4 This file is part of systemd.
6 Copyright 2010 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
29 typedef uint64_t usec_t;
30 typedef uint64_t nsec_t;
32 #define NSEC_FMT "%" PRIu64
33 #define USEC_FMT "%" PRIu64
37 typedef struct dual_timestamp {
42 typedef struct triple_timestamp {
48 #define USEC_INFINITY ((usec_t) -1)
49 #define NSEC_INFINITY ((nsec_t) -1)
51 #define MSEC_PER_SEC 1000ULL
52 #define USEC_PER_SEC ((usec_t) 1000000ULL)
53 #define USEC_PER_MSEC ((usec_t) 1000ULL)
54 #define NSEC_PER_SEC ((nsec_t) 1000000000ULL)
55 #define NSEC_PER_MSEC ((nsec_t) 1000000ULL)
56 #define NSEC_PER_USEC ((nsec_t) 1000ULL)
58 #define USEC_PER_MINUTE ((usec_t) (60ULL*USEC_PER_SEC))
59 #define NSEC_PER_MINUTE ((nsec_t) (60ULL*NSEC_PER_SEC))
60 #define USEC_PER_HOUR ((usec_t) (60ULL*USEC_PER_MINUTE))
61 #define NSEC_PER_HOUR ((nsec_t) (60ULL*NSEC_PER_MINUTE))
62 #define USEC_PER_DAY ((usec_t) (24ULL*USEC_PER_HOUR))
63 #define NSEC_PER_DAY ((nsec_t) (24ULL*NSEC_PER_HOUR))
64 #define USEC_PER_WEEK ((usec_t) (7ULL*USEC_PER_DAY))
65 #define NSEC_PER_WEEK ((nsec_t) (7ULL*NSEC_PER_DAY))
66 #define USEC_PER_MONTH ((usec_t) (2629800ULL*USEC_PER_SEC))
67 #define NSEC_PER_MONTH ((nsec_t) (2629800ULL*NSEC_PER_SEC))
68 #define USEC_PER_YEAR ((usec_t) (31557600ULL*USEC_PER_SEC))
69 #define NSEC_PER_YEAR ((nsec_t) (31557600ULL*NSEC_PER_SEC))
71 /* We assume a maximum timezone length of 6. TZNAME_MAX is not defined on Linux, but glibc internally initializes this
72 * to 6. Let's rely on that. */
73 #define FORMAT_TIMESTAMP_MAX (3+1+10+1+8+1+6+1+6+1)
74 #define FORMAT_TIMESTAMP_WIDTH 28 /* when outputting, assume this width */
75 #define FORMAT_TIMESTAMP_RELATIVE_MAX 256
76 #define FORMAT_TIMESPAN_MAX 64
78 #define TIME_T_MAX (time_t)((UINTMAX_C(1) << ((sizeof(time_t) << 3) - 1)) - 1)
80 #define DUAL_TIMESTAMP_NULL ((struct dual_timestamp) {})
81 #define TRIPLE_TIMESTAMP_NULL ((struct triple_timestamp) {})
83 usec_t now(clockid_t clock);
84 #if 0 /// UNNEEDED by elogind
85 nsec_t now_nsec(clockid_t clock);
88 dual_timestamp* dual_timestamp_get(dual_timestamp *ts);
89 dual_timestamp* dual_timestamp_from_realtime(dual_timestamp *ts, usec_t u);
90 #if 0 /// UNNEEDED by elogind
91 dual_timestamp* dual_timestamp_from_monotonic(dual_timestamp *ts, usec_t u);
92 dual_timestamp* dual_timestamp_from_boottime_or_monotonic(dual_timestamp *ts, usec_t u);
95 triple_timestamp* triple_timestamp_get(triple_timestamp *ts);
96 triple_timestamp* triple_timestamp_from_realtime(triple_timestamp *ts, usec_t u);
98 #define DUAL_TIMESTAMP_HAS_CLOCK(clock) \
99 IN_SET(clock, CLOCK_REALTIME, CLOCK_REALTIME_ALARM, CLOCK_MONOTONIC)
101 #define TRIPLE_TIMESTAMP_HAS_CLOCK(clock) \
102 IN_SET(clock, CLOCK_REALTIME, CLOCK_REALTIME_ALARM, CLOCK_MONOTONIC, CLOCK_BOOTTIME, CLOCK_BOOTTIME_ALARM)
104 static inline bool dual_timestamp_is_set(dual_timestamp *ts) {
105 return ((ts->realtime > 0 && ts->realtime != USEC_INFINITY) ||
106 (ts->monotonic > 0 && ts->monotonic != USEC_INFINITY));
109 static inline bool triple_timestamp_is_set(triple_timestamp *ts) {
110 return ((ts->realtime > 0 && ts->realtime != USEC_INFINITY) ||
111 (ts->monotonic > 0 && ts->monotonic != USEC_INFINITY) ||
112 (ts->boottime > 0 && ts->boottime != USEC_INFINITY));
115 usec_t triple_timestamp_by_clock(triple_timestamp *ts, clockid_t clock);
117 usec_t timespec_load(const struct timespec *ts) _pure_;
118 struct timespec *timespec_store(struct timespec *ts, usec_t u);
120 usec_t timeval_load(const struct timeval *tv) _pure_;
121 struct timeval *timeval_store(struct timeval *tv, usec_t u);
123 char *format_timestamp(char *buf, size_t l, usec_t t);
124 #if 0 /// UNNEEDED by elogind
125 char *format_timestamp_utc(char *buf, size_t l, usec_t t);
127 char *format_timestamp_us(char *buf, size_t l, usec_t t);
128 #if 0 /// UNNEEDED by elogind
129 char *format_timestamp_us_utc(char *buf, size_t l, usec_t t);
131 char *format_timestamp_relative(char *buf, size_t l, usec_t t);
132 char *format_timespan(char *buf, size_t l, usec_t t, usec_t accuracy);
134 #if 0 /// UNNEEDED by elogind
135 void dual_timestamp_serialize(FILE *f, const char *name, dual_timestamp *t);
136 int dual_timestamp_deserialize(const char *value, dual_timestamp *t);
138 int timestamp_deserialize(const char *value, usec_t *timestamp);
140 #if 0 /// UNNEEDED by elogind
141 int parse_timestamp(const char *t, usec_t *usec);
144 int parse_sec(const char *t, usec_t *usec);
145 int parse_time(const char *t, usec_t *usec, usec_t default_unit);
146 #if 0 /// UNNEEDED by elogind
147 int parse_nsec(const char *t, nsec_t *nsec);
149 bool ntp_synced(void);
151 int get_timezones(char ***l);
152 bool timezone_is_valid(const char *name);
155 bool clock_boottime_supported(void);
156 bool clock_supported(clockid_t clock);
157 #if 0 /// UNNEEDED by elogind
158 clockid_t clock_boottime_or_monotonic(void);
161 #define xstrftime(buf, fmt, tm) \
162 assert_message_se(strftime(buf, ELEMENTSOF(buf), fmt, tm) > 0, \
163 "xstrftime: " #buf "[] must be big enough")
165 #if 0 /// UNNEEDED by elogind
166 int get_timezone(char **timezone);
168 time_t mktime_or_timegm(struct tm *tm, bool utc);
170 struct tm *localtime_or_gmtime_r(const time_t *t, struct tm *tm, bool utc);
172 #if 0 /// UNNEEDED by elogind
173 unsigned long usec_to_jiffies(usec_t usec);
176 static inline usec_t usec_add(usec_t a, usec_t b) {
179 /* Adds two time values, and makes sure USEC_INFINITY as input results as USEC_INFINITY in output, and doesn't
183 if (c < a || c < b) /* overflow check */
184 return USEC_INFINITY;
189 static inline usec_t usec_sub(usec_t timestamp, int64_t delta) {
191 return usec_add(timestamp, (usec_t) (-delta));
193 if (timestamp == USEC_INFINITY) /* Make sure infinity doesn't degrade */
194 return USEC_INFINITY;
196 if (timestamp < (usec_t) delta)
199 return timestamp - delta;