val restart : ('a -> 'b) -> 'a -> 'b
val restarting_select :
  Unix.file_descr list ->
  Unix.file_descr list ->
  Unix.file_descr list ->
  float -> Unix.file_descr list * Unix.file_descr list * Unix.file_descr list
val really_write : Unix.file_descr -> string -> int -> int -> unit
val blocking_read : Unix.file_descr -> string -> int -> int -> int
val really_read : Unix.file_descr -> string -> int -> int -> unit
val domain_of_inet_addr : Unix.inet_addr -> Unix.socket_domain
val int_of_file_descr : Unix.file_descr -> int
val file_descr_of_int : int -> Unix.file_descr
external _exit : int -> unit = "netsys__exit"
external sysconf_open_max : unit -> int = "netsys_sysconf_open_max"
external getpgid : int -> int = "netsys_getpgid"
val getpgrp : unit -> int
external setpgid : int -> int -> unit = "netsys_setpgid"
val setpgrp : unit -> unit
external tcgetpgrp : Unix.file_descr -> int = "netsys_tcgetpgrp"
external tcsetpgrp : Unix.file_descr -> int -> unit = "netsys_tcsetpgrp"
external ctermid : unit -> string = "netsys_ctermid"
external ttyname : Unix.file_descr -> string = "netsys_ttyname"
external getsid : int -> int = "netsys_getsid"
external setreuid : int -> int -> unit = "netsys_setreuid"
external setregid : int -> int -> unit = "netsys_setregid"
external have_posix_shm : unit -> bool = "netsys_have_posix_shm"
type shm_open_flag =
  Netsys.shm_open_flag =
    SHM_O_RDONLY
  | SHM_O_RDWR
  | SHM_O_CREAT
  | SHM_O_EXCL
  | SHM_O_TRUNC
external shm_open : string -> shm_open_flag list -> int -> Unix.file_descr
  = "netsys_shm_open"
external shm_unlink : string -> unit = "netsys_shm_unlink"