Add utility classes (Slice, Fd, Status, etc)

Test: as follows
    - built
    - flashed
    - bootedt log
    - netdutils_test passes
    - unsubmitted NFLogListenerTest passes
Bug: 28806131

Change-Id: I17846a0dee1edca55df10e5464e607109d978cb5

1 files changed, 36 insertions, 0 deletions

diff --git a/libnetdutils/Status.cpp b/libnetdutils/Status.cpp
new file mode 100644
index 000000000..9df2367e1
--- /dev/null
+++ b/libnetdutils/Status.cpp
@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2017 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 "netdutils/Status.h"
+#include "android-base/stringprintf.h"
+
+namespace android {
+namespace netdutils {
+
+void expectOk(const Status) {
+    // TODO: put something here, for now this function serves solely as documentation.
+}
+
+Status statusFromErrno(int err, const std::string& msg) {
+    return Status(err, base::StringPrintf("%d : [%s] : %s", err, strerror(err), msg.c_str()));
+}
+
+std::ostream& operator<<(std::ostream& os, const Status& s) {
+    return os << "Status[code: " << s.code() << ", msg: " << s.msg() << "]";
+}
+
+}  // namespace netdutils
+}  // namespace android