sd_journal_has_runtime_files, sd_journal_has_persistent_files - Query
availability of runtime or persistent journal files.
sd_journal_has_runtime_files() returns a positive value if runtime
journal files (present in /run/systemd/journal/) have been found. Otherwise
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
All functions listed here are thread-agnostic and only a single specific thread
may operate on a given object during its entire lifetime. It's safe to
allocate multiple independent objects and use each from a specific thread in
parallel. However, it's not safe to allocate such an object in one thread, and
operate or free it from any other, even if locking is used to ensure these
threads don't operate on it at the very same time.
These APIs are implemented as a shared library, which can be
compiled and linked to with the
libsystemd pkg-config(1) file.