aboutsummaryrefslogtreecommitdiffstats
path: root/include/apr_time.h
blob: b0efd791c98a27ebcac399c55689c1ed24df7050 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
/* 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 */