[swift-corelibs-dev] Cannot call CFStreamCreatePairWithSocket on Linux

[Max Howell]

For interests sake, how come it could link?

> You are correct, those symbols are from CFNetwork which are not yet implemented on linux targets. CFStream is implemented but CFSocketStream is not implemented in swift-corelibs-foundation. It could be technically reasonable to port the open source (very old) CFNetwork to linux. However I am fairly certain that would take a bit of work to get up and running; especially the Security framework portions.
> 
>> On Mar 15, 2016, at 7:54 AM, Pushkar N Kulkarni via swift-corelibs-dev <swift-corelibs-dev at swift.org <mailto:swift-corelibs-dev at swift.org>> wrote:
>> 
>> 
>> Hello all, 
>> 
>>  While attempting a simple Swift client-server program on Linux using CFSocket, I tried to create CFReadStream and CFWriteStream instances using CFStreamCreatePairWithSocket(_:_:_:_). The program compiles and links but it crashes with this:
>> 
>> 2016-03-15 10:30:17.791 Client[21389:5a501740] CoreFoundation: failed to dynamically link symbol _CFSocketStreamCreatePair
>> 
>> 2016-03-15 10:30:17.791 Client[21389:5a501740] CoreFoundation: failed to dynamically link symbol _CFErrorCreateWithStreamError
>> 
>> 2016-03-15 10:30:17.791 Client[21389:5a501740] CoreFoundation: failed to dynamically link symbol _CFStreamErrorFromCFError
>> 
>> 
>> 
>> 
>> 
>> I see that these symbols are dynamically linked from CFNetwork which, I guess, doesn't exist on Linux (so there is no lookup for these symbols on Linux). 
>> 
>> Does this qualify to be a CFStream limitation on Linux?
>> 
>> Thanks in advance for your time!
>> 
>> Pushkar N Kulkarni,
>> IBM Runtimes
>> 
>> Simplicity is prerequisite for reliability - Edsger W. Dijkstra
>> 
>> 
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> 
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