Add static Process class and improved dump output

Test: as follows
    - built, flashed, booted
    - adb shell dumpsys netd shows new output
Change-Id: Ib78dbdc982f5db747bff445db21b8408c9c407cc
diff --git a/server/Process.h b/server/Process.h
new file mode 100644
index 0000000..66c25c5
--- /dev/null
+++ b/server/Process.h
@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2018 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.
+ */
+
+#ifndef NETD_SERVER_PROCESS_H_
+#define NETD_SERVER_PROCESS_H_
+
+#include "DumpWriter.h"
+
+#include <string>
+
+namespace android {
+namespace net {
+namespace process {
+
+// Does what is says on the tin.
+void blockSigPipe();
+
+void writePidFile(const std::string& pidFile);
+void removePidFile(const std::string& pidFile);
+
+class ScopedPidFile {
+  public:
+    ScopedPidFile() = delete;
+    ScopedPidFile(const std::string& filename) : pidFile(filename) {
+        removePidFile(pidFile);
+        writePidFile(pidFile);
+    }
+    ScopedPidFile(const ScopedPidFile&) = delete;
+    ScopedPidFile(ScopedPidFile&&) = delete;
+
+    ~ScopedPidFile() {
+        removePidFile(pidFile);
+    }
+
+    ScopedPidFile& operator=(const ScopedPidFile&) = delete;
+    ScopedPidFile& operator=(ScopedPidFile&&) = delete;
+
+    const std::string pidFile;
+};
+
+void dump(DumpWriter& dw);
+
+}  // namespace process
+}  // namespace net
+}  // namespace android
+
+#endif  // NETD_SERVER_PROCESS_H_