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")
48const 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: &tp))
69 std::__throw_system_error(errno, what_arg: "clock_gettime(CLOCK_REALTIME) failed");
70 return time_point(__secs(tp.tv_sec) + chrono::duration_cast<duration>(fd: __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