systemd Developer Lennart Poettering lennart@poettering.net sd_journal_get_cutoff_realtime_usec 3 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() gets the realtime (wallclock) timestamps of the first and last entries accessible in the journal. It takes three arguments: the journal context object and two pointers to 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() gets the monotonic timestamps of the first and last entries accessible in the journal. It takes three arguments: the journal context object, a 128-bit identifier for the boot, and two pointers to 64-bit unsigned integers to store the timestamps. 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_boot3 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. 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-journal pkg-config1 file. systemd1, sd-journal3, sd_journal_open3, sd_journal_get_realtime_usec3, sd_id128_get_boot3, clock_gettime2