sd_journal_get_cutoff_realtime_usec() retrieves the realtime
(wallclock) timestamps of the first and last entries accessible in
the journal. It takes three arguments: the journal context object j
and two pointers from and to pointing at 64-bit unsigned integers to
store the timestamps in. The timestamps are in microseconds since the
epoch, i.e. CLOCK_REALTIME. Either one of the two timestamp
arguments may be passed as NULL in case the timestamp is not needed,
but not both.
sd_journal_get_cutoff_monotonic_usec() retrieves the monotonic
timestamps of the first and last entries accessible in the journal.
It takes three arguments: the journal context object j, a 128-bit
identifier for the boot boot_id, and two pointers to 64-bit unsigned
integers to store the timestamps, from and to. The timestamps are 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. The function will return
the timestamps for the boot identified by the passed boot ID. Either
one of the two timestamp arguments may be passed as NULL in case the
timestamp is not needed, but not both.
sd_journal_get_cutoff_monotonic_usec() return 1 on success, 0 if not
suitable entries are in the journal or a negative errno-style error
Locations pointed to by parameters from and to will be set only if
the return value is positive, and obviously, the parameters are
All functions listed here are thread-agnostic and only a single
thread may operate on a given sd_journal object.
The sd_journal_get_cutoff_realtime_usec() and
sd_journal_get_cutoff_monotonic_usec() interfaces are available as a
shared library, which can be compiled and linked to with the
libsystemd pkg-config(1) file.
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systemd 233 SD_JOURNAL_GET_CUTOFF_REALTIME_USEC(3)