Implement /proc/self/maps/ parsing code.

base/debug/proc_maps.h

+// 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 BASE_DEBUG_PROC_MAPS_H_
+#define BASE_DEBUG_PROC_MAPS_H_
+
+#include <string>
+#include <vector>
+
+#include "base/base_export.h"
+#include "base/basictypes.h"
+#include "base/files/file_path.h"
+
+namespace base {
+namespace debug {
+
+#if defined(OS_LINUX) || defined(OS_ANDROID)
+
+// Describes a region of mapped memory and the path of the file mapped.
+struct MappedMemoryRegion {
+  enum Permissions {
+    READ = 1 << 0,
+    WRITE = 1 << 1,
+    EXECUTE = 1 << 2,
+    PRIVATE = 1 << 3,  // If set, region is private otherwise it is shared.
+  };
+
+  // The address range [start,end) of mapped memory.
+  uintptr_t start;
+  uintptr_t end;
+
+  // Byte offset into |path| of the range mapped into memory.
+  size_t offset;
+
+  // Bitmask of read/write/execute/private/shared permissions.
+  uint8 permissions;
+
+  // Path of the file mapped into memory.
+  FilePath path;
+};
+
+// Reads the data from /proc/self/maps. Returns an empty string if unable to
+// do so.
+BASE_EXPORT std::string ReadProcMaps();
+
+// Parses /proc/<pid>/maps input data and stores in |regions|. Returns true
+// and updates |regions| if and only if all of |input| was successfully parsed.
+//
+// NOTE: Parsed path names aren't guaranteed to point at valid files. For
+// example, "[heap]" and "[stack]" are used to represent the location of the
+// process' heap and stack, respectively.
+BASE_EXPORT bool ParseProcMaps(const std::string& input,
+                               std::vector<MappedMemoryRegion>* regions);
+
+#endif
+
+}  // namespace debug
+}  // namespace base
+
+#endif  // BASE_DEBUG_PROC_MAPS_H_