extern int systemd_get_units_dir(char *path, size_t pathlen, int isuser);
extern int systemd_get_unit_path(char *path, size_t pathlen, int isuser, const char *unit, const char *uext);
extern int systemd_get_wants_path(char *path, size_t pathlen, int isuser, const char *wanter, const char *unit, const char *uext);
extern int systemd_get_units_dir(char *path, size_t pathlen, int isuser);
extern int systemd_get_unit_path(char *path, size_t pathlen, int isuser, const char *unit, const char *uext);
extern int systemd_get_wants_path(char *path, size_t pathlen, int isuser, const char *wanter, const char *unit, const char *uext);