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1 /***************************************************************************
2  *                                  _   _ ____  _
3  *  Project                     ___| | | |  _ \| |
4  *                             / __| | | | |_) | |
5  *                            | (__| |_| |  _ <| |___
6  *                             \___|\___/|_| \_\_____|
7  *
8  * Copyright (C) 1998 - 2015, 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 http://curl.haxx.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 
curlx_tvnow(void)27 struct timeval curlx_tvnow(void)
28 {
29   /*
30   ** GetTickCount() is available on _all_ Windows versions from W95 up
31   ** to nowadays. Returns milliseconds elapsed since last system boot,
32   ** increases monotonically and wraps once 49.7 days have elapsed.
33   */
34   struct timeval now;
35 #if !defined(_WIN32_WINNT) || !defined(_WIN32_WINNT_VISTA) || \
36     (_WIN32_WINNT < _WIN32_WINNT_VISTA)
37   DWORD milliseconds = GetTickCount();
38   now.tv_sec = milliseconds / 1000;
39   now.tv_usec = (milliseconds % 1000) * 1000;
40 #else
41   ULONGLONG milliseconds = GetTickCount64();
42   now.tv_sec = (long) (milliseconds / 1000);
43   now.tv_usec = (long) (milliseconds % 1000) * 1000;
44 #endif
45 
46   return now;
47 }
48 
49 #elif defined(HAVE_CLOCK_GETTIME_MONOTONIC)
50 
curlx_tvnow(void)51 struct timeval curlx_tvnow(void)
52 {
53   /*
54   ** clock_gettime() is granted to be increased monotonically when the
55   ** monotonic clock is queried. Time starting point is unspecified, it
56   ** could be the system start-up time, the Epoch, or something else,
57   ** in any case the time starting point does not change once that the
58   ** system has started up.
59   */
60   struct timeval now;
61   struct timespec tsnow;
62   if(0 == clock_gettime(CLOCK_MONOTONIC, &tsnow)) {
63     now.tv_sec = tsnow.tv_sec;
64     now.tv_usec = tsnow.tv_nsec / 1000;
65   }
66   /*
67   ** Even when the configure process has truly detected monotonic clock
68   ** availability, it might happen that it is not actually available at
69   ** run-time. When this occurs simply fallback to other time source.
70   */
71 #ifdef HAVE_GETTIMEOFDAY
72   else
73     (void)gettimeofday(&now, NULL);
74 #else
75   else {
76     now.tv_sec = (long)time(NULL);
77     now.tv_usec = 0;
78   }
79 #endif
80   return now;
81 }
82 
83 #elif defined(HAVE_GETTIMEOFDAY)
84 
curlx_tvnow(void)85 struct timeval curlx_tvnow(void)
86 {
87   /*
88   ** gettimeofday() is not granted to be increased monotonically, due to
89   ** clock drifting and external source time synchronization it can jump
90   ** forward or backward in time.
91   */
92   struct timeval now;
93   (void)gettimeofday(&now, NULL);
94   return now;
95 }
96 
97 #else
98 
curlx_tvnow(void)99 struct timeval curlx_tvnow(void)
100 {
101   /*
102   ** time() returns the value of time in seconds since the Epoch.
103   */
104   struct timeval now;
105   now.tv_sec = (long)time(NULL);
106   now.tv_usec = 0;
107   return now;
108 }
109 
110 #endif
111 
112 /*
113  * Make sure that the first argument is the more recent time, as otherwise
114  * we'll get a weird negative time-diff back...
115  *
116  * Returns: the time difference in number of milliseconds.
117  */
curlx_tvdiff(struct timeval newer,struct timeval older)118 long curlx_tvdiff(struct timeval newer, struct timeval older)
119 {
120   return (newer.tv_sec-older.tv_sec)*1000+
121     (long)(newer.tv_usec-older.tv_usec)/1000;
122 }
123 
124 /*
125  * Same as curlx_tvdiff but with full usec resolution.
126  *
127  * Returns: the time difference in seconds with subsecond resolution.
128  */
curlx_tvdiff_secs(struct timeval newer,struct timeval older)129 double curlx_tvdiff_secs(struct timeval newer, struct timeval older)
130 {
131   if(newer.tv_sec != older.tv_sec)
132     return (double)(newer.tv_sec-older.tv_sec)+
133       (double)(newer.tv_usec-older.tv_usec)/1000000.0;
134   else
135     return (double)(newer.tv_usec-older.tv_usec)/1000000.0;
136 }
137 
138 /* return the number of seconds in the given input timeval struct */
Curl_tvlong(struct timeval t1)139 long Curl_tvlong(struct timeval t1)
140 {
141   return t1.tv_sec;
142 }
143