Re: connectx() function availability
Re: connectx() function availability
- Subject: Re: connectx() function availability
- From: Greg Parker <email@hidden>
- Date: Fri, 17 Mar 2017 14:48:30 -0700
Historically the libc headers have not used availability annotations. You should file a bug report asking that they do so, with a description of your specific use case.
> On Mar 17, 2017, at 12:12 PM, Pavol Markovic <email@hidden> wrote:
>
> I didn't think about that possibility but it should be doable. Thanks!
>
> I still wonder why the function is not declared with weak_import attribute.
> I have just searched all headers in sys folder and it's not used in any of them.
> Is there a reason for that (i.e. keeping sys headers free of GNU C extensions)?
>
> PM
>
>> On 18 Mar 2017, at 04:33, Damien DeVille <email@hidden> wrote:
>>
>> Probably not ideal but if you have access to the source that uses `connectx` could you resolve the symbol at runtime on newer OS versions with dlopen/dlsym?
>>
>> On Fri, Mar 17, 2017, at 03:23 AM, Pavol Markovic wrote:
>>> Hello,
>>> I'm working on a product statically linking (non-system) libcurl and it
>>> is crashing on OS X 10.8 due to missing _connectx symbol in
>>> /usr/lib/libSystem.B.dylib
>>>
>>> Man page shows that:
>>> The connectx() function call appeared in Darwin 15.0.0
>>>
>>> Why is connectx() function in <sys/socket.h> not marked for weak-linking?
>>> As I understand it's recommended to use weak-linking when extending
>>> dynamic library (libsystem-kernel.dylib in this case).
>>>
>>> As a result the libcurl cannot use connectx() fast tcp connect on 10.11
>>> (and later) and at the same time targetting previous systems which do not
>>> have this function at all.
>>>
>>> Any idea how to solve this except of doing preprocessor checks like:
>>>
>>> #if defined(__MAC_OS_X_VERSION_MIN_REQUIRED)
>>> # if (__MAC_OS_X_VERSION_MIN_REQUIRED >= 101100)
>>> # define HAVE_DARWIN_CONNECTX 1
>>> # endif
>>> #elif defined(__IPHONE_OS_VERSION_MIN_REQUIRED)
>>> # if (__IPHONE_OS_VERSION_MIN_REQUIRED >= 90000)
>>> # define HAVE_DARWIN_CONNECTX 1
>>> # endif
>>> #elif defined(CONNECT_DATA_IDEMPOTENT) /* Fallback for other Darwin OS
>>> */
>>> # define HAVE_DARWIN_CONNECTX 1
>>> #endif
>>>
>>> Best regards,
>>> Pavol Markovic
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