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