Re: Hello! I'm guile newbie. getsockopt problem on OSX.

[Mark H Weaver]

Park SungMin <address@hidden> writes:

> I used guile 2.0.11 on Mac OSX.
> but, I find this problem..
>
>
> (use-modules (system foreign)
>            (rnrs bytevectors))
>
> (define sock (socket AF_INET SOCK_DGRAM 0))
>
> (getsockopt sock SOL_SOCKET SO_SNDBUF) ;;=> 140733193397248 ???
>
>
> so…I use C function directly…
>
> ;;; 
> (define foreign-getsockopt
>   (pointer->procedure int (dynamic-func "getsockopt" (dynamic-link))
>                     (list int int int '* '*)))
>
> (define ret-value (sint-list->bytevector '(0) (native-endianness) 4))
> (define size-value (sint-list->bytevector '(4) (native-endianness) 4))
>
> (foreign-getsockopt (port->fdes sock) SOL_SOCKET SO_SNDBUF 
> (bytevector->pointer ret-value)
>                   (bytevector->pointer size-value))
>
> (bytevector->sint-list  ret-value (native-endianness) 4) ;;=> 9216. It's 
> right!
>
>
> is it bug of getsockopt??

Thanks for the report.  Note that address@hidden is the preferred
place to send bug reports.

It is indeed a bug, going back to 2001.  The code assumed that for the
SO_SNDBUF and SO_RCVBUF options, the argument was of type 'size_t', when
in fact both the Linux and POSIX documentation indicates that the
argument is of type 'int'.

Fixed in e94a42c7f05d4b816dcb62c139dd65291a11dd78, which will be in
2.0.12.

     Thanks!
       Mark