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-rw-r--r--src/basic/time-util.c218
1 files changed, 195 insertions, 23 deletions
diff --git a/src/basic/time-util.c b/src/basic/time-util.c
index edd9179cb8..0ef1f6393e 100644
--- a/src/basic/time-util.c
+++ b/src/basic/time-util.c
@@ -87,6 +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);
@@ -104,6 +114,24 @@ dual_timestamp* dual_timestamp_from_realtime(dual_timestamp *ts, usec_t u) {
return ts;
}
+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(now(CLOCK_MONOTONIC), delta);
+ ts->boottime = clock_boottime_supported() ? usec_sub(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);
@@ -136,6 +164,26 @@ dual_timestamp* dual_timestamp_from_boottime_or_monotonic(dual_timestamp *ts, us
return ts;
}
+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);
@@ -206,32 +254,95 @@ 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; /* Timestamp is unset */
+
+ sec = (time_t) (t / USEC_PER_SEC); /* Round down */
+ if ((usec_t) sec != (t / USEC_PER_SEC))
+ return NULL; /* overflow? */
+
+ if (!localtime_or_gmtime_r(&sec, &tm, utc))
return NULL;
- sec = (time_t) (t / USEC_PER_SEC);
- localtime_or_gmtime_r(&sec, &tm, utc);
+ /* Start with the week day */
+ assert((size_t) tm.tm_wday < ELEMENTSOF(weekdays));
+ memcpy(buf, weekdays[tm.tm_wday], 4);
- 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);
+ /* Add the main components */
+ if (strftime(buf + 3, l - 3, " %Y-%m-%d %H:%M:%S", &tm) <= 0)
+ return NULL; /* Doesn't fit */
- if (k <= 0)
- return NULL;
+ /* 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, ".%06llu", (unsigned long long) (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;
@@ -491,12 +602,11 @@ 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;
/*
@@ -561,15 +671,55 @@ 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++) {
- x = ret / USEC_PER_SEC;
+ 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 = (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;
@@ -586,7 +736,6 @@ int parse_timestamp(const char *t, usec_t *usec) {
goto from_tm;
}
-
for (i = 0; i < ELEMENTSOF(day_nr); i++) {
size_t skip;
@@ -679,7 +828,6 @@ parse_usec:
return -EINVAL;
x_usec = add;
-
}
from_tm:
@@ -1107,6 +1255,30 @@ clockid_t clock_boottime_or_monotonic(void) {
return CLOCK_MONOTONIC;
}
+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, after checking the cached value for CLOCK_BOOTTIME. */
+
+ default:
+ /* For everything else, check properly */
+ return clock_gettime(clock, &ts) >= 0;
+ }
+}
+
int get_timezone(char **tz) {
_cleanup_free_ char *t = NULL;
const char *e;
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2025-01-02 13:24:11 +0000