/* SPDX-License-Identifier: LGPL-2.1-or-later */ #pragma once #include #include #include #include #include #include typedef uint64_t usec_t; typedef uint64_t nsec_t; #define PRI_NSEC PRIu64 #define PRI_USEC PRIu64 #define NSEC_FMT "%" PRI_NSEC #define USEC_FMT "%" PRI_USEC #include "macro.h" 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 ((struct dual_timestamp) {}) #define TRIPLE_TIMESTAMP_NULL ((struct triple_timestamp) {}) usec_t now(clockid_t clock); nsec_t now_nsec(clockid_t clock); 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); time_t mktime_or_timegm(struct tm *tm, bool utc); struct tm *localtime_or_gmtime_r(const time_t *t, struct tm *tm, bool utc); 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. */ if (a > USEC_INFINITY - b) /* overflow check */ return USEC_INFINITY; return a + b; } 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! */ // FIXME: use RET_NERRNO() macro here. Currently, this header cannot include errno-util.h. return clock_nanosleep(CLOCK_MONOTONIC, 0, TIMESPEC_STORE(usec), NULL) < 0 ? -errno : 0; } /* 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_;