/* $NetBSD: time.c,v 1.2.4.2 2024/02/29 12:35:04 martin Exp $ */ /* * Copyright (C) Internet Systems Consortium, Inc. ("ISC") * * SPDX-License-Identifier: MPL-2.0 * * This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, you can obtain one at https://mozilla.org/MPL/2.0/. * * See the COPYRIGHT file distributed with this work for additional * information regarding copyright ownership. */ /*! \file */ #include #include #include #include #include #include /* Required for struct timeval on some platforms. */ #include #include #include #include #include #include #include #include #if defined(CLOCK_REALTIME) #define CLOCKSOURCE_HIRES CLOCK_REALTIME #endif /* #if defined(CLOCK_REALTIME) */ #if defined(CLOCK_REALTIME_COARSE) #define CLOCKSOURCE CLOCK_REALTIME_COARSE #elif defined(CLOCK_REALTIME_FAST) #define CLOCKSOURCE CLOCK_REALTIME_FAST #else /* if defined(CLOCK_REALTIME_COARSE) */ #define CLOCKSOURCE CLOCK_REALTIME #endif /* if defined(CLOCK_REALTIME_COARSE) */ #if !defined(CLOCKSOURCE_HIRES) #define CLOCKSOURCE_HIRES CLOCKSOURCE #endif /* #ifndef CLOCKSOURCE_HIRES */ /*% *** Intervals ***/ #if !defined(UNIT_TESTING) static const isc_interval_t zero_interval = { 0, 0 }; const isc_interval_t *const isc_interval_zero = &zero_interval; #endif void isc_interval_set(isc_interval_t *i, unsigned int seconds, unsigned int nanoseconds) { REQUIRE(i != NULL); REQUIRE(nanoseconds < NS_PER_SEC); i->seconds = seconds; i->nanoseconds = nanoseconds; } bool isc_interval_iszero(const isc_interval_t *i) { REQUIRE(i != NULL); INSIST(i->nanoseconds < NS_PER_SEC); if (i->seconds == 0 && i->nanoseconds == 0) { return (true); } return (false); } unsigned int isc_interval_ms(const isc_interval_t *i) { REQUIRE(i != NULL); INSIST(i->nanoseconds < NS_PER_SEC); return ((i->seconds * MS_PER_SEC) + (i->nanoseconds / NS_PER_MS)); } /*** *** Absolute Times ***/ #if !defined(UNIT_TESTING) static const isc_time_t epoch = { 0, 0 }; const isc_time_t *const isc_time_epoch = &epoch; #endif void isc_time_set(isc_time_t *t, unsigned int seconds, unsigned int nanoseconds) { REQUIRE(t != NULL); REQUIRE(nanoseconds < NS_PER_SEC); t->seconds = seconds; t->nanoseconds = nanoseconds; } void isc_time_settoepoch(isc_time_t *t) { REQUIRE(t != NULL); t->seconds = 0; t->nanoseconds = 0; } bool isc_time_isepoch(const isc_time_t *t) { REQUIRE(t != NULL); INSIST(t->nanoseconds < NS_PER_SEC); if (t->seconds == 0 && t->nanoseconds == 0) { return (true); } return (false); } static isc_result_t time_now(isc_time_t *t, clockid_t clock) { struct timespec ts; REQUIRE(t != NULL); if (clock_gettime(clock, &ts) == -1) { UNEXPECTED_SYSERROR(errno, "clock_gettime()"); return (ISC_R_UNEXPECTED); } if (ts.tv_sec < 0 || ts.tv_nsec < 0 || ts.tv_nsec >= NS_PER_SEC) { return (ISC_R_UNEXPECTED); } /* * Ensure the tv_sec value fits in t->seconds. */ if (sizeof(ts.tv_sec) > sizeof(t->seconds) && ((ts.tv_sec | (unsigned int)-1) ^ (unsigned int)-1) != 0U) { return (ISC_R_RANGE); } t->seconds = ts.tv_sec; t->nanoseconds = ts.tv_nsec; return (ISC_R_SUCCESS); } isc_result_t isc_time_now_hires(isc_time_t *t) { return time_now(t, CLOCKSOURCE_HIRES); } isc_result_t isc_time_now(isc_time_t *t) { return time_now(t, CLOCKSOURCE); } isc_result_t isc_time_nowplusinterval(isc_time_t *t, const isc_interval_t *i) { struct timespec ts; REQUIRE(t != NULL); REQUIRE(i != NULL); INSIST(i->nanoseconds < NS_PER_SEC); if (clock_gettime(CLOCKSOURCE, &ts) == -1) { UNEXPECTED_SYSERROR(errno, "clock_gettime()"); return (ISC_R_UNEXPECTED); } if (ts.tv_sec < 0 || ts.tv_nsec < 0 || ts.tv_nsec >= NS_PER_SEC) { return (ISC_R_UNEXPECTED); } /* * Ensure the resulting seconds value fits in the size of an * unsigned int. (It is written this way as a slight optimization; * note that even if both values == INT_MAX, then when added * and getting another 1 added below the result is UINT_MAX.) */ if ((ts.tv_sec > INT_MAX || i->seconds > INT_MAX) && ((long long)ts.tv_sec + i->seconds > UINT_MAX)) { return (ISC_R_RANGE); } t->seconds = ts.tv_sec + i->seconds; t->nanoseconds = ts.tv_nsec + i->nanoseconds; if (t->nanoseconds >= NS_PER_SEC) { t->seconds++; t->nanoseconds -= NS_PER_SEC; } return (ISC_R_SUCCESS); } int isc_time_compare(const isc_time_t *t1, const isc_time_t *t2) { REQUIRE(t1 != NULL && t2 != NULL); INSIST(t1->nanoseconds < NS_PER_SEC && t2->nanoseconds < NS_PER_SEC); if (t1->seconds < t2->seconds) { return (-1); } if (t1->seconds > t2->seconds) { return (1); } if (t1->nanoseconds < t2->nanoseconds) { return (-1); } if (t1->nanoseconds > t2->nanoseconds) { return (1); } return (0); } isc_result_t isc_time_add(const isc_time_t *t, const isc_interval_t *i, isc_time_t *result) { REQUIRE(t != NULL && i != NULL && result != NULL); REQUIRE(t->nanoseconds < NS_PER_SEC && i->nanoseconds < NS_PER_SEC); /* Seconds */ #if HAVE_BUILTIN_OVERFLOW if (__builtin_uadd_overflow(t->seconds, i->seconds, &result->seconds)) { return (ISC_R_RANGE); } #else if (t->seconds > UINT_MAX - i->seconds) { return (ISC_R_RANGE); } result->seconds = t->seconds + i->seconds; #endif /* Nanoseconds */ result->nanoseconds = t->nanoseconds + i->nanoseconds; if (result->nanoseconds >= NS_PER_SEC) { if (result->seconds == UINT_MAX) { return (ISC_R_RANGE); } result->nanoseconds -= NS_PER_SEC; result->seconds++; } return (ISC_R_SUCCESS); } isc_result_t isc_time_subtract(const isc_time_t *t, const isc_interval_t *i, isc_time_t *result) { REQUIRE(t != NULL && i != NULL && result != NULL); REQUIRE(t->nanoseconds < NS_PER_SEC && i->nanoseconds < NS_PER_SEC); /* Seconds */ #if HAVE_BUILTIN_OVERFLOW if (__builtin_usub_overflow(t->seconds, i->seconds, &result->seconds)) { return (ISC_R_RANGE); } #else if (t->seconds < i->seconds) { return (ISC_R_RANGE); } result->seconds = t->seconds - i->seconds; #endif /* Nanoseconds */ if (t->nanoseconds >= i->nanoseconds) { result->nanoseconds = t->nanoseconds - i->nanoseconds; } else { if (result->seconds == 0) { return (ISC_R_RANGE); } result->seconds--; result->nanoseconds = NS_PER_SEC + t->nanoseconds - i->nanoseconds; } return (ISC_R_SUCCESS); } uint64_t isc_time_microdiff(const isc_time_t *t1, const isc_time_t *t2) { uint64_t i1, i2, i3; REQUIRE(t1 != NULL && t2 != NULL); INSIST(t1->nanoseconds < NS_PER_SEC && t2->nanoseconds < NS_PER_SEC); i1 = (uint64_t)t1->seconds * NS_PER_SEC + t1->nanoseconds; i2 = (uint64_t)t2->seconds * NS_PER_SEC + t2->nanoseconds; if (i1 <= i2) { return (0); } i3 = i1 - i2; /* * Convert to microseconds. */ i3 /= NS_PER_US; return (i3); } uint32_t isc_time_seconds(const isc_time_t *t) { REQUIRE(t != NULL); INSIST(t->nanoseconds < NS_PER_SEC); return ((uint32_t)t->seconds); } isc_result_t isc_time_secondsastimet(const isc_time_t *t, time_t *secondsp) { time_t seconds; REQUIRE(t != NULL); INSIST(t->nanoseconds < NS_PER_SEC); /* * Ensure that the number of seconds represented by t->seconds * can be represented by a time_t. Since t->seconds is an * unsigned int and since time_t is mostly opaque, this is * trickier than it seems. (This standardized opaqueness of * time_t is *very* frustrating; time_t is not even limited to * being an integral type.) * * The mission, then, is to avoid generating any kind of warning * about "signed versus unsigned" while trying to determine if * the unsigned int t->seconds is out range for tv_sec, * which is pretty much only true if time_t is a signed integer * of the same size as the return value of isc_time_seconds. * * If the paradox in the if clause below is true, t->seconds is * out of range for time_t. */ seconds = (time_t)t->seconds; INSIST(sizeof(unsigned int) == sizeof(uint32_t)); INSIST(sizeof(time_t) >= sizeof(uint32_t)); if (t->seconds > (~0U >> 1) && seconds <= (time_t)(~0U >> 1)) { return (ISC_R_RANGE); } *secondsp = seconds; return (ISC_R_SUCCESS); } uint32_t isc_time_nanoseconds(const isc_time_t *t) { REQUIRE(t != NULL); ENSURE(t->nanoseconds < NS_PER_SEC); return ((uint32_t)t->nanoseconds); } void isc_time_formattimestamp(const isc_time_t *t, char *buf, unsigned int len) { time_t now; unsigned int flen; struct tm tm; REQUIRE(t != NULL); INSIST(t->nanoseconds < NS_PER_SEC); REQUIRE(buf != NULL); REQUIRE(len > 0); now = (time_t)t->seconds; flen = strftime(buf, len, "%d-%b-%Y %X", localtime_r(&now, &tm)); INSIST(flen < len); if (flen != 0) { snprintf(buf + flen, len - flen, ".%03u", t->nanoseconds / NS_PER_MS); } else { strlcpy(buf, "99-Bad-9999 99:99:99.999", len); } } void isc_time_formathttptimestamp(const isc_time_t *t, char *buf, unsigned int len) { time_t now; unsigned int flen; struct tm tm; REQUIRE(t != NULL); INSIST(t->nanoseconds < NS_PER_SEC); REQUIRE(buf != NULL); REQUIRE(len > 0); /* * 5 spaces, 1 comma, 3 GMT, 2 %d, 4 %Y, 8 %H:%M:%S, 3+ %a, 3+ * %b (29+) */ now = (time_t)t->seconds; flen = strftime(buf, len, "%a, %d %b %Y %H:%M:%S GMT", gmtime_r(&now, &tm)); INSIST(flen < len); } isc_result_t isc_time_parsehttptimestamp(char *buf, isc_time_t *t) { struct tm t_tm; time_t when; char *p; REQUIRE(buf != NULL); REQUIRE(t != NULL); p = isc_tm_strptime(buf, "%a, %d %b %Y %H:%M:%S", &t_tm); if (p == NULL) { return (ISC_R_UNEXPECTED); } when = isc_tm_timegm(&t_tm); if (when == -1) { return (ISC_R_UNEXPECTED); } isc_time_set(t, when, 0); return (ISC_R_SUCCESS); } void isc_time_formatISO8601L(const isc_time_t *t, char *buf, unsigned int len) { time_t now; unsigned int flen; struct tm tm; REQUIRE(t != NULL); INSIST(t->nanoseconds < NS_PER_SEC); REQUIRE(buf != NULL); REQUIRE(len > 0); now = (time_t)t->seconds; flen = strftime(buf, len, "%Y-%m-%dT%H:%M:%S", localtime_r(&now, &tm)); INSIST(flen < len); } void isc_time_formatISO8601Lms(const isc_time_t *t, char *buf, unsigned int len) { time_t now; unsigned int flen; struct tm tm; REQUIRE(t != NULL); INSIST(t->nanoseconds < NS_PER_SEC); REQUIRE(buf != NULL); REQUIRE(len > 0); now = (time_t)t->seconds; flen = strftime(buf, len, "%Y-%m-%dT%H:%M:%S", localtime_r(&now, &tm)); INSIST(flen < len); if (flen > 0U && len - flen >= 6) { snprintf(buf + flen, len - flen, ".%03u", t->nanoseconds / NS_PER_MS); } } void isc_time_formatISO8601Lus(const isc_time_t *t, char *buf, unsigned int len) { time_t now; unsigned int flen; struct tm tm; REQUIRE(t != NULL); INSIST(t->nanoseconds < NS_PER_SEC); REQUIRE(buf != NULL); REQUIRE(len > 0); now = (time_t)t->seconds; flen = strftime(buf, len, "%Y-%m-%dT%H:%M:%S", localtime_r(&now, &tm)); INSIST(flen < len); if (flen > 0U && len - flen >= 6) { snprintf(buf + flen, len - flen, ".%06u", t->nanoseconds / NS_PER_US); } } void isc_time_formatISO8601(const isc_time_t *t, char *buf, unsigned int len) { time_t now; unsigned int flen; struct tm tm; REQUIRE(t != NULL); INSIST(t->nanoseconds < NS_PER_SEC); REQUIRE(buf != NULL); REQUIRE(len > 0); now = (time_t)t->seconds; flen = strftime(buf, len, "%Y-%m-%dT%H:%M:%SZ", gmtime_r(&now, &tm)); INSIST(flen < len); } void isc_time_formatISO8601ms(const isc_time_t *t, char *buf, unsigned int len) { time_t now; unsigned int flen; struct tm tm; REQUIRE(t != NULL); INSIST(t->nanoseconds < NS_PER_SEC); REQUIRE(buf != NULL); REQUIRE(len > 0); now = (time_t)t->seconds; flen = strftime(buf, len, "%Y-%m-%dT%H:%M:%SZ", gmtime_r(&now, &tm)); INSIST(flen < len); if (flen > 0U && len - flen >= 5) { flen -= 1; /* rewind one character (Z) */ snprintf(buf + flen, len - flen, ".%03uZ", t->nanoseconds / NS_PER_MS); } } void isc_time_formatISO8601us(const isc_time_t *t, char *buf, unsigned int len) { time_t now; unsigned int flen; struct tm tm; REQUIRE(t != NULL); INSIST(t->nanoseconds < NS_PER_SEC); REQUIRE(buf != NULL); REQUIRE(len > 0); now = (time_t)t->seconds; flen = strftime(buf, len, "%Y-%m-%dT%H:%M:%SZ", gmtime_r(&now, &tm)); INSIST(flen < len); if (flen > 0U && len - flen >= 5) { flen -= 1; /* rewind one character (Z) */ snprintf(buf + flen, len - flen, ".%06uZ", t->nanoseconds / NS_PER_US); } } void isc_time_formatshorttimestamp(const isc_time_t *t, char *buf, unsigned int len) { time_t now; unsigned int flen; struct tm tm; REQUIRE(t != NULL); INSIST(t->nanoseconds < NS_PER_SEC); REQUIRE(buf != NULL); REQUIRE(len > 0); now = (time_t)t->seconds; flen = strftime(buf, len, "%Y%m%d%H%M%S", gmtime_r(&now, &tm)); INSIST(flen < len); if (flen > 0U && len - flen >= 5) { snprintf(buf + flen, len - flen, "%03u", t->nanoseconds / NS_PER_MS); } }