X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=src%2Fbasic%2Ftime-util.c;h=aadd3b7154858d1dbc1346a9ccaf808b32628ca9;hb=HEAD;hp=4c811d41f448a1f312e0105db8d1f40c012f2b1a;hpb=3389adca4a8f7dec9885fc8ce034e3302812e436;p=elogind.git diff --git a/src/basic/time-util.c b/src/basic/time-util.c index 4c811d41f..aadd3b715 100644 --- a/src/basic/time-util.c +++ b/src/basic/time-util.c @@ -40,14 +40,30 @@ #include "strv.h" #include "time-util.h" -#if 0 /// UNNEEDED by elogind -static nsec_t timespec_load_nsec(const struct timespec *ts); -#endif // 0 +static clockid_t map_clock_id(clockid_t c) { + + /* Some more exotic archs (s390, ppc, …) lack the "ALARM" flavour of the clocks. Thus, clock_gettime() will + * fail for them. Since they are essentially the same as their non-ALARM pendants (their only difference is + * when timers are set on them), let's just map them accordingly. This way, we can get the correct time even on + * those archs. */ + + switch (c) { + + case CLOCK_BOOTTIME_ALARM: + return CLOCK_BOOTTIME; + + case CLOCK_REALTIME_ALARM: + return CLOCK_REALTIME; + + default: + return c; + } +} usec_t now(clockid_t clock_id) { struct timespec ts; - assert_se(clock_gettime(clock_id, &ts) == 0); + assert_se(clock_gettime(map_clock_id(clock_id), &ts) == 0); return timespec_load(&ts); } @@ -56,7 +72,7 @@ usec_t now(clockid_t clock_id) { nsec_t now_nsec(clockid_t clock_id) { struct timespec ts; - assert_se(clock_gettime(clock_id, &ts) == 0); + assert_se(clock_gettime(map_clock_id(clock_id), &ts) == 0); return timespec_load_nsec(&ts); } @@ -71,6 +87,16 @@ dual_timestamp* dual_timestamp_get(dual_timestamp *ts) { return ts; } +triple_timestamp* triple_timestamp_get(triple_timestamp *ts) { + assert(ts); + + ts->realtime = now(CLOCK_REALTIME); + ts->monotonic = now(CLOCK_MONOTONIC); + ts->boottime = clock_boottime_supported() ? now(CLOCK_BOOTTIME) : USEC_INFINITY; + + return ts; +} + dual_timestamp* dual_timestamp_from_realtime(dual_timestamp *ts, usec_t u) { int64_t delta; assert(ts); @@ -83,12 +109,30 @@ dual_timestamp* dual_timestamp_from_realtime(dual_timestamp *ts, usec_t u) { ts->realtime = u; delta = (int64_t) now(CLOCK_REALTIME) - (int64_t) u; - ts->monotonic = usec_sub(now(CLOCK_MONOTONIC), delta); + ts->monotonic = usec_sub_signed(now(CLOCK_MONOTONIC), delta); return ts; } #if 0 /// UNNEEDED by elogind +triple_timestamp* triple_timestamp_from_realtime(triple_timestamp *ts, usec_t u) { + int64_t delta; + + assert(ts); + + if (u == USEC_INFINITY || u <= 0) { + ts->realtime = ts->monotonic = ts->boottime = u; + return ts; + } + + ts->realtime = u; + delta = (int64_t) now(CLOCK_REALTIME) - (int64_t) u; + ts->monotonic = usec_sub_signed(now(CLOCK_MONOTONIC), delta); + ts->boottime = clock_boottime_supported() ? usec_sub_signed(now(CLOCK_BOOTTIME), delta) : USEC_INFINITY; + + return ts; +} + dual_timestamp* dual_timestamp_from_monotonic(dual_timestamp *ts, usec_t u) { int64_t delta; assert(ts); @@ -100,7 +144,7 @@ dual_timestamp* dual_timestamp_from_monotonic(dual_timestamp *ts, usec_t u) { ts->monotonic = u; delta = (int64_t) now(CLOCK_MONOTONIC) - (int64_t) u; - ts->realtime = usec_sub(now(CLOCK_REALTIME), delta); + ts->realtime = usec_sub_signed(now(CLOCK_REALTIME), delta); return ts; } @@ -115,18 +159,37 @@ dual_timestamp* dual_timestamp_from_boottime_or_monotonic(dual_timestamp *ts, us dual_timestamp_get(ts); delta = (int64_t) now(clock_boottime_or_monotonic()) - (int64_t) u; - ts->realtime = usec_sub(ts->realtime, delta); - ts->monotonic = usec_sub(ts->monotonic, delta); + ts->realtime = usec_sub_signed(ts->realtime, delta); + ts->monotonic = usec_sub_signed(ts->monotonic, delta); return ts; } #endif // 0 +usec_t triple_timestamp_by_clock(triple_timestamp *ts, clockid_t clock) { + + switch (clock) { + + case CLOCK_REALTIME: + case CLOCK_REALTIME_ALARM: + return ts->realtime; + + case CLOCK_MONOTONIC: + return ts->monotonic; + + case CLOCK_BOOTTIME: + case CLOCK_BOOTTIME_ALARM: + return ts->boottime; + + default: + return USEC_INFINITY; + } +} + usec_t timespec_load(const struct timespec *ts) { assert(ts); - if (ts->tv_sec == (time_t) -1 && - ts->tv_nsec == (long) -1) + if (ts->tv_sec < 0 || ts->tv_nsec < 0) return USEC_INFINITY; if ((usec_t) ts->tv_sec > (UINT64_MAX - (ts->tv_nsec / NSEC_PER_USEC)) / USEC_PER_SEC) @@ -138,23 +201,24 @@ usec_t timespec_load(const struct timespec *ts) { } #if 0 /// UNNEEDED by elogind -static nsec_t timespec_load_nsec(const struct timespec *ts) { +nsec_t timespec_load_nsec(const struct timespec *ts) { assert(ts); - if (ts->tv_sec == (time_t) -1 && - ts->tv_nsec == (long) -1) + if (ts->tv_sec < 0 || ts->tv_nsec < 0) return NSEC_INFINITY; - return - (nsec_t) ts->tv_sec * NSEC_PER_SEC + - (nsec_t) ts->tv_nsec; + if ((nsec_t) ts->tv_sec >= (UINT64_MAX - ts->tv_nsec) / NSEC_PER_SEC) + return NSEC_INFINITY; + + return (nsec_t) ts->tv_sec * NSEC_PER_SEC + (nsec_t) ts->tv_nsec; } #endif // 0 struct timespec *timespec_store(struct timespec *ts, usec_t u) { assert(ts); - if (u == USEC_INFINITY) { + if (u == USEC_INFINITY || + u / USEC_PER_SEC >= TIME_T_MAX) { ts->tv_sec = (time_t) -1; ts->tv_nsec = (long) -1; return ts; @@ -169,8 +233,7 @@ struct timespec *timespec_store(struct timespec *ts, usec_t u) { usec_t timeval_load(const struct timeval *tv) { assert(tv); - if (tv->tv_sec == (time_t) -1 && - tv->tv_usec == (suseconds_t) -1) + if (tv->tv_sec < 0 || tv->tv_usec < 0) return USEC_INFINITY; if ((usec_t) tv->tv_sec > (UINT64_MAX - tv->tv_usec) / USEC_PER_SEC) @@ -184,7 +247,8 @@ usec_t timeval_load(const struct timeval *tv) { struct timeval *timeval_store(struct timeval *tv, usec_t u) { assert(tv); - if (u == USEC_INFINITY) { + if (u == USEC_INFINITY || + u / USEC_PER_SEC > TIME_T_MAX) { tv->tv_sec = (time_t) -1; tv->tv_usec = (suseconds_t) -1; } else { @@ -195,32 +259,97 @@ struct timeval *timeval_store(struct timeval *tv, usec_t u) { return tv; } -static char *format_timestamp_internal(char *buf, size_t l, usec_t t, - bool utc, bool us) { +static char *format_timestamp_internal( + char *buf, + size_t l, + usec_t t, + bool utc, + bool us) { + + /* The weekdays in non-localized (English) form. We use this instead of the localized form, so that our + * generated timestamps may be parsed with parse_timestamp(), and always read the same. */ + static const char * const weekdays[] = { + [0] = "Sun", + [1] = "Mon", + [2] = "Tue", + [3] = "Wed", + [4] = "Thu", + [5] = "Fri", + [6] = "Sat", + }; + struct tm tm; time_t sec; - int k; + size_t n; assert(buf); - assert(l > 0); + if (l < + 3 + /* week day */ + 1 + 10 + /* space and date */ + 1 + 8 + /* space and time */ + (us ? 1 + 6 : 0) + /* "." and microsecond part */ + 1 + 1 + /* space and shortest possible zone */ + 1) + return NULL; /* Not enough space even for the shortest form. */ if (t <= 0 || t == USEC_INFINITY) - return NULL; + return NULL; /* Timestamp is unset */ - sec = (time_t) (t / USEC_PER_SEC); - localtime_or_gmtime_r(&sec, &tm, utc); + /* Let's not format times with years > 9999 */ + if (t > USEC_TIMESTAMP_FORMATTABLE_MAX) + return NULL; - if (us) - k = strftime(buf, l, "%a %Y-%m-%d %H:%M:%S", &tm); - else - k = strftime(buf, l, "%a %Y-%m-%d %H:%M:%S %Z", &tm); + sec = (time_t) (t / USEC_PER_SEC); /* Round down */ - if (k <= 0) + if (!localtime_or_gmtime_r(&sec, &tm, utc)) return NULL; + + /* Start with the week day */ + assert((size_t) tm.tm_wday < ELEMENTSOF(weekdays)); + memcpy(buf, weekdays[tm.tm_wday], 4); + + /* Add the main components */ + if (strftime(buf + 3, l - 3, " %Y-%m-%d %H:%M:%S", &tm) <= 0) + return NULL; /* Doesn't fit */ + + /* Append the microseconds part, if that's requested */ if (us) { - snprintf(buf + strlen(buf), l - strlen(buf), ".%06llu", (unsigned long long) (t % USEC_PER_SEC)); - if (strftime(buf + strlen(buf), l - strlen(buf), " %Z", &tm) <= 0) - return NULL; + n = strlen(buf); + if (n + 8 > l) + return NULL; /* Microseconds part doesn't fit. */ + + sprintf(buf + n, ".%06"PRI_USEC, t % USEC_PER_SEC); + } + + /* Append the timezone */ + n = strlen(buf); + if (utc) { + /* If this is UTC then let's explicitly use the "UTC" string here, because gmtime_r() normally uses the + * obsolete "GMT" instead. */ + if (n + 5 > l) + return NULL; /* "UTC" doesn't fit. */ + + strcpy(buf + n, " UTC"); + + } else if (!isempty(tm.tm_zone)) { + size_t tn; + + /* An explicit timezone is specified, let's use it, if it fits */ + tn = strlen(tm.tm_zone); + if (n + 1 + tn + 1 > l) { + /* The full time zone does not fit in. Yuck. */ + + if (n + 1 + _POSIX_TZNAME_MAX + 1 > l) + return NULL; /* Not even enough space for the POSIX minimum (of 6)? In that case, complain that it doesn't fit */ + + /* So the time zone doesn't fit in fully, but the caller passed enough space for the POSIX + * minimum time zone length. In this case suppress the timezone entirely, in order not to dump + * an overly long, hard to read string on the user. This should be safe, because the user will + * assume the local timezone anyway if none is shown. And so does parse_timestamp(). */ + } else { + buf[n++] = ' '; + strcpy(buf + n, tm.tm_zone); + } } return buf; @@ -314,15 +443,15 @@ char *format_timespan(char *buf, size_t l, usec_t t, usec_t accuracy) { const char *suffix; usec_t usec; } table[] = { - { "y", USEC_PER_YEAR }, - { "month", USEC_PER_MONTH }, - { "w", USEC_PER_WEEK }, - { "d", USEC_PER_DAY }, - { "h", USEC_PER_HOUR }, - { "min", USEC_PER_MINUTE }, - { "s", USEC_PER_SEC }, - { "ms", USEC_PER_MSEC }, - { "us", 1 }, + { "y", USEC_PER_YEAR }, + { "month", USEC_PER_MONTH }, + { "w", USEC_PER_WEEK }, + { "d", USEC_PER_DAY }, + { "h", USEC_PER_HOUR }, + { "min", USEC_PER_MINUTE }, + { "s", USEC_PER_SEC }, + { "ms", USEC_PER_MSEC }, + { "us", 1 }, }; unsigned i; @@ -383,11 +512,11 @@ char *format_timespan(char *buf, size_t l, usec_t t, usec_t accuracy) { if (j > 0) { k = snprintf(p, l, - "%s"USEC_FMT".%0*llu%s", + "%s"USEC_FMT".%0*"PRI_USEC"%s", p > buf ? " " : "", a, j, - (unsigned long long) b, + b, table[i].suffix); t = 0; @@ -436,35 +565,50 @@ void dual_timestamp_serialize(FILE *f, const char *name, dual_timestamp *t) { } int dual_timestamp_deserialize(const char *value, dual_timestamp *t) { - unsigned long long a, b; + uint64_t a, b; + int r, pos; assert(value); assert(t); - if (sscanf(value, "%llu %llu", &a, &b) != 2) { - log_debug("Failed to parse finish timestamp value %s.", value); + pos = strspn(value, WHITESPACE); + if (value[pos] == '-') + return -EINVAL; + pos += strspn(value + pos, DIGITS); + pos += strspn(value + pos, WHITESPACE); + if (value[pos] == '-') + return -EINVAL; + + r = sscanf(value, "%" PRIu64 "%" PRIu64 "%n", &a, &b, &pos); + if (r != 2) { + log_debug("Failed to parse dual timestamp value \"%s\".", value); return -EINVAL; } + if (value[pos] != '\0') + /* trailing garbage */ + return -EINVAL; + t->realtime = a; t->monotonic = b; return 0; } -int deserialize_timestamp_value(const char *value, usec_t *timestamp) { +#endif // 0 +int timestamp_deserialize(const char *value, usec_t *timestamp) { int r; assert(value); r = safe_atou64(value, timestamp); - if (r < 0) - return log_debug_errno(r, "Failed to parse finish timestamp value \"%s\": %m", value); + return log_debug_errno(r, "Failed to parse timestamp value \"%s\": %m", value); return r; } +#if 0 /// UNNEEDED by elogind int parse_timestamp(const char *t, usec_t *usec) { static const struct { const char *name; @@ -486,12 +630,11 @@ int parse_timestamp(const char *t, usec_t *usec) { { "Sat", 6 }, }; - const char *k; - const char *utc; + const char *k, *utc, *tzn = NULL; struct tm tm, copy; time_t x; usec_t x_usec, plus = 0, minus = 0, ret; - int r, weekday = -1; + int r, weekday = -1, dst = -1; unsigned i; /* @@ -556,32 +699,71 @@ int parse_timestamp(const char *t, usec_t *usec) { goto finish; } + /* See if the timestamp is suffixed with UTC */ utc = endswith_no_case(t, " UTC"); if (utc) t = strndupa(t, utc - t); + else { + const char *e = NULL; + int j; + + tzset(); + + /* See if the timestamp is suffixed by either the DST or non-DST local timezone. Note that we only + * support the local timezones here, nothing else. Not because we wouldn't want to, but simply because + * there are no nice APIs available to cover this. By accepting the local time zone strings, we make + * sure that all timestamps written by format_timestamp() can be parsed correctly, even though we don't + * support arbitrary timezone specifications. */ + + for (j = 0; j <= 1; j++) { + + if (isempty(tzname[j])) + continue; + + e = endswith_no_case(t, tzname[j]); + if (!e) + continue; + if (e == t) + continue; + if (e[-1] != ' ') + continue; + + break; + } + + if (IN_SET(j, 0, 1)) { + /* Found one of the two timezones specified. */ + t = strndupa(t, e - t - 1); + dst = j; + tzn = tzname[j]; + } + } - x = ret / USEC_PER_SEC; + x = (time_t) (ret / USEC_PER_SEC); x_usec = 0; - assert_se(localtime_or_gmtime_r(&x, &tm, utc)); - tm.tm_isdst = -1; + if (!localtime_or_gmtime_r(&x, &tm, utc)) + return -EINVAL; + + tm.tm_isdst = dst; + if (tzn) + tm.tm_zone = tzn; if (streq(t, "today")) { tm.tm_sec = tm.tm_min = tm.tm_hour = 0; goto from_tm; } else if (streq(t, "yesterday")) { - tm.tm_mday --; + tm.tm_mday--; tm.tm_sec = tm.tm_min = tm.tm_hour = 0; goto from_tm; } else if (streq(t, "tomorrow")) { - tm.tm_mday ++; + tm.tm_mday++; tm.tm_sec = tm.tm_min = tm.tm_hour = 0; goto from_tm; } - for (i = 0; i < ELEMENTSOF(day_nr); i++) { size_t skip; @@ -674,25 +856,31 @@ parse_usec: return -EINVAL; x_usec = add; - } from_tm: x = mktime_or_timegm(&tm, utc); - if (x == (time_t) -1) + if (x < 0) return -EINVAL; if (weekday >= 0 && tm.tm_wday != weekday) return -EINVAL; ret = (usec_t) x * USEC_PER_SEC + x_usec; + if (ret > USEC_TIMESTAMP_FORMATTABLE_MAX) + return -EINVAL; finish: + if (ret + plus < ret) /* overflow? */ + return -EINVAL; ret += plus; - if (ret > minus) + if (ret > USEC_TIMESTAMP_FORMATTABLE_MAX) + return -EINVAL; + + if (ret >= minus) ret -= minus; else - ret = 0; + return -EINVAL; *usec = ret; @@ -700,42 +888,57 @@ finish: } #endif // 0 -int parse_time(const char *t, usec_t *usec, usec_t default_unit) { - +static char* extract_multiplier(char *p, usec_t *multiplier) { static const struct { const char *suffix; usec_t usec; } table[] = { - { "seconds", USEC_PER_SEC }, - { "second", USEC_PER_SEC }, - { "sec", USEC_PER_SEC }, - { "s", USEC_PER_SEC }, + { "seconds", USEC_PER_SEC }, + { "second", USEC_PER_SEC }, + { "sec", USEC_PER_SEC }, + { "s", USEC_PER_SEC }, { "minutes", USEC_PER_MINUTE }, - { "minute", USEC_PER_MINUTE }, - { "min", USEC_PER_MINUTE }, - { "months", USEC_PER_MONTH }, - { "month", USEC_PER_MONTH }, + { "minute", USEC_PER_MINUTE }, + { "min", USEC_PER_MINUTE }, + { "months", USEC_PER_MONTH }, + { "month", USEC_PER_MONTH }, { "M", USEC_PER_MONTH }, - { "msec", USEC_PER_MSEC }, - { "ms", USEC_PER_MSEC }, - { "m", USEC_PER_MINUTE }, - { "hours", USEC_PER_HOUR }, - { "hour", USEC_PER_HOUR }, - { "hr", USEC_PER_HOUR }, - { "h", USEC_PER_HOUR }, - { "days", USEC_PER_DAY }, - { "day", USEC_PER_DAY }, - { "d", USEC_PER_DAY }, - { "weeks", USEC_PER_WEEK }, - { "week", USEC_PER_WEEK }, - { "w", USEC_PER_WEEK }, - { "years", USEC_PER_YEAR }, - { "year", USEC_PER_YEAR }, - { "y", USEC_PER_YEAR }, - { "usec", 1ULL }, - { "us", 1ULL }, + { "msec", USEC_PER_MSEC }, + { "ms", USEC_PER_MSEC }, + { "m", USEC_PER_MINUTE }, + { "hours", USEC_PER_HOUR }, + { "hour", USEC_PER_HOUR }, + { "hr", USEC_PER_HOUR }, + { "h", USEC_PER_HOUR }, + { "days", USEC_PER_DAY }, + { "day", USEC_PER_DAY }, + { "d", USEC_PER_DAY }, + { "weeks", USEC_PER_WEEK }, + { "week", USEC_PER_WEEK }, + { "w", USEC_PER_WEEK }, + { "years", USEC_PER_YEAR }, + { "year", USEC_PER_YEAR }, + { "y", USEC_PER_YEAR }, + { "usec", 1ULL }, + { "us", 1ULL }, + { "µs", 1ULL }, }; + unsigned i; + for (i = 0; i < ELEMENTSOF(table); i++) { + char *e; + + e = startswith(p, table[i].suffix); + if (e) { + *multiplier = table[i].usec; + return e; + } + } + + return p; +} + +int parse_time(const char *t, usec_t *usec, usec_t default_unit) { const char *p, *s; usec_t r = 0; bool something = false; @@ -760,8 +963,8 @@ int parse_time(const char *t, usec_t *usec, usec_t default_unit) { for (;;) { long long l, z = 0; char *e; - unsigned i, n = 0; - usec_t multiplier, k; + unsigned n = 0; + usec_t multiplier = default_unit, k; p += strspn(p, WHITESPACE); @@ -774,10 +977,8 @@ int parse_time(const char *t, usec_t *usec, usec_t default_unit) { errno = 0; l = strtoll(p, &e, 10); - if (errno > 0) return -errno; - if (l < 0) return -ERANGE; @@ -801,18 +1002,7 @@ int parse_time(const char *t, usec_t *usec, usec_t default_unit) { return -EINVAL; e += strspn(e, WHITESPACE); - - for (i = 0; i < ELEMENTSOF(table); i++) - if (startswith(e, table[i].suffix)) { - multiplier = table[i].usec; - p = e + strlen(table[i].suffix); - break; - } - - if (i >= ELEMENTSOF(table)) { - multiplier = default_unit; - p = e; - } + p = extract_multiplier(e, &multiplier); something = true; @@ -834,6 +1024,16 @@ int parse_sec(const char *t, usec_t *usec) { } #if 0 /// UNNEEDED by elogind +int parse_sec_fix_0(const char *t, usec_t *usec) { + t += strspn(t, WHITESPACE); + if (streq(t, "0")) { + *usec = USEC_INFINITY; + return 0; + } + + return parse_sec(t, usec); +} + int parse_nsec(const char *t, nsec_t *nsec) { static const struct { const char *suffix; @@ -866,6 +1066,7 @@ int parse_nsec(const char *t, nsec_t *nsec) { { "y", NSEC_PER_YEAR }, { "usec", NSEC_PER_USEC }, { "us", NSEC_PER_USEC }, + { "µs", NSEC_PER_USEC }, { "nsec", 1ULL }, { "ns", 1ULL }, { "", 1ULL }, /* default is nsec */ @@ -1076,24 +1277,72 @@ bool timezone_is_valid(const char *name) { return true; } -clockid_t clock_boottime_or_monotonic(void) { - static clockid_t clock = -1; - int fd; +#endif // 0 +bool clock_boottime_supported(void) { + static int supported = -1; - if (clock != -1) - return clock; + /* Note that this checks whether CLOCK_BOOTTIME is available in general as well as available for timerfds()! */ - fd = timerfd_create(CLOCK_BOOTTIME, TFD_NONBLOCK|TFD_CLOEXEC); - if (fd < 0) - clock = CLOCK_MONOTONIC; - else { - safe_close(fd); - clock = CLOCK_BOOTTIME; + if (supported < 0) { + int fd; + + fd = timerfd_create(CLOCK_BOOTTIME, TFD_NONBLOCK|TFD_CLOEXEC); + if (fd < 0) + supported = false; + else { + safe_close(fd); + supported = true; + } } - return clock; + return supported; } +#if 0 /// UNNEEDED by elogind +clockid_t clock_boottime_or_monotonic(void) { + if (clock_boottime_supported()) + return CLOCK_BOOTTIME; + else + return CLOCK_MONOTONIC; +} +#endif // 0 + +#if 1 /// let's add a diagnostic push to silence -Wimplicit-fallthrough to elogind +# ifdef __GNUC__ +# pragma GCC diagnostic push +# pragma GCC diagnostic ignored "-Wimplicit-fallthrough" +# endif // __GNUC__ +#endif // 1 +bool clock_supported(clockid_t clock) { + struct timespec ts; + + switch (clock) { + + case CLOCK_MONOTONIC: + case CLOCK_REALTIME: + return true; + + case CLOCK_BOOTTIME: + return clock_boottime_supported(); + + case CLOCK_BOOTTIME_ALARM: + if (!clock_boottime_supported()) + return false; + + /* fall through */ + + default: + /* For everything else, check properly */ + return clock_gettime(clock, &ts) >= 0; + } +} +#if 1 /// end diagnostic push in elogind +# ifdef __GNUC__ +# pragma GCC diagnostic pop +# endif // __GNUC__ +#endif // 1 + +#if 0 /// UNNEEDED by elogind int get_timezone(char **tz) { _cleanup_free_ char *t = NULL; const char *e; @@ -1139,9 +1388,28 @@ unsigned long usec_to_jiffies(usec_t u) { r = sysconf(_SC_CLK_TCK); assert(r > 0); - hz = (unsigned long) r; + hz = r; } return DIV_ROUND_UP(u , USEC_PER_SEC / hz); } + +usec_t usec_shift_clock(usec_t x, clockid_t from, clockid_t to) { + usec_t a, b; + + if (x == USEC_INFINITY) + return USEC_INFINITY; + if (map_clock_id(from) == map_clock_id(to)) + return x; + + a = now(from); + b = now(to); + + if (x > a) + /* x lies in the future */ + return usec_add(b, usec_sub_unsigned(x, a)); + else + /* x lies in the past */ + return usec_sub_unsigned(b, usec_sub_unsigned(a, x)); +} #endif // 0