15263807472

/* SPDX-License-Identifier: LGPL-2.1-or-later */
#pragma once

#include <time.h>

#include "forward.h"

#define PRI_NSEC PRIu64
#define PRI_USEC PRIu64
#define NSEC_FMT "%" PRI_NSEC
#define USEC_FMT "%" PRI_USEC

typedef struct dual_timestamp {
        usec_t realtime;
        usec_t monotonic;
} dual_timestamp;

typedef struct triple_timestamp {
        usec_t realtime;
        usec_t monotonic;
        usec_t boottime;
} triple_timestamp;

typedef enum TimestampStyle {
        TIMESTAMP_PRETTY,
        TIMESTAMP_US,
        TIMESTAMP_UTC,
        TIMESTAMP_US_UTC,
        TIMESTAMP_UNIX,
        TIMESTAMP_DATE,
        _TIMESTAMP_STYLE_MAX,
        _TIMESTAMP_STYLE_INVALID = -EINVAL,
} TimestampStyle;

#define USEC_INFINITY ((usec_t) UINT64_MAX)
#define NSEC_INFINITY ((nsec_t) UINT64_MAX)

#define MSEC_PER_SEC  1000ULL
#define USEC_PER_SEC  ((usec_t) 1000000ULL)
#define USEC_PER_MSEC ((usec_t) 1000ULL)
#define NSEC_PER_SEC  ((nsec_t) 1000000000ULL)
#define NSEC_PER_MSEC ((nsec_t) 1000000ULL)
#define NSEC_PER_USEC ((nsec_t) 1000ULL)

#define USEC_PER_MINUTE ((usec_t) (60ULL*USEC_PER_SEC))
#define NSEC_PER_MINUTE ((nsec_t) (60ULL*NSEC_PER_SEC))
#define USEC_PER_HOUR ((usec_t) (60ULL*USEC_PER_MINUTE))
#define NSEC_PER_HOUR ((nsec_t) (60ULL*NSEC_PER_MINUTE))
#define USEC_PER_DAY ((usec_t) (24ULL*USEC_PER_HOUR))
#define NSEC_PER_DAY ((nsec_t) (24ULL*NSEC_PER_HOUR))
#define USEC_PER_WEEK ((usec_t) (7ULL*USEC_PER_DAY))
#define NSEC_PER_WEEK ((nsec_t) (7ULL*NSEC_PER_DAY))
#define USEC_PER_MONTH ((usec_t) (2629800ULL*USEC_PER_SEC))
#define NSEC_PER_MONTH ((nsec_t) (2629800ULL*NSEC_PER_SEC))
#define USEC_PER_YEAR ((usec_t) (31557600ULL*USEC_PER_SEC))
#define NSEC_PER_YEAR ((nsec_t) (31557600ULL*NSEC_PER_SEC))

/* We assume a maximum timezone length of 6. TZNAME_MAX is not defined on Linux, but glibc internally initializes this
 * to 6. Let's rely on that. */
#define FORMAT_TIMESTAMP_MAX (3U+1U+10U+1U+8U+1U+6U+1U+6U+1U)
#define FORMAT_TIMESTAMP_RELATIVE_MAX 256U
#define FORMAT_TIMESPAN_MAX 64U

#define TIME_T_MAX (time_t)((UINTMAX_C(1) << ((sizeof(time_t) << 3) - 1)) - 1)

#define DUAL_TIMESTAMP_NULL ((dual_timestamp) {})
#define DUAL_TIMESTAMP_INFINITY ((dual_timestamp) { USEC_INFINITY, USEC_INFINITY })
#define TRIPLE_TIMESTAMP_NULL ((triple_timestamp) {})

#define TIMESPEC_OMIT ((const struct timespec) { .tv_nsec = UTIME_OMIT })

usec_t now(clockid_t clock);
nsec_t now_nsec(clockid_t clock);

usec_t map_clock_usec_raw(usec_t from, usec_t from_base, usec_t to_base);
usec_t map_clock_usec(usec_t from, clockid_t from_clock, clockid_t to_clock);

dual_timestamp* dual_timestamp_now(dual_timestamp *ts);
dual_timestamp* dual_timestamp_from_realtime(dual_timestamp *ts, usec_t u);
dual_timestamp* dual_timestamp_from_monotonic(dual_timestamp *ts, usec_t u);
dual_timestamp* dual_timestamp_from_boottime(dual_timestamp *ts, usec_t u);

triple_timestamp* triple_timestamp_now(triple_timestamp *ts);
triple_timestamp* triple_timestamp_from_realtime(triple_timestamp *ts, usec_t u);
triple_timestamp* triple_timestamp_from_boottime(triple_timestamp *ts, usec_t u);

#define DUAL_TIMESTAMP_HAS_CLOCK(clock)                               \
        IN_SET(clock, CLOCK_REALTIME, CLOCK_REALTIME_ALARM, CLOCK_MONOTONIC)

#define TRIPLE_TIMESTAMP_HAS_CLOCK(clock)                               \
        IN_SET(clock, CLOCK_REALTIME, CLOCK_REALTIME_ALARM, CLOCK_MONOTONIC, CLOCK_BOOTTIME, CLOCK_BOOTTIME_ALARM)

static inline bool timestamp_is_set(usec_t timestamp) {
        return timestamp > 0 && timestamp != USEC_INFINITY;
}

static inline bool dual_timestamp_is_set(const dual_timestamp *ts) {
        return timestamp_is_set(ts->realtime) ||
               timestamp_is_set(ts->monotonic);
}

static inline bool triple_timestamp_is_set(const triple_timestamp *ts) {
        return timestamp_is_set(ts->realtime) ||
               timestamp_is_set(ts->monotonic) ||
               timestamp_is_set(ts->boottime);
}

usec_t triple_timestamp_by_clock(triple_timestamp *ts, clockid_t clock);

usec_t timespec_load(const struct timespec *ts) _pure_;
nsec_t timespec_load_nsec(const struct timespec *ts) _pure_;
struct timespec* timespec_store(struct timespec *ts, usec_t u);
struct timespec* timespec_store_nsec(struct timespec *ts, nsec_t n);

#define TIMESPEC_STORE(u) timespec_store(&(struct timespec) {}, (u))

usec_t timeval_load(const struct timeval *tv) _pure_;
struct timeval* timeval_store(struct timeval *tv, usec_t u);

#define TIMEVAL_STORE(u) timeval_store(&(struct timeval) {}, (u))

char* format_timestamp_style(char *buf, size_t l, usec_t t, TimestampStyle style) _warn_unused_result_;
char* format_timestamp_relative_full(char *buf, size_t l, usec_t t, clockid_t clock, bool implicit_left) _warn_unused_result_;
char* format_timespan(char *buf, size_t l, usec_t t, usec_t accuracy) _warn_unused_result_;

_warn_unused_result_
static inline char* format_timestamp_relative(char *buf, size_t l, usec_t t) {
        return format_timestamp_relative_full(buf, l, t, CLOCK_REALTIME, /* implicit_left = */ false);
}
_warn_unused_result_
static inline char* format_timestamp_relative_monotonic(char *buf, size_t l, usec_t t) {
        return format_timestamp_relative_full(buf, l, t, CLOCK_MONOTONIC, /* implicit_left = */ false);
}

_warn_unused_result_
static inline char* format_timestamp(char *buf, size_t l, usec_t t) {
        return format_timestamp_style(buf, l, t, TIMESTAMP_PRETTY);
}

/* Note: the lifetime of the compound literal is the immediately surrounding block,
 * see C11 §6.5.2.5, and
 * https://stackoverflow.com/questions/34880638/compound-literal-lifetime-and-if-blocks */
#define FORMAT_TIMESTAMP(t) format_timestamp((char[FORMAT_TIMESTAMP_MAX]){}, FORMAT_TIMESTAMP_MAX, t)
#define FORMAT_TIMESTAMP_RELATIVE(t)                                    \
        format_timestamp_relative((char[FORMAT_TIMESTAMP_RELATIVE_MAX]){}, FORMAT_TIMESTAMP_RELATIVE_MAX, t)
#define FORMAT_TIMESTAMP_RELATIVE_MONOTONIC(t)                          \
        format_timestamp_relative_monotonic((char[FORMAT_TIMESTAMP_RELATIVE_MAX]){}, FORMAT_TIMESTAMP_RELATIVE_MAX, t)
#define FORMAT_TIMESPAN(t, accuracy) format_timespan((char[FORMAT_TIMESPAN_MAX]){}, FORMAT_TIMESPAN_MAX, t, accuracy)
#define FORMAT_TIMESTAMP_STYLE(t, style) \
        format_timestamp_style((char[FORMAT_TIMESTAMP_MAX]){}, FORMAT_TIMESTAMP_MAX, t, style)

int parse_timestamp(const char *t, usec_t *ret);

int parse_sec(const char *t, usec_t *ret);
int parse_sec_fix_0(const char *t, usec_t *ret);
int parse_sec_def_infinity(const char *t, usec_t *ret);
int parse_time(const char *t, usec_t *ret, usec_t default_unit);
int parse_nsec(const char *t, nsec_t *ret);

int get_timezones(char ***ret);
int verify_timezone(const char *name, int log_level);
static inline bool timezone_is_valid(const char *name, int log_level) {
        return verify_timezone(name, log_level) >= 0;
}

bool clock_supported(clockid_t clock);

usec_t usec_shift_clock(usec_t, clockid_t from, clockid_t to);

int get_timezone(char **ret);

int mktime_or_timegm_usec(struct tm *tm, bool utc, usec_t *ret);
int localtime_or_gmtime_usec(usec_t t, bool utc, struct tm *ret);

uint32_t usec_to_jiffies(usec_t usec);
usec_t jiffies_to_usec(uint32_t jiffies);

bool in_utc_timezone(void);

static inline usec_t usec_add(usec_t a, usec_t b) {
        /* Adds two time values, and makes sure USEC_INFINITY as input results as USEC_INFINITY in output,
         * and doesn't overflow. */
        return saturate_add(a, b, USEC_INFINITY);
}

static inline usec_t usec_sub_unsigned(usec_t timestamp, usec_t delta) {
        if (timestamp == USEC_INFINITY) /* Make sure infinity doesn't degrade */
                return USEC_INFINITY;
        if (timestamp < delta)
                return 0;

        return timestamp - delta;
}

static inline usec_t usec_sub_signed(usec_t timestamp, int64_t delta) {
        if (delta == INT64_MIN) { /* prevent overflow */
                assert_cc(-(INT64_MIN + 1) == INT64_MAX);
                assert_cc(USEC_INFINITY > INT64_MAX);
                return usec_add(timestamp, (usec_t) INT64_MAX + 1);
        }
        if (delta < 0)
                return usec_add(timestamp, (usec_t) (-delta));

        return usec_sub_unsigned(timestamp, (usec_t) delta);
}

static inline int usleep_safe(usec_t usec) {
        /* usleep() takes useconds_t that is (typically?) uint32_t. Also, usleep() may only support the
         * range [0, 1000000]. See usleep(3). Let's override usleep() with clock_nanosleep().
         *
         * ⚠️ Note we are not using plain nanosleep() here, since that operates on CLOCK_REALTIME, not
         *    CLOCK_MONOTONIC! */

        if (usec == 0)
                return 0;

        /* `clock_nanosleep()` does not use `errno`, but returns positive error codes. */
        return -clock_nanosleep(CLOCK_MONOTONIC, 0, TIMESPEC_STORE(usec), NULL);
}

/* The last second we can format is 31. Dec 9999, 1s before midnight, because otherwise we'd enter 5 digit
 * year territory. However, since we want to stay away from this in all timezones we take one day off. */
#define USEC_TIMESTAMP_FORMATTABLE_MAX_64BIT ((usec_t) 253402214399000000) /* Thu 9999-12-30 23:59:59 UTC */
/* With a 32-bit time_t we can't go beyond 2038...
 * We parse timestamp with RFC-822/ISO 8601 (e.g. +06, or -03:00) as UTC, hence the upper bound must be off
 * by USEC_PER_DAY. See parse_timestamp() for more details. */
#define USEC_TIMESTAMP_FORMATTABLE_MAX_32BIT (((usec_t) INT32_MAX) * USEC_PER_SEC - USEC_PER_DAY)
#if SIZEOF_TIME_T == 8
#  define USEC_TIMESTAMP_FORMATTABLE_MAX USEC_TIMESTAMP_FORMATTABLE_MAX_64BIT
#elif SIZEOF_TIME_T == 4
#  define USEC_TIMESTAMP_FORMATTABLE_MAX USEC_TIMESTAMP_FORMATTABLE_MAX_32BIT
#else
#  error "Yuck, time_t is neither 4 nor 8 bytes wide?"
#endif

int time_change_fd(void);

const char* timestamp_style_to_string(TimestampStyle t) _const_;
TimestampStyle timestamp_style_from_string(const char *s) _pure_;

1	/* SPDX-License-Identifier: LGPL-2.1-or-later */
2	#pragma once
3
4	#include <time.h>
5
6	#include "forward.h"
7
8	#define PRI_NSEC PRIu64
9	#define PRI_USEC PRIu64
10	#define NSEC_FMT "%" PRI_NSEC
11	#define USEC_FMT "%" PRI_USEC
12
13	typedef struct dual_timestamp {
14	usec_t realtime;
15	usec_t monotonic;
16	} dual_timestamp;
17
18	typedef struct triple_timestamp {
19	usec_t realtime;
20	usec_t monotonic;
21	usec_t boottime;
22	} triple_timestamp;
23
24	typedef enum TimestampStyle {
25	TIMESTAMP_PRETTY,
26	TIMESTAMP_US,
27	TIMESTAMP_UTC,
28	TIMESTAMP_US_UTC,
29	TIMESTAMP_UNIX,
30	TIMESTAMP_DATE,
31	_TIMESTAMP_STYLE_MAX,
32	_TIMESTAMP_STYLE_INVALID = -EINVAL,
33	} TimestampStyle;
34
35	#define USEC_INFINITY ((usec_t) UINT64_MAX)
36	#define NSEC_INFINITY ((nsec_t) UINT64_MAX)
37
38	#define MSEC_PER_SEC 1000ULL
39	#define USEC_PER_SEC ((usec_t) 1000000ULL)
40	#define USEC_PER_MSEC ((usec_t) 1000ULL)
41	#define NSEC_PER_SEC ((nsec_t) 1000000000ULL)
42	#define NSEC_PER_MSEC ((nsec_t) 1000000ULL)
43	#define NSEC_PER_USEC ((nsec_t) 1000ULL)
44
45	#define USEC_PER_MINUTE ((usec_t) (60ULL*USEC_PER_SEC))
46	#define NSEC_PER_MINUTE ((nsec_t) (60ULL*NSEC_PER_SEC))
47	#define USEC_PER_HOUR ((usec_t) (60ULL*USEC_PER_MINUTE))
48	#define NSEC_PER_HOUR ((nsec_t) (60ULL*NSEC_PER_MINUTE))
49	#define USEC_PER_DAY ((usec_t) (24ULL*USEC_PER_HOUR))
50	#define NSEC_PER_DAY ((nsec_t) (24ULL*NSEC_PER_HOUR))
51	#define USEC_PER_WEEK ((usec_t) (7ULL*USEC_PER_DAY))
52	#define NSEC_PER_WEEK ((nsec_t) (7ULL*NSEC_PER_DAY))
53	#define USEC_PER_MONTH ((usec_t) (2629800ULL*USEC_PER_SEC))
54	#define NSEC_PER_MONTH ((nsec_t) (2629800ULL*NSEC_PER_SEC))
55	#define USEC_PER_YEAR ((usec_t) (31557600ULL*USEC_PER_SEC))
56	#define NSEC_PER_YEAR ((nsec_t) (31557600ULL*NSEC_PER_SEC))
57
58	/* We assume a maximum timezone length of 6. TZNAME_MAX is not defined on Linux, but glibc internally initializes this
59	* to 6. Let's rely on that. */
60	#define FORMAT_TIMESTAMP_MAX (3U+1U+10U+1U+8U+1U+6U+1U+6U+1U)
61	#define FORMAT_TIMESTAMP_RELATIVE_MAX 256U
62	#define FORMAT_TIMESPAN_MAX 64U
63
64	#define TIME_T_MAX (time_t)((UINTMAX_C(1) << ((sizeof(time_t) << 3) - 1)) - 1)
65
66	#define DUAL_TIMESTAMP_NULL ((dual_timestamp) {})
67	#define DUAL_TIMESTAMP_INFINITY ((dual_timestamp) { USEC_INFINITY, USEC_INFINITY })
68	#define TRIPLE_TIMESTAMP_NULL ((triple_timestamp) {})
69
70	#define TIMESPEC_OMIT ((const struct timespec) { .tv_nsec = UTIME_OMIT })
71
72	usec_t now(clockid_t clock);
73	nsec_t now_nsec(clockid_t clock);
74
75	usec_t map_clock_usec_raw(usec_t from, usec_t from_base, usec_t to_base);
76	usec_t map_clock_usec(usec_t from, clockid_t from_clock, clockid_t to_clock);
77
78	dual_timestamp* dual_timestamp_now(dual_timestamp *ts);
79	dual_timestamp* dual_timestamp_from_realtime(dual_timestamp *ts, usec_t u);
80	dual_timestamp* dual_timestamp_from_monotonic(dual_timestamp *ts, usec_t u);
81	dual_timestamp* dual_timestamp_from_boottime(dual_timestamp *ts, usec_t u);
82
83	triple_timestamp* triple_timestamp_now(triple_timestamp *ts);
84	triple_timestamp* triple_timestamp_from_realtime(triple_timestamp *ts, usec_t u);
85	triple_timestamp* triple_timestamp_from_boottime(triple_timestamp *ts, usec_t u);
86
87	#define DUAL_TIMESTAMP_HAS_CLOCK(clock) \
88	IN_SET(clock, CLOCK_REALTIME, CLOCK_REALTIME_ALARM, CLOCK_MONOTONIC)
89
90	#define TRIPLE_TIMESTAMP_HAS_CLOCK(clock) \
91	IN_SET(clock, CLOCK_REALTIME, CLOCK_REALTIME_ALARM, CLOCK_MONOTONIC, CLOCK_BOOTTIME, CLOCK_BOOTTIME_ALARM)
92
93	static inline bool timestamp_is_set(usec_t timestamp) {	4,313,021✔
94	return timestamp > 0 && timestamp != USEC_INFINITY;	4,305,110✔
95	}
96
97	static inline bool dual_timestamp_is_set(const dual_timestamp *ts) {	535,950✔
98	return timestamp_is_set(ts->realtime) \|\|	535,940✔
99	timestamp_is_set(ts->monotonic);	401,438✔
100	}
101
102	static inline bool triple_timestamp_is_set(const triple_timestamp *ts) {	3,143,173✔
103	return timestamp_is_set(ts->realtime) \|\|	3,145,272✔
104	timestamp_is_set(ts->monotonic) \|\|	3,143,173✔
105	timestamp_is_set(ts->boottime);	2,099✔
106	}
107
108	usec_t triple_timestamp_by_clock(triple_timestamp *ts, clockid_t clock);
109
110	usec_t timespec_load(const struct timespec *ts) _pure_;
111	nsec_t timespec_load_nsec(const struct timespec *ts) _pure_;
112	struct timespec* timespec_store(struct timespec *ts, usec_t u);
113	struct timespec* timespec_store_nsec(struct timespec *ts, nsec_t n);
114
115	#define TIMESPEC_STORE(u) timespec_store(&(struct timespec) {}, (u))
116
117	usec_t timeval_load(const struct timeval *tv) _pure_;
118	struct timeval* timeval_store(struct timeval *tv, usec_t u);
119
120	#define TIMEVAL_STORE(u) timeval_store(&(struct timeval) {}, (u))
121
122	char* format_timestamp_style(char *buf, size_t l, usec_t t, TimestampStyle style) _warn_unused_result_;
123	char* format_timestamp_relative_full(char *buf, size_t l, usec_t t, clockid_t clock, bool implicit_left) _warn_unused_result_;
124	char* format_timespan(char *buf, size_t l, usec_t t, usec_t accuracy) _warn_unused_result_;
125
126	_warn_unused_result_
127	static inline char* format_timestamp_relative(char *buf, size_t l, usec_t t) {	680✔
128	return format_timestamp_relative_full(buf, l, t, CLOCK_REALTIME, /* implicit_left = */ false);	680✔
129	}
130	_warn_unused_result_
131	static inline char* format_timestamp_relative_monotonic(char *buf, size_t l, usec_t t) {	6✔
132	return format_timestamp_relative_full(buf, l, t, CLOCK_MONOTONIC, /* implicit_left = */ false);	6✔
133	}
134
135	_warn_unused_result_
136	static inline char* format_timestamp(char *buf, size_t l, usec_t t) {	4,389✔
137	return format_timestamp_style(buf, l, t, TIMESTAMP_PRETTY);	4,382✔
138	}
139
140	/* Note: the lifetime of the compound literal is the immediately surrounding block,
141	* see C11 §6.5.2.5, and
142	* https://stackoverflow.com/questions/34880638/compound-literal-lifetime-and-if-blocks */
143	#define FORMAT_TIMESTAMP(t) format_timestamp((char[FORMAT_TIMESTAMP_MAX]){}, FORMAT_TIMESTAMP_MAX, t)
144	#define FORMAT_TIMESTAMP_RELATIVE(t) \
145	format_timestamp_relative((char[FORMAT_TIMESTAMP_RELATIVE_MAX]){}, FORMAT_TIMESTAMP_RELATIVE_MAX, t)
146	#define FORMAT_TIMESTAMP_RELATIVE_MONOTONIC(t) \
147	format_timestamp_relative_monotonic((char[FORMAT_TIMESTAMP_RELATIVE_MAX]){}, FORMAT_TIMESTAMP_RELATIVE_MAX, t)
148	#define FORMAT_TIMESPAN(t, accuracy) format_timespan((char[FORMAT_TIMESPAN_MAX]){}, FORMAT_TIMESPAN_MAX, t, accuracy)
149	#define FORMAT_TIMESTAMP_STYLE(t, style) \
150	format_timestamp_style((char[FORMAT_TIMESTAMP_MAX]){}, FORMAT_TIMESTAMP_MAX, t, style)
151
152	int parse_timestamp(const char t, usec_t ret);
153
154	int parse_sec(const char t, usec_t ret);
155	int parse_sec_fix_0(const char t, usec_t ret);
156	int parse_sec_def_infinity(const char t, usec_t ret);
157	int parse_time(const char t, usec_t ret, usec_t default_unit);
158	int parse_nsec(const char t, nsec_t ret);
159
160	int get_timezones(char ***ret);
161	int verify_timezone(const char *name, int log_level);
162	static inline bool timezone_is_valid(const char *name, int log_level) {	1,197✔
163	return verify_timezone(name, log_level) >= 0;	1,197✔
164	}
165
166	bool clock_supported(clockid_t clock);
167
168	usec_t usec_shift_clock(usec_t, clockid_t from, clockid_t to);
169
170	int get_timezone(char **ret);
171
172	int mktime_or_timegm_usec(struct tm tm, bool utc, usec_t ret);
173	int localtime_or_gmtime_usec(usec_t t, bool utc, struct tm *ret);
174
175	uint32_t usec_to_jiffies(usec_t usec);
176	usec_t jiffies_to_usec(uint32_t jiffies);
177
178	bool in_utc_timezone(void);
179
180	static inline usec_t usec_add(usec_t a, usec_t b) {	11,102,011✔
181	/* Adds two time values, and makes sure USEC_INFINITY as input results as USEC_INFINITY in output,
182	* and doesn't overflow. */
183	return saturate_add(a, b, USEC_INFINITY);	11,102,969✔
184	}
185
186	static inline usec_t usec_sub_unsigned(usec_t timestamp, usec_t delta) {	361,086✔
187	if (timestamp == USEC_INFINITY) /* Make sure infinity doesn't degrade */	344,828✔
188	return USEC_INFINITY;
189	if (timestamp < delta)	342,168✔
190	return 0;
191
192	return timestamp - delta;	355,554✔
193	}
194
195	static inline usec_t usec_sub_signed(usec_t timestamp, int64_t delta) {	313✔
196	if (delta == INT64_MIN) { /* prevent overflow */	313✔
UNCOV 197	assert_cc(-(INT64_MIN + 1) == INT64_MAX);	×
UNCOV 198	assert_cc(USEC_INFINITY > INT64_MAX);	×
199	return usec_add(timestamp, (usec_t) INT64_MAX + 1);	1✔
200	}
201	if (delta < 0)	313✔
202	return usec_add(timestamp, (usec_t) (-delta));	301✔
203
204	return usec_sub_unsigned(timestamp, (usec_t) delta);	164✔
205	}
206
207	static inline int usleep_safe(usec_t usec) {	329✔
208	/* usleep() takes useconds_t that is (typically?) uint32_t. Also, usleep() may only support the
209	* range [0, 1000000]. See usleep(3). Let's override usleep() with clock_nanosleep().
210	*
211	* ⚠️ Note we are not using plain nanosleep() here, since that operates on CLOCK_REALTIME, not
212	* CLOCK_MONOTONIC! */
213
214	if (usec == 0)	329✔
215	return 0;	329✔
216
217	/* `clock_nanosleep()` does not use `errno`, but returns positive error codes. */
218	return -clock_nanosleep(CLOCK_MONOTONIC, 0, TIMESPEC_STORE(usec), NULL);	328✔
219	}
220
221	/* The last second we can format is 31. Dec 9999, 1s before midnight, because otherwise we'd enter 5 digit
222	* year territory. However, since we want to stay away from this in all timezones we take one day off. */
223	#define USEC_TIMESTAMP_FORMATTABLE_MAX_64BIT ((usec_t) 253402214399000000) /* Thu 9999-12-30 23:59:59 UTC */
224	/* With a 32-bit time_t we can't go beyond 2038...
225	* We parse timestamp with RFC-822/ISO 8601 (e.g. +06, or -03:00) as UTC, hence the upper bound must be off
226	* by USEC_PER_DAY. See parse_timestamp() for more details. */
227	#define USEC_TIMESTAMP_FORMATTABLE_MAX_32BIT (((usec_t) INT32_MAX) * USEC_PER_SEC - USEC_PER_DAY)
228	#if SIZEOF_TIME_T == 8
229	# define USEC_TIMESTAMP_FORMATTABLE_MAX USEC_TIMESTAMP_FORMATTABLE_MAX_64BIT
230	#elif SIZEOF_TIME_T == 4
231	# define USEC_TIMESTAMP_FORMATTABLE_MAX USEC_TIMESTAMP_FORMATTABLE_MAX_32BIT
232	#else
233	# error "Yuck, time_t is neither 4 nor 8 bytes wide?"
234	#endif
235
236	int time_change_fd(void);
237
238	const char* timestamp_style_to_string(TimestampStyle t) _const_;
239	TimestampStyle timestamp_style_from_string(const char *s) _pure_;

systemd / systemd / 15263807472

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