| % 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. |