1 /***************************************************************************
3 * Project ___| | | | _ \| |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
8 * Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
10 * This software is licensed as described in the file COPYING, which
11 * you should have received as part of this distribution. The terms
12 * are also available at https://curl.se/docs/copyright.html.
14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
15 * copies of the Software, and permit persons to whom the Software is
16 * furnished to do so, under the terms of the COPYING file.
18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 * KIND, either express or implied.
21 * SPDX-License-Identifier: curl
23 ***************************************************************************/
27 #if defined(WIN32) && !defined(MSDOS)
29 /* set in win32_init() */
30 extern LARGE_INTEGER Curl_freq;
31 extern bool Curl_isVistaOrGreater;
33 /* In case of bug fix this function has a counterpart in tool_util.c */
34 struct curltime Curl_now(void)
37 if(Curl_isVistaOrGreater) { /* QPC timer might have issues pre-Vista */
39 QueryPerformanceCounter(&count);
40 now.tv_sec = (time_t)(count.QuadPart / Curl_freq.QuadPart);
41 now.tv_usec = (int)((count.QuadPart % Curl_freq.QuadPart) * 1000000 /
45 /* Disable /analyze warning that GetTickCount64 is preferred */
48 #pragma warning(disable:28159)
50 DWORD milliseconds = GetTickCount();
55 now.tv_sec = milliseconds / 1000;
56 now.tv_usec = (milliseconds % 1000) * 1000;
61 #elif defined(HAVE_CLOCK_GETTIME_MONOTONIC)
63 struct curltime Curl_now(void)
66 ** clock_gettime() is granted to be increased monotonically when the
67 ** monotonic clock is queried. Time starting point is unspecified, it
68 ** could be the system start-up time, the Epoch, or something else,
69 ** in any case the time starting point does not change once that the
70 ** system has started up.
72 #ifdef HAVE_GETTIMEOFDAY
76 struct timespec tsnow;
79 ** clock_gettime() may be defined by Apple's SDK as weak symbol thus
80 ** code compiles but fails during run-time if clock_gettime() is
81 ** called on unsupported OS version.
83 #if defined(__APPLE__) && defined(HAVE_BUILTIN_AVAILABLE) && \
84 (HAVE_BUILTIN_AVAILABLE == 1)
85 bool have_clock_gettime = FALSE;
86 if(__builtin_available(macOS 10.12, iOS 10, tvOS 10, watchOS 3, *))
87 have_clock_gettime = TRUE;
91 #if defined(__APPLE__) && defined(HAVE_BUILTIN_AVAILABLE) && \
92 (HAVE_BUILTIN_AVAILABLE == 1)
95 (0 == clock_gettime(CLOCK_MONOTONIC, &tsnow))) {
96 cnow.tv_sec = tsnow.tv_sec;
97 cnow.tv_usec = (unsigned int)(tsnow.tv_nsec / 1000);
100 ** Even when the configure process has truly detected monotonic clock
101 ** availability, it might happen that it is not actually available at
102 ** run-time. When this occurs simply fallback to other time source.
104 #ifdef HAVE_GETTIMEOFDAY
106 (void)gettimeofday(&now, NULL);
107 cnow.tv_sec = now.tv_sec;
108 cnow.tv_usec = (unsigned int)now.tv_usec;
112 cnow.tv_sec = time(NULL);
119 #elif defined(HAVE_MACH_ABSOLUTE_TIME)
122 #include <mach/mach_time.h>
124 struct curltime Curl_now(void)
127 ** Monotonic timer on Mac OS is provided by mach_absolute_time(), which
128 ** returns time in Mach "absolute time units," which are platform-dependent.
129 ** To convert to nanoseconds, one must use conversion factors specified by
130 ** mach_timebase_info().
132 static mach_timebase_info_data_t timebase;
133 struct curltime cnow;
136 if(0 == timebase.denom)
137 (void) mach_timebase_info(&timebase);
139 usecs = mach_absolute_time();
140 usecs *= timebase.numer;
141 usecs /= timebase.denom;
144 cnow.tv_sec = usecs / 1000000;
145 cnow.tv_usec = (int)(usecs % 1000000);
150 #elif defined(HAVE_GETTIMEOFDAY)
152 struct curltime Curl_now(void)
155 ** gettimeofday() is not granted to be increased monotonically, due to
156 ** clock drifting and external source time synchronization it can jump
157 ** forward or backward in time.
161 (void)gettimeofday(&now, NULL);
162 ret.tv_sec = now.tv_sec;
163 ret.tv_usec = (int)now.tv_usec;
169 struct curltime Curl_now(void)
172 ** time() returns the value of time in seconds since the Epoch.
175 now.tv_sec = time(NULL);
183 * Returns: time difference in number of milliseconds. For too large diffs it
188 timediff_t Curl_timediff(struct curltime newer, struct curltime older)
190 timediff_t diff = (timediff_t)newer.tv_sec-older.tv_sec;
191 if(diff >= (TIMEDIFF_T_MAX/1000))
192 return TIMEDIFF_T_MAX;
193 else if(diff <= (TIMEDIFF_T_MIN/1000))
194 return TIMEDIFF_T_MIN;
195 return diff * 1000 + (newer.tv_usec-older.tv_usec)/1000;
199 * Returns: time difference in number of microseconds. For too large diffs it
202 timediff_t Curl_timediff_us(struct curltime newer, struct curltime older)
204 timediff_t diff = (timediff_t)newer.tv_sec-older.tv_sec;
205 if(diff >= (TIMEDIFF_T_MAX/1000000))
206 return TIMEDIFF_T_MAX;
207 else if(diff <= (TIMEDIFF_T_MIN/1000000))
208 return TIMEDIFF_T_MIN;
209 return diff * 1000000 + newer.tv_usec-older.tv_usec;