GETNETENT(3N)															     GETNETENT(3N)

NAME

       getnetent, getnetbyaddr, getnetbyname, setnetent, endnetent - get network entry

SYNOPSIS

       #include <netdb.h>

       struct netent *getnetent()

       struct netent *getnetbyname(name)
       char *name;

       struct netent *getnetbyaddr(net, type)
       long net;
       int type;

       setnetent(stayopen)
       int stayopen;

       endnetent()

DESCRIPTION

       Getnetent,  getnetbyname, and getnetbyaddr each return a pointer to an object with the following structure containing the broken-out fields
       of a line in the network data base, /etc/networks.

	      struct	netent {
		   char      *n_name;  /* official name of net */
		   char      **n_aliases;   /* alias list */
		   int	     n_addrtype;    /* net number type */
		   unsigned long  n_net;	 /* net number */
	      };

       The members of this structure are:

       n_name	   The official name of the network.

       n_aliases   A zero terminated list of alternate names for the network.

       n_addrtype  The type of the network number returned; currently only AF_INET.

       n_net	   The network number.	Network numbers are returned in machine byte order.

       Getnetent reads the next line of the file, opening the file if necessary.

       Setnetent opens and rewinds the file.  If the stayopen flag is non-zero, the net data base will not be closed after each call to  getnetby-
       name or getnetbyaddr.

       Endnetent closes the file.

       Getnetbyname  and  getnetbyaddr	sequentially  search  from  the beginning of the file until a matching net name or net address and type is
       found, or until EOF is encountered.  Network numbers are supplied in host order.

FILES

       /etc/networks

SEE ALSO

       networks(5)

DIAGNOSTICS

       Null pointer(0) returned on EOF or error.

BUGS

       All information is contained in a static area so it must be copied if it is to be saved.   Only	Internet  network  numbers  are  currently
       understood.  Expecting network numbers to fit in no more than 32 bits is probably naive.

4.2 Berkeley Distribution					   May 19, 1986 						     GETNETENT(3N)