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-.\"     $OpenBSD: getnetent.3,v 1.19 2019/08/30 20:20:51 jmc Exp $
-.\"
-.\" Copyright (c) 1983, 1991, 1993
-.\"     The Regents of the University of California.  All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\" 3. Neither the name of the University nor the names of its contributors
-.\"    may be used to endorse or promote products derived from this software
-.\"    without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.Dd $Mdocdate: August 30 2019 $
-.Dt GETNETENT 3
-.Os
-.Sh NAME
-.Nm getnetent ,
-.Nm getnetbyaddr ,
-.Nm getnetbyname ,
-.Nm setnetent ,
-.Nm endnetent
-.Nd get network entry
-.Sh SYNOPSIS
-.In netdb.h
-.Ft struct netent *
-.Fn getnetent "void"
-.Ft struct netent *
-.Fn getnetbyname "const char *name"
-.Ft struct netent *
-.Fn getnetbyaddr "in_addr_t net" "int type"
-.Ft void
-.Fn setnetent "int stayopen"
-.Ft void
-.Fn endnetent "void"
-.Sh DESCRIPTION
-The
-.Fn getnetbyname
-and
-.Fn getnetbyaddr
-functions return a pointer to an object with the following structure:
-.Bd -literal -offset indent
-struct  netent {
-        char            *n_name;        /* official name of net */
-        char            **n_aliases;    /* alias list */
-        int             n_addrtype;     /* net number type */
-        in_addr_t       n_net;          /* net number */
-};
-.Ed
-.Pp
-The members of this structure are:
-.Bl -tag -width n_addrtype
-.It Fa n_name
-The official name of the network.
-.It Fa n_aliases
-A null-terminated list of alternate names for the network.
-.It Fa n_addrtype
-The type of the network number returned; it is always
-.Dv AF_INET .
-.It Fa n_net
-The network number.
-Network numbers are returned in machine byte order.
-.El
-.Pp
-On
-.Ox ,
-these legacy functions perform a lookup in a similar fashion as
-.Xr gethostbyname 3
-and
-.Xr gethostbyaddr 3 ,
-respectively.
-On other systems, they may use a separate network database file,
-.Pa /etc/networks .
-.Pp
-In contrast to
-.Xr gethostbyaddr 3 ,
-the
-.Fa net
-argument is expected in machine byte order.
-.Pp
-The
-.Fn setnetent ,
-.Fn getnetent ,
-and
-.Fn endnetent
-functions are deprecated and no longer have any effect.
-They could be used in the past to iterate over entries in the former file
-.Pa /etc/networks .
-.Sh RETURN VALUES
-The
-.Fn getnetbyaddr
-and
-.Fn getnetbyname
-functions return
-.Dv NULL
-if the requested entry is not found.
-.Pp
-The
-.Fn getnetent
-function always returns
-.Dv NULL .
-.Sh FILES
-.Bl -tag -width /etc/hosts -compact
-.It Pa /etc/hosts
-The local host and network name database.
-.El
-.Sh SEE ALSO
-.Xr getaddrinfo 3 ,
-.Xr gethostbyname 3 ,
-.Xr getnameinfo 3 ,
-.Xr res_init 3 ,
-.Xr hosts 5
-.Sh STANDARDS
-These functions conform to
-.St -p1003.1-2008 .
-.Sh HISTORY
-The
-.Fn getnetent ,
-.Fn getnetbyaddr ,
-.Fn getnetbyname ,
-.Fn setnetent ,
-and
-.Fn endnetent
-functions appeared in
-.Bx 4.2 .
-.Sh 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 network numbers are currently understood.
-Expecting network numbers to fit in no more than 32 bits is naive.