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>GETNETENT(3)            System Library Functions Manual           GETNETENT(3)
 
NAME
     getnetent, getnetbyaddr, getnetbyname, setnetent, endnetent - get network
     entry
 
SYNOPSIS
     #include &lt;netdb.h&#62;
 
     struct netent *
     getnetent(void);
 
     struct netent *
     getnetbyname(char *name);
 
     struct netent *
     getnetbyaddr(in_addr_t net, int type);
 
     void
     setnetent(int stayopen);
 
     void
     endnetent(void);
 
DESCRIPTION
     The getnetent(), getnetbyname(), and getnetbyaddr() functions each return
     a pointer to an object with the following structure containing the bro-
     ken-out fields of a line in the network database, /etc/networks.
 
           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 */
           };
 
     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
                 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 database will not be closed after each call to
     getnetbyname() or getnetbyaddr().
 
     The endnetent() function closes the file.
 
     The getnetbyname() and getnetbyaddr() functions 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 EOF is encountered.  Network numbers are supplied in host order.
 
FILES
     /etc/networks
 
DIAGNOSTICS
     Null pointer (0) returned on EOF or error.
 
SEE ALSO
     resolver(3), networks(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 func-
     tions overwrite it.  Only Internet network numbers are currently under-
     stood.  Expecting network numbers to fit in no more than 32 bits is
     naive.
 
BSD                             March 13, 1997                             BSD
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1	28	unneback	`<!-- Copyright (C) 2003 Red Hat, Inc. -->`
2			`<!-- This material may be distributed only subject to the terms -->`
3			`<!-- and conditions set forth in the Open Publication License, v1.0 -->`
4			`<!-- or later (the latest version is presently available at -->`
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85			`NAME="NET-COMMON-TCPIP-MANPAGES-GETNETENT">getnetent</H1`
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93			`CLASS="SCREEN"`
94			`>GETNETENT(3) System Library Functions Manual GETNETENT(3)`
95
96			`NAME`
97			`getnetent, getnetbyaddr, getnetbyname, setnetent, endnetent - get network`
98			`entry`
99
100			`SYNOPSIS`
101			`#include <netdb.h>`
102
103			`struct netent *`
104			`getnetent(void);`
105
106			`struct netent *`
107			`getnetbyname(char *name);`
108
109			`struct netent *`
110			`getnetbyaddr(in_addr_t net, int type);`
111
112			`void`
113			`setnetent(int stayopen);`
114
115			`void`
116			`endnetent(void);`
117
118			`DESCRIPTION`
119			`The getnetent(), getnetbyname(), and getnetbyaddr() functions each return`
120			`a pointer to an object with the following structure containing the bro-`
121			`ken-out fields of a line in the network database, /etc/networks.`
122
123			`struct netent {`
124			`char n_name; / official name of net */`
125			`char *n_aliases; / alias list */`
126			`int n_addrtype; /* net number type */`
127			`in_addr_t n_net; /* net number */`
128			`};`
129
130			`The members of this structure are:`
131
132			`n_name The official name of the network.`
133
134			`n_aliases A zero-terminated list of alternate names for the network.`
135
136			`n_addrtype The type of the network number returned; currently only`
137			`AF_INET.`
138
139			`n_net The network number. Network numbers are returned in machine`
140			`byte order.`
141
142			`The getnetent() function reads the next line of the file, opening the`
143			`file if necessary.`
144
145			`The setnetent() function opens and rewinds the file. If the stayopen`
146			`flag is non-zero, the net database will not be closed after each call to`
147			`getnetbyname() or getnetbyaddr().`
148
149			`The endnetent() function closes the file.`
150
151			`The getnetbyname() and getnetbyaddr() functions search the domain name`
152			`server if the system is configured to use one. If the search fails, or`
153			`no name server is configured, they sequentially search from the beginning`
154			`of the file until a matching net name or net address and type is found,`
155			`or until EOF is encountered. Network numbers are supplied in host order.`
156
157			`FILES`
158			`/etc/networks`
159
160			`DIAGNOSTICS`
161			`Null pointer (0) returned on EOF or error.`
162
163			`SEE ALSO`
164			`resolver(3), networks(5)`
165
166			`HISTORY`
167			`The getnetent(), getnetbyaddr(), getnetbyname(), setnetent(), and`
168			`endnetent() functions appeared in 4.2BSD.`
169
170			`BUGS`
171			`The data space used by these functions is static; if future use requires`
172			`the data, it should be copied before any subsequent calls to these func-`
173			`tions overwrite it. Only Internet network numbers are currently under-`
174			`stood. Expecting network numbers to fit in no more than 32 bits is`
175			`naive.`
176
177			`BSD March 13, 1997 BSD`
178			`</PRE`
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