Skip site navigation (1)Skip section navigation (2)

FreeBSD Man Pages

Man Page or Keyword Search:
Man Architecture
Apropos Keyword Search (all sections) Output format
home | help
GETNETENT(3)	       FreeBSD Library Functions Manual		  GETNETENT(3)

NAME
     getnetent,	getnetbyaddr, getnetbyname, setnetent, endnetent -- get	net-
     work entry

LIBRARY
     Standard C	Library	(libc, -lc)

SYNOPSIS
     #include <netdb.h>

     struct netent *
     getnetent(void);

     struct netent *
     getnetbyname(const	char *name);

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

     void
     setnetent(int stayopen);

     void
     endnetent(void);

DESCRIPTION
     The getnetent(), getnetbyname(), and getnetbyaddr() functions each	return
     a pointer to an object with the following structure containing the	bro-
     ken-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.

     The getnetent() function reads the	next line of the file, opening the
     file if necessary.

     The setnetent() function opens and	rewinds	the file.  If the stayopen
     flag is non-zero, the net data base will not be closed after each call to
     getnetbyname() or getnetbyaddr().

     The endnetent() function closes the file.

     The getnetbyname()	function 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.  The type must	be AF_INET.
     Network numbers are supplied in host order.

FILES
     /etc/networks

DIAGNOSTICS
     Null pointer (0) returned on EOF or error.

SEE ALSO
     networks(5)

     RFC 1101

HISTORY
     The getnetent(), getnetbyaddr(), getnetbyname(), setnetent(), and
     endnetent() functions appeared in 4.2BSD.

BUGS
     The data space used by these functions is static; if future use requires
     the data, it should be copied before any subsequent calls to these	func-
     tions overwrite it.  Only Internet	network	numbers	are currently under-
     stood.  Expecting network numbers to fit in no more than 32 bits is prob-
     ably naive.

FreeBSD	9.3			 June 4, 1993			   FreeBSD 9.3

NAME | LIBRARY | SYNOPSIS | DESCRIPTION | FILES | DIAGNOSTICS | SEE ALSO | HISTORY | BUGS

Want to link to this manual page? Use this URL:
<http://www.freebsd.org/cgi/man.cgi?query=getnetbyname&sektion=3&manpath=FreeBSD+4.5-RELEASE>

home | help