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0
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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660
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4 * Copyright (C) Nginx, Inc.
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0
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5 */
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6
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7
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8 #include <ngx_config.h>
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9 #include <ngx_core.h>
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10
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11
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12 /*
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112
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13 * The time may be updated by signal handler or by several threads.
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14 * The time update operations are rare and require to hold the ngx_time_lock.
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15 * The time read operations are frequent, so they are lock-free and get time
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16 * values and strings from the current slot. Thus thread may get the corrupted
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17 * values only if it is preempted while copying and then it is not scheduled
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18 * to run more than NGX_TIME_SLOTS seconds.
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0
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19 */
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20
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112
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21 #define NGX_TIME_SLOTS 64
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0
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22
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270
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23 static ngx_uint_t slot;
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112
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24 static ngx_atomic_t ngx_time_lock;
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0
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25
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112
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26 volatile ngx_msec_t ngx_current_msec;
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27 volatile ngx_time_t *ngx_cached_time;
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28 volatile ngx_str_t ngx_cached_err_log_time;
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29 volatile ngx_str_t ngx_cached_http_time;
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30 volatile ngx_str_t ngx_cached_http_log_time;
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616
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31 volatile ngx_str_t ngx_cached_http_log_iso8601;
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0
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32
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566
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33 #if !(NGX_WIN32)
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34
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35 /*
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36 * locatime() and localtime_r() are not Async-Signal-Safe functions, therefore,
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37 * they must not be called by a signal handler, so we use the cached
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38 * GMT offset value. Fortunately the value is changed only two times a year.
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39 */
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40
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41 static ngx_int_t cached_gmtoff;
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42 #endif
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43
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112
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44 static ngx_time_t cached_time[NGX_TIME_SLOTS];
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45 static u_char cached_err_log_time[NGX_TIME_SLOTS]
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46 [sizeof("1970/09/28 12:00:00")];
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47 static u_char cached_http_time[NGX_TIME_SLOTS]
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48 [sizeof("Mon, 28 Sep 1970 06:00:00 GMT")];
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49 static u_char cached_http_log_time[NGX_TIME_SLOTS]
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50 [sizeof("28/Sep/1970:12:00:00 +0600")];
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616
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51 static u_char cached_http_log_iso8601[NGX_TIME_SLOTS]
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52 [sizeof("1970-09-28T12:00:00+06:00")];
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0
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53
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54
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55 static char *week[] = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };
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56 static char *months[] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
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57 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
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58
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50
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59 void
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60 ngx_time_init(void)
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0
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61 {
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62 ngx_cached_err_log_time.len = sizeof("1970/09/28 12:00:00") - 1;
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63 ngx_cached_http_time.len = sizeof("Mon, 28 Sep 1970 06:00:00 GMT") - 1;
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64 ngx_cached_http_log_time.len = sizeof("28/Sep/1970:12:00:00 +0600") - 1;
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616
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65 ngx_cached_http_log_iso8601.len = sizeof("1970-09-28T12:00:00+06:00") - 1;
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0
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66
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67 ngx_cached_time = &cached_time[0];
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68
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566
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69 ngx_time_update();
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0
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70 }
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71
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72
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112
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73 void
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566
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74 ngx_time_update(void)
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0
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75 {
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616
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76 u_char *p0, *p1, *p2, *p3;
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112
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77 ngx_tm_t tm, gmt;
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566
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78 time_t sec;
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79 ngx_uint_t msec;
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112
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80 ngx_time_t *tp;
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81 struct timeval tv;
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0
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82
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112
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83 if (!ngx_trylock(&ngx_time_lock)) {
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84 return;
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85 }
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86
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566
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87 ngx_gettimeofday(&tv);
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112
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88
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566
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89 sec = tv.tv_sec;
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90 msec = tv.tv_usec / 1000;
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112
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91
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92 ngx_current_msec = (ngx_msec_t) sec * 1000 + msec;
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93
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94 tp = &cached_time[slot];
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0
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95
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112
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96 if (tp->sec == sec) {
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262
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97 tp->msec = msec;
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112
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98 ngx_unlock(&ngx_time_lock);
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99 return;
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100 }
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0
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101
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282
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102 if (slot == NGX_TIME_SLOTS - 1) {
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262
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103 slot = 0;
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104 } else {
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105 slot++;
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106 }
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107
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108 tp = &cached_time[slot];
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109
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112
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110 tp->sec = sec;
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262
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111 tp->msec = msec;
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112
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112
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113 ngx_gmtime(sec, &gmt);
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0
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114
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115
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280
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116 p0 = &cached_http_time[slot][0];
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117
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112
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118 (void) ngx_sprintf(p0, "%s, %02d %s %4d %02d:%02d:%02d GMT",
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119 week[gmt.ngx_tm_wday], gmt.ngx_tm_mday,
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120 months[gmt.ngx_tm_mon - 1], gmt.ngx_tm_year,
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121 gmt.ngx_tm_hour, gmt.ngx_tm_min, gmt.ngx_tm_sec);
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0
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122
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18
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123 #if (NGX_HAVE_GETTIMEZONE)
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124
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112
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125 tp->gmtoff = ngx_gettimezone();
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126 ngx_gmtime(sec + tp->gmtoff * 60, &tm);
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127
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18
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128 #elif (NGX_HAVE_GMTOFF)
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129
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112
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130 ngx_localtime(sec, &tm);
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566
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131 cached_gmtoff = (ngx_int_t) (tm.ngx_tm_gmtoff / 60);
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132 tp->gmtoff = cached_gmtoff;
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0
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133
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134 #else
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135
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112
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136 ngx_localtime(sec, &tm);
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566
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137 cached_gmtoff = ngx_timezone(tm.ngx_tm_isdst);
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138 tp->gmtoff = cached_gmtoff;
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0
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139
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140 #endif
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141
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142
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280
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143 p1 = &cached_err_log_time[slot][0];
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0
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144
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112
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145 (void) ngx_sprintf(p1, "%4d/%02d/%02d %02d:%02d:%02d",
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66
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146 tm.ngx_tm_year, tm.ngx_tm_mon,
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147 tm.ngx_tm_mday, tm.ngx_tm_hour,
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148 tm.ngx_tm_min, tm.ngx_tm_sec);
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0
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149
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150
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280
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151 p2 = &cached_http_log_time[slot][0];
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0
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152
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112
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153 (void) ngx_sprintf(p2, "%02d/%s/%d:%02d:%02d:%02d %c%02d%02d",
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66
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154 tm.ngx_tm_mday, months[tm.ngx_tm_mon - 1],
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155 tm.ngx_tm_year, tm.ngx_tm_hour,
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156 tm.ngx_tm_min, tm.ngx_tm_sec,
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112
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157 tp->gmtoff < 0 ? '-' : '+',
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158 ngx_abs(tp->gmtoff / 60), ngx_abs(tp->gmtoff % 60));
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0
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159
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616
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160 p3 = &cached_http_log_iso8601[slot][0];
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161
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162 (void) ngx_sprintf(p3, "%4d-%02d-%02dT%02d:%02d:%02d%c%02d:%02d",
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163 tm.ngx_tm_year, tm.ngx_tm_mon,
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164 tm.ngx_tm_mday, tm.ngx_tm_hour,
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165 tm.ngx_tm_min, tm.ngx_tm_sec,
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166 tp->gmtoff < 0 ? '-' : '+',
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167 ngx_abs(tp->gmtoff / 60), ngx_abs(tp->gmtoff % 60));
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168
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0
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169
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112
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170 ngx_memory_barrier();
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0
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171
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112
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172 ngx_cached_time = tp;
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173 ngx_cached_http_time.data = p0;
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174 ngx_cached_err_log_time.data = p1;
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175 ngx_cached_http_log_time.data = p2;
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616
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176 ngx_cached_http_log_iso8601.data = p3;
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112
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177
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178 ngx_unlock(&ngx_time_lock);
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0
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179 }
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180
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181
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566
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182 #if !(NGX_WIN32)
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183
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184 void
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185 ngx_time_sigsafe_update(void)
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186 {
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187 u_char *p;
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188 ngx_tm_t tm;
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189 time_t sec;
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190 ngx_time_t *tp;
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191 struct timeval tv;
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192
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193 if (!ngx_trylock(&ngx_time_lock)) {
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194 return;
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195 }
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196
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197 ngx_gettimeofday(&tv);
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198
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199 sec = tv.tv_sec;
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200
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201 tp = &cached_time[slot];
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202
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203 if (tp->sec == sec) {
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204 ngx_unlock(&ngx_time_lock);
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205 return;
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206 }
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207
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208 if (slot == NGX_TIME_SLOTS - 1) {
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209 slot = 0;
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210 } else {
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211 slot++;
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212 }
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213
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214 ngx_gmtime(sec + cached_gmtoff * 60, &tm);
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215
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216 p = &cached_err_log_time[slot][0];
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217
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218 (void) ngx_sprintf(p, "%4d/%02d/%02d %02d:%02d:%02d",
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219 tm.ngx_tm_year, tm.ngx_tm_mon,
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220 tm.ngx_tm_mday, tm.ngx_tm_hour,
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221 tm.ngx_tm_min, tm.ngx_tm_sec);
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222
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223 ngx_memory_barrier();
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224
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225 ngx_cached_err_log_time.data = p;
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226
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227 ngx_unlock(&ngx_time_lock);
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228 }
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229
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230 #endif
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231
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232
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50
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233 u_char *
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234 ngx_http_time(u_char *buf, time_t t)
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0
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235 {
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236 ngx_tm_t tm;
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237
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238 ngx_gmtime(t, &tm);
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239
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4
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240 return ngx_sprintf(buf, "%s, %02d %s %4d %02d:%02d:%02d GMT",
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241 week[tm.ngx_tm_wday],
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242 tm.ngx_tm_mday,
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243 months[tm.ngx_tm_mon - 1],
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244 tm.ngx_tm_year,
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245 tm.ngx_tm_hour,
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246 tm.ngx_tm_min,
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247 tm.ngx_tm_sec);
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0
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248 }
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249
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250
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50
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251 u_char *
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252 ngx_http_cookie_time(u_char *buf, time_t t)
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0
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253 {
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254 ngx_tm_t tm;
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255
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256 ngx_gmtime(t, &tm);
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257
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258 /*
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259 * Netscape 3.x does not understand 4-digit years at all and
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260 * 2-digit years more than "37"
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261 */
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262
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4
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263 return ngx_sprintf(buf,
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264 (tm.ngx_tm_year > 2037) ?
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265 "%s, %02d-%s-%d %02d:%02d:%02d GMT":
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266 "%s, %02d-%s-%02d %02d:%02d:%02d GMT",
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267 week[tm.ngx_tm_wday],
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268 tm.ngx_tm_mday,
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269 months[tm.ngx_tm_mon - 1],
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270 (tm.ngx_tm_year > 2037) ? tm.ngx_tm_year:
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271 tm.ngx_tm_year % 100,
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272 tm.ngx_tm_hour,
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273 tm.ngx_tm_min,
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274 tm.ngx_tm_sec);
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0
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275 }
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276
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277
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50
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278 void
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279 ngx_gmtime(time_t t, ngx_tm_t *tp)
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0
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280 {
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372
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281 ngx_int_t yday;
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282 ngx_uint_t n, sec, min, hour, mday, mon, year, wday, days, leap;
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0
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283
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364
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284 /* the calculation is valid for positive time_t only */
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372
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285
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364
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286 n = (ngx_uint_t) t;
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287
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288 days = n / 86400;
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0
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289
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290 /* Jaunary 1, 1970 was Thursday */
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372
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291
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0
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292 wday = (4 + days) % 7;
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293
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364
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294 n %= 86400;
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295 hour = n / 3600;
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296 n %= 3600;
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297 min = n / 60;
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298 sec = n % 60;
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0
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299
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372
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300 /*
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301 * the algorithm based on Gauss' formula,
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302 * see src/http/ngx_http_parse_time.c
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303 */
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0
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304
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372
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305 /* days since March 1, 1 BC */
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0
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306 days = days - (31 + 28) + 719527;
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307
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372
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308 /*
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309 * The "days" should be adjusted to 1 only, however, some March 1st's go
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310 * to previous year, so we adjust them to 2. This causes also shift of the
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311 * last Feburary days to next year, but we catch the case when "yday"
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312 * becomes negative.
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313 */
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314
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315 year = (days + 2) * 400 / (365 * 400 + 100 - 4 + 1);
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316
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0
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317 yday = days - (365 * year + year / 4 - year / 100 + year / 400);
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318
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372
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319 if (yday < 0) {
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320 leap = (year % 4 == 0) && (year % 100 || (year % 400 == 0));
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321 yday = 365 + leap + yday;
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322 year--;
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323 }
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0
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324
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372
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325 /*
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326 * The empirical formula that maps "yday" to month.
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327 * There are at least 10 variants, some of them are:
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328 * mon = (yday + 31) * 15 / 459
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329 * mon = (yday + 31) * 17 / 520
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330 * mon = (yday + 31) * 20 / 612
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331 */
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332
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333 mon = (yday + 31) * 10 / 306;
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334
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335 /* the Gauss' formula that evaluates days before the month */
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336
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337 mday = yday - (367 * mon / 12 - 30) + 1;
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0
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338
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339 if (yday >= 306) {
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340
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372
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341 year++;
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342 mon -= 10;
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343
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0
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344 /*
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345 * there is no "yday" in Win32 SYSTEMTIME
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346 *
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347 * yday -= 306;
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348 */
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349
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372
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350 } else {
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0
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351
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372
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352 mon += 2;
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0
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353
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372
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354 /*
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355 * there is no "yday" in Win32 SYSTEMTIME
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356 *
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357 * yday += 31 + 28 + leap;
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358 */
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0
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359 }
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360
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361 tp->ngx_tm_sec = (ngx_tm_sec_t) sec;
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362 tp->ngx_tm_min = (ngx_tm_min_t) min;
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363 tp->ngx_tm_hour = (ngx_tm_hour_t) hour;
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364 tp->ngx_tm_mday = (ngx_tm_mday_t) mday;
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365 tp->ngx_tm_mon = (ngx_tm_mon_t) mon;
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366 tp->ngx_tm_year = (ngx_tm_year_t) year;
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367 tp->ngx_tm_wday = (ngx_tm_wday_t) wday;
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368 }
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394
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369
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370
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371 time_t
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372 ngx_next_time(time_t when)
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373 {
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374 time_t now, next;
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375 struct tm tm;
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376
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377 now = ngx_time();
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378
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379 ngx_libc_localtime(now, &tm);
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380
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381 tm.tm_hour = (int) (when / 3600);
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382 when %= 3600;
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383 tm.tm_min = (int) (when / 60);
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384 tm.tm_sec = (int) (when % 60);
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385
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386 next = mktime(&tm);
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387
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388 if (next == -1) {
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389 return -1;
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390 }
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391
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392 if (next - now > 0) {
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393 return next;
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394 }
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395
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396 tm.tm_mday++;
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397
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398 /* mktime() should normalize a date (Jan 32, etc) */
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399
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400 next = mktime(&tm);
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401
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402 if (next != -1) {
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403 return next;
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404 }
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405
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406 return -1;
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407 }
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