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

base/process/process_metrics_ios.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_metrics.h"
 
 #include <mach/task.h>
 
 namespace base {
 
@@ skipping 26 matching lines @@
   return task_info_data.virtual_size;
 }
 
 size_t ProcessMetrics::GetWorkingSetSize() const {
   task_basic_info_64 task_info_data;
   if (!GetTaskInfo(&task_info_data))
     return 0;
   return task_info_data.resident_size;
 }
 
+size_t GetMaxFds() {
+  static const rlim_t kSystemDefaultMaxFds = 256;
+  rlim_t max_fds;
+  struct rlimit nofile;
+  if (getrlimit(RLIMIT_NOFILE, &nofile)) {
+    // Error case: Take a best guess.
+    max_fds = kSystemDefaultMaxFds;
+  } else {
+    max_fds = nofile.rlim_cur;
+  }
+
+  if (max_fds > INT_MAX)
+    max_fds = INT_MAX;
+
+  return static_cast<size_t>(max_fds);
+}
+
 }  // namespace base