libcxx/src/filesystem/filesystem_clock.cpp

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include <__config>
  10 #include <__system_error/throw_system_error.h>
  11 #include <chrono>
  12 #include <filesystem>
  13 #include <time.h>
  14
  15 #if defined(_LIBCPP_WIN32API)
  16 #  include "time_utils.h"
  17 #endif
  18
  19 #if defined(_LIBCPP_WIN32API)
  20 #  define WIN32_LEAN_AND_MEAN
  21 #  define NOMINMAX
  22 #  include <windows.h>
  23 #endif
  24
  25 #if __has_include(<unistd.h>)
  26 #  include <unistd.h> // _POSIX_TIMERS
  27 #endif
  28
  29 #if __has_include(<sys/time.h>)
  30 #  include <sys/time.h> // for gettimeofday and timeval
  31 #endif
  32
  33 #if defined(__LLVM_LIBC__)
  34 #  define _LIBCPP_HAS_TIMESPEC_GET
  35 #endif
  36
  37 #if defined(__APPLE__) || defined(__gnu_hurd__) || defined(__AMDGPU__) || defined(__NVPTX__) ||                        \
  38     (defined(_POSIX_TIMERS) && _POSIX_TIMERS > 0)
  39 #  define _LIBCPP_HAS_CLOCK_GETTIME
  40 #endif
  41
  42 _LIBCPP_BEGIN_NAMESPACE_FILESYSTEM
  43
  44 _LIBCPP_DIAGNOSTIC_PUSH
  45 _LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wdeprecated")
  46 const bool _FilesystemClock::is_steady;
  47 _LIBCPP_DIAGNOSTIC_POP
  48
  49 _FilesystemClock::time_point _FilesystemClock::now() noexcept {
  50   typedef chrono::duration<rep> __secs;
  51 #if defined(_LIBCPP_WIN32API)
  52   typedef chrono::duration<rep, nano> __nsecs;
  53   FILETIME time;
  54   GetSystemTimeAsFileTime(&time);
  55   detail::TimeSpec tp = detail::filetime_to_timespec(time);
  56   return time_point(__secs(tp.tv_sec) + chrono::duration_cast<duration>(__nsecs(tp.tv_nsec)));
  57 #elif defined(_LIBCPP_HAS_TIMESPEC_GET)
  58   typedef chrono::duration<rep, nano> __nsecs;
  59   struct timespec ts;
  60   if (timespec_get(&ts, TIME_UTC) != TIME_UTC)
  61     __throw_system_error(errno, "timespec_get(TIME_UTC) failed");
  62   return time_point(__secs(ts.tv_sec) + chrono::duration_cast<duration>(__nsecs(ts.tv_nsec)));
  63 #elif defined(_LIBCPP_HAS_CLOCK_GETTIME)
  64   typedef chrono::duration<rep, nano> __nsecs;
  65   struct timespec tp;
  66   if (0 != clock_gettime(CLOCK_REALTIME, &tp))
  67     __throw_system_error(errno, "clock_gettime(CLOCK_REALTIME) failed");
  68   return time_point(__secs(tp.tv_sec) + chrono::duration_cast<duration>(__nsecs(tp.tv_nsec)));
  69 #else
  70   typedef chrono::duration<rep, micro> __microsecs;
  71   timeval tv;
  72   gettimeofday(&tv, 0);
  73   return time_point(__secs(tv.tv_sec) + __microsecs(tv.tv_usec));
  74 #endif
  75 }
  76
  77 _LIBCPP_END_NAMESPACE_FILESYSTEM