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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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106
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11 ngx_msec_t ngx_current_time;
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0
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12
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106
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13 ngx_int_t ngx_gmtoff;
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58
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14
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0
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15 static ngx_tm_t ngx_cached_gmtime;
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16
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17
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18 /*
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19 * In the threaded mode only one thread updates the cached time and strings
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20 * and these operations are protected by the mutex. The reading of the cached
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21 * time and strings is not protected by the mutex. To avoid the race
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22 * conditions for non-atomic values we use the NGX_TIME_SLOTS slots to store
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23 * time value and strings. Thus thread may get the corrupted values only
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24 * if it is preempted while copying and then it is not scheduled to run
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25 * more than NGX_TIME_SLOTS seconds.
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26 */
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27
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28 #if (NGX_THREADS)
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29
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30 #define NGX_TIME_SLOTS 60
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31 static ngx_uint_t slot = NGX_TIME_SLOTS;
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32
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33 static ngx_mutex_t *ngx_time_mutex;
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34
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35 #else
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36
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37 #define NGX_TIME_SLOTS 1
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38 #define slot 0
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39
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40 #endif
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41
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42
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26
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43 #if (NGX_THREADS && (NGX_TIME_T_SIZE > NGX_SIG_ATOMIC_T_SIZE))
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44
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45 volatile time_t *ngx_cached_time;
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46 static time_t cached_time[NGX_TIME_SLOTS];
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47
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48 #else
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49
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50 volatile time_t ngx_cached_time;
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51
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52 #endif
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53
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54
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55 ngx_thread_volatile ngx_str_t ngx_cached_err_log_time;
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56 ngx_thread_volatile ngx_str_t ngx_cached_http_time;
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57 ngx_thread_volatile ngx_str_t ngx_cached_http_log_time;
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58
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59
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60 static u_char cached_err_log_time[NGX_TIME_SLOTS]
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74
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61 [sizeof("1970/09/28 12:00:00")];
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0
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62 static u_char cached_http_time[NGX_TIME_SLOTS]
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74
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63 [sizeof("Mon, 28 Sep 1970 06:00:00 GMT")];
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64 static u_char cached_http_log_time[NGX_TIME_SLOTS]
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74
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65 [sizeof("28/Sep/1970:12:00:00 +0600")];
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0
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66
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67
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68 static char *week[] = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };
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69 static char *months[] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
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70 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
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71
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50
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72 void
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73 ngx_time_init(void)
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0
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74 {
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75 struct timeval tv;
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76
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77 ngx_memzero(&ngx_cached_gmtime, sizeof(ngx_tm_t));
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78 #ifdef ngx_tm_zone
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79 ngx_cached_gmtime.ngx_tm_zone = "GMT";
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80 #endif
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81
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82 ngx_cached_err_log_time.len = sizeof("1970/09/28 12:00:00") - 1;
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83 ngx_cached_http_time.len = sizeof("Mon, 28 Sep 1970 06:00:00 GMT") - 1;
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84 ngx_cached_http_log_time.len = sizeof("28/Sep/1970:12:00:00 +0600") - 1;
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85
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26
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86 #if (NGX_THREADS && (NGX_TIME_T_SIZE > NGX_SIG_ATOMIC_T_SIZE))
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87 ngx_cached_time = &cached_time[0];
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88 #endif
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89
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90 ngx_gettimeofday(&tv);
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91
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106
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92 ngx_current_time = (ngx_msec_t) tv.tv_sec * 1000 + tv.tv_usec / 1000;
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93
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10
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94 #if !(NGX_WIN32)
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95 tzset();
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96 #endif
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97
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98 ngx_time_update(tv.tv_sec);
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99 }
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100
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101
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102 #if (NGX_THREADS)
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103
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50
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104 ngx_int_t
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105 ngx_time_mutex_init(ngx_log_t *log)
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106 {
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107 ngx_time_mutex = ngx_mutex_init(log, NGX_MUTEX_LIGHT);
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108
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109 if (ngx_time_mutex == NULL) {
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110 return NGX_ERROR;
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111 }
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112
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113 return NGX_OK;
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114 }
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115
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116 #endif
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117
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118
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50
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119 void
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120 ngx_time_update(time_t s)
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121 {
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122 u_char *p;
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123 ngx_tm_t tm;
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124
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125 if (ngx_time() == s) {
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126 return;
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127 }
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128
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129 #if (NGX_THREADS)
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130
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131 if (ngx_mutex_trylock(ngx_time_mutex) != NGX_OK) {
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132 return;
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133 }
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134
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135 if (slot == NGX_TIME_SLOTS) {
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136 slot = 0;
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137 } else {
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138 slot++;
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139 }
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140
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26
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141 #if (NGX_THREADS && (NGX_TIME_T_SIZE > NGX_SIG_ATOMIC_T_SIZE))
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142 ngx_cached_time = &cached_time[slot];
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143 #endif
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144
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145 #endif
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146
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147 ngx_time() = s;
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148
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149 ngx_gmtime(s, &ngx_cached_gmtime);
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150
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151
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152 p = cached_http_time[slot];
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153
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154 (void) ngx_sprintf(p, "%s, %02d %s %4d %02d:%02d:%02d GMT",
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155 week[ngx_cached_gmtime.ngx_tm_wday],
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156 ngx_cached_gmtime.ngx_tm_mday,
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157 months[ngx_cached_gmtime.ngx_tm_mon - 1],
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158 ngx_cached_gmtime.ngx_tm_year,
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159 ngx_cached_gmtime.ngx_tm_hour,
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160 ngx_cached_gmtime.ngx_tm_min,
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161 ngx_cached_gmtime.ngx_tm_sec);
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162
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163 ngx_cached_http_time.data = p;
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164
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165
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18
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166 #if (NGX_HAVE_GETTIMEZONE)
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167
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168 ngx_gmtoff = ngx_gettimezone();
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169 ngx_gmtime(s + ngx_gmtoff * 60, &tm);
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170
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18
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171 #elif (NGX_HAVE_GMTOFF)
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172
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173 ngx_localtime(&tm);
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174 ngx_gmtoff = (ngx_int_t) (tm.ngx_tm_gmtoff / 60);
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175
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176 #else
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177
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178 ngx_localtime(&tm);
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179 ngx_gmtoff = ngx_timezone(tm.ngx_tm_isdst);
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180
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181 #endif
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182
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183
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184 p = cached_err_log_time[slot];
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185
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66
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186 (void) ngx_sprintf(p, "%4d/%02d/%02d %02d:%02d:%02d",
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187 tm.ngx_tm_year, tm.ngx_tm_mon,
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188 tm.ngx_tm_mday, tm.ngx_tm_hour,
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189 tm.ngx_tm_min, tm.ngx_tm_sec);
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190
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191 ngx_cached_err_log_time.data = p;
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192
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193
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194 p = cached_http_log_time[slot];
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195
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196 (void) ngx_sprintf(p, "%02d/%s/%d:%02d:%02d:%02d %c%02d%02d",
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197 tm.ngx_tm_mday, months[tm.ngx_tm_mon - 1],
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198 tm.ngx_tm_year, tm.ngx_tm_hour,
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199 tm.ngx_tm_min, tm.ngx_tm_sec,
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200 ngx_gmtoff < 0 ? '-' : '+',
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201 abs(ngx_gmtoff / 60), abs(ngx_gmtoff % 60));
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202
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203 ngx_cached_http_log_time.data = p;
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204
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205
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206 #if (NGX_THREADS)
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207 ngx_mutex_unlock(ngx_time_mutex);
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208 #endif
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209
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210 }
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211
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212
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213 u_char *
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214 ngx_http_time(u_char *buf, time_t t)
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215 {
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216 ngx_tm_t tm;
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217
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218 ngx_gmtime(t, &tm);
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219
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220 return ngx_sprintf(buf, "%s, %02d %s %4d %02d:%02d:%02d GMT",
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221 week[tm.ngx_tm_wday],
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222 tm.ngx_tm_mday,
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223 months[tm.ngx_tm_mon - 1],
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224 tm.ngx_tm_year,
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225 tm.ngx_tm_hour,
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226 tm.ngx_tm_min,
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227 tm.ngx_tm_sec);
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228 }
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229
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230
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231 u_char *
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232 ngx_http_cookie_time(u_char *buf, time_t t)
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233 {
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234 ngx_tm_t tm;
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235
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236 ngx_gmtime(t, &tm);
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237
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238 /*
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239 * Netscape 3.x does not understand 4-digit years at all and
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240 * 2-digit years more than "37"
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241 */
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242
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243 return ngx_sprintf(buf,
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244 (tm.ngx_tm_year > 2037) ?
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245 "%s, %02d-%s-%d %02d:%02d:%02d GMT":
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246 "%s, %02d-%s-%02d %02d:%02d:%02d GMT",
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247 week[tm.ngx_tm_wday],
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248 tm.ngx_tm_mday,
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249 months[tm.ngx_tm_mon - 1],
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250 (tm.ngx_tm_year > 2037) ? tm.ngx_tm_year:
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251 tm.ngx_tm_year % 100,
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252 tm.ngx_tm_hour,
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253 tm.ngx_tm_min,
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254 tm.ngx_tm_sec);
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255 }
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256
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257
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258 void
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259 ngx_gmtime(time_t t, ngx_tm_t *tp)
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260 {
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261 ngx_int_t sec, min, hour, mday, mon, year, wday, yday, days;
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262
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263 days = t / 86400;
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264
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265 /* Jaunary 1, 1970 was Thursday */
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266 wday = (4 + days) % 7;
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267
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268 t %= 86400;
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269 hour = t / 3600;
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270 t %= 3600;
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271 min = t / 60;
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272 sec = t % 60;
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273
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274 /* the algorithm based on Gauss's formula */
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275
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276 days = days - (31 + 28) + 719527;
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277
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278 year = days * 400 / (365 * 400 + 100 - 4 + 1);
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279 yday = days - (365 * year + year / 4 - year / 100 + year / 400);
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280
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281 mon = (yday + 31) * 12 / 367;
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282 mday = yday - (mon * 367 / 12 - 31);
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283
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284 mon += 2;
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285
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286 if (yday >= 306) {
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287
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288 /*
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289 * there is no "yday" in Win32 SYSTEMTIME
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290 *
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291 * yday -= 306;
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292 */
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293
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294 year++;
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295 mon -= 12;
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296
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297 if (mday == 0) {
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298 /* Jaunary 31 */
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299 mon = 1;
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300 mday = 31;
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301
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302 } else if (mon == 2) {
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303
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304 if ((year % 4 == 0) && (year % 100 || (year % 400 == 0))) {
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305 if (mday > 29) {
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306 mon = 3;
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307 mday -= 29;
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308 }
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309
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310 } else if (mday > 28) {
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311 mon = 3;
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312 mday -= 28;
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313 }
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314 }
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315 /*
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316 * there is no "yday" in Win32 SYSTEMTIME
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317 *
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318 * } else {
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319 * yday += 31 + 28;
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320 *
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321 * if ((year % 4 == 0) && (year % 100 || (year % 400 == 0))) {
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38
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322 * yday++;
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0
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323 * }
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324 */
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325 }
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326
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327 tp->ngx_tm_sec = (ngx_tm_sec_t) sec;
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328 tp->ngx_tm_min = (ngx_tm_min_t) min;
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329 tp->ngx_tm_hour = (ngx_tm_hour_t) hour;
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330 tp->ngx_tm_mday = (ngx_tm_mday_t) mday;
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331 tp->ngx_tm_mon = (ngx_tm_mon_t) mon;
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332 tp->ngx_tm_year = (ngx_tm_year_t) year;
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333 tp->ngx_tm_wday = (ngx_tm_wday_t) wday;
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334 }
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