getifaddrs support for rtems?

[Keith Robertson]

Ralf Corsepius wrote:
> On Fri, 2007-09-14 at 17:18 +0100, Keith Robertson wrote:
>> Joel Sherrill wrote:
>>> Keith Robertson wrote:
>>>> Hi.
>>>>
>>>> http://www.rtems.com/ml/rtems-users/2006/december/thrd1.html#00142
>>>>
>>>> indicates this has been asked before, and there appears to be some 
>>>> sort of a (AFAIK somewhat involved) work around using the SIOCGIFADDR 
>>>> ioctl.
>>>>
>>>> However, most unixes these days seem to have this function and a few 
>>>> related ones (getifaddrs freeifaddrs if_nametoindex if_indextoname 
>>>> if_nameindex if_freenameindex).
>>>>
>>>> On linux, these appear to be provided by glibc.  As newlib only 
>>>> provides the core libc routines, it understandably doesn't appear to 
>>>> provide these.  To improve the clean portability of other applications 
>>>> to rtems, I'd like to find a way to implement these.   Where would 
>>>> rtems typically obtain such helper routines?  Write them ourselves?  
>>>> From somewhere in the *Bsd sources?  Elsewhere?
>>>>
>>>>   
>>> The BSD sources are always the best starting point.   From there,
>>> all I can say is use the opengroup  description and write it yourself.
>> Stupid question: the freebsd man pages have entries for getifaddrs and 
>> similar, however, I can't find it mentioned anywhere on lxr for freebsd 
>> at: http://fxr.watson.org  For linux, this makes sense, as it's provided 
>> by glibc, however, who would provide this for freebsd?
> Their libc - They all are there.
> 
> Check out the freebsd source tree from their CVS and you'll find them.

Good news.  I've been able to add getifaddrs, if_nameindex, if_indextoname.

The original sources were taken from the freebsd tree and I only needed 
to make very minor modifications (commented out a few freebsd related 
header files).

Diff is attached that includes build support, ifaddrs.h and a minor diff 
to net/if.h to add declarations for a few of the functions.

I've not added if_nametoindex as it depends on other functions that 
rtems didn't (appear) to have.  Specifically, _socket, _close, and 
_ioctl.  I've not had the time yet to investigate the relationship 
between the underscore variants and the normal ones.

I'll send a patch to network demos later today.

Comments?

Keith
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