1 /* SPDX-License-Identifier: LGPL-2.1+ */
5 This file is part of systemd.
7 Copyright 2010 Lennart Poettering
9 systemd is free software; you can redistribute it and/or modify it
10 under the terms of the GNU Lesser General Public License as published by
11 the Free Software Foundation; either version 2.1 of the License, or
12 (at your option) any later version.
14 systemd is distributed in the hope that it will be useful, but
15 WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 Lesser General Public License for more details.
19 You should have received a copy of the GNU Lesser General Public License
20 along with systemd; If not, see <http://www.gnu.org/licenses/>.
30 typedef uint64_t usec_t;
31 typedef uint64_t nsec_t;
33 #define PRI_NSEC PRIu64
34 #define PRI_USEC PRIu64
35 #define NSEC_FMT "%" PRI_NSEC
36 #define USEC_FMT "%" PRI_USEC
40 typedef struct dual_timestamp {
45 typedef struct triple_timestamp {
51 #define USEC_INFINITY ((usec_t) -1)
52 #define NSEC_INFINITY ((nsec_t) -1)
54 #define MSEC_PER_SEC 1000ULL
55 #define USEC_PER_SEC ((usec_t) 1000000ULL)
56 #define USEC_PER_MSEC ((usec_t) 1000ULL)
57 #define NSEC_PER_SEC ((nsec_t) 1000000000ULL)
58 #define NSEC_PER_MSEC ((nsec_t) 1000000ULL)
59 #define NSEC_PER_USEC ((nsec_t) 1000ULL)
61 #define USEC_PER_MINUTE ((usec_t) (60ULL*USEC_PER_SEC))
62 #define NSEC_PER_MINUTE ((nsec_t) (60ULL*NSEC_PER_SEC))
63 #define USEC_PER_HOUR ((usec_t) (60ULL*USEC_PER_MINUTE))
64 #define NSEC_PER_HOUR ((nsec_t) (60ULL*NSEC_PER_MINUTE))
65 #define USEC_PER_DAY ((usec_t) (24ULL*USEC_PER_HOUR))
66 #define NSEC_PER_DAY ((nsec_t) (24ULL*NSEC_PER_HOUR))
67 #define USEC_PER_WEEK ((usec_t) (7ULL*USEC_PER_DAY))
68 #define NSEC_PER_WEEK ((nsec_t) (7ULL*NSEC_PER_DAY))
69 #define USEC_PER_MONTH ((usec_t) (2629800ULL*USEC_PER_SEC))
70 #define NSEC_PER_MONTH ((nsec_t) (2629800ULL*NSEC_PER_SEC))
71 #define USEC_PER_YEAR ((usec_t) (31557600ULL*USEC_PER_SEC))
72 #define NSEC_PER_YEAR ((nsec_t) (31557600ULL*NSEC_PER_SEC))
74 /* We assume a maximum timezone length of 6. TZNAME_MAX is not defined on Linux, but glibc internally initializes this
75 * to 6. Let's rely on that. */
76 #define FORMAT_TIMESTAMP_MAX (3+1+10+1+8+1+6+1+6+1)
77 #define FORMAT_TIMESTAMP_WIDTH 28 /* when outputting, assume this width */
78 #define FORMAT_TIMESTAMP_RELATIVE_MAX 256
79 #define FORMAT_TIMESPAN_MAX 64
81 #define TIME_T_MAX (time_t)((UINTMAX_C(1) << ((sizeof(time_t) << 3) - 1)) - 1)
83 #define DUAL_TIMESTAMP_NULL ((struct dual_timestamp) {})
84 #define TRIPLE_TIMESTAMP_NULL ((struct triple_timestamp) {})
86 usec_t now(clockid_t clock);
87 #if 0 /// UNNEEDED by elogind
88 nsec_t now_nsec(clockid_t clock);
91 dual_timestamp* dual_timestamp_get(dual_timestamp *ts);
92 dual_timestamp* dual_timestamp_from_realtime(dual_timestamp *ts, usec_t u);
93 #if 0 /// UNNEEDED by elogind
94 dual_timestamp* dual_timestamp_from_monotonic(dual_timestamp *ts, usec_t u);
95 dual_timestamp* dual_timestamp_from_boottime_or_monotonic(dual_timestamp *ts, usec_t u);
98 triple_timestamp* triple_timestamp_get(triple_timestamp *ts);
99 triple_timestamp* triple_timestamp_from_realtime(triple_timestamp *ts, usec_t u);
101 #define DUAL_TIMESTAMP_HAS_CLOCK(clock) \
102 IN_SET(clock, CLOCK_REALTIME, CLOCK_REALTIME_ALARM, CLOCK_MONOTONIC)
104 #define TRIPLE_TIMESTAMP_HAS_CLOCK(clock) \
105 IN_SET(clock, CLOCK_REALTIME, CLOCK_REALTIME_ALARM, CLOCK_MONOTONIC, CLOCK_BOOTTIME, CLOCK_BOOTTIME_ALARM)
107 static inline bool dual_timestamp_is_set(const dual_timestamp *ts) {
108 return ((ts->realtime > 0 && ts->realtime != USEC_INFINITY) ||
109 (ts->monotonic > 0 && ts->monotonic != USEC_INFINITY));
112 static inline bool triple_timestamp_is_set(const triple_timestamp *ts) {
113 return ((ts->realtime > 0 && ts->realtime != USEC_INFINITY) ||
114 (ts->monotonic > 0 && ts->monotonic != USEC_INFINITY) ||
115 (ts->boottime > 0 && ts->boottime != USEC_INFINITY));
118 usec_t triple_timestamp_by_clock(triple_timestamp *ts, clockid_t clock);
120 usec_t timespec_load(const struct timespec *ts) _pure_;
121 #if 0 /// UNNEEDED by elogind
122 nsec_t timespec_load_nsec(const struct timespec *ts) _pure_;
124 struct timespec *timespec_store(struct timespec *ts, usec_t u);
126 usec_t timeval_load(const struct timeval *tv) _pure_;
127 struct timeval *timeval_store(struct timeval *tv, usec_t u);
129 char *format_timestamp(char *buf, size_t l, usec_t t);
130 #if 0 /// UNNEEDED by elogind
131 char *format_timestamp_utc(char *buf, size_t l, usec_t t);
133 char *format_timestamp_us(char *buf, size_t l, usec_t t);
134 #if 0 /// UNNEEDED by elogind
135 char *format_timestamp_us_utc(char *buf, size_t l, usec_t t);
137 char *format_timestamp_relative(char *buf, size_t l, usec_t t);
138 char *format_timespan(char *buf, size_t l, usec_t t, usec_t accuracy);
140 #if 0 /// UNNEEDED by elogind
141 void dual_timestamp_serialize(FILE *f, const char *name, dual_timestamp *t);
142 int dual_timestamp_deserialize(const char *value, dual_timestamp *t);
144 int timestamp_deserialize(const char *value, usec_t *timestamp);
146 #if 0 /// UNNEEDED by elogind
147 int parse_timestamp(const char *t, usec_t *usec);
150 int parse_sec(const char *t, usec_t *usec);
151 #if 0 /// UNNEEDED by elogind
152 int parse_sec_fix_0(const char *t, usec_t *usec);
154 int parse_time(const char *t, usec_t *usec, usec_t default_unit);
155 #if 0 /// UNNEEDED by elogind
156 int parse_nsec(const char *t, nsec_t *nsec);
158 bool ntp_synced(void);
160 int get_timezones(char ***l);
161 bool timezone_is_valid(const char *name);
164 bool clock_boottime_supported(void);
165 bool clock_supported(clockid_t clock);
166 #if 0 /// UNNEEDED by elogind
167 clockid_t clock_boottime_or_monotonic(void);
169 usec_t usec_shift_clock(usec_t, clockid_t from, clockid_t to);
172 #if 0 /// UNNEEDED by elogind
173 int get_timezone(char **timezone);
175 time_t mktime_or_timegm(struct tm *tm, bool utc);
177 struct tm *localtime_or_gmtime_r(const time_t *t, struct tm *tm, bool utc);
179 #if 0 /// UNNEEDED by elogind
180 unsigned long usec_to_jiffies(usec_t usec);
183 bool in_utc_timezone(void);
185 static inline usec_t usec_add(usec_t a, usec_t b) {
188 /* Adds two time values, and makes sure USEC_INFINITY as input results as USEC_INFINITY in output, and doesn't
192 if (c < a || c < b) /* overflow check */
193 return USEC_INFINITY;
198 static inline usec_t usec_sub_unsigned(usec_t timestamp, usec_t delta) {
200 if (timestamp == USEC_INFINITY) /* Make sure infinity doesn't degrade */
201 return USEC_INFINITY;
202 if (timestamp < delta)
205 return timestamp - delta;
208 static inline usec_t usec_sub_signed(usec_t timestamp, int64_t delta) {
210 return usec_add(timestamp, (usec_t) (-delta));
212 return usec_sub_unsigned(timestamp, (usec_t) delta);
215 #if SIZEOF_TIME_T == 8
216 /* The last second we can format is 31. Dec 9999, 1s before midnight, because otherwise we'd enter 5 digit year
217 * territory. However, since we want to stay away from this in all timezones we take one day off. */
218 #define USEC_TIMESTAMP_FORMATTABLE_MAX ((usec_t) 253402214399000000)
219 #elif SIZEOF_TIME_T == 4
220 /* With a 32bit time_t we can't go beyond 2038... */
221 #define USEC_TIMESTAMP_FORMATTABLE_MAX ((usec_t) 2147483647000000)
223 #error "Yuck, time_t is neither 4 not 8 bytes wide?"