getnetent, getnetbyname, getnetbyaddr, setnetent, endnetent — get network entry
#include <netdb.h>
struct netent *getnetent( |
void); |
struct netent *getnetbyname( |
const char * | name); |
struct netent *getnetbyaddr( |
long | net, |
| int | type); |
void
setnetent( |
int | stayopen); |
void
endnetent( |
void); |
The getnetent() function
reads the next line from the file /etc/networks and returns a structure
netent containing the broken
out fields from the line. The /etc/networks file is opened if
necessary.
The getnetbyname() function
returns a netent structure
for the line from /etc/networks
that matches the network name.
The getnetbyaddr() function
returns a netent structure
for the line that matches the network number net of type type.
The setnetent() function
opens and rewinds the /etc/networks file. If stayopen is true (1), then the
file will not be closed between calls to getnetbyname() and getnetbyaddr().
The endnetent() function
closes /etc/networks.
The netent structure is
defined in <netdb.h> as
follows:
struct netent { char * n_name;char ** n_aliases;int n_addrtype;unsigned long n_net;};
The members of the netent structure are:
n_nameThe official name of the network.
n_aliasesA zero terminated list of alternative names for the network.
n_addrtypeThe type of the network number; always AF_INET.
n_netThe network number in host byte order.
The getnetent(),
getnetbyname() and getnetbyaddr() functions return the
netent structure, or a NULL
pointer if an error occurs or the end of the file is
reached.
This page is part of release 2.79 of the Linux man-pages project. A
description of the project, and information about reporting
bugs, can be found at
http://www.kernel.org/doc/man-pages/.
|
Copyright 1993 David Metcalfe (davidprism.demon.co.uk) Permission is granted to make and distribute verbatim copies of this manual provided the copyright notice and this permission notice are preserved on all copies. Permission is granted to copy and distribute modified versions of this manual under the conditions for verbatim copying, provided that the entire resulting derived work is distributed under the terms of a permission notice identical to this one. Since the Linux kernel and libraries are constantly changing, this manual page may be incorrect or out-of-date. The author(s) assume no responsibility for errors or omissions, or for damages resulting from the use of the information contained herein. The author(s) may not have taken the same level of care in the production of this manual, which is licensed free of charge, as they might when working professionally. Formatted or processed versions of this manual, if unaccompanied by the source, must acknowledge the copyright and authors of this work. References consulted: Linux libc source code Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991) 386BSD man pages Modified Sat Jul 24 21:48:06 1993 by Rik Faith (faithcs.unc.edu) |