Table of Contentsgetnetent, getnetbyname, getnetbyaddr, setnetent, endnetent - get network entry #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.
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. /etc/networks networks database file BSD 4.3 getprotoent(3), getservent(3), networks(5)
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