Mercurial > hg > nginx
annotate src/core/ngx_times.c @ 4782:e23892a0c917
Fixed possible use of old cached times if runtime went backwards.
If ngx_time_sigsafe_update() updated only ngx_cached_err_log_time, and
then clock was adjusted backwards, the cached_time[slot].sec might
accidentally match current seconds on next ngx_time_update() call,
resulting in various cached times not being updated.
Fix is to clear the cached_time[slot].sec to explicitly mark cached times
are stale and need updating.
| author | Maxim Dounin <mdounin@mdounin.ru> |
|---|---|
| date | Fri, 03 Aug 2012 09:10:39 +0000 |
| parents | 67653855682e |
| children | 777202558122 |
| rev | line source |
|---|---|
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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. |
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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 /* |
| 563 | 13 * The time may be updated by signal handler or by several threads. |
| 14 * The time update operations are rare and require to hold the ngx_time_lock. | |
| 15 * The time read operations are frequent, so they are lock-free and get time | |
| 16 * values and strings from the current slot. Thus thread may get the corrupted | |
| 17 * values only if it is preempted while copying and then it is not scheduled | |
| 18 * to run more than NGX_TIME_SLOTS seconds. | |
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19 */ |
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20 |
| 563 | 21 #define NGX_TIME_SLOTS 64 |
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22 |
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23 static ngx_uint_t slot; |
| 563 | 24 static ngx_atomic_t ngx_time_lock; |
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25 |
| 563 | 26 volatile ngx_msec_t ngx_current_msec; |
| 27 volatile ngx_time_t *ngx_cached_time; | |
| 28 volatile ngx_str_t ngx_cached_err_log_time; | |
| 29 volatile ngx_str_t ngx_cached_http_time; | |
| 30 volatile ngx_str_t ngx_cached_http_log_time; | |
| 3873 | 31 volatile ngx_str_t ngx_cached_http_log_iso8601; |
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32 |
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33 #if !(NGX_WIN32) |
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34 |
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35 /* |
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36 * localtime() and localtime_r() are not Async-Signal-Safe functions, therefore, |
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37 * they must not be called by a signal handler, so we use the cached |
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38 * GMT offset value. Fortunately the value is changed only two times a year. |
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39 */ |
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40 |
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41 static ngx_int_t cached_gmtoff; |
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42 #endif |
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43 |
| 563 | 44 static ngx_time_t cached_time[NGX_TIME_SLOTS]; |
| 45 static u_char cached_err_log_time[NGX_TIME_SLOTS] | |
| 46 [sizeof("1970/09/28 12:00:00")]; | |
| 47 static u_char cached_http_time[NGX_TIME_SLOTS] | |
| 48 [sizeof("Mon, 28 Sep 1970 06:00:00 GMT")]; | |
| 49 static u_char cached_http_log_time[NGX_TIME_SLOTS] | |
| 50 [sizeof("28/Sep/1970:12:00:00 +0600")]; | |
| 3873 | 51 static u_char cached_http_log_iso8601[NGX_TIME_SLOTS] |
| 52 [sizeof("1970-09-28T12:00:00+06:00")]; | |
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55 static char *week[] = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" }; |
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56 static char *months[] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun", |
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57 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" }; |
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58 |
| 501 | 59 void |
| 60 ngx_time_init(void) | |
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61 { |
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62 ngx_cached_err_log_time.len = sizeof("1970/09/28 12:00:00") - 1; |
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63 ngx_cached_http_time.len = sizeof("Mon, 28 Sep 1970 06:00:00 GMT") - 1; |
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64 ngx_cached_http_log_time.len = sizeof("28/Sep/1970:12:00:00 +0600") - 1; |
| 3873 | 65 ngx_cached_http_log_iso8601.len = sizeof("1970-09-28T12:00:00+06:00") - 1; |
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66 |
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67 ngx_cached_time = &cached_time[0]; |
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68 |
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69 ngx_time_update(); |
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70 } |
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71 |
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72 |
| 563 | 73 void |
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74 ngx_time_update(void) |
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75 { |
| 3873 | 76 u_char *p0, *p1, *p2, *p3; |
| 563 | 77 ngx_tm_t tm, gmt; |
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78 time_t sec; |
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79 ngx_uint_t msec; |
| 563 | 80 ngx_time_t *tp; |
| 81 struct timeval tv; | |
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82 |
| 563 | 83 if (!ngx_trylock(&ngx_time_lock)) { |
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84 return; |
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85 } |
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86 |
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87 ngx_gettimeofday(&tv); |
| 563 | 88 |
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89 sec = tv.tv_sec; |
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90 msec = tv.tv_usec / 1000; |
| 563 | 91 |
| 92 ngx_current_msec = (ngx_msec_t) sec * 1000 + msec; | |
| 93 | |
| 94 tp = &cached_time[slot]; | |
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95 |
| 563 | 96 if (tp->sec == sec) { |
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97 tp->msec = msec; |
| 563 | 98 ngx_unlock(&ngx_time_lock); |
| 99 return; | |
| 100 } | |
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101 |
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102 if (slot == NGX_TIME_SLOTS - 1) { |
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103 slot = 0; |
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104 } else { |
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105 slot++; |
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106 } |
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107 |
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108 tp = &cached_time[slot]; |
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109 |
| 563 | 110 tp->sec = sec; |
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111 tp->msec = msec; |
| 563 | 112 |
| 113 ngx_gmtime(sec, &gmt); | |
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116 p0 = &cached_http_time[slot][0]; |
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117 |
| 563 | 118 (void) ngx_sprintf(p0, "%s, %02d %s %4d %02d:%02d:%02d GMT", |
| 119 week[gmt.ngx_tm_wday], gmt.ngx_tm_mday, | |
| 120 months[gmt.ngx_tm_mon - 1], gmt.ngx_tm_year, | |
| 121 gmt.ngx_tm_hour, gmt.ngx_tm_min, gmt.ngx_tm_sec); | |
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122 |
| 469 | 123 #if (NGX_HAVE_GETTIMEZONE) |
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124 |
| 563 | 125 tp->gmtoff = ngx_gettimezone(); |
| 126 ngx_gmtime(sec + tp->gmtoff * 60, &tm); | |
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127 |
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128 #elif (NGX_HAVE_GMTOFF) |
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129 |
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130 ngx_localtime(sec, &tm); |
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131 cached_gmtoff = (ngx_int_t) (tm.ngx_tm_gmtoff / 60); |
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132 tp->gmtoff = cached_gmtoff; |
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133 |
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134 #else |
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135 |
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136 ngx_localtime(sec, &tm); |
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137 cached_gmtoff = ngx_timezone(tm.ngx_tm_isdst); |
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138 tp->gmtoff = cached_gmtoff; |
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178
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139 |
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140 #endif |
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141 |
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142 |
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143 p1 = &cached_err_log_time[slot][0]; |
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144 |
| 563 | 145 (void) ngx_sprintf(p1, "%4d/%02d/%02d %02d:%02d:%02d", |
| 517 | 146 tm.ngx_tm_year, tm.ngx_tm_mon, |
| 147 tm.ngx_tm_mday, tm.ngx_tm_hour, | |
| 148 tm.ngx_tm_min, tm.ngx_tm_sec); | |
|
182
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149 |
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150 |
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151 p2 = &cached_http_log_time[slot][0]; |
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152 |
| 563 | 153 (void) ngx_sprintf(p2, "%02d/%s/%d:%02d:%02d:%02d %c%02d%02d", |
| 517 | 154 tm.ngx_tm_mday, months[tm.ngx_tm_mon - 1], |
| 155 tm.ngx_tm_year, tm.ngx_tm_hour, | |
| 156 tm.ngx_tm_min, tm.ngx_tm_sec, | |
| 563 | 157 tp->gmtoff < 0 ? '-' : '+', |
| 158 ngx_abs(tp->gmtoff / 60), ngx_abs(tp->gmtoff % 60)); | |
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159 |
| 3873 | 160 p3 = &cached_http_log_iso8601[slot][0]; |
| 161 | |
| 162 (void) ngx_sprintf(p3, "%4d-%02d-%02dT%02d:%02d:%02d%c%02d:%02d", | |
| 163 tm.ngx_tm_year, tm.ngx_tm_mon, | |
| 164 tm.ngx_tm_mday, tm.ngx_tm_hour, | |
| 165 tm.ngx_tm_min, tm.ngx_tm_sec, | |
| 166 tp->gmtoff < 0 ? '-' : '+', | |
| 167 ngx_abs(tp->gmtoff / 60), ngx_abs(tp->gmtoff % 60)); | |
| 168 | |
|
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169 |
| 563 | 170 ngx_memory_barrier(); |
|
266
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171 |
| 563 | 172 ngx_cached_time = tp; |
| 173 ngx_cached_http_time.data = p0; | |
| 174 ngx_cached_err_log_time.data = p1; | |
| 175 ngx_cached_http_log_time.data = p2; | |
| 3873 | 176 ngx_cached_http_log_iso8601.data = p3; |
| 563 | 177 |
| 178 ngx_unlock(&ngx_time_lock); | |
|
178
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179 } |
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182
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180 |
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181 |
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182 #if !(NGX_WIN32) |
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183 |
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184 void |
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185 ngx_time_sigsafe_update(void) |
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186 { |
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187 u_char *p; |
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188 ngx_tm_t tm; |
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189 time_t sec; |
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190 ngx_time_t *tp; |
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191 struct timeval tv; |
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192 |
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193 if (!ngx_trylock(&ngx_time_lock)) { |
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194 return; |
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195 } |
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196 |
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197 ngx_gettimeofday(&tv); |
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198 |
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199 sec = tv.tv_sec; |
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200 |
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201 tp = &cached_time[slot]; |
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202 |
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203 if (tp->sec == sec) { |
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204 ngx_unlock(&ngx_time_lock); |
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205 return; |
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206 } |
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207 |
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208 if (slot == NGX_TIME_SLOTS - 1) { |
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209 slot = 0; |
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210 } else { |
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211 slot++; |
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212 } |
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213 |
|
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214 tp = &cached_time[slot]; |
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215 |
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216 tp->sec = 0; |
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217 |
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218 ngx_gmtime(sec + cached_gmtoff * 60, &tm); |
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219 |
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220 p = &cached_err_log_time[slot][0]; |
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221 |
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222 (void) ngx_sprintf(p, "%4d/%02d/%02d %02d:%02d:%02d", |
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223 tm.ngx_tm_year, tm.ngx_tm_mon, |
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224 tm.ngx_tm_mday, tm.ngx_tm_hour, |
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225 tm.ngx_tm_min, tm.ngx_tm_sec); |
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226 |
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227 ngx_memory_barrier(); |
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228 |
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229 ngx_cached_err_log_time.data = p; |
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230 |
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231 ngx_unlock(&ngx_time_lock); |
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232 } |
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233 |
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234 #endif |
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235 |
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236 |
| 501 | 237 u_char * |
| 238 ngx_http_time(u_char *buf, time_t t) | |
|
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239 { |
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240 ngx_tm_t tm; |
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241 |
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242 ngx_gmtime(t, &tm); |
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243 |
| 455 | 244 return ngx_sprintf(buf, "%s, %02d %s %4d %02d:%02d:%02d GMT", |
| 245 week[tm.ngx_tm_wday], | |
| 246 tm.ngx_tm_mday, | |
| 247 months[tm.ngx_tm_mon - 1], | |
| 248 tm.ngx_tm_year, | |
| 249 tm.ngx_tm_hour, | |
| 250 tm.ngx_tm_min, | |
| 251 tm.ngx_tm_sec); | |
|
409
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252 } |
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253 |
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254 |
| 501 | 255 u_char * |
| 256 ngx_http_cookie_time(u_char *buf, time_t t) | |
|
409
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257 { |
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258 ngx_tm_t tm; |
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259 |
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260 ngx_gmtime(t, &tm); |
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261 |
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262 /* |
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263 * Netscape 3.x does not understand 4-digit years at all and |
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264 * 2-digit years more than "37" |
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265 */ |
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266 |
| 455 | 267 return ngx_sprintf(buf, |
| 268 (tm.ngx_tm_year > 2037) ? | |
| 269 "%s, %02d-%s-%d %02d:%02d:%02d GMT": | |
| 270 "%s, %02d-%s-%02d %02d:%02d:%02d GMT", | |
| 271 week[tm.ngx_tm_wday], | |
| 272 tm.ngx_tm_mday, | |
| 273 months[tm.ngx_tm_mon - 1], | |
| 274 (tm.ngx_tm_year > 2037) ? tm.ngx_tm_year: | |
| 275 tm.ngx_tm_year % 100, | |
| 276 tm.ngx_tm_hour, | |
| 277 tm.ngx_tm_min, | |
| 278 tm.ngx_tm_sec); | |
|
182
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279 } |
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280 |
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281 |
| 501 | 282 void |
| 283 ngx_gmtime(time_t t, ngx_tm_t *tp) | |
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284 { |
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285 ngx_int_t yday; |
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286 ngx_uint_t n, sec, min, hour, mday, mon, year, wday, days, leap; |
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287 |
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288 /* the calculation is valid for positive time_t only */ |
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289 |
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290 n = (ngx_uint_t) t; |
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291 |
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292 days = n / 86400; |
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293 |
|
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294 /* January 1, 1970 was Thursday */ |
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295 |
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296 wday = (4 + days) % 7; |
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297 |
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298 n %= 86400; |
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299 hour = n / 3600; |
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300 n %= 3600; |
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301 min = n / 60; |
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302 sec = n % 60; |
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303 |
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304 /* |
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305 * the algorithm based on Gauss' formula, |
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306 * see src/http/ngx_http_parse_time.c |
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307 */ |
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208
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308 |
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309 /* days since March 1, 1 BC */ |
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310 days = days - (31 + 28) + 719527; |
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311 |
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312 /* |
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313 * The "days" should be adjusted to 1 only, however, some March 1st's go |
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314 * to previous year, so we adjust them to 2. This causes also shift of the |
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315 * last February days to next year, but we catch the case when "yday" |
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316 * becomes negative. |
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317 */ |
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318 |
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319 year = (days + 2) * 400 / (365 * 400 + 100 - 4 + 1); |
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320 |
|
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321 yday = days - (365 * year + year / 4 - year / 100 + year / 400); |
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322 |
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323 if (yday < 0) { |
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324 leap = (year % 4 == 0) && (year % 100 || (year % 400 == 0)); |
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325 yday = 365 + leap + yday; |
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326 year--; |
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327 } |
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328 |
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329 /* |
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330 * The empirical formula that maps "yday" to month. |
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331 * There are at least 10 variants, some of them are: |
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332 * mon = (yday + 31) * 15 / 459 |
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333 * mon = (yday + 31) * 17 / 520 |
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334 * mon = (yday + 31) * 20 / 612 |
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335 */ |
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336 |
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337 mon = (yday + 31) * 10 / 306; |
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338 |
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339 /* the Gauss' formula that evaluates days before the month */ |
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340 |
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341 mday = yday - (367 * mon / 12 - 30) + 1; |
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342 |
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343 if (yday >= 306) { |
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441
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344 |
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345 year++; |
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346 mon -= 10; |
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347 |
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297
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348 /* |
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324
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349 * there is no "yday" in Win32 SYSTEMTIME |
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350 * |
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351 * yday -= 306; |
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352 */ |
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353 |
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354 } else { |
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355 |
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356 mon += 2; |
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357 |
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358 /* |
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359 * there is no "yday" in Win32 SYSTEMTIME |
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360 * |
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361 * yday += 31 + 28 + leap; |
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362 */ |
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363 } |
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364 |
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290
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365 tp->ngx_tm_sec = (ngx_tm_sec_t) sec; |
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366 tp->ngx_tm_min = (ngx_tm_min_t) min; |
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367 tp->ngx_tm_hour = (ngx_tm_hour_t) hour; |
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368 tp->ngx_tm_mday = (ngx_tm_mday_t) mday; |
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369 tp->ngx_tm_mon = (ngx_tm_mon_t) mon; |
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370 tp->ngx_tm_year = (ngx_tm_year_t) year; |
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371 tp->ngx_tm_wday = (ngx_tm_wday_t) wday; |
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372 } |
| 2162 | 373 |
| 374 | |
| 375 time_t | |
| 376 ngx_next_time(time_t when) | |
| 377 { | |
| 378 time_t now, next; | |
| 379 struct tm tm; | |
| 380 | |
| 381 now = ngx_time(); | |
| 382 | |
| 383 ngx_libc_localtime(now, &tm); | |
| 384 | |
| 385 tm.tm_hour = (int) (when / 3600); | |
| 386 when %= 3600; | |
| 387 tm.tm_min = (int) (when / 60); | |
| 388 tm.tm_sec = (int) (when % 60); | |
| 389 | |
| 390 next = mktime(&tm); | |
| 391 | |
| 392 if (next == -1) { | |
| 393 return -1; | |
| 394 } | |
| 395 | |
| 396 if (next - now > 0) { | |
| 397 return next; | |
| 398 } | |
| 399 | |
| 400 tm.tm_mday++; | |
| 401 | |
| 402 /* mktime() should normalize a date (Jan 32, etc) */ | |
| 403 | |
| 404 next = mktime(&tm); | |
| 405 | |
| 406 if (next != -1) { | |
| 407 return next; | |
| 408 } | |
| 409 | |
| 410 return -1; | |
| 411 } |