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.
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-config(1) file.
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systemd 233 SD_JOURNAL_GET_USAGE(3)