1 .\" Copyright (c) 1983, 1991, 1993
2 .\" The Regents of the University of California. All rights reserved.
4 .\" Redistribution and use in source and binary forms, with or without
5 .\" modification, are permitted provided that the following conditions
7 .\" 1. Redistributions of source code must retain the above copyright
8 .\" notice, this list of conditions and the following disclaimer.
9 .\" 2. Redistributions in binary form must reproduce the above copyright
10 .\" notice, this list of conditions and the following disclaimer in the
11 .\" documentation and/or other materials provided with the distribution.
12 .\" 4. Neither the name of the University nor the names of its contributors
13 .\" may be used to endorse or promote products derived from this software
14 .\" without specific prior written permission.
16 .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
17 .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
20 .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 .\" @(#)getnetent.3 8.1 (Berkeley) 6/4/93
29 .\" $FreeBSD: src/lib/libc/net/getnetent.3,v 1.23 2007/01/09 00:28:02 imp Exp $
30 .\" $DragonFly: src/lib/libc/net/getnetent.3,v 1.2 2003/06/17 04:26:44 dillon Exp $
49 .Fn getnetbyname "const char *name"
51 .Fn getnetbyaddr "uint32_t net" "int type"
53 .Fn setnetent "int stayopen"
63 each return a pointer to an object with the
64 following structure describing an internet network.
65 This structure contains either the information obtained
68 broken-out fields of a line in the network data base
70 or entries supplied by the
73 The order of the lookups is controlled by the
76 .Bd -literal -offset indent
78 char *n_name; /* official name of net */
79 char **n_aliases; /* alias list */
80 int n_addrtype; /* net number type */
81 uint32_t n_net; /* net number */
85 The members of this structure are:
86 .Bl -tag -width n_addrtype
88 The official name of the network.
90 A zero terminated list of alternate names for the network.
92 The type of the network number returned; currently only AF_INET.
95 Network numbers are returned in machine byte
102 reads the next line of the file, opening the file if necessary.
107 opens and rewinds the file.
111 the net data base will not be closed after each call to
126 sequentially search from the beginning
127 of the file until a matching
129 net address and type is found,
138 Network numbers are supplied in host order.
140 .Bl -tag -width /etc/nsswitch.conf -compact
142 .It Pa /etc/nsswitch.conf
143 .It Pa /etc/resolv.conf
162 functions appeared in
165 The data space used by
166 these functions is thread-specific; if future use requires the data, it should be
167 copied before any subsequent calls to these functions overwrite it.
168 Only Internet network
169 numbers are currently understood.
170 Expecting network numbers to fit
171 in no more than 32 bits is probably