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Re: [Qemu-devel] Make 9pfs buildable for Windows

From: Paolo Bonzini
Subject: Re: [Qemu-devel] Make 9pfs buildable for Windows
Date: Mon, 6 Nov 2017 16:36:23 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.4.0

On 06/11/2017 16:14, Michael Fritscher wrote:
> The main thing was the question whether to make a sort of "hack" to
> emulate the *at commands (which is the way used by the patch, the main
> idea using /proc/<pid>/fd information) or make a 9pfs_local_windows
> variant which uses the native ntdll api. Which is ... another style of
> codeing, let me say it this way...

Yeah, that's expected.

> To get an idea I've attached the "main" code with my experiments to open
> the directory. The main question is: Is this kind of code ok? Sadly it
> seems the only way to access the ntdll's function, which in turn is the
> only way to have *at aquivalents.

Just one note, it's probably better to use UTF-8 for the codepage instead
of CP_ACP:

    MultiByteToWideChar(CP_ACP, 0, relative, -1, filename_WIDECHAR, 
    RtlInitUnicodeStringStruct(&filename_UNICODE, filename_WIDECHAR);

> Yes, the code is a bit dirty (very WIP). Additionally, I seem to destroy
> the stack, because after running this function qemu exists. Fixing this is
> my next step.

For what it's worth, the Wine code for kernel32 (see
might be of some help.

> NT_OPEN_FILE NtOpenFileStruct;


static NT_OPEN_FILE p_NtOpenFile;


> Best regards,
> Michael Fritscher

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