|n_name||The official name of the network.|
|n_aliases||A zero terminated list of alternate names for the network.|
|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. The type argument must be AF_INET. Network numbers are supplied in host order.
Null pointer returned on EOF or error.
The getnetent, getnetbyaddr, getnetbyname, setnetent, and endnetent functions appeared in BSD 4.2 .
The data space used by these functions is thread-specific; if future use requires the data, it should be copied before any subsequent calls to these functions overwrite it. Only Internet network numbers are currently understood. Expecting network numbers to fit in no more than 32 bits is probably naive.