How to get local IP-Address

["sriram_ns" <sriram_ns@netster.com>]

hi,

How to get the local ip-address of the PC from within a
program. 
The calls gethostname() + gethostbyname() are dependent on
the /etc/hosts file and this file is often not up-to-date.
What is the alternate call to find the local ip-address??
Also are there calls to find UDP and TCP FREE PORTS to be
used for UDP/TCP socket connections[i.e., as the client-port
to connect to a remote socket].

Rgds,
Sriram N.S.
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