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setnetent (3)
GETNETENT(3) Linux Programmer's Manual GETNETENT(3)
NAME
getnetent, getnetbyname, getnetbyaddr, setnetent, endnetent - get net-
work 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/net-
works 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 endnetent() 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 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
4.3BSD, POSIX.1-2001.
SEE ALSO
getprotoent(3), getservent(3), networks(5)
RFC 1101
GNU 1993-05-15 GETNETENT(3)
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