external drop_caches : t -> int -> unit = "ocaml_guestfs_drop_caches"
external dmesg : t -> string = "ocaml_guestfs_dmesg"
external ping_daemon : t -> unit = "ocaml_guestfs_ping_daemon"
external drop_caches : t -> int -> unit = "ocaml_guestfs_drop_caches"
external dmesg : t -> string = "ocaml_guestfs_dmesg"
external ping_daemon : t -> unit = "ocaml_guestfs_ping_daemon"