time-util: introduce deserialize_timestamp_value()

[elogind.git] / src / basic / time-util.c

diff --git a/src/basic/time-util.c b/src/basic/time-util.c
index 17d3da6fa296c5821300f2767907375f9dc201fb..4c811d41f448a1f312e0105db8d1f40c012f2b1a 100644 (file)
--- a/src/basic/time-util.c
+++ b/src/basic/time-util.c
@@ -1,5 +1,3 @@
-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-

 /***
   This file is part of systemd.
 
 /***
   This file is part of systemd.
 


@@ -19,15 +17,32 @@
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 ***/
 
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 ***/
 

-#include <time.h>
+#include <errno.h>
+#include <limits.h>
+#include <stdlib.h>

 #include <string.h>
 #include <string.h>

-#include <sys/timex.h>
+#include <sys/stat.h>
+#include <sys/time.h>

 #include <sys/timerfd.h>
 #include <sys/timerfd.h>

-
-#include "util.h"
-#include "time-util.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 "log.h"
+#include "macro.h"
+#include "parse-util.h"

 #include "path-util.h"
 #include "path-util.h"

+#include "string-util.h"

 #include "strv.h"
 #include "strv.h"

+#include "time-util.h"
+
+#if 0 /// UNNEEDED by elogind
+static nsec_t timespec_load_nsec(const struct timespec *ts);
+#endif // 0

 
 usec_t now(clockid_t clock_id) {
         struct timespec ts;
 
 usec_t now(clockid_t clock_id) {
         struct timespec ts;


@@ -37,8 +52,7 @@ usec_t now(clockid_t clock_id) {
         return timespec_load(&ts);
 }
 
         return timespec_load(&ts);
 }
 

-/// UNNEEDED by elogind
-#if 0
+#if 0 /// UNNEEDED by elogind

 nsec_t now_nsec(clockid_t clock_id) {
         struct timespec ts;
 
 nsec_t now_nsec(clockid_t clock_id) {
         struct timespec ts;
 


@@ -69,18 +83,12 @@ 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->realtime = u;
 
         delta = (int64_t) now(CLOCK_REALTIME) - (int64_t) u;

-        ts->monotonic = now(CLOCK_MONOTONIC);
-
-        if ((int64_t) ts->monotonic > delta)
-                ts->monotonic -= delta;
-        else
-                ts->monotonic = 0;
+        ts->monotonic = usec_sub(now(CLOCK_MONOTONIC), delta);

 
         return ts;
 }
 
 
         return ts;
 }
 

-/// UNNEEDED by elogind
-#if 0
+#if 0 /// UNNEEDED by elogind

 dual_timestamp* dual_timestamp_from_monotonic(dual_timestamp *ts, usec_t u) {
         int64_t delta;
         assert(ts);
 dual_timestamp* dual_timestamp_from_monotonic(dual_timestamp *ts, usec_t u) {
         int64_t delta;
         assert(ts);


@@ -92,12 +100,7 @@ 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->monotonic = u;
         delta = (int64_t) now(CLOCK_MONOTONIC) - (int64_t) u;

-
-        ts->realtime = now(CLOCK_REALTIME);
-        if ((int64_t) ts->realtime > delta)
-                ts->realtime -= delta;
-        else
-                ts->realtime = 0;
+        ts->realtime = usec_sub(now(CLOCK_REALTIME), delta);

 
         return ts;
 }
 
         return ts;
 }


@@ -109,20 +112,11 @@ dual_timestamp* dual_timestamp_from_boottime_or_monotonic(dual_timestamp *ts, us
                 ts->realtime = ts->monotonic = USEC_INFINITY;
                 return ts;
         }
                 ts->realtime = ts->monotonic = USEC_INFINITY;
                 return ts;
         }

-        ts->realtime = now(CLOCK_REALTIME);
-        ts->monotonic = now(CLOCK_MONOTONIC);

 
 

+        dual_timestamp_get(ts);

         delta = (int64_t) now(clock_boottime_or_monotonic()) - (int64_t) u;
         delta = (int64_t) now(clock_boottime_or_monotonic()) - (int64_t) u;

-
-        if ((int64_t) ts->realtime > delta)
-                ts->realtime -= delta;
-        else
-                ts->realtime = 0;
-
-        if ((int64_t) ts->monotonic > delta)
-                ts->monotonic -= delta;
-        else
-                ts->monotonic = 0;
+        ts->realtime = usec_sub(ts->realtime, delta);
+        ts->monotonic = usec_sub(ts->monotonic, delta);

 
         return ts;
 }
 
         return ts;
 }


@@ -143,7 +137,8 @@ usec_t timespec_load(const struct timespec *ts) {
                 (usec_t) ts->tv_nsec / NSEC_PER_USEC;
 }
 
                 (usec_t) ts->tv_nsec / NSEC_PER_USEC;
 }
 

-nsec_t timespec_load_nsec(const struct timespec *ts) {
+#if 0 /// UNNEEDED by elogind
+static nsec_t timespec_load_nsec(const struct timespec *ts) {

         assert(ts);
 
         if (ts->tv_sec == (time_t) -1 &&
         assert(ts);
 
         if (ts->tv_sec == (time_t) -1 &&


@@ -154,6 +149,7 @@ nsec_t timespec_load_nsec(const struct timespec *ts) {
                 (nsec_t) ts->tv_sec * NSEC_PER_SEC +
                 (nsec_t) ts->tv_nsec;
 }
                 (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);
 
 struct timespec *timespec_store(struct timespec *ts, usec_t u)  {
         assert(ts);


@@ -199,9 +195,11 @@ struct timeval *timeval_store(struct timeval *tv, usec_t u) {
         return tv;
 }
 
         return tv;
 }
 

-static char *format_timestamp_internal(char *buf, size_t l, usec_t t, bool utc) {
+static char *format_timestamp_internal(char *buf, size_t l, usec_t t,
+                                       bool utc, bool us) {

         struct tm tm;
         time_t sec;
         struct tm tm;
         time_t sec;

+        int k;

 
         assert(buf);
         assert(l > 0);
 
         assert(buf);
         assert(l > 0);


@@ -210,61 +208,41 @@ static char *format_timestamp_internal(char *buf, size_t l, usec_t t, bool utc)
                 return NULL;
 
         sec = (time_t) (t / USEC_PER_SEC);
                 return NULL;
 
         sec = (time_t) (t / USEC_PER_SEC);

+        localtime_or_gmtime_r(&sec, &tm, utc);

 
 

-        if (utc)
-                gmtime_r(&sec, &tm);
+        if (us)
+                k = strftime(buf, l, "%a %Y-%m-%d %H:%M:%S", &tm);

         else
         else

-                localtime_r(&sec, &tm);
-        if (strftime(buf, l, "%a %Y-%m-%d %H:%M:%S %Z", &tm) <= 0)
+                k = strftime(buf, l, "%a %Y-%m-%d %H:%M:%S %Z", &tm);
+
+        if (k <= 0)

                 return NULL;
                 return NULL;

+        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;
+        }

 
         return buf;
 }
 
 char *format_timestamp(char *buf, size_t l, usec_t t) {
 
         return buf;
 }
 
 char *format_timestamp(char *buf, size_t l, usec_t t) {

-        return format_timestamp_internal(buf, l, t, false);
+        return format_timestamp_internal(buf, l, t, false, false);

 }
 
 }
 

-/// UNNEEDED by elogind
-#if 0
+#if 0 /// UNNEEDED by elogind

 char *format_timestamp_utc(char *buf, size_t l, usec_t t) {
 char *format_timestamp_utc(char *buf, size_t l, usec_t t) {

-        return format_timestamp_internal(buf, l, t, true);
+        return format_timestamp_internal(buf, l, t, true, false);

 }
 #endif // 0
 
 }
 #endif // 0
 

-static char *format_timestamp_internal_us(char *buf, size_t l, usec_t t, bool utc) {
-        struct tm tm;
-        time_t sec;
-
-        assert(buf);
-        assert(l > 0);
-
-        if (t <= 0 || t == USEC_INFINITY)
-                return NULL;
-
-        sec = (time_t) (t / USEC_PER_SEC);
-        if (utc)
-                gmtime_r(&sec, &tm);
-        else
-                localtime_r(&sec, &tm);
-
-        if (strftime(buf, l, "%a %Y-%m-%d %H:%M:%S", &tm) <= 0)
-                return NULL;
-        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;
-
-        return buf;
-}
-

 char *format_timestamp_us(char *buf, size_t l, usec_t t) {
 char *format_timestamp_us(char *buf, size_t l, usec_t t) {

-        return format_timestamp_internal_us(buf, l, t, false);
+        return format_timestamp_internal(buf, l, t, false, true);

 }
 
 }
 

-/// UNNEEDED by elogind
-#if 0
+#if 0 /// UNNEEDED by elogind

 char *format_timestamp_us_utc(char *buf, size_t l, usec_t t) {
 char *format_timestamp_us_utc(char *buf, size_t l, usec_t t) {

-        return format_timestamp_internal_us(buf, l, t, true);
+        return format_timestamp_internal(buf, l, t, true, true);

 }
 #endif // 0
 
 }
 #endif // 0
 


@@ -441,8 +419,7 @@ char *format_timespan(char *buf, size_t l, usec_t t, usec_t accuracy) {
         return buf;
 }
 
         return buf;
 }
 

-/// UNNEEDED by elogind
-#if 0
+#if 0 /// UNNEEDED by elogind

 void dual_timestamp_serialize(FILE *f, const char *name, dual_timestamp *t) {
 
         assert(f);
 void dual_timestamp_serialize(FILE *f, const char *name, dual_timestamp *t) {
 
         assert(f);


@@ -475,6 +452,19 @@ int dual_timestamp_deserialize(const char *value, dual_timestamp *t) {
         return 0;
 }
 
         return 0;
 }
 

+int deserialize_timestamp_value(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 r;
+}
+

 int parse_timestamp(const char *t, usec_t *usec) {
         static const struct {
                 const char *name;
 int parse_timestamp(const char *t, usec_t *usec) {
         static const struct {
                 const char *name;


@@ -497,9 +487,10 @@ int parse_timestamp(const char *t, usec_t *usec) {
         };
 
         const char *k;
         };
 
         const char *k;

+        const char *utc;

         struct tm tm, copy;
         time_t x;
         struct tm tm, copy;
         time_t x;

-        usec_t plus = 0, minus = 0, ret;
+        usec_t x_usec, plus = 0, minus = 0, ret;

         int r, weekday = -1;
         unsigned i;
 
         int r, weekday = -1;
         unsigned i;
 


@@ -524,28 +515,15 @@ int parse_timestamp(const char *t, usec_t *usec) {
         assert(t);
         assert(usec);
 
         assert(t);
         assert(usec);
 

-        x = time(NULL);
-        assert_se(localtime_r(&x, &tm));
-        tm.tm_isdst = -1;
+        if (t[0] == '@')
+                return parse_sec(t + 1, usec);

 
 

-        if (streq(t, "now"))
-                goto finish;
+        ret = now(CLOCK_REALTIME);

 
 

-        else if (streq(t, "today")) {
-                tm.tm_sec = tm.tm_min = tm.tm_hour = 0;
-                goto finish;
-
-        } else if (streq(t, "yesterday")) {
-                tm.tm_mday --;
-                tm.tm_sec = tm.tm_min = tm.tm_hour = 0;
-                goto finish;
-
-        } else if (streq(t, "tomorrow")) {
-                tm.tm_mday ++;
-                tm.tm_sec = tm.tm_min = tm.tm_hour = 0;
+        if (streq(t, "now"))

                 goto finish;
 
                 goto finish;
 

-        } else if (t[0] == '+') {
+        else if (t[0] == '+') {

                 r = parse_sec(t+1, &plus);
                 if (r < 0)
                         return r;
                 r = parse_sec(t+1, &plus);
                 if (r < 0)
                         return r;


@@ -559,35 +537,51 @@ int parse_timestamp(const char *t, usec_t *usec) {
 
                 goto finish;
 
 
                 goto finish;
 

-        } else if (t[0] == '@')
-                return parse_sec(t + 1, usec);
-
-        else if (endswith(t, " ago")) {
-                _cleanup_free_ char *z;
+        } else if ((k = endswith(t, " ago"))) {
+                t = strndupa(t, k - t);

 
 

-                z = strndup(t, strlen(t) - 4);
-                if (!z)
-                        return -ENOMEM;
-
-                r = parse_sec(z, &minus);
+                r = parse_sec(t, &minus);

                 if (r < 0)
                         return r;
 
                 goto finish;
                 if (r < 0)
                         return r;
 
                 goto finish;

-        } else if (endswith(t, " left")) {
-                _cleanup_free_ char *z;

 
 

-                z = strndup(t, strlen(t) - 4);
-                if (!z)
-                        return -ENOMEM;
+        } else if ((k = endswith(t, " left"))) {
+                t = strndupa(t, k - t);

 
 

-                r = parse_sec(z, &plus);
+                r = parse_sec(t, &plus);

                 if (r < 0)
                         return r;
 
                 goto finish;
         }
 
                 if (r < 0)
                         return r;
 
                 goto finish;
         }
 

+        utc = endswith_no_case(t, " UTC");
+        if (utc)
+                t = strndupa(t, utc - t);
+
+        x = ret / USEC_PER_SEC;
+        x_usec = 0;
+
+        assert_se(localtime_or_gmtime_r(&x, &tm, utc));
+        tm.tm_isdst = -1;
+
+        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;
 
         for (i = 0; i < ELEMENTSOF(day_nr); i++) {
                 size_t skip;
 


@@ -605,66 +599,95 @@ int parse_timestamp(const char *t, usec_t *usec) {
 
         copy = tm;
         k = strptime(t, "%y-%m-%d %H:%M:%S", &tm);
 
         copy = tm;
         k = strptime(t, "%y-%m-%d %H:%M:%S", &tm);

-        if (k && *k == 0)
-                goto finish;
+        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);
 
         tm = copy;
         k = strptime(t, "%Y-%m-%d %H:%M:%S", &tm);

-        if (k && *k == 0)
-                goto finish;
+        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;
 
         tm = copy;
         k = strptime(t, "%y-%m-%d %H:%M", &tm);
         if (k && *k == 0) {
                 tm.tm_sec = 0;

-                goto finish;
+                goto from_tm;

         }
 
         tm = copy;
         k = strptime(t, "%Y-%m-%d %H:%M", &tm);
         if (k && *k == 0) {
                 tm.tm_sec = 0;
         }
 
         tm = copy;
         k = strptime(t, "%Y-%m-%d %H:%M", &tm);
         if (k && *k == 0) {
                 tm.tm_sec = 0;

-                goto finish;
+                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;
         }
 
         tm = copy;
         k = strptime(t, "%y-%m-%d", &tm);
         if (k && *k == 0) {
                 tm.tm_sec = tm.tm_min = tm.tm_hour = 0;

-                goto finish;
+                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;
         }
 
         tm = copy;
         k = strptime(t, "%Y-%m-%d", &tm);
         if (k && *k == 0) {
                 tm.tm_sec = tm.tm_min = tm.tm_hour = 0;

-                goto finish;
+                goto from_tm;

         }
 
         tm = copy;
         k = strptime(t, "%H:%M:%S", &tm);
         }
 
         tm = copy;
         k = strptime(t, "%H:%M:%S", &tm);

-        if (k && *k == 0)
-                goto finish;
+        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;
 
         tm = copy;
         k = strptime(t, "%H:%M", &tm);
         if (k && *k == 0) {
                 tm.tm_sec = 0;

-                goto finish;
+                goto from_tm;

         }
 
         return -EINVAL;
 
         }
 
         return -EINVAL;
 

-finish:
-        x = mktime(&tm);
+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:
+        x = mktime_or_timegm(&tm, utc);

         if (x == (time_t) -1)
                 return -EINVAL;
 
         if (weekday >= 0 && tm.tm_wday != weekday)
                 return -EINVAL;
 
         if (x == (time_t) -1)
                 return -EINVAL;
 
         if (weekday >= 0 && tm.tm_wday != weekday)
                 return -EINVAL;
 

-        ret = (usec_t) x * USEC_PER_SEC;
+        ret = (usec_t) x * USEC_PER_SEC + x_usec;

 
 

+finish:

         ret += plus;
         if (ret > minus)
                 ret -= minus;
         ret += plus;
         if (ret > minus)
                 ret -= minus;


@@ -677,7 +700,8 @@ finish:
 }
 #endif // 0
 
 }
 #endif // 0
 

-int parse_sec(const char *t, usec_t *usec) {
+int parse_time(const char *t, usec_t *usec, usec_t default_unit) {
+

         static const struct {
                 const char *suffix;
                 usec_t usec;
         static const struct {
                 const char *suffix;
                 usec_t usec;


@@ -691,6 +715,7 @@ int parse_sec(const char *t, usec_t *usec) {
                 { "min", USEC_PER_MINUTE },
                 { "months", USEC_PER_MONTH },
                 { "month", USEC_PER_MONTH },
                 { "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 },
                 { "msec", USEC_PER_MSEC },
                 { "ms", USEC_PER_MSEC },
                 { "m", USEC_PER_MINUTE },


@@ -709,7 +734,6 @@ int parse_sec(const char *t, usec_t *usec) {
                 { "y", USEC_PER_YEAR },
                 { "usec", 1ULL },
                 { "us", 1ULL },
                 { "y", USEC_PER_YEAR },
                 { "usec", 1ULL },
                 { "us", 1ULL },

-                { "", USEC_PER_SEC }, /* default is sec */

         };
 
         const char *p, *s;
         };
 
         const char *p, *s;


@@ -718,6 +742,7 @@ int parse_sec(const char *t, usec_t *usec) {
 
         assert(t);
         assert(usec);
 
         assert(t);
         assert(usec);

+        assert(default_unit > 0);

 
         p = t;
 
 
         p = t;
 


@@ -736,6 +761,7 @@ int parse_sec(const char *t, usec_t *usec) {
                 long long l, z = 0;
                 char *e;
                 unsigned i, n = 0;
                 long long l, z = 0;
                 char *e;
                 unsigned i, n = 0;

+                usec_t multiplier, k;

 
                 p += strspn(p, WHITESPACE);
 
 
                 p += strspn(p, WHITESPACE);
 


@@ -778,21 +804,24 @@ int parse_sec(const char *t, usec_t *usec) {
 
                 for (i = 0; i < ELEMENTSOF(table); i++)
                         if (startswith(e, table[i].suffix)) {
 
                 for (i = 0; i < ELEMENTSOF(table); i++)
                         if (startswith(e, table[i].suffix)) {

-                                usec_t k = (usec_t) z * table[i].usec;
-
-                                for (; n > 0; n--)
-                                        k /= 10;
-
-                                r += (usec_t) l * table[i].usec + k;
+                                multiplier = table[i].usec;

                                 p = e + strlen(table[i].suffix);
                                 p = e + strlen(table[i].suffix);

-
-                                something = true;

                                 break;
                         }
 
                                 break;
                         }
 

-                if (i >= ELEMENTSOF(table))
-                        return -EINVAL;
+                if (i >= ELEMENTSOF(table)) {
+                        multiplier = default_unit;
+                        p = e;
+                }
+
+                something = true;
+
+                k = (usec_t) z * multiplier;
+
+                for (; n > 0; n--)
+                        k /= 10;

 
 

+                r += (usec_t) l * multiplier + k;

         }
 
         *usec = r;
         }
 
         *usec = r;


@@ -800,8 +829,11 @@ int parse_sec(const char *t, usec_t *usec) {
         return 0;
 }
 
         return 0;
 }
 

-/// UNNEEDED by elogind
-#if 0
+int parse_sec(const char *t, usec_t *usec) {
+        return parse_time(t, usec, USEC_PER_SEC);
+}
+
+#if 0 /// UNNEEDED by elogind

 int parse_nsec(const char *t, nsec_t *nsec) {
         static const struct {
                 const char *suffix;
 int parse_nsec(const char *t, nsec_t *nsec) {
         static const struct {
                 const char *suffix;


@@ -1088,4 +1120,28 @@ int get_timezone(char **tz) {
         *tz = z;
         return 0;
 }
         *tz = z;
         return 0;
 }

+
+time_t mktime_or_timegm(struct tm *tm, bool utc) {
+        return utc ? timegm(tm) : mktime(tm);
+}
+#endif // 0
+
+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);
+}
+
+#if 0 /// UNNEEDED by elogind
+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 = (unsigned long) r;
+        }
+
+        return DIV_ROUND_UP(u , USEC_PER_SEC / hz);
+}

 #endif // 0
 #endif // 0