The getnetbyaddr(), getnetbyname() and getnetent(), functions each return a pointer to a netent structure, the members of
which contain the fields of an entry in the network database.
The getnetent() function reads the next entry of the database, opening a connection to the database if necessary.
The getnetbyaddr() function searches the database from the beginning, and finds the first entry for which the address family specified by type matches the n_addrtype member and the network number net matches the n_net member, opening a connection to the database if necessary. The net
argument is the network number in host byte order.
The getnetbyname() function searches the database from the beginning and finds the first entry for which the network name specified by name matches the n_name member, opening a connection to the database if necessary.
The setnetent() function opens and rewinds the database. If the stayopen argument is non-zero, the connection to the net database will not be closed
after each call to getnetent() (either directly, or indirectly through one of the other getnet*() functions).
The endnetent() function closes the database.
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