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-rw-r--r--src/basic/time-util.c1471
1 files changed, 1471 insertions, 0 deletions
diff --git a/src/basic/time-util.c b/src/basic/time-util.c
new file mode 100644
index 0000000..62cdc30
--- /dev/null
+++ b/src/basic/time-util.c
@@ -0,0 +1,1471 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#include <ctype.h>
+#include <errno.h>
+#include <limits.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+#include <sys/timerfd.h>
+#include <sys/timex.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "alloc-util.h"
+#include "fd-util.h"
+#include "fileio.h"
+#include "fs-util.h"
+#include "io-util.h"
+#include "log.h"
+#include "macro.h"
+#include "missing_timerfd.h"
+#include "parse-util.h"
+#include "path-util.h"
+#include "process-util.h"
+#include "stat-util.h"
+#include "string-util.h"
+#include "strv.h"
+#include "time-util.h"
+
+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(map_clock_id(clock_id), &ts) == 0);
+
+ return timespec_load(&ts);
+}
+
+nsec_t now_nsec(clockid_t clock_id) {
+ struct timespec ts;
+
+ assert_se(clock_gettime(map_clock_id(clock_id), &ts) == 0);
+
+ return timespec_load_nsec(&ts);
+}
+
+dual_timestamp* dual_timestamp_get(dual_timestamp *ts) {
+ assert(ts);
+
+ ts->realtime = now(CLOCK_REALTIME);
+ ts->monotonic = now(CLOCK_MONOTONIC);
+
+ 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);
+
+ if (u == USEC_INFINITY || u <= 0) {
+ ts->realtime = ts->monotonic = u;
+ return ts;
+ }
+
+ ts->realtime = u;
+
+ delta = (int64_t) now(CLOCK_REALTIME) - (int64_t) u;
+ ts->monotonic = usec_sub_signed(now(CLOCK_MONOTONIC), delta);
+
+ 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_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);
+
+ if (u == USEC_INFINITY) {
+ ts->realtime = ts->monotonic = USEC_INFINITY;
+ return ts;
+ }
+
+ ts->monotonic = u;
+ delta = (int64_t) now(CLOCK_MONOTONIC) - (int64_t) u;
+ ts->realtime = usec_sub_signed(now(CLOCK_REALTIME), delta);
+
+ return ts;
+}
+
+dual_timestamp* dual_timestamp_from_boottime_or_monotonic(dual_timestamp *ts, usec_t u) {
+ int64_t delta;
+
+ if (u == USEC_INFINITY) {
+ ts->realtime = ts->monotonic = USEC_INFINITY;
+ return ts;
+ }
+
+ dual_timestamp_get(ts);
+ delta = (int64_t) now(clock_boottime_or_monotonic()) - (int64_t) u;
+ ts->realtime = usec_sub_signed(ts->realtime, delta);
+ ts->monotonic = usec_sub_signed(ts->monotonic, delta);
+
+ 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);
+
+ 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)
+ return USEC_INFINITY;
+
+ return
+ (usec_t) ts->tv_sec * USEC_PER_SEC +
+ (usec_t) ts->tv_nsec / NSEC_PER_USEC;
+}
+
+nsec_t timespec_load_nsec(const struct timespec *ts) {
+ assert(ts);
+
+ if (ts->tv_sec < 0 || ts->tv_nsec < 0)
+ return NSEC_INFINITY;
+
+ 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;
+}
+
+struct timespec *timespec_store(struct timespec *ts, usec_t u) {
+ assert(ts);
+
+ if (u == USEC_INFINITY ||
+ u / USEC_PER_SEC >= TIME_T_MAX) {
+ ts->tv_sec = (time_t) -1;
+ ts->tv_nsec = (long) -1;
+ return ts;
+ }
+
+ ts->tv_sec = (time_t) (u / USEC_PER_SEC);
+ ts->tv_nsec = (long int) ((u % USEC_PER_SEC) * NSEC_PER_USEC);
+
+ return ts;
+}
+
+usec_t timeval_load(const struct timeval *tv) {
+ assert(tv);
+
+ 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)
+ return USEC_INFINITY;
+
+ return
+ (usec_t) tv->tv_sec * USEC_PER_SEC +
+ (usec_t) tv->tv_usec;
+}
+
+struct timeval *timeval_store(struct timeval *tv, usec_t u) {
+ assert(tv);
+
+ if (u == USEC_INFINITY ||
+ u / USEC_PER_SEC > TIME_T_MAX) {
+ tv->tv_sec = (time_t) -1;
+ tv->tv_usec = (suseconds_t) -1;
+ } else {
+ tv->tv_sec = (time_t) (u / USEC_PER_SEC);
+ tv->tv_usec = (suseconds_t) (u % USEC_PER_SEC);
+ }
+
+ return tv;
+}
+
+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;
+ size_t n;
+
+ assert(buf);
+
+ 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 */
+
+ /* Let's not format times with years > 9999 */
+ if (t > USEC_TIMESTAMP_FORMATTABLE_MAX) {
+ assert(l >= STRLEN("--- XXXX-XX-XX XX:XX:XX") + 1);
+ strcpy(buf, "--- XXXX-XX-XX XX:XX:XX");
+ return buf;
+ }
+
+ sec = (time_t) (t / USEC_PER_SEC); /* Round down */
+
+ 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) {
+ 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;
+}
+
+char *format_timestamp(char *buf, size_t l, usec_t t) {
+ return format_timestamp_internal(buf, l, t, false, false);
+}
+
+char *format_timestamp_utc(char *buf, size_t l, usec_t t) {
+ return format_timestamp_internal(buf, l, t, true, false);
+}
+
+char *format_timestamp_us(char *buf, size_t l, usec_t t) {
+ return format_timestamp_internal(buf, l, t, false, true);
+}
+
+char *format_timestamp_us_utc(char *buf, size_t l, usec_t t) {
+ return format_timestamp_internal(buf, l, t, true, true);
+}
+
+char *format_timestamp_relative(char *buf, size_t l, usec_t t) {
+ const char *s;
+ usec_t n, d;
+
+ if (t <= 0 || t == USEC_INFINITY)
+ return NULL;
+
+ n = now(CLOCK_REALTIME);
+ if (n > t) {
+ d = n - t;
+ s = "ago";
+ } else {
+ d = t - n;
+ s = "left";
+ }
+
+ if (d >= USEC_PER_YEAR)
+ snprintf(buf, l, USEC_FMT " years " USEC_FMT " months %s",
+ d / USEC_PER_YEAR,
+ (d % USEC_PER_YEAR) / USEC_PER_MONTH, s);
+ else if (d >= USEC_PER_MONTH)
+ snprintf(buf, l, USEC_FMT " months " USEC_FMT " days %s",
+ d / USEC_PER_MONTH,
+ (d % USEC_PER_MONTH) / USEC_PER_DAY, s);
+ else if (d >= USEC_PER_WEEK)
+ snprintf(buf, l, USEC_FMT " weeks " USEC_FMT " days %s",
+ d / USEC_PER_WEEK,
+ (d % USEC_PER_WEEK) / USEC_PER_DAY, s);
+ else if (d >= 2*USEC_PER_DAY)
+ snprintf(buf, l, USEC_FMT " days %s", d / USEC_PER_DAY, s);
+ else if (d >= 25*USEC_PER_HOUR)
+ snprintf(buf, l, "1 day " USEC_FMT "h %s",
+ (d - USEC_PER_DAY) / USEC_PER_HOUR, s);
+ else if (d >= 6*USEC_PER_HOUR)
+ snprintf(buf, l, USEC_FMT "h %s",
+ d / USEC_PER_HOUR, s);
+ else if (d >= USEC_PER_HOUR)
+ snprintf(buf, l, USEC_FMT "h " USEC_FMT "min %s",
+ d / USEC_PER_HOUR,
+ (d % USEC_PER_HOUR) / USEC_PER_MINUTE, s);
+ else if (d >= 5*USEC_PER_MINUTE)
+ snprintf(buf, l, USEC_FMT "min %s",
+ d / USEC_PER_MINUTE, s);
+ else if (d >= USEC_PER_MINUTE)
+ snprintf(buf, l, USEC_FMT "min " USEC_FMT "s %s",
+ d / USEC_PER_MINUTE,
+ (d % USEC_PER_MINUTE) / USEC_PER_SEC, s);
+ else if (d >= USEC_PER_SEC)
+ snprintf(buf, l, USEC_FMT "s %s",
+ d / USEC_PER_SEC, s);
+ else if (d >= USEC_PER_MSEC)
+ snprintf(buf, l, USEC_FMT "ms %s",
+ d / USEC_PER_MSEC, s);
+ else if (d > 0)
+ snprintf(buf, l, USEC_FMT"us %s",
+ d, s);
+ else
+ snprintf(buf, l, "now");
+
+ buf[l-1] = 0;
+ return buf;
+}
+
+char *format_timespan(char *buf, size_t l, usec_t t, usec_t accuracy) {
+ static const struct {
+ 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 },
+ };
+
+ size_t i;
+ char *p = buf;
+ bool something = false;
+
+ assert(buf);
+ assert(l > 0);
+
+ if (t == USEC_INFINITY) {
+ strncpy(p, "infinity", l-1);
+ p[l-1] = 0;
+ return p;
+ }
+
+ if (t <= 0) {
+ strncpy(p, "0", l-1);
+ p[l-1] = 0;
+ return p;
+ }
+
+ /* The result of this function can be parsed with parse_sec */
+
+ for (i = 0; i < ELEMENTSOF(table); i++) {
+ int k = 0;
+ size_t n;
+ bool done = false;
+ usec_t a, b;
+
+ if (t <= 0)
+ break;
+
+ if (t < accuracy && something)
+ break;
+
+ if (t < table[i].usec)
+ continue;
+
+ if (l <= 1)
+ break;
+
+ a = t / table[i].usec;
+ b = t % table[i].usec;
+
+ /* Let's see if we should shows this in dot notation */
+ if (t < USEC_PER_MINUTE && b > 0) {
+ usec_t cc;
+ signed char j;
+
+ j = 0;
+ for (cc = table[i].usec; cc > 1; cc /= 10)
+ j++;
+
+ for (cc = accuracy; cc > 1; cc /= 10) {
+ b /= 10;
+ j--;
+ }
+
+ if (j > 0) {
+ k = snprintf(p, l,
+ "%s"USEC_FMT".%0*"PRI_USEC"%s",
+ p > buf ? " " : "",
+ a,
+ j,
+ b,
+ table[i].suffix);
+
+ t = 0;
+ done = true;
+ }
+ }
+
+ /* No? Then let's show it normally */
+ if (!done) {
+ k = snprintf(p, l,
+ "%s"USEC_FMT"%s",
+ p > buf ? " " : "",
+ a,
+ table[i].suffix);
+
+ t = b;
+ }
+
+ n = MIN((size_t) k, l);
+
+ l -= n;
+ p += n;
+
+ something = true;
+ }
+
+ *p = 0;
+
+ return buf;
+}
+
+static int parse_timestamp_impl(const char *t, usec_t *usec, bool with_tz) {
+ static const struct {
+ const char *name;
+ const int nr;
+ } day_nr[] = {
+ { "Sunday", 0 },
+ { "Sun", 0 },
+ { "Monday", 1 },
+ { "Mon", 1 },
+ { "Tuesday", 2 },
+ { "Tue", 2 },
+ { "Wednesday", 3 },
+ { "Wed", 3 },
+ { "Thursday", 4 },
+ { "Thu", 4 },
+ { "Friday", 5 },
+ { "Fri", 5 },
+ { "Saturday", 6 },
+ { "Sat", 6 },
+ };
+
+ const char *k, *utc = NULL, *tzn = NULL;
+ struct tm tm, copy;
+ time_t x;
+ usec_t x_usec, plus = 0, minus = 0, ret;
+ int r, weekday = -1, dst = -1;
+ size_t i;
+
+ /* Allowed syntaxes:
+ *
+ * 2012-09-22 16:34:22
+ * 2012-09-22 16:34 (seconds will be set to 0)
+ * 2012-09-22 (time will be set to 00:00:00)
+ * 16:34:22 (date will be set to today)
+ * 16:34 (date will be set to today, seconds to 0)
+ * now
+ * yesterday (time is set to 00:00:00)
+ * today (time is set to 00:00:00)
+ * tomorrow (time is set to 00:00:00)
+ * +5min
+ * -5days
+ * @2147483647 (seconds since epoch)
+ */
+
+ assert(t);
+ assert(usec);
+
+ if (t[0] == '@' && !with_tz)
+ return parse_sec(t + 1, usec);
+
+ ret = now(CLOCK_REALTIME);
+
+ if (!with_tz) {
+ if (streq(t, "now"))
+ goto finish;
+
+ else if (t[0] == '+') {
+ r = parse_sec(t+1, &plus);
+ if (r < 0)
+ return r;
+
+ goto finish;
+
+ } else if (t[0] == '-') {
+ r = parse_sec(t+1, &minus);
+ if (r < 0)
+ return r;
+
+ goto finish;
+
+ } else if ((k = endswith(t, " ago"))) {
+ t = strndupa(t, k - t);
+
+ r = parse_sec(t, &minus);
+ if (r < 0)
+ return r;
+
+ goto finish;
+
+ } else if ((k = endswith(t, " left"))) {
+ t = strndupa(t, k - t);
+
+ r = parse_sec(t, &plus);
+ if (r < 0)
+ return r;
+
+ 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 = (time_t) (ret / USEC_PER_SEC);
+ x_usec = 0;
+
+ if (!localtime_or_gmtime_r(&x, &tm, utc))
+ return -EINVAL;
+
+ tm.tm_isdst = dst;
+ if (!with_tz && 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_sec = tm.tm_min = tm.tm_hour = 0;
+ goto from_tm;
+
+ } else if (streq(t, "tomorrow")) {
+ 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;
+
+ if (!startswith_no_case(t, day_nr[i].name))
+ continue;
+
+ skip = strlen(day_nr[i].name);
+ if (t[skip] != ' ')
+ continue;
+
+ weekday = day_nr[i].nr;
+ t += skip + 1;
+ break;
+ }
+
+ copy = tm;
+ k = strptime(t, "%y-%m-%d %H:%M:%S", &tm);
+ if (k) {
+ if (*k == '.')
+ goto parse_usec;
+ else if (*k == 0)
+ goto from_tm;
+ }
+
+ tm = copy;
+ k = strptime(t, "%Y-%m-%d %H:%M:%S", &tm);
+ if (k) {
+ if (*k == '.')
+ goto parse_usec;
+ else if (*k == 0)
+ goto from_tm;
+ }
+
+ tm = copy;
+ k = strptime(t, "%y-%m-%d %H:%M", &tm);
+ if (k && *k == 0) {
+ tm.tm_sec = 0;
+ goto from_tm;
+ }
+
+ tm = copy;
+ k = strptime(t, "%Y-%m-%d %H:%M", &tm);
+ if (k && *k == 0) {
+ tm.tm_sec = 0;
+ goto from_tm;
+ }
+
+ tm = copy;
+ k = strptime(t, "%y-%m-%d", &tm);
+ if (k && *k == 0) {
+ tm.tm_sec = tm.tm_min = tm.tm_hour = 0;
+ goto from_tm;
+ }
+
+ tm = copy;
+ k = strptime(t, "%Y-%m-%d", &tm);
+ if (k && *k == 0) {
+ tm.tm_sec = tm.tm_min = tm.tm_hour = 0;
+ goto from_tm;
+ }
+
+ tm = copy;
+ k = strptime(t, "%H:%M:%S", &tm);
+ if (k) {
+ if (*k == '.')
+ goto parse_usec;
+ else if (*k == 0)
+ goto from_tm;
+ }
+
+ tm = copy;
+ k = strptime(t, "%H:%M", &tm);
+ if (k && *k == 0) {
+ tm.tm_sec = 0;
+ goto from_tm;
+ }
+
+ return -EINVAL;
+
+parse_usec:
+ {
+ unsigned add;
+
+ k++;
+ r = parse_fractional_part_u(&k, 6, &add);
+ if (r < 0)
+ return -EINVAL;
+
+ if (*k)
+ return -EINVAL;
+
+ x_usec = add;
+ }
+
+from_tm:
+ if (weekday >= 0 && tm.tm_wday != weekday)
+ return -EINVAL;
+
+ x = mktime_or_timegm(&tm, utc);
+ if (x < 0)
+ 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 > USEC_TIMESTAMP_FORMATTABLE_MAX)
+ return -EINVAL;
+
+ if (ret >= minus)
+ ret -= minus;
+ else
+ return -EINVAL;
+
+ *usec = ret;
+
+ return 0;
+}
+
+typedef struct ParseTimestampResult {
+ usec_t usec;
+ int return_value;
+} ParseTimestampResult;
+
+int parse_timestamp(const char *t, usec_t *usec) {
+ char *last_space, *tz = NULL;
+ ParseTimestampResult *shared, tmp;
+ int r;
+
+ last_space = strrchr(t, ' ');
+ if (last_space != NULL && timezone_is_valid(last_space + 1, LOG_DEBUG))
+ tz = last_space + 1;
+
+ if (!tz || endswith_no_case(t, " UTC"))
+ return parse_timestamp_impl(t, usec, false);
+
+ shared = mmap(NULL, sizeof *shared, PROT_READ|PROT_WRITE, MAP_SHARED|MAP_ANONYMOUS, -1, 0);
+ if (shared == MAP_FAILED)
+ return negative_errno();
+
+ r = safe_fork("(sd-timestamp)", FORK_RESET_SIGNALS|FORK_CLOSE_ALL_FDS|FORK_DEATHSIG|FORK_WAIT, NULL);
+ if (r < 0) {
+ (void) munmap(shared, sizeof *shared);
+ return r;
+ }
+ if (r == 0) {
+ bool with_tz = true;
+
+ if (setenv("TZ", tz, 1) != 0) {
+ shared->return_value = negative_errno();
+ _exit(EXIT_FAILURE);
+ }
+
+ tzset();
+
+ /* If there is a timezone that matches the tzname fields, leave the parsing to the implementation.
+ * Otherwise just cut it off. */
+ with_tz = !STR_IN_SET(tz, tzname[0], tzname[1]);
+
+ /* Cut off the timezone if we don't need it. */
+ if (with_tz)
+ t = strndupa(t, last_space - t);
+
+ shared->return_value = parse_timestamp_impl(t, &shared->usec, with_tz);
+
+ _exit(EXIT_SUCCESS);
+ }
+
+ tmp = *shared;
+ if (munmap(shared, sizeof *shared) != 0)
+ return negative_errno();
+
+ if (tmp.return_value == 0)
+ *usec = tmp.usec;
+
+ return tmp.return_value;
+}
+
+static const char* extract_multiplier(const 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 },
+ { "minutes", USEC_PER_MINUTE },
+ { "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 },
+ { "µs", 1ULL },
+ };
+ size_t 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;
+
+ assert(t);
+ assert(usec);
+ assert(default_unit > 0);
+
+ p = t;
+
+ p += strspn(p, WHITESPACE);
+ s = startswith(p, "infinity");
+ if (s) {
+ s += strspn(s, WHITESPACE);
+ if (*s != 0)
+ return -EINVAL;
+
+ *usec = USEC_INFINITY;
+ return 0;
+ }
+
+ for (;;) {
+ usec_t multiplier = default_unit, k;
+ long long l;
+ char *e;
+
+ p += strspn(p, WHITESPACE);
+
+ if (*p == 0) {
+ if (!something)
+ return -EINVAL;
+
+ break;
+ }
+
+ if (*p == '-') /* Don't allow "-0" */
+ return -ERANGE;
+
+ errno = 0;
+ l = strtoll(p, &e, 10);
+ if (errno > 0)
+ return -errno;
+ if (l < 0)
+ return -ERANGE;
+
+ if (*e == '.') {
+ p = e + 1;
+ p += strspn(p, DIGITS);
+ } else if (e == p)
+ return -EINVAL;
+ else
+ p = e;
+
+ s = extract_multiplier(p + strspn(p, WHITESPACE), &multiplier);
+ if (s == p && *s != '\0')
+ /* Don't allow '12.34.56', but accept '12.34 .56' or '12.34s.56'*/
+ return -EINVAL;
+
+ p = s;
+
+ if ((usec_t) l >= USEC_INFINITY / multiplier)
+ return -ERANGE;
+
+ k = (usec_t) l * multiplier;
+ if (k >= USEC_INFINITY - r)
+ return -ERANGE;
+
+ r += k;
+
+ something = true;
+
+ if (*e == '.') {
+ usec_t m = multiplier / 10;
+ const char *b;
+
+ for (b = e + 1; *b >= '0' && *b <= '9'; b++, m /= 10) {
+ k = (usec_t) (*b - '0') * m;
+ if (k >= USEC_INFINITY - r)
+ return -ERANGE;
+
+ r += k;
+ }
+
+ /* Don't allow "0.-0", "3.+1", "3. 1", "3.sec" or "3.hoge"*/
+ if (b == e + 1)
+ return -EINVAL;
+ }
+ }
+
+ *usec = r;
+
+ return 0;
+}
+
+int parse_sec(const char *t, usec_t *usec) {
+ return parse_time(t, usec, USEC_PER_SEC);
+}
+
+int parse_sec_fix_0(const char *t, usec_t *ret) {
+ usec_t k;
+ int r;
+
+ assert(t);
+ assert(ret);
+
+ r = parse_sec(t, &k);
+ if (r < 0)
+ return r;
+
+ *ret = k == 0 ? USEC_INFINITY : k;
+ return r;
+}
+
+static const char* extract_nsec_multiplier(const char *p, nsec_t *multiplier) {
+ static const struct {
+ const char *suffix;
+ nsec_t nsec;
+ } table[] = {
+ { "seconds", NSEC_PER_SEC },
+ { "second", NSEC_PER_SEC },
+ { "sec", NSEC_PER_SEC },
+ { "s", NSEC_PER_SEC },
+ { "minutes", NSEC_PER_MINUTE },
+ { "minute", NSEC_PER_MINUTE },
+ { "min", NSEC_PER_MINUTE },
+ { "months", NSEC_PER_MONTH },
+ { "month", NSEC_PER_MONTH },
+ { "M", NSEC_PER_MONTH },
+ { "msec", NSEC_PER_MSEC },
+ { "ms", NSEC_PER_MSEC },
+ { "m", NSEC_PER_MINUTE },
+ { "hours", NSEC_PER_HOUR },
+ { "hour", NSEC_PER_HOUR },
+ { "hr", NSEC_PER_HOUR },
+ { "h", NSEC_PER_HOUR },
+ { "days", NSEC_PER_DAY },
+ { "day", NSEC_PER_DAY },
+ { "d", NSEC_PER_DAY },
+ { "weeks", NSEC_PER_WEEK },
+ { "week", NSEC_PER_WEEK },
+ { "w", NSEC_PER_WEEK },
+ { "years", NSEC_PER_YEAR },
+ { "year", NSEC_PER_YEAR },
+ { "y", NSEC_PER_YEAR },
+ { "usec", NSEC_PER_USEC },
+ { "us", NSEC_PER_USEC },
+ { "µs", NSEC_PER_USEC },
+ { "nsec", 1ULL },
+ { "ns", 1ULL },
+ { "", 1ULL }, /* default is nsec */
+ };
+ size_t i;
+
+ for (i = 0; i < ELEMENTSOF(table); i++) {
+ char *e;
+
+ e = startswith(p, table[i].suffix);
+ if (e) {
+ *multiplier = table[i].nsec;
+ return e;
+ }
+ }
+
+ return p;
+}
+
+int parse_nsec(const char *t, nsec_t *nsec) {
+ const char *p, *s;
+ nsec_t r = 0;
+ bool something = false;
+
+ assert(t);
+ assert(nsec);
+
+ p = t;
+
+ p += strspn(p, WHITESPACE);
+ s = startswith(p, "infinity");
+ if (s) {
+ s += strspn(s, WHITESPACE);
+ if (*s != 0)
+ return -EINVAL;
+
+ *nsec = NSEC_INFINITY;
+ return 0;
+ }
+
+ for (;;) {
+ nsec_t multiplier = 1, k;
+ long long l;
+ char *e;
+
+ p += strspn(p, WHITESPACE);
+
+ if (*p == 0) {
+ if (!something)
+ return -EINVAL;
+
+ break;
+ }
+
+ if (*p == '-') /* Don't allow "-0" */
+ return -ERANGE;
+
+ errno = 0;
+ l = strtoll(p, &e, 10);
+ if (errno > 0)
+ return -errno;
+ if (l < 0)
+ return -ERANGE;
+
+ if (*e == '.') {
+ p = e + 1;
+ p += strspn(p, DIGITS);
+ } else if (e == p)
+ return -EINVAL;
+ else
+ p = e;
+
+ s = extract_nsec_multiplier(p + strspn(p, WHITESPACE), &multiplier);
+ if (s == p && *s != '\0')
+ /* Don't allow '12.34.56', but accept '12.34 .56' or '12.34s.56'*/
+ return -EINVAL;
+
+ p = s;
+
+ if ((nsec_t) l >= NSEC_INFINITY / multiplier)
+ return -ERANGE;
+
+ k = (nsec_t) l * multiplier;
+ if (k >= NSEC_INFINITY - r)
+ return -ERANGE;
+
+ r += k;
+
+ something = true;
+
+ if (*e == '.') {
+ nsec_t m = multiplier / 10;
+ const char *b;
+
+ for (b = e + 1; *b >= '0' && *b <= '9'; b++, m /= 10) {
+ k = (nsec_t) (*b - '0') * m;
+ if (k >= NSEC_INFINITY - r)
+ return -ERANGE;
+
+ r += k;
+ }
+
+ /* Don't allow "0.-0", "3.+1", "3. 1", "3.sec" or "3.hoge"*/
+ if (b == e + 1)
+ return -EINVAL;
+ }
+ }
+
+ *nsec = r;
+
+ return 0;
+}
+
+bool ntp_synced(void) {
+ struct timex txc = {};
+
+ if (adjtimex(&txc) < 0)
+ return false;
+
+ if (txc.status & STA_UNSYNC)
+ return false;
+
+ return true;
+}
+
+int get_timezones(char ***ret) {
+ _cleanup_fclose_ FILE *f = NULL;
+ _cleanup_strv_free_ char **zones = NULL;
+ size_t n_zones = 0, n_allocated = 0;
+ int r;
+
+ assert(ret);
+
+ zones = strv_new("UTC");
+ if (!zones)
+ return -ENOMEM;
+
+ n_allocated = 2;
+ n_zones = 1;
+
+ f = fopen("/usr/share/zoneinfo/zone.tab", "re");
+ if (f) {
+ for (;;) {
+ _cleanup_free_ char *line = NULL;
+ char *p, *w;
+ size_t k;
+
+ r = read_line(f, LONG_LINE_MAX, &line);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ break;
+
+ p = strstrip(line);
+
+ if (isempty(p) || *p == '#')
+ continue;
+
+ /* Skip over country code */
+ p += strcspn(p, WHITESPACE);
+ p += strspn(p, WHITESPACE);
+
+ /* Skip over coordinates */
+ p += strcspn(p, WHITESPACE);
+ p += strspn(p, WHITESPACE);
+
+ /* Found timezone name */
+ k = strcspn(p, WHITESPACE);
+ if (k <= 0)
+ continue;
+
+ w = strndup(p, k);
+ if (!w)
+ return -ENOMEM;
+
+ if (!GREEDY_REALLOC(zones, n_allocated, n_zones + 2)) {
+ free(w);
+ return -ENOMEM;
+ }
+
+ zones[n_zones++] = w;
+ zones[n_zones] = NULL;
+ }
+
+ strv_sort(zones);
+
+ } else if (errno != ENOENT)
+ return -errno;
+
+ *ret = TAKE_PTR(zones);
+
+ return 0;
+}
+
+bool timezone_is_valid(const char *name, int log_level) {
+ bool slash = false;
+ const char *p, *t;
+ _cleanup_close_ int fd = -1;
+ char buf[4];
+ int r;
+
+ if (isempty(name))
+ return false;
+
+ if (name[0] == '/')
+ return false;
+
+ for (p = name; *p; p++) {
+ if (!(*p >= '0' && *p <= '9') &&
+ !(*p >= 'a' && *p <= 'z') &&
+ !(*p >= 'A' && *p <= 'Z') &&
+ !IN_SET(*p, '-', '_', '+', '/'))
+ return false;
+
+ if (*p == '/') {
+
+ if (slash)
+ return false;
+
+ slash = true;
+ } else
+ slash = false;
+ }
+
+ if (slash)
+ return false;
+
+ if (p - name >= PATH_MAX)
+ return false;
+
+ t = strjoina("/usr/share/zoneinfo/", name);
+
+ fd = open(t, O_RDONLY|O_CLOEXEC);
+ if (fd < 0) {
+ log_full_errno(log_level, errno, "Failed to open timezone file '%s': %m", t);
+ return false;
+ }
+
+ r = fd_verify_regular(fd);
+ if (r < 0) {
+ log_full_errno(log_level, r, "Timezone file '%s' is not a regular file: %m", t);
+ return false;
+ }
+
+ r = loop_read_exact(fd, buf, 4, false);
+ if (r < 0) {
+ log_full_errno(log_level, r, "Failed to read from timezone file '%s': %m", t);
+ return false;
+ }
+
+ /* Magic from tzfile(5) */
+ if (memcmp(buf, "TZif", 4) != 0) {
+ log_full(log_level, "Timezone file '%s' has wrong magic bytes", t);
+ return false;
+ }
+
+ return true;
+}
+
+bool clock_boottime_supported(void) {
+ static int supported = -1;
+
+ /* Note that this checks whether CLOCK_BOOTTIME is available in general as well as available for timerfds()! */
+
+ 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 supported;
+}
+
+clockid_t clock_boottime_or_monotonic(void) {
+ if (clock_boottime_supported())
+ return CLOCK_BOOTTIME;
+ else
+ 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;
+
+ _fallthrough_;
+ 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;
+ char *z;
+ int r;
+
+ r = readlink_malloc("/etc/localtime", &t);
+ if (r < 0)
+ return r; /* returns EINVAL if not a symlink */
+
+ e = PATH_STARTSWITH_SET(t, "/usr/share/zoneinfo/", "../usr/share/zoneinfo/");
+ if (!e)
+ return -EINVAL;
+
+ if (!timezone_is_valid(e, LOG_DEBUG))
+ return -EINVAL;
+
+ z = strdup(e);
+ if (!z)
+ return -ENOMEM;
+
+ *tz = z;
+ return 0;
+}
+
+time_t mktime_or_timegm(struct tm *tm, bool utc) {
+ return utc ? timegm(tm) : mktime(tm);
+}
+
+struct tm *localtime_or_gmtime_r(const time_t *t, struct tm *tm, bool utc) {
+ return utc ? gmtime_r(t, tm) : localtime_r(t, tm);
+}
+
+unsigned long usec_to_jiffies(usec_t u) {
+ static thread_local unsigned long hz = 0;
+ long r;
+
+ if (hz == 0) {
+ r = sysconf(_SC_CLK_TCK);
+
+ assert(r > 0);
+ 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));
+}
+
+bool in_utc_timezone(void) {
+ tzset();
+
+ return timezone == 0 && daylight == 0;
+}
+
+int time_change_fd(void) {
+
+ /* We only care for the cancellation event, hence we set the timeout to the latest possible value. */
+ static const struct itimerspec its = {
+ .it_value.tv_sec = TIME_T_MAX,
+ };
+
+ _cleanup_close_ int fd;
+
+ assert_cc(sizeof(time_t) == sizeof(TIME_T_MAX));
+
+ /* Uses TFD_TIMER_CANCEL_ON_SET to get notifications whenever CLOCK_REALTIME makes a jump relative to
+ * CLOCK_MONOTONIC. */
+
+ fd = timerfd_create(CLOCK_REALTIME, TFD_NONBLOCK|TFD_CLOEXEC);
+ if (fd < 0)
+ return -errno;
+
+ if (timerfd_settime(fd, TFD_TIMER_ABSTIME|TFD_TIMER_CANCEL_ON_SET, &its, NULL) < 0)
+ return -errno;
+
+ return TAKE_FD(fd);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-23 03:02:26 +0000