Provide nanoseconds precision for base::PlatformFileInfo on POSIX

base/file_util_posix.cc

 // Copyright (c) 2012 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/file_util.h"
 
 #include <dirent.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <fnmatch.h>
@@ skipping 570 matching lines @@
   else
     return false;
 }
 
 bool GetFileInfo(const FilePath& file_path, base::PlatformFileInfo* results) {
   stat_wrapper_t file_info;
   if (CallStat(file_path.value().c_str(), &file_info) != 0)
     return false;
   results->is_directory = S_ISDIR(file_info.st_mode);
   results->size = file_info.st_size;
-  results->last_modified = base::Time::FromTimeT(file_info.st_mtime);
-  results->last_accessed = base::Time::FromTimeT(file_info.st_atime);
-  results->creation_time = base::Time::FromTimeT(file_info.st_ctime);
+  results->last_modified = base::Time::FromDoubleT(file_info.st_mtim.tv_sec +
+      static_cast<double>(file_info.st_mtim.tv_nsec) /
+          base::Time::kNanosecondsPerSecond);
+  results->last_accessed = base::Time::FromDoubleT(file_info.st_atim.tv_sec +
+      static_cast<double>(file_info.st_atim.tv_nsec) /
+          base::Time::kNanosecondsPerSecond);
+  results->creation_time = base::Time::FromDoubleT(file_info.st_ctim.tv_sec +
+      static_cast<double>(file_info.st_ctim.tv_nsec) /
+          base::Time::kNanosecondsPerSecond);

[tzik, 2013/06/05 04:00:17]

Can we add Time::FromTimeSpec(const timespec&) and use it for these three?
Or, just FromTimeT(tv_sec) +
FromMicroseconds(tv_nsec/kNanosecondsPerMicroseconds) may work?

[apavlov, 2013/06/05 17:03:41]

Done.

   return true;
 }
 
 bool GetInode(const FilePath& path, ino_t* inode) {
   base::ThreadRestrictions::AssertIOAllowed();  // For call to stat().
   struct stat buffer;
   int result = stat(path.value().c_str(), &buffer);
   if (result < 0)
     return false;
 
@@ skipping 463 matching lines @@
       kFileSystemRoot, path, kRootUid, allowed_group_ids);
 }
 #endif  // defined(OS_MACOSX) && !defined(OS_IOS)
 
 int GetMaximumPathComponentLength(const FilePath& path) {
   base::ThreadRestrictions::AssertIOAllowed();
   return pathconf(path.value().c_str(), _PC_NAME_MAX);
 }
 
 }  // namespace file_util