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Distinguish between osx and linux programmatically
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Date: -- (:)
From: Romain Beauxis <toots@r...>
Subject: Re: [Caml-list] Distinguish between osx and linux programmatically
Le jeudi 8 juillet 2010 12:01:24, Richard Jones a crit :
> Actually I misunderstood the link I posted
> (http://www.kernel.org/doc/man-pages/online/pages/man2/uname.2.html#NOTES)
> thinking it meant that the string fields in the structure could have
> variable width.  Reading it again, they don't.

And they are terminated by a '\0' symbol so we can pass them to 
ocaml_copy_string...

> Nevertheless I still think this is not a useful addition to stdlib,
> but for different reasons:
> 
> (1) You'd have to emulate it on non-Unix platforms, but it's unclear
> what you'd emulate it with.  Windows has a completely different and
> much richer concept of OS version.  This sort of version probing
> complexity doesn't belong in the core library, but in an external "OS
> version" library where detection rules can be frequently updated.

Well, we already have emulation for many things in OCaml, including much more 
complex parts of the POSIX/UNIX API, like signals, select, threads etc..

Most of these functions, when not implemented raise a (mostly) undocumented 
exception on Windows..

I see no reason why the uname "emulation" could not as well raise an exception 
when it is not implemented (e.g. under Win32).

> (2) Your program only ever calls out to uname once.  The cost of
> running an external program is negligible.

In the general case, I prefer to avoid running external programs. This is way 
to much OS-dependent. A builting alternative, if available, is always better..


Romain