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+.\"     $OpenBSD: getnetent.3,v 1.5 1998/03/16 05:06:56 millert 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. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"     This product includes software developed by the University of
+.\"     California, Berkeley and its contributors.
+.\" 4. 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 March 13, 1997
+.Dt GETNETENT 3
+.Os
+.Sh NAME
+.Nm getnetent ,
+.Nm getnetbyaddr ,
+.Nm getnetbyname ,
+.Nm setnetent ,
+.Nm endnetent
+.Nd get network entry
+.Sh SYNOPSIS
+.Fd #include <netdb.h>
+.Ft struct netent *
+.Fn getnetent 
+.Ft struct netent *
+.Fn getnetbyname "char *name"
+.Ft struct netent *
+.Fn getnetbyaddr "in_addr_t net" "int type"
+.Fn setnetent "int stayopen"
+.Fn endnetent 
+.Sh DESCRIPTION
+The
+.Fn getnetent ,
+.Fn getnetbyname ,
+and
+.Fn getnetbyaddr
+functions
+each return a pointer to an object with the
+following structure
+containing the broken-out
+fields of a line in the network data base,
+.Pa /etc/networks .
+.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 zero terminated list of alternate names for the network.
+.It Fa n_addrtype
+The type of the network number returned; currently only AF_INET.
+.It Fa n_net
+The network number.  Network numbers are returned in machine byte
+order.
+.El
+.Pp
+The
+.Fn getnetent
+function
+reads the next line of the file, opening the file if necessary.
+.Pp
+The
+.Fn setnetent
+function
+opens and rewinds the file.  If the
+.Fa stayopen
+flag is non-zero,
+the net data base will not be closed after each call to 
+.Fn getnetbyname
+or
+.Fn getnetbyaddr .
+.Pp
+The
+.Fn endnetent
+function
+closes the file.
+.Pp
+The
+.Fn getnetbyname
+function
+and
+.Fn getnetbyaddr
+search the domain name server if the system is configured to use one.
+If the search fails, or no name server is configured, they sequentially
+search from the beginning of the file until a matching net name or
+net address and type is found, or until
+.Dv EOF
+is encountered.
+Network numbers are supplied in host order.
+.Sh FILES
+.Bl -tag -width /etc/networks -compact
+.It Pa /etc/networks
+.El
+.Sh DIAGNOSTICS
+Null pointer
+(0) returned on
+.Dv EOF
+or error.
+.Sh SEE ALSO
+.Xr networks 5 ,
+.Xr resolver 3
+.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.