[cffi-devel] [johan at riise-data.no: Re: using defcenum keywords in function call]

[Johan Ur Riise]

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Subject: Re: [cffi-devel] using defcenum keywords in function call
Date: Sat, 26 Sep 2009 07:09:49 +0200
From: Johan Ur Riise <johan at riise-data.no>
To: Stelian Ionescu <sionescu at cddr.org>

On Sat, Sep 26, 2009 at 05:19:15AM +0200, Stelian Ionescu wrote:
> 
> DEFCENUM doesn't define constants(as in C), but a type which gets
> translated to integers if you specify it as argument type. In other
> words, this is correct:
> 
> (defcfun ("socket" win-socket) socket
>   "Creates a socket with the overlapped mode as default"
>   (af       af)
>   (type     sock-type)
>   (protocol pf))
> 

Thanks, that worked, and I can see now that the curl example shows how to do it.

For the record, this definition has a better chance of actually returning a socket:

(defcenum af
  :af-unspec
  :af-unix
  :af-inet)

(defcenum sock-type
  (:sock-stream 1)
  :sock-dgram
  :sock-raw)

(defcenum proto
  (:tcp 6)
  (:udp 17))

(defun make-socket ()
  (foreign-funcall "socket" 
                   af :af-inet 
                   sock-type :sock-stream 
                   proto :tcp 
                   socket))

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