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git.ipfire.org Git - thirdparty/systemd.git/blob - src/basic/time-util.h
1 /* SPDX-License-Identifier: LGPL-2.1+ */
11 typedef uint64_t usec_t
;
12 typedef uint64_t nsec_t
;
14 #define PRI_NSEC PRIu64
15 #define PRI_USEC PRIu64
16 #define NSEC_FMT "%" PRI_NSEC
17 #define USEC_FMT "%" PRI_USEC
21 typedef struct dual_timestamp
{
26 typedef struct triple_timestamp
{
32 #define USEC_INFINITY ((usec_t) -1)
33 #define NSEC_INFINITY ((nsec_t) -1)
35 #define MSEC_PER_SEC 1000ULL
36 #define USEC_PER_SEC ((usec_t) 1000000ULL)
37 #define USEC_PER_MSEC ((usec_t) 1000ULL)
38 #define NSEC_PER_SEC ((nsec_t) 1000000000ULL)
39 #define NSEC_PER_MSEC ((nsec_t) 1000000ULL)
40 #define NSEC_PER_USEC ((nsec_t) 1000ULL)
42 #define USEC_PER_MINUTE ((usec_t) (60ULL*USEC_PER_SEC))
43 #define NSEC_PER_MINUTE ((nsec_t) (60ULL*NSEC_PER_SEC))
44 #define USEC_PER_HOUR ((usec_t) (60ULL*USEC_PER_MINUTE))
45 #define NSEC_PER_HOUR ((nsec_t) (60ULL*NSEC_PER_MINUTE))
46 #define USEC_PER_DAY ((usec_t) (24ULL*USEC_PER_HOUR))
47 #define NSEC_PER_DAY ((nsec_t) (24ULL*NSEC_PER_HOUR))
48 #define USEC_PER_WEEK ((usec_t) (7ULL*USEC_PER_DAY))
49 #define NSEC_PER_WEEK ((nsec_t) (7ULL*NSEC_PER_DAY))
50 #define USEC_PER_MONTH ((usec_t) (2629800ULL*USEC_PER_SEC))
51 #define NSEC_PER_MONTH ((nsec_t) (2629800ULL*NSEC_PER_SEC))
52 #define USEC_PER_YEAR ((usec_t) (31557600ULL*USEC_PER_SEC))
53 #define NSEC_PER_YEAR ((nsec_t) (31557600ULL*NSEC_PER_SEC))
55 /* We assume a maximum timezone length of 6. TZNAME_MAX is not defined on Linux, but glibc internally initializes this
56 * to 6. Let's rely on that. */
57 #define FORMAT_TIMESTAMP_MAX (3+1+10+1+8+1+6+1+6+1)
58 #define FORMAT_TIMESTAMP_WIDTH 28 /* when outputting, assume this width */
59 #define FORMAT_TIMESTAMP_RELATIVE_MAX 256
60 #define FORMAT_TIMESPAN_MAX 64
62 #define TIME_T_MAX (time_t)((UINTMAX_C(1) << ((sizeof(time_t) << 3) - 1)) - 1)
64 #define DUAL_TIMESTAMP_NULL ((struct dual_timestamp) {})
65 #define TRIPLE_TIMESTAMP_NULL ((struct triple_timestamp) {})
67 usec_t
now(clockid_t clock
);
68 nsec_t
now_nsec(clockid_t clock
);
70 dual_timestamp
* dual_timestamp_get(dual_timestamp
*ts
);
71 dual_timestamp
* dual_timestamp_from_realtime(dual_timestamp
*ts
, usec_t u
);
72 dual_timestamp
* dual_timestamp_from_monotonic(dual_timestamp
*ts
, usec_t u
);
73 dual_timestamp
* dual_timestamp_from_boottime_or_monotonic(dual_timestamp
*ts
, usec_t u
);
75 triple_timestamp
* triple_timestamp_get(triple_timestamp
*ts
);
76 triple_timestamp
* triple_timestamp_from_realtime(triple_timestamp
*ts
, usec_t u
);
78 #define DUAL_TIMESTAMP_HAS_CLOCK(clock) \
79 IN_SET(clock, CLOCK_REALTIME, CLOCK_REALTIME_ALARM, CLOCK_MONOTONIC)
81 #define TRIPLE_TIMESTAMP_HAS_CLOCK(clock) \
82 IN_SET(clock, CLOCK_REALTIME, CLOCK_REALTIME_ALARM, CLOCK_MONOTONIC, CLOCK_BOOTTIME, CLOCK_BOOTTIME_ALARM)
84 static inline bool dual_timestamp_is_set(const dual_timestamp
*ts
) {
85 return ((ts
->realtime
> 0 && ts
->realtime
!= USEC_INFINITY
) ||
86 (ts
->monotonic
> 0 && ts
->monotonic
!= USEC_INFINITY
));
89 static inline bool triple_timestamp_is_set(const triple_timestamp
*ts
) {
90 return ((ts
->realtime
> 0 && ts
->realtime
!= USEC_INFINITY
) ||
91 (ts
->monotonic
> 0 && ts
->monotonic
!= USEC_INFINITY
) ||
92 (ts
->boottime
> 0 && ts
->boottime
!= USEC_INFINITY
));
95 usec_t
triple_timestamp_by_clock(triple_timestamp
*ts
, clockid_t clock
);
97 usec_t
timespec_load(const struct timespec
*ts
) _pure_
;
98 nsec_t
timespec_load_nsec(const struct timespec
*ts
) _pure_
;
99 struct timespec
*timespec_store(struct timespec
*ts
, usec_t u
);
101 usec_t
timeval_load(const struct timeval
*tv
) _pure_
;
102 struct timeval
*timeval_store(struct timeval
*tv
, usec_t u
);
104 char *format_timestamp(char *buf
, size_t l
, usec_t t
);
105 char *format_timestamp_utc(char *buf
, size_t l
, usec_t t
);
106 char *format_timestamp_us(char *buf
, size_t l
, usec_t t
);
107 char *format_timestamp_us_utc(char *buf
, size_t l
, usec_t t
);
108 char *format_timestamp_relative(char *buf
, size_t l
, usec_t t
);
109 char *format_timespan(char *buf
, size_t l
, usec_t t
, usec_t accuracy
);
111 int parse_timestamp(const char *t
, usec_t
*usec
);
113 int parse_sec(const char *t
, usec_t
*usec
);
114 int parse_sec_fix_0(const char *t
, usec_t
*usec
);
115 int parse_sec_def_infinity(const char *t
, usec_t
*usec
);
116 int parse_time(const char *t
, usec_t
*usec
, usec_t default_unit
);
117 int parse_nsec(const char *t
, nsec_t
*nsec
);
119 bool ntp_synced(void);
121 int get_timezones(char ***l
);
122 bool timezone_is_valid(const char *name
, int log_level
);
124 bool clock_boottime_supported(void);
125 bool clock_supported(clockid_t clock
);
126 clockid_t
clock_boottime_or_monotonic(void);
128 usec_t
usec_shift_clock(usec_t
, clockid_t from
, clockid_t to
);
130 int get_timezone(char **timezone
);
132 time_t mktime_or_timegm(struct tm
*tm
, bool utc
);
133 struct tm
*localtime_or_gmtime_r(const time_t *t
, struct tm
*tm
, bool utc
);
135 unsigned long usec_to_jiffies(usec_t usec
);
137 bool in_utc_timezone(void);
139 static inline usec_t
usec_add(usec_t a
, usec_t b
) {
142 /* Adds two time values, and makes sure USEC_INFINITY as input results as USEC_INFINITY in output, and doesn't
146 if (c
< a
|| c
< b
) /* overflow check */
147 return USEC_INFINITY
;
152 static inline usec_t
usec_sub_unsigned(usec_t timestamp
, usec_t delta
) {
154 if (timestamp
== USEC_INFINITY
) /* Make sure infinity doesn't degrade */
155 return USEC_INFINITY
;
156 if (timestamp
< delta
)
159 return timestamp
- delta
;
162 static inline usec_t
usec_sub_signed(usec_t timestamp
, int64_t delta
) {
164 return usec_add(timestamp
, (usec_t
) (-delta
));
166 return usec_sub_unsigned(timestamp
, (usec_t
) delta
);
169 #if SIZEOF_TIME_T == 8
170 /* The last second we can format is 31. Dec 9999, 1s before midnight, because otherwise we'd enter 5 digit year
171 * territory. However, since we want to stay away from this in all timezones we take one day off. */
172 #define USEC_TIMESTAMP_FORMATTABLE_MAX ((usec_t) 253402214399000000)
173 #elif SIZEOF_TIME_T == 4
174 /* With a 32bit time_t we can't go beyond 2038... */
175 #define USEC_TIMESTAMP_FORMATTABLE_MAX ((usec_t) 2147483647000000)
177 #error "Yuck, time_t is neither 4 nor 8 bytes wide?"
180 int time_change_fd(void);