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Control plane for Unix processes, containers and sandboxes

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alcove edoc alloc-3.edoc
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edoc/alloc-3.edoc 

@private

@doc Allocate memory



Test memory allocation.



Memory is allocated using a cstruct which is a list containing:



* binary: a value to be allocated and initialized in the memory



* {ptr, integer()}: create a pointer to 0 initialized memory



* {ptr, binary()}: create a pointer to memory initialized to the binary



The return value is an ok tuple:



* the atom ok



* a binary with the raw memory



* an initialized cstruct



== Examples ==



```

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

{ok,<0.182.0>}

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

{ok,4040}

3> alcove:alloc(Drv, [Pid], [<<"initialized">>, {ptr, 16}, {ptr, <<"initialized">>}]).

{ok,<<105,110,105,116,105,97,108,105,122,101,100,48,238,

      23,162,165,87,0,0,80,238,23,162,165,87,0,0>>,

    [<<"initialized">>,

     {ptr,<<0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0>>},

     {ptr,<<"initialized">>}]}



% <<"initialized">>: 105,110,105,116,105,97,108,105,122,101,100

% {ptr,<<0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0>>}: 48,238,23,162,165,87,0,0 (pointer)

% {ptr,<<"initialized">>}: 80,238,23,162,165,87,0,0 (pointer)

'''