implement GetProcessExecutablePath() on OpenBSD and start using it

base/process_util.h

 // Copyright (c) 2011 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.
 
 // This file/namespace contains utility functions for enumerating, ending and
 // computing statistics of processes.
 
 #ifndef BASE_PROCESS_UTIL_H_
 #define BASE_PROCESS_UTIL_H_
 #pragma once
@@ skipping 148 matching lines @@
                                              ProcessHandle* handle);
 
 // Closes the process handle opened by OpenProcessHandle.
 BASE_EXPORT void CloseProcessHandle(ProcessHandle process);
 
 // Returns the unique ID for the specified process. This is functionally the
 // same as Windows' GetProcessId(), but works on versions of Windows before
 // Win XP SP1 as well.
 BASE_EXPORT ProcessId GetProcId(ProcessHandle process);
 
-#if defined(OS_LINUX) || defined(OS_ANDROID)
+#if defined(OS_LINUX) || defined(OS_ANDROID) || defined(OS_OPENBSD)
 // Returns the path to the executable of the given process.
 BASE_EXPORT FilePath GetProcessExecutablePath(ProcessHandle process);
+#endif
 
+#if defined(OS_LINUX) || defined(OS_ANDROID)
 // Parse the data found in /proc/<pid>/stat and return the sum of the
 // CPU-related ticks.  Returns -1 on parse error.
 // Exposed for testing.
 BASE_EXPORT int ParseProcStatCPU(const std::string& input);
 
 // The maximum allowed value for the OOM score.
 const int kMaxOomScore = 1000;
 
 // This adjusts /proc/<pid>/oom_score_adj so the Linux OOM killer will
 // prefer to kill certain process types over others. The range for the
@@ skipping 591 matching lines @@
 // instance running inside the parent.  The parent's Breakpad instance should
 // not handle the child's exceptions.  Calling RestoreDefaultExceptionHandler
 // in the child after forking will restore the standard exception handler.
 // See http://crbug.com/20371/ for more details.
 void RestoreDefaultExceptionHandler();
 #endif  // defined(OS_MACOSX)
 
 }  // namespace base
 
 #endif  // BASE_PROCESS_UTIL_H_