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Subject:	Re: Incompatible clipboard format between 32bit and 64bit cygwin
To:	cygwin AT cygwin DOT com
References:	<20210926103325 DOT 5c17eb11c3c8a56c377199a8 AT nifty DOT ne DOT jp>
	<584f536c-b108-b562-b940-798ec2847c68 AT maxrnd DOT com>
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From:	Brian Inglis <Brian DOT Inglis AT SystematicSw DOT ab DOT ca>
Organization:	Systematic Software
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Date:	Mon, 27 Sep 2021 23:22:30 -0600
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On 2021-09-27 22:49, Mark Geisert wrote:
> Hi Thomas,
> 
> Thomas Wolff wrote:
>>
>> Am 26.09.2021 um 20:37 schrieb Thomas Wolff:
>>>
>>> Am 26.09.2021 um 11:50 schrieb Mark Geisert:
>>>> 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 and it failed; I just didn't find it important enough to 
>>> report it here... Thanks for the plan to fix it.
>>>
>>>> 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. 
>> As we're at it, what's the purpose of a cygwin-internal clipboard 
>> format at all?
>> Copy/paste between 32bit/64bit mintty works; mintty uses Windows 
>> CF_UNICODETEXT clipboard format.
> 
> The cygwin-internal clipboard format records a timestamp and content 
> length when Cygwin (or putclip) updates the clipboard contents.  This 
> allows 'stat' and fstat() to show something sensible for 
> /dev/clipboard.  The latter feature went into Cygwin 1.7.13.
> 
> Other than that, not much difference to CF_UNICODETEXT ;-).

Would it perhaps make sense to include struct stat with appropriate 
entries rather than a couple of adhoc members unrelated to much else?

-- 
Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada

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