console: new mouse modes, request/response attempt

Thomas Wolff
Mon Apr 2 19:50:00 GMT 2012

Am 02.04.2012 20:50, schrieb Christopher Faylor:
> On Mon, Apr 02, 2012 at 08:46:31PM +0200, Thomas Wolff wrote:
>> This patch includes 2 things (to be fixed and separated anyway; change
>> log still missing) for discussion:
>> * mouse modes 6 and 15 (numeric mouse coordinates)
>> * semi-fix for missing terminal status responses
>> The fix tries to detect the proper fhandler for CONIO, which is then
>> used to queue the response.
>> Problem 1: I am not sure whether this detection is proper in all cases,
>> what e.g. if /dev/tty is reopened etc. I don't know where else a
>> relation between the handles for CONIN and CONOUT might be established.
>> Problem 2: While the response reaches the application with this patch,
>> only the first byte is read right-away. Further bytes are delayed until
>> other input is becoming present (typing a key). This may (or may not) be
>> related to other issues with select(), so maybe it's worth analyzing it.
>> Thomas
>> diff -rup sav/fhandler.h ./fhandler.h
>> --- sav/fhandler.h	2012-04-01 19:46:04.000000000 +0200
>> +++ ./fhandler.h	2012-04-02 15:47:22.385727000 +0200
>> @@ -1282,8 +1282,11 @@ class dev_console
>>    bool insert_mode;
>>    int use_mouse;
>> +  bool ext_mouse_mode6;
>> +  bool ext_mouse_mode15;
>>    bool use_focus;
>>    bool raw_win32_keyboard_mode;
>> +  fhandler_console * fh_tty;
>>    inline UINT get_console_cp ();
>>    DWORD con_to_str (char *d, int dlen, WCHAR w);
>> diff -rup sav/ ./
>> --- sav/	2012-04-02 00:28:55.000000000 +0200
>> +++ ./	2012-04-02 18:02:26.004016200 +0200
>> @@ -139,6 +139,8 @@ fhandler_console::set_unit ()
>>    if (shared_console_info)
>>      {
>>        fh_devices this_unit = dev ();
>> +      if (this_unit == FH_TTY)
>> +	dev_state.fh_tty = this;
> You *definitely* just can't squirrel away a pointer to a random fhandler
> here.
Not sure what exactly you mean. Is "== FH_TTY" a random selection? I 
traced (again) that during setup of cygwin there are 80 fhandler objects 
created. Only one of them matches this criteria (and none the others, 
e.g. "== FH_CONIO". So I made a guess, and as I said, it works, kind of...
> Do we really care about console mode that much now that mintty is the
> default?

Maybe not, but the fact that it works partially but subsequent
characters are postponed resembles the other problem that I have just reported, which makes me wonder whether there is one common problem.

Also when I originally tweaked the mouse code, I couldn't completely 
understand the code in (only got it to work by pattern 
matching code...). I did notice, however, that select and read were 
inconsistent in the sense that an application having called select() 
with a positive response may not be able to get a byte with a subsequent 
read(), because criteria were re-evaluated and could have different 
results (esp. in border cases). I did fix it by strictly applying the 
same guard routine for both cases, but only for the mouse code branch.


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