if_nametoindex, if_indextoname - mappings between network interface names and indexes
The if_nametoindex() function returns the index of
the network interface corresponding to the name
The if_indextoname() function returns the name of
the network interface corresponding to the interface index
ifindex. The name is placed in the buffer pointed to by
ifname. The buffer must allow for the storage of at least
POSIX.1-2001, POSIX.1-2008, RFC 3493.
This function first appeared in BSDi.
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