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NetBSD 6.1.5 - man page for getnetent (netbsd section 3)

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

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

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <netdb.h>

     struct netent *
     getnetent();

     struct netent *
     getnetbyname(const char *name);

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

     setnetent(int stayopen);

     endnetent();

DESCRIPTION
     The getnetent(), getnetbyname(), and getnetbyaddr() functions each return a pointer to an
     object with the following structure containing the broken-out fields of a line in the net-
     work data base as described in networks(5).

	   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 alternative 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 encoun-
     tered.  Network numbers are supplied in host order.

FILES
     /etc/networks

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

SEE ALSO
     networks(5), nsswitch.conf(5)

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 functions overwrite it.  Only Internet net-
     work numbers are currently understood.  Expecting network numbers to fit in no more than 32
     bits is probably naive.

BSD					   May 8, 2004					      BSD


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