[libcxx] r337960 - [libc++] Use __int128_t to represent file_time_type.

James Y Knight via cfe-commits cfe-commits at lists.llvm.org
Wed Jul 25 20:16:18 PDT 2018 

As is the case on most modern platforms, the ability to store a high-res
file timestamp is dependent on the filesystem the file is stored on.

The HFS+ filesystem (used by default before macOS 10.13) stores timestamps
at a 1-second granularity, and APFS (now the default) at a 1 nanosecond
granularity.

1-second granularity is also the norm on many of the supported filesystems
on Linux as well.

On Wed, Jul 25, 2018 at 10:43 PM Eric Fiselier via cfe-commits <
cfe-commits at lists.llvm.org> wrote:

> Looks like macOS 10.11 only supports a resolution of seconds, but I can't
> find documentation confirming that.
>
> I'll adjust the test.
>
> /Eric
>
> On Wed, Jul 25, 2018 at 8:33 PM Alex L <arphaman at gmail.com> wrote:
>
>> Looks like 'SupportsNanosecondRoundTrip' is set to 0.
>>
>> On 25 July 2018 at 19:30, Alex L <arphaman at gmail.com> wrote:
>>
>>> Sure,
>>>
>>> Standard Error:
>>>
>>> --
>>>
>>> PRIOR:3
>>>
>>> AFTER:0
>>>
>>>
>>> Diff:
>>>
>>>
>>> -    return last_write_time(p) == ft;
>>>
>>> +    std::cerr << "PRIOR:" << (long long)ft.time_since_epoch().count()
>>> << std::endl;
>>>
>>> +    auto ft2 = last_write_time(p);
>>>
>>> +    std::cerr << "AFTER:" << (long long)ft2.time_since_epoch().count()
>>> << std::endl;
>>>
>>> +    return ft2  == ft;
>>>
>>> On 25 July 2018 at 19:20, Eric Fiselier <eric at efcs.ca> wrote:
>>>
>>>> Could you tell me what the value of the initial time point, and the
>>>> resulting one are on this line?
>>>>
>>>>
>>>> https://github.com/llvm-mirror/libcxx/blob/master/test/std/experimental/filesystem/fs.op.funcs/fs.op.last_write_time/last_write_time.pass.cpp#L224
>>>>
>>>> On Wed, Jul 25, 2018 at 8:17 PM Alex L <arphaman at gmail.com> wrote:
>>>>
>>>>> Please let me know if this information is helpful. If not, I'll mark
>>>>> the test as UNSUPPORTED for darwin for the time being and will create an
>>>>> internal issue to track the investigation into the OS-specific failure.
>>>>> Cheers,
>>>>> Alex
>>>>>
>>>>> On 25 July 2018 at 19:12, Alex L <arphaman at gmail.com> wrote:
>>>>>
>>>>>> I got the following output on an macOS10.11 machine:
>>>>>>
>>>>>> Exit Code: 1
>>>>>>
>>>>>> Standard Error:
>>>>>>
>>>>>> --
>>>>>>
>>>>>> Test Case = file, epoch_time
>>>>>>
>>>>>> 0
>>>>>>
>>>>>> 0
>>>>>>
>>>>>> Test Case = dir, epoch_time
>>>>>>
>>>>>> 0
>>>>>>
>>>>>> 0
>>>>>>
>>>>>> Test Case = file, future_time
>>>>>>
>>>>>> In set_last_write_time_dynamic_env_test():455 Assertion
>>>>>> TEST_CHECK(CompareTime(got_time, TC.new_time)) failed.
>>>>>>
>>>>>>     in file:
>>>>>> /Users/local/llvm/projects/libcxx/test/std/experimental/filesystem/fs.op.funcs/fs.op.last_write_time/last_write_time.pass.cpp
>>>>>>
>>>>>>
>>>>>>
>>>>>> 1532581924000000000
>>>>>>
>>>>>> 1532581924695307000
>>>>>>
>>>>>> Test Case = dir, future_time
>>>>>>
>>>>>> In set_last_write_time_dynamic_env_test():455 Assertion
>>>>>> TEST_CHECK(CompareTime(got_time, TC.new_time)) failed.
>>>>>>
>>>>>>     in file:
>>>>>> /Users/local/llvm/projects/libcxx/test/std/experimental/filesystem/fs.op.funcs/fs.op.last_write_time/last_write_time.pass.cpp
>>>>>>
>>>>>>
>>>>>>
>>>>>> 1532581924000000000
>>>>>>
>>>>>> 1532581924695307000
>>>>>>
>>>>>> Test Case = file, past_time
>>>>>>
>>>>>> In set_last_write_time_dynamic_env_test():455 Assertion
>>>>>> TEST_CHECK(CompareTime(got_time, TC.new_time)) failed.
>>>>>>
>>>>>>     in file:
>>>>>> /Users/local/llvm/projects/libcxx/test/std/experimental/filesystem/fs.op.funcs/fs.op.last_write_time/last_write_time.pass.cpp
>>>>>>
>>>>>>
>>>>>>
>>>>>> 1532570860000000000
>>>>>>
>>>>>> 1532570860695273000
>>>>>>
>>>>>> Test Case = dir, past_time
>>>>>>
>>>>>> In set_last_write_time_dynamic_env_test():455 Assertion
>>>>>> TEST_CHECK(CompareTime(got_time, TC.new_time)) failed.
>>>>>>
>>>>>>     in file:
>>>>>> /Users/local/llvm/projects/libcxx/test/std/experimental/filesystem/fs.op.funcs/fs.op.last_write_time/last_write_time.pass.cpp
>>>>>>
>>>>>>
>>>>>>
>>>>>> 1532570860000000000
>>>>>>
>>>>>> 1532570860695273000
>>>>>>
>>>>>> Test Case = file, before_epoch_time
>>>>>>
>>>>>> In set_last_write_time_dynamic_env_test():455 Assertion
>>>>>> TEST_CHECK(CompareTime(got_time, TC.new_time)) failed.
>>>>>>
>>>>>>     in file:
>>>>>> /Users/local/llvm/projects/libcxx/test/std/experimental/filesystem/fs.op.funcs/fs.op.last_write_time/last_write_time.pass.cpp
>>>>>>
>>>>>>
>>>>>>
>>>>>> -223000000000
>>>>>>
>>>>>> -222000017000
>>>>>>
>>>>>> Test Case = dir, before_epoch_time
>>>>>>
>>>>>> In set_last_write_time_dynamic_env_test():455 Assertion
>>>>>> TEST_CHECK(CompareTime(got_time, TC.new_time)) failed.
>>>>>>
>>>>>>     in file:
>>>>>> /Users/local/llvm/projects/libcxx/test/std/experimental/filesystem/fs.op.funcs/fs.op.last_write_time/last_write_time.pass.cpp
>>>>>>
>>>>>>
>>>>>>
>>>>>> -223000000000
>>>>>>
>>>>>> -222000017000
>>>>>>
>>>>>> Test Case = file, just_before_epoch_time
>>>>>>
>>>>>> In set_last_write_time_dynamic_env_test():455 Assertion
>>>>>> TEST_CHECK(CompareTime(got_time, TC.new_time)) failed.
>>>>>>
>>>>>>     in file:
>>>>>> /Users/local/llvm/projects/libcxx/test/std/experimental/filesystem/fs.op.funcs/fs.op.last_write_time/last_write_time.pass.cpp
>>>>>>
>>>>>>
>>>>>>
>>>>>> -1000000000
>>>>>>
>>>>>> -17000
>>>>>>
>>>>>> Test Case = dir, just_before_epoch_time
>>>>>>
>>>>>> In set_last_write_time_dynamic_env_test():455 Assertion
>>>>>> TEST_CHECK(CompareTime(got_time, TC.new_time)) failed.
>>>>>>
>>>>>>     in file:
>>>>>> /Users/local/llvm/projects/libcxx/test/std/experimental/filesystem/fs.op.funcs/fs.op.last_write_time/last_write_time.pass.cpp
>>>>>>
>>>>>>
>>>>>>
>>>>>> -1000000000
>>>>>>
>>>>>> -17000
>>>>>>
>>>>>> In last_write_time_symlink_test():487 Assertion TEST_CHECK(got_time
>>>>>> == new_time) failed.
>>>>>>
>>>>>>     in file:
>>>>>> /Users/local/llvm/projects/libcxx/test/std/experimental/filesystem/fs.op.funcs/fs.op.last_write_time/last_write_time.pass.cpp
>>>>>>
>>>>>>
>>>>>>
>>>>>> In last_write_time_symlink_test():489 Assertion
>>>>>> TEST_CHECK(CompareTime(LastWriteTime(file), new_time)) failed.
>>>>>>
>>>>>>     in file:
>>>>>> /Users/local/llvm/projects/libcxx/test/std/experimental/filesystem/fs.op.funcs/fs.op.last_write_time/last_write_time.pass.cpp
>>>>>>
>>>>>>
>>>>>>
>>>>>> Summary for testsuite last_write_time_test_suite:
>>>>>>
>>>>>>     7 of 9 test cases passed.
>>>>>>
>>>>>>     88 of 98 assertions passed.
>>>>>>
>>>>>>     0 unsupported test cases.
>>>>>>
>>>>>> --
>>>>>>
>>>>>>
>>>>>> Compiled test failed unexpectedly!
>>>>>>
>>>>>> ********************
>>>>>>
>>>>>> Testing Time: 4.43s
>>>>>>
>>>>>> ********************
>>>>>>
>>>>>> Failing Tests (1):
>>>>>>
>>>>>>     libc++ ::
>>>>>> std/experimental/filesystem/fs.op.funcs/fs.op.last_write_time/last_write_time.pass.cpp
>>>>>>
>>>>>>
>>>>>>   Unexpected Failures: 1
>>>>>>
>>>>>> On 25 July 2018 at 18:20, Eric Fiselier <eric at efcs.ca> wrote:
>>>>>>
>>>>>>> OK. I also added debug print statements to the test to give more
>>>>>>> information. I'm just waiting for the bots to cycle now.
>>>>>>>
>>>>>>> On Wed, Jul 25, 2018 at 7:18 PM Alex L <arphaman at gmail.com> wrote:
>>>>>>>
>>>>>>>> I couldn't reproduce it on my machine, and I don't have access to
>>>>>>>> the bot ATM, but I will try it on an older OS to see if it's an issue with
>>>>>>>> the particular OS that's used on our bot.
>>>>>>>>
>>>>>>>> Cheers,
>>>>>>>> Alex
>>>>>>>>
>>>>>>>> On 25 July 2018 at 17:43, Alex L <arphaman at gmail.com> wrote:
>>>>>>>>
>>>>>>>>> I'll take a look and will try to reproduce it right now.
>>>>>>>>>
>>>>>>>>> On 25 July 2018 at 17:37, Eric Fiselier <eric at efcs.ca> wrote:
>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> On Wed, Jul 25, 2018 at 6:03 PM Alex L <arphaman at gmail.com>
>>>>>>>>>> wrote:
>>>>>>>>>>
>>>>>>>>>>> Hmm, looks like the added test is failing on Darwin even after
>>>>>>>>>>> your fixes.
>>>>>>>>>>>
>>>>>>>>>>> Do you have an idea of why that could be?
>>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> Not yet, working on it now.
>>>>>>>>>> I'm failing to reproduce it on my macbook though. If you can, any
>>>>>>>>>> information about what's going on would be helpful.
>>>>>>>>>> Like what are those actual values?
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> http://lab.llvm.org:8080/green/job/libcxx_master_cmake/4784/testReport/junit/libc++/std_experimental_filesystem_fs_op_funcs_fs_op_last_write_time/last_write_time_pass_cpp/
>>>>>>>>>>>
>>>>>>>>>>> Compiled With:
>>>>>>>>>>> ['/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++',
>>>>>>>>>>> '-o',
>>>>>>>>>>> '/Users/buildslave/jenkins/sharedspace/libcxx/build/test/std/experimental/filesystem/fs.op.funcs/fs.op.last_write_time/Output/last_write_time.pass.cpp.o',
>>>>>>>>>>> '-x', 'c++',
>>>>>>>>>>> '/Users/buildslave/jenkins/sharedspace/libcxx/libcxx.src/test/std/experimental/filesystem/fs.op.funcs/fs.op.last_write_time/last_write_time.pass.cpp',
>>>>>>>>>>> '-c', '-v', '-arch', 'x86_64', '-mmacosx-version-min=10.13',
>>>>>>>>>>> '-D_LIBCPP_DISABLE_AVAILABILITY', '-ftemplate-depth=270',
>>>>>>>>>>> '-Werror=thread-safety', '-std=c++11', '-include',
>>>>>>>>>>> '/Users/buildslave/jenkins/sharedspace/libcxx/libcxx.src/test/support/nasty_macros.hpp',
>>>>>>>>>>> '-nostdinc++',
>>>>>>>>>>> '-I/Users/buildslave/jenkins/sharedspace/libcxx/libcxx.src/include',
>>>>>>>>>>> '-I/Users/buildslave/jenkins/sharedspace/libcxx/build/include/c++build',
>>>>>>>>>>> '-isysroot',
>>>>>>>>>>> '/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.13.sdk',
>>>>>>>>>>> '-I/Users/buildslave/jenkins/sharedspace/libcxx/libcxx.src/test/support',
>>>>>>>>>>> '-DLIBCXX_FILESYSTEM_STATIC_TEST_ROOT="/Users/buildslave/jenkins/sharedspace/libcxx/libcxx.src/test/std/experimental/filesystem/Inputs/static_test_env"',
>>>>>>>>>>> '-DLIBCXX_FILESYSTEM_DYNAMIC_TEST_ROOT="/Users/buildslave/jenkins/sharedspace/libcxx/build/test/filesystem/Output/dynamic_env"',
>>>>>>>>>>> '-DLIBCXX_FILESYSTEM_DYNAMIC_TEST_HELPER="/usr/local/opt/python at 2/bin/python2.7
>>>>>>>>>>> /Users/buildslave/jenkins/sharedspace/libcxx/libcxx.src/test/support/filesystem_dynamic_test_helper.py"',
>>>>>>>>>>> '-D_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER', '-Wall', '-Wextra', '-Werror',
>>>>>>>>>>> '-Wuser-defined-warnings', '-Wshadow', '-Wno-unused-command-line-argument',
>>>>>>>>>>> '-Wno-attributes', '-Wno-pessimizing-move', '-Wno-c++11-extensions',
>>>>>>>>>>> '-Wno-user-defined-literals', '-Wno-noexcept-type',
>>>>>>>>>>> '-Wno-aligned-allocation-unavailable', '-Wsign-compare',
>>>>>>>>>>> '-Wunused-variable', '-Wunused-parameter', '-Wunreachable-code',
>>>>>>>>>>> '-Wno-conversion', '-Wno-unused-local-typedef', '-c', '&&',
>>>>>>>>>>> '/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++',
>>>>>>>>>>> '-o',
>>>>>>>>>>> '/Users/buildslave/jenkins/sharedspace/libcxx/build/test/std/experimental/filesystem/fs.op.funcs/fs.op.last_write_time/Output/last_write_time.pass.cpp.exe',
>>>>>>>>>>> '/Users/buildslave/jenkins/sharedspace/libcxx/build/test/std/experimental/filesystem/fs.op.funcs/fs.op.last_write_time/Output/last_write_time.pass.cpp.o',
>>>>>>>>>>> '-v', '-arch', 'x86_64', '-mmacosx-version-min=10.13',
>>>>>>>>>>> '-D_LIBCPP_DISABLE_AVAILABILITY', '-ftemplate-depth=270',
>>>>>>>>>>> '-L/Users/buildslave/jenkins/sharedspace/libcxx/build/lib',
>>>>>>>>>>> '-Wl,-rpath,/Users/buildslave/jenkins/sharedspace/libcxx/build/lib',
>>>>>>>>>>> '-nodefaultlibs', '-lc++experimental', '-lc++', '-lSystem']
>>>>>>>>>>> Command:
>>>>>>>>>>> ['/Users/buildslave/jenkins/sharedspace/libcxx/build/test/std/experimental/filesystem/fs.op.funcs/fs.op.last_write_time/Output/last_write_time.pass.cpp.exe']
>>>>>>>>>>> Exit Code: 1
>>>>>>>>>>> Standard Error:
>>>>>>>>>>> --
>>>>>>>>>>> In set_last_write_time_dynamic_env_test():451 Assertion
>>>>>>>>>>> TEST_CHECK(CompareTime(got_time, TC.new_time)) failed.
>>>>>>>>>>>     in file:
>>>>>>>>>>> /Users/buildslave/jenkins/sharedspace/libcxx/libcxx.src/test/std/experimental/filesystem/fs.op.funcs/fs.op.last_write_time/last_write_time.pass.cpp
>>>>>>>>>>>
>>>>>>>>>>> In set_last_write_time_dynamic_env_test():451 Assertion
>>>>>>>>>>> TEST_CHECK(CompareTime(got_time, TC.new_time)) failed.
>>>>>>>>>>>     in file:
>>>>>>>>>>> /Users/buildslave/jenkins/sharedspace/libcxx/libcxx.src/test/std/experimental/filesystem/fs.op.funcs/fs.op.last_write_time/last_write_time.pass.cpp
>>>>>>>>>>>
>>>>>>>>>>> In set_last_write_time_dynamic_env_test():451 Assertion
>>>>>>>>>>> TEST_CHECK(CompareTime(got_time, TC.new_time)) failed.
>>>>>>>>>>>     in file:
>>>>>>>>>>> /Users/buildslave/jenkins/sharedspace/libcxx/libcxx.src/test/std/experimental/filesystem/fs.op.funcs/fs.op.last_write_time/last_write_time.pass.cpp
>>>>>>>>>>>
>>>>>>>>>>> In set_last_write_time_dynamic_env_test():451 Assertion
>>>>>>>>>>> TEST_CHECK(CompareTime(got_time, TC.new_time)) failed.
>>>>>>>>>>>     in file:
>>>>>>>>>>> /Users/buildslave/jenkins/sharedspace/libcxx/libcxx.src/test/std/experimental/filesystem/fs.op.funcs/fs.op.last_write_time/last_write_time.pass.cpp
>>>>>>>>>>>
>>>>>>>>>>> In set_last_write_time_dynamic_env_test():451 Assertion
>>>>>>>>>>> TEST_CHECK(CompareTime(got_time, TC.new_time)) failed.
>>>>>>>>>>>     in file:
>>>>>>>>>>> /Users/buildslave/jenkins/sharedspace/libcxx/libcxx.src/test/std/experimental/filesystem/fs.op.funcs/fs.op.last_write_time/last_write_time.pass.cpp
>>>>>>>>>>>
>>>>>>>>>>> In set_last_write_time_dynamic_env_test():451 Assertion
>>>>>>>>>>> TEST_CHECK(CompareTime(got_time, TC.new_time)) failed.
>>>>>>>>>>>     in file:
>>>>>>>>>>> /Users/buildslave/jenkins/sharedspace/libcxx/libcxx.src/test/std/experimental/filesystem/fs.op.funcs/fs.op.last_write_time/last_write_time.pass.cpp
>>>>>>>>>>>
>>>>>>>>>>> In set_last_write_time_dynamic_env_test():451 Assertion
>>>>>>>>>>> TEST_CHECK(CompareTime(got_time, TC.new_time)) failed.
>>>>>>>>>>>     in file:
>>>>>>>>>>> /Users/buildslave/jenkins/sharedspace/libcxx/libcxx.src/test/std/experimental/filesystem/fs.op.funcs/fs.op.last_write_time/last_write_time.pass.cpp
>>>>>>>>>>>
>>>>>>>>>>> In set_last_write_time_dynamic_env_test():451 Assertion
>>>>>>>>>>> TEST_CHECK(CompareTime(got_time, TC.new_time)) failed.
>>>>>>>>>>>     in file:
>>>>>>>>>>> /Users/buildslave/jenkins/sharedspace/libcxx/libcxx.src/test/std/experimental/filesystem/fs.op.funcs/fs.op.last_write_time/last_write_time.pass.cpp
>>>>>>>>>>>
>>>>>>>>>>> In last_write_time_symlink_test():477 Assertion
>>>>>>>>>>> TEST_CHECK(got_time == new_time) failed.
>>>>>>>>>>>     in file:
>>>>>>>>>>> /Users/buildslave/jenkins/sharedspace/libcxx/libcxx.src/test/std/experimental/filesystem/fs.op.funcs/fs.op.last_write_time/last_write_time.pass.cpp
>>>>>>>>>>>
>>>>>>>>>>> In last_write_time_symlink_test():479 Assertion
>>>>>>>>>>> TEST_CHECK(CompareTime(LastWriteTime(file), new_time)) failed.
>>>>>>>>>>>     in file:
>>>>>>>>>>> /Users/buildslave/jenkins/sharedspace/libcxx/libcxx.src/test/std/experimental/filesystem/fs.op.funcs/fs.op.last_write_time/last_write_time.pass.cpp
>>>>>>>>>>>
>>>>>>>>>>> Summary for testsuite last_write_time_test_suite:
>>>>>>>>>>>     7 of 9 test cases passed.
>>>>>>>>>>>     78 of 88 assertions passed.
>>>>>>>>>>>     0 unsupported test cases.
>>>>>>>>>>> --
>>>>>>>>>>>
>>>>>>>>>>> Compiled test failed unexpectedly!
>>>>>>>>>>>
>>>>>>>>>>> Thanks,
>>>>>>>>>>> Alex
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> On 25 July 2018 at 17:00, Alex L <arphaman at gmail.com> wrote:
>>>>>>>>>>>
>>>>>>>>>>>> Sure! Fixed it up in r337984.
>>>>>>>>>>>>
>>>>>>>>>>>> On 25 July 2018 at 15:03, Eric Fiselier <eric at efcs.ca> wrote:
>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>> On Wed, Jul 25, 2018 at 3:39 PM Alex L <arphaman at gmail.com>
>>>>>>>>>>>>> wrote:
>>>>>>>>>>>>>
>>>>>>>>>>>>>> Looks like this works:
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> +++ b/src/experimental/filesystem/filesystem_common.h
>>>>>>>>>>>>>> @@ -393,7 +393,7 @@ bool set_file_times(const path& p,
>>>>>>>>>>>>>> std::array<TimeSpec, 2> const& TS,
>>>>>>>>>>>>>>                      error_code& ec) {
>>>>>>>>>>>>>>  #if !defined(_LIBCPP_USE_UTIMENSAT)
>>>>>>>>>>>>>>    using namespace chrono;
>>>>>>>>>>>>>> -  auto Convert = [](long nsec) {
>>>>>>>>>>>>>> +  auto Convert = [](long nsec) ->
>>>>>>>>>>>>>> decltype(std::declval<::timeval>().tv_usec) {
>>>>>>>>>>>>>>      return
>>>>>>>>>>>>>> duration_cast<microseconds>(nanoseconds(nsec)).count();
>>>>>>>>>>>>>>    };
>>>>>>>>>>>>>>    struct ::timeval ConvertedTS[2] = {{TS[0].tv_sec,
>>>>>>>>>>>>>> Convert(TS[0].tv_nsec)},
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> I will commit this fix in a couple of minutes.
>>>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>> I think I would prefer an explicit cast to an implicit one
>>>>>>>>>>>>> since the narrowing is intended, and should be safe.
>>>>>>>>>>>>>
>>>>>>>>>>>>> Maybe:
>>>>>>>>>>>>>
>>>>>>>>>>>>> auto Convert [](long nsec) {
>>>>>>>>>>>>>   using int_type = decltype(::timeval::tv_usec);
>>>>>>>>>>>>>   auto dur =
>>>>>>>>>>>>> duration_cast<microseconds>(nanoseconds(nsec)).count();
>>>>>>>>>>>>>   return static_cast<int_type>(dur);
>>>>>>>>>>>>> };
>>>>>>>>>>>>>
>>>>>>>>>>>>> ?
>>>>>>>>>>>>>
>>>>>>>>>>>>
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