Re: connectx() function availability
Re: connectx() function availability
- Subject: Re: connectx() function availability
- From: Pavol Markovic <email@hidden>
- Date: Sat, 18 Mar 2017 08:12:51 +1300
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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