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ISBN : 978-2-7460-9712-4
EAN : 9782746097124
(Editions ENI)

GNU/Linux

CentOS 4.8

i386

getnetbyaddr(3)


GETNETENT

GETNETENT

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
FILES
CONFORMING TO
SEE ALSO

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



getnetbyaddr(3)