[Caml-list] unix domain sockets on windows

[Caml-list] unix domain sockets on windows

[Johannes Kanig]

Hello,

I wonder if unix domain sockets are supposed to be supported on
Windows? Here is a session with the ocaml toplevel (4.01.0) on my
Windows machine:

# #load "unix.cma";;
# Unix.socket Unix.PF_UNIX Unix.SOCK_STREAM 0;;
Exception: Unix.Unix_error (Unix.EUNKNOWNERR 0, "socket", "").

Is that expected? Replacing PF_UNIX with PF_INET works.

On a related note, the "error message" provided by the unix module is
a bit funny:

# Unix.handle_unix_error (Unix.socket Unix.PF_UNIX Unix.SOCK_STREAM) 0;;
C:\OCaml\bin\ocaml.exe: "socket" failed: The operation completed successfully.

Thanks in advance,

Johannes
-- 
Johannes Kanig

Re: [Caml-list] unix domain sockets on windows

[Romain Bardou]

Hi Johannes!

According to:

http://caml.inria.fr/pub/docs/manual-ocaml/libunix.html

PF_UNIX is not supported on Windows:

"the domains PF_UNIX and PF_INET6 are not supported; PF_INET is fully
supported"

Cheers,

-- 
Romain Bardou

On 19/02/2014 09:43, Johannes Kanig wrote:
> Hello,
> 
> I wonder if unix domain sockets are supposed to be supported on
> Windows? Here is a session with the ocaml toplevel (4.01.0) on my
> Windows machine:
> 
> # #load "unix.cma";;
> # Unix.socket Unix.PF_UNIX Unix.SOCK_STREAM 0;;
> Exception: Unix.Unix_error (Unix.EUNKNOWNERR 0, "socket", "").
> 
> Is that expected? Replacing PF_UNIX with PF_INET works.
> 
> On a related note, the "error message" provided by the unix module is
> a bit funny:
> 
> # Unix.handle_unix_error (Unix.socket Unix.PF_UNIX Unix.SOCK_STREAM) 0;;
> C:\OCaml\bin\ocaml.exe: "socket" failed: The operation completed successfully.
> 
> Thanks in advance,
> 
> Johannes
> 

Re: [Caml-list] unix domain sockets on windows

[Gerd Stolpmann]

[-- Attachment #1: Type: text/plain, Size: 1780 bytes --]

Am Mittwoch, den 19.02.2014, 09:43 +0100 schrieb Johannes Kanig:
> Hello,
> 
> I wonder if unix domain sockets are supposed to be supported on
> Windows? Here is a session with the ocaml toplevel (4.01.0) on my
> Windows machine:
> 
> # #load "unix.cma";;
> # Unix.socket Unix.PF_UNIX Unix.SOCK_STREAM 0;;
> Exception: Unix.Unix_error (Unix.EUNKNOWNERR 0, "socket", "").
> 
> Is that expected? Replacing PF_UNIX with PF_INET works.

There are no Unix-domain sockets on Windows.

If you need local sockets, there are two possibilities:

1) Use Internet sockets on the loopback device (127.0.0.1)

2) Use named pipes, which work in a similar way as sockets, but have a
quite different API (btw, "named pipes" on Windows are fundamentally
different to "named pipes" on Unix). There are bindings for these in
Ocamlnet (Netsys_win32 module,
http://projects.camlcity.org/projects/dl/ocamlnet-3.7.3/doc/html-main/Netsys_win32.html).

In any case, I'd recommend you read some background knowledge about the
possibilities of the OS, because there are some hidden traps.

Gerd

> On a related note, the "error message" provided by the unix module is
> a bit funny:
> 
> # Unix.handle_unix_error (Unix.socket Unix.PF_UNIX Unix.SOCK_STREAM) 0;;
> C:\OCaml\bin\ocaml.exe: "socket" failed: The operation completed successfully.
> 
> Thanks in advance,
> 
> Johannes
> -- 
> Johannes Kanig
> 

-- 
------------------------------------------------------------
Gerd Stolpmann, Darmstadt, Germany    gerd@gerd-stolpmann.de
My OCaml site:          http://www.camlcity.org
Contact details:        http://www.camlcity.org/contact.html
Company homepage:       http://www.gerd-stolpmann.de
------------------------------------------------------------


[-- Attachment #2: This is a digitally signed message part --]
[-- Type: application/pgp-signature, Size: 490 bytes --]