[PATCH] on lease/pid-file for udhcpd/c

[Mats Erik Andersson]

Hello all,
        
        I was getting annoyed at the reluctance of udhcpd to
        volontarily update its lease file when a new lease has
        been granted. The attached patch introduces a configuration
        entry for Busybox 1.6.0 to write a new copy of the lease
        file immediately when it has sent DHCPACK.
        
        It took me some time to figure it out, but starting with
        Busybox 1.6.0 there is a new entry FEATURE_PIDFILE, which when
        forgotten causes udhcpc to complain about missing pidfile as
        soon as one tries to release the device. To avoid that serious
        malfunction I strongly suggest an addition to
        networking/udhcp/Config.in:
        
           config APP_UDHCPC
             ...
                select FEATURE_PIDFILE
        
        
        The attached diff-file is bold enough to take care of
        both matters.
        
        Best regards,   Mats E A
        
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