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/*
* 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 = NGX_TIME_SLOTS;
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;
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];
#if !(NGX_WIN32)
tzset();
#endif
ngx_time_update(0, 0);
}
void
ngx_time_update(time_t sec, ngx_uint_t msec)
{
u_char *p0, *p1, *p2;
ngx_tm_t tm, gmt;
ngx_time_t *tp;
struct timeval tv;
if (!ngx_trylock(&ngx_time_lock)) {
return;
}
if (slot == NGX_TIME_SLOTS) {
slot = 0;
} else {
slot++;
}
if (sec == 0) {
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];
tp->msec = msec;
if (tp->sec == sec) {
ngx_unlock(&ngx_time_lock);
return;
}
tp->sec = sec;
ngx_gmtime(sec, &gmt);
p0 = cached_http_time[slot];
(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);
tp->gmtoff = (ngx_int_t) (tm.ngx_tm_gmtoff / 60);
#else
ngx_localtime(sec, &tm);
tp->gmtoff = ngx_timezone(tm.ngx_tm_isdst);
#endif
p1 = cached_err_log_time[slot];
(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];
(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);
}
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 sec, min, hour, mday, mon, year, wday, yday, days;
days = t / 86400;
/* Jaunary 1, 1970 was Thursday */
wday = (4 + days) % 7;
t %= 86400;
hour = t / 3600;
t %= 3600;
min = t / 60;
sec = t % 60;
/* the algorithm based on Gauss's formula */
days = days - (31 + 28) + 719527;
year = days * 400 / (365 * 400 + 100 - 4 + 1);
yday = days - (365 * year + year / 4 - year / 100 + year / 400);
mon = (yday + 31) * 12 / 367;
mday = yday - (mon * 367 / 12 - 31);
mon += 2;
if (yday >= 306) {
/*
* there is no "yday" in Win32 SYSTEMTIME
*
* yday -= 306;
*/
year++;
mon -= 12;
if (mday == 0) {
/* Jaunary 31 */
mon = 1;
mday = 31;
} else if (mon == 2) {
if ((year % 4 == 0) && (year % 100 || (year % 400 == 0))) {
if (mday > 29) {
mon = 3;
mday -= 29;
}
} else if (mday > 28) {
mon = 3;
mday -= 28;
}
}
/*
* there is no "yday" in Win32 SYSTEMTIME
*
* } else {
* yday += 31 + 28;
*
* if ((year % 4 == 0) && (year % 100 || (year % 400 == 0))) {
* yday++;
* }
*/
}
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;
}
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