contrib: DHCP network monitor and fallback from DHCP to static address

[Arnout Vandecappelle]

Chris Johns wrote:
> Arnout Vandecappelle wrote:
>>  Hoi,
>>
>>  My colleague Maarten and I have developed an extension to the DHCP
>> client which allows monitoring the network interface and restarting DHCP
>> when the network changes.
[snip]
> Why was the nfs_diskless_valid code removed ?
 Because it is useless as it is (nfs_diskless_valid is never set in the
existing code, and is not exported in any header; it's historical in the
bsdnet code and has been copied blindly into the DHCP client code).  In
addition, if anyone would ever set nfs_diskless_valid to one, the
do_dhcp_timeout wouldn't work anymore...

> The rtems_bsdnet_do_dhcp change is wrong. You need to obtain the
> network semaphore after the timeout not release it.
 Ouch.  Good observation.

> Why the changes in bootp_subr.c with the order of the calls to ifioctl ?
 Oops.  Fall-out from trying to re-configure the interface without
de-configuring it first.  Slipped through my minimal-change filter. 
Shouldn't make any difference, though.

 The last two issues are removed in the attached patch.  However, this
has not been tested at all because I don't have access to the board
anymore...

 Regards,
 Arnout

-- 
Arnout Vandecappelle                     arnout at mind be
Senior Embedded Software Architect       +32-16-286540
Mind Embedded Development (an Essensium division)

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