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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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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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0
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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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0
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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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579
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31 #if !(NGX_WIN32)
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32
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33 /*
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34 * locatime() and localtime_r() are not Async-Signal-Safe functions, therefore,
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35 * they must not be called by a signal handler, so we use the cached
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36 * GMT offset value. Fortunately the value is changed only two times a year.
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37 */
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38
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39 static ngx_int_t cached_gmtoff;
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40 #endif
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41
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112
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42 static ngx_time_t cached_time[NGX_TIME_SLOTS];
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43 static u_char cached_err_log_time[NGX_TIME_SLOTS]
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44 [sizeof("1970/09/28 12:00:00")];
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45 static u_char cached_http_time[NGX_TIME_SLOTS]
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46 [sizeof("Mon, 28 Sep 1970 06:00:00 GMT")];
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47 static u_char cached_http_log_time[NGX_TIME_SLOTS]
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48 [sizeof("28/Sep/1970:12:00:00 +0600")];
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0
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49
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50
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51 static char *week[] = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };
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52 static char *months[] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
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53 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
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54
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50
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55 void
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56 ngx_time_init(void)
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0
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57 {
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58 ngx_cached_err_log_time.len = sizeof("1970/09/28 12:00:00") - 1;
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59 ngx_cached_http_time.len = sizeof("Mon, 28 Sep 1970 06:00:00 GMT") - 1;
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60 ngx_cached_http_log_time.len = sizeof("28/Sep/1970:12:00:00 +0600") - 1;
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61
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62 ngx_cached_time = &cached_time[0];
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63
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579
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64 ngx_time_update();
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0
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65 }
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66
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67
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112
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68 void
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579
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69 ngx_time_update(void)
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0
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70 {
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112
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71 u_char *p0, *p1, *p2;
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72 ngx_tm_t tm, gmt;
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579
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73 time_t sec;
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74 ngx_uint_t msec;
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112
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75 ngx_time_t *tp;
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76 struct timeval tv;
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77
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112
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78 if (!ngx_trylock(&ngx_time_lock)) {
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79 return;
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80 }
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81
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579
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82 ngx_gettimeofday(&tv);
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112
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83
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579
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84 sec = tv.tv_sec;
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85 msec = tv.tv_usec / 1000;
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112
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86
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87 ngx_current_msec = (ngx_msec_t) sec * 1000 + msec;
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88
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89 tp = &cached_time[slot];
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90
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112
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91 if (tp->sec == sec) {
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262
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92 tp->msec = msec;
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112
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93 ngx_unlock(&ngx_time_lock);
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94 return;
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95 }
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96
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282
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97 if (slot == NGX_TIME_SLOTS - 1) {
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262
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98 slot = 0;
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99 } else {
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100 slot++;
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101 }
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102
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103 tp = &cached_time[slot];
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104
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112
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105 tp->sec = sec;
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262
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106 tp->msec = msec;
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112
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107
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108 ngx_gmtime(sec, &gmt);
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109
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110
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280
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111 p0 = &cached_http_time[slot][0];
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0
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112
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112
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113 (void) ngx_sprintf(p0, "%s, %02d %s %4d %02d:%02d:%02d GMT",
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114 week[gmt.ngx_tm_wday], gmt.ngx_tm_mday,
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115 months[gmt.ngx_tm_mon - 1], gmt.ngx_tm_year,
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116 gmt.ngx_tm_hour, gmt.ngx_tm_min, gmt.ngx_tm_sec);
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117
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18
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118 #if (NGX_HAVE_GETTIMEZONE)
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119
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112
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120 tp->gmtoff = ngx_gettimezone();
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121 ngx_gmtime(sec + tp->gmtoff * 60, &tm);
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122
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18
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123 #elif (NGX_HAVE_GMTOFF)
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124
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112
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125 ngx_localtime(sec, &tm);
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579
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126 cached_gmtoff = (ngx_int_t) (tm.ngx_tm_gmtoff / 60);
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127 tp->gmtoff = cached_gmtoff;
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128
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129 #else
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130
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112
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131 ngx_localtime(sec, &tm);
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132 cached_gmtoff = ngx_timezone(tm.ngx_tm_isdst);
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133 tp->gmtoff = cached_gmtoff;
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0
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134
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135 #endif
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136
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137
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280
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138 p1 = &cached_err_log_time[slot][0];
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139
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112
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140 (void) ngx_sprintf(p1, "%4d/%02d/%02d %02d:%02d:%02d",
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66
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141 tm.ngx_tm_year, tm.ngx_tm_mon,
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142 tm.ngx_tm_mday, tm.ngx_tm_hour,
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143 tm.ngx_tm_min, tm.ngx_tm_sec);
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0
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144
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145
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280
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146 p2 = &cached_http_log_time[slot][0];
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147
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112
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148 (void) ngx_sprintf(p2, "%02d/%s/%d:%02d:%02d:%02d %c%02d%02d",
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66
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149 tm.ngx_tm_mday, months[tm.ngx_tm_mon - 1],
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150 tm.ngx_tm_year, tm.ngx_tm_hour,
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151 tm.ngx_tm_min, tm.ngx_tm_sec,
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112
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152 tp->gmtoff < 0 ? '-' : '+',
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153 ngx_abs(tp->gmtoff / 60), ngx_abs(tp->gmtoff % 60));
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0
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154
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155
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112
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156 ngx_memory_barrier();
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0
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157
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112
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158 ngx_cached_time = tp;
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159 ngx_cached_http_time.data = p0;
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160 ngx_cached_err_log_time.data = p1;
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161 ngx_cached_http_log_time.data = p2;
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162
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163 ngx_unlock(&ngx_time_lock);
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0
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164 }
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165
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166
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579
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167 #if !(NGX_WIN32)
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168
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169 void
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170 ngx_time_sigsafe_update(void)
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171 {
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172 u_char *p;
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173 ngx_tm_t tm;
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174 time_t sec;
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175 ngx_uint_t msec;
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176 ngx_time_t *tp;
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177 struct timeval tv;
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178
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179 if (!ngx_trylock(&ngx_time_lock)) {
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180 return;
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181 }
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182
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183 ngx_gettimeofday(&tv);
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184
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185 sec = tv.tv_sec;
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186 msec = tv.tv_usec / 1000;
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187
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188 tp = &cached_time[slot];
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189
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190 if (tp->sec == sec) {
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191 ngx_unlock(&ngx_time_lock);
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192 return;
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193 }
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194
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195 if (slot == NGX_TIME_SLOTS - 1) {
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196 slot = 0;
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197 } else {
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198 slot++;
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199 }
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200
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201 ngx_gmtime(sec + cached_gmtoff * 60, &tm);
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202
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203 p = &cached_err_log_time[slot][0];
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204
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205 (void) ngx_sprintf(p, "%4d/%02d/%02d %02d:%02d:%02d",
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206 tm.ngx_tm_year, tm.ngx_tm_mon,
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207 tm.ngx_tm_mday, tm.ngx_tm_hour,
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208 tm.ngx_tm_min, tm.ngx_tm_sec);
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209
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210 ngx_memory_barrier();
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211
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212 ngx_cached_err_log_time.data = p;
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213
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214 ngx_unlock(&ngx_time_lock);
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215 }
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216
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217 #endif
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218
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219
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50
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220 u_char *
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221 ngx_http_time(u_char *buf, time_t t)
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0
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222 {
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223 ngx_tm_t tm;
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224
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225 ngx_gmtime(t, &tm);
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226
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4
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227 return ngx_sprintf(buf, "%s, %02d %s %4d %02d:%02d:%02d GMT",
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228 week[tm.ngx_tm_wday],
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229 tm.ngx_tm_mday,
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230 months[tm.ngx_tm_mon - 1],
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231 tm.ngx_tm_year,
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232 tm.ngx_tm_hour,
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233 tm.ngx_tm_min,
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234 tm.ngx_tm_sec);
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0
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235 }
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236
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237
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50
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238 u_char *
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239 ngx_http_cookie_time(u_char *buf, time_t t)
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0
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240 {
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241 ngx_tm_t tm;
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242
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243 ngx_gmtime(t, &tm);
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244
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245 /*
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246 * Netscape 3.x does not understand 4-digit years at all and
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247 * 2-digit years more than "37"
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248 */
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249
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4
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250 return ngx_sprintf(buf,
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251 (tm.ngx_tm_year > 2037) ?
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252 "%s, %02d-%s-%d %02d:%02d:%02d GMT":
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253 "%s, %02d-%s-%02d %02d:%02d:%02d GMT",
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254 week[tm.ngx_tm_wday],
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255 tm.ngx_tm_mday,
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256 months[tm.ngx_tm_mon - 1],
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257 (tm.ngx_tm_year > 2037) ? tm.ngx_tm_year:
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258 tm.ngx_tm_year % 100,
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259 tm.ngx_tm_hour,
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260 tm.ngx_tm_min,
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261 tm.ngx_tm_sec);
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0
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262 }
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263
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264
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50
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265 void
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266 ngx_gmtime(time_t t, ngx_tm_t *tp)
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0
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267 {
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372
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268 ngx_int_t yday;
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269 ngx_uint_t n, sec, min, hour, mday, mon, year, wday, days, leap;
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0
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270
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364
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271 /* the calculation is valid for positive time_t only */
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372
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272
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364
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273 n = (ngx_uint_t) t;
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274
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275 days = n / 86400;
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0
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276
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277 /* Jaunary 1, 1970 was Thursday */
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372
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278
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0
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279 wday = (4 + days) % 7;
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280
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364
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281 n %= 86400;
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282 hour = n / 3600;
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283 n %= 3600;
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284 min = n / 60;
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285 sec = n % 60;
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0
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286
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372
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287 /*
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288 * the algorithm based on Gauss' formula,
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289 * see src/http/ngx_http_parse_time.c
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290 */
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0
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291
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372
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292 /* days since March 1, 1 BC */
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0
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293 days = days - (31 + 28) + 719527;
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294
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372
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295 /*
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296 * The "days" should be adjusted to 1 only, however, some March 1st's go
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297 * to previous year, so we adjust them to 2. This causes also shift of the
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298 * last Feburary days to next year, but we catch the case when "yday"
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299 * becomes negative.
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300 */
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301
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302 year = (days + 2) * 400 / (365 * 400 + 100 - 4 + 1);
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303
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0
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304 yday = days - (365 * year + year / 4 - year / 100 + year / 400);
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305
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372
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306 if (yday < 0) {
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307 leap = (year % 4 == 0) && (year % 100 || (year % 400 == 0));
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308 yday = 365 + leap + yday;
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309 year--;
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310 }
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0
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311
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372
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312 /*
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313 * The empirical formula that maps "yday" to month.
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314 * There are at least 10 variants, some of them are:
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315 * mon = (yday + 31) * 15 / 459
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316 * mon = (yday + 31) * 17 / 520
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317 * mon = (yday + 31) * 20 / 612
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318 */
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319
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320 mon = (yday + 31) * 10 / 306;
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321
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322 /* the Gauss' formula that evaluates days before the month */
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323
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324 mday = yday - (367 * mon / 12 - 30) + 1;
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0
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325
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326 if (yday >= 306) {
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327
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372
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328 year++;
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329 mon -= 10;
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330
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0
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331 /*
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332 * there is no "yday" in Win32 SYSTEMTIME
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333 *
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334 * yday -= 306;
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335 */
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336
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372
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337 } else {
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0
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338
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372
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339 mon += 2;
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0
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340
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372
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341 /*
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342 * there is no "yday" in Win32 SYSTEMTIME
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343 *
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344 * yday += 31 + 28 + leap;
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345 */
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0
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346 }
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347
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348 tp->ngx_tm_sec = (ngx_tm_sec_t) sec;
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349 tp->ngx_tm_min = (ngx_tm_min_t) min;
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350 tp->ngx_tm_hour = (ngx_tm_hour_t) hour;
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351 tp->ngx_tm_mday = (ngx_tm_mday_t) mday;
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352 tp->ngx_tm_mon = (ngx_tm_mon_t) mon;
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353 tp->ngx_tm_year = (ngx_tm_year_t) year;
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354 tp->ngx_tm_wday = (ngx_tm_wday_t) wday;
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355 }
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397
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356
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357
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358 time_t
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359 ngx_next_time(time_t when)
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360 {
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361 time_t now, next;
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362 struct tm tm;
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363
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364 now = ngx_time();
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365
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366 ngx_libc_localtime(now, &tm);
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367
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368 tm.tm_hour = (int) (when / 3600);
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369 when %= 3600;
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370 tm.tm_min = (int) (when / 60);
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371 tm.tm_sec = (int) (when % 60);
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372
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373 next = mktime(&tm);
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374
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375 if (next == -1) {
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376 return -1;
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377 }
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378
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379 if (next - now > 0) {
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380 return next;
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381 }
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382
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383 tm.tm_mday++;
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384
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385 /* mktime() should normalize a date (Jan 32, etc) */
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386
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387 next = mktime(&tm);
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388
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389 if (next != -1) {
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390 return next;
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391 }
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392
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393 return -1;
|
|
|
394 }
|
