Re: delscreen problem with ncurses 6.4

[Thomas Dickey]

On Mon, Sep 18, 2023 at 04:12:17PM +0000, Frédéric BOITEUX wrote:
>       Hello,
> 
> I've recently upgraded a server from Debian 11 to Debian 12, and rebuilt an 
> application using ncurses on it, using now Debian package in version 6.4-4, 
> instead of 6.2+20201114-2+deb11u1 with previous system version.
> 
> I've rebuilt the application, without problem, but now I'm facing memory 
> error (going to a core dump).
> This application uses multiple terminal, using newterm() / delscreen() calls. 
> It can work correctly with some terminals, but as soon as one is closed 
> (using delscreen() ), all other ones can't work anymore : trying to access to 
> any of their windows lead to a crash !

hmm - offhand, the only program I've used with multiple terminals (test/ditto)
wouldn't have run into this problem.

It seemed like a good idea at the time (will amend that):

20220813
        + modify delscreen to more effectively delete all windows on the given
          screen.
        + amend portability note for delwin in manual page.
        + adapt test/test_delwin.c from example by Bill Gray.
        + account for prescreen data if freeing leaks in pthread-configuration
        + split-out _nc_set_read_thread(), to reduce compiler warnings about
          pthread_self(), which may/may not be a weak symbol.
        + improve pthread-configuration for test/worm.c
 
 
> I've looked at the code, and rebuilt the library with « trace » mode, adding 
> some more traces, and it seems that the window list walked by delscreen is a 
> global one, instead of each screen having a specific one : this latter 
> behavior seems to be activated only when compiling with --enable-term-driver, 
> used on MinGW platform but not on Linux Debian .
> 
>   Do you have some clues to help me resolve this problem ?

...aside from waiting for an updated library, no (actually I'm starting
to consider where to cut-off for the next release).

-- 
Thomas E. Dickey <dickey@invisible-island.net>
https://invisible-island.net

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