DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 3E2773858C60
Subject: Re: Incompatible clipboard format between 32bit and 64bit cygwin
To: cygwin@cygwin.com
References: <20210926103325.5c17eb11c3c8a56c377199a8@nifty.ne.jp>
 <584f536c-b108-b562-b940-798ec2847c68@maxrnd.com>
From: Thomas Wolff <towo@towo.net>
Message-ID: <0b13b9ac-583f-ab72-4202-f8b187946d93@towo.net>
Date: Sun, 26 Sep 2021 20:37:45 +0200
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101
 Thunderbird/78.14.0
MIME-Version: 1.0
In-Reply-To: <584f536c-b108-b562-b940-798ec2847c68@maxrnd.com>
Precedence: list
Content-Type: text/plain; charset="utf-8"; Format="flowed"
Errors-To: cygwin-bounces+archive-cygwin=delorie.com@cygwin.com
Sender: "Cygwin" <cygwin-bounces+archive-cygwin=delorie.com@cygwin.com>
Content-Transfer-Encoding: 8bit


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.  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
>


-- 
Problem reports:      https://cygwin.com/problems.html
FAQ:                  https://cygwin.com/faq/
Documentation:        https://cygwin.com/docs.html
Unsubscribe info:     https://cygwin.com/ml/#unsubscribe-simple