Consoles in Wine
Consoles
Written by &name-eric-pouech; &email-eric-pouech
As described in the Wine User Guide's CUI section, Wine
manipulates three kinds of "consoles" in order to support
properly the Win32 CUI API.
The following table describes the main implementation
differences between the three approaches.
Function consoles implementation comparison
Function
Bare streams
Wineconsole & user backend
Wineconsole & curses backend
Console as a Win32 Object (and associated
handles)
No specific Win32 object is used in this case. The
handles manipulated for the standard Win32 streams
are in fact "bare handles" to their corresponding
Unix streams. The mode manipulation functions
(GetConsoleMode /
SetConsoleMode) are not
supported.
Implemented in server, and a specific Winelib
program (wineconsole) is in charge of the
rendering and user input. The mode manipulation
functions behave as expected.
Implemented in server, and a specific Winelib
program (wineconsole) is in charge of the
rendering and user input. The mode manipulation
functions behave as expected.
Inheritance (including handling in
CreateProcess of
CREATE_DETACHED,
CREATE_NEW_CONSOLE flags).
Not supported. Every process child of a process
will inherit the Unix streams, so will also
inherit the Win32 standard streams.
Fully supported (each new console creation will be
handled by the creation of a new USER32 window)
Fully supported, except for the creation of a new
console, which will be rendered on the same Unix
terminal as the previous one, leading to
unpredictable results.
ReadFile / WriteFile operations
Fully supported
Fully supported
Fully supported
Screen-buffer manipulation (creation, deletion, resizing...)
Not supported
Fully supported
Partly supported (this won't work too well as we
don't control (so far) the size of underlying Unix
terminal
APIs for reading/writing screen-buffer content,
cursor position
Not supported
Fully supported
Fully supported
APIs for manipulating the rendering window size
Not supported
Fully supported
Partly supported (this won't work too well as we
don't control (so far) the size of underlying Unix
terminal
Signaling (in particular, Ctrl-C handling)
Nothing is done, which means that Ctrl-C will
generate (as usual) a SIGINT
which will terminate the program.
Partly supported (Ctrl-C behaves as expected,
however the other Win32 CUI signaling isn't
properly implemented).
Partly supported (Ctrl-C behaves as expected,
however the other Win32 CUI signaling isn't
properly implemented).
Console creation
The Win32 objects behind a console can be created in several occasions:
When the program is started from wineconsole, a new
console object is created and will be used (inherited)
by the process launched from wineconsole.
When a program, which isn't attached to a console, calls
AllocConsole, Wine then launches
wineconsole, and attaches the current program to this
console. In this mode, the USER32 mode is always
selected as Wine cannot tell the current state of the
Unix console.
Please also note, that starting a child process with the
CREATE_NEW_CONSOLE flag, will end-up
calling AllocConsole in the child
process, hence creating a wineconsole with the USER32 backend.