sd_journal_has_runtime_files (3) Linux Manual Page
sd_journal_has_runtime_files, sd_journal_has_persistent_files – Query availability of runtime or persistent journal files.
Synopsis
#include <systemd/sd-journal.h>
int sd_journal_has_runtime_files(sd_journal *j);
int sd_journal_has_persistent_files(sd_journal *j);Description
sd_journal_has_runtime_files()
sd_journal_has_persistent_files() returns a positive value if persistent journal files (present in /var/log/journal/) have been found. Otherwise returns 0.
Return Value
Both sd_journal_has_runtime_files() and sd_journal_has_persistent_files() return -EINVAL if their argument is NULL.
See Also
sd-journal(3)