systemd Developer Lennart Poettering lennart@poettering.net sd_journal_get_usage 3 sd_journal_get_usage Journal disk usage #include <systemd/sd-journal.h> int sd_journal_get_usage sd_journal *j uint64_t *bytes sd_journal_get_usage() determines the total disk space currently used by journal files (in bytes). If SD_JOURNAL_LOCAL_ONLY was passed when opening the journal, this value will only reflect the size of journal files of the local host, otherwise of all hosts. sd_journal_get_usage() returns 0 on success or a negative errno-style error code. All functions listed here are thread-agnostic and only a single thread may operate on a given sd_journal object. The sd_journal_get_usage() interface is available as a shared library, which can be compiled and linked to with the libsystemd pkg-config1 file. systemd1, sd-journal3, sd_journal_open3,