Abstract native file-locking and directory detection/creation to portable classes LockFile and FileSysDir; resolves QPID-1148

git-svn-id: https://svn.apache.org/repos/asf/incubator/qpid/trunk/qpid@702513 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 83 insertions, 0 deletions

diff --git a/cpp/src/qpid/sys/windows/LockFile.cpp b/cpp/src/qpid/sys/windows/LockFile.cpp
new file mode 100755
index 0000000000..9804020167
--- /dev/null
+++ b/cpp/src/qpid/sys/windows/LockFile.cpp
@@ -0,0 +1,83 @@
+/*
+ *
+ * Copyright (c) 2008 The Apache Software Foundation
+ *
+ * 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 "qpid/sys/LockFile.h"
+#include "check.h"
+
+#include <windows.h>
+
+namespace qpid {
+namespace sys {
+
+class LockFilePrivate {
+    friend class LockFile;
+
+    HANDLE fd;
+
+public:
+    LockFilePrivate(HANDLE f) : fd(f) {}
+};
+
+LockFile::LockFile(const std::string& path_, bool create)
+  : path(path_), created(create) {
+
+    HANDLE h = CreateFile(path.c_str(),
+                          GENERIC_READ|GENERIC_WRITE,
+                          0, /* Disable opens by any other attempter */
+                          0, /* Default security */
+                          OPEN_ALWAYS, /* Create if needed */
+                          FILE_FLAG_DELETE_ON_CLOSE, /* Delete file when closed */
+                          NULL);
+    QPID_WINDOWS_CHECK_NOT(h, INVALID_HANDLE_VALUE);
+    impl.reset(new LockFilePrivate(h));
+}
+
+LockFile::~LockFile() {
+    if (impl) {
+        if (impl->fd != INVALID_HANDLE_VALUE) {
+            CloseHandle(impl->fd);
+        }
+    }
+}
+
+pid_t LockFile::readPid(void) const {
+    if (!impl)
+        throw Exception("Lock file not open");
+
+    pid_t pid;
+    DWORD desired_read = sizeof(pid_t);
+    DWORD actual_read = 0;
+    if (!ReadFile(impl->fd, &pid, desired_read, &actual_read, 0)) {
+        throw Exception("Cannot read lock file " + path);
+    }
+    return pid;
+}
+
+void LockFile::writePid(void) {
+    if (!impl)
+        throw Exception("Lock file not open");
+
+    pid_t pid = GetCurrentProcessId();
+    DWORD desired_write = sizeof(pid_t);
+    DWORD written = 0;
+    if (!WriteFile(impl->fd, &pid, desired_write, &written, 0)) {
+        throw Exception("Cannot write lock file " + path);
+    }
+}
+ 
+}}  /* namespace qpid::sys */