83 lines
2.6 KiB
Plaintext
83 lines
2.6 KiB
Plaintext
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Console - First Pass
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--------------------
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Consoles are just xterms created with the -Sxxn switch.
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A pty is opened and the master goes to the xterm side
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and the slave is held by the wine side. The console
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itself it turned into a few HANDLE32s and is set
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to the STD_*_HANDLES.
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It is possible to use the WriteFile and ReadFile commands
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to write to a win32 console. To accomplish this, all K32OBJs
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that support I/O have a read and write function pointer.
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So, WriteFile calls K32OBJ_WriteFile which calls the K32OBJ's
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write function pointer, which then finally calls write.
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[this paragraph is now out of date]
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If the command line console is to be inheirited or
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a process inherits it's parents console (-- can that happen???),
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the console is created at process init time via PROCESS_InheritConsole.
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The 0, 1, and 2 file descriptors are duped to be the
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STD_*_HANDLES in this case. Also in this case a flag is set
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to indicate that the console comes from the parent process or
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command line.
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If a process doesn't have a console at all, it's
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pdb->console is set to NULL. This helps indicate when
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it is possible to create a new console (via AllocConsole).
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When FreeConsole is called, all handles that the process has
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open to the console are closed. Like most k32objs, if the
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console's refcount reaches zero, its k32obj destroy function
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is called. The destroy kills the xterm if one was open.
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Also like most k32 objects, we assume that (K32OBJ) header is the
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first field so the casting (from K32OBJ *to CONSOLE *)
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works correctly.
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FreeConsole is called on process exit (in ExitProcess) if
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pdb->console is not NULL.
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BUGS
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----
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Console processes do not inherit their parent's handles. I think
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there needs to be two cases, one where they have to inherit
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the stdin/stdout/stderr from unix, and one where they have to
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inherit from another windows app.
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================================================================
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experimentation with NT4 yields that:
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WriteFile
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---------
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o does not truncate file on 0 length write
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o 0 length write or error on write changes numcharswritten to 0
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o 0 length write returns TRUE
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o works with console handles
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_lwrite
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-------
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o does truncate/expand file at current position on 0 length write
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o returns 0 on a zero length write
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o works with console handles (typecasted)
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WriteConsole
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------------
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o expects only console handles
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SetFilePointer
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--------------
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o returns -1 (err 6) when used with a console handle
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FreeConsole
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-----------
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o even when all the handles to it are freed, the win32 console
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stays visible, the only way I could find to free it
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was via the FreeConsole
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