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Date: Fri, 22 Nov 2002 17:59:06 -0500
From: Christopher Faylor <cgf AT redhat DOT com>
To: cygwin AT cygwin DOT com
Cc: Randy_Holmes AT bmc DOT com
Subject: Re: cygwin DLL 1.3.14-1  "cygdrive flags" registry entry
Message-ID: <20021122225906.GC11995@redhat.com>
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References: <626E9D01B882D311B49E00A0C9EBE2E20DCF75BB AT ES01-AUS DOT bmc DOT com>
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On Fri, Nov 22, 2002 at 04:51:11PM -0600, Holmes, Randy wrote:
>I am trying to prepare a series of cygwin dependant applications for
>distribution.  The available documentation says all that is required is
>to distribute the cygwin1.dll with the apps.  However when I tried this
>I had corrupted data returned from a read call.
>
>After much experimenting I determined that when cygwin is installed
>there are some registry settings that effect the behavior of the
>library.  I determined that the following registry entry will make my
>problem 'go away'
>
>============================================================
> Windows Registry Editor Version 5.00
>
> [HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions]
>
> [HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\Cygwin]
>
> [HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\Cygwin\mounts v2]
> "cygdrive flags"=dword:00000022
>
>============================================================
>
>Can anybody point me to some documentation which explains the "cygdrive
>flags" entry: What flags are available?  What effect they have on
>application behavior?  Can they be set programmatically?  etc...

We do not advertise the contents of the registry.  You shouldn't even
be worrying about them.  They are subject to change without notice.

If you are getting corrupted data it is undoubtedly a binmode/textmode
issue.  You need to modify your program to properly open files in the
correct mode, i.e., if you are opening a file which is binary, use:

  FILE *fp = fopen ("foo", "rb");

  or

  int fd = open ("foo", O_RDONLY | O_BINARY);

Btw, I'm sure you know this, but if you are preparing something for
distribution then your distribution will be open source.  That's a
stipulation of the cygwin license.  Either that or you need to
purchase a cygwin license from Red Hat.

cgf

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