GETNETENT
NAME SYNOPSIS DESCRIPTION RETURN VALUE FILES CONFORMING TO SEE ALSO
getnetent, getnetbyname, getnetbyaddr, setnetent, endnetent - get network entry
#include 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 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) RFC 1101
One page links to getnetbyaddr(3):
