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