ws2_32: Implement a basic synchronous TransmitFile.

[Erich E. Hoover]

On Tue, Oct 20, 2015 at 6:41 PM, Hugh McMaster
<hugh.mcmaster at outlook.com> wrote:
> Hi Erich,
>
> When checking another Wine component, I noticed build warnings for dlls/ws2_32/socket.c.
>
> The relevant commit is 4d081f36efefd3ccf702cacea4d20c5616cfbae1, which was your patch, so I thought I'd let you know.
>
> socket.c: In function ‘WS2_TransmitFile’:
> socket.c:2826:46: warning: ‘iosb.Information’ may be used uninitialized in this function [-Wmaybe-uninitialized]
>                  wsa->write.iovec[0].iov_len  = iosb.Information;
>                                               ^
> socket.c:2808:25: note: ‘iosb.Information’ was declared here
>          IO_STATUS_BLOCK iosb;
>                          ^
>
> Adding    iosb.Information = 0    before    status = WS2_ReadFile( wsa->file, &iosb, wsa->buffer, bytes_per_send );
> fixes the warning, but I have no idea if that is correct for for ws2_32.

Yeah, I noticed that earlier this evening while rebasing my async
patch.  I probably did a bad rebase at some point and ended up
dropping the initialization, you can find the updated async patch here
(where it's explicitly initialized to zero):
http://source.winehq.org/patches/data/115554

Best,
Erich