Android: Add chrome-specific dynamic linker.

third_party/crazy_linker/crazy_linker/src/crazy_linker_system.h

Index: third_party/crazy_linker/crazy_linker/src/crazy_linker_system.h
diff --git a/third_party/crazy_linker/crazy_linker/src/crazy_linker_system.h b/third_party/crazy_linker/crazy_linker/src/crazy_linker_system.h
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index 0000000000000000000000000000000000000000..b4cd0d3f752c5735bd2126ed1949a5d204eededd
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+++ b/third_party/crazy_linker/crazy_linker/src/crazy_linker_system.h
@@ -0,0 +1,86 @@
+// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CRAZY_LINKER_SYSTEM_H
+#define CRAZY_LINKER_SYSTEM_H
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/mman.h>
+#include <unistd.h>
+
+#include "crazy_linker_util.h"  // for String
+
+// System abstraction used by the crazy linker.
+// This is used to make unit testing easier without using tons of
+// dependency injection in the rest of the code base.
+//
+// In a nutshell: in a normal build, this will wrap normal open() / read()
+// calls. During unit testing, everything is mocked, see
+// crazy_linker_system_mock.cpp
+
+namespace crazy {
+
+enum FileOpenMode {
+  FILE_OPEN_READ_ONLY = 0,
+  FILE_OPEN_READ_WRITE,
+  FILE_OPEN_WRITE
+};
+
+// Scoping file descriptor class.
+class FileDescriptor {
+public:
+#ifdef UNIT_TESTS
+#  define kEmptyFD NULL
+  typedef void* HandleType;
+#else
+#  define kEmptyFD (-1)
+  typedef int HandleType;
+#endif
+
+  FileDescriptor() : fd_(kEmptyFD) {}
+
+  FileDescriptor(const char* path) : fd_(kEmptyFD) {
+    OpenReadOnly(path);
+  }
+
+  ~FileDescriptor() {
+    Close();
+  }
+
+  bool IsOk() const { return fd_ != kEmptyFD; }
+  HandleType Get() const { return fd_; }
+  bool OpenReadOnly(const char* path);
+  bool OpenReadWrite(const char* path);
+  int Read(void* buffer, size_t buffer_size);
+  int SeekTo(off_t offset);
+  void* Map(void* address, size_t length, int prot_flags,
+            int flags, off_t offset);
+  void Close();
+
+private:
+  HandleType fd_;
+};
+
+// Returns true iff a given file path exists.
+bool PathExists(const char* path_name);
+
+// Returns true iff a given path is a regular file (or link to a regular
+// file).
+bool PathIsFile(const char* path_name);
+
+// Returns the current directory, as a string.
+String GetCurrentDirectory();
+
+// Returns the value of a given environment variable.
+const char* GetEnv(const char* var_name);
+
+// Returns true iff |lib_name| corresponds to one of the NDK-exposed
+// system libraries.
+bool IsSystemLibrary(const char* lib_name);
+
+}  // namespace crazy
+
+#endif  // CRAZY_LINKER_SYSTEM_H