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## Name

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

## 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`)`;

## 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.

## 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.

## Notes

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.

## 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)