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Date: Thu, 29 Apr 2004 14:07:09 +0200
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: Need to replicate TIOCGICOUNT and TIOCMIWAIT on cygwin
Message-ID: <20040429120709.GE17535@cygbert.vinschen.de>
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On Apr 27 11:50, Brian Ford wrote:
> On Tue, 27 Apr 2004, Jim Brain wrote:
> > All the examples online use CreateFile, which I coded up, and cygwin
> > gives me a fd of 8, but select returns immediately and I read -1 bytes
> > on serial.  I looked at the cygwin source, which uses NtCreateFile, but
> > I can't find headers or libraries for that. I am stumped.  I feel like I

Weird.  NtCreateFile is documented in MSDN.

> > am so close...  It's rather a bummer there is a not a
> > cygwin_get_win32_handle(int fd), as that is what I need.

  #include <io.h>
  HANDLE h = (HANDLE) get_osfhandle (fd);
 
> AFAIK, the NtCreateFile change is a very recent one, only available in
> fairly recent snapshots.  It has a bug in that it doesn't support win32
> device paths and thus the internally defined path to the COM ports.
> Hopefully, that will be fixed soon.

Looks like a simple path handling problem.  The current code doesn't
recognize "\\.\" paths.  A fix should be fairly easy, just replace
"\\.\" by "\??\".  So far it always replaces leading "\\" by "\??\UNC\"
so Win32 device names are treated like network paths.


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Co-Project Leader          mailto:cygwin AT cygwin DOT com
Red Hat, Inc.

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