Date: Mon, 16 Sep 2002 11:43:15 +0800 From: Leslie Jackson <int@softhome.net> To: freebsd-hackers@freebsd.org Subject: ioctl & SIOCDIFADDR Message-ID: <20020916114315.7feb4bac.int@softhome.net>
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I just want to use ioctl() to change IP address of a spcified interface.
By using ktrace(and kdump), i've found that 'ifconfig' command first uses
SIOCDIFADDR to delete an IP and then uses SIOCAIFADDR to make a aliase
(this way a new IP is assigned).
And from the man page of netintro:
-------------------------------------------------------------------------------
SIOCDIFADDR: [sniped]
and also adopts the convention that specification of the
default address means to delete the first address for the
interface belonging to the address family in which the
original socket was opened.
-------------------------------------------------------------------------------
I can specify an specific IP, say, "192.168.0.2", for SIOCDIFADDR to delete.
But how can i specify this "default address"(said in the netintor(4)) to
"delete the first address of the interface"?
Thanks in advance.
--
Leslie Jackson
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