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Date: Thu, 21 Feb 2008 23:14:20 +0100
From: Samuel Thibault <samuel DOT thibault AT ens-lyon DOT org>
To: cygwin AT cygwin DOT com
Subject: Re: ioperm() with ports above 0x3ff
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References: <loom DOT 20080218T210001-512 AT post DOT gmane DOT org> <20080221204618 DOT GB10976 AT implementation> <200802220850 DOT 37455 DOT daniel AT nuix DOT com>
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Daniel Noll, le Fri 22 Feb 2008 08:50:37 +1100, a écrit :
> On Friday 22 February 2008 07:46:18 Samuel Thibault wrote:
> > Yes: on Linux ioperm doesn't work above 0x400.  On Linux, so as to
> > access ports above 0x400 you need to use iopl(), that's why ioperm in
> > cygwin does this.  Now, allowing >= 0x400 would be possible in cygwin's
> > ioperm, but then you'd get problems when using the code on Linux...  The
> > truly proper way is really to use iopl().
> 
> On the other hand the iopl() man page specifically says that it shouldn't be 
> used in processes intended to be portable. ;-D

To non-Linux environments, yes, but Cygwin is meant to be
Linux-compatible.

Anyway, tinkering with ports is definitely not portable ;)

Samuel

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