0
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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5
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6
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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9
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10
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11 ngx_epoch_msec_t ngx_elapsed_msec;
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12 ngx_epoch_msec_t ngx_old_elapsed_msec;
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13 ngx_epoch_msec_t ngx_start_msec;
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14
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15 static ngx_tm_t ngx_cached_gmtime;
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16 static ngx_int_t ngx_gmtoff;
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17
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18
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19 /*
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20 * In the threaded mode only one thread updates the cached time and strings
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21 * and these operations are protected by the mutex. The reading of the cached
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22 * time and strings is not protected by the mutex. To avoid the race
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23 * conditions for non-atomic values we use the NGX_TIME_SLOTS slots to store
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24 * time value and strings. Thus thread may get the corrupted values only
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25 * if it is preempted while copying and then it is not scheduled to run
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26 * more than NGX_TIME_SLOTS seconds.
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27 */
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28
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29 #if (NGX_THREADS)
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30
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31 #define NGX_TIME_SLOTS 60
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32 static ngx_uint_t slot = NGX_TIME_SLOTS;
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33
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34 static ngx_mutex_t *ngx_time_mutex;
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35
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36 #else
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37
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38 #define NGX_TIME_SLOTS 1
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39 #define slot 0
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40
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41 #endif
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42
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43
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26
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44 #if (NGX_THREADS && (NGX_TIME_T_SIZE > NGX_SIG_ATOMIC_T_SIZE))
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45
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46 volatile time_t *ngx_cached_time;
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47 static time_t cached_time[NGX_TIME_SLOTS];
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48
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49 #else
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50
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51 volatile time_t ngx_cached_time;
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52
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53 #endif
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54
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55
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56 ngx_thread_volatile ngx_str_t ngx_cached_err_log_time;
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57 ngx_thread_volatile ngx_str_t ngx_cached_http_time;
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58 ngx_thread_volatile ngx_str_t ngx_cached_http_log_time;
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59
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60
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61 static u_char cached_err_log_time[NGX_TIME_SLOTS]
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62 [sizeof("1970/09/28 12:00:00")];
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63 static u_char cached_http_time[NGX_TIME_SLOTS]
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64 [sizeof("Mon, 28 Sep 1970 06:00:00 GMT")];
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65 static u_char cached_http_log_time[NGX_TIME_SLOTS]
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66 [sizeof("28/Sep/1970:12:00:00 +0600")];
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67
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68
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69 static char *week[] = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };
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70 static char *months[] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
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71 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
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72
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50
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73 void
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74 ngx_time_init(void)
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75 {
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76 struct timeval tv;
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77
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78 ngx_memzero(&ngx_cached_gmtime, sizeof(ngx_tm_t));
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79 #ifdef ngx_tm_zone
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80 ngx_cached_gmtime.ngx_tm_zone = "GMT";
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81 #endif
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82
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83 ngx_cached_err_log_time.len = sizeof("1970/09/28 12:00:00") - 1;
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84 ngx_cached_http_time.len = sizeof("Mon, 28 Sep 1970 06:00:00 GMT") - 1;
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85 ngx_cached_http_log_time.len = sizeof("28/Sep/1970:12:00:00 +0600") - 1;
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86
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26
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87 #if (NGX_THREADS && (NGX_TIME_T_SIZE > NGX_SIG_ATOMIC_T_SIZE))
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88 ngx_cached_time = &cached_time[0];
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89 #endif
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90
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91 ngx_gettimeofday(&tv);
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92
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93 ngx_start_msec = (ngx_epoch_msec_t) tv.tv_sec * 1000 + tv.tv_usec / 1000;
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94 ngx_old_elapsed_msec = 0;
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95 ngx_elapsed_msec = 0;
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96
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97 #if !(NGX_WIN32)
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98 tzset();
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99 #endif
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100
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101 ngx_time_update(tv.tv_sec);
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102 }
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103
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104
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105 #if (NGX_THREADS)
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106
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107 ngx_int_t
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108 ngx_time_mutex_init(ngx_log_t *log)
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109 {
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110 ngx_time_mutex = ngx_mutex_init(log, NGX_MUTEX_LIGHT);
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111
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112 if (ngx_time_mutex == NULL) {
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113 return NGX_ERROR;
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114 }
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115
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116 return NGX_OK;
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117 }
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118
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119 #endif
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120
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121
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50
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122 void
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123 ngx_time_update(time_t s)
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124 {
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125 u_char *p;
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126 ngx_tm_t tm;
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127
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128 if (ngx_time() == s) {
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129 return;
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130 }
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131
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132 #if (NGX_THREADS)
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133
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134 if (ngx_mutex_trylock(ngx_time_mutex) != NGX_OK) {
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135 return;
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136 }
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137
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138 if (slot == NGX_TIME_SLOTS) {
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139 slot = 0;
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140 } else {
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141 slot++;
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142 }
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143
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144 #if (NGX_THREADS && (NGX_TIME_T_SIZE > NGX_SIG_ATOMIC_T_SIZE))
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145 ngx_cached_time = &cached_time[slot];
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146 #endif
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147
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148 #endif
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149
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150 ngx_time() = s;
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151
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152 ngx_gmtime(s, &ngx_cached_gmtime);
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153
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154
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155 p = cached_http_time[slot];
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156
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157 ngx_sprintf(p, "%s, %02d %s %4d %02d:%02d:%02d GMT",
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158 week[ngx_cached_gmtime.ngx_tm_wday],
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159 ngx_cached_gmtime.ngx_tm_mday,
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160 months[ngx_cached_gmtime.ngx_tm_mon - 1],
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161 ngx_cached_gmtime.ngx_tm_year,
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162 ngx_cached_gmtime.ngx_tm_hour,
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163 ngx_cached_gmtime.ngx_tm_min,
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164 ngx_cached_gmtime.ngx_tm_sec);
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165
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166 ngx_cached_http_time.data = p;
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167
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168
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18
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169 #if (NGX_HAVE_GETTIMEZONE)
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170
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171 ngx_gmtoff = ngx_gettimezone();
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172 ngx_gmtime(s + ngx_gmtoff * 60, &tm);
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173
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174 #elif (NGX_HAVE_GMTOFF)
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175
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176 ngx_localtime(&tm);
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177 ngx_gmtoff = tm.ngx_tm_gmtoff / 60;
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178
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179 #else
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180
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181 ngx_localtime(&tm);
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182 ngx_gmtoff = ngx_timezone(tm.ngx_tm_isdst);
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183
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184 #endif
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185
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186
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187 p = cached_err_log_time[slot];
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188
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189 ngx_sprintf(p, "%4d/%02d/%02d %02d:%02d:%02d",
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190 tm.ngx_tm_year, tm.ngx_tm_mon,
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191 tm.ngx_tm_mday, tm.ngx_tm_hour,
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192 tm.ngx_tm_min, tm.ngx_tm_sec);
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193
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194 ngx_cached_err_log_time.data = p;
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195
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196
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197 p = cached_http_log_time[slot];
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198
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199 ngx_sprintf(p, "%02d/%s/%d:%02d:%02d:%02d %c%02d%02d",
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200 tm.ngx_tm_mday, months[tm.ngx_tm_mon - 1],
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201 tm.ngx_tm_year, tm.ngx_tm_hour,
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202 tm.ngx_tm_min, tm.ngx_tm_sec,
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203 ngx_gmtoff < 0 ? '-' : '+',
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204 abs(ngx_gmtoff / 60), abs(ngx_gmtoff % 60));
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205
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206 ngx_cached_http_log_time.data = p;
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207
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208
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209 #if (NGX_THREADS)
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210 ngx_mutex_unlock(ngx_time_mutex);
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211 #endif
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212
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213 }
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214
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215
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216 u_char *
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217 ngx_http_time(u_char *buf, time_t t)
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218 {
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219 ngx_tm_t tm;
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220
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221 ngx_gmtime(t, &tm);
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222
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223 return ngx_sprintf(buf, "%s, %02d %s %4d %02d:%02d:%02d GMT",
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224 week[tm.ngx_tm_wday],
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225 tm.ngx_tm_mday,
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226 months[tm.ngx_tm_mon - 1],
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227 tm.ngx_tm_year,
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228 tm.ngx_tm_hour,
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229 tm.ngx_tm_min,
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230 tm.ngx_tm_sec);
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231 }
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232
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233
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234 u_char *
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235 ngx_http_cookie_time(u_char *buf, time_t t)
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236 {
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237 ngx_tm_t tm;
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238
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239 ngx_gmtime(t, &tm);
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240
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241 /*
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242 * Netscape 3.x does not understand 4-digit years at all and
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243 * 2-digit years more than "37"
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244 */
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245
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246 return ngx_sprintf(buf,
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247 (tm.ngx_tm_year > 2037) ?
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248 "%s, %02d-%s-%d %02d:%02d:%02d GMT":
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249 "%s, %02d-%s-%02d %02d:%02d:%02d GMT",
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250 week[tm.ngx_tm_wday],
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251 tm.ngx_tm_mday,
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252 months[tm.ngx_tm_mon - 1],
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253 (tm.ngx_tm_year > 2037) ? tm.ngx_tm_year:
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254 tm.ngx_tm_year % 100,
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255 tm.ngx_tm_hour,
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256 tm.ngx_tm_min,
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257 tm.ngx_tm_sec);
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258 }
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259
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260
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261 void
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262 ngx_gmtime(time_t t, ngx_tm_t *tp)
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263 {
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264 ngx_int_t sec, min, hour, mday, mon, year, wday, yday, days;
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265
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266 days = t / 86400;
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267
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268 /* Jaunary 1, 1970 was Thursday */
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269 wday = (4 + days) % 7;
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270
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271 t %= 86400;
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272 hour = t / 3600;
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273 t %= 3600;
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274 min = t / 60;
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275 sec = t % 60;
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276
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277 /* the algorithm based on Gauss's formula */
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278
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279 days = days - (31 + 28) + 719527;
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280
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281 year = days * 400 / (365 * 400 + 100 - 4 + 1);
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282 yday = days - (365 * year + year / 4 - year / 100 + year / 400);
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283
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284 mon = (yday + 31) * 12 / 367;
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285 mday = yday - (mon * 367 / 12 - 31);
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286
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287 mon += 2;
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288
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289 if (yday >= 306) {
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290
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291 /*
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292 * there is no "yday" in Win32 SYSTEMTIME
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293 *
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294 * yday -= 306;
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295 */
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296
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297 year++;
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298 mon -= 12;
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299
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300 if (mday == 0) {
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301 /* Jaunary 31 */
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302 mon = 1;
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303 mday = 31;
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304
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305 } else if (mon == 2) {
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306
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307 if ((year % 4 == 0) && (year % 100 || (year % 400 == 0))) {
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308 if (mday > 29) {
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309 mon = 3;
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310 mday -= 29;
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311 }
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312
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313 } else if (mday > 28) {
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314 mon = 3;
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315 mday -= 28;
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316 }
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317 }
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318 /*
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319 * there is no "yday" in Win32 SYSTEMTIME
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320 *
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321 * } else {
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322 * yday += 31 + 28;
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323 *
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324 * if ((year % 4 == 0) && (year % 100 || (year % 400 == 0))) {
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325 * yday++;
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326 * }
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327 */
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328 }
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329
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330 tp->ngx_tm_sec = (ngx_tm_sec_t) sec;
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331 tp->ngx_tm_min = (ngx_tm_min_t) min;
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332 tp->ngx_tm_hour = (ngx_tm_hour_t) hour;
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333 tp->ngx_tm_mday = (ngx_tm_mday_t) mday;
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334 tp->ngx_tm_mon = (ngx_tm_mon_t) mon;
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335 tp->ngx_tm_year = (ngx_tm_year_t) year;
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336 tp->ngx_tm_wday = (ngx_tm_wday_t) wday;
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337 }
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