Mercurial > hg > nginx-quic
annotate src/core/ngx_times.c @ 8437:d5f93733c17d quic
QUIC: relaxed client id requirements.
Client IDs cannot be reused on different paths. This change allows to reuse
client id previosly seen on the same path (but with different dcid) in case
when no unused client IDs are available.
author | Vladimir Homutov <vl@nginx.com> |
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date | Wed, 05 May 2021 18:11:55 +0300 |
parents | 81fae70d6cb8 |
children | 9e7de0547f09 |
rev | line source |
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441
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1 |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
4412 | 4 * Copyright (C) Nginx, Inc. |
441
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5 */ |
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8 #include <ngx_config.h> |
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9 #include <ngx_core.h> |
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12 static ngx_msec_t ngx_monotonic_time(time_t sec, ngx_uint_t msec); |
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14 |
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15 /* |
563 | 16 * The time may be updated by signal handler or by several threads. |
17 * The time update operations are rare and require to hold the ngx_time_lock. | |
18 * The time read operations are frequent, so they are lock-free and get time | |
19 * values and strings from the current slot. Thus thread may get the corrupted | |
20 * values only if it is preempted while copying and then it is not scheduled | |
21 * to run more than NGX_TIME_SLOTS seconds. | |
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22 */ |
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23 |
563 | 24 #define NGX_TIME_SLOTS 64 |
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25 |
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26 static ngx_uint_t slot; |
563 | 27 static ngx_atomic_t ngx_time_lock; |
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28 |
563 | 29 volatile ngx_msec_t ngx_current_msec; |
30 volatile ngx_time_t *ngx_cached_time; | |
31 volatile ngx_str_t ngx_cached_err_log_time; | |
32 volatile ngx_str_t ngx_cached_http_time; | |
33 volatile ngx_str_t ngx_cached_http_log_time; | |
3873 | 34 volatile ngx_str_t ngx_cached_http_log_iso8601; |
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35 volatile ngx_str_t ngx_cached_syslog_time; |
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36 |
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37 #if !(NGX_WIN32) |
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38 |
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39 /* |
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40 * localtime() and localtime_r() are not Async-Signal-Safe functions, therefore, |
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41 * they must not be called by a signal handler, so we use the cached |
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42 * GMT offset value. Fortunately the value is changed only two times a year. |
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43 */ |
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44 |
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45 static ngx_int_t cached_gmtoff; |
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46 #endif |
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47 |
563 | 48 static ngx_time_t cached_time[NGX_TIME_SLOTS]; |
49 static u_char cached_err_log_time[NGX_TIME_SLOTS] | |
50 [sizeof("1970/09/28 12:00:00")]; | |
51 static u_char cached_http_time[NGX_TIME_SLOTS] | |
52 [sizeof("Mon, 28 Sep 1970 06:00:00 GMT")]; | |
53 static u_char cached_http_log_time[NGX_TIME_SLOTS] | |
54 [sizeof("28/Sep/1970:12:00:00 +0600")]; | |
3873 | 55 static u_char cached_http_log_iso8601[NGX_TIME_SLOTS] |
56 [sizeof("1970-09-28T12:00:00+06:00")]; | |
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57 static u_char cached_syslog_time[NGX_TIME_SLOTS] |
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58 [sizeof("Sep 28 12:00:00")]; |
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59 |
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60 |
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61 static char *week[] = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" }; |
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62 static char *months[] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun", |
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63 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" }; |
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64 |
501 | 65 void |
66 ngx_time_init(void) | |
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67 { |
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68 ngx_cached_err_log_time.len = sizeof("1970/09/28 12:00:00") - 1; |
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69 ngx_cached_http_time.len = sizeof("Mon, 28 Sep 1970 06:00:00 GMT") - 1; |
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70 ngx_cached_http_log_time.len = sizeof("28/Sep/1970:12:00:00 +0600") - 1; |
3873 | 71 ngx_cached_http_log_iso8601.len = sizeof("1970-09-28T12:00:00+06:00") - 1; |
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72 ngx_cached_syslog_time.len = sizeof("Sep 28 12:00:00") - 1; |
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73 |
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74 ngx_cached_time = &cached_time[0]; |
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75 |
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76 ngx_time_update(); |
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77 } |
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78 |
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79 |
563 | 80 void |
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81 ngx_time_update(void) |
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82 { |
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83 u_char *p0, *p1, *p2, *p3, *p4; |
563 | 84 ngx_tm_t tm, gmt; |
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85 time_t sec; |
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86 ngx_uint_t msec; |
563 | 87 ngx_time_t *tp; |
88 struct timeval tv; | |
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89 |
563 | 90 if (!ngx_trylock(&ngx_time_lock)) { |
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91 return; |
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92 } |
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93 |
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94 ngx_gettimeofday(&tv); |
563 | 95 |
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96 sec = tv.tv_sec; |
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97 msec = tv.tv_usec / 1000; |
563 | 98 |
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99 ngx_current_msec = ngx_monotonic_time(sec, msec); |
563 | 100 |
101 tp = &cached_time[slot]; | |
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102 |
563 | 103 if (tp->sec == sec) { |
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104 tp->msec = msec; |
563 | 105 ngx_unlock(&ngx_time_lock); |
106 return; | |
107 } | |
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108 |
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109 if (slot == NGX_TIME_SLOTS - 1) { |
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110 slot = 0; |
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111 } else { |
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112 slot++; |
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113 } |
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114 |
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115 tp = &cached_time[slot]; |
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116 |
563 | 117 tp->sec = sec; |
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118 tp->msec = msec; |
563 | 119 |
120 ngx_gmtime(sec, &gmt); | |
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121 |
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123 p0 = &cached_http_time[slot][0]; |
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124 |
563 | 125 (void) ngx_sprintf(p0, "%s, %02d %s %4d %02d:%02d:%02d GMT", |
126 week[gmt.ngx_tm_wday], gmt.ngx_tm_mday, | |
127 months[gmt.ngx_tm_mon - 1], gmt.ngx_tm_year, | |
128 gmt.ngx_tm_hour, gmt.ngx_tm_min, gmt.ngx_tm_sec); | |
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129 |
469 | 130 #if (NGX_HAVE_GETTIMEZONE) |
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131 |
563 | 132 tp->gmtoff = ngx_gettimezone(); |
133 ngx_gmtime(sec + tp->gmtoff * 60, &tm); | |
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134 |
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135 #elif (NGX_HAVE_GMTOFF) |
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136 |
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137 ngx_localtime(sec, &tm); |
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138 cached_gmtoff = (ngx_int_t) (tm.ngx_tm_gmtoff / 60); |
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139 tp->gmtoff = cached_gmtoff; |
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140 |
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141 #else |
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142 |
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143 ngx_localtime(sec, &tm); |
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144 cached_gmtoff = ngx_timezone(tm.ngx_tm_isdst); |
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145 tp->gmtoff = cached_gmtoff; |
178
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146 |
323
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147 #endif |
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148 |
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149 |
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150 p1 = &cached_err_log_time[slot][0]; |
323
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151 |
563 | 152 (void) ngx_sprintf(p1, "%4d/%02d/%02d %02d:%02d:%02d", |
517 | 153 tm.ngx_tm_year, tm.ngx_tm_mon, |
154 tm.ngx_tm_mday, tm.ngx_tm_hour, | |
155 tm.ngx_tm_min, tm.ngx_tm_sec); | |
182
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156 |
323
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157 |
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158 p2 = &cached_http_log_time[slot][0]; |
323
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159 |
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160 (void) ngx_sprintf(p2, "%02d/%s/%d:%02d:%02d:%02d %c%02i%02i", |
517 | 161 tm.ngx_tm_mday, months[tm.ngx_tm_mon - 1], |
162 tm.ngx_tm_year, tm.ngx_tm_hour, | |
163 tm.ngx_tm_min, tm.ngx_tm_sec, | |
563 | 164 tp->gmtoff < 0 ? '-' : '+', |
165 ngx_abs(tp->gmtoff / 60), ngx_abs(tp->gmtoff % 60)); | |
323
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166 |
3873 | 167 p3 = &cached_http_log_iso8601[slot][0]; |
168 | |
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169 (void) ngx_sprintf(p3, "%4d-%02d-%02dT%02d:%02d:%02d%c%02i:%02i", |
3873 | 170 tm.ngx_tm_year, tm.ngx_tm_mon, |
171 tm.ngx_tm_mday, tm.ngx_tm_hour, | |
172 tm.ngx_tm_min, tm.ngx_tm_sec, | |
173 tp->gmtoff < 0 ? '-' : '+', | |
174 ngx_abs(tp->gmtoff / 60), ngx_abs(tp->gmtoff % 60)); | |
175 | |
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176 p4 = &cached_syslog_time[slot][0]; |
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177 |
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178 (void) ngx_sprintf(p4, "%s %2d %02d:%02d:%02d", |
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179 months[tm.ngx_tm_mon - 1], tm.ngx_tm_mday, |
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180 tm.ngx_tm_hour, tm.ngx_tm_min, tm.ngx_tm_sec); |
266
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181 |
563 | 182 ngx_memory_barrier(); |
266
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183 |
563 | 184 ngx_cached_time = tp; |
185 ngx_cached_http_time.data = p0; | |
186 ngx_cached_err_log_time.data = p1; | |
187 ngx_cached_http_log_time.data = p2; | |
3873 | 188 ngx_cached_http_log_iso8601.data = p3; |
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189 ngx_cached_syslog_time.data = p4; |
563 | 190 |
191 ngx_unlock(&ngx_time_lock); | |
178
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192 } |
182
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193 |
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194 |
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195 static ngx_msec_t |
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196 ngx_monotonic_time(time_t sec, ngx_uint_t msec) |
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197 { |
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198 #if (NGX_HAVE_CLOCK_MONOTONIC) |
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199 struct timespec ts; |
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200 |
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201 #if defined(CLOCK_MONOTONIC_FAST) |
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202 clock_gettime(CLOCK_MONOTONIC_FAST, &ts); |
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203 |
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204 #elif defined(CLOCK_MONOTONIC_COARSE) |
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205 clock_gettime(CLOCK_MONOTONIC_COARSE, &ts); |
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206 |
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207 #else |
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208 clock_gettime(CLOCK_MONOTONIC, &ts); |
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209 #endif |
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210 |
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211 sec = ts.tv_sec; |
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212 msec = ts.tv_nsec / 1000000; |
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213 |
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214 #endif |
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215 |
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216 return (ngx_msec_t) sec * 1000 + msec; |
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217 } |
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218 |
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219 |
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220 #if !(NGX_WIN32) |
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221 |
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222 void |
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223 ngx_time_sigsafe_update(void) |
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224 { |
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225 u_char *p, *p2; |
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226 ngx_tm_t tm; |
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227 time_t sec; |
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228 ngx_time_t *tp; |
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229 struct timeval tv; |
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230 |
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231 if (!ngx_trylock(&ngx_time_lock)) { |
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232 return; |
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233 } |
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234 |
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235 ngx_gettimeofday(&tv); |
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236 |
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237 sec = tv.tv_sec; |
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238 |
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239 tp = &cached_time[slot]; |
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240 |
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241 if (tp->sec == sec) { |
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242 ngx_unlock(&ngx_time_lock); |
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243 return; |
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244 } |
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245 |
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246 if (slot == NGX_TIME_SLOTS - 1) { |
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247 slot = 0; |
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248 } else { |
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249 slot++; |
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250 } |
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251 |
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252 tp = &cached_time[slot]; |
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253 |
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254 tp->sec = 0; |
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255 |
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256 ngx_gmtime(sec + cached_gmtoff * 60, &tm); |
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257 |
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258 p = &cached_err_log_time[slot][0]; |
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259 |
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260 (void) ngx_sprintf(p, "%4d/%02d/%02d %02d:%02d:%02d", |
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261 tm.ngx_tm_year, tm.ngx_tm_mon, |
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262 tm.ngx_tm_mday, tm.ngx_tm_hour, |
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263 tm.ngx_tm_min, tm.ngx_tm_sec); |
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264 |
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265 p2 = &cached_syslog_time[slot][0]; |
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266 |
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267 (void) ngx_sprintf(p2, "%s %2d %02d:%02d:%02d", |
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268 months[tm.ngx_tm_mon - 1], tm.ngx_tm_mday, |
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269 tm.ngx_tm_hour, tm.ngx_tm_min, tm.ngx_tm_sec); |
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270 |
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271 ngx_memory_barrier(); |
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272 |
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273 ngx_cached_err_log_time.data = p; |
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274 ngx_cached_syslog_time.data = p2; |
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275 |
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276 ngx_unlock(&ngx_time_lock); |
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277 } |
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278 |
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279 #endif |
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280 |
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281 |
501 | 282 u_char * |
283 ngx_http_time(u_char *buf, time_t t) | |
182
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284 { |
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285 ngx_tm_t tm; |
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286 |
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287 ngx_gmtime(t, &tm); |
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288 |
455 | 289 return ngx_sprintf(buf, "%s, %02d %s %4d %02d:%02d:%02d GMT", |
290 week[tm.ngx_tm_wday], | |
291 tm.ngx_tm_mday, | |
292 months[tm.ngx_tm_mon - 1], | |
293 tm.ngx_tm_year, | |
294 tm.ngx_tm_hour, | |
295 tm.ngx_tm_min, | |
296 tm.ngx_tm_sec); | |
409
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297 } |
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298 |
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299 |
501 | 300 u_char * |
301 ngx_http_cookie_time(u_char *buf, time_t t) | |
409
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302 { |
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303 ngx_tm_t tm; |
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304 |
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305 ngx_gmtime(t, &tm); |
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306 |
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307 /* |
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308 * Netscape 3.x does not understand 4-digit years at all and |
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309 * 2-digit years more than "37" |
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310 */ |
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311 |
455 | 312 return ngx_sprintf(buf, |
313 (tm.ngx_tm_year > 2037) ? | |
314 "%s, %02d-%s-%d %02d:%02d:%02d GMT": | |
315 "%s, %02d-%s-%02d %02d:%02d:%02d GMT", | |
316 week[tm.ngx_tm_wday], | |
317 tm.ngx_tm_mday, | |
318 months[tm.ngx_tm_mon - 1], | |
319 (tm.ngx_tm_year > 2037) ? tm.ngx_tm_year: | |
320 tm.ngx_tm_year % 100, | |
321 tm.ngx_tm_hour, | |
322 tm.ngx_tm_min, | |
323 tm.ngx_tm_sec); | |
182
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324 } |
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325 |
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326 |
501 | 327 void |
328 ngx_gmtime(time_t t, ngx_tm_t *tp) | |
182
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329 { |
1970
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330 ngx_int_t yday; |
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331 ngx_uint_t sec, min, hour, mday, mon, year, wday, days, leap; |
182
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332 |
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333 /* the calculation is valid for positive time_t only */ |
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334 |
7103
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335 if (t < 0) { |
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336 t = 0; |
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337 } |
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338 |
7103
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339 days = t / 86400; |
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340 sec = t % 86400; |
182
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341 |
7104
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342 /* |
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343 * no more than 4 year digits supported, |
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344 * truncate to December 31, 9999, 23:59:59 |
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345 */ |
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346 |
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347 if (days > 2932896) { |
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348 days = 2932896; |
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349 sec = 86399; |
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350 } |
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351 |
4499
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Fixed spelling in single-line comments.
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|
352 /* January 1, 1970 was Thursday */ |
1970
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353 |
182
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354 wday = (4 + days) % 7; |
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355 |
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356 hour = sec / 3600; |
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357 sec %= 3600; |
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358 min = sec / 60; |
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359 sec %= 60; |
182
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360 |
1970
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361 /* |
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362 * the algorithm based on Gauss' formula, |
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|
363 * see src/core/ngx_parse_time.c |
1970
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364 */ |
208
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365 |
1970
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366 /* days since March 1, 1 BC */ |
182
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367 days = days - (31 + 28) + 719527; |
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368 |
1970
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369 /* |
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370 * The "days" should be adjusted to 1 only, however, some March 1st's go |
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371 * to previous year, so we adjust them to 2. This causes also shift of the |
4572
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Fixed spelling in multiline C comments.
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|
372 * last February days to next year, but we catch the case when "yday" |
1970
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373 * becomes negative. |
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374 */ |
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375 |
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376 year = (days + 2) * 400 / (365 * 400 + 100 - 4 + 1); |
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377 |
182
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378 yday = days - (365 * year + year / 4 - year / 100 + year / 400); |
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379 |
1970
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380 if (yday < 0) { |
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381 leap = (year % 4 == 0) && (year % 100 || (year % 400 == 0)); |
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382 yday = 365 + leap + yday; |
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383 year--; |
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384 } |
182
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385 |
1970
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386 /* |
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387 * The empirical formula that maps "yday" to month. |
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388 * There are at least 10 variants, some of them are: |
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389 * mon = (yday + 31) * 15 / 459 |
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390 * mon = (yday + 31) * 17 / 520 |
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391 * mon = (yday + 31) * 20 / 612 |
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392 */ |
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393 |
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394 mon = (yday + 31) * 10 / 306; |
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|
395 |
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|
396 /* the Gauss' formula that evaluates days before the month */ |
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|
397 |
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398 mday = yday - (367 * mon / 12 - 30) + 1; |
182
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399 |
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400 if (yday >= 306) { |
441
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401 |
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402 year++; |
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403 mon -= 10; |
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404 |
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405 /* |
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406 * there is no "yday" in Win32 SYSTEMTIME |
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407 * |
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408 * yday -= 306; |
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409 */ |
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410 |
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411 } else { |
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412 |
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413 mon += 2; |
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414 |
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415 /* |
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416 * there is no "yday" in Win32 SYSTEMTIME |
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417 * |
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418 * yday += 31 + 28 + leap; |
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419 */ |
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420 } |
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421 |
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422 tp->ngx_tm_sec = (ngx_tm_sec_t) sec; |
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423 tp->ngx_tm_min = (ngx_tm_min_t) min; |
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424 tp->ngx_tm_hour = (ngx_tm_hour_t) hour; |
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425 tp->ngx_tm_mday = (ngx_tm_mday_t) mday; |
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426 tp->ngx_tm_mon = (ngx_tm_mon_t) mon; |
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427 tp->ngx_tm_year = (ngx_tm_year_t) year; |
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428 tp->ngx_tm_wday = (ngx_tm_wday_t) wday; |
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429 } |
2162 | 430 |
431 | |
432 time_t | |
433 ngx_next_time(time_t when) | |
434 { | |
435 time_t now, next; | |
436 struct tm tm; | |
437 | |
438 now = ngx_time(); | |
439 | |
440 ngx_libc_localtime(now, &tm); | |
441 | |
442 tm.tm_hour = (int) (when / 3600); | |
443 when %= 3600; | |
444 tm.tm_min = (int) (when / 60); | |
445 tm.tm_sec = (int) (when % 60); | |
446 | |
447 next = mktime(&tm); | |
448 | |
449 if (next == -1) { | |
450 return -1; | |
451 } | |
452 | |
453 if (next - now > 0) { | |
454 return next; | |
455 } | |
456 | |
457 tm.tm_mday++; | |
458 | |
459 /* mktime() should normalize a date (Jan 32, etc) */ | |
460 | |
461 next = mktime(&tm); | |
462 | |
463 if (next != -1) { | |
464 return next; | |
465 } | |
466 | |
467 return -1; | |
468 } |