locks applied using flock(2) and fcntl(2) are oblivious
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// to each other, so attempting to query locks set by flock using
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// using fcntl(,F_GETLK,) will not work. see kernel doc at
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// Documentation/filesystems/locks.txt.
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{
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ScopedFlock file_lock = LockedFile::Open(scratch_file.GetFilename().c_str(),
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&error_msg);
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ASSERT_TRUE(file_lock.get() != nullptr);
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// Attempt to acquire a second lock on the same file. This must fail.
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ScopedFlock second_lock = LockedFile::Open(scratch_file.GetFilename().c_str(),
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O_RDONLY,
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/* block= */ false,
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&error_msg);
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ASSERT_TRUE(second_lock.get() == nullptr);
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ASSERT_TRUE(!error_msg.empty());
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}
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{
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// Attempt to reacquire the lock once the first lock has been released, this
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// must succeed.
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ScopedFlock file_lock = LockedFile::Open(scratch_file.GetFilename().c_str(),
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&error_msg);
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ASSERT_TRUE(file_lock.get() != nullptr);
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}
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{
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ScopedFlock file_lock = LockedFile::Open("/will/not/exist",
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&error_msg);
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ASSERT_TRUE(file_lock.get() == nullptr);
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}
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}
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} // namespace art
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