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Getting local IP / MAC address

Hi,

Possibly this is not the best list to ask, but still, would appreciate
if some one could help.

Is there any portable / standard way to get the local IP & MAC address
in a C program (in user space)? I heard ioctl "SIOCGIFADDR" is a way,
but is is portable (read dependable)?

Also would it provide me only IP address. Any way of getting MAC address?

Thanks,

Dan

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