sd_journal_get_usage (3) Linux Manual Page
sd_journal_get_usage – Journal disk usage
Synopsis
#include <systemd/sd-journal.h>
int sd_journal_get_usage(sd_journal *j, uint64_t *bytes);Description
sd_journal_get_usage()
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.
Return Value
sd_journal_get_usage() returns 0 on success or a negative errno-style error code.
Notes
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.
See Also
systemd(1), sd-journal(3), sd_journal_open(3),