1SD_JOURNAL_GET_REALTIME_USsEdC_(j3o)urnal_get_realtimeS_Du_sJeOcURNAL_GET_REALTIME_USEC(3)
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NAME

6       sd_journal_get_realtime_usec, sd_journal_get_monotonic_usec - Read
7       timestamps from the current journal entry
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SYNOPSIS

10       #include <systemd/sd-journal.h>
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12       int sd_journal_get_realtime_usec(sd_journal *j, uint64_t *usec);
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14       int sd_journal_get_monotonic_usec(sd_journal *j, uint64_t *usec,
15                                         sd_id128_t *boot_id);
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DESCRIPTION

18       sd_journal_get_realtime_usec() gets the realtime (wallclock) timestamp
19       of the current journal entry. It takes two arguments: the journal
20       context object and a pointer to a 64-bit unsigned integer to store the
21       timestamp in. The timestamp is in microseconds since the epoch, i.e.
22       CLOCK_REALTIME.
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24       sd_journal_get_monotonic_usec() gets the monotonic timestamp of the
25       current journal entry. It takes three arguments: the journal context
26       object, a pointer to a 64-bit unsigned integer to store the timestamp
27       in, as well as a 128-bit ID buffer to store the boot ID of the
28       monotonic timestamp. The timestamp is in microseconds since boot-up of
29       the specific boot, i.e.  CLOCK_MONOTONIC. Since the monotonic clock
30       begins new with every reboot, it only defines a well-defined point in
31       time when used together with an identifier identifying the boot. See
32       sd_id128_get_boot(3) for more information. If the boot ID parameter is
33       passed NULL, the function will fail if the monotonic timestamp of the
34       current entry is not of the current system boot.
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36       Note that these functions will not work before sd_journal_next(3) (or
37       related call) has been called at least once, in order to position the
38       read pointer at a valid entry.
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RETURN VALUE

41       sd_journal_get_realtime_usec() and sd_journal_get_monotonic_usec()
42       returns 0 on success or a negative errno-style error code. If the boot
43       ID parameter was passed NULL and the monotonic timestamp of the current
44       journal entry is not of the current system boot, -ESTALE is returned by
45       sd_journal_get_monotonic_usec().
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NOTES

48       The sd_journal_get_realtime_usec() and sd_journal_get_monotonic_usec()
49       interfaces are available as a shared library, which can be compiled and
50       linked to with the libsystemd pkg-config(1) file.
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SEE ALSO

53       systemd(1), sd-journal(3), sd_journal_open(3), sd_journal_next(3),
54       sd_journal_get_data(3), sd_id128_get_boot(3), clock_gettime(2),
55       sd_journal_get_cutoff_realtime_usec(3)
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59systemd 219                                    SD_JOURNAL_GET_REALTIME_USEC(3)
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