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From: Florian Weimer <fw@deneb.enyo.de>
Newsgroups: comp.lang.ada
Subject: Re: Ada  "library only" compiler ?
Date: Sun, 22 Jul 2012 12:17:12 +0200
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Date: 2012-07-22T12:17:12+02:00
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* Pascal Obry:

> I don't see your point. Interfacing to a DLL is just like interfacing to
> C or whatever. In fact the Win32 DLL API are in C, same on Linux where
> the lib C is used, no? On Windows you interface to fopen() as done on
> UNIXes I suppose or maybe to an even higher level using OpenFile().

There are different types of functions.  For example, fopen is
implemented in user space, while open just moves the arguments into
the right positions and invokes the transition to kernel space, and
sets errno based on the result.  (This is roughly the difference
between section 3 and section 2 of the manual pages.)  Functions like
open are not implemented in C on the user space side.  Whether the
kernel language still counts as C, I'm not sure.