NAME
getnetent, getnetbyname, getnetbyaddr, setnetent, endnetent
- get network entry
SYNOPSIS
#include <netdb.h>
struct netent *getnetent(void);
struct netent *getnetbyname(const char *name));
struct netent *getnetbyaddr(long net, int type));
void setnetent(int stayopen));
void endnetent(void);
DESCRIPTION
The getnetent() function reads the next line from the file
/etc/networks and returns a structure netent containing the
broken out fields from the line. The /etc/networks file is
opened if necessary.
The getnetbyname() function returns a netent structure for
the line from /etc/networks that matches the network name.
The getnetbyaddr() function returns a netent structure for
the line that matches the network number net of type type.
The setnetent() function opens and rewinds the /etc/networks
file. If stayopen is true (1), then the file will not be
closed between calls to getnetbyname() and getnetbyaddr().
The endservent() function closes /etc/networks.
The netent structure is defined in <netdb.h> as follows:
struct netent {
char *n_name; /* official network name */
char **n_aliases; /* alias list */
int n_addrtype; /* net address type */
unsigned long int n_net; /* network number */
}
The members of the netent 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; always AF_INET.
n_net
The network number in host byte order.
RETURN VALUE
The getnetent(), getnetbyname() and getnetbyaddr() functions
return the netent structure, or a NULL pointer if an error
occurs or the end of the file is reached.
FILES
/etc/networks networks database file
CONFORMING TO
BSD 4.3
SEE ALSO
getprotoent(3), getservent(3), networks(5)
RFC 1101