Re: The "black magic" of ioctl

["Frank J. Lhota" <FrankLho.NOSPAM@rcn.com>]

On 10/24/2010 1:56 PM, Florian Weimer wrote:

> Perhaps it seems to work for you, but this is not portable.  There are
> popular targets where the varargs calling convention is markedly
> different from the non-varargs calling convention, such as amd64.
> It might still work by accident, but all bets are off, really.

The Microsoft documentation seems to say that varargs is _not_ markedly 
different; see

     http://msdn.microsoft.com/en-us/library/dd2wa36c%28v=VS.80%29.aspx

I will concede, however, that these Import pragmas may not be portable 
to all platforms, but that is true of Import pragmas in general. After 
all, the calling convention for ioctl can vary from platform to 
platform, not to mention which calling conventions are supported by the 
Ada compiler.

I am absolutely sure that my pragmas will not work with MS Windows, for 
an more elementary reason: Win32 / Win64 does not support the ioctl 
function at all! Instead, the function DeviceIoControl is used to query 
configure most devices, and the function ioctlsocket is used to query / 
configure sockets. See

      http://msdn.microsoft.com/en-us/library/aa363216.aspx
      http://msdn.microsoft.com/en-us/library/ms738573%28VS.85%29.aspx

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