Mercurial > hg > nginx
annotate src/core/ngx_times.c @ 3474:d4c4cfdffe30
*) use previously cached GMT offset value to update time from a signal handler
*) change ngx_time_update() interface since there are no notification methods
those return time
author | Igor Sysoev <igor@sysoev.ru> |
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date | Sat, 13 Mar 2010 18:08:07 +0000 |
parents | bf38420c9e25 |
children | ab353d7dc182 |
rev | line source |
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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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7 #include <ngx_config.h> |
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8 #include <ngx_core.h> |
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11 /* |
563 | 12 * The time may be updated by signal handler or by several threads. |
13 * The time update operations are rare and require to hold the ngx_time_lock. | |
14 * The time read operations are frequent, so they are lock-free and get time | |
15 * values and strings from the current slot. Thus thread may get the corrupted | |
16 * values only if it is preempted while copying and then it is not scheduled | |
17 * to run more than NGX_TIME_SLOTS seconds. | |
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18 */ |
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19 |
563 | 20 #define NGX_TIME_SLOTS 64 |
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21 |
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22 static ngx_uint_t slot; |
563 | 23 static ngx_atomic_t ngx_time_lock; |
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24 |
563 | 25 volatile ngx_msec_t ngx_current_msec; |
26 volatile ngx_time_t *ngx_cached_time; | |
27 volatile ngx_str_t ngx_cached_err_log_time; | |
28 volatile ngx_str_t ngx_cached_http_time; | |
29 volatile ngx_str_t ngx_cached_http_log_time; | |
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30 |
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31 #if !(NGX_HAVE_GETTIMEZONE) |
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32 |
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33 /* |
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34 * locatime() and localtime_r() are not Async-Signal-Safe functions, therefore, |
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35 * if ngx_time_update() is called by signal handler, it uses the cached |
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36 * GMT offset value. Fortunately the value is changed only two times a year. |
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37 */ |
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38 |
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39 static ngx_int_t cached_gmtoff; |
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40 #endif |
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41 |
563 | 42 static ngx_time_t cached_time[NGX_TIME_SLOTS]; |
43 static u_char cached_err_log_time[NGX_TIME_SLOTS] | |
44 [sizeof("1970/09/28 12:00:00")]; | |
45 static u_char cached_http_time[NGX_TIME_SLOTS] | |
46 [sizeof("Mon, 28 Sep 1970 06:00:00 GMT")]; | |
47 static u_char cached_http_log_time[NGX_TIME_SLOTS] | |
48 [sizeof("28/Sep/1970:12:00:00 +0600")]; | |
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49 |
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51 static char *week[] = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" }; |
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52 static char *months[] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun", |
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53 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" }; |
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54 |
501 | 55 void |
56 ngx_time_init(void) | |
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57 { |
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58 ngx_cached_err_log_time.len = sizeof("1970/09/28 12:00:00") - 1; |
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59 ngx_cached_http_time.len = sizeof("Mon, 28 Sep 1970 06:00:00 GMT") - 1; |
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60 ngx_cached_http_log_time.len = sizeof("28/Sep/1970:12:00:00 +0600") - 1; |
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62 ngx_cached_time = &cached_time[0]; |
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63 |
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64 ngx_time_update(0); |
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65 } |
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67 |
563 | 68 void |
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69 ngx_time_update(ngx_uint_t use_cached_gmtoff) |
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70 { |
563 | 71 u_char *p0, *p1, *p2; |
72 ngx_tm_t tm, gmt; | |
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73 time_t sec; |
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74 ngx_uint_t msec; |
563 | 75 ngx_time_t *tp; |
76 struct timeval tv; | |
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77 |
563 | 78 if (!ngx_trylock(&ngx_time_lock)) { |
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79 return; |
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80 } |
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81 |
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82 ngx_gettimeofday(&tv); |
563 | 83 |
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84 sec = tv.tv_sec; |
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85 msec = tv.tv_usec / 1000; |
563 | 86 |
87 ngx_current_msec = (ngx_msec_t) sec * 1000 + msec; | |
88 | |
89 tp = &cached_time[slot]; | |
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90 |
563 | 91 if (tp->sec == sec) { |
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92 tp->msec = msec; |
563 | 93 ngx_unlock(&ngx_time_lock); |
94 return; | |
95 } | |
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97 if (slot == NGX_TIME_SLOTS - 1) { |
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98 slot = 0; |
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99 } else { |
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100 slot++; |
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101 } |
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102 |
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103 tp = &cached_time[slot]; |
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104 |
563 | 105 tp->sec = sec; |
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106 tp->msec = msec; |
563 | 107 |
108 ngx_gmtime(sec, &gmt); | |
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111 p0 = &cached_http_time[slot][0]; |
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112 |
563 | 113 (void) ngx_sprintf(p0, "%s, %02d %s %4d %02d:%02d:%02d GMT", |
114 week[gmt.ngx_tm_wday], gmt.ngx_tm_mday, | |
115 months[gmt.ngx_tm_mon - 1], gmt.ngx_tm_year, | |
116 gmt.ngx_tm_hour, gmt.ngx_tm_min, gmt.ngx_tm_sec); | |
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117 |
469 | 118 #if (NGX_HAVE_GETTIMEZONE) |
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119 |
563 | 120 tp->gmtoff = ngx_gettimezone(); |
121 ngx_gmtime(sec + tp->gmtoff * 60, &tm); | |
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122 |
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123 #else |
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124 |
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125 if (use_cached_gmtoff) { |
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126 ngx_gmtime(sec + cached_gmtoff * 60, &tm); |
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127 |
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128 } else { |
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129 ngx_localtime(sec, &tm); |
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130 |
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131 #if (NGX_HAVE_GMTOFF) |
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132 cached_gmtoff = (ngx_int_t) (tm.ngx_tm_gmtoff / 60); |
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133 #else |
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134 cached_gmtoff = ngx_timezone(tm.ngx_tm_isdst); |
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135 #endif |
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136 |
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137 } |
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138 |
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139 tp->gmtoff = cached_gmtoff; |
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141 #endif |
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142 |
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143 |
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144 p1 = &cached_err_log_time[slot][0]; |
323
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145 |
563 | 146 (void) ngx_sprintf(p1, "%4d/%02d/%02d %02d:%02d:%02d", |
517 | 147 tm.ngx_tm_year, tm.ngx_tm_mon, |
148 tm.ngx_tm_mday, tm.ngx_tm_hour, | |
149 tm.ngx_tm_min, tm.ngx_tm_sec); | |
182
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150 |
323
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151 |
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152 p2 = &cached_http_log_time[slot][0]; |
323
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153 |
563 | 154 (void) ngx_sprintf(p2, "%02d/%s/%d:%02d:%02d:%02d %c%02d%02d", |
517 | 155 tm.ngx_tm_mday, months[tm.ngx_tm_mon - 1], |
156 tm.ngx_tm_year, tm.ngx_tm_hour, | |
157 tm.ngx_tm_min, tm.ngx_tm_sec, | |
563 | 158 tp->gmtoff < 0 ? '-' : '+', |
159 ngx_abs(tp->gmtoff / 60), ngx_abs(tp->gmtoff % 60)); | |
323
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160 |
266
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161 |
563 | 162 ngx_memory_barrier(); |
266
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163 |
563 | 164 ngx_cached_time = tp; |
165 ngx_cached_http_time.data = p0; | |
166 ngx_cached_err_log_time.data = p1; | |
167 ngx_cached_http_log_time.data = p2; | |
168 | |
169 ngx_unlock(&ngx_time_lock); | |
178
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170 } |
182
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171 |
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172 |
501 | 173 u_char * |
174 ngx_http_time(u_char *buf, time_t t) | |
182
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175 { |
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176 ngx_tm_t tm; |
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177 |
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178 ngx_gmtime(t, &tm); |
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179 |
455 | 180 return ngx_sprintf(buf, "%s, %02d %s %4d %02d:%02d:%02d GMT", |
181 week[tm.ngx_tm_wday], | |
182 tm.ngx_tm_mday, | |
183 months[tm.ngx_tm_mon - 1], | |
184 tm.ngx_tm_year, | |
185 tm.ngx_tm_hour, | |
186 tm.ngx_tm_min, | |
187 tm.ngx_tm_sec); | |
409
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188 } |
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189 |
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190 |
501 | 191 u_char * |
192 ngx_http_cookie_time(u_char *buf, time_t t) | |
409
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193 { |
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194 ngx_tm_t tm; |
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195 |
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196 ngx_gmtime(t, &tm); |
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197 |
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198 /* |
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199 * Netscape 3.x does not understand 4-digit years at all and |
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200 * 2-digit years more than "37" |
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201 */ |
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202 |
455 | 203 return ngx_sprintf(buf, |
204 (tm.ngx_tm_year > 2037) ? | |
205 "%s, %02d-%s-%d %02d:%02d:%02d GMT": | |
206 "%s, %02d-%s-%02d %02d:%02d:%02d GMT", | |
207 week[tm.ngx_tm_wday], | |
208 tm.ngx_tm_mday, | |
209 months[tm.ngx_tm_mon - 1], | |
210 (tm.ngx_tm_year > 2037) ? tm.ngx_tm_year: | |
211 tm.ngx_tm_year % 100, | |
212 tm.ngx_tm_hour, | |
213 tm.ngx_tm_min, | |
214 tm.ngx_tm_sec); | |
182
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215 } |
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216 |
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217 |
501 | 218 void |
219 ngx_gmtime(time_t t, ngx_tm_t *tp) | |
182
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220 { |
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221 ngx_int_t yday; |
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222 ngx_uint_t n, sec, min, hour, mday, mon, year, wday, days, leap; |
182
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223 |
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224 /* the calculation is valid for positive time_t only */ |
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225 |
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226 n = (ngx_uint_t) t; |
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227 |
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228 days = n / 86400; |
182
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229 |
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230 /* Jaunary 1, 1970 was Thursday */ |
1970
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231 |
182
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232 wday = (4 + days) % 7; |
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233 |
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234 n %= 86400; |
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235 hour = n / 3600; |
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236 n %= 3600; |
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237 min = n / 60; |
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238 sec = n % 60; |
182
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239 |
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240 /* |
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241 * the algorithm based on Gauss' formula, |
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242 * see src/http/ngx_http_parse_time.c |
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243 */ |
208
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244 |
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245 /* days since March 1, 1 BC */ |
182
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246 days = days - (31 + 28) + 719527; |
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247 |
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248 /* |
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249 * The "days" should be adjusted to 1 only, however, some March 1st's go |
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250 * to previous year, so we adjust them to 2. This causes also shift of the |
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251 * last Feburary days to next year, but we catch the case when "yday" |
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252 * becomes negative. |
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253 */ |
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254 |
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255 year = (days + 2) * 400 / (365 * 400 + 100 - 4 + 1); |
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256 |
182
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257 yday = days - (365 * year + year / 4 - year / 100 + year / 400); |
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258 |
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259 if (yday < 0) { |
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260 leap = (year % 4 == 0) && (year % 100 || (year % 400 == 0)); |
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261 yday = 365 + leap + yday; |
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262 year--; |
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263 } |
182
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264 |
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265 /* |
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266 * The empirical formula that maps "yday" to month. |
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267 * There are at least 10 variants, some of them are: |
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268 * mon = (yday + 31) * 15 / 459 |
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269 * mon = (yday + 31) * 17 / 520 |
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270 * mon = (yday + 31) * 20 / 612 |
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271 */ |
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272 |
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273 mon = (yday + 31) * 10 / 306; |
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274 |
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275 /* the Gauss' formula that evaluates days before the month */ |
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276 |
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277 mday = yday - (367 * mon / 12 - 30) + 1; |
182
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278 |
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279 if (yday >= 306) { |
441
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280 |
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281 year++; |
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282 mon -= 10; |
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283 |
297
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284 /* |
324
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285 * there is no "yday" in Win32 SYSTEMTIME |
297
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286 * |
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287 * yday -= 306; |
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288 */ |
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289 |
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290 } else { |
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291 |
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292 mon += 2; |
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293 |
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294 /* |
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295 * there is no "yday" in Win32 SYSTEMTIME |
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296 * |
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297 * yday += 31 + 28 + leap; |
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298 */ |
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299 } |
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300 |
290
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301 tp->ngx_tm_sec = (ngx_tm_sec_t) sec; |
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302 tp->ngx_tm_min = (ngx_tm_min_t) min; |
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303 tp->ngx_tm_hour = (ngx_tm_hour_t) hour; |
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304 tp->ngx_tm_mday = (ngx_tm_mday_t) mday; |
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305 tp->ngx_tm_mon = (ngx_tm_mon_t) mon; |
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306 tp->ngx_tm_year = (ngx_tm_year_t) year; |
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307 tp->ngx_tm_wday = (ngx_tm_wday_t) wday; |
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308 } |
2162 | 309 |
310 | |
311 time_t | |
312 ngx_next_time(time_t when) | |
313 { | |
314 time_t now, next; | |
315 struct tm tm; | |
316 | |
317 now = ngx_time(); | |
318 | |
319 ngx_libc_localtime(now, &tm); | |
320 | |
321 tm.tm_hour = (int) (when / 3600); | |
322 when %= 3600; | |
323 tm.tm_min = (int) (when / 60); | |
324 tm.tm_sec = (int) (when % 60); | |
325 | |
326 next = mktime(&tm); | |
327 | |
328 if (next == -1) { | |
329 return -1; | |
330 } | |
331 | |
332 if (next - now > 0) { | |
333 return next; | |
334 } | |
335 | |
336 tm.tm_mday++; | |
337 | |
338 /* mktime() should normalize a date (Jan 32, etc) */ | |
339 | |
340 next = mktime(&tm); | |
341 | |
342 if (next != -1) { | |
343 return next; | |
344 } | |
345 | |
346 return -1; | |
347 } |