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https://github.com/morgan9e/systemd
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252 lines
10 KiB
C
252 lines
10 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#pragma once
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#include <inttypes.h>
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <time.h>
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typedef uint64_t usec_t;
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typedef uint64_t nsec_t;
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#define PRI_NSEC PRIu64
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#define PRI_USEC PRIu64
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#define NSEC_FMT "%" PRI_NSEC
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#define USEC_FMT "%" PRI_USEC
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#include "macro.h"
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typedef struct dual_timestamp {
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usec_t realtime;
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usec_t monotonic;
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} dual_timestamp;
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typedef struct triple_timestamp {
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usec_t realtime;
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usec_t monotonic;
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usec_t boottime;
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} triple_timestamp;
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typedef enum TimestampStyle {
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TIMESTAMP_PRETTY,
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TIMESTAMP_US,
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TIMESTAMP_UTC,
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TIMESTAMP_US_UTC,
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TIMESTAMP_UNIX,
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TIMESTAMP_DATE,
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_TIMESTAMP_STYLE_MAX,
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_TIMESTAMP_STYLE_INVALID = -EINVAL,
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} TimestampStyle;
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#define USEC_INFINITY ((usec_t) UINT64_MAX)
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#define NSEC_INFINITY ((nsec_t) UINT64_MAX)
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#define MSEC_PER_SEC 1000ULL
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#define USEC_PER_SEC ((usec_t) 1000000ULL)
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#define USEC_PER_MSEC ((usec_t) 1000ULL)
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#define NSEC_PER_SEC ((nsec_t) 1000000000ULL)
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#define NSEC_PER_MSEC ((nsec_t) 1000000ULL)
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#define NSEC_PER_USEC ((nsec_t) 1000ULL)
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#define USEC_PER_MINUTE ((usec_t) (60ULL*USEC_PER_SEC))
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#define NSEC_PER_MINUTE ((nsec_t) (60ULL*NSEC_PER_SEC))
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#define USEC_PER_HOUR ((usec_t) (60ULL*USEC_PER_MINUTE))
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#define NSEC_PER_HOUR ((nsec_t) (60ULL*NSEC_PER_MINUTE))
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#define USEC_PER_DAY ((usec_t) (24ULL*USEC_PER_HOUR))
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#define NSEC_PER_DAY ((nsec_t) (24ULL*NSEC_PER_HOUR))
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#define USEC_PER_WEEK ((usec_t) (7ULL*USEC_PER_DAY))
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#define NSEC_PER_WEEK ((nsec_t) (7ULL*NSEC_PER_DAY))
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#define USEC_PER_MONTH ((usec_t) (2629800ULL*USEC_PER_SEC))
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#define NSEC_PER_MONTH ((nsec_t) (2629800ULL*NSEC_PER_SEC))
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#define USEC_PER_YEAR ((usec_t) (31557600ULL*USEC_PER_SEC))
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#define NSEC_PER_YEAR ((nsec_t) (31557600ULL*NSEC_PER_SEC))
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/* We assume a maximum timezone length of 6. TZNAME_MAX is not defined on Linux, but glibc internally initializes this
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* to 6. Let's rely on that. */
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#define FORMAT_TIMESTAMP_MAX (3U+1U+10U+1U+8U+1U+6U+1U+6U+1U)
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#define FORMAT_TIMESTAMP_RELATIVE_MAX 256U
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#define FORMAT_TIMESPAN_MAX 64U
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#define TIME_T_MAX (time_t)((UINTMAX_C(1) << ((sizeof(time_t) << 3) - 1)) - 1)
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#define DUAL_TIMESTAMP_NULL ((dual_timestamp) {})
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#define DUAL_TIMESTAMP_INFINITY ((dual_timestamp) { USEC_INFINITY, USEC_INFINITY })
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#define TRIPLE_TIMESTAMP_NULL ((triple_timestamp) {})
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#define TIMESPEC_OMIT ((const struct timespec) { .tv_nsec = UTIME_OMIT })
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usec_t now(clockid_t clock);
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nsec_t now_nsec(clockid_t clock);
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usec_t map_clock_usec_raw(usec_t from, usec_t from_base, usec_t to_base);
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usec_t map_clock_usec(usec_t from, clockid_t from_clock, clockid_t to_clock);
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dual_timestamp* dual_timestamp_now(dual_timestamp *ts);
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dual_timestamp* dual_timestamp_from_realtime(dual_timestamp *ts, usec_t u);
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dual_timestamp* dual_timestamp_from_monotonic(dual_timestamp *ts, usec_t u);
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dual_timestamp* dual_timestamp_from_boottime(dual_timestamp *ts, usec_t u);
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triple_timestamp* triple_timestamp_now(triple_timestamp *ts);
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triple_timestamp* triple_timestamp_from_realtime(triple_timestamp *ts, usec_t u);
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triple_timestamp* triple_timestamp_from_boottime(triple_timestamp *ts, usec_t u);
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#define DUAL_TIMESTAMP_HAS_CLOCK(clock) \
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IN_SET(clock, CLOCK_REALTIME, CLOCK_REALTIME_ALARM, CLOCK_MONOTONIC)
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#define TRIPLE_TIMESTAMP_HAS_CLOCK(clock) \
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IN_SET(clock, CLOCK_REALTIME, CLOCK_REALTIME_ALARM, CLOCK_MONOTONIC, CLOCK_BOOTTIME, CLOCK_BOOTTIME_ALARM)
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static inline bool timestamp_is_set(usec_t timestamp) {
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return timestamp > 0 && timestamp != USEC_INFINITY;
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}
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static inline bool dual_timestamp_is_set(const dual_timestamp *ts) {
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return timestamp_is_set(ts->realtime) ||
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timestamp_is_set(ts->monotonic);
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}
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static inline bool triple_timestamp_is_set(const triple_timestamp *ts) {
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return timestamp_is_set(ts->realtime) ||
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timestamp_is_set(ts->monotonic) ||
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timestamp_is_set(ts->boottime);
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}
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usec_t triple_timestamp_by_clock(triple_timestamp *ts, clockid_t clock);
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usec_t timespec_load(const struct timespec *ts) _pure_;
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nsec_t timespec_load_nsec(const struct timespec *ts) _pure_;
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struct timespec* timespec_store(struct timespec *ts, usec_t u);
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struct timespec* timespec_store_nsec(struct timespec *ts, nsec_t n);
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#define TIMESPEC_STORE(u) timespec_store(&(struct timespec) {}, (u))
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usec_t timeval_load(const struct timeval *tv) _pure_;
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struct timeval* timeval_store(struct timeval *tv, usec_t u);
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#define TIMEVAL_STORE(u) timeval_store(&(struct timeval) {}, (u))
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char* format_timestamp_style(char *buf, size_t l, usec_t t, TimestampStyle style) _warn_unused_result_;
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char* format_timestamp_relative_full(char *buf, size_t l, usec_t t, clockid_t clock, bool implicit_left) _warn_unused_result_;
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char* format_timespan(char *buf, size_t l, usec_t t, usec_t accuracy) _warn_unused_result_;
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_warn_unused_result_
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static inline char* format_timestamp_relative(char *buf, size_t l, usec_t t) {
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return format_timestamp_relative_full(buf, l, t, CLOCK_REALTIME, /* implicit_left = */ false);
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}
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_warn_unused_result_
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static inline char* format_timestamp_relative_monotonic(char *buf, size_t l, usec_t t) {
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return format_timestamp_relative_full(buf, l, t, CLOCK_MONOTONIC, /* implicit_left = */ false);
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}
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_warn_unused_result_
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static inline char* format_timestamp(char *buf, size_t l, usec_t t) {
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return format_timestamp_style(buf, l, t, TIMESTAMP_PRETTY);
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}
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/* Note: the lifetime of the compound literal is the immediately surrounding block,
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* see C11 §6.5.2.5, and
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* https://stackoverflow.com/questions/34880638/compound-literal-lifetime-and-if-blocks */
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#define FORMAT_TIMESTAMP(t) format_timestamp((char[FORMAT_TIMESTAMP_MAX]){}, FORMAT_TIMESTAMP_MAX, t)
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#define FORMAT_TIMESTAMP_RELATIVE(t) \
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format_timestamp_relative((char[FORMAT_TIMESTAMP_RELATIVE_MAX]){}, FORMAT_TIMESTAMP_RELATIVE_MAX, t)
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#define FORMAT_TIMESTAMP_RELATIVE_MONOTONIC(t) \
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format_timestamp_relative_monotonic((char[FORMAT_TIMESTAMP_RELATIVE_MAX]){}, FORMAT_TIMESTAMP_RELATIVE_MAX, t)
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#define FORMAT_TIMESPAN(t, accuracy) format_timespan((char[FORMAT_TIMESPAN_MAX]){}, FORMAT_TIMESPAN_MAX, t, accuracy)
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#define FORMAT_TIMESTAMP_STYLE(t, style) \
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format_timestamp_style((char[FORMAT_TIMESTAMP_MAX]){}, FORMAT_TIMESTAMP_MAX, t, style)
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int parse_timestamp(const char *t, usec_t *ret);
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int parse_sec(const char *t, usec_t *ret);
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int parse_sec_fix_0(const char *t, usec_t *ret);
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int parse_sec_def_infinity(const char *t, usec_t *ret);
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int parse_time(const char *t, usec_t *ret, usec_t default_unit);
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int parse_nsec(const char *t, nsec_t *ret);
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int get_timezones(char ***ret);
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int verify_timezone(const char *name, int log_level);
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static inline bool timezone_is_valid(const char *name, int log_level) {
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return verify_timezone(name, log_level) >= 0;
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}
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bool clock_supported(clockid_t clock);
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usec_t usec_shift_clock(usec_t, clockid_t from, clockid_t to);
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int get_timezone(char **ret);
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time_t mktime_or_timegm(struct tm *tm, bool utc);
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struct tm *localtime_or_gmtime_r(const time_t *t, struct tm *tm, bool utc);
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uint32_t usec_to_jiffies(usec_t usec);
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usec_t jiffies_to_usec(uint32_t jiffies);
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bool in_utc_timezone(void);
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static inline usec_t usec_add(usec_t a, usec_t b) {
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/* Adds two time values, and makes sure USEC_INFINITY as input results as USEC_INFINITY in output,
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* and doesn't overflow. */
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if (a > USEC_INFINITY - b) /* overflow check */
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return USEC_INFINITY;
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return a + b;
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}
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static inline usec_t usec_sub_unsigned(usec_t timestamp, usec_t delta) {
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if (timestamp == USEC_INFINITY) /* Make sure infinity doesn't degrade */
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return USEC_INFINITY;
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if (timestamp < delta)
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return 0;
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return timestamp - delta;
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}
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static inline usec_t usec_sub_signed(usec_t timestamp, int64_t delta) {
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if (delta == INT64_MIN) { /* prevent overflow */
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assert_cc(-(INT64_MIN + 1) == INT64_MAX);
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assert_cc(USEC_INFINITY > INT64_MAX);
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return usec_add(timestamp, (usec_t) INT64_MAX + 1);
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}
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if (delta < 0)
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return usec_add(timestamp, (usec_t) (-delta));
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return usec_sub_unsigned(timestamp, (usec_t) delta);
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}
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static inline int usleep_safe(usec_t usec) {
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/* usleep() takes useconds_t that is (typically?) uint32_t. Also, usleep() may only support the
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* range [0, 1000000]. See usleep(3). Let's override usleep() with clock_nanosleep().
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*
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* ⚠️ Note we are not using plain nanosleep() here, since that operates on CLOCK_REALTIME, not
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* CLOCK_MONOTONIC! */
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if (usec == 0)
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return 0;
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// FIXME: use RET_NERRNO() macro here. Currently, this header cannot include errno-util.h.
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return clock_nanosleep(CLOCK_MONOTONIC, 0, TIMESPEC_STORE(usec), NULL) < 0 ? -errno : 0;
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}
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/* The last second we can format is 31. Dec 9999, 1s before midnight, because otherwise we'd enter 5 digit
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* year territory. However, since we want to stay away from this in all timezones we take one day off. */
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#define USEC_TIMESTAMP_FORMATTABLE_MAX_64BIT ((usec_t) 253402214399000000) /* Thu 9999-12-30 23:59:59 UTC */
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/* With a 32-bit time_t we can't go beyond 2038...
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* We parse timestamp with RFC-822/ISO 8601 (e.g. +06, or -03:00) as UTC, hence the upper bound must be off
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* by USEC_PER_DAY. See parse_timestamp() for more details. */
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#define USEC_TIMESTAMP_FORMATTABLE_MAX_32BIT (((usec_t) INT32_MAX) * USEC_PER_SEC - USEC_PER_DAY)
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#if SIZEOF_TIME_T == 8
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# define USEC_TIMESTAMP_FORMATTABLE_MAX USEC_TIMESTAMP_FORMATTABLE_MAX_64BIT
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#elif SIZEOF_TIME_T == 4
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# define USEC_TIMESTAMP_FORMATTABLE_MAX USEC_TIMESTAMP_FORMATTABLE_MAX_32BIT
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#else
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# error "Yuck, time_t is neither 4 nor 8 bytes wide?"
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#endif
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int time_change_fd(void);
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const char* timestamp_style_to_string(TimestampStyle t) _const_;
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TimestampStyle timestamp_style_from_string(const char *s) _pure_;
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