getnetent, getnetbyname, getnetbyaddr, setnetent, endnetent — get network entry
#include <netdb.h>
struct netent
*getnetent( |
void); |
struct netent
*getnetbyname( |
const char *name); |
struct netent
*getnetbyaddr( |
uint32_t net, |
int type); |
void
setnetent( |
int stayopen); |
void
endnetent( |
void); |
The getnetent() function
reads the next entry from the networks database and returns a
netent structure containing
the broken-out fields from the entry. A connection is opened
to the database if necessary.
The getnetbyname() function
returns a netent structure
for the entry from the database that matches the network
name.
The getnetbyaddr() function
returns a netent structure
for the entry from the database that matches the network
number net of type
type. The net argument must be in host
byte order.
The setnetent() function
opens a connection to the database, and sets the next entry
to the first entry. If stayopen is nonzero, then the
connection to the database will not be closed between calls
to one of the getnet*()
functions.
The endnetent() function
closes the connection to the database.
The netent structure is
defined in <netdb.h> as
follows:
struct netent { char * n_name;char ** n_aliases;int n_addrtype;uint32_t n_net;};
The members of the netent structure are:
n_nameThe official name of the network.
n_aliasesA NULL-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 a pointer
to a statically allocated netent structure, or a null pointer if an
error occurs or the end of the file is reached.
For an explanation of the terms used in this section, see attributes(7).
| Interface | Attribute | Value |
getnetent() |
Thread safety |
MT-Unsafe race:netent race:netentbuf env locale |
getnetbyname() |
Thread safety |
MT-Unsafe race:netbyname env locale |
getnetbyaddr() |
Thread safety |
MT-Unsafe race:netbyaddr locale |
|
|
Thread safety |
MT-Unsafe race:netent env locale |
In the above table, netent
in race:netent
signifies that if any of the functions setnetent(3), getnetent(3), or endnetent(3) are used in
parallel in different threads of a program, then data races
could occur.
This page is part of release 4.07 of the Linux man-pages project. A
description of the project, information about reporting bugs,
and the latest version of this page, can be found at
https://www.kernel.org/doc/man−pages/.
|
Copyright 1993 David Metcalfe (davidprism.demon.co.uk) %%%LICENSE_START(VERBATIM) 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. %%%LICENSE_END 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) |