Line data Source code
1 : /* SPDX-License-Identifier: LGPL-2.1+ */
2 : #pragma once
3 :
4 : #include <inttypes.h>
5 : #include <stdbool.h>
6 : #include <stddef.h>
7 : #include <stdint.h>
8 : #include <stdio.h>
9 : #include <time.h>
10 :
11 : typedef uint64_t usec_t;
12 : typedef uint64_t nsec_t;
13 :
14 : #define PRI_NSEC PRIu64
15 : #define PRI_USEC PRIu64
16 : #define NSEC_FMT "%" PRI_NSEC
17 : #define USEC_FMT "%" PRI_USEC
18 :
19 : #include "macro.h"
20 :
21 : typedef struct dual_timestamp {
22 : usec_t realtime;
23 : usec_t monotonic;
24 : } dual_timestamp;
25 :
26 : typedef struct triple_timestamp {
27 : usec_t realtime;
28 : usec_t monotonic;
29 : usec_t boottime;
30 : } triple_timestamp;
31 :
32 : #define USEC_INFINITY ((usec_t) -1)
33 : #define NSEC_INFINITY ((nsec_t) -1)
34 :
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)
41 :
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))
54 :
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
61 :
62 : #define TIME_T_MAX (time_t)((UINTMAX_C(1) << ((sizeof(time_t) << 3) - 1)) - 1)
63 :
64 : #define DUAL_TIMESTAMP_NULL ((struct dual_timestamp) {})
65 : #define TRIPLE_TIMESTAMP_NULL ((struct triple_timestamp) {})
66 :
67 : usec_t now(clockid_t clock);
68 : nsec_t now_nsec(clockid_t clock);
69 :
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);
74 :
75 : triple_timestamp* triple_timestamp_get(triple_timestamp *ts);
76 : triple_timestamp* triple_timestamp_from_realtime(triple_timestamp *ts, usec_t u);
77 :
78 : #define DUAL_TIMESTAMP_HAS_CLOCK(clock) \
79 : IN_SET(clock, CLOCK_REALTIME, CLOCK_REALTIME_ALARM, CLOCK_MONOTONIC)
80 :
81 : #define TRIPLE_TIMESTAMP_HAS_CLOCK(clock) \
82 : IN_SET(clock, CLOCK_REALTIME, CLOCK_REALTIME_ALARM, CLOCK_MONOTONIC, CLOCK_BOOTTIME, CLOCK_BOOTTIME_ALARM)
83 :
84 5036 : static inline bool timestamp_is_set(usec_t timestamp) {
85 5036 : return timestamp > 0 && timestamp != USEC_INFINITY;
86 : }
87 :
88 2491 : static inline bool dual_timestamp_is_set(const dual_timestamp *ts) {
89 4950 : return timestamp_is_set(ts->realtime) ||
90 2459 : timestamp_is_set(ts->monotonic);
91 : }
92 :
93 64 : static inline bool triple_timestamp_is_set(const triple_timestamp *ts) {
94 75 : return timestamp_is_set(ts->realtime) ||
95 75 : timestamp_is_set(ts->monotonic) ||
96 11 : timestamp_is_set(ts->boottime);
97 : }
98 :
99 : usec_t triple_timestamp_by_clock(triple_timestamp *ts, clockid_t clock);
100 :
101 : usec_t timespec_load(const struct timespec *ts) _pure_;
102 : nsec_t timespec_load_nsec(const struct timespec *ts) _pure_;
103 : struct timespec *timespec_store(struct timespec *ts, usec_t u);
104 :
105 : usec_t timeval_load(const struct timeval *tv) _pure_;
106 : struct timeval *timeval_store(struct timeval *tv, usec_t u);
107 :
108 : char *format_timestamp(char *buf, size_t l, usec_t t);
109 : char *format_timestamp_utc(char *buf, size_t l, usec_t t);
110 : char *format_timestamp_us(char *buf, size_t l, usec_t t);
111 : char *format_timestamp_us_utc(char *buf, size_t l, usec_t t);
112 : char *format_timestamp_relative(char *buf, size_t l, usec_t t);
113 : char *format_timespan(char *buf, size_t l, usec_t t, usec_t accuracy);
114 :
115 : int parse_timestamp(const char *t, usec_t *usec);
116 :
117 : int parse_sec(const char *t, usec_t *usec);
118 : int parse_sec_fix_0(const char *t, usec_t *usec);
119 : int parse_sec_def_infinity(const char *t, usec_t *usec);
120 : int parse_time(const char *t, usec_t *usec, usec_t default_unit);
121 : int parse_nsec(const char *t, nsec_t *nsec);
122 :
123 : bool ntp_synced(void);
124 :
125 : int get_timezones(char ***l);
126 : bool timezone_is_valid(const char *name, int log_level);
127 :
128 : bool clock_boottime_supported(void);
129 : bool clock_supported(clockid_t clock);
130 : clockid_t clock_boottime_or_monotonic(void);
131 :
132 : usec_t usec_shift_clock(usec_t, clockid_t from, clockid_t to);
133 :
134 : int get_timezone(char **timezone);
135 :
136 : time_t mktime_or_timegm(struct tm *tm, bool utc);
137 : struct tm *localtime_or_gmtime_r(const time_t *t, struct tm *tm, bool utc);
138 :
139 : uint32_t usec_to_jiffies(usec_t usec);
140 : usec_t jiffies_to_usec(uint32_t jiffies);
141 :
142 : bool in_utc_timezone(void);
143 :
144 9670 : static inline usec_t usec_add(usec_t a, usec_t b) {
145 : usec_t c;
146 :
147 : /* Adds two time values, and makes sure USEC_INFINITY as input results as USEC_INFINITY in output, and doesn't
148 : * overflow. */
149 :
150 9670 : c = a + b;
151 9670 : if (c < a || c < b) /* overflow check */
152 12 : return USEC_INFINITY;
153 :
154 9658 : return c;
155 : }
156 :
157 73 : static inline usec_t usec_sub_unsigned(usec_t timestamp, usec_t delta) {
158 :
159 73 : if (timestamp == USEC_INFINITY) /* Make sure infinity doesn't degrade */
160 5 : return USEC_INFINITY;
161 68 : if (timestamp < delta)
162 7 : return 0;
163 :
164 61 : return timestamp - delta;
165 : }
166 :
167 9 : static inline usec_t usec_sub_signed(usec_t timestamp, int64_t delta) {
168 9 : if (delta < 0)
169 3 : return usec_add(timestamp, (usec_t) (-delta));
170 : else
171 6 : return usec_sub_unsigned(timestamp, (usec_t) delta);
172 : }
173 :
174 : #if SIZEOF_TIME_T == 8
175 : /* The last second we can format is 31. Dec 9999, 1s before midnight, because otherwise we'd enter 5 digit year
176 : * territory. However, since we want to stay away from this in all timezones we take one day off. */
177 : #define USEC_TIMESTAMP_FORMATTABLE_MAX ((usec_t) 253402214399000000)
178 : #elif SIZEOF_TIME_T == 4
179 : /* With a 32bit time_t we can't go beyond 2038... */
180 : #define USEC_TIMESTAMP_FORMATTABLE_MAX ((usec_t) 2147483647000000)
181 : #else
182 : #error "Yuck, time_t is neither 4 nor 8 bytes wide?"
183 : #endif
184 :
185 : int time_change_fd(void);
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