Split ProcessHandle and its related routines into base/process/process_handle.h.

base/process/process_handle_posix.cc

+// 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.
+
+#include "base/process/process_handle.h"
+
+#include <unistd.h>
+
+namespace base {
+
+ProcessId GetCurrentProcId() {
+  return getpid();
+}
+
+ProcessHandle GetCurrentProcessHandle() {
+  return GetCurrentProcId();
+}
+
+bool OpenProcessHandle(ProcessId pid, ProcessHandle* handle) {
+  // On Posix platforms, process handles are the same as PIDs, so we
+  // don't need to do anything.
+  *handle = pid;
+  return true;
+}
+
+bool OpenPrivilegedProcessHandle(ProcessId pid, ProcessHandle* handle) {
+  // On POSIX permissions are checked for each operation on process,
+  // not when opening a "handle".
+  return OpenProcessHandle(pid, handle);
+}
+
+bool OpenProcessHandleWithAccess(ProcessId pid,
+                                 uint32 access_flags,
+                                 ProcessHandle* handle) {
+  // On POSIX permissions are checked for each operation on process,
+  // not when opening a "handle".
+  return OpenProcessHandle(pid, handle);
+}
+
+void CloseProcessHandle(ProcessHandle process) {
+  // See OpenProcessHandle, nothing to do.
+  return;
+}
+
+ProcessId GetProcId(ProcessHandle process) {
+  return process;
+}
+
+}  // namespace base