2017-05-26 14:30:34 +00:00
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(* (c) 2017 Hannes Mehnert, all rights reserved *)
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open Lwt.Infix
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let pp_process_status ppf = function
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2017-12-20 21:29:22 +00:00
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| Unix.WEXITED c -> Fmt.pf ppf "exited with %d" c
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| Unix.WSIGNALED s -> Fmt.pf ppf "killed by signal %a" Fmt.Dump.signal s
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| Unix.WSTOPPED s -> Fmt.pf ppf "stopped by signal %a" Fmt.Dump.signal s
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2017-05-26 14:30:34 +00:00
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let ret = function
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| Unix.WEXITED c -> `Exit c
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| Unix.WSIGNALED s -> `Signal s
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| Unix.WSTOPPED s -> `Stop s
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2018-03-18 13:04:44 +00:00
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let rec waitpid pid =
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Lwt.catch
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(fun () -> Lwt_unix.waitpid [] pid >|= fun r -> Ok r)
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(function
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| Unix.(Unix_error (EINTR, _, _)) ->
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Logs.debug (fun m -> m "EINTR in waitpid(), %d retrying" pid) ;
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waitpid pid
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| e ->
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Logs.err (fun m -> m "error %s in waitpid() %d"
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(Printexc.to_string e) pid) ;
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Lwt.return (Error ()))
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2017-05-26 14:30:34 +00:00
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let wait_and_clear pid stdout =
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2018-03-18 13:04:44 +00:00
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Logs.debug (fun m -> m "waitpid() for pid %d" pid) ;
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waitpid pid >|= fun r ->
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2018-07-07 21:14:42 +00:00
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Vmm_unix.close_no_err stdout ;
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2018-03-18 13:04:44 +00:00
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match r with
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| Error () ->
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Logs.err (fun m -> m "waitpid() for %d returned error" pid) ;
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`Exit 23
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| Ok (_, s) ->
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Logs.debug (fun m -> m "pid %d exited: %a" pid pp_process_status s) ;
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ret s
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2017-05-26 14:30:34 +00:00
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let read_exactly s =
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let buf = Bytes.create 8 in
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let rec r b i l =
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2018-03-18 17:30:43 +00:00
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Lwt.catch (fun () ->
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Lwt_unix.read s b i l >>= function
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| 0 ->
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Logs.err (fun m -> m "end of file while reading") ;
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Lwt.return (Error `Eof)
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| n when n == l -> Lwt.return (Ok ())
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| n when n < l -> r b (i + n) (l - n)
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| _ ->
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Logs.err (fun m -> m "read too much, shouldn't happen)") ;
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Lwt.return (Error `Toomuch))
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(fun e ->
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let err = Printexc.to_string e in
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Logs.err (fun m -> m "exception %s while reading" err) ;
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Lwt.return (Error `Exception))
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2017-05-26 14:30:34 +00:00
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in
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2018-03-18 17:30:43 +00:00
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r buf 0 8 >>= function
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| Error e -> Lwt.return (Error e)
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| Ok () ->
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match Vmm_wire.parse_header (Bytes.to_string buf) with
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| Error (`Msg m) -> Lwt.return (Error (`Msg m))
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| Ok hdr ->
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let l = hdr.Vmm_wire.length in
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if l > 0 then
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let b = Bytes.create l in
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r b 0 l >|= function
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| Error e -> Error e
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| Ok () ->
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2018-03-22 13:12:50 +00:00
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(* Logs.debug (fun m -> m "read hdr %a, body %a"
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2018-03-18 17:30:43 +00:00
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Cstruct.hexdump_pp (Cstruct.of_bytes buf)
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2018-03-22 13:12:50 +00:00
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Cstruct.hexdump_pp (Cstruct.of_bytes b)) ; *)
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2018-03-18 17:30:43 +00:00
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Ok (hdr, Bytes.to_string b)
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else
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Lwt.return (Ok (hdr, ""))
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2017-05-26 14:30:34 +00:00
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let write_raw s buf =
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let buf = Bytes.unsafe_of_string buf in
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let rec w off l =
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2018-03-18 17:30:43 +00:00
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Lwt.catch (fun () ->
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Lwt_unix.send s buf off l [] >>= fun n ->
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if n = l then
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Lwt.return (Ok ())
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else
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w (off + n) (l - n))
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(fun e ->
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Logs.err (fun m -> m "exception %s while writing" (Printexc.to_string e)) ;
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Lwt.return (Error `Exception))
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2017-05-26 14:30:34 +00:00
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in
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2018-03-22 13:12:50 +00:00
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(* Logs.debug (fun m -> m "writing %a" Cstruct.hexdump_pp (Cstruct.of_bytes buf)) ; *)
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2017-05-26 14:30:34 +00:00
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w 0 (Bytes.length buf)
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