import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

hal/linux/LinuxMemory.cpp

@@ -0,0 +1,39 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: sw=2 ts=8 et :
+ */
+/* 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 <stdio.h>
+#include "Hal.h"
+
+namespace mozilla {
+namespace hal_impl {
+
+uint32_t
+GetTotalSystemMemory()
+{
+  static uint32_t sTotalMemory;
+  static bool sTotalMemoryObtained = false;
+
+  if (!sTotalMemoryObtained) {
+    sTotalMemoryObtained = true;
+
+    FILE* fd = fopen("/proc/meminfo", "r");
+    if (!fd) {
+      return 0;
+    }
+
+    int rv = fscanf(fd, "MemTotal: %i kB", &sTotalMemory);
+
+    if (fclose(fd) || rv != 1) {
+      return 0;
+    }
+  }
+
+  return sTotalMemory * 1024;
+}
+
+} // namespace hal_impl
+} // namespace mozilla