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% Licensed under the Apache License, Version 2.0 (the "License"); you may not
% use this file except in compliance with the License. You may obtain a copy of
% the License at
%
% http://www.apache.org/licenses/LICENSE-2.0
%
% Unless required by applicable law or agreed to in writing, software
% distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
% WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
% License for the specific language governing permissions and limitations under
% the License.
-module(monitor_parent).
-export([start/0]).
start() ->
{ok, [[PPid]]} = init:get_argument(parent_pid),
spawn(fun() -> monitor_parent(PPid) end).
monitor_parent(PPid) ->
timer:sleep(1000),
case os:type() of
{unix, _} ->
case os:cmd("kill -0 " ++ PPid) of
"" ->
monitor_parent(PPid);
_Else ->
% Assume _Else is a no such process error
init:stop()
end;
{win32, _} ->
Fmt = "tasklist /fi \"PID eq ~s\" /fo csv /nh",
Retval = os:cmd(io_lib:format(Fmt, [PPid])),
case re:run(Retval, "^\"python.exe\",*") of
{match, _} ->
monitor_parent(PPid);
nomatch ->
init:stop()
end
end.
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