Mercurial > hg > nginx-quic
annotate src/core/ngx_times.c @ 8899:70365b6fe5f4
Misc: win32 sources now preserved in release tarballs.
This makes it possible to build nginx under Windows from release tarballs
instead of using source code repository.
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Mon, 20 Jun 2022 19:30:50 +0300 |
parents | 9e7de0547f09 |
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rev | line source |
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441
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1 |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
4412 | 4 * Copyright (C) Nginx, Inc. |
441
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5 */ |
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8 #include <ngx_config.h> |
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9 #include <ngx_core.h> |
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12 static ngx_msec_t ngx_monotonic_time(time_t sec, ngx_uint_t msec); |
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15 /* |
563 | 16 * The time may be updated by signal handler or by several threads. |
17 * The time update operations are rare and require to hold the ngx_time_lock. | |
18 * The time read operations are frequent, so they are lock-free and get time | |
19 * values and strings from the current slot. Thus thread may get the corrupted | |
20 * values only if it is preempted while copying and then it is not scheduled | |
21 * to run more than NGX_TIME_SLOTS seconds. | |
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22 */ |
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23 |
563 | 24 #define NGX_TIME_SLOTS 64 |
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25 |
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26 static ngx_uint_t slot; |
563 | 27 static ngx_atomic_t ngx_time_lock; |
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28 |
563 | 29 volatile ngx_msec_t ngx_current_msec; |
30 volatile ngx_time_t *ngx_cached_time; | |
31 volatile ngx_str_t ngx_cached_err_log_time; | |
32 volatile ngx_str_t ngx_cached_http_time; | |
33 volatile ngx_str_t ngx_cached_http_log_time; | |
3873 | 34 volatile ngx_str_t ngx_cached_http_log_iso8601; |
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35 volatile ngx_str_t ngx_cached_syslog_time; |
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36 |
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37 #if !(NGX_WIN32) |
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38 |
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39 /* |
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40 * localtime() and localtime_r() are not Async-Signal-Safe functions, therefore, |
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41 * they must not be called by a signal handler, so we use the cached |
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42 * GMT offset value. Fortunately the value is changed only two times a year. |
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43 */ |
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44 |
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45 static ngx_int_t cached_gmtoff; |
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46 #endif |
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47 |
563 | 48 static ngx_time_t cached_time[NGX_TIME_SLOTS]; |
49 static u_char cached_err_log_time[NGX_TIME_SLOTS] | |
50 [sizeof("1970/09/28 12:00:00")]; | |
51 static u_char cached_http_time[NGX_TIME_SLOTS] | |
52 [sizeof("Mon, 28 Sep 1970 06:00:00 GMT")]; | |
53 static u_char cached_http_log_time[NGX_TIME_SLOTS] | |
54 [sizeof("28/Sep/1970:12:00:00 +0600")]; | |
3873 | 55 static u_char cached_http_log_iso8601[NGX_TIME_SLOTS] |
56 [sizeof("1970-09-28T12:00:00+06:00")]; | |
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57 static u_char cached_syslog_time[NGX_TIME_SLOTS] |
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58 [sizeof("Sep 28 12:00:00")]; |
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59 |
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61 static char *week[] = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" }; |
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62 static char *months[] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun", |
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63 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" }; |
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64 |
501 | 65 void |
66 ngx_time_init(void) | |
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67 { |
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68 ngx_cached_err_log_time.len = sizeof("1970/09/28 12:00:00") - 1; |
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69 ngx_cached_http_time.len = sizeof("Mon, 28 Sep 1970 06:00:00 GMT") - 1; |
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70 ngx_cached_http_log_time.len = sizeof("28/Sep/1970:12:00:00 +0600") - 1; |
3873 | 71 ngx_cached_http_log_iso8601.len = sizeof("1970-09-28T12:00:00+06:00") - 1; |
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72 ngx_cached_syslog_time.len = sizeof("Sep 28 12:00:00") - 1; |
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73 |
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74 ngx_cached_time = &cached_time[0]; |
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75 |
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76 ngx_time_update(); |
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77 } |
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78 |
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79 |
563 | 80 void |
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81 ngx_time_update(void) |
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82 { |
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83 u_char *p0, *p1, *p2, *p3, *p4; |
563 | 84 ngx_tm_t tm, gmt; |
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85 time_t sec; |
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86 ngx_uint_t msec; |
563 | 87 ngx_time_t *tp; |
88 struct timeval tv; | |
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89 |
563 | 90 if (!ngx_trylock(&ngx_time_lock)) { |
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91 return; |
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92 } |
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93 |
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94 ngx_gettimeofday(&tv); |
563 | 95 |
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96 sec = tv.tv_sec; |
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97 msec = tv.tv_usec / 1000; |
563 | 98 |
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99 ngx_current_msec = ngx_monotonic_time(sec, msec); |
563 | 100 |
101 tp = &cached_time[slot]; | |
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102 |
563 | 103 if (tp->sec == sec) { |
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104 tp->msec = msec; |
563 | 105 ngx_unlock(&ngx_time_lock); |
106 return; | |
107 } | |
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108 |
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109 if (slot == NGX_TIME_SLOTS - 1) { |
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110 slot = 0; |
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111 } else { |
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112 slot++; |
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113 } |
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114 |
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115 tp = &cached_time[slot]; |
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116 |
563 | 117 tp->sec = sec; |
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118 tp->msec = msec; |
563 | 119 |
120 ngx_gmtime(sec, &gmt); | |
181
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121 |
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123 p0 = &cached_http_time[slot][0]; |
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124 |
563 | 125 (void) ngx_sprintf(p0, "%s, %02d %s %4d %02d:%02d:%02d GMT", |
126 week[gmt.ngx_tm_wday], gmt.ngx_tm_mday, | |
127 months[gmt.ngx_tm_mon - 1], gmt.ngx_tm_year, | |
128 gmt.ngx_tm_hour, gmt.ngx_tm_min, gmt.ngx_tm_sec); | |
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129 |
469 | 130 #if (NGX_HAVE_GETTIMEZONE) |
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131 |
563 | 132 tp->gmtoff = ngx_gettimezone(); |
133 ngx_gmtime(sec + tp->gmtoff * 60, &tm); | |
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134 |
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135 #elif (NGX_HAVE_GMTOFF) |
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136 |
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137 ngx_localtime(sec, &tm); |
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138 cached_gmtoff = (ngx_int_t) (tm.ngx_tm_gmtoff / 60); |
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139 tp->gmtoff = cached_gmtoff; |
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140 |
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141 #else |
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142 |
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143 ngx_localtime(sec, &tm); |
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144 cached_gmtoff = ngx_timezone(tm.ngx_tm_isdst); |
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145 tp->gmtoff = cached_gmtoff; |
178
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146 |
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147 #endif |
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148 |
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149 |
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150 p1 = &cached_err_log_time[slot][0]; |
323
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151 |
563 | 152 (void) ngx_sprintf(p1, "%4d/%02d/%02d %02d:%02d:%02d", |
517 | 153 tm.ngx_tm_year, tm.ngx_tm_mon, |
154 tm.ngx_tm_mday, tm.ngx_tm_hour, | |
155 tm.ngx_tm_min, tm.ngx_tm_sec); | |
182
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156 |
323
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157 |
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158 p2 = &cached_http_log_time[slot][0]; |
323
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159 |
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160 (void) ngx_sprintf(p2, "%02d/%s/%d:%02d:%02d:%02d %c%02i%02i", |
517 | 161 tm.ngx_tm_mday, months[tm.ngx_tm_mon - 1], |
162 tm.ngx_tm_year, tm.ngx_tm_hour, | |
163 tm.ngx_tm_min, tm.ngx_tm_sec, | |
563 | 164 tp->gmtoff < 0 ? '-' : '+', |
165 ngx_abs(tp->gmtoff / 60), ngx_abs(tp->gmtoff % 60)); | |
323
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166 |
3873 | 167 p3 = &cached_http_log_iso8601[slot][0]; |
168 | |
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169 (void) ngx_sprintf(p3, "%4d-%02d-%02dT%02d:%02d:%02d%c%02i:%02i", |
3873 | 170 tm.ngx_tm_year, tm.ngx_tm_mon, |
171 tm.ngx_tm_mday, tm.ngx_tm_hour, | |
172 tm.ngx_tm_min, tm.ngx_tm_sec, | |
173 tp->gmtoff < 0 ? '-' : '+', | |
174 ngx_abs(tp->gmtoff / 60), ngx_abs(tp->gmtoff % 60)); | |
175 | |
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176 p4 = &cached_syslog_time[slot][0]; |
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177 |
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178 (void) ngx_sprintf(p4, "%s %2d %02d:%02d:%02d", |
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179 months[tm.ngx_tm_mon - 1], tm.ngx_tm_mday, |
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180 tm.ngx_tm_hour, tm.ngx_tm_min, tm.ngx_tm_sec); |
266
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181 |
563 | 182 ngx_memory_barrier(); |
266
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183 |
563 | 184 ngx_cached_time = tp; |
185 ngx_cached_http_time.data = p0; | |
186 ngx_cached_err_log_time.data = p1; | |
187 ngx_cached_http_log_time.data = p2; | |
3873 | 188 ngx_cached_http_log_iso8601.data = p3; |
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189 ngx_cached_syslog_time.data = p4; |
563 | 190 |
191 ngx_unlock(&ngx_time_lock); | |
178
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192 } |
182
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193 |
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194 |
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195 static ngx_msec_t |
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196 ngx_monotonic_time(time_t sec, ngx_uint_t msec) |
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197 { |
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198 #if (NGX_HAVE_CLOCK_MONOTONIC) |
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199 struct timespec ts; |
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200 |
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201 #if defined(CLOCK_MONOTONIC_FAST) |
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202 clock_gettime(CLOCK_MONOTONIC_FAST, &ts); |
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203 #else |
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204 clock_gettime(CLOCK_MONOTONIC, &ts); |
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205 #endif |
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206 |
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207 sec = ts.tv_sec; |
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208 msec = ts.tv_nsec / 1000000; |
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209 |
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210 #endif |
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211 |
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212 return (ngx_msec_t) sec * 1000 + msec; |
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213 } |
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214 |
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215 |
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216 #if !(NGX_WIN32) |
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217 |
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218 void |
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219 ngx_time_sigsafe_update(void) |
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220 { |
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221 u_char *p, *p2; |
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222 ngx_tm_t tm; |
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223 time_t sec; |
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224 ngx_time_t *tp; |
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225 struct timeval tv; |
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226 |
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227 if (!ngx_trylock(&ngx_time_lock)) { |
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228 return; |
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229 } |
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230 |
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231 ngx_gettimeofday(&tv); |
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232 |
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233 sec = tv.tv_sec; |
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234 |
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235 tp = &cached_time[slot]; |
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236 |
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237 if (tp->sec == sec) { |
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238 ngx_unlock(&ngx_time_lock); |
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239 return; |
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240 } |
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241 |
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242 if (slot == NGX_TIME_SLOTS - 1) { |
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243 slot = 0; |
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244 } else { |
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245 slot++; |
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246 } |
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247 |
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248 tp = &cached_time[slot]; |
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249 |
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250 tp->sec = 0; |
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251 |
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252 ngx_gmtime(sec + cached_gmtoff * 60, &tm); |
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253 |
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254 p = &cached_err_log_time[slot][0]; |
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255 |
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256 (void) ngx_sprintf(p, "%4d/%02d/%02d %02d:%02d:%02d", |
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257 tm.ngx_tm_year, tm.ngx_tm_mon, |
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258 tm.ngx_tm_mday, tm.ngx_tm_hour, |
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259 tm.ngx_tm_min, tm.ngx_tm_sec); |
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260 |
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261 p2 = &cached_syslog_time[slot][0]; |
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262 |
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263 (void) ngx_sprintf(p2, "%s %2d %02d:%02d:%02d", |
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264 months[tm.ngx_tm_mon - 1], tm.ngx_tm_mday, |
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265 tm.ngx_tm_hour, tm.ngx_tm_min, tm.ngx_tm_sec); |
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266 |
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267 ngx_memory_barrier(); |
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268 |
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269 ngx_cached_err_log_time.data = p; |
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270 ngx_cached_syslog_time.data = p2; |
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271 |
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272 ngx_unlock(&ngx_time_lock); |
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273 } |
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274 |
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275 #endif |
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276 |
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277 |
501 | 278 u_char * |
279 ngx_http_time(u_char *buf, time_t t) | |
182
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280 { |
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281 ngx_tm_t tm; |
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282 |
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283 ngx_gmtime(t, &tm); |
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284 |
455 | 285 return ngx_sprintf(buf, "%s, %02d %s %4d %02d:%02d:%02d GMT", |
286 week[tm.ngx_tm_wday], | |
287 tm.ngx_tm_mday, | |
288 months[tm.ngx_tm_mon - 1], | |
289 tm.ngx_tm_year, | |
290 tm.ngx_tm_hour, | |
291 tm.ngx_tm_min, | |
292 tm.ngx_tm_sec); | |
409
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293 } |
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294 |
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295 |
501 | 296 u_char * |
297 ngx_http_cookie_time(u_char *buf, time_t t) | |
409
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298 { |
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299 ngx_tm_t tm; |
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300 |
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301 ngx_gmtime(t, &tm); |
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302 |
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303 /* |
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304 * Netscape 3.x does not understand 4-digit years at all and |
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305 * 2-digit years more than "37" |
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306 */ |
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307 |
455 | 308 return ngx_sprintf(buf, |
309 (tm.ngx_tm_year > 2037) ? | |
310 "%s, %02d-%s-%d %02d:%02d:%02d GMT": | |
311 "%s, %02d-%s-%02d %02d:%02d:%02d GMT", | |
312 week[tm.ngx_tm_wday], | |
313 tm.ngx_tm_mday, | |
314 months[tm.ngx_tm_mon - 1], | |
315 (tm.ngx_tm_year > 2037) ? tm.ngx_tm_year: | |
316 tm.ngx_tm_year % 100, | |
317 tm.ngx_tm_hour, | |
318 tm.ngx_tm_min, | |
319 tm.ngx_tm_sec); | |
182
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320 } |
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321 |
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322 |
501 | 323 void |
324 ngx_gmtime(time_t t, ngx_tm_t *tp) | |
182
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325 { |
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326 ngx_int_t yday; |
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327 ngx_uint_t sec, min, hour, mday, mon, year, wday, days, leap; |
182
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328 |
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329 /* the calculation is valid for positive time_t only */ |
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330 |
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331 if (t < 0) { |
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332 t = 0; |
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333 } |
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334 |
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335 days = t / 86400; |
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336 sec = t % 86400; |
182
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337 |
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338 /* |
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339 * no more than 4 year digits supported, |
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340 * truncate to December 31, 9999, 23:59:59 |
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341 */ |
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342 |
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343 if (days > 2932896) { |
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344 days = 2932896; |
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345 sec = 86399; |
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346 } |
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347 |
4499
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348 /* January 1, 1970 was Thursday */ |
1970
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349 |
182
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350 wday = (4 + days) % 7; |
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351 |
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352 hour = sec / 3600; |
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353 sec %= 3600; |
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354 min = sec / 60; |
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355 sec %= 60; |
182
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356 |
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357 /* |
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358 * the algorithm based on Gauss' formula, |
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359 * see src/core/ngx_parse_time.c |
1970
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360 */ |
208
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361 |
1970
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362 /* days since March 1, 1 BC */ |
182
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363 days = days - (31 + 28) + 719527; |
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364 |
1970
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365 /* |
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366 * The "days" should be adjusted to 1 only, however, some March 1st's go |
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367 * to previous year, so we adjust them to 2. This causes also shift of the |
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368 * last February days to next year, but we catch the case when "yday" |
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369 * becomes negative. |
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370 */ |
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371 |
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372 year = (days + 2) * 400 / (365 * 400 + 100 - 4 + 1); |
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373 |
182
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374 yday = days - (365 * year + year / 4 - year / 100 + year / 400); |
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375 |
1970
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376 if (yday < 0) { |
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377 leap = (year % 4 == 0) && (year % 100 || (year % 400 == 0)); |
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378 yday = 365 + leap + yday; |
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379 year--; |
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380 } |
182
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381 |
1970
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382 /* |
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383 * The empirical formula that maps "yday" to month. |
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384 * There are at least 10 variants, some of them are: |
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385 * mon = (yday + 31) * 15 / 459 |
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386 * mon = (yday + 31) * 17 / 520 |
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387 * mon = (yday + 31) * 20 / 612 |
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388 */ |
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389 |
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390 mon = (yday + 31) * 10 / 306; |
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391 |
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392 /* the Gauss' formula that evaluates days before the month */ |
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393 |
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394 mday = yday - (367 * mon / 12 - 30) + 1; |
182
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395 |
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396 if (yday >= 306) { |
441
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397 |
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398 year++; |
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399 mon -= 10; |
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400 |
297
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401 /* |
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402 * there is no "yday" in Win32 SYSTEMTIME |
297
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403 * |
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404 * yday -= 306; |
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405 */ |
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406 |
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407 } else { |
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408 |
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409 mon += 2; |
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410 |
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411 /* |
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412 * there is no "yday" in Win32 SYSTEMTIME |
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413 * |
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414 * yday += 31 + 28 + leap; |
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415 */ |
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416 } |
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417 |
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418 tp->ngx_tm_sec = (ngx_tm_sec_t) sec; |
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419 tp->ngx_tm_min = (ngx_tm_min_t) min; |
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420 tp->ngx_tm_hour = (ngx_tm_hour_t) hour; |
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421 tp->ngx_tm_mday = (ngx_tm_mday_t) mday; |
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422 tp->ngx_tm_mon = (ngx_tm_mon_t) mon; |
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423 tp->ngx_tm_year = (ngx_tm_year_t) year; |
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424 tp->ngx_tm_wday = (ngx_tm_wday_t) wday; |
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425 } |
2162 | 426 |
427 | |
428 time_t | |
429 ngx_next_time(time_t when) | |
430 { | |
431 time_t now, next; | |
432 struct tm tm; | |
433 | |
434 now = ngx_time(); | |
435 | |
436 ngx_libc_localtime(now, &tm); | |
437 | |
438 tm.tm_hour = (int) (when / 3600); | |
439 when %= 3600; | |
440 tm.tm_min = (int) (when / 60); | |
441 tm.tm_sec = (int) (when % 60); | |
442 | |
443 next = mktime(&tm); | |
444 | |
445 if (next == -1) { | |
446 return -1; | |
447 } | |
448 | |
449 if (next - now > 0) { | |
450 return next; | |
451 } | |
452 | |
453 tm.tm_mday++; | |
454 | |
455 /* mktime() should normalize a date (Jan 32, etc) */ | |
456 | |
457 next = mktime(&tm); | |
458 | |
459 if (next != -1) { | |
460 return next; | |
461 } | |
462 | |
463 return -1; | |
464 } |