1 /* Licensed to the Apache Software Foundation (ASF) under one or more
2 * contributor license agreements. See the NOTICE file distributed with
3 * this work for additional information regarding copyright ownership.
4 * The ASF licenses this file to You under the Apache License, Version 2.0
5 * (the "License"); you may not use this file except in compliance with
6 * the License. You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
22 * @brief APR Time Library
26 #include "apr_errno.h"
30 #endif /* __cplusplus */
33 * @defgroup apr_time Time Routines
39 APR_DECLARE_DATA extern const char apr_month_snames[12][4];
41 APR_DECLARE_DATA extern const char apr_day_snames[7][4];
44 /** number of microseconds since 00:00:00 January 1, 1970 UTC */
45 typedef apr_int64_t apr_time_t;
48 /** mechanism to properly type apr_time_t literals */
49 #define APR_TIME_C(val) APR_INT64_C(val)
51 /** mechanism to properly print apr_time_t values */
52 #define APR_TIME_T_FMT APR_INT64_T_FMT
54 /** intervals for I/O timeouts, in microseconds */
55 typedef apr_int64_t apr_interval_time_t;
56 /** short interval for I/O timeouts, in microseconds */
57 typedef apr_int32_t apr_short_interval_time_t;
59 /** number of microseconds per second */
60 #define APR_USEC_PER_SEC APR_TIME_C(1000000)
62 /** @return apr_time_t as a second */
63 #define apr_time_sec(time) ((time) / APR_USEC_PER_SEC)
65 /** @return apr_time_t as a usec */
66 #define apr_time_usec(time) ((time) % APR_USEC_PER_SEC)
68 /** @return apr_time_t as a msec */
69 #define apr_time_msec(time) (((time) / 1000) % 1000)
71 /** @return apr_time_t as a msec */
72 #define apr_time_as_msec(time) ((time) / 1000)
74 /** @return milliseconds as an apr_time_t */
75 #define apr_time_from_msec(msec) ((apr_time_t)(msec) * 1000)
77 /** @return seconds as an apr_time_t */
78 #define apr_time_from_sec(sec) ((apr_time_t)(sec) * APR_USEC_PER_SEC)
80 /** @return a second and usec combination as an apr_time_t */
81 #define apr_time_make(sec, usec) ((apr_time_t)(sec) * APR_USEC_PER_SEC \
85 * @return the current time
87 APR_DECLARE(apr_time_t) apr_time_now(void);
89 /** @see apr_time_exp_t */
90 typedef struct apr_time_exp_t apr_time_exp_t;
93 * a structure similar to ANSI struct tm with the following differences:
94 * - tm_usec isn't an ANSI field
95 * - tm_gmtoff isn't an ANSI field (it's a BSDism)
97 struct apr_time_exp_t {
98 /** microseconds past tm_sec */
100 /** (0-61) seconds past tm_min */
102 /** (0-59) minutes past tm_hour */
104 /** (0-23) hours past midnight */
106 /** (1-31) day of the month */
108 /** (0-11) month of the year */
110 /** year since 1900 */
112 /** (0-6) days since Sunday */
114 /** (0-365) days since January 1 */
116 /** daylight saving time */
117 apr_int32_t tm_isdst;
118 /** seconds east of UTC */
119 apr_int32_t tm_gmtoff;
122 /* Delayed the include to avoid a circular reference */
123 #include "apr_pools.h"
126 * Convert an ansi time_t to an apr_time_t
127 * @param result the resulting apr_time_t
128 * @param input the time_t to convert
130 APR_DECLARE(apr_status_t) apr_time_ansi_put(apr_time_t *result,
134 * Convert a time to its human readable components using an offset
136 * @param result the exploded time
137 * @param input the time to explode
138 * @param offs the number of seconds offset to apply
140 APR_DECLARE(apr_status_t) apr_time_exp_tz(apr_time_exp_t *result,
145 * Convert a time to its human readable components (GMT).
146 * @param result the exploded time
147 * @param input the time to explode
149 APR_DECLARE(apr_status_t) apr_time_exp_gmt(apr_time_exp_t *result,
153 * Convert a time to its human readable components in the local timezone.
154 * @param result the exploded time
155 * @param input the time to explode
157 APR_DECLARE(apr_status_t) apr_time_exp_lt(apr_time_exp_t *result,
161 * Convert time value from human readable format to a numeric apr_time_t
162 * (elapsed microseconds since the epoch).
163 * @param result the resulting imploded time
164 * @param input the input exploded time
166 APR_DECLARE(apr_status_t) apr_time_exp_get(apr_time_t *result,
167 apr_time_exp_t *input);
170 * Convert time value from human readable format to a numeric apr_time_t that
171 * always represents GMT.
172 * @param result the resulting imploded time
173 * @param input the input exploded time
175 APR_DECLARE(apr_status_t) apr_time_exp_gmt_get(apr_time_t *result,
176 apr_time_exp_t *input);
179 * Sleep for the specified number of micro-seconds.
180 * @param t desired amount of time to sleep.
181 * @warning May sleep for longer than the specified time.
183 APR_DECLARE(void) apr_sleep(apr_interval_time_t t);
185 /** length of a RFC822 Date */
186 #define APR_RFC822_DATE_LEN (30)
188 * apr_rfc822_date formats dates in the RFC822
189 * format in an efficient manner. It is a fixed length
190 * format which requires APR_RFC822_DATA_LEN bytes of storage,
191 * including the trailing NUL terminator.
192 * @param date_str String to write to.
193 * @param t the time to convert
195 APR_DECLARE(apr_status_t) apr_rfc822_date(char *date_str, apr_time_t t);
197 /** length of a CTIME date */
198 #define APR_CTIME_LEN (25)
200 * apr_ctime formats dates in the ctime() format
201 * in an efficient manner. It is a fixed length format
202 * and requires APR_CTIME_LEN bytes of storage including
203 * the trailing NUL terminator.
204 * Unlike ANSI/ISO C ctime(), apr_ctime() does not include
205 * a \\n at the end of the string.
206 * @param date_str String to write to.
207 * @param t the time to convert
209 APR_DECLARE(apr_status_t) apr_ctime(char *date_str, apr_time_t t);
212 * Formats the exploded time according to the format specified
213 * @param s string to write to
214 * @param retsize The length of the returned string
215 * @param max The maximum length of the string
216 * @param format The format for the time string
217 * @param tm The time to convert
219 APR_DECLARE(apr_status_t) apr_strftime(char *s, apr_size_t *retsize,
220 apr_size_t max, const char *format,
224 * Improve the clock resolution for the lifetime of the given pool.
225 * Generally this is only desirable on benchmarking and other very
226 * time-sensitive applications, and has no impact on most platforms.
227 * @param p The pool to associate the finer clock resolution
229 APR_DECLARE(void) apr_time_clock_hires(apr_pool_t *p);
237 #endif /* ! APR_TIME_H */