Re: Darwin-kernel Digest, Vol 15, Issue 30
Re: Darwin-kernel Digest, Vol 15, Issue 30
- Subject: Re: Darwin-kernel Digest, Vol 15, Issue 30
- From: Prokash Sinha <email@hidden>
- Date: Thu, 20 Sep 2018 14:11:20 -0700
It was my bad. Now got them running … Basically bundles have same name
-Pro
> On Sep 20, 2018, at 1:24 PM, Prokash Sinha <email@hidden> wrote:
>
> Thanks so much, Eskimo! !
>
> Yeah, that was the thinking - Why would there be just one filter ….
>
> Now I need to dig to see why it is not loading the 2nd one. I’m testing on
> Mojave, but it should be fine.
>
> Also I subscribed to the MacNetworkProg group so I will post there anything
> related to Networking.
>
> -Pro
>
>> On 19 Sep 2018, at 21:31, Prokash Sinha <email@hidden> wrote:
>>
>>> So there are two returns to indicate, if the kernel continue thru the chain
>>> or not.
>>
>> It’s based on the function result:
>>
>> * 0 sends the request down the chain
>>
>> * `EJUSTRETURN` prevents the request going down the chain but doesn’t signal
>> an error to the caller
>>
>> * any other error prevents the request going down the chain and signals that
>> error to the caller
>>
>> You can see this in action in Darwin. For example, consider your
>> `sf_data_out` function. It’s called by `sflt_data_out`, which iterates
>> through the filters call the `sf_data_out` on each filter. That returns if
>> it gets any error. The caller, `sosend`, specifically looks for
>> `EJUSTRETURN` and… well… just returns
>>
>> <https://opensource.apple.com/source/xnu/xnu-4570.1.46/bsd/kern/kpi_socketfilter.c>
>>
>> <https://opensource.apple.com/source/xnu/xnu-4570.1.46/bsd/kern/uipc_socket.c>
>>
>> ps You might want to post your socket filter questions to the MacNetworkProg
>> mailing list. While I’m happy to answer them here, that list has other
>> members with direct experience with this stuff.
>>
>> <https://lists.apple.com/mailman/listinfo/macnetworkprog>
>>
>> Share and Enjoy
>> --
>> Quinn "The Eskimo!" <http://www.apple.com/developer/>
>> Apple Developer Relations, Developer Technical Support, Core OS/Hardware
>>
>>
>> On 20 Sep 2018, at 17:37, Prokash Sinha <email@hidden> wrote:
>>
>>> As it turned out, it seems like not possible to have more than one socket
>>> filter for same protocol …
>>
>> That’s definitely not correct. I’m not sure why your second socket filter
>> is failing to register, but multiple socket filters are supported.
>>
>> Share and Enjoy
>> --
>> Quinn "The Eskimo!" <http://www.apple.com/developer/>
>> Apple Developer Relations, Developer Technical Support, Core OS/Hardware
>>
>
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