(**
 * Copyright (c) 2013-present, Facebook, Inc.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *)

exception FailedToKill of string option

let mean_kill ~tmp_dir root =
  let pids =
    try PidLog.get_pids (Server_files_js.pids_file ~tmp_dir root)
    with PidLog.FailedToGetPids ->
      let msg = Printf.sprintf
        "Unable to figure out pids of running Flow server. \
        Try manually killing it with 'pkill %s' (be careful on shared \
        devservers)"
        Utils_js.exe_name
      in
      raise (FailedToKill (Some msg))
  in
  List.iter (fun (pid, _) ->
    try
      pid
      |> Sys_utils.handle_of_pid_for_termination
      |> Sys_utils.terminate_process
    with Unix.Unix_error (Unix.ESRCH, "kill", _) ->
      (* no such process *)
      ()
  ) pids;
  ignore(Unix.sleep 1);
  if CommandConnectSimple.server_exists ~tmp_dir root
  then raise (FailedToKill None);
  ()
