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apr-1
apr_time.h
/* Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #ifndef APR_TIME_H #define APR_TIME_H /** * @file apr_time.h * @brief APR Time Library */ #include "apr.h" #include "apr_errno.h" #ifdef __cplusplus extern "C" { #endif /* __cplusplus */ /** * @defgroup apr_time Time Routines * @ingroup APR * @{ */ /** month names */ APR_DECLARE_DATA extern const char apr_month_snames[12][4]; /** day names */ APR_DECLARE_DATA extern const char apr_day_snames[7][4]; /** number of microseconds since 00:00:00 January 1, 1970 UTC */ typedef apr_int64_t apr_time_t; /** mechanism to properly type apr_time_t literals */ #define APR_TIME_C(val) APR_INT64_C(val) /** mechanism to properly print apr_time_t values */ #define APR_TIME_T_FMT APR_INT64_T_FMT /** intervals for I/O timeouts, in microseconds */ typedef apr_int64_t apr_interval_time_t; /** short interval for I/O timeouts, in microseconds */ typedef apr_int32_t apr_short_interval_time_t; /** number of microseconds per second */ #define APR_USEC_PER_SEC APR_TIME_C(1000000) /** @return apr_time_t as a second */ #define apr_time_sec(time) ((time) / APR_USEC_PER_SEC) /** @return apr_time_t as a usec */ #define apr_time_usec(time) ((time) % APR_USEC_PER_SEC) /** @return apr_time_t as a msec */ #define apr_time_msec(time) (((time) / 1000) % 1000) /** @return apr_time_t as a msec */ #define apr_time_as_msec(time) ((time) / 1000) /** @return milliseconds as an apr_time_t */ #define apr_time_from_msec(msec) ((apr_time_t)(msec) * 1000) /** @return seconds as an apr_time_t */ #define apr_time_from_sec(sec) ((apr_time_t)(sec) * APR_USEC_PER_SEC) /** @return a second and usec combination as an apr_time_t */ #define apr_time_make(sec, usec) ((apr_time_t)(sec) * APR_USEC_PER_SEC \ + (apr_time_t)(usec)) /** * @return the current time */ APR_DECLARE(apr_time_t) apr_time_now(void); /** @see apr_time_exp_t */ typedef struct apr_time_exp_t apr_time_exp_t; /** * a structure similar to ANSI struct tm with the following differences: * - tm_usec isn't an ANSI field * - tm_gmtoff isn't an ANSI field (it's a BSDism) */ struct apr_time_exp_t { /** microseconds past tm_sec */ apr_int32_t tm_usec; /** (0-61) seconds past tm_min */ apr_int32_t tm_sec; /** (0-59) minutes past tm_hour */ apr_int32_t tm_min; /** (0-23) hours past midnight */ apr_int32_t tm_hour; /** (1-31) day of the month */ apr_int32_t tm_mday; /** (0-11) month of the year */ apr_int32_t tm_mon; /** year since 1900 */ apr_int32_t tm_year; /** (0-6) days since Sunday */ apr_int32_t tm_wday; /** (0-365) days since January 1 */ apr_int32_t tm_yday; /** daylight saving time */ apr_int32_t tm_isdst; /** seconds east of UTC */ apr_int32_t tm_gmtoff; }; /* Delayed the include to avoid a circular reference */ #include "apr_pools.h" /** * Convert an ansi time_t to an apr_time_t * @param result the resulting apr_time_t * @param input the time_t to convert */ APR_DECLARE(apr_status_t) apr_time_ansi_put(apr_time_t *result, time_t input); /** * Convert a time to its human readable components using an offset * from GMT. * @param result the exploded time * @param input the time to explode * @param offs the number of seconds offset to apply */ APR_DECLARE(apr_status_t) apr_time_exp_tz(apr_time_exp_t *result, apr_time_t input, apr_int32_t offs); /** * Convert a time to its human readable components (GMT). * @param result the exploded time * @param input the time to explode */ APR_DECLARE(apr_status_t) apr_time_exp_gmt(apr_time_exp_t *result, apr_time_t input); /** * Convert a time to its human readable components in the local timezone. * @param result the exploded time * @param input the time to explode */ APR_DECLARE(apr_status_t) apr_time_exp_lt(apr_time_exp_t *result, apr_time_t input); /** * Convert time value from human readable format to a numeric apr_time_t * (elapsed microseconds since the epoch). * @param result the resulting imploded time * @param input the input exploded time */ APR_DECLARE(apr_status_t) apr_time_exp_get(apr_time_t *result, apr_time_exp_t *input); /** * Convert time value from human readable format to a numeric apr_time_t that * always represents GMT. * @param result the resulting imploded time * @param input the input exploded time */ APR_DECLARE(apr_status_t) apr_time_exp_gmt_get(apr_time_t *result, apr_time_exp_t *input); /** * Sleep for the specified number of micro-seconds. * @param t desired amount of time to sleep. * @warning May sleep for longer than the specified time. */ APR_DECLARE(void) apr_sleep(apr_interval_time_t t); /** length of a RFC822 Date */ #define APR_RFC822_DATE_LEN (30) /** * apr_rfc822_date formats dates in the RFC822 * format in an efficient manner. It is a fixed length * format which requires APR_RFC822_DATA_LEN bytes of storage, * including the trailing NUL terminator. * @param date_str String to write to. * @param t the time to convert */ APR_DECLARE(apr_status_t) apr_rfc822_date(char *date_str, apr_time_t t); /** length of a CTIME date */ #define APR_CTIME_LEN (25) /** * apr_ctime formats dates in the ctime() format * in an efficient manner. It is a fixed length format * and requires APR_CTIME_LEN bytes of storage including * the trailing NUL terminator. * Unlike ANSI/ISO C ctime(), apr_ctime() does not include * a \\n at the end of the string. * @param date_str String to write to. * @param t the time to convert */ APR_DECLARE(apr_status_t) apr_ctime(char *date_str, apr_time_t t); /** * Formats the exploded time according to the format specified * @param s string to write to * @param retsize The length of the returned string * @param max The maximum length of the string * @param format The format for the time string * @param tm The time to convert */ APR_DECLARE(apr_status_t) apr_strftime(char *s, apr_size_t *retsize, apr_size_t max, const char *format, apr_time_exp_t *tm); /** * Improve the clock resolution for the lifetime of the given pool. * Generally this is only desirable on benchmarking and other very * time-sensitive applications, and has no impact on most platforms. * @param p The pool to associate the finer clock resolution */ APR_DECLARE(void) apr_time_clock_hires(apr_pool_t *p); /** @} */ #ifdef __cplusplus } #endif #endif /* ! APR_TIME_H */
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