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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 ngx_epoch_msec_t ngx_elapsed_msec;
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12 ngx_epoch_msec_t ngx_old_elapsed_msec;
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13 ngx_epoch_msec_t ngx_start_msec;
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14
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15 static ngx_tm_t ngx_cached_gmtime;
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16 static ngx_int_t ngx_gmtoff;
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17
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18
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19 /*
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20 * In the threaded mode only one thread updates the cached time and strings
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21 * and these operations are protected by the mutex. The reading of the cached
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22 * time and strings is not protected by the mutex. To avoid the race
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23 * conditions for non-atomic values we use the NGX_TIME_SLOTS slots to store
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24 * time value and strings. Thus thread may get the corrupted values only
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25 * if it is preempted while copying and then it is not scheduled to run
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26 * more than NGX_TIME_SLOTS seconds.
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27 */
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28
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29 #if (NGX_THREADS)
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30
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31 #define NGX_TIME_SLOTS 60
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32 static ngx_uint_t slot = NGX_TIME_SLOTS;
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33
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34 static ngx_mutex_t *ngx_time_mutex;
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35
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36 #else
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37
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38 #define NGX_TIME_SLOTS 1
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39 #define slot 0
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40
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41 #endif
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42
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43
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44 #if (NGX_THREADS && (TIME_T_SIZE > SIG_ATOMIC_T_SIZE))
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45
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46 volatile time_t *ngx_cached_time;
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47 static time_t cached_time[NGX_TIME_SLOTS];
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48
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49 #else
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50
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51 volatile time_t ngx_cached_time;
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52
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53 #endif
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54
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55
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56 ngx_thread_volatile ngx_str_t ngx_cached_err_log_time;
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57 ngx_thread_volatile ngx_str_t ngx_cached_http_time;
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58 ngx_thread_volatile ngx_str_t ngx_cached_http_log_time;
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59
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60
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61 static u_char cached_err_log_time[NGX_TIME_SLOTS]
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62 [sizeof("1970/09/28 12:00:00")];
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63 static u_char cached_http_time[NGX_TIME_SLOTS]
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64 [sizeof("Mon, 28 Sep 1970 06:00:00 GMT")];
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65 static u_char cached_http_log_time[NGX_TIME_SLOTS]
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66 [sizeof("28/Sep/1970:12:00:00 +0600")];
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67
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68
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69 static char *week[] = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };
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70 static char *months[] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
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71 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
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72
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73
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74 void ngx_time_init()
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75 {
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76 struct timeval tv;
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77
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78 ngx_memzero(&ngx_cached_gmtime, sizeof(ngx_tm_t));
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79 #ifdef ngx_tm_zone
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80 ngx_cached_gmtime.ngx_tm_zone = "GMT";
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81 #endif
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82
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83 ngx_cached_err_log_time.len = sizeof("1970/09/28 12:00:00") - 1;
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84 ngx_cached_http_time.len = sizeof("Mon, 28 Sep 1970 06:00:00 GMT") - 1;
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85 ngx_cached_http_log_time.len = sizeof("28/Sep/1970:12:00:00 +0600") - 1;
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86
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87 #if (NGX_THREADS && (TIME_T_SIZE > SIG_ATOMIC_T_SIZE))
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88 ngx_cached_time = &cached_time[0];
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89 #endif
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90
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91 ngx_gettimeofday(&tv);
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92
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93 ngx_start_msec = (ngx_epoch_msec_t) tv.tv_sec * 1000 + tv.tv_usec / 1000;
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94 ngx_old_elapsed_msec = 0;
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95 ngx_elapsed_msec = 0;
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96
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97 #if !(WIN32)
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98 tzset();
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99 #endif
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100
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101 ngx_time_update(tv.tv_sec);
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102 }
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103
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104
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105 #if (NGX_THREADS)
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106
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107 ngx_int_t ngx_time_mutex_init(ngx_log_t *log)
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108 {
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109 if (!(ngx_time_mutex = ngx_mutex_init(log, NGX_MUTEX_LIGHT))) {
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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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119 void ngx_time_update(time_t s)
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120 {
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121 u_char *p;
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122 ngx_tm_t tm;
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123
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124 if (ngx_time() == s) {
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125 return;
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126 }
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127
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128 #if (NGX_THREADS)
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129
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130 if (ngx_mutex_trylock(ngx_time_mutex) != NGX_OK) {
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131 return;
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132 }
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133
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134 if (slot == NGX_TIME_SLOTS) {
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135 slot = 0;
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136 } else {
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137 slot++;
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138 }
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139
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140 #if (NGX_THREADS && (TIME_T_SIZE > SIG_ATOMIC_T_SIZE))
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141 ngx_cached_time = &cached_time[slot];
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142 #endif
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143
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144 #endif
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145
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146 ngx_time() = s;
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147
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148 ngx_gmtime(s, &ngx_cached_gmtime);
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149
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150
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151 p = cached_http_time[slot];
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152
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153 ngx_snprintf((char *) p, sizeof("Mon, 28 Sep 1970 06:00:00 GMT"),
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154 "%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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166 #if (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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171 #elif (HAVE_GMTOFF)
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172
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173 ngx_localtime(&tm);
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174 ngx_gmtoff = 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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186 ngx_snprintf((char *) p, sizeof("1970/09/28 12:00:00"),
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187 "%4d/%02d/%02d %02d:%02d:%02d",
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188 tm.ngx_tm_year, tm.ngx_tm_mon,
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189 tm.ngx_tm_mday, tm.ngx_tm_hour,
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190 tm.ngx_tm_min, tm.ngx_tm_sec);
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191
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192 ngx_cached_err_log_time.data = p;
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193
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194
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195 p = cached_http_log_time[slot];
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196
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197 ngx_snprintf((char *) p, sizeof("28/Sep/1970:12:00:00 +0600"),
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198 "%02d/%s/%d:%02d:%02d:%02d %c%02d%02d",
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199 tm.ngx_tm_mday, months[tm.ngx_tm_mon - 1],
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200 tm.ngx_tm_year, tm.ngx_tm_hour,
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201 tm.ngx_tm_min, tm.ngx_tm_sec,
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202 ngx_gmtoff < 0 ? '-' : '+',
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203 abs(ngx_gmtoff / 60), abs(ngx_gmtoff % 60));
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204
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205 ngx_cached_http_log_time.data = p;
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206
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207
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208 #if (NGX_THREADS)
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209 ngx_mutex_unlock(ngx_time_mutex);
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210 #endif
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211
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212 }
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213
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214
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215 size_t ngx_http_time(u_char *buf, time_t t)
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216 {
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217 ngx_tm_t tm;
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218
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219 ngx_gmtime(t, &tm);
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220
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221 return ngx_snprintf((char *) buf, sizeof("Mon, 28 Sep 1970 06:00:00 GMT"),
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222 "%s, %02d %s %4d %02d:%02d:%02d GMT",
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223 week[tm.ngx_tm_wday],
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224 tm.ngx_tm_mday,
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225 months[tm.ngx_tm_mon - 1],
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226 tm.ngx_tm_year,
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227 tm.ngx_tm_hour,
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228 tm.ngx_tm_min,
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229 tm.ngx_tm_sec);
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230 }
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231
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232
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233 size_t ngx_http_cookie_time(u_char *buf, time_t t)
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234 {
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235 ngx_tm_t tm;
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236
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237 ngx_gmtime(t, &tm);
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238
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239 /*
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240 * Netscape 3.x does not understand 4-digit years at all and
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241 * 2-digit years more than "37"
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242 */
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243
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244 if (tm.ngx_tm_year > 2037) {
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245 return ngx_snprintf((char *) buf,
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246 sizeof("Mon, 28-Sep-1970 06:00:00 GMT"),
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247 "%s, %02d-%s-%d %02d:%02d:%02d GMT",
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248 week[tm.ngx_tm_wday],
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249 tm.ngx_tm_mday,
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250 months[tm.ngx_tm_mon - 1],
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251 tm.ngx_tm_year,
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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 } else {
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256 return ngx_snprintf((char *) buf,
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257 sizeof("Mon, 28-Sep-70 06:00:00 GMT"),
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258 "%s, %02d-%s-%02d %02d:%02d:%02d GMT",
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259 week[tm.ngx_tm_wday],
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260 tm.ngx_tm_mday,
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261 months[tm.ngx_tm_mon - 1],
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262 tm.ngx_tm_year % 100,
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263 tm.ngx_tm_hour,
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264 tm.ngx_tm_min,
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265 tm.ngx_tm_sec);
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266 }
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267 }
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268
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269
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270 void ngx_gmtime(time_t t, ngx_tm_t *tp)
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271 {
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272 ngx_int_t sec, min, hour, mday, mon, year, wday, yday, days;
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273
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274 days = t / 86400;
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275
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276 /* Jaunary 1, 1970 was Thursday */
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277 wday = (4 + days) % 7;
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278
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279 t %= 86400;
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280 hour = t / 3600;
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281 t %= 3600;
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282 min = t / 60;
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283 sec = t % 60;
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284
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285 /* the algorithm based on Gauss's formula */
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286
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287 days = days - (31 + 28) + 719527;
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288
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289 year = days * 400 / (365 * 400 + 100 - 4 + 1);
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290 yday = days - (365 * year + year / 4 - year / 100 + year / 400);
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291
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292 mon = (yday + 31) * 12 / 367;
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293 mday = yday - (mon * 367 / 12 - 31);
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294
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295 mon += 2;
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296
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297 if (yday >= 306) {
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298
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299 /*
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300 * there is no "yday" in Win32 SYSTEMTIME
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301 *
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302 * yday -= 306;
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303 */
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304
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305 year++;
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306 mon -= 12;
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307
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308 if (mday == 0) {
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309 /* Jaunary 31 */
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310 mon = 1;
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311 mday = 31;
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312
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313 } else if (mon == 2) {
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314
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315 if ((year % 4 == 0) && (year % 100 || (year % 400 == 0))) {
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316 if (mday > 29) {
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317 mon = 3;
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318 mday -= 29;
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319 }
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320
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321 } else if (mday > 28) {
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322 mon = 3;
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323 mday -= 28;
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324 }
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325 }
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326
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327 /*
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328 * there is no "yday" in Win32 SYSTEMTIME
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329 *
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330 * } else {
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331 * yday += 31 + 28;
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332 *
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333 * if ((year % 4 == 0) && (year % 100 || (year % 400 == 0))) {
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334 * yday++;
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335 * }
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336 */
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337 }
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338
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339 tp->ngx_tm_sec = (ngx_tm_sec_t) sec;
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340 tp->ngx_tm_min = (ngx_tm_min_t) min;
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341 tp->ngx_tm_hour = (ngx_tm_hour_t) hour;
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342 tp->ngx_tm_mday = (ngx_tm_mday_t) mday;
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343 tp->ngx_tm_mon = (ngx_tm_mon_t) mon;
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344 tp->ngx_tm_year = (ngx_tm_year_t) year;
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345 tp->ngx_tm_wday = (ngx_tm_wday_t) wday;
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346 }
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