From: Brian Inglis <Brian.Inglis@SystematicSw.ab.ca>
To: cygwin@cygwin.com
Subject: Re: Incompatible clipboard format between 32bit and 64bit cygwin
Date: Mon, 27 Sep 2021 23:22:30 -0600 [thread overview]
Message-ID: <731c8611-4ed2-29fd-0b9c-33e221d6451e@SystematicSw.ab.ca> (raw)
In-Reply-To: <498f0cfb-c6c1-cb61-2e88-fcb9ce61f4d4@maxrnd.com>
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
This email may be disturbing to some readers as it contains
too much technical detail. Reader discretion is advised.
[Data in binary units and prefixes, physical quantities in SI.]
next prev parent reply other threads:[~2021-09-28 5:22 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-26 1:33 Takashi Yano
2021-09-26 9:50 ` Mark Geisert
2021-09-26 18:37 ` Thomas Wolff
2021-09-26 18:41 ` Thomas Wolff
2021-09-26 19:09 ` Lee
2021-09-26 20:46 ` Brian Inglis
2021-09-28 4:49 ` Mark Geisert
2021-09-28 5:22 ` Brian Inglis [this message]
2021-09-28 6:19 ` Takashi Yano
2021-09-28 6:46 ` Brian Inglis
2021-09-28 8:13 ` Takashi Yano
2021-09-28 17:11 ` Mark Geisert
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