Tim Ellison wrote:
> Gregory Shimansky wrote:
>> Tim Ellison wrote:
>>> Gregory Shimansky wrote:
>>>> Tim Ellison wrote:
>>>>> Maybe we do, i.e. where there is no value "-Dfoobar". So perhaps we
>>>>> need to say that GetSystemProperty returns VMI_ERROR_NONE and sets the
>>>>> the *valuePtr to NULL if there is no value; and returns a
>>>>> VMI_ERROR_NOT_FOUND if the property is undefined.
>>>> Now I am confused. What is the difference between a property which has
>>>> no value and an undefined property?
>>> Sorry, I meant a property whose value is NULL. So the three cases are:
>>>
>>> 1) key = "foo", value = "bar"
>>> 2) key = "foo", value = NULL
>>> 3) no key called "foo"
>>>
>>> If (2) is disallowed then we should document that in SetSystemProperty().
>> I would prefer to have (2) to be illegal. Can we document this please?
>
> No objection here. So to attempt a new clarification ...
>
> GetSystemProperty will return VMI_ERROR_NONE and a string value for
> existing properties, or NULL value for a non-existent property.
>
> We then rename VMI_ERROR_NOT_FOUND to VMI_ERROR_ILLEGAL_ARG and
> SetSystemProperty will return VMI_ERROR_NONE for setting an existing
> property to a string value, or VMI_ILLEGAL_ARG if there is an attempt to
> set the property value to NULL.
>
> How does that sound?
I agree. +1 here. To fix drlvm VMI implementation only the following
change is required:
Index: vm/vmi/src/vmi.cpp
===================================================================
--- vm/vmi/src/vmi.cpp (revision 486697)
+++ vm/vmi/src/vmi.cpp (working copy)
@@ -151,13 +151,11 @@
{
*valuePtr = strdup(value);
destroy_property_value(value);
- return VMI_ERROR_NONE;
}
else
- {
*valuePtr = NULL;
- return VMI_ERROR_NOT_FOUND;
- }
+
+ return VMI_ERROR_NONE;
}
vmiError JNICALL
--
Gregory
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