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Subject: Re: Incompatible clipboard format between 32bit and 64bit cygwin
To: cygwin@cygwin.com
References: <20210926103325.5c17eb11c3c8a56c377199a8@nifty.ne.jp>
From: Mark Geisert <mark@maxrnd.com>
Message-ID: <584f536c-b108-b562-b940-798ec2847c68@maxrnd.com>
Date: Sun, 26 Sep 2021 02:50:58 -0700
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Hi Takashi,

Takashi Yano via Cygwin wrote:
> I noticed that cygwin clipboard is not compatible
> between 32bit and 64bit cygwin.
> 
> If I run 'echo AAAAAAAA > /dev/clipboard' in 32bit cygwin,
> and run 'cat /dev/clipboard' in 64bit cygwin, this result in
> cat: /dev/clipboard: Bad address
> 
> This is because the structure
> typedef struct
> {
>    timestruc_t   timestamp;
>    size_t    len;
>    char      data[1];
> } cygcb_t;
> defined in fhandler_clipboard.cc has different size.
> 
> Is this the known issue?

I doubt anybody has ever tried what you did.  I have been testing getclip and 
putclip between 32- and 64-bit environments, but neglected to test Cygwin-internal 
clipboard format that prepends cygcb_t to the user-supplied data.  So getclip and 
putclip will need fixing as well.

I will submit a Cygwin patch to fix /dev/clipboard usage and a similar patch to 
cygutils for the utilities.

I appreciate your help in uncovering and investigating bugs in clipboard support.
Thanks & Regards,

..mark

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