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/* Copyright © 2006-2013 Roger Leigh <rleigh@debian.org>
*
* schroot is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* schroot is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see
* <http://www.gnu.org/licenses/>.
*
*********************************************************************/
#include <gtest/gtest.h>
#include <sbuild/lock.h>
#include <iostream>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <config.h>
class FileLockParameters
{
public:
sbuild::lock::type initial;
sbuild::lock::type establish;
bool willthrow;
FileLockParameters(sbuild::lock::type initial,
sbuild::lock::type establish,
bool willthrow):
initial(initial),
establish(establish),
willthrow(willthrow)
{}
};
class FileLock : public ::testing::TestWithParam<FileLockParameters>
{
public:
int fd;
sbuild::file_lock *lck;
FileLock():
fd(-1),
lck(0)
{
// Remove test file if it exists.
unlink(TESTDATADIR "/filelock.ex1");
}
virtual ~FileLock()
{}
void SetUp()
{
fd = open(TESTDATADIR "/filelock.ex1", O_RDWR|O_EXCL|O_CREAT, 0600);
ASSERT_GE(fd, 0);
ssize_t wsize = write(fd,
"This file exists in order to test "
"sbuild::file_lock locking.\n", 61);
ASSERT_EQ(wsize, 61);
lck = new sbuild::file_lock(fd);
ASSERT_NE(lck, nullptr);
}
void TearDown()
{
ASSERT_NE(lck, nullptr);
lck->unset_lock();
delete lck;
ASSERT_EQ(close(fd), 0);
ASSERT_EQ(unlink(TESTDATADIR "/filelock.ex1"), 0);
}
};
TEST_P(FileLock, Locking)
{
const FileLockParameters& params = GetParam();
lck->unset_lock();
int pid = fork();
ASSERT_GE(pid, 0);
if (pid == 0)
{
try
{
lck->set_lock(params.initial, 1);
// Note: can cause unexpected success if < 4. Set to 8 to
// allow for slow or heavily-loaded machines.
sleep(4);
lck->unset_lock();
}
catch (const std::exception& e)
{
try
{
lck->unset_lock();
}
catch (const std::exception& ignore)
{
}
std::cerr << "Child fail: " << e.what() << std::endl;
_exit(EXIT_FAILURE);
}
_exit(EXIT_SUCCESS);
}
else
{
try
{
sleep(2);
lck->set_lock(params.establish, 1);
int status;
ASSERT_GE(waitpid(pid, &status, 0), 0);
ASSERT_EQ(WIFEXITED(status) && WEXITSTATUS(status), 0);
ASSERT_FALSE(params.willthrow);
}
catch (const std::exception& e)
{
int status;
waitpid(pid, &status, 0);
ASSERT_TRUE(params.willthrow);
}
}
}
FileLockParameters params[] =
{
FileLockParameters(sbuild::lock::LOCK_NONE, sbuild::lock::LOCK_NONE, false),
FileLockParameters(sbuild::lock::LOCK_NONE, sbuild::lock::LOCK_SHARED, false),
FileLockParameters(sbuild::lock::LOCK_NONE, sbuild::lock::LOCK_EXCLUSIVE, false),
FileLockParameters(sbuild::lock::LOCK_SHARED, sbuild::lock::LOCK_NONE, false),
FileLockParameters(sbuild::lock::LOCK_SHARED, sbuild::lock::LOCK_SHARED, false),
FileLockParameters(sbuild::lock::LOCK_SHARED, sbuild::lock::LOCK_EXCLUSIVE, true),
FileLockParameters(sbuild::lock::LOCK_EXCLUSIVE, sbuild::lock::LOCK_NONE, false),
FileLockParameters(sbuild::lock::LOCK_EXCLUSIVE, sbuild::lock::LOCK_SHARED, true),
FileLockParameters(sbuild::lock::LOCK_EXCLUSIVE, sbuild::lock::LOCK_EXCLUSIVE, true)
};
INSTANTIATE_TEST_CASE_P(LockVariants, FileLock, ::testing::ValuesIn(params));
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