1 | /***************************************************************************
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2 | * _ _ ____ _
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3 | * Project ___| | | | _ \| |
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4 | * / __| | | | |_) | |
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5 | * | (__| |_| | _ <| |___
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6 | * \___|\___/|_| \_\_____|
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7 | *
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8 | * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
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9 | *
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10 | * This software is licensed as described in the file COPYING, which
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11 | * you should have received as part of this distribution. The terms
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12 | * are also available at https://curl.haxx.se/docs/copyright.html.
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13 | *
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14 | * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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15 | * copies of the Software, and permit persons to whom the Software is
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16 | * furnished to do so, under the terms of the COPYING file.
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17 | *
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18 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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19 | * KIND, either express or implied.
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20 | *
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21 | ***************************************************************************/
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22 |
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23 | #include "timeval.h"
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24 |
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25 | #if defined(WIN32) && !defined(MSDOS)
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26 |
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27 | struct curltime Curl_now(void)
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28 | {
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29 | /*
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30 | ** GetTickCount() is available on _all_ Windows versions from W95 up
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31 | ** to nowadays. Returns milliseconds elapsed since last system boot,
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32 | ** increases monotonically and wraps once 49.7 days have elapsed.
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33 | */
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34 | struct curltime now;
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35 | #if !defined(_WIN32_WINNT) || !defined(_WIN32_WINNT_VISTA) || \
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36 | (_WIN32_WINNT < _WIN32_WINNT_VISTA)
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37 | DWORD milliseconds = GetTickCount();
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38 | now.tv_sec = milliseconds / 1000;
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39 | now.tv_usec = (milliseconds % 1000) * 1000;
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40 | #else
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41 | ULONGLONG milliseconds = GetTickCount64();
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42 | now.tv_sec = (time_t) (milliseconds / 1000);
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43 | now.tv_usec = (unsigned int) (milliseconds % 1000) * 1000;
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44 | #endif
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45 |
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46 | return now;
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47 | }
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48 |
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49 | #elif defined(HAVE_CLOCK_GETTIME_MONOTONIC)
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50 |
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51 | struct curltime Curl_now(void)
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52 | {
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53 | /*
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54 | ** clock_gettime() is granted to be increased monotonically when the
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55 | ** monotonic clock is queried. Time starting point is unspecified, it
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56 | ** could be the system start-up time, the Epoch, or something else,
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57 | ** in any case the time starting point does not change once that the
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58 | ** system has started up.
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59 | */
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60 | struct timeval now;
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61 | struct curltime cnow;
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62 | struct timespec tsnow;
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63 | if(0 == clock_gettime(CLOCK_MONOTONIC, &tsnow)) {
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64 | cnow.tv_sec = tsnow.tv_sec;
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65 | cnow.tv_usec = (unsigned int)(tsnow.tv_nsec / 1000);
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66 | }
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67 | /*
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68 | ** Even when the configure process has truly detected monotonic clock
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69 | ** availability, it might happen that it is not actually available at
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70 | ** run-time. When this occurs simply fallback to other time source.
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71 | */
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72 | #ifdef HAVE_GETTIMEOFDAY
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73 | else {
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74 | (void)gettimeofday(&now, NULL);
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75 | cnow.tv_sec = now.tv_sec;
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76 | cnow.tv_usec = (unsigned int)now.tv_usec;
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77 | }
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78 | #else
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79 | else {
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80 | cnow.tv_sec = time(NULL);
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81 | cnow.tv_usec = 0;
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82 | }
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83 | #endif
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84 | return cnow;
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85 | }
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86 |
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87 | #elif defined(HAVE_MACH_ABSOLUTE_TIME)
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88 |
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89 | #include <stdint.h>
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90 | #include <mach/mach_time.h>
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91 |
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92 | struct curltime Curl_now(void)
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93 | {
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94 | /*
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95 | ** Monotonic timer on Mac OS is provided by mach_absolute_time(), which
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96 | ** returns time in Mach "absolute time units," which are platform-dependent.
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97 | ** To convert to nanoseconds, one must use conversion factors specified by
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98 | ** mach_timebase_info().
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99 | */
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100 | static mach_timebase_info_data_t timebase;
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101 | struct curltime cnow;
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102 | uint64_t usecs;
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103 |
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104 | if(0 == timebase.denom)
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105 | (void) mach_timebase_info(&timebase);
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106 |
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107 | usecs = mach_absolute_time();
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108 | usecs *= timebase.numer;
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109 | usecs /= timebase.denom;
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110 | usecs /= 1000;
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111 |
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112 | cnow.tv_sec = usecs / 1000000;
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113 | cnow.tv_usec = usecs % 1000000;
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114 |
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115 | return cnow;
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116 | }
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117 |
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118 | #elif defined(HAVE_GETTIMEOFDAY)
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119 |
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120 | struct curltime Curl_now(void)
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121 | {
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122 | /*
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123 | ** gettimeofday() is not granted to be increased monotonically, due to
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124 | ** clock drifting and external source time synchronization it can jump
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125 | ** forward or backward in time.
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126 | */
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127 | struct timeval now;
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128 | struct curltime ret;
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129 | (void)gettimeofday(&now, NULL);
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130 | ret.tv_sec = now.tv_sec;
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131 | ret.tv_usec = now.tv_usec;
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132 | return ret;
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133 | }
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134 |
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135 | #else
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136 |
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137 | struct curltime Curl_now(void)
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138 | {
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139 | /*
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140 | ** time() returns the value of time in seconds since the Epoch.
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141 | */
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142 | struct curltime now;
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143 | now.tv_sec = time(NULL);
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144 | now.tv_usec = 0;
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145 | return now;
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146 | }
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147 |
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148 | #endif
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149 |
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150 | #if SIZEOF_TIME_T < 8
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151 | #define TIME_MAX INT_MAX
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152 | #define TIME_MIN INT_MIN
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153 | #else
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154 | #define TIME_MAX 9223372036854775807LL
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155 | #define TIME_MIN -9223372036854775807LL
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156 | #endif
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157 |
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158 | /*
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159 | * Returns: time difference in number of milliseconds. For too large diffs it
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160 | * returns max value.
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161 | *
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162 | * @unittest: 1323
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163 | */
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164 | timediff_t Curl_timediff(struct curltime newer, struct curltime older)
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165 | {
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166 | timediff_t diff = newer.tv_sec-older.tv_sec;
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167 | if(diff >= (TIME_MAX/1000))
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168 | return TIME_MAX;
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169 | else if(diff <= (TIME_MIN/1000))
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170 | return TIME_MIN;
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171 | return diff * 1000 + (newer.tv_usec-older.tv_usec)/1000;
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172 | }
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173 |
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174 | /*
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175 | * Returns: time difference in number of microseconds. For too large diffs it
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176 | * returns max value.
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177 | */
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178 | timediff_t Curl_timediff_us(struct curltime newer, struct curltime older)
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179 | {
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180 | timediff_t diff = newer.tv_sec-older.tv_sec;
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181 | if(diff >= (TIME_MAX/1000000))
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182 | return TIME_MAX;
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183 | else if(diff <= (TIME_MIN/1000000))
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184 | return TIME_MIN;
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185 | return diff * 1000000 + newer.tv_usec-older.tv_usec;
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186 | }
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