Implement CurrentProcessInfo::CreationTime() for Linux.

base/process/process_info_linux.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_info.h"
+
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "base/file_util.h"
+#include "base/files/file_path.h"
+#include "base/platform_file.h"
+#include "base/strings/stringprintf.h"
+#include "base/threading/thread_restrictions.h"
+#include "base/time/time.h"
+
+using base::Time;
+
+namespace {
+
+// Returns the process creation time, or NULL if an error occurred.
+Time* ProcessCreationTimeInternal() {
+  const base::FilePath pid_path(base::StringPrintf("/proc/%d", getpid()));
+  base::PlatformFileInfo file_info;
+
+  {
+    base::ThreadRestrictions::ScopedAllowIO nonblocking_stat_of_proc_subdir;
+    if (!file_util::GetFileInfo(pid_path, &file_info))

[darin (slow to review), 2013/08/07 22:30:34]

maybe the code that complains about GetFileInfo being called on a UI thread
should avoid complaining about paths under /proc?  then others wouldn't need the
same workaround?

+      return NULL;
+  }
+
+  return new Time(file_info.creation_time);
+}
+
+}  // namespace
+
+namespace base {
+
+// static
+const Time* CurrentProcessInfo::CreationTime() {
+  static Time* process_creation_time = ProcessCreationTimeInternal();
+  return process_creation_time;
+}
+
+}  // namespace base