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

[Gerd Stolpmann <info@gerd-stolpmann.de>]

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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
> 

-- 
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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
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