sd_journal_get_cutoff_realtime_usec, sd_journal_get_cutoff_monotonic_usec — Read cut-off timestamps from the current journal entry
#include <systemd/sd-journal.h>
int sd_journal_get_cutoff_realtime_usec( | sd_journal *j, |
| uint64_t *from, | |
uint64_t *to); |
int sd_journal_get_cutoff_monotonic_usec( | sd_journal *j, |
| sd_id128_t boot_id, | |
| uint64_t *from, | |
uint64_t *to); |
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_realtime_usec()
and
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 code.
Locations pointed to by parameters
from and
to will be set only if the
return value is positive, and obviously, the
parameters are non-null.
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.