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 <cerrno> 12 #include <chrono> 13 #include <filesystem> 14 #include <ratio> 15 #include <time.h> 16 17 #if defined(_LIBCPP_WIN32API) 18 # include "time_utils.h" 19 #endif 20 21 #if defined(_LIBCPP_WIN32API) 22 # define WIN32_LEAN_AND_MEAN 23 # define NOMINMAX 24 # include <windows.h> 25 #endif 26 27 #if __has_include(<unistd.h>) 28 # include <unistd.h> // _POSIX_TIMERS 29 #endif 30 31 #if __has_include(<sys/time.h>) 32 # include <sys/time.h> // for gettimeofday and timeval 33 #endif 34 35 #if defined(__LLVM_LIBC__) 36 # define _LIBCPP_HAS_TIMESPEC_GET 37 #endif 38 39 #if defined(__APPLE__) || defined(__gnu_hurd__) || defined(__AMDGPU__) || defined(__NVPTX__) || \ 40 (defined(_POSIX_TIMERS) && _POSIX_TIMERS > 0) 41 # define _LIBCPP_HAS_CLOCK_GETTIME 42 #endif 43 44 _LIBCPP_BEGIN_NAMESPACE_FILESYSTEM 45 46 _LIBCPP_DIAGNOSTIC_PUSH 47 _LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wdeprecated") 48 const bool _FilesystemClock::is_steady; 49 _LIBCPP_DIAGNOSTIC_POP 50 51 _FilesystemClock::time_point _FilesystemClock::now() noexcept { 52 typedef chrono::duration<rep> __secs; 53 #if defined(_LIBCPP_WIN32API) 54 typedef chrono::duration<rep, nano> __nsecs; 55 FILETIME time; 56 GetSystemTimeAsFileTime(&time); 57 detail::TimeSpec tp = detail::filetime_to_timespec(time); 58 return time_point(__secs(tp.tv_sec) + chrono::duration_cast<duration>(__nsecs(tp.tv_nsec))); 59 #elif defined(_LIBCPP_HAS_TIMESPEC_GET) 60 typedef chrono::duration<rep, nano> __nsecs; 61 struct timespec ts; 62 if (timespec_get(&ts, TIME_UTC) != TIME_UTC) 63 std::__throw_system_error(errno, "timespec_get(TIME_UTC) failed"); 64 return time_point(__secs(ts.tv_sec) + chrono::duration_cast<duration>(__nsecs(ts.tv_nsec))); 65 #elif defined(_LIBCPP_HAS_CLOCK_GETTIME) 66 typedef chrono::duration<rep, nano> __nsecs; 67 struct timespec tp; 68 if (0 != clock_gettime(CLOCK_REALTIME, &tp)) 69 std::__throw_system_error(errno, "clock_gettime(CLOCK_REALTIME) failed"); 70 return time_point(__secs(tp.tv_sec) + chrono::duration_cast<duration>(__nsecs(tp.tv_nsec))); 71 #else 72 typedef chrono::duration<rep, micro> __microsecs; 73 timeval tv; 74 gettimeofday(&tv, 0); 75 return time_point(__secs(tv.tv_sec) + __microsecs(tv.tv_usec)); 76 #endif 77 } 78 79 _LIBCPP_END_NAMESPACE_FILESYSTEM 80