| |
| /* |
| * Copyright (C) Igor Sysoev |
| */ |
| |
| |
| #include <ngx_config.h> |
| #include <ngx_core.h> |
| |
| |
| /* |
| * The time may be updated by signal handler or by several threads. |
| * The time update operations are rare and require to hold the ngx_time_lock. |
| * The time read operations are frequent, so they are lock-free and get time |
| * values and strings from the current slot. Thus thread may get the corrupted |
| * values only if it is preempted while copying and then it is not scheduled |
| * to run more than NGX_TIME_SLOTS seconds. |
| */ |
| |
| #define NGX_TIME_SLOTS 64 |
| |
| static ngx_uint_t slot; |
| static ngx_atomic_t ngx_time_lock; |
| |
| volatile ngx_msec_t ngx_current_msec; |
| volatile ngx_time_t *ngx_cached_time; |
| volatile ngx_str_t ngx_cached_err_log_time; |
| volatile ngx_str_t ngx_cached_http_time; |
| volatile ngx_str_t ngx_cached_http_log_time; |
| |
| #if !(NGX_WIN32) |
| |
| /* |
| * locatime() and localtime_r() are not Async-Signal-Safe functions, therefore, |
| * they must not be called by a signal handler, so we use the cached |
| * GMT offset value. Fortunately the value is changed only two times a year. |
| */ |
| |
| static ngx_int_t cached_gmtoff; |
| #endif |
| |
| static ngx_time_t cached_time[NGX_TIME_SLOTS]; |
| static u_char cached_err_log_time[NGX_TIME_SLOTS] |
| [sizeof("1970/09/28 12:00:00")]; |
| static u_char cached_http_time[NGX_TIME_SLOTS] |
| [sizeof("Mon, 28 Sep 1970 06:00:00 GMT")]; |
| static u_char cached_http_log_time[NGX_TIME_SLOTS] |
| [sizeof("28/Sep/1970:12:00:00 +0600")]; |
| |
| |
| static char *week[] = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" }; |
| static char *months[] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun", |
| "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" }; |
| |
| void |
| ngx_time_init(void) |
| { |
| ngx_cached_err_log_time.len = sizeof("1970/09/28 12:00:00") - 1; |
| ngx_cached_http_time.len = sizeof("Mon, 28 Sep 1970 06:00:00 GMT") - 1; |
| ngx_cached_http_log_time.len = sizeof("28/Sep/1970:12:00:00 +0600") - 1; |
| |
| ngx_cached_time = &cached_time[0]; |
| |
| ngx_time_update(); |
| } |
| |
| |
| void |
| ngx_time_update(void) |
| { |
| u_char *p0, *p1, *p2; |
| ngx_tm_t tm, gmt; |
| time_t sec; |
| ngx_uint_t msec; |
| ngx_time_t *tp; |
| struct timeval tv; |
| |
| if (!ngx_trylock(&ngx_time_lock)) { |
| return; |
| } |
| |
| ngx_gettimeofday(&tv); |
| |
| sec = tv.tv_sec; |
| msec = tv.tv_usec / 1000; |
| |
| ngx_current_msec = (ngx_msec_t) sec * 1000 + msec; |
| |
| tp = &cached_time[slot]; |
| |
| if (tp->sec == sec) { |
| tp->msec = msec; |
| ngx_unlock(&ngx_time_lock); |
| return; |
| } |
| |
| if (slot == NGX_TIME_SLOTS - 1) { |
| slot = 0; |
| } else { |
| slot++; |
| } |
| |
| tp = &cached_time[slot]; |
| |
| tp->sec = sec; |
| tp->msec = msec; |
| |
| ngx_gmtime(sec, &gmt); |
| |
| |
| p0 = &cached_http_time[slot][0]; |
| |
| (void) ngx_sprintf(p0, "%s, %02d %s %4d %02d:%02d:%02d GMT", |
| week[gmt.ngx_tm_wday], gmt.ngx_tm_mday, |
| months[gmt.ngx_tm_mon - 1], gmt.ngx_tm_year, |
| gmt.ngx_tm_hour, gmt.ngx_tm_min, gmt.ngx_tm_sec); |
| |
| #if (NGX_HAVE_GETTIMEZONE) |
| |
| tp->gmtoff = ngx_gettimezone(); |
| ngx_gmtime(sec + tp->gmtoff * 60, &tm); |
| |
| #elif (NGX_HAVE_GMTOFF) |
| |
| ngx_localtime(sec, &tm); |
| cached_gmtoff = (ngx_int_t) (tm.ngx_tm_gmtoff / 60); |
| tp->gmtoff = cached_gmtoff; |
| |
| #else |
| |
| ngx_localtime(sec, &tm); |
| cached_gmtoff = ngx_timezone(tm.ngx_tm_isdst); |
| tp->gmtoff = cached_gmtoff; |
| |
| #endif |
| |
| |
| p1 = &cached_err_log_time[slot][0]; |
| |
| (void) ngx_sprintf(p1, "%4d/%02d/%02d %02d:%02d:%02d", |
| tm.ngx_tm_year, tm.ngx_tm_mon, |
| tm.ngx_tm_mday, tm.ngx_tm_hour, |
| tm.ngx_tm_min, tm.ngx_tm_sec); |
| |
| |
| p2 = &cached_http_log_time[slot][0]; |
| |
| (void) ngx_sprintf(p2, "%02d/%s/%d:%02d:%02d:%02d %c%02d%02d", |
| tm.ngx_tm_mday, months[tm.ngx_tm_mon - 1], |
| tm.ngx_tm_year, tm.ngx_tm_hour, |
| tm.ngx_tm_min, tm.ngx_tm_sec, |
| tp->gmtoff < 0 ? '-' : '+', |
| ngx_abs(tp->gmtoff / 60), ngx_abs(tp->gmtoff % 60)); |
| |
| |
| ngx_memory_barrier(); |
| |
| ngx_cached_time = tp; |
| ngx_cached_http_time.data = p0; |
| ngx_cached_err_log_time.data = p1; |
| ngx_cached_http_log_time.data = p2; |
| |
| ngx_unlock(&ngx_time_lock); |
| } |
| |
| |
| #if !(NGX_WIN32) |
| |
| void |
| ngx_time_sigsafe_update(void) |
| { |
| u_char *p; |
| ngx_tm_t tm; |
| time_t sec; |
| ngx_time_t *tp; |
| struct timeval tv; |
| |
| if (!ngx_trylock(&ngx_time_lock)) { |
| return; |
| } |
| |
| ngx_gettimeofday(&tv); |
| |
| sec = tv.tv_sec; |
| |
| tp = &cached_time[slot]; |
| |
| if (tp->sec == sec) { |
| ngx_unlock(&ngx_time_lock); |
| return; |
| } |
| |
| if (slot == NGX_TIME_SLOTS - 1) { |
| slot = 0; |
| } else { |
| slot++; |
| } |
| |
| ngx_gmtime(sec + cached_gmtoff * 60, &tm); |
| |
| p = &cached_err_log_time[slot][0]; |
| |
| (void) ngx_sprintf(p, "%4d/%02d/%02d %02d:%02d:%02d", |
| tm.ngx_tm_year, tm.ngx_tm_mon, |
| tm.ngx_tm_mday, tm.ngx_tm_hour, |
| tm.ngx_tm_min, tm.ngx_tm_sec); |
| |
| ngx_memory_barrier(); |
| |
| ngx_cached_err_log_time.data = p; |
| |
| ngx_unlock(&ngx_time_lock); |
| } |
| |
| #endif |
| |
| |
| u_char * |
| ngx_http_time(u_char *buf, time_t t) |
| { |
| ngx_tm_t tm; |
| |
| ngx_gmtime(t, &tm); |
| |
| return ngx_sprintf(buf, "%s, %02d %s %4d %02d:%02d:%02d GMT", |
| week[tm.ngx_tm_wday], |
| tm.ngx_tm_mday, |
| months[tm.ngx_tm_mon - 1], |
| tm.ngx_tm_year, |
| tm.ngx_tm_hour, |
| tm.ngx_tm_min, |
| tm.ngx_tm_sec); |
| } |
| |
| |
| u_char * |
| ngx_http_cookie_time(u_char *buf, time_t t) |
| { |
| ngx_tm_t tm; |
| |
| ngx_gmtime(t, &tm); |
| |
| /* |
| * Netscape 3.x does not understand 4-digit years at all and |
| * 2-digit years more than "37" |
| */ |
| |
| return ngx_sprintf(buf, |
| (tm.ngx_tm_year > 2037) ? |
| "%s, %02d-%s-%d %02d:%02d:%02d GMT": |
| "%s, %02d-%s-%02d %02d:%02d:%02d GMT", |
| week[tm.ngx_tm_wday], |
| tm.ngx_tm_mday, |
| months[tm.ngx_tm_mon - 1], |
| (tm.ngx_tm_year > 2037) ? tm.ngx_tm_year: |
| tm.ngx_tm_year % 100, |
| tm.ngx_tm_hour, |
| tm.ngx_tm_min, |
| tm.ngx_tm_sec); |
| } |
| |
| |
| void |
| ngx_gmtime(time_t t, ngx_tm_t *tp) |
| { |
| ngx_int_t yday; |
| ngx_uint_t n, sec, min, hour, mday, mon, year, wday, days, leap; |
| |
| /* the calculation is valid for positive time_t only */ |
| |
| n = (ngx_uint_t) t; |
| |
| days = n / 86400; |
| |
| /* Jaunary 1, 1970 was Thursday */ |
| |
| wday = (4 + days) % 7; |
| |
| n %= 86400; |
| hour = n / 3600; |
| n %= 3600; |
| min = n / 60; |
| sec = n % 60; |
| |
| /* |
| * the algorithm based on Gauss' formula, |
| * see src/http/ngx_http_parse_time.c |
| */ |
| |
| /* days since March 1, 1 BC */ |
| days = days - (31 + 28) + 719527; |
| |
| /* |
| * The "days" should be adjusted to 1 only, however, some March 1st's go |
| * to previous year, so we adjust them to 2. This causes also shift of the |
| * last Feburary days to next year, but we catch the case when "yday" |
| * becomes negative. |
| */ |
| |
| year = (days + 2) * 400 / (365 * 400 + 100 - 4 + 1); |
| |
| yday = days - (365 * year + year / 4 - year / 100 + year / 400); |
| |
| if (yday < 0) { |
| leap = (year % 4 == 0) && (year % 100 || (year % 400 == 0)); |
| yday = 365 + leap + yday; |
| year--; |
| } |
| |
| /* |
| * The empirical formula that maps "yday" to month. |
| * There are at least 10 variants, some of them are: |
| * mon = (yday + 31) * 15 / 459 |
| * mon = (yday + 31) * 17 / 520 |
| * mon = (yday + 31) * 20 / 612 |
| */ |
| |
| mon = (yday + 31) * 10 / 306; |
| |
| /* the Gauss' formula that evaluates days before the month */ |
| |
| mday = yday - (367 * mon / 12 - 30) + 1; |
| |
| if (yday >= 306) { |
| |
| year++; |
| mon -= 10; |
| |
| /* |
| * there is no "yday" in Win32 SYSTEMTIME |
| * |
| * yday -= 306; |
| */ |
| |
| } else { |
| |
| mon += 2; |
| |
| /* |
| * there is no "yday" in Win32 SYSTEMTIME |
| * |
| * yday += 31 + 28 + leap; |
| */ |
| } |
| |
| tp->ngx_tm_sec = (ngx_tm_sec_t) sec; |
| tp->ngx_tm_min = (ngx_tm_min_t) min; |
| tp->ngx_tm_hour = (ngx_tm_hour_t) hour; |
| tp->ngx_tm_mday = (ngx_tm_mday_t) mday; |
| tp->ngx_tm_mon = (ngx_tm_mon_t) mon; |
| tp->ngx_tm_year = (ngx_tm_year_t) year; |
| tp->ngx_tm_wday = (ngx_tm_wday_t) wday; |
| } |
| |
| |
| time_t |
| ngx_next_time(time_t when) |
| { |
| time_t now, next; |
| struct tm tm; |
| |
| now = ngx_time(); |
| |
| ngx_libc_localtime(now, &tm); |
| |
| tm.tm_hour = (int) (when / 3600); |
| when %= 3600; |
| tm.tm_min = (int) (when / 60); |
| tm.tm_sec = (int) (when % 60); |
| |
| next = mktime(&tm); |
| |
| if (next == -1) { |
| return -1; |
| } |
| |
| if (next - now > 0) { |
| return next; |
| } |
| |
| tm.tm_mday++; |
| |
| /* mktime() should normalize a date (Jan 32, etc) */ |
| |
| next = mktime(&tm); |
| |
| if (next != -1) { |
| return next; |
| } |
| |
| return -1; |
| } |