Initial commit
This commit is contained in:
Hakase
@@ -0,0 +1,440 @@
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/*
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* Copyright (C) Igor Sysoev
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* Copyright (C) Nginx, Inc.
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*/
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#include <ngx_config.h>
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#include <ngx_core.h>
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/*
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* The time may be updated by signal handler or by several threads.
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* The time update operations are rare and require to hold the ngx_time_lock.
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* The time read operations are frequent, so they are lock-free and get time
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* values and strings from the current slot. Thus thread may get the corrupted
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* values only if it is preempted while copying and then it is not scheduled
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* to run more than NGX_TIME_SLOTS seconds.
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*/
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#define NGX_TIME_SLOTS 64
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static ngx_uint_t slot;
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static ngx_atomic_t ngx_time_lock;
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volatile ngx_msec_t ngx_current_msec;
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volatile ngx_time_t *ngx_cached_time;
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volatile ngx_str_t ngx_cached_err_log_time;
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volatile ngx_str_t ngx_cached_http_time;
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volatile ngx_str_t ngx_cached_http_log_time;
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volatile ngx_str_t ngx_cached_http_log_iso8601;
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volatile ngx_str_t ngx_cached_syslog_time;
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#if !(NGX_WIN32)
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/*
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* localtime() and localtime_r() are not Async-Signal-Safe functions, therefore,
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* they must not be called by a signal handler, so we use the cached
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* GMT offset value. Fortunately the value is changed only two times a year.
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*/
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static ngx_int_t cached_gmtoff;
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#endif
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static ngx_time_t cached_time[NGX_TIME_SLOTS];
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static u_char cached_err_log_time[NGX_TIME_SLOTS]
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[sizeof("1970/09/28 12:00:00")];
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static u_char cached_http_time[NGX_TIME_SLOTS]
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[sizeof("Mon, 28 Sep 1970 06:00:00 GMT")];
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static u_char cached_http_log_time[NGX_TIME_SLOTS]
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[sizeof("28/Sep/1970:12:00:00 +0600")];
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static u_char cached_http_log_iso8601[NGX_TIME_SLOTS]
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[sizeof("1970-09-28T12:00:00+06:00")];
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static u_char cached_syslog_time[NGX_TIME_SLOTS]
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[sizeof("Sep 28 12:00:00")];
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static char *week[] = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };
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static char *months[] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
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"Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
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void
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ngx_time_init(void)
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{
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ngx_cached_err_log_time.len = sizeof("1970/09/28 12:00:00") - 1;
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ngx_cached_http_time.len = sizeof("Mon, 28 Sep 1970 06:00:00 GMT") - 1;
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ngx_cached_http_log_time.len = sizeof("28/Sep/1970:12:00:00 +0600") - 1;
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ngx_cached_http_log_iso8601.len = sizeof("1970-09-28T12:00:00+06:00") - 1;
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ngx_cached_syslog_time.len = sizeof("Sep 28 12:00:00") - 1;
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ngx_cached_time = &cached_time[0];
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ngx_time_update();
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}
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void
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ngx_time_update(void)
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{
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u_char *p0, *p1, *p2, *p3, *p4;
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ngx_tm_t tm, gmt;
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time_t sec;
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ngx_uint_t msec;
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ngx_time_t *tp;
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struct timeval tv;
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if (!ngx_trylock(&ngx_time_lock)) {
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return;
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}
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ngx_gettimeofday(&tv);
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sec = tv.tv_sec;
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msec = tv.tv_usec / 1000;
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ngx_current_msec = (ngx_msec_t) sec * 1000 + msec;
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tp = &cached_time[slot];
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if (tp->sec == sec) {
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tp->msec = msec;
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ngx_unlock(&ngx_time_lock);
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return;
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}
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if (slot == NGX_TIME_SLOTS - 1) {
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slot = 0;
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} else {
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slot++;
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}
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tp = &cached_time[slot];
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tp->sec = sec;
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tp->msec = msec;
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ngx_gmtime(sec, &gmt);
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p0 = &cached_http_time[slot][0];
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(void) ngx_sprintf(p0, "%s, %02d %s %4d %02d:%02d:%02d GMT",
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week[gmt.ngx_tm_wday], gmt.ngx_tm_mday,
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months[gmt.ngx_tm_mon - 1], gmt.ngx_tm_year,
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gmt.ngx_tm_hour, gmt.ngx_tm_min, gmt.ngx_tm_sec);
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#if (NGX_HAVE_GETTIMEZONE)
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tp->gmtoff = ngx_gettimezone();
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ngx_gmtime(sec + tp->gmtoff * 60, &tm);
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#elif (NGX_HAVE_GMTOFF)
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ngx_localtime(sec, &tm);
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cached_gmtoff = (ngx_int_t) (tm.ngx_tm_gmtoff / 60);
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tp->gmtoff = cached_gmtoff;
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#else
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ngx_localtime(sec, &tm);
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cached_gmtoff = ngx_timezone(tm.ngx_tm_isdst);
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tp->gmtoff = cached_gmtoff;
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#endif
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p1 = &cached_err_log_time[slot][0];
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(void) ngx_sprintf(p1, "%4d/%02d/%02d %02d:%02d:%02d",
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tm.ngx_tm_year, tm.ngx_tm_mon,
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tm.ngx_tm_mday, tm.ngx_tm_hour,
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tm.ngx_tm_min, tm.ngx_tm_sec);
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p2 = &cached_http_log_time[slot][0];
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(void) ngx_sprintf(p2, "%02d/%s/%d:%02d:%02d:%02d %c%02i%02i",
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tm.ngx_tm_mday, months[tm.ngx_tm_mon - 1],
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tm.ngx_tm_year, tm.ngx_tm_hour,
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tm.ngx_tm_min, tm.ngx_tm_sec,
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tp->gmtoff < 0 ? '-' : '+',
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ngx_abs(tp->gmtoff / 60), ngx_abs(tp->gmtoff % 60));
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p3 = &cached_http_log_iso8601[slot][0];
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(void) ngx_sprintf(p3, "%4d-%02d-%02dT%02d:%02d:%02d%c%02i:%02i",
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tm.ngx_tm_year, tm.ngx_tm_mon,
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tm.ngx_tm_mday, tm.ngx_tm_hour,
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tm.ngx_tm_min, tm.ngx_tm_sec,
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tp->gmtoff < 0 ? '-' : '+',
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ngx_abs(tp->gmtoff / 60), ngx_abs(tp->gmtoff % 60));
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p4 = &cached_syslog_time[slot][0];
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(void) ngx_sprintf(p4, "%s %2d %02d:%02d:%02d",
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months[tm.ngx_tm_mon - 1], tm.ngx_tm_mday,
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tm.ngx_tm_hour, tm.ngx_tm_min, tm.ngx_tm_sec);
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ngx_memory_barrier();
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ngx_cached_time = tp;
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ngx_cached_http_time.data = p0;
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ngx_cached_err_log_time.data = p1;
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ngx_cached_http_log_time.data = p2;
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ngx_cached_http_log_iso8601.data = p3;
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ngx_cached_syslog_time.data = p4;
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ngx_unlock(&ngx_time_lock);
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}
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#if !(NGX_WIN32)
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void
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ngx_time_sigsafe_update(void)
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{
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u_char *p, *p2;
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ngx_tm_t tm;
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time_t sec;
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ngx_time_t *tp;
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struct timeval tv;
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if (!ngx_trylock(&ngx_time_lock)) {
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return;
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}
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ngx_gettimeofday(&tv);
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sec = tv.tv_sec;
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tp = &cached_time[slot];
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if (tp->sec == sec) {
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ngx_unlock(&ngx_time_lock);
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return;
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}
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if (slot == NGX_TIME_SLOTS - 1) {
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slot = 0;
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} else {
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slot++;
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}
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tp = &cached_time[slot];
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tp->sec = 0;
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ngx_gmtime(sec + cached_gmtoff * 60, &tm);
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p = &cached_err_log_time[slot][0];
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(void) ngx_sprintf(p, "%4d/%02d/%02d %02d:%02d:%02d",
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tm.ngx_tm_year, tm.ngx_tm_mon,
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tm.ngx_tm_mday, tm.ngx_tm_hour,
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tm.ngx_tm_min, tm.ngx_tm_sec);
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p2 = &cached_syslog_time[slot][0];
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(void) ngx_sprintf(p2, "%s %2d %02d:%02d:%02d",
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months[tm.ngx_tm_mon - 1], tm.ngx_tm_mday,
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tm.ngx_tm_hour, tm.ngx_tm_min, tm.ngx_tm_sec);
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ngx_memory_barrier();
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ngx_cached_err_log_time.data = p;
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ngx_cached_syslog_time.data = p2;
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ngx_unlock(&ngx_time_lock);
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}
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#endif
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u_char *
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ngx_http_time(u_char *buf, time_t t)
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{
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ngx_tm_t tm;
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ngx_gmtime(t, &tm);
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return ngx_sprintf(buf, "%s, %02d %s %4d %02d:%02d:%02d GMT",
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week[tm.ngx_tm_wday],
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tm.ngx_tm_mday,
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months[tm.ngx_tm_mon - 1],
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tm.ngx_tm_year,
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tm.ngx_tm_hour,
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tm.ngx_tm_min,
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tm.ngx_tm_sec);
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}
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u_char *
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ngx_http_cookie_time(u_char *buf, time_t t)
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{
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ngx_tm_t tm;
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ngx_gmtime(t, &tm);
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/*
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* Netscape 3.x does not understand 4-digit years at all and
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* 2-digit years more than "37"
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*/
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return ngx_sprintf(buf,
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(tm.ngx_tm_year > 2037) ?
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"%s, %02d-%s-%d %02d:%02d:%02d GMT":
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"%s, %02d-%s-%02d %02d:%02d:%02d GMT",
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week[tm.ngx_tm_wday],
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tm.ngx_tm_mday,
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months[tm.ngx_tm_mon - 1],
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(tm.ngx_tm_year > 2037) ? tm.ngx_tm_year:
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tm.ngx_tm_year % 100,
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tm.ngx_tm_hour,
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tm.ngx_tm_min,
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tm.ngx_tm_sec);
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}
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void
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ngx_gmtime(time_t t, ngx_tm_t *tp)
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{
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ngx_int_t yday;
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ngx_uint_t sec, min, hour, mday, mon, year, wday, days, leap;
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/* the calculation is valid for positive time_t only */
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if (t < 0) {
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t = 0;
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}
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days = t / 86400;
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sec = t % 86400;
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/*
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* no more than 4 year digits supported,
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* truncate to December 31, 9999, 23:59:59
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*/
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if (days > 2932896) {
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days = 2932896;
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sec = 86399;
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}
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/* January 1, 1970 was Thursday */
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wday = (4 + days) % 7;
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hour = sec / 3600;
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sec %= 3600;
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min = sec / 60;
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sec %= 60;
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/*
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* the algorithm based on Gauss' formula,
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* see src/core/ngx_parse_time.c
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*/
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/* days since March 1, 1 BC */
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days = days - (31 + 28) + 719527;
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/*
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* The "days" should be adjusted to 1 only, however, some March 1st's go
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* to previous year, so we adjust them to 2. This causes also shift of the
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* last February days to next year, but we catch the case when "yday"
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* becomes negative.
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*/
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year = (days + 2) * 400 / (365 * 400 + 100 - 4 + 1);
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yday = days - (365 * year + year / 4 - year / 100 + year / 400);
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if (yday < 0) {
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leap = (year % 4 == 0) && (year % 100 || (year % 400 == 0));
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yday = 365 + leap + yday;
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year--;
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}
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/*
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* The empirical formula that maps "yday" to month.
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* There are at least 10 variants, some of them are:
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* mon = (yday + 31) * 15 / 459
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* mon = (yday + 31) * 17 / 520
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* mon = (yday + 31) * 20 / 612
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*/
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mon = (yday + 31) * 10 / 306;
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/* the Gauss' formula that evaluates days before the month */
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mday = yday - (367 * mon / 12 - 30) + 1;
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if (yday >= 306) {
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year++;
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mon -= 10;
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/*
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* there is no "yday" in Win32 SYSTEMTIME
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*
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* yday -= 306;
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*/
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} else {
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mon += 2;
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/*
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* there is no "yday" in Win32 SYSTEMTIME
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*
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* yday += 31 + 28 + leap;
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*/
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}
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tp->ngx_tm_sec = (ngx_tm_sec_t) sec;
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tp->ngx_tm_min = (ngx_tm_min_t) min;
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tp->ngx_tm_hour = (ngx_tm_hour_t) hour;
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tp->ngx_tm_mday = (ngx_tm_mday_t) mday;
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tp->ngx_tm_mon = (ngx_tm_mon_t) mon;
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tp->ngx_tm_year = (ngx_tm_year_t) year;
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tp->ngx_tm_wday = (ngx_tm_wday_t) wday;
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}
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time_t
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ngx_next_time(time_t when)
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{
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time_t now, next;
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struct tm tm;
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now = ngx_time();
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ngx_libc_localtime(now, &tm);
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tm.tm_hour = (int) (when / 3600);
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when %= 3600;
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tm.tm_min = (int) (when / 60);
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tm.tm_sec = (int) (when % 60);
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next = mktime(&tm);
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if (next == -1) {
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return -1;
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}
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if (next - now > 0) {
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return next;
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}
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tm.tm_mday++;
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/* mktime() should normalize a date (Jan 32, etc) */
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next = mktime(&tm);
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if (next != -1) {
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return next;
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}
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return -1;
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}
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