User  |  Syst  |  Libr  |  Device  |  Files  |  Other  |  Admin  |  Head  |

---

   sd_journal_get_cutoff_monotonic_usec    ( 3 )

---

---

Имя (Name)

sd_journal_get_cutoff_realtime_usec,
       sd_journal_get_cutoff_monotonic_usec - Read cut-off timestamps
       from the current journal entry

---

Синопсис (Synopsis)

#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);

---

Описание (Description)

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.

---

Возвращаемое значение (Return value)

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.

---

Примечание (Note)

All functions listed here are thread-agnostic and only a single
       specific thread may operate on a given object during its entire
       lifetime. It's safe to allocate multiple independent objects and
       use each from a specific thread in parallel. However, it's not
       safe to allocate such an object in one thread, and operate or
       free it from any other, even if locking is used to ensure these
       threads don't operate on it at the very same time.

       These APIs are implemented as a shared library, which can be
       compiled and linked to with the libsystemd pkg-config(1) file.

---

Смотри также (See also)

systemd(1), sd-journal(3), sd_journal_open(3),
       sd_journal_get_realtime_usec(3), sd_id128_get_boot(3),
       clock_gettime(2)

---