0
|
1
|
|
2 /*
|
|
3 * Copyright (C) Igor Sysoev
|
|
4 */
|
|
5
|
|
6
|
|
7 #include <ngx_config.h>
|
|
8 #include <ngx_core.h>
|
|
9
|
|
10
|
|
11 /*
|
112
|
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.
|
0
|
18 */
|
|
19
|
112
|
20 #define NGX_TIME_SLOTS 64
|
0
|
21
|
270
|
22 static ngx_uint_t slot;
|
112
|
23 static ngx_atomic_t ngx_time_lock;
|
0
|
24
|
112
|
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;
|
0
|
30
|
112
|
31 static ngx_time_t cached_time[NGX_TIME_SLOTS];
|
|
32 static u_char cached_err_log_time[NGX_TIME_SLOTS]
|
|
33 [sizeof("1970/09/28 12:00:00")];
|
|
34 static u_char cached_http_time[NGX_TIME_SLOTS]
|
|
35 [sizeof("Mon, 28 Sep 1970 06:00:00 GMT")];
|
|
36 static u_char cached_http_log_time[NGX_TIME_SLOTS]
|
|
37 [sizeof("28/Sep/1970:12:00:00 +0600")];
|
0
|
38
|
|
39
|
|
40 static char *week[] = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };
|
|
41 static char *months[] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
|
|
42 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
|
|
43
|
50
|
44 void
|
|
45 ngx_time_init(void)
|
0
|
46 {
|
|
47 ngx_cached_err_log_time.len = sizeof("1970/09/28 12:00:00") - 1;
|
|
48 ngx_cached_http_time.len = sizeof("Mon, 28 Sep 1970 06:00:00 GMT") - 1;
|
|
49 ngx_cached_http_log_time.len = sizeof("28/Sep/1970:12:00:00 +0600") - 1;
|
|
50
|
|
51 ngx_cached_time = &cached_time[0];
|
|
52
|
10
|
53 #if !(NGX_WIN32)
|
0
|
54 tzset();
|
|
55 #endif
|
|
56
|
112
|
57 ngx_time_update(0, 0);
|
0
|
58 }
|
|
59
|
|
60
|
112
|
61 void
|
|
62 ngx_time_update(time_t sec, ngx_uint_t msec)
|
0
|
63 {
|
112
|
64 u_char *p0, *p1, *p2;
|
|
65 ngx_tm_t tm, gmt;
|
|
66 ngx_time_t *tp;
|
|
67 struct timeval tv;
|
0
|
68
|
112
|
69 if (!ngx_trylock(&ngx_time_lock)) {
|
0
|
70 return;
|
|
71 }
|
|
72
|
112
|
73 if (sec == 0) {
|
|
74 ngx_gettimeofday(&tv);
|
|
75
|
|
76 sec = tv.tv_sec;
|
|
77 msec = tv.tv_usec / 1000;
|
|
78 }
|
|
79
|
|
80 ngx_current_msec = (ngx_msec_t) sec * 1000 + msec;
|
|
81
|
|
82 tp = &cached_time[slot];
|
0
|
83
|
112
|
84 if (tp->sec == sec) {
|
262
|
85 tp->msec = msec;
|
112
|
86 ngx_unlock(&ngx_time_lock);
|
|
87 return;
|
|
88 }
|
0
|
89
|
282
|
90 if (slot == NGX_TIME_SLOTS - 1) {
|
262
|
91 slot = 0;
|
|
92 } else {
|
|
93 slot++;
|
|
94 }
|
|
95
|
|
96 tp = &cached_time[slot];
|
|
97
|
112
|
98 tp->sec = sec;
|
262
|
99 tp->msec = msec;
|
112
|
100
|
|
101 ngx_gmtime(sec, &gmt);
|
0
|
102
|
|
103
|
280
|
104 p0 = &cached_http_time[slot][0];
|
0
|
105
|
112
|
106 (void) ngx_sprintf(p0, "%s, %02d %s %4d %02d:%02d:%02d GMT",
|
|
107 week[gmt.ngx_tm_wday], gmt.ngx_tm_mday,
|
|
108 months[gmt.ngx_tm_mon - 1], gmt.ngx_tm_year,
|
|
109 gmt.ngx_tm_hour, gmt.ngx_tm_min, gmt.ngx_tm_sec);
|
0
|
110
|
18
|
111 #if (NGX_HAVE_GETTIMEZONE)
|
0
|
112
|
112
|
113 tp->gmtoff = ngx_gettimezone();
|
|
114 ngx_gmtime(sec + tp->gmtoff * 60, &tm);
|
0
|
115
|
18
|
116 #elif (NGX_HAVE_GMTOFF)
|
0
|
117
|
112
|
118 ngx_localtime(sec, &tm);
|
|
119 tp->gmtoff = (ngx_int_t) (tm.ngx_tm_gmtoff / 60);
|
0
|
120
|
|
121 #else
|
|
122
|
112
|
123 ngx_localtime(sec, &tm);
|
|
124 tp->gmtoff = ngx_timezone(tm.ngx_tm_isdst);
|
0
|
125
|
|
126 #endif
|
|
127
|
|
128
|
280
|
129 p1 = &cached_err_log_time[slot][0];
|
0
|
130
|
112
|
131 (void) ngx_sprintf(p1, "%4d/%02d/%02d %02d:%02d:%02d",
|
66
|
132 tm.ngx_tm_year, tm.ngx_tm_mon,
|
|
133 tm.ngx_tm_mday, tm.ngx_tm_hour,
|
|
134 tm.ngx_tm_min, tm.ngx_tm_sec);
|
0
|
135
|
|
136
|
280
|
137 p2 = &cached_http_log_time[slot][0];
|
0
|
138
|
112
|
139 (void) ngx_sprintf(p2, "%02d/%s/%d:%02d:%02d:%02d %c%02d%02d",
|
66
|
140 tm.ngx_tm_mday, months[tm.ngx_tm_mon - 1],
|
|
141 tm.ngx_tm_year, tm.ngx_tm_hour,
|
|
142 tm.ngx_tm_min, tm.ngx_tm_sec,
|
112
|
143 tp->gmtoff < 0 ? '-' : '+',
|
|
144 ngx_abs(tp->gmtoff / 60), ngx_abs(tp->gmtoff % 60));
|
0
|
145
|
|
146
|
112
|
147 ngx_memory_barrier();
|
0
|
148
|
112
|
149 ngx_cached_time = tp;
|
|
150 ngx_cached_http_time.data = p0;
|
|
151 ngx_cached_err_log_time.data = p1;
|
|
152 ngx_cached_http_log_time.data = p2;
|
|
153
|
|
154 ngx_unlock(&ngx_time_lock);
|
0
|
155 }
|
|
156
|
|
157
|
50
|
158 u_char *
|
|
159 ngx_http_time(u_char *buf, time_t t)
|
0
|
160 {
|
|
161 ngx_tm_t tm;
|
|
162
|
|
163 ngx_gmtime(t, &tm);
|
|
164
|
4
|
165 return ngx_sprintf(buf, "%s, %02d %s %4d %02d:%02d:%02d GMT",
|
|
166 week[tm.ngx_tm_wday],
|
|
167 tm.ngx_tm_mday,
|
|
168 months[tm.ngx_tm_mon - 1],
|
|
169 tm.ngx_tm_year,
|
|
170 tm.ngx_tm_hour,
|
|
171 tm.ngx_tm_min,
|
|
172 tm.ngx_tm_sec);
|
0
|
173 }
|
|
174
|
|
175
|
50
|
176 u_char *
|
|
177 ngx_http_cookie_time(u_char *buf, time_t t)
|
0
|
178 {
|
|
179 ngx_tm_t tm;
|
|
180
|
|
181 ngx_gmtime(t, &tm);
|
|
182
|
|
183 /*
|
|
184 * Netscape 3.x does not understand 4-digit years at all and
|
|
185 * 2-digit years more than "37"
|
|
186 */
|
|
187
|
4
|
188 return ngx_sprintf(buf,
|
|
189 (tm.ngx_tm_year > 2037) ?
|
|
190 "%s, %02d-%s-%d %02d:%02d:%02d GMT":
|
|
191 "%s, %02d-%s-%02d %02d:%02d:%02d GMT",
|
|
192 week[tm.ngx_tm_wday],
|
|
193 tm.ngx_tm_mday,
|
|
194 months[tm.ngx_tm_mon - 1],
|
|
195 (tm.ngx_tm_year > 2037) ? tm.ngx_tm_year:
|
|
196 tm.ngx_tm_year % 100,
|
|
197 tm.ngx_tm_hour,
|
|
198 tm.ngx_tm_min,
|
|
199 tm.ngx_tm_sec);
|
0
|
200 }
|
|
201
|
|
202
|
50
|
203 void
|
|
204 ngx_gmtime(time_t t, ngx_tm_t *tp)
|
0
|
205 {
|
372
|
206 ngx_int_t yday;
|
|
207 ngx_uint_t n, sec, min, hour, mday, mon, year, wday, days, leap;
|
0
|
208
|
364
|
209 /* the calculation is valid for positive time_t only */
|
372
|
210
|
364
|
211 n = (ngx_uint_t) t;
|
|
212
|
|
213 days = n / 86400;
|
0
|
214
|
|
215 /* Jaunary 1, 1970 was Thursday */
|
372
|
216
|
0
|
217 wday = (4 + days) % 7;
|
|
218
|
364
|
219 n %= 86400;
|
|
220 hour = n / 3600;
|
|
221 n %= 3600;
|
|
222 min = n / 60;
|
|
223 sec = n % 60;
|
0
|
224
|
372
|
225 /*
|
|
226 * the algorithm based on Gauss' formula,
|
|
227 * see src/http/ngx_http_parse_time.c
|
|
228 */
|
0
|
229
|
372
|
230 /* days since March 1, 1 BC */
|
0
|
231 days = days - (31 + 28) + 719527;
|
|
232
|
372
|
233 /*
|
|
234 * The "days" should be adjusted to 1 only, however, some March 1st's go
|
|
235 * to previous year, so we adjust them to 2. This causes also shift of the
|
|
236 * last Feburary days to next year, but we catch the case when "yday"
|
|
237 * becomes negative.
|
|
238 */
|
|
239
|
|
240 year = (days + 2) * 400 / (365 * 400 + 100 - 4 + 1);
|
|
241
|
0
|
242 yday = days - (365 * year + year / 4 - year / 100 + year / 400);
|
|
243
|
372
|
244 if (yday < 0) {
|
|
245 leap = (year % 4 == 0) && (year % 100 || (year % 400 == 0));
|
|
246 yday = 365 + leap + yday;
|
|
247 year--;
|
|
248 }
|
0
|
249
|
372
|
250 /*
|
|
251 * The empirical formula that maps "yday" to month.
|
|
252 * There are at least 10 variants, some of them are:
|
|
253 * mon = (yday + 31) * 15 / 459
|
|
254 * mon = (yday + 31) * 17 / 520
|
|
255 * mon = (yday + 31) * 20 / 612
|
|
256 */
|
|
257
|
|
258 mon = (yday + 31) * 10 / 306;
|
|
259
|
|
260 /* the Gauss' formula that evaluates days before the month */
|
|
261
|
|
262 mday = yday - (367 * mon / 12 - 30) + 1;
|
0
|
263
|
|
264 if (yday >= 306) {
|
|
265
|
372
|
266 year++;
|
|
267 mon -= 10;
|
|
268
|
0
|
269 /*
|
|
270 * there is no "yday" in Win32 SYSTEMTIME
|
|
271 *
|
|
272 * yday -= 306;
|
|
273 */
|
|
274
|
372
|
275 } else {
|
0
|
276
|
372
|
277 mon += 2;
|
0
|
278
|
372
|
279 /*
|
|
280 * there is no "yday" in Win32 SYSTEMTIME
|
|
281 *
|
|
282 * yday += 31 + 28 + leap;
|
|
283 */
|
0
|
284 }
|
|
285
|
|
286 tp->ngx_tm_sec = (ngx_tm_sec_t) sec;
|
|
287 tp->ngx_tm_min = (ngx_tm_min_t) min;
|
|
288 tp->ngx_tm_hour = (ngx_tm_hour_t) hour;
|
|
289 tp->ngx_tm_mday = (ngx_tm_mday_t) mday;
|
|
290 tp->ngx_tm_mon = (ngx_tm_mon_t) mon;
|
|
291 tp->ngx_tm_year = (ngx_tm_year_t) year;
|
|
292 tp->ngx_tm_wday = (ngx_tm_wday_t) wday;
|
|
293 }
|