NAME

getnetent, getnetbyaddr, getnetbyname, setnetent, endnetent − get network entry

SYNOPSIS

#include <netdb.h>

struct netent ∗getnetent()

struct netent ∗getnetbyname(name)
char ∗name;

struct netent ∗getnetbyaddr(net, type)
long net;
int type;

setnetent(stayopen)
int stayopen;

endnetent()

DESCRIPTION

getnetent, getnetbyname, and getnetbyaddr() each return a pointer to an object with the following structure containing the broken-out fields of a line in the network data base, /etc/networks. 

structnetent {
char∗n_name;/∗ official name of net ∗/
char∗∗n_aliases;/∗ alias list ∗/
intn_addrtype;/∗ net number type ∗/
longn_net;/∗ net number ∗/
};

The members of this structure are:

n_name The official name of the network. 

n_aliases A zero terminated list of alternate 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. 

getnetent() reads the next line of the file, opening the file if necessary. 

getnetent() opens and rewinds the file.  If the stayopen flag is non-zero, the net data base will not be closed after each call to getnetent() (either directly, or indirectly through one of the other “getnet” calls). 

endnetent() closes the file. 

getnetbyname() and getnetbyaddr() sequentially search from the beginning of the file until a matching net name or net address and type is found, or until end-of-file is encountered.  Network numbers are supplied in host order. 

FILES

/etc/networks

SEE ALSO

networks(5), ypserv(8)

DIAGNOSTICS

A NULL pointer is returned on end-of-file or error. 

BUGS

All information is contained in a static area so it must be copied if it is to be saved. 

Only Internet network numbers are currently understood. 

Sun Release 4.0  —  Last change: 14 December 1987