redhat man page for getnetent

GETNETENT(3)						     Linux Programmer's Manual						      GETNETENT(3)

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

BSD
								    1993-05-15							      GETNETENT(3)