Re: [PATCH v3 01/14] mingw: add network-wrappers for daemon

[Eric Sunshine <ericsunshine@gmail.com>]

On 10/10/2010 9:20 AM, Erik Faye-Lund wrote:
> From: Mike Pape<dotzenlabs@gmail.com>
>
> git-daemon requires some socket-functionality that is not yet
> supported in the Windows-port. This patch adds said functionality,
> and makes sure WSAStartup gets called by socket(), since it is the
> first network-call in git-daemon. In addition, a check is added to
> prevent WSAStartup (and WSACleanup, though atexit) from being
> called more than once, since git-daemon calls both socket() and
> gethostbyname().
>
> Signed-off-by: Mike Pape<dotzenlabs@gmail.com>
> Signed-off-by: Erik Faye-Lund<kusmabite@gmail.com>
> ---
> diff --git a/compat/mingw.c b/compat/mingw.c
> index 6590f33..563ef1f 100644
> --- a/compat/mingw.c
> +++ b/compat/mingw.c
> +#undef accept
> +int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
> +{
> +	int sockfd2;
> +
> +	SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
> +	SOCKET s2 = accept(s1, sa, sz);
> +
> +	/* convert into a file descriptor */
> +	if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY))<  0) {
> +		closesocket(s2);
> +		return error("unable to make a socket file descriptor: %s",
> +			strerror(errno));

Is 'errno' from _open_osfhandle() still valid when handed to strerror() 
or has it been clobbered by closesocket()?

Corollary: Does _open_osfhandle() indeed set 'errno', or is it more 
appropriate to call WSAGetLastError()? (The documentation I read for 
_open_osfhandle() did not say anything about how to determine the reason 
for failure.)

-- ES