44 lines
1.7 KiB
OCaml
44 lines
1.7 KiB
OCaml
(* Copyright (C) 2023 Petter A. Urkedal <paurkedal@gmail.com>
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*
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* This library is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or (at your
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* option) any later version, with the LGPL-3.0 Linking Exception.
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*
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* This library is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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* License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* and the LGPL-3.0 Linking Exception along with this library. If not, see
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* <http://www.gnu.org/licenses/> and <https://spdx.org>, respectively.
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*)
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open Lwt.Infix
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module Preemptive = Lwt_preemptive
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module Unix = struct
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type file_descr = Lwt_unix.file_descr
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let wrap_fd f fd = f (Lwt_unix.of_unix_file_descr fd)
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let poll ~stdenv:() ?(read = false) ?(write = false) ?timeout fd =
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let choices = []
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|> (fun acc -> if read then Lwt_unix.wait_read fd :: acc else acc)
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|> (fun acc -> if write then Lwt_unix.wait_write fd :: acc else acc)
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|> Option.fold
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~none:Fun.id ~some:(fun t acc -> Lwt_unix.timeout t :: acc) timeout
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in
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if choices = [] then
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Lwt.fail_invalid_arg "Caqti_lwt.Unix.poll: No operation specified."
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else
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Lwt.catch
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(fun () -> Lwt.choose choices >|= fun _ -> false)
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(function
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| Lwt_unix.Timeout -> Lwt.return_true
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| exn -> Lwt.fail exn)
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>|= fun timed_out ->
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(Lwt_unix.readable fd, Lwt_unix.writable fd, timed_out)
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end
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