13 files changed, 2648 insertions, 0 deletions

diff --git a/src/lib/log/interprocess/Makefile.am b/src/lib/log/interprocess/Makefile.am
new file mode 100644
index 0000000..676af42
--- /dev/null
+++ b/src/lib/log/interprocess/Makefile.am
@@ -0,0 +1,21 @@
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diff --git a/src/lib/log/interprocess/Makefile.in b/src/lib/log/interprocess/Makefile.in
new file mode 100644
index 0000000..95c3b6e
--- /dev/null
+++ b/src/lib/log/interprocess/Makefile.in
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diff --git a/src/lib/log/interprocess/README b/src/lib/log/interprocess/README
new file mode 100644
index 0000000..6f48dc6
--- /dev/null
+++ b/src/lib/log/interprocess/README
@@ -0,0 +1,13 @@
+The files in this directory implement a helper sub-library of the
+inter process locking for the log library.  We use our own locks
+because such locks are only available in relatively recent versions of
+log4cplus.  Also (against our usual practice) we somehow re-invented
+an in-house version of such a general purpose library rather than
+existing proven tools such as boost::interprocess.  While we decided
+to go with the in-house version for the log library at least until we
+completely switch to log4cplus's native lock support, no other BIND 10
+module should use this; they should use existing external
+tools/libraries.
+
+This sub-library is therefore "hidden" here.  As such, none of these
+files should be installed.
diff --git a/src/lib/log/interprocess/interprocess_sync.h b/src/lib/log/interprocess/interprocess_sync.h
new file mode 100644
index 0000000..0692ee1
--- /dev/null
+++ b/src/lib/log/interprocess/interprocess_sync.h
@@ -0,0 +1,143 @@
+// Copyright (C) 2012-2015 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef INTERPROCESS_SYNC_H
+#define INTERPROCESS_SYNC_H
+
+#include <string>
+
+namespace isc {
+namespace log {
+namespace interprocess {
+
+class InterprocessSyncLocker; // forward declaration
+
+/// \brief Interprocess Sync Class
+///
+/// This class specifies an interface for mutual exclusion among
+/// co-operating processes. This is an abstract class and a real
+/// implementation such as InterprocessSyncFile should be used
+/// in code. Usage is as follows:
+///
+/// 1. Client instantiates a sync object of an implementation (such as
+/// InterprocessSyncFile).
+/// 2. Client then creates an automatic (stack) object of
+/// InterprocessSyncLocker around the sync object. Such an object
+/// destroys itself and releases any acquired lock when it goes out of extent.
+/// 3. Client calls lock() method on the InterprocessSyncLocker.
+/// 4. Client performs task that needs mutual exclusion.
+/// 5. Client frees lock with unlock(), or simply returns from the basic
+/// block which forms the scope for the InterprocessSyncLocker.
+///
+/// NOTE: All implementations of InterprocessSync should keep the
+/// is_locked_ member variable updated whenever their
+/// lock()/tryLock()/unlock() implementations are called.
+class InterprocessSync {
+  // InterprocessSyncLocker is the only code outside this class that
+  // should be allowed to call the lock(), tryLock() and unlock()
+  // methods.
+  friend class InterprocessSyncLocker;
+
+public:
+    /// \brief Constructor
+    ///
+    /// Creates an interprocess synchronization object
+    ///
+    /// \param task_name Name of the synchronization task. This has to be
+    /// identical among the various processes that need to be
+    /// synchronized for the same task.
+    InterprocessSync(const std::string& task_name) :
+        task_name_(task_name), is_locked_(false)
+    {}
+
+    /// \brief Destructor
+    virtual ~InterprocessSync() {}
+
+protected:
+    /// \brief Acquire the lock (blocks if something else has acquired a
+    /// lock on the same task name)
+    ///
+    /// \return Returns true if the lock was acquired, false otherwise.
+    virtual bool lock() = 0;
+
+    /// \brief Try to acquire a lock (doesn't block)
+    ///
+    /// \return Returns true if the lock was acquired, false otherwise.
+    virtual bool tryLock() = 0;
+
+    /// \brief Release the lock
+    ///
+    /// \return Returns true if the lock was released, false otherwise.
+    virtual bool unlock() = 0;
+
+    const std::string task_name_; ///< The task name
+    bool is_locked_;              ///< Is the lock taken?
+};
+
+/// \brief Interprocess Sync Locker Class
+///
+/// This class is used for making automatic stack objects to manage
+/// locks that are released automatically when the block is exited
+/// (RAII). It is meant to be used along with InterprocessSync objects. See
+/// the description of InterprocessSync.
+class InterprocessSyncLocker {
+public:
+    /// \brief Constructor
+    ///
+    /// Creates a lock manager around a interprocess synchronization object
+    ///
+    /// \param sync The sync object which has to be locked/unlocked by
+    /// this locker object.
+    InterprocessSyncLocker(InterprocessSync& sync) :
+        sync_(sync)
+    {}
+
+    /// \brief Destructor
+    ~InterprocessSyncLocker() {
+        if (isLocked())
+            unlock();
+    }
+
+    /// \brief Acquire the lock (blocks if something else has acquired a
+    /// lock on the same task name)
+    ///
+    /// \return Returns true if the lock was acquired, false otherwise.
+    bool lock() {
+        return (sync_.lock());
+    }
+
+    /// \brief Try to acquire a lock (doesn't block)
+    ///
+    /// \return Returns true if a new lock could be acquired, false
+    ///         otherwise.
+    bool tryLock() {
+        return (sync_.tryLock());
+    }
+
+    /// \brief Check if the lock is taken
+    ///
+    /// \return Returns true if a lock is currently acquired, false
+    ///         otherwise.
+    bool isLocked() const {
+        return (sync_.is_locked_);
+    }
+
+    /// \brief Release the lock
+    ///
+    /// \return Returns true if the lock was released, false otherwise.
+    bool unlock() {
+        return (sync_.unlock());
+    }
+
+protected:
+    InterprocessSync& sync_; ///< Ref to underlying sync object
+};
+
+} // namespace interprocess
+} // namespace log
+} // namespace isc
+
+#endif // INTERPROCESS_SYNC_H
diff --git a/src/lib/log/interprocess/interprocess_sync_file.cc b/src/lib/log/interprocess/interprocess_sync_file.cc
new file mode 100644
index 0000000..ed6a5b7
--- /dev/null
+++ b/src/lib/log/interprocess/interprocess_sync_file.cc
@@ -0,0 +1,132 @@
+// Copyright (C) 2012-2015 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+// This file requires LOCKFILE_DIR to be defined. It points to the default
+// directory where lockfile will be created.
+
+#include <config.h>
+
+#include <log/interprocess/interprocess_sync_file.h>
+
+#include <string>
+#include <cerrno>
+#include <cstring>
+#include <sstream>
+#include <iostream>
+
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+namespace isc {
+namespace log {
+namespace interprocess {
+
+InterprocessSyncFile::~InterprocessSyncFile() {
+    if (fd_ != -1) {
+        // This will also release any applied locks.
+        close(fd_);
+        // The lockfile will continue to exist, and we must not delete
+        // it.
+    }
+}
+
+bool
+InterprocessSyncFile::do_lock(int cmd, short l_type) {
+    // Open lock file only when necessary (i.e., here). This is so that
+    // if a default InterprocessSync object is replaced with another
+    // implementation, it doesn't attempt any opens.
+    if (fd_ == -1) {
+        std::string lockfile_path = LOCKFILE_DIR;
+
+        const char* const env = getenv("KEA_LOCKFILE_DIR");
+        if (env != NULL) {
+            lockfile_path = env;
+        }
+
+        lockfile_path += "/" + task_name_ + "_lockfile";
+
+        // Open the lockfile in the constructor so it doesn't do the access
+        // checks every time a message is logged.
+        const mode_t mode = umask(S_IXUSR | S_IXGRP | S_IXOTH); // 0111
+        fd_ = open(lockfile_path.c_str(), O_CREAT | O_RDWR,
+                   S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); // 0660
+        umask(mode);
+
+        if (fd_ == -1) {
+            std::stringstream tmp;
+
+            // We failed to create a lockfile. This means that the logging
+            // system is unusable. We need to report the issue using plain
+            // print to stderr.
+            tmp << "Unable to use interprocess sync lockfile ("
+                << std::strerror(errno) << "): " << lockfile_path;
+            std::cerr << tmp.str() << std::endl;
+
+            // And then throw exception as usual.
+            isc_throw(InterprocessSyncFileError, tmp.str());
+        }
+    }
+
+    struct flock lock;
+
+    memset(&lock, 0, sizeof (lock));
+    lock.l_type = l_type;
+    lock.l_whence = SEEK_SET;
+    lock.l_start = 0;
+    lock.l_len = 1;
+
+    return (fcntl(fd_, cmd, &lock) == 0);
+}
+
+bool
+InterprocessSyncFile::lock() {
+    if (is_locked_) {
+        return (true);
+    }
+
+    if (do_lock(F_SETLKW, F_WRLCK)) {
+        is_locked_ = true;
+        return (true);
+    }
+
+    return (false);
+}
+
+bool
+InterprocessSyncFile::tryLock() {
+    if (is_locked_) {
+        return (true);
+    }
+
+    if (do_lock(F_SETLK, F_WRLCK)) {
+        is_locked_ = true;
+        return (true);
+    }
+
+    return (false);
+}
+
+bool
+InterprocessSyncFile::unlock() {
+    if (!is_locked_) {
+        return (true);
+    }
+
+    if (do_lock(F_SETLKW, F_UNLCK)) {
+        is_locked_ = false;
+        return (true);
+    }
+
+    return (false);
+}
+
+} // namespace interprocess
+} // namespace log
+} // namespace isc
diff --git a/src/lib/log/interprocess/interprocess_sync_file.h b/src/lib/log/interprocess/interprocess_sync_file.h
new file mode 100644
index 0000000..9613e7f
--- /dev/null
+++ b/src/lib/log/interprocess/interprocess_sync_file.h
@@ -0,0 +1,85 @@
+// Copyright (C) 2012-2015 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef INTERPROCESS_SYNC_FILE_H
+#define INTERPROCESS_SYNC_FILE_H
+
+#include <log/interprocess/interprocess_sync.h>
+#include <exceptions/exceptions.h>
+
+namespace isc {
+namespace log {
+namespace interprocess {
+
+/// \brief InterprocessSyncFileError
+///
+/// Exception that is thrown if it's not possible to open the
+/// lock file.
+class InterprocessSyncFileError : public Exception {
+public:
+    InterprocessSyncFileError(const char* file, size_t line,
+                              const char* what) :
+        isc::Exception(file, line, what) {}
+};
+
+/// \brief File-based Interprocess Sync Class
+///
+/// This class specifies a concrete implementation for a file-based
+/// interprocess synchronization mechanism. Please see the
+/// InterprocessSync class documentation for usage.
+///
+/// An InterprocessSyncFileError exception may be thrown if there is an
+/// issue opening the lock file.
+///
+/// Lock files are created typically in the local state directory
+/// (var). They are typically named like "<task_name>_lockfile".
+/// This implementation opens lock files lazily (only when
+/// necessary). It also leaves the lock files lying around as multiple
+/// processes may have locks on them.
+class InterprocessSyncFile : public InterprocessSync {
+public:
+    /// \brief Constructor
+    ///
+    /// Creates a file-based interprocess synchronization object
+    ///
+    /// \param task_name Name of the synchronization task. This has to be
+    /// identical among the various processes that need to be
+    /// synchronized for the same task.
+    InterprocessSyncFile(const std::string& task_name) :
+        InterprocessSync(task_name), fd_(-1)
+    {}
+
+    /// \brief Destructor
+    virtual ~InterprocessSyncFile();
+
+protected:
+    /// \brief Acquire the lock (blocks if something else has acquired a
+    /// lock on the same task name)
+    ///
+    /// \return Returns true if the lock was acquired, false otherwise.
+    bool lock();
+
+    /// \brief Try to acquire a lock (doesn't block)
+    ///
+    /// \return Returns true if the lock was acquired, false otherwise.
+    bool tryLock();
+
+    /// \brief Release the lock
+    ///
+    /// \return Returns true if the lock was released, false otherwise.
+    bool unlock();
+
+private:
+    bool do_lock(int cmd, short l_type);
+
+    int fd_; ///< The descriptor for the open file
+};
+
+} // namespace interprocess
+} // namespace log
+} // namespace isc
+
+#endif // INTERPROCESS_SYNC_FILE_H
diff --git a/src/lib/log/interprocess/interprocess_sync_null.cc b/src/lib/log/interprocess/interprocess_sync_null.cc
new file mode 100644
index 0000000..ccd9e32
--- /dev/null
+++ b/src/lib/log/interprocess/interprocess_sync_null.cc
@@ -0,0 +1,38 @@
+// Copyright (C) 2012-2015 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <log/interprocess/interprocess_sync_null.h>
+
+namespace isc {
+namespace log {
+namespace interprocess {
+
+InterprocessSyncNull::~InterprocessSyncNull() {
+}
+
+bool
+InterprocessSyncNull::lock() {
+    is_locked_ = true;
+    return (true);
+}
+
+bool
+InterprocessSyncNull::tryLock() {
+    is_locked_ = true;
+    return (true);
+}
+
+bool
+InterprocessSyncNull::unlock() {
+    is_locked_ = false;
+    return (true);
+}
+
+} // namespace interprocess
+} // namespace log
+} // namespace isc
diff --git a/src/lib/log/interprocess/interprocess_sync_null.h b/src/lib/log/interprocess/interprocess_sync_null.h
new file mode 100644
index 0000000..8b0c57b
--- /dev/null
+++ b/src/lib/log/interprocess/interprocess_sync_null.h
@@ -0,0 +1,58 @@
+// Copyright (C) 2012-2015 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef INTERPROCESS_SYNC_NULL_H
+#define INTERPROCESS_SYNC_NULL_H
+
+#include <log/interprocess/interprocess_sync.h>
+
+namespace isc {
+namespace log {
+namespace interprocess {
+
+/// \brief Null Interprocess Sync Class
+///
+/// This class specifies a concrete implementation for a null (no effect)
+/// interprocess synchronization mechanism. Please see the
+/// InterprocessSync class documentation for usage.
+class InterprocessSyncNull : public InterprocessSync {
+public:
+    /// \brief Constructor
+    ///
+    /// Creates a null interprocess synchronization object
+    ///
+    /// \param task_name Name of the synchronization task. This has to be
+    /// identical among the various processes that need to be
+    /// synchronized for the same task.
+    InterprocessSyncNull(const std::string& task_name) :
+        InterprocessSync(task_name)
+    {}
+
+    /// \brief Destructor
+    virtual ~InterprocessSyncNull();
+
+protected:
+    /// \brief Acquire the lock (never blocks)
+    ///
+    /// \return Always returns true
+    bool lock();
+
+    /// \brief Try to acquire a lock (doesn't block)
+    ///
+    /// \return Always returns true
+    bool tryLock();
+
+    /// \brief Release the lock
+    ///
+    /// \return Always returns true
+    bool unlock();
+};
+
+} // namespace interprocess
+} // namespace log
+} // namespace isc
+
+#endif // INTERPROCESS_SYNC_NULL_H
diff --git a/src/lib/log/interprocess/tests/Makefile.am b/src/lib/log/interprocess/tests/Makefile.am
new file mode 100644
index 0000000..a51a4b3
--- /dev/null
+++ b/src/lib/log/interprocess/tests/Makefile.am
@@ -0,0 +1,36 @@
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+
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+AM_CPPFLAGS += $(BOOST_INCLUDES)
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+AM_CXXFLAGS = $(KEA_CXXFLAGS)
+
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+AM_LDFLAGS = -static
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+
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+
+TESTS =
+if HAVE_GTEST
+TESTS += run_unittests
+run_unittests_SOURCES  = run_unittests.cc
+run_unittests_SOURCES += interprocess_sync_file_unittest.cc
+run_unittests_SOURCES += interprocess_sync_null_unittest.cc
+
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+run_unittests_LDADD += $(GTEST_LDADD)
+endif
+
+noinst_PROGRAMS = $(TESTS)
diff --git a/src/lib/log/interprocess/tests/Makefile.in b/src/lib/log/interprocess/tests/Makefile.in
new file mode 100644
index 0000000..dcbb165
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diff --git a/src/lib/log/interprocess/tests/interprocess_sync_file_unittest.cc b/src/lib/log/interprocess/tests/interprocess_sync_file_unittest.cc
new file mode 100644
index 0000000..d80f288
--- /dev/null
+++ b/src/lib/log/interprocess/tests/interprocess_sync_file_unittest.cc
@@ -0,0 +1,153 @@
+// Copyright (C) 2012-2015,2017 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <log/interprocess/interprocess_sync_file.h>
+
+#include <util/unittests/check_valgrind.h>
+#include <util/unittests/interprocess_util.h>
+#include <gtest/gtest.h>
+#include <unistd.h>
+
+using namespace std;
+using namespace isc::log::interprocess;
+using isc::util::unittests::parentReadState;
+
+namespace {
+TEST(InterprocessSyncFileTest, BadFile) {
+    InterprocessSyncFile sync("/no-such--dir/or--file");
+    InterprocessSyncLocker locker(sync);
+
+    EXPECT_FALSE(locker.isLocked());
+    ASSERT_THROW(locker.lock(), InterprocessSyncFileError);
+}
+
+TEST(InterprocessSyncFileTest, TestLock) {
+    InterprocessSyncFile sync("test");
+    InterprocessSyncLocker locker(sync);
+
+    EXPECT_FALSE(locker.isLocked());
+    EXPECT_TRUE(locker.lock());
+    EXPECT_TRUE(locker.isLocked());
+
+    if (!isc::util::unittests::runningOnValgrind()) {
+
+        int fds[2];
+
+        // Here, we check that a lock has been taken by forking and
+        // checking from the child that a lock exists. This has to be
+        // done from a separate process as we test by trying to lock the
+        // range again on the lock file. The lock attempt would pass if
+        // done from the same process for the granted range. The lock
+        // attempt must fail to pass our check.
+
+        EXPECT_EQ(0, pipe(fds));
+
+        if (fork() == 0) {
+            unsigned char locked = 0;
+            // Child writes to pipe
+            close(fds[0]);
+
+            InterprocessSyncFile sync2("test");
+            InterprocessSyncLocker locker2(sync2);
+
+            if (!locker2.tryLock()) {
+                EXPECT_FALSE(locker2.isLocked());
+                locked = 1;
+            } else {
+                EXPECT_TRUE(locker2.isLocked());
+            }
+
+            ssize_t bytes_written = write(fds[1], &locked, sizeof(locked));
+            EXPECT_EQ(sizeof(locked), bytes_written);
+
+            close(fds[1]);
+            exit(0);
+        } else {
+            // Parent reads from pipe
+            close(fds[1]);
+
+            const unsigned char locked = parentReadState(fds[0]);
+
+            close(fds[0]);
+
+            EXPECT_EQ(1, locked);
+        }
+    }
+
+    EXPECT_TRUE(locker.unlock());
+    EXPECT_FALSE(locker.isLocked());
+
+    EXPECT_EQ (0, remove(TEST_DATA_TOPBUILDDIR "/test_lockfile"));
+}
+
+TEST(InterprocessSyncFileTest, TestMultipleFilesDirect) {
+  InterprocessSyncFile sync("test1");
+  InterprocessSyncLocker locker(sync);
+
+  EXPECT_TRUE(locker.lock());
+
+  InterprocessSyncFile sync2("test2");
+  InterprocessSyncLocker locker2(sync2);
+  EXPECT_TRUE(locker2.lock());
+  EXPECT_TRUE(locker2.unlock());
+
+  EXPECT_TRUE(locker.unlock());
+
+  EXPECT_EQ (0, remove(TEST_DATA_TOPBUILDDIR "/test1_lockfile"));
+  EXPECT_EQ (0, remove(TEST_DATA_TOPBUILDDIR "/test2_lockfile"));
+}
+
+TEST(InterprocessSyncFileTest, TestMultipleFilesForked) {
+    InterprocessSyncFile sync("test1");
+    InterprocessSyncLocker locker(sync);
+
+    EXPECT_TRUE(locker.lock());
+
+    if (!isc::util::unittests::runningOnValgrind()) {
+
+        int fds[2];
+
+        EXPECT_EQ(0, pipe(fds));
+
+        if (fork() == 0) {
+            unsigned char locked = 0xff;
+            // Child writes to pipe
+            close(fds[0]);
+
+            InterprocessSyncFile sync2("test2");
+            InterprocessSyncLocker locker2(sync2);
+
+            if (locker2.tryLock()) {
+                locked = 0;
+            }
+
+            ssize_t bytes_written = write(fds[1], &locked, sizeof(locked));
+            EXPECT_EQ(sizeof(locked), bytes_written);
+
+            close(fds[1]);
+            exit(0);
+        } else {
+            // Parent reads from pipe
+            close(fds[1]);
+
+            const unsigned char locked = parentReadState(fds[0]);
+
+            close(fds[0]);
+
+            EXPECT_EQ(0, locked);
+        }
+
+        EXPECT_EQ (0, remove(TEST_DATA_TOPBUILDDIR "/test2_lockfile"));
+    }
+
+    EXPECT_TRUE(locker.unlock());
+
+    EXPECT_EQ (0, remove(TEST_DATA_TOPBUILDDIR "/test1_lockfile"));
+}
+
+} // unnamed namespace
diff --git a/src/lib/log/interprocess/tests/interprocess_sync_null_unittest.cc b/src/lib/log/interprocess/tests/interprocess_sync_null_unittest.cc
new file mode 100644
index 0000000..4f12e37
--- /dev/null
+++ b/src/lib/log/interprocess/tests/interprocess_sync_null_unittest.cc
@@ -0,0 +1,69 @@
+// Copyright (C) 2012-2015 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <log/interprocess/interprocess_sync_null.h>
+#include <gtest/gtest.h>
+
+using namespace std;
+using namespace isc::log::interprocess;
+
+namespace {
+
+TEST(InterprocessSyncNullTest, TestNull) {
+  InterprocessSyncNull sync("test1");
+  InterprocessSyncLocker locker(sync);
+
+  // Check if the is_locked_ flag is set correctly during lock().
+  EXPECT_FALSE(locker.isLocked());
+  EXPECT_TRUE(locker.lock());
+  EXPECT_TRUE(locker.isLocked());
+
+  // lock() must always return true (this is called 4 times, just an
+  // arbitrary number)
+  EXPECT_TRUE(locker.lock());
+  EXPECT_TRUE(locker.lock());
+  EXPECT_TRUE(locker.lock());
+  EXPECT_TRUE(locker.lock());
+
+  // Check if the is_locked_ flag is set correctly during unlock().
+  EXPECT_TRUE(locker.isLocked());
+  EXPECT_TRUE(locker.unlock());
+  EXPECT_FALSE(locker.isLocked());
+
+  // unlock() must always return true (this is called 4 times, just an
+  // arbitrary number)
+  EXPECT_TRUE(locker.unlock());
+  EXPECT_TRUE(locker.unlock());
+  EXPECT_TRUE(locker.unlock());
+  EXPECT_TRUE(locker.unlock());
+
+  // Check if the is_locked_ flag is set correctly during tryLock().
+  EXPECT_FALSE(locker.isLocked());
+  EXPECT_TRUE(locker.tryLock());
+  EXPECT_TRUE(locker.isLocked());
+
+  // tryLock() must always return true (this is called 4 times, just an
+  // arbitrary number)
+  EXPECT_TRUE(locker.tryLock());
+  EXPECT_TRUE(locker.tryLock());
+  EXPECT_TRUE(locker.tryLock());
+  EXPECT_TRUE(locker.tryLock());
+
+  // Random order (should all return true)
+  EXPECT_TRUE(locker.unlock());
+  EXPECT_TRUE(locker.lock());
+  EXPECT_TRUE(locker.tryLock());
+  EXPECT_TRUE(locker.lock());
+  EXPECT_TRUE(locker.unlock());
+  EXPECT_TRUE(locker.lock());
+  EXPECT_TRUE(locker.tryLock());
+  EXPECT_TRUE(locker.unlock());
+  EXPECT_TRUE(locker.unlock());
+}
+
+}
diff --git a/src/lib/log/interprocess/tests/run_unittests.cc b/src/lib/log/interprocess/tests/run_unittests.cc
new file mode 100644
index 0000000..0a12720
--- /dev/null
+++ b/src/lib/log/interprocess/tests/run_unittests.cc
@@ -0,0 +1,22 @@
+// Copyright (C) 2013-2017 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <gtest/gtest.h>
+#include <util/unittests/run_all.h>
+#include <stdlib.h>
+
+// This file uses TEST_DATA_TOPBUILDDIR macro, which must point to a writable
+// directory. It will be used for creating a logger lockfile.
+
+int
+main(int argc, char* argv[]) {
+    ::testing::InitGoogleTest(&argc, argv);
+
+    setenv("KEA_LOCKFILE_DIR", TEST_DATA_TOPBUILDDIR, 1);
+    return (isc::util::unittests::run_all());
+}