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alcove

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Control plane for Unix processes, containers and sandboxes

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alcove edoc filter-4.edoc
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edoc/filter-4.edoc 

@doc Restrict available calls for control and subprocess



filter/4 allows setting different filters for the control and

subprocesses:



== Examples ==



```

1> catch_exception(true).

false

2> {ok, Drv} = alcove_drv:start().

{ok,<0.189.0>}

3> F1 = alcove:filter({allow, [fork,filter,getcwd]}).

<<255,255,255,231,239,255,255,255,255,255,255,255,15>>

4> F2 = alcove:filter({allow, [getpid,gethostname]}).

<<255,255,255,223,237,255,255,255,255,255,255,255,15>>

% Control process: restricted to: fork, filter

% Any forked control subprocess: restricted to: getpid, gethostname

5> alcove:filter(Drv, [], F1, F2).

ok

6> {ok, Pid} = alcove:fork(Drv, []).

{ok,18721}

7> alcove:getpid(Drv, [Pid]).

18721

8> alcove:getpid(Drv, []).

* exception error: undefined function alcove:getpid/2

9> alcove:getcwd(Drv, [Pid]).

* exception error: undefined function alcove:getcwd/2

10> alcove:getcwd(Drv, []).

{ok, <<"/">>}

'''