AF_HYPERV address family not supported

AF_HYPERV address family not supported

[Biswapriyo Nath]

Here is the sample code that I've tried.

#include <sys/socket.h>
#include <stdio.h>
#include <errno.h>

#ifndef AF_HYPERV
#define AF_HYPERV 34
#endif

int main(void)
{
int s = socket(AF_HYPERV, SOCK_STREAM, 0);
   if (s > 0)
       printf("success\n");
   else
       printf("%s\n", strerror(errno));
}

Is this by-design? Or am I doing anything wrong?

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Re: AF_HYPERV address family not supported

[Brian Inglis]

On 2019-07-04 11:23, Biswapriyo Nath wrote:
> Here is the sample code that I've tried.
> 
> #include <sys/socket.h>
> #include <stdio.h>
> #include <errno.h>
> 
> #ifndef AF_HYPERV
> #define AF_HYPERV 34
> #endif
> 
> int main(void)
> {
> int s = socket(AF_HYPERV, SOCK_STREAM, 0);
>    if (s > 0)
>        printf("success\n");
>    else
>        printf("%s\n", strerror(errno));
> }
> 
> Is this by-design? Or am I doing anything wrong?

That's a Windows API - the Linux equivalent is AF_VSOCK: please feel free to
submit support patches to cygwin-patches to support AF_VSOCK using AF_HYPERV or
newlib to support AF_VSOCK.

	https://cygwin.com/acronyms/#SHTDI

You could check to see if the Windows oriented mingw or msys projects support
AF_HYPERV yet.

These interfaces are fairly new and OS specific so there is not yet a facility
abstraction to support.

-- 
Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada

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Re: AF_HYPERV address family not supported

[Biswapriyo Nath]

Can anyone provide a function calls between cygwin socket() and Windows
socket() as a flowchart? For example, with AF_INET.

In source code (fhandler_socket_inet::socket), I see bunch of function
pointers which seems confusing to me.

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Re: AF_HYPERV address family not supported

[Brian Inglis]

On 2019-07-10 12:41, Biswapriyo Nath wrote:
> Can anyone provide a function calls between cygwin socket() and Windows
> socket() as a flowchart? For example, with AF_INET.
> 
> In source code (fhandler_socket_inet::socket), I see bunch of function
> pointers which seems confusing to me.

Most underlying socket handling is asynchronous, event driven, so you might want
to try strace'ing to files some simple uses of Cygwin non-interactive net
utilities e.g bind-utils dig/delv/host/nslookup, inetutils ftp, nc/6, ping/6, or
whatever you have installed that accesses the net.

-- 
Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada

This email may be disturbing to some readers as it contains
too much technical detail. Reader discretion is advised.

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