From f60a02e52693eab39c180ec9bf2a08b3847dca2f Mon Sep 17 00:00:00 2001
From: Zofia Abramowska <z.abramowska@samsung.com>
Date: Mon, 10 Oct 2016 16:09:07 +0200
Subject: [PATCH] SM : Add MessagePipe

Change-Id: I720056bc27c837914ed56ee36bca1512093ac4a9
---
 src/common/CMakeLists.txt   |  1 +
 src/common/message_pipe.cpp | 72 +++++++++++++++++++++++++++++++++++++++++++++
 src/common/message_pipe.h   | 59 +++++++++++++++++++++++++++++++++++++
 3 files changed, 132 insertions(+)
 create mode 100644 src/common/message_pipe.cpp
 create mode 100644 src/common/message_pipe.h

diff --git a/src/common/CMakeLists.txt b/src/common/CMakeLists.txt
index 4e1055f..4fd8953 100644
--- a/src/common/CMakeLists.txt
+++ b/src/common/CMakeLists.txt
@@ -28,6 +28,7 @@ SET(COMMON_TARGET_TEST_SOURCES
     ${PROJECT_SOURCE_DIR}/src/common/fs_label_manager.cpp
     ${PROJECT_SOURCE_DIR}/src/common/passwd_access.cpp
     ${PROJECT_SOURCE_DIR}/src/common/uds.cpp
+    ${PROJECT_SOURCE_DIR}/src/common/message_pipe.cpp
     ${PROJECT_SOURCE_DIR}/src/common/synchronization_pipe.cpp
     ${PROJECT_SOURCE_DIR}/src/common/timeout.cpp
     ${PROJECT_SOURCE_DIR}/src/common/temp_test_user.cpp
diff --git a/src/common/message_pipe.cpp b/src/common/message_pipe.cpp
new file mode 100644
index 0000000..a29ea8d
--- /dev/null
+++ b/src/common/message_pipe.cpp
@@ -0,0 +1,72 @@
+/*
+ * Copyright (c) 2016 Samsung Electronics Co., Ltd All Rights Reserved
+ *
+ *    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.
+ */
+/**
+ * @file        message_pipe.cpp
+ * @author      Zofia Abramowska
+ * @version     1.0
+ * @brief       Simple wrapper for message pipe
+ */
+
+#include "message_pipe.h"
+
+static void closeFd(int *fd) {
+    if (*fd > -1) {
+        close(*fd);
+        *fd = -1;
+    }
+}
+
+MessagePipe::MessagePipe() {
+    auto ret = pipe(m_pipeCP);
+    RUNNER_ASSERT_ERRNO_MSG(ret == 0, "pipe failed");
+
+    ret = pipe(m_pipePC);
+    RUNNER_ASSERT_ERRNO_MSG(ret == 0, "pipe failed");
+}
+
+MessagePipe::~MessagePipe() {
+    closeFd(m_pipeCP + 0);
+    closeFd(m_pipeCP + 1);
+    closeFd(m_pipePC + 0);
+    closeFd(m_pipePC + 1);
+}
+
+void MessagePipe::claimParentEp() {
+    if (m_epClaimed)
+        return;
+
+    m_readEp = m_pipeCP[0];
+    closeFd(m_pipeCP + 1);
+
+    m_writeEp = m_pipePC[1];
+    closeFd(m_pipePC + 0);
+
+    m_epClaimed = true;
+}
+
+void MessagePipe::claimChildEp() {
+    if (m_epClaimed)
+        return;
+
+    m_readEp = m_pipePC[0];
+    closeFd(m_pipePC + 1);
+
+    m_writeEp = m_pipeCP[1];
+    closeFd(m_pipeCP + 0);
+
+    m_epClaimed = true;
+}
+
diff --git a/src/common/message_pipe.h b/src/common/message_pipe.h
new file mode 100644
index 0000000..51780e9
--- /dev/null
+++ b/src/common/message_pipe.h
@@ -0,0 +1,59 @@
+/*
+ * Copyright (c) 2016 Samsung Electronics Co., Ltd All Rights Reserved
+ *
+ *    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.
+ */
+/**
+ * @file        message_pipe.h
+ * @author      Zofia Abramowska <z.abramowska@samsung.com>
+ * @version     1.0
+ * @brief       Simple message pipe wrapper
+ */
+
+#pragma once
+
+#include <unistd.h>
+
+#include <dpl/test/test_runner.h>
+
+class MessagePipe {
+public:
+    MessagePipe();
+    ~MessagePipe();
+
+    void claimParentEp();
+    void claimChildEp();
+
+    template <class T>
+    void write(const T& data) {
+        RUNNER_ASSERT_MSG(m_epClaimed == true, "Endpoint not claimed");
+        auto ret = TEMP_FAILURE_RETRY(::write(m_writeEp, &data, sizeof(data)));
+        RUNNER_ASSERT_ERRNO_MSG(ret > 0, "Write failed ret = " << ret);
+        RUNNER_ASSERT_MSG(ret == sizeof(data), "ERROR : lazy programmer didn't implement write properly");
+
+    }
+    template <class T>
+    void read(T& data) {
+        RUNNER_ASSERT_MSG(m_epClaimed == true, "Endpoint not claimed");
+        auto ret = TEMP_FAILURE_RETRY(::read(m_readEp, &data, sizeof(data)));
+        RUNNER_ASSERT_ERRNO_MSG(ret > 0, "Read failed ret = " << ret);
+        RUNNER_ASSERT_MSG(ret == sizeof(data), "ERROR : lazy programmer didn't implement read properly");
+    }
+
+private:
+    int m_pipeCP[2];    // Child -> Parent
+    int m_pipePC[2];    // Parent -> Child
+    int m_readEp = -1;
+    int m_writeEp = -1;
+    bool m_epClaimed = false;
+};
-- 
2.7.4