(***********************************************************************)
(*                                                                     *)
(*                           Objective Caml                            *)
(*                                                                     *)
(*            Xavier Leroy, projet Cristal, INRIA Rocquencourt         *)
(*                                                                     *)
(*  Copyright 1996 Institut National de Recherche en Informatique et   *)
(*  en Automatique.  All rights reserved.  This file is distributed    *)
(*  under the terms of the GNU Library General Public License, with    *)
(*  the special exception on linking described in file ../../LICENSE.  *)
(*                                                                     *)
(***********************************************************************)

(* $Id$ *)

(** Thread-compatible system calls.

   This module reimplements some of the functions from [Unix]
   so that they only block the calling thread, not all threads
   in the program, if they cannot complete immediately.
   See the documentation of the {!Unix} module for more
   precise descriptions of the functions below. *)

(** {6 Process handling} *)

val execv : string -> string array -> unit
val execve : string -> string array -> string array -> unit
val execvp : string -> string array -> unit
val wait : unit -> int * Unix.process_status
val waitpid : Unix.wait_flag list -> int -> int * Unix.process_status
val system : string -> Unix.process_status

(** {6 Basic input/output} *)

val read : Unix.file_descr -> string -> int -> int -> int
val write : Unix.file_descr -> string -> int -> int -> int

(** {6 Input/output with timeout} *)

val timed_read :
      Unix.file_descr ->
      string -> int -> int -> float -> int
val timed_write :
      Unix.file_descr ->
      string -> int -> int -> float -> int
      (** Behave as [read] and [write], except that
         [Unix_error(ETIMEDOUT,_,_)] is raised if no data is
         available for reading or ready for writing after [d] seconds.
         The delay [d] is given in the fifth argument, in seconds. *)

(** {6 Polling} *)

val 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

(** {6 Pipes and redirections} *)

val pipe : unit -> Unix.file_descr * Unix.file_descr
val open_process_in: string -> in_channel
val open_process_out: string -> out_channel
val open_process: string -> in_channel * out_channel

(** {6 Time} *)

val sleep : int -> unit

(** {6 Sockets} *)

val socket : Unix.socket_domain ->
             Unix.socket_type -> int -> Unix.file_descr
val accept : Unix.file_descr -> Unix.file_descr * Unix.sockaddr
val connect : Unix.file_descr -> Unix.sockaddr -> unit
val recv : Unix.file_descr -> string ->
           int -> int -> Unix.msg_flag list -> int
val recvfrom : Unix.file_descr -> string -> int -> int ->
               Unix.msg_flag list -> int * Unix.sockaddr
val send : Unix.file_descr -> string -> int -> int ->
           Unix.msg_flag list -> int
val sendto : Unix.file_descr -> string -> int -> int ->
             Unix.msg_flag list -> Unix.sockaddr -> int
val open_connection : Unix.sockaddr -> in_channel * out_channel