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