X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Fbasic%2Ftime-util.h;h=58b8c53006a6b4d753fbf5eb6814ce3c31567618;hp=48ca453e644a6f4593ec780cabba7e4c994ebaaf;hb=9742b1e43855b1599bd52ff95af995d9a9d35eac;hpb=1cfc78c91965df340cdde100ad6cb3ed50b28927

diff --git a/src/basic/time-util.h b/src/basic/time-util.h
index 48ca453e6..58b8c5300 100644
--- a/src/basic/time-util.h
+++ b/src/basic/time-util.h
@@ -1,5 +1,3 @@
-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
 #pragma once
 
 /***
@@ -21,14 +19,20 @@
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 ***/
 
-#include <stdio.h>
 #include <inttypes.h>
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <time.h>
 
 typedef uint64_t usec_t;
 typedef uint64_t nsec_t;
 
-#define NSEC_FMT "%" PRIu64
-#define USEC_FMT "%" PRIu64
+#define PRI_NSEC PRIu64
+#define PRI_USEC PRIu64
+#define NSEC_FMT "%" PRI_NSEC
+#define USEC_FMT "%" PRI_USEC
 
 #include "macro.h"
 
@@ -37,6 +41,12 @@ typedef struct dual_timestamp {
         usec_t monotonic;
 } dual_timestamp;
 
+typedef struct triple_timestamp {
+        usec_t realtime;
+        usec_t monotonic;
+        usec_t boottime;
+} triple_timestamp;
+
 #define USEC_INFINITY ((usec_t) -1)
 #define NSEC_INFINITY ((nsec_t) -1)
 
@@ -60,52 +70,153 @@ typedef struct dual_timestamp {
 #define USEC_PER_YEAR ((usec_t) (31557600ULL*USEC_PER_SEC))
 #define NSEC_PER_YEAR ((nsec_t) (31557600ULL*NSEC_PER_SEC))
 
-#define FORMAT_TIMESTAMP_MAX ((4*4+1)+11+9+4+1) /* weekdays can be unicode */
+/* We assume a maximum timezone length of 6. TZNAME_MAX is not defined on Linux, but glibc internally initializes this
+ * to 6. Let's rely on that. */
+#define FORMAT_TIMESTAMP_MAX (3+1+10+1+8+1+6+1+6+1)
 #define FORMAT_TIMESTAMP_WIDTH 28 /* when outputting, assume this width */
 #define FORMAT_TIMESTAMP_RELATIVE_MAX 256
 #define FORMAT_TIMESPAN_MAX 64
 
-#define TIME_T_MAX (time_t)((1UL << ((sizeof(time_t) << 3) - 1)) - 1)
+#define TIME_T_MAX (time_t)((UINTMAX_C(1) << ((sizeof(time_t) << 3) - 1)) - 1)
 
-#define DUAL_TIMESTAMP_NULL ((struct dual_timestamp) { 0ULL, 0ULL })
+#define DUAL_TIMESTAMP_NULL ((struct dual_timestamp) {})
+#define TRIPLE_TIMESTAMP_NULL ((struct triple_timestamp) {})
 
 usec_t now(clockid_t clock);
+#if 0 /// UNNEEDED by elogind
+nsec_t now_nsec(clockid_t clock);
+#endif // 0
 
 dual_timestamp* dual_timestamp_get(dual_timestamp *ts);
 dual_timestamp* dual_timestamp_from_realtime(dual_timestamp *ts, usec_t u);
+#if 0 /// UNNEEDED by elogind
 dual_timestamp* dual_timestamp_from_monotonic(dual_timestamp *ts, usec_t u);
+dual_timestamp* dual_timestamp_from_boottime_or_monotonic(dual_timestamp *ts, usec_t u);
+#endif // 0
+
+triple_timestamp* triple_timestamp_get(triple_timestamp *ts);
+triple_timestamp* triple_timestamp_from_realtime(triple_timestamp *ts, usec_t u);
+
+#define DUAL_TIMESTAMP_HAS_CLOCK(clock)                               \
+        IN_SET(clock, CLOCK_REALTIME, CLOCK_REALTIME_ALARM, CLOCK_MONOTONIC)
+
+#define TRIPLE_TIMESTAMP_HAS_CLOCK(clock)                               \
+        IN_SET(clock, CLOCK_REALTIME, CLOCK_REALTIME_ALARM, CLOCK_MONOTONIC, CLOCK_BOOTTIME, CLOCK_BOOTTIME_ALARM)
 
 static inline bool dual_timestamp_is_set(dual_timestamp *ts) {
         return ((ts->realtime > 0 && ts->realtime != USEC_INFINITY) ||
                 (ts->monotonic > 0 && ts->monotonic != USEC_INFINITY));
 }
 
+static inline bool triple_timestamp_is_set(triple_timestamp *ts) {
+        return ((ts->realtime > 0 && ts->realtime != USEC_INFINITY) ||
+                (ts->monotonic > 0 && ts->monotonic != USEC_INFINITY) ||
+                (ts->boottime > 0 && ts->boottime != USEC_INFINITY));
+}
+
+usec_t triple_timestamp_by_clock(triple_timestamp *ts, clockid_t clock);
+
 usec_t timespec_load(const struct timespec *ts) _pure_;
+#if 0 /// UNNEEDED by elogind
+nsec_t timespec_load_nsec(const struct timespec *ts) _pure_;
+#endif // 0
 struct timespec *timespec_store(struct timespec *ts, usec_t u);
 
 usec_t timeval_load(const struct timeval *tv) _pure_;
 struct timeval *timeval_store(struct timeval *tv, usec_t u);
 
 char *format_timestamp(char *buf, size_t l, usec_t t);
-// UNNEEDED char *format_timestamp_utc(char *buf, size_t l, usec_t t);
+#if 0 /// UNNEEDED by elogind
+char *format_timestamp_utc(char *buf, size_t l, usec_t t);
+#endif // 0
 char *format_timestamp_us(char *buf, size_t l, usec_t t);
+#if 0 /// UNNEEDED by elogind
 char *format_timestamp_us_utc(char *buf, size_t l, usec_t t);
+#endif // 0
 char *format_timestamp_relative(char *buf, size_t l, usec_t t);
 char *format_timespan(char *buf, size_t l, usec_t t, usec_t accuracy);
 
+#if 0 /// UNNEEDED by elogind
 void dual_timestamp_serialize(FILE *f, const char *name, dual_timestamp *t);
 int dual_timestamp_deserialize(const char *value, dual_timestamp *t);
+#endif // 0
+int timestamp_deserialize(const char *value, usec_t *timestamp);
 
-// UNNEEDED int parse_timestamp(const char *t, usec_t *usec);
+#if 0 /// UNNEEDED by elogind
+int parse_timestamp(const char *t, usec_t *usec);
+#endif // 0
 
 int parse_sec(const char *t, usec_t *usec);
+int parse_time(const char *t, usec_t *usec, usec_t default_unit);
+#if 0 /// UNNEEDED by elogind
 int parse_nsec(const char *t, nsec_t *nsec);
 
-// UNNEEDED bool ntp_synced(void);
+bool ntp_synced(void);
 
-// UNNEEDED int get_timezones(char ***l);
-// UNNEEDED bool timezone_is_valid(const char *name);
+int get_timezones(char ***l);
+bool timezone_is_valid(const char *name);
 
+#endif // 0
+bool clock_boottime_supported(void);
+bool clock_supported(clockid_t clock);
+#if 0 /// UNNEEDED by elogind
 clockid_t clock_boottime_or_monotonic(void);
 
-#define xstrftime(buf, fmt, tm) assert_se(strftime(buf, ELEMENTSOF(buf), fmt, tm) > 0)
+usec_t usec_shift_clock(usec_t, clockid_t from, clockid_t to);
+#endif // 0
+
+#define xstrftime(buf, fmt, tm) \
+        assert_message_se(strftime(buf, ELEMENTSOF(buf), fmt, tm) > 0, \
+                          "xstrftime: " #buf "[] must be big enough")
+
+#if 0 /// UNNEEDED by elogind
+int get_timezone(char **timezone);
+
+time_t mktime_or_timegm(struct tm *tm, bool utc);
+#endif // 0
+struct tm *localtime_or_gmtime_r(const time_t *t, struct tm *tm, bool utc);
+
+#if 0 /// UNNEEDED by elogind
+unsigned long usec_to_jiffies(usec_t usec);
+#endif // 0
+
+static inline usec_t usec_add(usec_t a, usec_t b) {
+        usec_t c;
+
+        /* Adds two time values, and makes sure USEC_INFINITY as input results as USEC_INFINITY in output, and doesn't
+         * overflow. */
+
+        c = a + b;
+        if (c < a || c < b) /* overflow check */
+                return USEC_INFINITY;
+
+        return c;
+}
+
+static inline usec_t usec_sub_unsigned(usec_t timestamp, usec_t delta) {
+
+        if (timestamp == USEC_INFINITY) /* Make sure infinity doesn't degrade */
+                return USEC_INFINITY;
+        if (timestamp < delta)
+                return 0;
+
+        return timestamp - delta;
+}
+
+static inline usec_t usec_sub_signed(usec_t timestamp, int64_t delta) {
+        if (delta < 0)
+                return usec_add(timestamp, (usec_t) (-delta));
+        else
+                return usec_sub_unsigned(timestamp, (usec_t) delta);
+}
+
+#if SIZEOF_TIME_T == 8
+/* The last second we can format is 31. Dec 9999, 1s before midnight, because otherwise we'd enter 5 digit year
+ * territory. However, since we want to stay away from this in all timezones we take one day off. */
+#define USEC_TIMESTAMP_FORMATTABLE_MAX ((usec_t) 253402214399000000)
+#elif SIZEOF_TIME_T == 4
+/* With a 32bit time_t we can't go beyond 2038... */
+#define USEC_TIMESTAMP_FORMATTABLE_MAX ((usec_t) 2147483647000000)
+#else
+#error "Yuck, time_t is neither 4 not 8 bytes wide?"
+#endif