Question about getaddrinfo in Inet4AddressImpl.c

[Charles Lee]

On 10/26/2011 04:30 PM, Alan Bateman wrote:
> On 26/10/2011 08:47, Charles Lee wrote:
>> But I do not get getaddrinfo is ipv6 specified. Do I miss sth?
> If I recall correctly, when the support for IPv6 was added (predates 
> OpenJDK as it was jdk1.4, as in 10 years ago) then 
> getaddrinfo/getnameinfo/etc. wasn't not widely supported and if I 
> think was part of the RFC that defined the socket extensions for IPv6. 
> I don't think this code has changed too much since then and probably 
> could do with a clean-up. That said, I would be surprised if there are 
> platforms that don't have gethostbyname/gethostbyaddr and their 
> reentrant forms. I'm curious as to the background to this thread, are 
> you porting to some platform that doesn't have the legacy 
> gethostbyname/gethostbyaddr or just auditing the use of the system and 
> library calls?
>
> -Alan
>

/>>> I don't think this code has changed too much since then and 
probably could do with a clean-up./
Not true. Below are some snippet I get from my ubuntu and openSolaris 
man page:
Ubuntu:

    The gethostbyname*() and gethostbyaddr*() functions are obsolete. 
    Applications should use getaddrinfo(3) and getnameinfo(3) instead.

openSolaris:

    These functions have been superseded by getipnodebyname(3SOCKET),
    getipnodebyaddr(3SOCKET), and getaddrinfo(3SOCKET),  which  provide
    greater portability to
    applications when multithreading is performed  or  technolo-
    gies  such  as  IPv6  are  used.

It shows that getaddrinfo now is the suggested native api. And from 
http://pubs.opengroup.org/onlinepubs/9699919799/ , you will get:

    The obsolescent/h_errno/external integer, and the
    obsolescent/gethostbyaddr/()
    <http://pubs.opengroup.org/onlinepubs/9699919799/functions/gethostbyaddr.html>,
    and/gethostbyname/()
    <http://pubs.opengroup.org/onlinepubs/9699919799/functions/gethostbyname.html>functions
    are removed, along with the HOST_NOT_FOUND, NO_DATA, NO_RECOVERY,
    and TRY_AGAIN macros.

Since openjdk may have its minium support platform, I believe it is 
always welcome to the new things.

/>>> are you porting to some platform
/Yes. We are trying our best to make our patches easy to be accepted by 
the community. gethostbyaddr and gethostbyname do support on our 
platform but with very different parameters. It is so lucky that 
getaddrinfo are the suggested method and common in at least three 
platforms: linux, openSolaris and our platform :-)
/
/

-- 
Yours Charles

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