diff options
Diffstat (limited to 'app/nginx/src/core/ngx_times.c')
| -rw-r--r-- | app/nginx/src/core/ngx_times.c | 428 |
1 files changed, 428 insertions, 0 deletions
diff --git a/app/nginx/src/core/ngx_times.c b/app/nginx/src/core/ngx_times.c new file mode 100644 index 0000000..843314a --- /dev/null +++ b/app/nginx/src/core/ngx_times.c @@ -0,0 +1,428 @@ + +/* + * Copyright (C) Igor Sysoev + * Copyright (C) Nginx, Inc. + */ + + +#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; +volatile ngx_str_t ngx_cached_http_log_iso8601; +volatile ngx_str_t ngx_cached_syslog_time; + +#if !(NGX_WIN32) + +/* + * localtime() 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 u_char cached_http_log_iso8601[NGX_TIME_SLOTS] + [sizeof("1970-09-28T12:00:00+06:00")]; +static u_char cached_syslog_time[NGX_TIME_SLOTS] + [sizeof("Sep 28 12:00:00")]; + + +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_http_log_iso8601.len = sizeof("1970-09-28T12:00:00+06:00") - 1; + ngx_cached_syslog_time.len = sizeof("Sep 28 12:00:00") - 1; + + ngx_cached_time = &cached_time[0]; + + ngx_time_update(); +} + + +void +ngx_time_update(void) +{ + u_char *p0, *p1, *p2, *p3, *p4; + 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%02i%02i", + 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)); + + p3 = &cached_http_log_iso8601[slot][0]; + + (void) ngx_sprintf(p3, "%4d-%02d-%02dT%02d:%02d:%02d%c%02i:%02i", + tm.ngx_tm_year, tm.ngx_tm_mon, + tm.ngx_tm_mday, 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)); + + p4 = &cached_syslog_time[slot][0]; + + (void) ngx_sprintf(p4, "%s %2d %02d:%02d:%02d", + months[tm.ngx_tm_mon - 1], tm.ngx_tm_mday, + tm.ngx_tm_hour, tm.ngx_tm_min, tm.ngx_tm_sec); + + 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_cached_http_log_iso8601.data = p3; + ngx_cached_syslog_time.data = p4; + + ngx_unlock(&ngx_time_lock); +} + + +#if !(NGX_WIN32) + +void +ngx_time_sigsafe_update(void) +{ + u_char *p, *p2; + 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++; + } + + tp = &cached_time[slot]; + + tp->sec = 0; + + 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); + + p2 = &cached_syslog_time[slot][0]; + + (void) ngx_sprintf(p2, "%s %2d %02d:%02d:%02d", + months[tm.ngx_tm_mon - 1], 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_cached_syslog_time.data = p2; + + 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; + + /* January 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 February 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; +} |