2004-11-03 13:51:07 +00:00
|
|
|
.\" Copyright 1993 David Metcalfe (david@prism.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.\" manual page may be incorrect or out-of-date.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 (faith@cs.unc.edu)
|
|
|
|
.TH GETNETENT 3 1993-05-15 "BSD" "Linux Programmer's Manual"
|
|
|
|
.SH NAME
|
|
|
|
getnetent, getnetbyname, getnetbyaddr, setnetent, endnetent \-
|
|
|
|
get network entry
|
|
|
|
.SH SYNOPSIS
|
|
|
|
.nf
|
|
|
|
.B #include <netdb.h>
|
|
|
|
.sp
|
|
|
|
.B struct netent *getnetent(void);
|
|
|
|
.sp
|
|
|
|
.BI "struct netent *getnetbyname(const char *" name );
|
|
|
|
.sp
|
|
|
|
.BI "struct netent *getnetbyaddr(long " net ", int " type );
|
|
|
|
.sp
|
|
|
|
.BI "void setnetent(int " stayopen );
|
|
|
|
.sp
|
|
|
|
.B void endnetent(void);
|
|
|
|
.fi
|
|
|
|
.SH DESCRIPTION
|
2005-10-19 07:07:02 +00:00
|
|
|
The \fBgetnetent\fP() function reads the next line from the file
|
2004-11-03 13:51:07 +00:00
|
|
|
\fI/etc/networks\fP and returns a structure \fInetent\fP containing
|
|
|
|
the broken out fields from the line. The \fI/etc/networks\fP file
|
|
|
|
is opened if necessary.
|
|
|
|
.PP
|
2005-10-19 07:07:02 +00:00
|
|
|
The \fBgetnetbyname\fP() function returns a \fInetent\fP structure
|
2004-11-03 13:51:07 +00:00
|
|
|
for the line from \fI/etc/networks\fP that matches the network
|
|
|
|
\fIname\fP.
|
|
|
|
.PP
|
2005-10-19 07:07:02 +00:00
|
|
|
The \fBgetnetbyaddr\fP() function returns a \fInetent\fP structure
|
2004-11-03 13:51:07 +00:00
|
|
|
for the line that matches the network number \fInet\fP of type
|
|
|
|
\fItype\fP.
|
|
|
|
.PP
|
2005-10-19 07:07:02 +00:00
|
|
|
The \fBsetnetent\fP() function opens and rewinds the
|
2004-11-03 13:51:07 +00:00
|
|
|
\fI/etc/networks\fP file. If \fIstayopen\fP is true (1), then the
|
2005-10-19 07:07:02 +00:00
|
|
|
file will not be closed between calls to \fBgetnetbyname\fP() and
|
|
|
|
\fBgetnetbyaddr\fP().
|
2004-11-03 13:51:07 +00:00
|
|
|
.PP
|
2005-10-19 07:07:02 +00:00
|
|
|
The \fBendnetent\fP() function closes \fI/etc/networks\fP.
|
2004-11-03 13:51:07 +00:00
|
|
|
.PP
|
|
|
|
The \fInetent\fP structure is defined in \fI<netdb.h>\fP as follows:
|
|
|
|
.sp
|
|
|
|
.RS
|
|
|
|
.nf
|
|
|
|
.ne 6
|
|
|
|
.ta 8n 16n 34n
|
|
|
|
struct netent {
|
|
|
|
char *n_name; /* official network name */
|
|
|
|
char **n_aliases; /* alias list */
|
|
|
|
int n_addrtype; /* net address type */
|
|
|
|
unsigned long int n_net; /* network number */
|
|
|
|
}
|
|
|
|
.ta
|
|
|
|
.fi
|
|
|
|
.RE
|
|
|
|
.PP
|
|
|
|
The members of the \fInetent\fP structure are:
|
|
|
|
.TP
|
|
|
|
.I n_name
|
|
|
|
The official name of the network.
|
|
|
|
.TP
|
|
|
|
.I n_aliases
|
|
|
|
A zero terminated list of alternative names for the network.
|
|
|
|
.TP
|
|
|
|
.I n_addrtype
|
|
|
|
The type of the network number; always AF_INET.
|
|
|
|
.TP
|
|
|
|
.I n_net
|
|
|
|
The network number in host byte order.
|
|
|
|
.SH "RETURN VALUE"
|
2005-10-19 07:07:02 +00:00
|
|
|
The \fBgetnetent\fP(), \fBgetnetbyname\fP() and \fBgetnetbyaddr\fP()
|
2004-11-03 13:51:07 +00:00
|
|
|
functions return the \fInetent\fP structure, or a NULL pointer if an
|
|
|
|
error occurs or the end of the file is reached.
|
|
|
|
.SH FILES
|
|
|
|
.TP
|
|
|
|
.I /etc/networks
|
|
|
|
networks database file
|
|
|
|
.SH "CONFORMING TO"
|
2006-08-03 13:57:30 +00:00
|
|
|
4.3BSD, POSIX.1-2001.
|
2004-11-03 13:51:07 +00:00
|
|
|
.SH "SEE ALSO"
|
|
|
|
.BR getprotoent (3),
|
|
|
|
.BR getservent (3),
|
|
|
|
.BR networks (5)
|
|
|
|
.br
|
2005-07-20 07:50:45 +00:00
|
|
|
RFC\ 1101
|