1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
9 *
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.
13 *
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.
17 *
18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 * KIND, either express or implied.
20 *
21 ***************************************************************************/
22
23 #include "timeval.h"
24
25 #if defined(WIN32) && !defined(MSDOS)
26
27 /* set in win32_init() */
28 extern LARGE_INTEGER Curl_freq;
29 extern bool Curl_isVistaOrGreater;
30
31 /* In case of bug fix this function has a counterpart in tool_util.c */
Curl_now(void)32 struct curltime Curl_now(void)
33 {
34 struct curltime now;
35 if(Curl_isVistaOrGreater) { /* QPC timer might have issues pre-Vista */
36 LARGE_INTEGER count;
37 QueryPerformanceCounter(&count);
38 now.tv_sec = (time_t)(count.QuadPart / Curl_freq.QuadPart);
39 now.tv_usec = (int)((count.QuadPart % Curl_freq.QuadPart) * 1000000 /
40 Curl_freq.QuadPart);
41 }
42 else {
43 /* Disable /analyze warning that GetTickCount64 is preferred */
44 #if defined(_MSC_VER)
45 #pragma warning(push)
46 #pragma warning(disable:28159)
47 #endif
48 DWORD milliseconds = GetTickCount();
49 #if defined(_MSC_VER)
50 #pragma warning(pop)
51 #endif
52
53 now.tv_sec = milliseconds / 1000;
54 now.tv_usec = (milliseconds % 1000) * 1000;
55 }
56 return now;
57 }
58
59 #elif defined(HAVE_CLOCK_GETTIME_MONOTONIC)
60
Curl_now(void)61 struct curltime Curl_now(void)
62 {
63 /*
64 ** clock_gettime() is granted to be increased monotonically when the
65 ** monotonic clock is queried. Time starting point is unspecified, it
66 ** could be the system start-up time, the Epoch, or something else,
67 ** in any case the time starting point does not change once that the
68 ** system has started up.
69 */
70 #ifdef HAVE_GETTIMEOFDAY
71 struct timeval now;
72 #endif
73 struct curltime cnow;
74 struct timespec tsnow;
75
76 /*
77 ** clock_gettime() may be defined by Apple's SDK as weak symbol thus
78 ** code compiles but fails during run-time if clock_gettime() is
79 ** called on unsupported OS version.
80 */
81 #if defined(__APPLE__) && defined(HAVE_BUILTIN_AVAILABLE) && \
82 (HAVE_BUILTIN_AVAILABLE == 1)
83 bool have_clock_gettime = FALSE;
84 if(__builtin_available(macOS 10.12, iOS 10, tvOS 10, watchOS 3, *))
85 have_clock_gettime = TRUE;
86 #endif
87
88 if(
89 #if defined(__APPLE__) && defined(HAVE_BUILTIN_AVAILABLE) && \
90 (HAVE_BUILTIN_AVAILABLE == 1)
91 have_clock_gettime &&
92 #endif
93 (0 == clock_gettime(CLOCK_MONOTONIC, &tsnow))) {
94 cnow.tv_sec = tsnow.tv_sec;
95 cnow.tv_usec = (unsigned int)(tsnow.tv_nsec / 1000);
96 }
97 /*
98 ** Even when the configure process has truly detected monotonic clock
99 ** availability, it might happen that it is not actually available at
100 ** run-time. When this occurs simply fallback to other time source.
101 */
102 #ifdef HAVE_GETTIMEOFDAY
103 else {
104 (void)gettimeofday(&now, NULL);
105 cnow.tv_sec = now.tv_sec;
106 cnow.tv_usec = (unsigned int)now.tv_usec;
107 }
108 #else
109 else {
110 cnow.tv_sec = time(NULL);
111 cnow.tv_usec = 0;
112 }
113 #endif
114 return cnow;
115 }
116
117 #elif defined(HAVE_MACH_ABSOLUTE_TIME)
118
119 #include <stdint.h>
120 #include <mach/mach_time.h>
121
Curl_now(void)122 struct curltime Curl_now(void)
123 {
124 /*
125 ** Monotonic timer on Mac OS is provided by mach_absolute_time(), which
126 ** returns time in Mach "absolute time units," which are platform-dependent.
127 ** To convert to nanoseconds, one must use conversion factors specified by
128 ** mach_timebase_info().
129 */
130 static mach_timebase_info_data_t timebase;
131 struct curltime cnow;
132 uint64_t usecs;
133
134 if(0 == timebase.denom)
135 (void) mach_timebase_info(&timebase);
136
137 usecs = mach_absolute_time();
138 usecs *= timebase.numer;
139 usecs /= timebase.denom;
140 usecs /= 1000;
141
142 cnow.tv_sec = usecs / 1000000;
143 cnow.tv_usec = (int)(usecs % 1000000);
144
145 return cnow;
146 }
147
148 #elif defined(HAVE_GETTIMEOFDAY)
149
Curl_now(void)150 struct curltime Curl_now(void)
151 {
152 /*
153 ** gettimeofday() is not granted to be increased monotonically, due to
154 ** clock drifting and external source time synchronization it can jump
155 ** forward or backward in time.
156 */
157 struct timeval now;
158 struct curltime ret;
159 (void)gettimeofday(&now, NULL);
160 ret.tv_sec = now.tv_sec;
161 ret.tv_usec = (int)now.tv_usec;
162 return ret;
163 }
164
165 #else
166
Curl_now(void)167 struct curltime Curl_now(void)
168 {
169 /*
170 ** time() returns the value of time in seconds since the Epoch.
171 */
172 struct curltime now;
173 now.tv_sec = time(NULL);
174 now.tv_usec = 0;
175 return now;
176 }
177
178 #endif
179
180 /*
181 * Returns: time difference in number of milliseconds. For too large diffs it
182 * returns max value.
183 *
184 * @unittest: 1323
185 */
Curl_timediff(struct curltime newer,struct curltime older)186 timediff_t Curl_timediff(struct curltime newer, struct curltime older)
187 {
188 timediff_t diff = (timediff_t)newer.tv_sec-older.tv_sec;
189 if(diff >= (TIMEDIFF_T_MAX/1000))
190 return TIMEDIFF_T_MAX;
191 else if(diff <= (TIMEDIFF_T_MIN/1000))
192 return TIMEDIFF_T_MIN;
193 return diff * 1000 + (newer.tv_usec-older.tv_usec)/1000;
194 }
195
196 /*
197 * Returns: time difference in number of microseconds. For too large diffs it
198 * returns max value.
199 */
Curl_timediff_us(struct curltime newer,struct curltime older)200 timediff_t Curl_timediff_us(struct curltime newer, struct curltime older)
201 {
202 timediff_t diff = (timediff_t)newer.tv_sec-older.tv_sec;
203 if(diff >= (TIMEDIFF_T_MAX/1000000))
204 return TIMEDIFF_T_MAX;
205 else if(diff <= (TIMEDIFF_T_MIN/1000000))
206 return TIMEDIFF_T_MIN;
207 return diff * 1000000 + newer.tv_usec-older.tv_usec;
208 }
209