getnetbyname man page on FreeBSD

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GETNETENT(3)		 BSD Library Functions Manual		  GETNETENT(3)

     getnetent, getnetbyaddr, getnetbyname, setnetent, endnetent — get network

     Standard C Library (libc, -lc)

     #include <netdb.h>

     struct netent *

     struct netent *
     getnetbyname(const char *name);

     struct netent *
     getnetbyaddr(uint32_t net, int type);

     setnetent(int stayopen);


     The getnetent(), getnetbyname(), and getnetbyaddr() functions each return
     a pointer to an object with the following structure describing an inter‐
     net network.  This structure contains either the information obtained
     from the nameserver, named(8), broken-out fields of a line in the network
     data base /etc/networks, or entries supplied by the yp(8) system.	The
     order of the lookups is controlled by the `networks' entry in

	   struct  netent {
		   char		   *n_name;	   /* official name of net */
		   char		   **n_aliases;	   /* alias list */
		   int		   n_addrtype;	   /* net number type */
		   uint32_t	   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

     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 argument must be
     AF_INET.  Network numbers are supplied in host order.


     Null pointer (0) returned on EOF or error.


     RFC 1101

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

     The data space used by these functions is thread-specific; if future use
     requires the data, it should be copied before any subsequent calls to
     these functions overwrite it.  Only Internet network numbers are cur‐
     rently understood.	 Expecting network numbers to fit in no more than 32
     bits is probably naive.

BSD				 June 4, 1993				   BSD

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