systemd sd_journal_has_runtime_files 3 sd_journal_has_runtime_files sd_journal_has_persistent_files Query availability of runtime or persistent journal files. #include <systemd/sd-journal.h> int sd_journal_has_runtime_files sd_journal *j int sd_journal_has_persistent_files sd_journal *j sd_journal_has_runtime_files() returns a positive value if runtime journal files (present in /run/systemd/journal/) have been found. Otherwise returns 0. sd_journal_has_persistent_files() returns a positive value if persistent journal files (present in /var/log/journal/) have been found. Otherwise returns 0. Both sd_journal_has_runtime_files() and sd_journal_has_persistent_files() return -EINVAL if their argument is NULL. All functions listed here are thread-agnostic and only a single thread may operate on a given sd_journal object. sd-journal3