The
getnetent(),
getnetbyname(), and
getnetbyaddr() functions each return a pointer to an object with the following structure containing the broken-out fields of a line in the network data base as described in
networks(5).
struct netent {
char *n_name; /* official name of net */
char **n_aliases; /* alias list */
int n_addrtype; /* net number type */
uint32_t n_net; /* net number */
};
The members of this structure are:
n_name
The official name of the network.
n_aliases
A zero terminated list of alternative names for the network.
n_addrtype
The type of the network number returned; currently only AF_INET.
n_net
The network number. Network numbers are returned in machine byte order.
The
getnetent() function reads the next line of the file, opening the file if necessary.
The
setnetent() function opens and rewinds the file. If the
stayopen flag is non-zero, the net data base will not be closed after each call to
getnetbyname() or
getnetbyaddr().
The
endnetent() function closes the file.
The
getnetbyname() function and
getnetbyaddr() sequentially search from the beginning of the file until a matching net name or net address and type is found, or until
EOF is encountered. Network numbers are supplied in host order.