getnetent, getnetbyname, getnetbyaddr, setnetent, endnetent: získat vstup do sítě

Originální popis anglicky: getnetent, getnetbyname, getnetbyaddr, setnetent, endnetent - get network entry

Návod, kniha: Linux Programmer's Manual

STRUČNĚ

#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);

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.

NÁVRATOVÁ HODNOTA

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

ODPOVÍDAJÍCÍ

BSD 4.3

SOUVISEJÍCÍ

getprotoent(3), getservent(3), networks(5)

RFC 1101

1993-05-15