NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | NOTES | SEE ALSO | COLOPHON

SD_JOURNAL_GET_REALTIME_USEC(3)nal_get_realtime_usecNAL_GET_REALTIME_USEC(3)

NAME         top

       sd_journal_get_realtime_usec, sd_journal_get_monotonic_usec - Read
       timestamps from the current journal entry

SYNOPSIS         top

       #include <systemd/sd-journal.h>

       int sd_journal_get_realtime_usec(sd_journal *j, uint64_t *usec);

       int sd_journal_get_monotonic_usec(sd_journal *j, uint64_t *usec,
                                         sd_id128_t *boot_id);

DESCRIPTION         top

       sd_journal_get_realtime_usec() gets the realtime (wallclock)
       timestamp of the current journal entry. It takes two arguments: the
       journal context object and a pointer to a 64-bit unsigned integer to
       store the timestamp in. The timestamp is in microseconds since the
       epoch, i.e.  CLOCK_REALTIME.

       sd_journal_get_monotonic_usec() gets the monotonic timestamp of the
       current journal entry. It takes three arguments: the journal context
       object, a pointer to a 64-bit unsigned integer to store the timestamp
       in, as well as a 128-bit ID buffer to store the boot ID of the
       monotonic timestamp. The timestamp is in microseconds since boot-up
       of the specific boot, i.e.  CLOCK_MONOTONIC. Since the monotonic
       clock begins new with every reboot, it only defines a well-defined
       point in time when used together with an identifier identifying the
       boot. See sd_id128_get_boot(3) for more information. If the boot ID
       parameter is passed NULL, the function will fail if the monotonic
       timestamp of the current entry is not of the current system boot.

       Note that these functions will not work before sd_journal_next(3) (or
       related call) has been called at least once, in order to position the
       read pointer at a valid entry.

RETURN VALUE         top

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

NOTES         top

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

SEE ALSO         top

       systemd(1), sd-journal(3), sd_journal_open(3), sd_journal_next(3),
       sd_journal_get_data(3), sd_id128_get_boot(3), clock_gettime(2),
       sd_journal_get_cutoff_realtime_usec(3)

COLOPHON         top

       This page is part of the systemd (systemd system and service manager)
       project.  Information about the project can be found at 
       ⟨http://www.freedesktop.org/wiki/Software/systemd⟩.  If you have a bug
       report for this manual page, see 
       ⟨http://www.freedesktop.org/wiki/Software/systemd/#bugreports⟩.  This
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       COLOPHON (which is not part of the original manual page), send a mail
       to man-pages@man7.org

systemd 231                                  SD_JOURNAL_GET_REALTIME_USEC(3)